TY - JOUR T1 - Edge reactivity and water-assisted dissociation on cobalt oxide nanoislands. AN - 1862936949; 28134335 AB - Transition metal oxides show great promise as Earth-abundant catalysts for the oxygen evolution reaction in electrochemical water splitting. However, progress in the development of highly active oxide nanostructures is hampered by a lack of knowledge of the location and nature of the active sites. Here we show, through atom-resolved scanning tunnelling microscopy, X-ray spectroscopy and computational modelling, how hydroxyls form from water dissociation at under coordinated cobalt edge sites of cobalt oxide nanoislands. Surprisingly, we find that an additional water molecule acts to promote all the elementary steps of the dissociation process and subsequent hydrogen migration, revealing the important assisting role of a water molecule in its own dissociation process on a metal oxide. Inspired by the experimental findings, we theoretically model the oxygen evolution reaction activity of cobalt oxide nanoislands and show that the nanoparticle metal edges also display favourable adsorption energetics for water oxidation under electrochemical conditions. JF - Nature communications AU - Fester, J AU - García-Melchor, M AU - Walton, A S AU - Bajdich, M AU - Li, Z AU - Lammich, L AU - Vojvodic, A AU - Lauritsen, J V AD - Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Aarhus C, Denmark. ; Chemical Engineering and SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94025, USA. ; School of Chemistry, University of Manchester, Manchester M13 9PL, UK. ; Department of Physics and Astronomy, Institute for Storage Ring Facilities, Aarhus, DK-8000 Aarhus C, Denmark. ; Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street 311A Towne Building Philadelphia Pennsylvania, 19104, USA. Y1 - 2017/01/30/ PY - 2017 DA - 2017 Jan 30 SP - 14169 VL - 8 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1862936949?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+communications&rft.atitle=Edge+reactivity+and+water-assisted+dissociation+on+cobalt+oxide+nanoislands.&rft.au=Fester%2C+J%3BGarc%C3%ADa-Melchor%2C+M%3BWalton%2C+A+S%3BBajdich%2C+M%3BLi%2C+Z%3BLammich%2C+L%3BVojvodic%2C+A%3BLauritsen%2C+J+V&rft.aulast=Fester&rft.aufirst=J&rft.date=2017-01-30&rft.volume=8&rft.issue=&rft.spage=14169&rft.isbn=&rft.btitle=&rft.title=Nature+communications&rft.issn=2041-1723&rft_id=info:doi/10.1038%2Fncomms14169 LA - English DB - ProQuest Environmental Science Collection N1 - Date created - 2017-01-30 N1 - Date revised - 2017-02-28 N1 - SuppNotes - Cited By: Science. 2011 Dec 9;334(6061):1383-5 [22033519] Nat Chem. 2014 Apr;6(4):362-7 [24651205] J Am Chem Soc. 2011 Apr 13;133(14):5587-93 [21413705] ChemSusChem. 2011 Nov 18;4(11):1566-9 [21997965] ACS Nano. 2015 Aug 25;9(8):7804-14 [26027877] Phys Rev Lett. 1996 Oct 28;77(18):3865-3868 [10062328] Nat Commun. 2014 Jun 30;5:4193 [24979078] Phys Chem Chem Phys. 2014 Jul 21;16(27):13682-8 [24671166] Nat Commun. 2014 Jul 17;5:4477 [25030209] Science. 2016 Apr 15;352(6283):333-7 [27013427] J Am Chem Soc. 2008 Mar 5;130(9):2793-7 [18257559] Phys Rev B Condens Matter. 1993 Jan 1;47(1):558-561 [10004490] Science. 2014 Sep 26;345(6204):1599-602 [25190716] Nat Mater. 2012 May 06;11(6):550-7 [22561903] J Am Chem Soc. 2014 Nov 26;136(47):16481-4 [25380057] Angew Chem Int Ed Engl. 2004 Dec 10;43(48):6642-5 [15593168] Nat Nanotechnol. 2014 Jan;9(1):69-73 [24336404] ACS Nano. 2015 Mar 24;9(3):2445-53 [25693621] Phys Chem Chem Phys. 2013 Oct 28;15(40):17460-7 [24026021] J Am Chem Soc. 2003 Mar 5;125(9):2746-55 [12603164] ACS Nano. 2013 Nov 26;7(11):10233-44 [24111487] J Am Chem Soc. 2013 Sep 11;135(36):13521-30 [23944254] J Am Chem Soc. 2012 Oct 17;134(41):17253-61 [22991896] Nat Chem. 2011 Jan;3(1):79-84 [21160522] J Phys Chem Lett. 2015 Oct 15;6(20):4178-83 [26722794] Science. 2012 May 18;336(6083):889-93 [22605771] ChemSusChem. 2012 May;5(5):871-8 [22162485] Conflict of Interest: The authors declare no competing financial interests. N1 - Last updated - 2017-02-28 DO - http://dx.doi.org/10.1038/ncomms14169 ER - TY - JOUR T1 - Phase Separation of Dirac Electrons in Topological Insulators at the Spatial Limit. AN - 1853740596; 28026959 AB - In this work we present unique signatures manifested by the local electronic properties of the topological surface state in Bi2Te3 nanostructures as the spatial limit is approached. We concentrate on the pure nanoscale limit (nanoplatelets) with spatial electronic resolution down to 1 nm. The highlights include strong dependencies on nanoplatelet size: (1) observation of a phase separation of Dirac electrons whose length scale decreases as the spatial limit is approached, and (2) the evolution from heavily n-type to lightly n-type surface doping as nanoplatelet thickness increases. Our results show a new approach to tune the Dirac point together with reduction of electronic disorder in topological insulator (TI) nanostructured systems. We expect our work will provide a new route for application of these nanostructured Dirac systems in electronic devices. JF - Nano letters AU - Parra, Carolina AU - Rodrigues da Cunha, Thiago Henrique AU - Contryman, Alex W AU - Kong, Desheng AU - Montero-Silva, Francisco AU - Rezende Gonçalves, Pedro Henrique AU - Dos Reis, Diogo Duarte AU - Giraldo-Gallo, Paula AU - Segura, Rodrigo AU - Olivares, Fernanda AU - Niestemski, Francis AU - Cui, Yi AU - Magalhaes-Paniago, Rogerio AU - Manoharan, Hari C AD - Laboratorio Nanobiomateriales, Departamento de Física, Universidad Técnica Federico Santa María , Avenida España, 1680, Valparaíso, Chile. ; CTNanotubos, Universidade Federal de Minas Gerais , Rua Professor José Vieira de Mendonça 1.000, Engenho Nogueira, BH, Brazil. ; Department of Applied Physics, Stanford University , Stanford, California 94305, United States. ; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States. ; Departamento de Física, Universidade Federal de Minas Gerais , CP 702 Belo Horizonte, MG CEP 30123-970, Brazil. ; National High Magnetic Field Laboratory , Tallahassee, Florida 32310, United States. ; Instituto de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso , Av. Gran Bretaña, 1111 Valparaíso, Chile. ; Department of Physics, Stanford University , Stanford, California 94305, United States. Y1 - 2017/01/11/ PY - 2017 DA - 2017 Jan 11 SP - 97 EP - 103 VL - 17 IS - 1 KW - scanning tunneling spectroscopy KW - Bi2Te3 KW - Topological insulator nanostructures KW - Dirac electrons KW - phase separation KW - doping UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1853740596?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nano+letters&rft.atitle=Phase+Separation+of+Dirac+Electrons+in+Topological+Insulators+at+the+Spatial+Limit.&rft.au=Parra%2C+Carolina%3BRodrigues+da+Cunha%2C+Thiago+Henrique%3BContryman%2C+Alex+W%3BKong%2C+Desheng%3BMontero-Silva%2C+Francisco%3BRezende+Gon%C3%A7alves%2C+Pedro+Henrique%3BDos+Reis%2C+Diogo+Duarte%3BGiraldo-Gallo%2C+Paula%3BSegura%2C+Rodrigo%3BOlivares%2C+Fernanda%3BNiestemski%2C+Francis%3BCui%2C+Yi%3BMagalhaes-Paniago%2C+Rogerio%3BManoharan%2C+Hari+C&rft.aulast=Parra&rft.aufirst=Carolina&rft.date=2017-01-11&rft.volume=17&rft.issue=1&rft.spage=97&rft.isbn=&rft.btitle=&rft.title=Nano+letters&rft.issn=1530-6992&rft_id=info:doi/10.1021%2Facs.nanolett.6b03506 LA - English DB - ProQuest Environmental Science Collection N1 - Date created - 2016-12-27 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1021/acs.nanolett.6b03506 ER - TY - JOUR T1 - RADIATION DOSE MEASUREMENTS FOR HIGH-INTENSITY LASER INTERACTIONS WITH SOLID TARGETS AT SLAC AN - 1868316707; PQ0004027030 AB - A systematic study of photon and neutron radiation doses generated in high-intensity laser-solid interactions is underway at SLAC National Accelerator Laboratory. These laser-solid experiments are being performed using a 25 TW (up to 1 J in 40 fs) femtosecond pulsed Ti:sapphire laser at the Linac Coherent Light Source's (LCLS) Matter in Extreme Conditions (MEC) facility. Radiation measurements were performed with passive and active detectors deployed at various locations inside and outside the target chamber. Results from radiation dose measurements for laser-solid experiments at SLAC MEC in 2014 with peak intensity between 10 super(18) and 7.1 x 10 super(19) W cm super(-2) are presented. JF - Radiation Protection Dosimetry AU - Liang, T AU - Bauer, J AU - Cimeno, M AU - Ferrari, A AU - Galtier, E AU - Granados, E AU - Lee, H J AU - Liu, J AU - Nagler, B AU - Prinz, A AU - Rokni, S AU - Tran, H AU - Woods, M AD - SLAC National Accelerator Laboratory, Menlo Park, CA, USA, tliang6@slac.stanford.edu Y1 - 2016/12// PY - 2016 DA - December 2016 SP - 346 EP - 355 PB - Oxford University Press, Great Clarendon Street Oxford OX2 6DP United Kingdom VL - 172 IS - 4 SN - 0144-8420, 0144-8420 KW - Toxicology Abstracts; Environment Abstracts KW - Radiation KW - Photons KW - Neutron radiation KW - Laboratories KW - Dosimetry KW - Radiation measurements KW - Lasers KW - Geographical variations KW - Light effects KW - X 24390:Radioactive Materials KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1868316707?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxicologyabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Radiation+Protection+Dosimetry&rft.atitle=RADIATION+DOSE+MEASUREMENTS+FOR+HIGH-INTENSITY+LASER+INTERACTIONS+WITH+SOLID+TARGETS+AT+SLAC&rft.au=Liang%2C+T%3BBauer%2C+J%3BCimeno%2C+M%3BFerrari%2C+A%3BGaltier%2C+E%3BGranados%2C+E%3BLee%2C+H+J%3BLiu%2C+J%3BNagler%2C+B%3BPrinz%2C+A%3BRokni%2C+S%3BTran%2C+H%3BWoods%2C+M&rft.aulast=Liang&rft.aufirst=T&rft.date=2016-12-01&rft.volume=172&rft.issue=4&rft.spage=346&rft.isbn=&rft.btitle=&rft.title=Radiation+Protection+Dosimetry&rft.issn=01448420&rft_id=info:doi/10.1093%2Frpd%2Fncv505 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2017-02-01 N1 - Last updated - 2017-03-01 N1 - SubjectsTermNotLitGenreText - Photons; Neutron radiation; Laboratories; Dosimetry; Lasers; Geographical variations; Light effects; Radiation; Radiation measurements DO - http://dx.doi.org/10.1093/rpd/ncv505 ER - TY - JOUR T1 - Clumped-isotope thermometry of magnesium carbonates in ultramafic rocks AN - 1861085984; 784352-13 AB - Magnesium carbonate minerals produced by reaction of H (sub 2) O-CO (sub 2) with ultramafic rocks occur in a wide range of paragenetic and tectonic settings and can thus provide insights into a variety of geologic processes, including (1) deposition of ore-grade, massive-vein cryptocrystalline magnesite; (2) formation of hydrous magnesium carbonates in weathering environments; and (3) metamorphic carbonate alteration of ultramafic rocks. However, the application of traditional geochemical and isotopic methods to infer temperatures of mineralization, the nature of mineralizing fluids, and the mechanisms controlling the transformation of dissolved CO (sub 2) into magnesium carbonates in these settings is difficult because the fluids are usually not preserved. Clumped-isotope compositions of magnesium carbonates provide a means to determine primary mineralization or (re)equilibration temperature, which permits the reconstruction of geologic processes that govern magnesium carbonate formation. We first provide an evaluation of the acid fractionation correction for magnesium carbonates using synthetic magnesite and hydromagnesite, along with natural metamorphic magnesite and low-temperature hydromagnesite precipitated within a mine adit. We show that the acid fractionation correction for magnesium carbonates is virtually indistinguishable from other carbonate acid fractionation corrections given current mass spectrometer resolution and error. In addition, we employ carbonate clumped-isotope thermometry on natural magnesium carbonates from various geologic environments and tectonic settings. Cryptocrystalline magnesite vein deposits from California (Red Mountain magnesite mine), Austria (Kraubath locality), Turkey (Tutluca mine, Eskisehir district) and Iran (Derakht-Senjed deposit) exhibit broadly uniform Delta (sub 47) compositions that yield apparent clumped-isotope temperatures that average 23.7 + or - 5.0 degrees C. Based on oxygen isotope thermometry, these clumped-isotope temperatures suggest mineralization at shallow crustal depths in the presence of meteoric water. Hydrous magnesium carbonates from a 400-km latitudinal transect along the serpentinized-peridotite bodies of the California Coast Ranges record clumped-isotope temperatures between 14.2 and 22.7 + or - 2.8 degrees C, in agreement with historical maximum temperatures during the rainy season for California. Talc-carbonate alteration of ultramafic rocks in Greenland (Isua Supracrustal Belt) and Vermont (Ludlow) yields clumped-isotope alteration temperatures of magnesite and dolomite between 326 and 490 degrees C, broadly consistent with paragenesis and thermodynamic analysis for CO (sub 2) metasomatism of ultramafic rocks. These metamorphic carbonates extend the applicability of clumped-isotope thermometry to high-temperature magnesium carbonate systems and indicate equilibrium blocking temperatures for magnesite of approximately 490 degrees C. Our study demonstrates the applicability of the clumped isotope approach to provide information on the formation of magnesium carbonates as ore resources, surface records of climate, and metamorphic assemblages. JF - Geochimica et Cosmochimica Acta AU - Garcia del Real, Pablo AU - Maher, Kate AU - Kluge, Tobias AU - Bird, Dennis K AU - Brown, Gordon E , Jr AU - John, Cedric M Y1 - 2016/11/15/ PY - 2016 DA - 2016 Nov 15 SP - 222 EP - 250 PB - Elsevier, New York, NY VL - 193 SN - 0016-7037, 0016-7037 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1861085984?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Clumped-isotope+thermometry+of+magnesium+carbonates+in+ultramafic+rocks&rft.au=Garcia+del+Real%2C+Pablo%3BMaher%2C+Kate%3BKluge%2C+Tobias%3BBird%2C+Dennis+K%3BBrown%2C+Gordon+E+%2C+Jr%3BJohn%2C+Cedric+M&rft.aulast=Garcia+del+Real&rft.aufirst=Pablo&rft.date=2016-11-15&rft.volume=193&rft.issue=&rft.spage=222&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2016.08.003 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - PubXState - NY N1 - Last updated - 2017-01-24 N1 - CODEN - GCACAK DO - http://dx.doi.org/10.1016/j.gca.2016.08.003 ER - TY - JOUR T1 - Tailoring Transition-Metal Hydroxides and Oxides by Photon-Induced Reactions. AN - 1835451529; 27754583 AB - Controlled synthesis of transition-metal hydroxides and oxides with earth-abundant elements have attracted significant interest because of their wide applications, for example as battery electrode materials or electrocatalysts for fuel generation. Here, we report the tuning of the structure of transition-metal hydroxides and oxides by controlling chemical reactions using an unfocused laser to irradiate the precursor solution. A Nd:YAG laser with wavelengths of 532 nm or 1064 nm was used. The Ni2+ , Mn2+ , and Co2+ ion-containing aqueous solution undergoes photo-induced reactions and produces hollow metal-oxide nanospheres (Ni0.18 Mn0.45 Co0.37 Ox ) or core-shell metal hydroxide nanoflowers ([Ni0.15 Mn0.15 Co0.7 (OH)2 ](NO3 )0.2 ⋅H2 O), depending on the laser wavelengths. We propose two reaction pathways, either by photo-induced redox reaction or hydrolysis reaction, which are responsible for the formation of distinct nanostructures. The study of photon-induced materials growth shines light on the rational design of complex nanostructures with advanced functionalities. JF - Angewandte Chemie (International ed. in English) AU - Niu, Kai-Yang AU - Fang, Liang AU - Ye, Rong AU - Nordlund, Dennis AU - Doeff, Marca M AU - Lin, Feng AU - Zheng, Haimei AD - Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California, 94720, USA. ; Department of Chemistry, University of California, Berkeley, CA, 94720, USA. ; Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California, 94025, USA. ; Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California, 94720, USA. ; Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California, 94720, USA. hmzheng@lbl.gov. Y1 - 2016/11/07/ PY - 2016 DA - 2016 Nov 07 SP - 14272 EP - 14276 VL - 55 IS - 46 KW - transition-metal hydroxides KW - photochemistry KW - reaction pathways KW - vibrational excitation KW - nanostructures UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1835451529?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Angewandte+Chemie+%28International+ed.+in+English%29&rft.atitle=Tailoring+Transition-Metal+Hydroxides+and+Oxides+by+Photon-Induced+Reactions.&rft.au=Niu%2C+Kai-Yang%3BFang%2C+Liang%3BYe%2C+Rong%3BNordlund%2C+Dennis%3BDoeff%2C+Marca+M%3BLin%2C+Feng%3BZheng%2C+Haimei&rft.aulast=Niu&rft.aufirst=Kai-Yang&rft.date=2016-11-07&rft.volume=55&rft.issue=46&rft.spage=14272&rft.isbn=&rft.btitle=&rft.title=Angewandte+Chemie+%28International+ed.+in+English%29&rft.issn=1521-3773&rft_id=info:doi/10.1002%2Fanie.201606775 LA - English DB - ProQuest Environmental Science Collection N1 - Date created - 2016-10-18 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1002/anie.201606775 ER - TY - JOUR T1 - Fresh-slice multicolour X-ray free-electron lasers AN - 1837303206; PQ0003811850 AB - X-ray free-electron lasers (XFELs) provide femtosecond X-ray pulses with a narrow energy bandwidth and unprecedented brightness. Ultrafast physical and chemical dynamics, initiated with a site-specific X-ray pulse, can be explored using XFELs with a second ultrashort X-ray probe pulse. However, existing double-pulse schemes are complicated, difficult to customize or provide only low-intensity pulses. Here we present the novel fresh-slice technique for multicolour pulse production, wherein different temporal slices of an electron bunch lase to saturation in separate undulator sections. This method combines electron bunch tailoring from a passive wakefield device with trajectory control to provide multicolour pulses. The fresh-slice scheme outperforms existing techniques at soft X-ray wavelengths. It produces femtosecond pulses with a power of tens of gigawatts and flexible colour separation. The pulse delay can be varied from temporal overlap to almost one picosecond. We also demonstrate the first three-colour XFEL and variably polarized two-colour pulses. JF - Nature Photonics AU - Lutman, Alberto A AU - Maxwell, Timothy J AU - MacArthur, James P AU - Guetg, Marc W AU - Berrah, Nora AU - Coffee, Ryan N AU - Ding, Yuantao AU - Huang, Zhirong AU - Marinelli, Agostino AU - Moeller, Stefan AU - Zemella, Johann CU AD - SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Y1 - 2016/11// PY - 2016 DA - November 2016 SP - 745 EP - 750 PB - Nature Publishing Group, The Macmillan Building London N1 9XW United Kingdom VL - 10 IS - 11 SN - 1749-4885, 1749-4885 KW - Biotechnology and Bioengineering Abstracts KW - Brightness KW - Ionizing radiation KW - Energy KW - Probes KW - Lasers KW - Wavelength KW - W 30900:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1837303206?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+Photonics&rft.atitle=Fresh-slice+multicolour+X-ray+free-electron+lasers&rft.au=Lutman%2C+Alberto+A%3BMaxwell%2C+Timothy+J%3BMacArthur%2C+James+P%3BGuetg%2C+Marc+W%3BBerrah%2C+Nora%3BCoffee%2C+Ryan+N%3BDing%2C+Yuantao%3BHuang%2C+Zhirong%3BMarinelli%2C+Agostino%3BMoeller%2C+Stefan%3BZemella%2C+Johann+CU&rft.aulast=Lutman&rft.aufirst=Alberto&rft.date=2016-11-01&rft.volume=10&rft.issue=11&rft.spage=745&rft.isbn=&rft.btitle=&rft.title=Nature+Photonics&rft.issn=17494885&rft_id=info:doi/10.1038%2Fnphoton.2016.201 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-11-01 N1 - Last updated - 2017-02-01 N1 - SubjectsTermNotLitGenreText - Brightness; Energy; Ionizing radiation; Probes; Lasers; Wavelength DO - http://dx.doi.org/10.1038/nphoton.2016.201 ER - TY - JOUR T1 - Pb, Cu, and Zn distributions at humic acid-coated metal oxide surfaces AN - 1815667703; 2016-076503 AB - Mineral surfaces are often coated by natural organic matter (NOM), which has a major influence on metal-ion sorption and sequestration because of the abundance of binding sites in such coatings and the changes they cause in local nanoscale environments. The effects of NOM coatings on mineral surfaces are, however, still poorly understood at the molecular level due to the complexity of these systems. In this study, we have applied long-period X-ray standing wave-fluorescence yield (LP-XSW-FY) spectroscopy to measure the partitioning of naturally present Cu(II) (0.0226%), Zn(II) (0.009%), and Pb(II) ( approximately 0.0004%) between Elliott Soil Humic Acid (ESHA) coatings and three model single-crystal metal-oxide substrates: alpha -Al (sub 2) O (sub 3) (0 0 0 1), alpha -Al (sub 2) O (sub 3) (1 -1 0 2), and alpha -Fe (sub 2) O (sub 3) (0 0 0 1). The competitive sorption effects among these metal ions for binding sites in the ESHA coatings and on the metal-oxide surfaces were investigated as a function of reaction time, calcium content, and solution pH. Pb(II) ions present in the ESHA coatings were found to redistribute to reactive alpha -Al (sub 2) O (sub 3) (1 -1 0 2) and alpha -Fe (sub 2) O (sub 3) (0 0 0 1) surfaces after 3 h of reaction (pH = 6.0, [Ca(II)] = 2 mM). Pb(II) partitioning onto these reactive metal-oxide surfaces increased with increasing reaction time (up to 7 d). In addition, the partitioning of Cu(II) and Zn(II) from the ESHA coating to the alpha -Fe (sub 2) O (sub 3) (0 0 0 1) substrate increased slightly with reaction time (2.4% and 3.7% for Cu(II) and Zn(II), respectively, after 3 h and 6.4% and 7.7% for Cu(II) and Zn(II), respectively, after 72 h of reaction time). However, no changes in the partitioning of Cu(II) and Zn(II) onto the alpha -Al (sub 2) O (sub 3) (1 -1 0 2) surface were observed with increasing reaction time, suggesting that these ions strongly complex with functional groups in the ESHA coatings. Similar results were obtained for Cu(II) and Zn(II) on the ESHA-coated alpha -Al (sub 2) O (sub 3) (1 -1 0 2) surfaces in samples without the addition of calcium. However, the amounts of Pb(II) mobilized from the ESHA coatings onto the alpha -Al (sub 2) O (sub 3) (1 -1 0 2) surfaces increased from 40% (no added Ca) to 58% (with 2 mM Ca) after 72 h of reaction time, possibly due to displacement of Pb(II) by Ca(II) from binding sites in the ESHA coatings. In contrast, Pb(II), Cu(II), and Zn(II) present in the ESHA coatings were found to be unreactive with the alpha -Al (sub 2) O (sub 3) (0 0 0 1) surface. The observed reactivities of the three ESHA-coated metal-oxide surfaces with respect to metal-ion sorption are consistent with the trend observed for the uncoated metal-oxide surfaces: alpha -Fe (sub 2) O (sub 3) (0 0 0 1) > alpha -Al (sub 2) O (sub 3) (1 -1 0 2) > alpha -Al (sub 2) O (sub 3) (0 0 0 1). In addition, Pb(II) partitioning onto alpha -Al (sub 2) O (sub 3) (1 -1 0 2) surfaces increased with increasing pH from 4.0 to 9.0 as a result of the increasingly negative surface charge. These results show that intrinsic properties (nature of binding sites, binding affinities, and surface charge) of the ESHA coatings and metal-oxide surfaces, as well as external parameters such as pH and competing ions, are key factors governing the distribution and speciation of metal ions at complex NOM/mineral interfaces. JF - Geochimica et Cosmochimica Acta AU - Wang, Yingge AU - Michel, F Marc AU - Choi, Yongseong AU - Eng, Peter J AU - Levard, Clement AU - Siebner, Hagar AU - Gu, Baohua AU - Bargar, John R AU - Brown, Gordon E, Jr Y1 - 2016/09// PY - 2016 DA - September 2016 SP - 407 EP - 423 PB - Elsevier, New York, NY VL - 188 SN - 0016-7037, 0016-7037 KW - zinc KW - copper KW - mass spectra KW - lead KW - humic acids KW - models KW - ICP mass spectra KW - partitioning KW - organic compounds KW - organic acids KW - humic substances KW - single-crystal method KW - chemical reactions KW - aluminum oxides KW - hematite KW - metals KW - X-ray fluorescence spectra KW - oxides KW - spectra KW - coatings KW - crystal chemistry KW - chemical composition KW - pH KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1815667703?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Pb%2C+Cu%2C+and+Zn+distributions+at+humic+acid-coated+metal+oxide+surfaces&rft.au=Wang%2C+Yingge%3BMichel%2C+F+Marc%3BChoi%2C+Yongseong%3BEng%2C+Peter+J%3BLevard%2C+Clement%3BSiebner%2C+Hagar%3BGu%2C+Baohua%3BBargar%2C+John+R%3BBrown%2C+Gordon+E%2C+Jr&rft.aulast=Wang&rft.aufirst=Yingge&rft.date=2016-09-01&rft.volume=188&rft.issue=&rft.spage=407&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2016.05.009 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2016-01-01 N1 - Number of references - 77 N1 - PubXState - NY N1 - Document feature - illus. incl. 3 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2016-09-01 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - aluminum oxides; chemical composition; chemical reactions; coatings; copper; crystal chemistry; hematite; humic acids; humic substances; ICP mass spectra; lead; mass spectra; metals; models; organic acids; organic compounds; oxides; partitioning; pH; single-crystal method; spectra; X-ray fluorescence spectra; zinc DO - http://dx.doi.org/10.1016/j.gca.2016.05.009 ER - TY - JOUR T1 - Effect of biofilm coatings at metal-oxide/water interfaces; I, Pb(II) and Zn(II) partitioning and speciation at Shewanella oneidensis/metal-oxide/water interfaces AN - 1815667688; 2016-076501 AB - Microbial biofilms are often present as coatings on metal-oxide surfaces in natural and industrial environments and may induce significant changes in the partitioning behavior and speciation of aqueous metal ions, which in turn can impact their transport and fate. In this study, long-period X-ray standing wave-fluorescence yield (LP-XSW-FY) spectroscopy was used to measure under in situ conditions the partitioning of aqueous Pb(II) and Zn(II) between multilayer Shewanella oneidensis MR-1 biofilms and highly polished, oriented single-crystal surfaces of alpha -Al (sub 2) O (sub 3) and alpha -Fe (sub 2) O (sub 3) as a function of metal-ion concentration and time at pH 6.0. We show that after 3-h exposure time, Pb(II) binds preferentially to the alpha -Al (sub 2) O (sub 3) (1-102) and alpha -Fe (sub 2) O (sub 3) (0 0 0 1) surfaces at low Pb concentration ([Pb] = 10 (super -7) M) and then increasingly partitions into the biofilm coatings at higher concentrations (10 (super -6) to 10 (super -4) M). In contrast, Zn(II) partitions preferentially into the biofilm coating for both surfaces at all Zn concentrations studied (10 (super -7) to 10 (super -4) M). In comparison, the alpha -Al (sub 2) O (sub 3) (0 0 0 1) surface has a low affinity for both Pb(II) and Zn(II), and the biofilm coatings are the dominant sink for both ions. These findings suggest that in the presence of S. oneidensis biofilm coatings, alpha -Al (sub 2) O (sub 3) (0 0 0 1) is the least reactive surface for Pb(II) and Zn(II) compared to alpha -Al (sub 2) O (sub 3) (1-102) and alpha -Fe (sub 2) O (sub 3) (0 0 0 1). They also show that Zn(II) has a lower affinity than Pb(II) for reactive sites on alpha -Al (sub 2) O (sub 3) (1-102) and alpha -Fe (sub 2) O (sub 3) (0 0 0 1) at [Me(II)] of 10 (super -7) M; at 10 (super -5) M, the bulk of the metal ions partition into the biofilm coatings. At longer exposure times (20-24 h), both Pb(II) and Zn(II) increasingly partition to the metal-oxide surfaces at [Me(II)] = 10 (super -5) M and pH 6.0, indicating possible reaction/diffusion-controlled sorption processes. Pb L (sub III) -edge and Zn K-edge grazing-incidence extended X-ray absorption fine structure (GI-EXAFS) measurements suggest that both Pb(II) and Zn(II) ions may be complexed by carboxyl groups in S. oneidensis biofilms after 3-h exposure at pH 6.0 and [Me(II)] = 10 (super -5) M. In contrast with Burkholderia cepacia, which was used in our previous studies of monolayer biofilm-coated metal-oxide surfaces (Templeton et al., 2001), S. oneidensis MR-1 forms relatively thick biofilm coatings (6-20 mu m) that are rich in reactive functional groups and are expected to dominate metal-ion adsorption. Our results show that even thick and highly reactive biofilms like S. oneidensis do not cause much change in the intrinsic chemical reactivities of the underlying metal-oxide surfaces with respect to aqueous Pb(II) and Zn(II) and don't block reactive sites on the metal-oxide surfaces; instead they reduce the rate of Pb(II) and Zn(II) sorption onto these surfaces. JF - Geochimica et Cosmochimica Acta AU - Wang, Yingge AU - Gelabert, Alexandre AU - Michel, F Marc AU - Choi, Yongseong AU - Gescher, Johannes AU - Ona-Nguema, Georges AU - Eng, Peter J AU - Bargar, John R AU - Farges, Francois AU - Spormann, Alfred M AU - Brown, Gordon E, Jr Y1 - 2016/09// PY - 2016 DA - September 2016 SP - 368 EP - 392 PB - Elsevier, New York, NY VL - 188 SN - 0016-7037, 0016-7037 KW - zinc KW - sorption KW - laser methods KW - iron oxides KW - lead KW - MINTEQA2 KW - laser scanning KW - Shewanella KW - remediation KW - partitioning KW - aluminum oxides KW - water-rock interaction KW - hematite KW - X-ray fluorescence spectra KW - oxides KW - spectra KW - X-ray photoelectron spectra KW - water pollution KW - kinetics KW - water KW - diffusion KW - biochemistry KW - pollution KW - bioremediation KW - biogenic processes KW - metals KW - biofilms KW - bacteria KW - EXAFS data KW - synchrotrons KW - mobilization KW - chemical fractionation KW - 22:Environmental geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1815667688?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Effect+of+biofilm+coatings+at+metal-oxide%2Fwater+interfaces%3B+I%2C+Pb%28II%29+and+Zn%28II%29+partitioning+and+speciation+at+Shewanella+oneidensis%2Fmetal-oxide%2Fwater+interfaces&rft.au=Wang%2C+Yingge%3BGelabert%2C+Alexandre%3BMichel%2C+F+Marc%3BChoi%2C+Yongseong%3BGescher%2C+Johannes%3BOna-Nguema%2C+Georges%3BEng%2C+Peter+J%3BBargar%2C+John+R%3BFarges%2C+Francois%3BSpormann%2C+Alfred+M%3BBrown%2C+Gordon+E%2C+Jr&rft.aulast=Wang&rft.aufirst=Yingge&rft.date=2016-09-01&rft.volume=188&rft.issue=&rft.spage=368&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2016.04.052 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2016-01-01 N1 - Number of references - 113 N1 - PubXState - NY N1 - Document feature - illus. incl. 6 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2016-11-17 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - aluminum oxides; bacteria; biochemistry; biofilms; biogenic processes; bioremediation; chemical fractionation; diffusion; EXAFS data; hematite; iron oxides; kinetics; laser scanning; lead; metals; MINTEQA2; mobilization; oxides; partitioning; pollution; remediation; Shewanella; sorption; spectra; synchrotrons; water; water pollution; water-rock interaction; X-ray fluorescence spectra; X-ray photoelectron spectra; zinc; laser methods DO - http://dx.doi.org/10.1016/j.gca.2016.04.052 ER - TY - JOUR T1 - Relating structure and composition with accessibility of a single catalyst particle using correlative 3-dimensional micro-spectroscopy. AN - 1815681758; 27572475 AB - To understand how hierarchically structured functional materials operate, analytical tools are needed that can reveal small structural and chemical details in large sample volumes. Often, a single method alone is not sufficient to get a complete picture of processes happening at multiple length scales. Here we present a correlative approach combining three-dimensional X-ray imaging techniques at different length scales for the analysis of metal poisoning of an individual catalyst particle. The correlative nature of the data allowed establishing a macro-pore network model that interprets metal accumulations as a resistance to mass transport and can, by tuning the effect of metal deposition, simulate the response of the network to a virtual ageing of the catalyst particle. The developed approach is generally applicable and provides an unprecedented view on dynamic changes in a material's pore space, which is an essential factor in the rational design of functional porous materials. JF - Nature communications AU - Liu, Yijin AU - Meirer, Florian AU - Krest, Courtney M AU - Webb, Samuel AU - Weckhuysen, Bert M AD - Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California, 2575 Sand Hill Road, Menlo Park, California 94025, USA. ; Inorganic Chemistry and Catalysis group, Debye Institute for Nanomaterials Science, Utrecht University, Utrecht, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands. Y1 - 2016/08/30/ PY - 2016 DA - 2016 Aug 30 SP - 12634 VL - 7 KW - Index Medicus UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1815681758?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+communications&rft.atitle=Relating+structure+and+composition+with+accessibility+of+a+single+catalyst+particle+using+correlative+3-dimensional+micro-spectroscopy.&rft.au=Liu%2C+Yijin%3BMeirer%2C+Florian%3BKrest%2C+Courtney+M%3BWebb%2C+Samuel%3BWeckhuysen%2C+Bert+M&rft.aulast=Liu&rft.aufirst=Yijin&rft.date=2016-08-30&rft.volume=7&rft.issue=&rft.spage=12634&rft.isbn=&rft.btitle=&rft.title=Nature+communications&rft.issn=2041-1723&rft_id=info:doi/10.1038%2Fncomms12634 LA - English DB - ProQuest Environmental Science Collection N1 - Date created - 2016-08-30 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/ncomms12634 ER - TY - JOUR T1 - Echo-enabled harmonics up to the 75th order from precisely tailored electron beams AN - 1811890622; PQ0003543958 AB - The production of coherent radiation at ever shorter wavelengths has been a long-standing challenge since the invention of lasers and the subsequent demonstration of frequency doubling. Modern X-ray free-electron lasers (FELs) use relativistic electrons to produce intense X-ray pulses on few-femtosecond timescales. However, the shot noise that seeds the amplification produces pulses with a noisy spectrum and limited temporal coherence. To produce stable transform-limited pulses, a seeding scheme called echo-enabled harmonic generation (EEHG) has been proposed, which harnesses the highly nonlinear phase mixing of the celebrated echo phenomenon to generate coherent harmonic density modulations in the electron beam with conventional lasers. Here, we report on a demonstration of EEHG up to the 75th harmonic, where 32nm light is produced from a 2,400nm laser. We also demonstrate that individual harmonic amplitudes are controlled by simple adjustment of the phase mixing. Results show the potential of laser-based manipulations to achieve precise control over the coherent spectrum in future X-ray FELs for new science. JF - Nature Photonics AU - Hemsing, E AU - Dunning, M AU - Garcia, B AU - Hast, C AU - Raubenheimer, T AU - Stupakov, G AU - Xiang, D AD - SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA Y1 - 2016/08// PY - 2016 DA - August 2016 SP - 512 EP - 515 PB - Nature Publishing Group, The Macmillan Building London N1 9XW United Kingdom VL - 10 IS - 8 SN - 1749-4885, 1749-4885 KW - Biotechnology and Bioengineering Abstracts KW - Seeds KW - Ionizing radiation KW - Seeding KW - Lasers KW - Wavelength KW - Light effects KW - W 30925:Genetic Engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1811890622?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+Photonics&rft.atitle=Echo-enabled+harmonics+up+to+the+75th+order+from+precisely+tailored+electron+beams&rft.au=Hemsing%2C+E%3BDunning%2C+M%3BGarcia%2C+B%3BHast%2C+C%3BRaubenheimer%2C+T%3BStupakov%2C+G%3BXiang%2C+D&rft.aulast=Hemsing&rft.aufirst=E&rft.date=2016-08-01&rft.volume=10&rft.issue=8&rft.spage=512&rft.isbn=&rft.btitle=&rft.title=Nature+Photonics&rft.issn=17494885&rft_id=info:doi/10.1038%2Fnphoton.2016.101 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-08-01 N1 - Last updated - 2016-09-01 N1 - SubjectsTermNotLitGenreText - Seeds; Ionizing radiation; Seeding; Lasers; Wavelength; Light effects DO - http://dx.doi.org/10.1038/nphoton.2016.101 ER - TY - JOUR T1 - Atomistic Interrogation of B-N Co-dopant Structures and Their Electronic Effects in Graphene. AN - 1807279940; 27327863 AB - Chemical doping has been demonstrated to be an effective method for producing high-quality, large-area graphene with controlled carrier concentrations and an atomically tailored work function. The emergent optoelectronic properties and surface reactivity of carbon nanostructures are dictated by the microstructure of atomic dopants. Co-doping of graphene with boron and nitrogen offers the possibility to further tune the electronic properties of graphene at the atomic level, potentially creating p- and n-type domains in a single carbon sheet, opening a gap between valence and conduction bands in the 2-D semimetal. Using a suite of high-resolution synchrotron-based X-ray techniques, scanning tunneling microscopy, and density functional theory based computation we visualize and characterize B-N dopant bond structures and their electronic effects at the atomic level in single-layer graphene grown on a copper substrate. We find there is a thermodynamic driving force for B and N atoms to cluster into BNC structures in graphene, rather than randomly distribute into isolated B and N graphitic dopants, although under the present growth conditions, kinetics limit segregation of large B-N domains. We observe that the doping effect of these BNC structures, which open a small band gap in graphene, follows the B:N ratio (B > N, p-type; B < N, n-type; B═N, neutral). We attribute this to the comparable electron-withdrawing and -donating effects, respectively, of individual graphitic B and N dopants, although local electrostatics also play a role in the work function change. JF - ACS nano AU - Schiros, Theanne AU - Nordlund, Dennis AU - Palova, Lucia AU - Zhao, Liuyan AU - Levendorf, Mark AU - Jaye, Cherno AU - Reichman, David AU - Park, Jiwoong AU - Hybertsen, Mark AU - Pasupathy, Abhay AD - Department of Science and Mathematics, Fashion Institute of Technology/State University of New York , New York, New York 10001, United States. ; Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States. ; Chemistry Department, Cornell University , Ithaca, New York 10065, United States. ; Materials Measurement Laboratory, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States. ; Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973, United States. Y1 - 2016/07/26/ PY - 2016 DA - 2016 Jul 26 SP - 6574 EP - 6584 VL - 10 IS - 7 KW - Index Medicus KW - scanning tunneling microscopy KW - graphene KW - chemical bonding KW - work function KW - electronic structure KW - atomic design KW - X-ray spectroscopy KW - doping UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1807279940?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=ACS+nano&rft.atitle=Atomistic+Interrogation+of+B-N+Co-dopant+Structures+and+Their+Electronic+Effects+in+Graphene.&rft.au=Schiros%2C+Theanne%3BNordlund%2C+Dennis%3BPalova%2C+Lucia%3BZhao%2C+Liuyan%3BLevendorf%2C+Mark%3BJaye%2C+Cherno%3BReichman%2C+David%3BPark%2C+Jiwoong%3BHybertsen%2C+Mark%3BPasupathy%2C+Abhay&rft.aulast=Schiros&rft.aufirst=Theanne&rft.date=2016-07-26&rft.volume=10&rft.issue=7&rft.spage=6574&rft.isbn=&rft.btitle=&rft.title=ACS+nano&rft.issn=1936-086X&rft_id=info:doi/10.1021%2Facsnano.6b01318 LA - English DB - ProQuest Environmental Science Collection N1 - Date created - 2016-07-26 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1021/acsnano.6b01318 ER - TY - JOUR T1 - Polarization control in an X-ray free-electron laser AN - 1808623018; PQ0003358017 AB - X-ray free-electron lasers are unique sources of high-brightness coherent radiation. However, existing devices supply only linearly polarized light, precluding studies of chiral dynamics. A device called the Delta undulator has been installed at the Linac Coherent Light Source (LCLS) to provide tunable polarization. With a reverse tapered planar undulator line to pre-microbunch the beam and the novel technique of beam diverting, hundreds of microjoules of circularly polarized X-ray pulses are produced at 500-1,200eV. These X-ray pulses are tens of femtoseconds long, have a degree of circular polarization of 0.98 sub(-0.04) super(+0.02) at 707eV and may be scanned in energy. We also present a new two-colour X-ray pump-X-ray probe operating mode for the LCLS. Energy differences of Delta E/E=2.4% are supported, and the second pulse can be adjusted to any elliptical polarization. In this mode, the pointing, timing, intensity and wavelength of the two pulses can be modified. JF - Nature Photonics AU - Lutman, Alberto A AU - MacArthur, James P AU - Ilchen, Markus AU - Lindahl, Anton O AU - Buck, Jens AU - Coffee, Ryan N AU - Dakovski, Georgi L AU - Dammann, Lars AU - Ding, Yuantao AU - Duerr, Hermann A AU - Glaser, Leif AU - Gruenert, Jan AU - Hartmann, Gregor AU - Hartmann, Nick AU - Higley, Daniel AU - Hirsch, Konstantin AU - Levashov, Yurii I AU - Marinelli, Agostino AU - Maxwell, Tim AU - Mitra, Ankush AU - Moeller, Stefan AU - Osipov, Timur AU - Peters, Franz AU - Planas, Marc AU - Shevchuk, Ivan AU - Schlotter, William F AU - Scholz, Frank AU - Seltmann, Jorn AU - Viefhaus, Jens AU - Walter, Peter AU - Wolf, Zachary R AU - Huang, Zhirong AU - Nuhn, Heinz-Dieter AD - SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Y1 - 2016/07// PY - 2016 DA - July 2016 SP - 468 EP - 472 PB - Nature Publishing Group, The Macmillan Building London N1 9XW United Kingdom VL - 10 IS - 7 SN - 1749-4885, 1749-4885 KW - Biotechnology and Bioengineering Abstracts KW - Ionizing radiation KW - Energy KW - Probes KW - Lasers KW - Wavelength KW - Polarization KW - Polarized light KW - Light effects KW - W 30900:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1808623018?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+Photonics&rft.atitle=Polarization+control+in+an+X-ray+free-electron+laser&rft.au=Lutman%2C+Alberto+A%3BMacArthur%2C+James+P%3BIlchen%2C+Markus%3BLindahl%2C+Anton+O%3BBuck%2C+Jens%3BCoffee%2C+Ryan+N%3BDakovski%2C+Georgi+L%3BDammann%2C+Lars%3BDing%2C+Yuantao%3BDuerr%2C+Hermann+A%3BGlaser%2C+Leif%3BGruenert%2C+Jan%3BHartmann%2C+Gregor%3BHartmann%2C+Nick%3BHigley%2C+Daniel%3BHirsch%2C+Konstantin%3BLevashov%2C+Yurii+I%3BMarinelli%2C+Agostino%3BMaxwell%2C+Tim%3BMitra%2C+Ankush%3BMoeller%2C+Stefan%3BOsipov%2C+Timur%3BPeters%2C+Franz%3BPlanas%2C+Marc%3BShevchuk%2C+Ivan%3BSchlotter%2C+William+F%3BScholz%2C+Frank%3BSeltmann%2C+Jorn%3BViefhaus%2C+Jens%3BWalter%2C+Peter%3BWolf%2C+Zachary+R%3BHuang%2C+Zhirong%3BNuhn%2C+Heinz-Dieter&rft.aulast=Lutman&rft.aufirst=Alberto&rft.date=2016-07-01&rft.volume=10&rft.issue=7&rft.spage=468&rft.isbn=&rft.btitle=&rft.title=Nature+Photonics&rft.issn=17494885&rft_id=info:doi/10.1038%2Fnphoton.2016.79 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-07-01 N1 - Last updated - 2016-08-17 N1 - SubjectsTermNotLitGenreText - Energy; Ionizing radiation; Probes; Lasers; Wavelength; Polarization; Polarized light; Light effects DO - http://dx.doi.org/10.1038/nphoton.2016.79 ER - TY - JOUR T1 - The formation mechanism for printed silver-contacts for silicon solar cells. AN - 1778707989; 27033774 AB - Screen-printing provides an economically attractive means for making Ag electrical contacts to Si solar cells, but the use of Ag substantiates a significant manufacturing cost, and the glass frit used in the paste to enable contact formation contains Pb. To achieve optimal electrical performance and to develop pastes with alternative, abundant and non-toxic materials, a better understanding the contact formation process during firing is required. Here, we use in situ X-ray diffraction during firing to reveal the reaction sequence. The findings suggest that between 500 and 650 °C PbO in the frit etches the SiNx antireflective-coating on the solar cell, exposing the Si surface. Then, above 650 °C, Ag(+) dissolves into the molten glass frit - key for enabling deposition of metallic Ag on the emitter surface and precipitation of Ag nanocrystals within the glass. Ultimately, this work clarifies contact formation mechanisms and suggests approaches for development of inexpensive, nontoxic solar cell contacting pastes. JF - Nature communications AU - Fields, Jeremy D AU - Ahmad, Md Imteyaz AU - Pool, Vanessa L AU - Yu, Jiafan AU - Van Campen, Douglas G AU - Parilla, Philip A AU - Toney, Michael F AU - van Hest, Maikel F A M AD - National Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, Colorado 80401, USA. ; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA. ; Department of Electrical Engineering, Stanford University, 350 Serra Mall, Stanford, California 94305, USA. Y1 - 2016/04/01/ PY - 2016 DA - 2016 Apr 01 SP - 11143 VL - 7 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1778707989?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+communications&rft.atitle=The+formation+mechanism+for+printed+silver-contacts+for+silicon+solar+cells.&rft.au=Fields%2C+Jeremy+D%3BAhmad%2C+Md+Imteyaz%3BPool%2C+Vanessa+L%3BYu%2C+Jiafan%3BVan+Campen%2C+Douglas+G%3BParilla%2C+Philip+A%3BToney%2C+Michael+F%3Bvan+Hest%2C+Maikel+F+A+M&rft.aulast=Fields&rft.aufirst=Jeremy&rft.date=2016-04-01&rft.volume=7&rft.issue=&rft.spage=11143&rft.isbn=&rft.btitle=&rft.title=Nature+communications&rft.issn=2041-1723&rft_id=info:doi/10.1038%2Fncomms11143 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2016-08-02 N1 - Date created - 2016-04-01 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/ncomms11143 ER - TY - JOUR T1 - Theoretical Insight into the Trends that Guide the Electrochemical Reduction of Carbon Dioxide to Formic Acid AN - 1776653886; PQ0002771696 AB - The electrochemical reduction (electroreduction) of CO sub(2) to formic acid (HCOOH) and its competing reactions, that is, the electroreduction of CO sub(2) to CO and the hydrogen evolution reaction (HER), on twenty-seven different metal surfaces have been investigated using density functional theory (DFT) calculations. Owing to a strong linear correlation between the free energies of COOH* and H*, it seems highly unlikely that the electroreduction of CO sub(2) to HCOOH via the COOH* intermediate occurs without a large fraction of the current going to HER. On the other hand, the selective electroreduction of CO sub(2) to HCOOH seems plausible if the reaction occurs via the HCOO* intermediate, as there is little correlation between the free energies of HCOO* and H*. Lead and silver surfaces are found to be the most promising monometallic catalysts showing high faradaic efficiencies for the electroreduction of CO sub(2) to HCOOH with small overpotentials. Our methodology is widely applicable, not only to metal surfaces, but also to other classes of materials enabling the computational search for electrocatalysts for CO sub(2) reduction to HCOOH. Let's make formic acid from CO sub(2)! To establish a sustainable hydrogen storage cycle using CO sub(2) as a hydrogen carrier requires suitable catalysts that can selectively produce formic acid (HCOOH) from CO sub(2). Herein, we propose strategies to find such catalysts based on analyzing the calculated thermodynamics of electrochemical reduction of CO sub(2) to HCOOH and other products competing with the hydrogen evolution reaction on various metal surfaces. JF - ChemSusChem AU - Yoo, Jong Suk AU - Christensen, Rune AU - Vegge, Tejs AU - Noerskov, Jens K AU - Studt, Felix AD - SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA. Y1 - 2016/02// PY - 2016 DA - February 2016 SP - 358 EP - 363 PB - John Wiley & Sons, Ltd., Baffins Lane Chichester W. Sussex PO19 1UD United Kingdom VL - 9 IS - 4 SN - 1864-5631, 1864-5631 KW - Sustainability Science Abstracts KW - Storage KW - Metals KW - Thermodynamics KW - Energy KW - Hydrogen KW - Catalysts KW - Carbon dioxide KW - Electrochemistry KW - Silver KW - Lead KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1776653886?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=ChemSusChem&rft.atitle=Theoretical+Insight+into+the+Trends+that+Guide+the+Electrochemical+Reduction+of+Carbon+Dioxide+to+Formic+Acid&rft.au=Yoo%2C+Jong+Suk%3BChristensen%2C+Rune%3BVegge%2C+Tejs%3BNoerskov%2C+Jens+K%3BStudt%2C+Felix&rft.aulast=Yoo&rft.aufirst=Jong&rft.date=2016-02-01&rft.volume=9&rft.issue=4&rft.spage=358&rft.isbn=&rft.btitle=&rft.title=ChemSusChem&rft.issn=18645631&rft_id=info:doi/10.1002%2Fcssc.201501197 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-03-01 N1 - Last updated - 2016-04-13 N1 - SubjectsTermNotLitGenreText - Storage; Metals; Thermodynamics; Energy; Catalysts; Hydrogen; Electrochemistry; Carbon dioxide; Silver; Lead DO - http://dx.doi.org/10.1002/cssc.201501197 ER - TY - JOUR T1 - Monitoring Ultrafast Chemical Dynamics by Time-Domain X-ray Photo- and Auger-Electron Spectroscopy. AN - 1760884679; 26641490 AB - The directed flow of charge and energy is at the heart of all chemical processes. Extraordinary efforts are underway to monitor and understand the concerted motion of electrons and nuclei with ever increasing spatial and temporal sensitivity. The element specificity, chemical sensitivity, and temporal resolution of ultrafast X-ray spectroscopy techniques hold great promise to provide new insight into the fundamental interactions underlying chemical dynamics in systems ranging from isolated molecules to application-like devices. Here, we focus on the potential of ultrafast X-ray spectroscopy techniques based on the detection of photo- and Auger electrons to provide new fundamental insight into photochemical processes of systems with various degrees of complexity. Isolated nucleobases provide an excellent testing ground for our most fundamental understanding of intramolecular coupling between electrons and nuclei beyond the traditionally applied Born-Oppenheimer approximation. Ultrafast electronic relaxation dynamics enabled by the breakdown of this approximation is the major component of the nucleobase photoprotection mechanisms. Transient X-ray induced Auger electron spectroscopy on photoexcited thymine molecules provides atomic-site specific details of the extremely efficient coupling that converts potentially bond changing ultraviolet photon energy into benign heat. In particular, the time-dependent spectral shift of a specific Auger band is sensitive to the length of a single bond within the molecule. The X-ray induced Auger transients show evidence for an electronic transition out of the initially excited state within only ∼200 fs in contrast to theoretically predicted picosecond population trapping behind a reaction barrier. Photoinduced charge transfer dynamics between transition metal complexes and semiconductor nanostructures are of central importance for many emerging energy and climate relevant technologies. Numerous demonstrations of photovoltaic and photocatalytic activity have been performed based on the combination of strong light absorption in dye molecules with charge separation and transport in adjacent semiconductor nanostructures. However, a fundamental understanding of the enabling and limiting dynamics on critical atomic length- and time scales is often still lacking. Femtosecond time-resolved X-ray photoelectron spectroscopy is employed to gain a better understanding of a short-lived intermediate that may be linked to the unexpectedly limited performance of ZnO based dye-sensitized solar cells by delaying the generation of free charge carriers. The transient spectra strongly suggest that photoexcited dye molecules attached to ZnO nanocrystals inject their charges into the substrate within less than 1 ps but the electrons are then temporarily trapped at the surface of the semiconductor in direct vicinity of the injecting molecules. The experiments are extended to monitor the electronic response of the semiconductor substrate to the collective injection from a monolayer of dye molecules and the subsequent electron-ion recombination dynamics. The results indicate some qualitative similarities but quantitative differences between the recombination dynamics at molecule-semiconductor interfaces and previously studied bulk-surface electron-hole recombination dynamics in photoexcited semiconductors. JF - Accounts of chemical research AU - Gessner, Oliver AU - Gühr, Markus AD - Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States. ; PULSE Institute, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States. Y1 - 2016/01/19/ PY - 2016 DA - 2016 Jan 19 SP - 138 EP - 145 VL - 49 IS - 1 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1760884679?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Accounts+of+chemical+research&rft.atitle=Monitoring+Ultrafast+Chemical+Dynamics+by+Time-Domain+X-ray+Photo-+and+Auger-Electron+Spectroscopy.&rft.au=Gessner%2C+Oliver%3BG%C3%BChr%2C+Markus&rft.aulast=Gessner&rft.aufirst=Oliver&rft.date=2016-01-19&rft.volume=49&rft.issue=1&rft.spage=138&rft.isbn=&rft.btitle=&rft.title=Accounts+of+chemical+research&rft.issn=1520-4898&rft_id=info:doi/10.1021%2Facs.accounts.5b00361 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2016-05-13 N1 - Date created - 2016-01-19 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1021/acs.accounts.5b00361 ER - TY - JOUR T1 - Imaging fossil chemistry in the synchrotron AN - 1873349677; 2017-014082 AB - Fossil morphology and trace metal biomarkers have shown that discrete elemental inventories can be identified for fossil organisms that correlate to specific biosynthetic pathways. Quantitative chemical analyses are rarely undertaken on fossils, despite the potentially valuable information. Ideally such analyses measure and map the chemistry of bone, soft tissue structures, and embedding rock matrix. Mapping fossils in situ helps place constraints on mass transfer between the embedding matrix and fossil, aiding in distinguishing taphonomic processes from original chemical zonation remnant from the fossil itself. Conventional non-destructive analytical methods face serious problems in this case and most recent technological advances have been targeted at developing nanometre-scale rather than decimetre-scale capabilities. However, the development of Synchrotron Rapid Scanning X-ray Fluorescence (SRS-XRF) at the Stanford Synchrotron Radiation Lightsource (SSRL) permits large paleontological specimens to be non-destructively analyzed and imaged using major, minor, and trace element concentrations. Beam line 6-2 at SSRL can operate at an energy range from 2.4 to 17 keV and for each study the excitation energy is optimized. For light-element (Low-Z) XRF images [P, S, Cl, and K] of fossils, an excitation energy of 3.15 keV was chosen; for heavy-element (High-Z) images [Ca, Fe, Ni, Cu, Zn, Se, Ba, and Pb], excitation energies from 9 to 13.5 keV were chosen. Flux at the sample surface varied between approximately 1010 and 1011 photons s-1, depending on the specific analytical conditions. Fossil and extant samples are mounted in a purpose-built sample chamber held on a computerized x-y-z translational stage. For light-element XRF imaging, an X-ray-transparent approximately 30-mu m thick polyethylene film was placed on the sample chamber, and purged of air with He to minimize scattering and increase signal to the detector. Pivotal to the mapping is spectroscopy that constrains oxidation state and coordination chemistry of key elements such as Cu, S, Fe, K, etc., providing insight to the endogeneity of chemistry being mapped to PPM sensitivity. This is a precise, repeatable and quantitative technique building upon decades of research at synchrotron facilities, shedding new light on the chemistry of life in the 21st century. JF - Abstracts with Programs - Geological Society of America AU - Manning, Phillip Lars AU - Egerton, Victoria Margaret AU - Wogelius, Roy A AU - Edwards, Nicholas P AU - Bergmann, Uwe AU - Anonymous Y1 - 2016 PY - 2016 DA - 2016 SP - Abstract no. 218 EP - 2 PB - Geological Society of America (GSA), Boulder, CO VL - 48 IS - 7 SN - 0016-7592, 0016-7592 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1873349677?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Imaging+fossil+chemistry+in+the+synchrotron&rft.au=Manning%2C+Phillip+Lars%3BEgerton%2C+Victoria+Margaret%3BWogelius%2C+Roy+A%3BEdwards%2C+Nicholas+P%3BBergmann%2C+Uwe%3BAnonymous&rft.aulast=Manning&rft.aufirst=Phillip&rft.date=2016-01-01&rft.volume=48&rft.issue=7&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2016 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2017-01-01 N1 - PubXState - CO N1 - Last updated - 2017-03-02 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Physical and chemical alteration of shales during hydraulic fracturing AN - 1832648911; 782756-58 JF - V.M. Goldschmidt Conference - Program and Abstracts AU - Harrison, A L AU - Jew, A D AU - Dustin, M K AU - Kiss, A M AU - Kohli, A H AU - Thomas, D L AU - Joe-Wong, C M AU - Liu, Y AU - Lim, J H AU - Brown, E, Jr AU - Maher, K AU - Bargar, J R AU - Anonymous Y1 - 2016 PY - 2016 DA - 2016 SP - 1058 PB - Goldschmidt Conference, [varies] VL - 26 SN - 1042-7287, 1042-7287 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832648911?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.atitle=Physical+and+chemical+alteration+of+shales+during+hydraulic+fracturing&rft.au=Harrison%2C+A+L%3BJew%2C+A+D%3BDustin%2C+M+K%3BKiss%2C+A+M%3BKohli%2C+A+H%3BThomas%2C+D+L%3BJoe-Wong%2C+C+M%3BLiu%2C+Y%3BLim%2C+J+H%3BBrown%2C+E%2C+Jr%3BMaher%2C+K%3BBargar%2C+J+R%3BAnonymous&rft.aulast=Harrison&rft.aufirst=A&rft.date=2016-01-01&rft.volume=26&rft.issue=&rft.spage=1058&rft.isbn=&rft.btitle=&rft.title=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.issn=10427287&rft_id=info:doi/ L2 - http://goldschmidt.info/2016/uploads/abstracts/finalPDFs/1058.pdf LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2016 N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. N1 - Last updated - 2017-01-24 ER - TY - JOUR T1 - Water Insertion in Kaolinite under Moderate Pressure and Temperature AN - 1832646477; 782758-18 JF - V.M. Goldschmidt Conference - Program and Abstracts AU - Hwang, H AU - Seoung, D AU - Liu, Z AU - Lee, Y AU - Anonymous Y1 - 2016 PY - 2016 DA - 2016 SP - 1218 PB - Goldschmidt Conference, [varies] VL - 26 SN - 1042-7287, 1042-7287 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832646477?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.atitle=Water+Insertion+in+Kaolinite+under+Moderate+Pressure+and+Temperature&rft.au=Hwang%2C+H%3BSeoung%2C+D%3BLiu%2C+Z%3BLee%2C+Y%3BAnonymous&rft.aulast=Hwang&rft.aufirst=H&rft.date=2016-01-01&rft.volume=26&rft.issue=&rft.spage=1218&rft.isbn=&rft.btitle=&rft.title=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.issn=10427287&rft_id=info:doi/ L2 - http://goldschmidt.info/2016/uploads/abstracts/finalPDFs/1218.pdf LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2016 N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. N1 - Last updated - 2017-01-24 ER - TY - JOUR T1 - Ternary structure reveals mechanism of a membrane diacylglycerol kinase. AN - 1750426377; 26673816 AB - Diacylglycerol kinase catalyses the ATP-dependent conversion of diacylglycerol to phosphatidic acid in the plasma membrane of Escherichia coli. The small size of this integral membrane trimer, which has 121 residues per subunit, means that available protein must be used economically to craft three catalytic and substrate-binding sites centred about the membrane/cytosol interface. How nature has accomplished this extraordinary feat is revealed here in a crystal structure of the kinase captured as a ternary complex with bound lipid substrate and an ATP analogue. Residues, identified as essential for activity by mutagenesis, decorate the active site and are rationalized by the ternary structure. The γ-phosphate of the ATP analogue is positioned for direct transfer to the primary hydroxyl of the lipid whose acyl chain is in the membrane. A catalytic mechanism for this unique enzyme is proposed. The active site architecture shows clear evidence of having arisen by convergent evolution. JF - Nature communications AU - Li, Dianfan AU - Stansfeld, Phillip J AU - Sansom, Mark S P AU - Keogh, Aaron AU - Vogeley, Lutz AU - Howe, Nicole AU - Lyons, Joseph A AU - Aragao, David AU - Fromme, Petra AU - Fromme, Raimund AU - Basu, Shibom AU - Grotjohann, Ingo AU - Kupitz, Christopher AU - Rendek, Kimberley AU - Weierstall, Uwe AU - Zatsepin, Nadia A AU - Cherezov, Vadim AU - Liu, Wei AU - Bandaru, Sateesh AU - English, Niall J AU - Gati, Cornelius AU - Barty, Anton AU - Yefanov, Oleksandr AU - Chapman, Henry N AU - Diederichs, Kay AU - Messerschmidt, Marc AU - Boutet, Sébastien AU - Williams, Garth J AU - Marvin Seibert, M AU - Caffrey, Martin AD - School of Medicine and School of Biochemistry and Immunology, Trinity College Dublin, Dublin 2, Ireland. ; Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK. ; School of Molecular Sciences and Center for Applied Structural Discovery at the Biodesign Institute, Arizona State University, Tempe, Arizona 85287, USA. ; Department of Physics, Arizona State University, Tempe, Arizona 85287, USA. ; Department of Chemistry, Bridge Institute, University of Southern California, Los Angeles, California 90089, USA. ; SFI Strategic Research Cluster in Solar Energy Conversion, School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland. ; Center for Free Electron Laser Science, Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany. ; Department of Biology, University of Konstanz, Box 647, D-78457 Konstanz, Germany. ; Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA. Y1 - 2015/12/17/ PY - 2015 DA - 2015 Dec 17 SP - 10140 VL - 6 KW - Adenosine Triphosphate KW - 8L70Q75FXE KW - Diacylglycerol Kinase KW - EC 2.7.1.107 KW - Index Medicus KW - Models, Molecular KW - Adenosine Triphosphate -- metabolism KW - Catalytic Domain KW - Crystallography, X-Ray KW - Protein Conformation KW - Binding Sites KW - Adenosine Triphosphate -- chemistry KW - Diacylglycerol Kinase -- chemistry KW - Cell Membrane -- enzymology KW - Diacylglycerol Kinase -- metabolism KW - Diacylglycerol Kinase -- genetics KW - Escherichia coli -- genetics KW - Escherichia coli -- chemistry KW - Cell Membrane -- chemistry KW - Escherichia coli -- enzymology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1750426377?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+communications&rft.atitle=Ternary+structure+reveals+mechanism+of+a+membrane+diacylglycerol+kinase.&rft.au=Li%2C+Dianfan%3BStansfeld%2C+Phillip+J%3BSansom%2C+Mark+S+P%3BKeogh%2C+Aaron%3BVogeley%2C+Lutz%3BHowe%2C+Nicole%3BLyons%2C+Joseph+A%3BAragao%2C+David%3BFromme%2C+Petra%3BFromme%2C+Raimund%3BBasu%2C+Shibom%3BGrotjohann%2C+Ingo%3BKupitz%2C+Christopher%3BRendek%2C+Kimberley%3BWeierstall%2C+Uwe%3BZatsepin%2C+Nadia+A%3BCherezov%2C+Vadim%3BLiu%2C+Wei%3BBandaru%2C+Sateesh%3BEnglish%2C+Niall+J%3BGati%2C+Cornelius%3BBarty%2C+Anton%3BYefanov%2C+Oleksandr%3BChapman%2C+Henry+N%3BDiederichs%2C+Kay%3BMesserschmidt%2C+Marc%3BBoutet%2C+S%C3%A9bastien%3BWilliams%2C+Garth+J%3BMarvin+Seibert%2C+M%3BCaffrey%2C+Martin&rft.aulast=Li&rft.aufirst=Dianfan&rft.date=2015-12-17&rft.volume=6&rft.issue=&rft.spage=10140&rft.isbn=&rft.btitle=&rft.title=Nature+communications&rft.issn=2041-1723&rft_id=info:doi/10.1038%2Fncomms10140 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2016-05-18 N1 - Date created - 2015-12-17 N1 - Date revised - 2017-02-17 N1 - SuppNotes - Cited By: J Biol Chem. 2000 Mar 10;275(10):6975-9 [10702260] Acta Crystallogr D Biol Crystallogr. 2000 Mar;56(Pt 3):328-41 [10713520] Biochemistry. 2000 Apr 11;39(14):4154-64 [10747807] Proc Natl Acad Sci U S A. 2004 Apr 6;101(14):4793-8 [15051877] J Comput Chem. 2004 Oct;25(13):1656-76 [15264259] J Biol Chem. 1986 May 15;261(14):6239-47 [3009449] J Bacteriol. 1994 Sep;176(17):5459-65 [8071224] Nat Struct Biol. 1996 Feb;3(2):141-8 [8564540] Biochemistry. 1996 Jul 2;35(26):8610-8 [8679623] J Biol Chem. 1997 Sep 26;272(39):24176-82 [9305868] Biochemistry. 1999 Apr 27;38(17):5521-7 [10220339] J Mol Biol. 1999 Jul 9;290(2):559-64 [10390353] Acta Crystallogr D Biol Crystallogr. 2004 Dec;60(Pt 12 Pt 1):2126-32 [15572765] Biochemistry. 2006 Aug 22;45(33):10072-84 [16906765] Science. 2009 Jun 26;324(5935):1726-9 [19556511] Acta Crystallogr D Biol Crystallogr. 2010 Feb;66(Pt 2):125-32 [20124692] Acta Crystallogr D Biol Crystallogr. 2010 Feb;66(Pt 2):213-21 [20124702] Nature. 2011 Feb 3;470(7332):73-7 [21293373] Proc Natl Acad Sci U S A. 2011 May 24;108(21):8639-44 [21555546] Proc Natl Acad Sci U S A. 2011 Sep 27;108(39):16247-52 [21918110] Annu Rev Biophys. 2012;41:81-101 [22224599] Science. 2012 May 25;336(6084):1030-3 [22628654] Annu Rev Biochem. 2012;81:587-613 [22482904] J Vis Exp. 2012;(67):e4001 [22971942] Rep Prog Phys. 2012 Oct;75(10):102601 [22975810] Bioinformatics. 2013 Apr 1;29(7):845-54 [23407358] Structure. 2013 May 7;21(5):810-9 [23602661] Nature. 2013 May 23;497(7450):521-4 [23676677] Acta Crystallogr D Biol Crystallogr. 2013 Jul;69(Pt 7):1260-73 [23793152] Science. 2013 Dec 20;342(6165):1521-4 [24357322] Proc Natl Acad Sci U S A. 2014 Jan 7;111(1):237-42 [24363322] Nat Commun. 2014;5:3309 [24525480] Philos Trans R Soc Lond B Biol Sci. 2014 Jul 17;369(1647):20130313 [24914146] Philos Trans R Soc Lond B Biol Sci. 2014 Jul 17;369(1647):20130621 [24914170] Sci Rep. 2014;4:5806 [25055873] Nat Protoc. 2014 Sep;9(9):2123-34 [25122522] Cell Mol Life Sci. 2014 Dec;71(24):4895-910 [25012698] Acta Crystallogr D Biol Crystallogr. 2015 Mar;71(Pt 3):646-66 [25760612] N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/ncomms10140 ER - TY - JOUR T1 - Carbon characteristics and biogeochemical processes of uranium accumulating organic matter rich sediments in the upper Colorado River basin AN - 1832723482; 2016-091948 AB - Uranium plume persistence in groundwater aquifers is a problem on several former ore processing sites on floodplains in the upper Colorado River Basin. Earlier observations by our group and others at the Old Rifle Site, CO, have noted that U concentrations are highest in organic rich, fine-grained, and, therefore, diffusion limited sediment material. Due to the constantly evolving depositional environments of floodplains, surficial organic matter may become buried at various stages of decomposition, through sudden events such as overbank flooding and through the slower progression of river meandering. This creates a discontinuous subsurface distribution of organic-rich sediments, which are hotspots for microbial activity and thereby central to the subsurface cycling of contaminants (e.g. U) and biologically relevant elements (e.g. C, N, P, Fe). However, the organic matter itself is poorly characterized. Consequently, little is known about its relevance in driving biogeochemical processes that control U fate and transport in the subsurface. In an investigation of soil/sediment cores from five former uranium ore processing sites on floodplains distributed across the Upper Colorado River Basin we confirmed consistent co-enrichment of U with organic-rich layers in all profiles. However, using C K-edge X-ray Absorption Spectroscopy (XAS) coupled with Fourier-Transformed Ion-Cyclotron-Resonance Mass-Spectroscopy (FT-ICR-MS) on bulk sediments and density-separated organic matter fractions, we did not detect any chemical difference in the organic rich sediments compared to the surrounding coarser-grained aquifer material within the same profile, even though there were differences in organic matter composition between the 5 sites. This suggests that U retention and reduction to U(IV) is independent of C chemical composition on the bulk scale. Instead it appears to be the abundance of organic matter in combination with a limited O2 supply in the fine-grained material that stimulate anaerobic microbial processes responsible for U enrichment. Thus, the chemical composition of organic matter is subordinate to the physical environment and total organic matter content in controlling U reduction and retention processes. JF - American Geophysical Union Fall Meeting AU - Boye, K AU - Noel, V AU - Tfaily, M M AU - Dam, W L AU - Bargar, J AU - Fendorf, S E AU - Anonymous Y1 - 2015/12// PY - 2015 DA - December 2015 SP - Abstract H33N EP - 05 PB - American Geophysical Union, Washington, DC VL - 2015 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832723482?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Carbon+characteristics+and+biogeochemical+processes+of+uranium+accumulating+organic+matter+rich+sediments+in+the+upper+Colorado+River+basin&rft.au=Boye%2C+K%3BNoel%2C+V%3BTfaily%2C+M+M%3BDam%2C+W+L%3BBargar%2C+J%3BFendorf%2C+S+E%3BAnonymous&rft.aulast=Boye&rft.aufirst=K&rft.date=2015-12-01&rft.volume=2015&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2015 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Spectrosmicroscopic and spectroscopic investigation of U(IV) speciation in model mineral-organic matter assemblages AN - 1832723355; 2016-091949 AB - Both nanocrystalline uraninite (UO2) and non-crystalline U(IV) occur in anoxic sediments, controlling the fate and transport of U in contaminated aquifers. It is important to distinguish between these forms of U because non-crystalline species are more reactive towards oxidants and aqueous complexing ligands, increasing the likelihood of U re-release into groundwater in the presence of such solutes. Much work has been done to elucidate microbiological and geochemical conditions favoring non-crystalline U(IV) or UO2 formation, primarily in model systems containing a single type of U(VI)-reducing bacterium. Research suggests that microbial biomass, including cell walls and exopolymeric substances (EPS), can adsorb U(IV), likely via phosphoryl groups. Furthermore, conditions that favor EPS formation appear to promote non-crystalline U(IV) formation. Non-crystalline U(IV) formation is also favored in the presence of phosphate. However, U(IV) behavior in complicated systems containing competing U(IV) sorbents has not been studied. Investigations of U(IV) behavior in such systems are needed to understand uranium mobility in natural sediments, which contain multiple sinks for U(IV). We have developed a model system in which the native microbial consortia associated with partially decayed plant roots utilize homogenized root material to facilitate U(VI) reduction during anaerobic incubations. The model is intended to simulate an environment similar to that found in anoxic sediments where buried organic matter drives anaerobic respiration. We use this model to address the following questions: (1) Does U(IV) become associated with organic materials or minerals (or both)? (2) Does U(IV) form complexes with particular ligands, such as P? (3) Is UO2 produced when aqueous U(VI) concentrations are relatively low ( nearly equal 1 mu M), which is typical of even contaminated sites? We have found that U(IV) does not form UO2 at low, environmentally relevant U:sorbent ratios. Furthermore, nanocrystalline and non-crystalline U(IV) associate with both inorganic and organic sorbents, suggesting that, although microbially-derived sedimentary organic matter can play an important role in U(IV) behavior, so can the inorganic sedimentary matrix. JF - American Geophysical Union Fall Meeting AU - Bone, S AU - Dynes, James AU - Bargar, J AU - Anonymous Y1 - 2015/12// PY - 2015 DA - December 2015 SP - Abstract H33N EP - 06 PB - American Geophysical Union, Washington, DC VL - 2015 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832723355?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Spectrosmicroscopic+and+spectroscopic+investigation+of+U%28IV%29+speciation+in+model+mineral-organic+matter+assemblages&rft.au=Bone%2C+S%3BDynes%2C+James%3BBargar%2C+J%3BAnonymous&rft.aulast=Bone&rft.aufirst=S&rft.date=2015-12-01&rft.volume=2015&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2015 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Geochemical drivers of organic matter decomposition in arctic tundra soils AN - 1832675777; 767475-10 AB - Climate change is warming tundra ecosystems in the Arctic, resulting in the decomposition of previously-frozen soil organic matter (SOM) and release of carbon (C) to the atmosphere; however, the processes that control SOM decomposition and C emissions remain highly uncertain. In this study, we evaluate geochemical factors that influence microbial production of carbon dioxide (CO (sub 2) ) and methane (CH (sub 4) ) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, CH (sub 4) was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that CH (sub 4) would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. We infer that geochemical differences induced by water saturation dictate microbial products of SOM decomposition, and Fe geochemistry is an important factor regulating methanogenesis in anoxic tundra soils. Copyright 2015 Springer International Publishing Switzerland JF - Biogeochemistry (Dordrecht) AU - Herndon, Elizabeth M AU - Yang, Ziming AU - Bargar, John AU - Janot, Noemie AU - Regier, Tom Z AU - Graham, David E AU - Wullschleger, Stan D AU - Gu, Baohua AU - Liang, Liyuan Y1 - 2015/12// PY - 2015 DA - December 2015 SP - 397 EP - 414 PB - Springer, Dordrecht - Boston - Lancaster VL - 126 IS - 3 SN - 0168-2563, 0168-2563 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832675777?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Biogeochemistry+%28Dordrecht%29&rft.atitle=Geochemical+drivers+of+organic+matter+decomposition+in+arctic+tundra+soils&rft.au=Herndon%2C+Elizabeth+M%3BYang%2C+Ziming%3BBargar%2C+John%3BJanot%2C+Noemie%3BRegier%2C+Tom+Z%3BGraham%2C+David+E%3BWullschleger%2C+Stan+D%3BGu%2C+Baohua%3BLiang%2C+Liyuan&rft.aulast=Herndon&rft.aufirst=Elizabeth&rft.date=2015-12-01&rft.volume=126&rft.issue=3&rft.spage=397&rft.isbn=&rft.btitle=&rft.title=Biogeochemistry+%28Dordrecht%29&rft.issn=01682563&rft_id=info:doi/10.1007%2Fs10533-015-0165-5 L2 - http://www.springerlink.com/content/100244/ LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - SuppNotes - The online version of this article (doi:10.1007/s10533-015-0165-5) contains supplementary material, which is available to authorized users. N1 - Last updated - 2017-01-24 DO - http://dx.doi.org/10.1007/s10533-015-0165-5 ER - TY - JOUR T1 - Combining U speciation and U isotope fractionation to evaluate the importance of naturally reduced sediments in controlling the mobility of uranium in the upper Colorado River Basin AN - 1828846560; 2016-086372 AB - Long-term persistence of uranium (U) in groundwater at legacy ore-processing sites in the upper Colorado River Basin (CRB) is a major concern for DOE, stakeholders, and local property owners. In the past year, we have investigated U distributions in contaminated floodplains at Grand Junction, Naturita, and Rifle (CO), Riverton (WY), and Shiprock (NM). We find that U is retained at all locations in fine-grained, organic-rich sulfidic sediments, referred to as naturally reduced zones (NRZs). The retention mechanisms (e.g., complexation, precipitation or adsorption) and the processes responsible for U accumulation in NRZs will directly determine the capacity of the sediments to prevent U mobilization. However, these processes remain poorly understood at local and regional scales yet they are critical to management and remediation of these sites. We have used U LIII/II-edge XANES to systematically characterize U oxidation states, and EXAFS and bicarbonate extractions to characterize U local structure and reactivity in order to distinguish the forms of U. We are measuring U isotopic signatures (delta (super 238/235) U) to better understand uranium sources and processes of accumulation in NRZs. We have found that high U concentrations correspond to reduced and relatively insoluble U forms, mainly non-crystalline U(IV), and co-occur with ferrous iron and sulfides. This suggests that reduction processes, fueled by the high organic matter content and constrained to the diffusion-limited environment in the fine-grained NRZs, are important for the retention of U in these sediments. We also observe a strong correlation between the U concentrations in the NRZs and the extent of isotopic fractionation, with up to +1.8 ppm difference between uranium-enriched and low concentration zones. In some locations the delta (super 238/235) U values are within the range of values typical of the mine tailings, whereas at other sites the more positive delta (super 238/235) U values suggest that redox cycling and/or partial reduction of uranium are occurring. These results suggest that organic-rich reduced sediments play important roles governing uranium mobility in contaminated floodplains regionally within the upper CRB and other locations where organic sediments occur JF - American Geophysical Union Fall Meeting AU - Noel, V AU - Lefebvre, Pierre AU - Boye, K AU - Bargar, J AU - Maher, K AU - Lezama-Pacheco, J AU - Cardarelli, E AU - Bone, Sharon E AU - Dam, William L AU - Johnson, Raymond H AU - Anonymous Y1 - 2015/12// PY - 2015 DA - December 2015 SP - Abstract H31I EP - 1544 PB - American Geophysical Union, Washington, DC VL - 2015 KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1828846560?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Combining+U+speciation+and+U+isotope+fractionation+to+evaluate+the+importance+of+naturally+reduced+sediments+in+controlling+the+mobility+of+uranium+in+the+upper+Colorado+River+Basin&rft.au=Noel%2C+V%3BLefebvre%2C+Pierre%3BBoye%2C+K%3BBargar%2C+J%3BMaher%2C+K%3BLezama-Pacheco%2C+J%3BCardarelli%2C+E%3BBone%2C+Sharon+E%3BDam%2C+William+L%3BJohnson%2C+Raymond+H%3BAnonymous&rft.aulast=Noel&rft.aufirst=V&rft.date=2015-12-01&rft.volume=2015&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2015 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - Clay mineralogy of an alluvial aquifer in a mountainous, semiarid terrain, an example from Rifle, Colorado AN - 1828846498; 2016-086377 AB - Alluvial sediments deposited along the Colorado River corridor in the semi-arid regions of central to western Colorado can be important hosts for legacy contamination including U, V, As and Se. These alluvial sediments host aquifers which are thought to provide important "hot spots" and "hot moments" for microbiological activity controlling organic carbon processing and fluxes in the subsurface. Relatively little is known about the clay mineralogy of these alluvial aquifers and the parent alluvial sediments in spite of the fact that they commonly include lenses of silt-clay materials. These lenses are typically more reduced than coarser grained materials, but zones of reduced and more oxidized materials are present in these alluvial aquifer sediments. The clay mineralogy of the non-reduced parent alluvial sediments of the alluvial aquifer located in Rifle, CO (USA) is composed of chlorite, smectite, illite, kaolinite and quartz. The clay mineralogy of non-reduced fine-grained materials at Rifle are composed of the same suite of minerals found in the sediments plus a vermiculite-smectite intergrade that occurs near the bottom of the aquifer near the top of the Wasatch Formation. The clay mineral assemblages of the system reflect the mineralogically immature character of the source sediments. These assemblages are consistent with sediments and soils that formed in a moderately low rainfall climate and suggestive of minimal transport of the alluvial sediments from their source areas. Chlorite, smectite, smectite-vermiculite intergrade, and illite are the likely phases involved in the sorption of organic carbon and related microbial redox transformations of metals in these sediments. Both the occurrence and abundance of chlorite, smectite-vermiculite, illite and smectite can therefore exert an important control on the contaminant fluxes and are important determinants of biogeofacies in mountainous, semiarid terrains. JF - American Geophysical Union Fall Meeting AU - Elliott, W C AU - Lim, D AU - Zaunbrecher, L K AU - Pickering, R A AU - Williams, K H AU - Navarre-Sitchler, Alexis K AU - Long, P E AU - Noel, V AU - Bargar, J AU - Qafoku, Nik P AU - Anonymous Y1 - 2015/12// PY - 2015 DA - December 2015 SP - Abstract H31I EP - 1549 PB - American Geophysical Union, Washington, DC VL - 2015 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1828846498?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Clay+mineralogy+of+an+alluvial+aquifer+in+a+mountainous%2C+semiarid+terrain%2C+an+example+from+Rifle%2C+Colorado&rft.au=Elliott%2C+W+C%3BLim%2C+D%3BZaunbrecher%2C+L+K%3BPickering%2C+R+A%3BWilliams%2C+K+H%3BNavarre-Sitchler%2C+Alexis+K%3BLong%2C+P+E%3BNoel%2C+V%3BBargar%2C+J%3BQafoku%2C+Nik+P%3BAnonymous&rft.aulast=Elliott&rft.aufirst=W&rft.date=2015-12-01&rft.volume=2015&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2015 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - A multifaceted sampling approach to better understanding biogeochemical and hydrogeological controls on uranium mobility at a former uranium mill tailings site in Riverton, Wyoming AN - 1828845574; 2016-086378 AB - Understanding uranium mobility in subsurface environments is not trivial. Obtaining sufficient data to accurately represent soil and aquifer characteristics can require unique approaches that evolve with added site knowledge. At Riverton, the primary source of uranium mill tailings remaining from ore processing was removed but contaminant plumes have persisted longer than predicted by groundwater modeling. What are the primary mechanisms controlling plume persistence? DOE is conducting new characterization studies to assist our understanding of underlying biogeochemical and hydrogeological mechanisms affecting secondary sources. A variety of field sampling techniques are being sequentially employed including augering, trenching, pore water sampling, and installing multi-level wells. In August 2012, vadose zone soil samples from 34 locations and groundwater from 103 boreholes were collected with Geoprobe (Registered) direct push rods. Lower than expected uranium concentrations in composited shallow soils indicated the need for more focused and deeper samples. In May 2014, soil samples containing evaporites were collected along the bank of the Little Wind River; elevated uranium concentrations in evaporite minerals correlated with plume configurations and reflect contaminated groundwater discharge at the river. In September 2014, hand anger samples collected by the river and oxbow lake also indicated the presence of organic rich zones containing elevated uranium (>50 mg/kg). Subsequent samples collected from five backhoe trenches in May 2015 revealed a highly heterogeneous vadose zone composed of clay, silt, sand and cobbles containing evaporites and organic rich zones which may interact with groundwater plumes. Plans for August 2015 include sonic drilling to obtain continuous cores from the surface down to the base of the surficial aquifer with multi-level monitoring wells constructed in each borehole to assess vertical variation in groundwater chemistry. Temporary well-points will be installed adjacent to the river to assess geochemical and flow controls in the area of plume stagnation. Analyses include critical element speciation (C, S, Fe, and U), microbes, isotopes, diffusivity and flow characteristics. These activities support a dramatically improved understanding of plume persistence. JF - American Geophysical Union Fall Meeting AU - Dam, William L AU - Johnson, Raymond H AU - Campbell, Sam AU - Bone, Sharon E AU - Noel, V AU - Bargar, J AU - Anonymous Y1 - 2015/12// PY - 2015 DA - December 2015 SP - Abstract H31I EP - 1550 PB - American Geophysical Union, Washington, DC VL - 2015 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1828845574?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+multifaceted+sampling+approach+to+better+understanding+biogeochemical+and+hydrogeological+controls+on+uranium+mobility+at+a+former+uranium+mill+tailings+site+in+Riverton%2C+Wyoming&rft.au=Dam%2C+William+L%3BJohnson%2C+Raymond+H%3BCampbell%2C+Sam%3BBone%2C+Sharon+E%3BNoel%2C+V%3BBargar%2C+J%3BAnonymous&rft.aulast=Dam&rft.aufirst=William&rft.date=2015-12-01&rft.volume=2015&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2015 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - Studying iron mineralogy to understand redox conditions in the Mesoproterozoic belt basin, USA using complementary microscopic, spectroscopic, and magnetic techniques AN - 1800396770; 2016-058296 AB - Observations of iron chemistry and mineralogy over time provide a valuable tool for studying paleoenvironments, but questions still remain as to the redox character of Proterozoic basins after the rise of oxygen. To evaluate the mechanisms of iron mineralization in Proterozoic samples, we developed an approach that pairs the microscale textural techniques of light microscopy, magnetic scanning microscopy, and (synchrotron-based) microprobe x-ray spectroscopy with sensitive bulk rock magnetic experiments. Samples were collected from stratigraphic sections across the approximately 1.4 Ga lower Belt Group, Belt Supergroup, MT and ID, USA with a focus on excellently preserved sedimentary rocks, but also including those altered by a variety of diagenetic, metamorphic, and metasomatic events. Results show that even in the best-preserved parts of the Belt Basin, late diagenetic and/or metasomatic fluids affected (in some cases very mildly) the primary iron phases as evidenced by prevalent post-depositional alterations such as rare base metal sulfides. In more heavily altered rocks, the appearance of pyrrhotite and other minerals signaled transformations in iron mineralogy through metamorphism and metasomatism. Despite these secondary phases crystallizing in an open fluid-rich system, primary records of redox chemistry were preserved in the recrystallized early diagenetic framboidal pyrite and (sub)micron-sized detrital magnetite grains. Detrital magnetite is not the most abundant iron-bearing phase in any of the samples (typically <0.01 wt%), but is widely observed in both proximal and deeper basin facies, illustrating an important detrital flux of iron to the basin and a highly reactive iron source for early diagenetic pyrite. Based on our analyses, we interpret the shallow waters of the Belt Basin to be oxic with sulfidic pore fluids and deeper waters in parts of the basin as likely euxinic, consistent with the results of some bulk geochemical proxies. This redox reconstruction also helps explain the exceptional fossil record and diversity of eukaryotes observed in Belt Basin paleoenvironments. JF - American Geophysical Union Fall Meeting AU - Slotznick, Sarah P AU - Webb, Samuel AU - Kirschvink, Joseph L AU - Fischer, Woodward W AU - Sessions, A L AU - Anonymous Y1 - 2015/12// PY - 2015 DA - December 2015 SP - Abstract PP31B EP - 2252 PB - American Geophysical Union, Washington, DC VL - 2015 KW - 12:Stratigraphy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1800396770?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Studying+iron+mineralogy+to+understand+redox+conditions+in+the+Mesoproterozoic+belt+basin%2C+USA+using+complementary+microscopic%2C+spectroscopic%2C+and+magnetic+techniques&rft.au=Slotznick%2C+Sarah+P%3BWebb%2C+Samuel%3BKirschvink%2C+Joseph+L%3BFischer%2C+Woodward+W%3BSessions%2C+A+L%3BAnonymous&rft.aulast=Slotznick&rft.aufirst=Sarah&rft.date=2015-12-01&rft.volume=2015&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2015 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-06-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Ni cycling in mangrove sediments from New Caledonia AN - 1780804235; 2016-034207 AB - Covering more than 70% of tropical and subtropical coastlines, mangrove intertidal forests are well known to accumulate potentially toxic trace metals in their sediments, and thus are generally considered to play a protective role in marine and lagoon ecosystems. However, the chemical forms of these trace metals in mangrove sediments are still not well known, even though their molecular-level speciation controls their long-term behavior. Here we report the vertical and lateral changes in the chemical forms of nickel, which accumulates massively in mangrove sediments downstream from lateritized ultramafic deposits from New Caledonia, where one of nature's largest accumulations of nickel occurs. To accomplish this we used Ni K-edge Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy data in combination with microscale chemical analyses using Scanning Electron Microscopy coupled with Energy-Dispersive X-ray Spectroscopy (SEM-EDXS). After Principal Component and Target Transform analyses (PCA-TT), the EXAFS data of the mangrove sediments were reliably least-squares fitted by linear combination of 3-components chosen from a large model compound spectral database including synthetic and natural Ni-bearing sulfides, clay minerals, oxyhydroxides, and organic complexes. Our results show that in the inland salt flat Ni is hosted in minerals inherited from the eroded lateritic materials, i.e. Ni-poor serpentine (44-58%), Ni-rich talc (20-31%), and Ni-goethite (18-24%). In contrast, in the hydromorphic sediments beneath the vegetated Avicennia and Rhizophora stands, a large fraction of Ni is partly redistributed into a neoformed smectite pool (20-69% of Ni-montmorillonite), and Ni speciation significantly changes with depth in the sediment. Indeed, Ni-rich talc (25-56%) and Ni-goethite (15-23%) disappear below approximately 15 cm depth in the sediment and are replaced by Ni-sorbed pyrite (23-52%) in redox-active intermediate depth layers and by pyrite (34-55%) in the deepest sediment layers. Ni-incorporation in pyrite is especially observed beneath an inland Avicennia stand where anoxic conditions are dominant. In contrast, beneath a Rhizophora stand closer to the ocean, where the redox cycle is intensified due to the tide cycle, partial re-oxidation of Ni-bearing pyrites favors nickel mobility, as confirmed by Ni-mass balance estimates and by higher Ni concentration in the pore waters. These findings have important environmental implications for better evaluating the protective role of mangroves against trace metal dispersion into marine ecosystems. They may also help in predicting the response of mangrove ecosystems to increasing anthropogenic pressure on coastal areas. Abstract Copyright (2015) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Noel, Vincent AU - Morin, Guillaume AU - Juillot, Farid AU - Marchand, Cyril AU - Brest, Jessica AU - Bargar, John R AU - Munoz, Manuel AU - Marakovic, Gregory AU - Ardo, Sandy AU - Brown, Gordon E, Jr Y1 - 2015/11/15/ PY - 2015 DA - 2015 Nov 15 SP - 82 EP - 98 PB - Elsevier, New York, NY VL - 169 SN - 0016-7037, 0016-7037 KW - silicates KW - goethite KW - mangrove swamps KW - mass spectra KW - ecosystems KW - vegetation KW - environmental analysis KW - XANES spectra KW - mass balance KW - sediments KW - X-ray fluorescence spectra KW - oxides KW - spectra KW - Eh KW - New Caledonia KW - forests KW - toxic materials KW - shore features KW - Vavouto Bay KW - recycling KW - pollutants KW - smectite KW - shorelines KW - pollution KW - electron microscopy data KW - X-ray spectra KW - EDS spectra KW - clay minerals KW - ICP mass spectra KW - mires KW - Talea-Coco River KW - metals KW - swamps KW - Oceania KW - nickel KW - EXAFS data KW - sheet silicates KW - Melanesia KW - lagoons KW - SEM data KW - pore water KW - 02C:Geochemistry of rocks, soils, and sediments KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1780804235?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Ni+cycling+in+mangrove+sediments+from+New+Caledonia&rft.au=Noel%2C+Vincent%3BMorin%2C+Guillaume%3BJuillot%2C+Farid%3BMarchand%2C+Cyril%3BBrest%2C+Jessica%3BBargar%2C+John+R%3BMunoz%2C+Manuel%3BMarakovic%2C+Gregory%3BArdo%2C+Sandy%3BBrown%2C+Gordon+E%2C+Jr&rft.aulast=Noel&rft.aufirst=Vincent&rft.date=2015-11-15&rft.volume=169&rft.issue=&rft.spage=82&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2015.07.024 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2016-01-01 N1 - Number of references - 68 N1 - PubXState - NY N1 - Document feature - illus. incl. 4 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2016-04-14 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - clay minerals; ecosystems; EDS spectra; Eh; electron microscopy data; environmental analysis; EXAFS data; forests; goethite; ICP mass spectra; lagoons; mangrove swamps; mass balance; mass spectra; Melanesia; metals; mires; New Caledonia; nickel; Oceania; oxides; pollutants; pollution; pore water; recycling; sediments; SEM data; sheet silicates; shore features; shorelines; silicates; smectite; spectra; swamps; Talea-Coco River; toxic materials; Vavouto Bay; vegetation; X-ray fluorescence spectra; X-ray spectra; XANES spectra DO - http://dx.doi.org/10.1016/j.gca.2015.07.024 ER - TY - JOUR T1 - Bioturbating animals control the mobility of redox-sensitive trace elements in organic-rich mudstone AN - 1756508176; 2016-005372 AB - Bioturbating animals modify the original mineralogy, porosity, organic content, and fabric of mud, thus affecting the burial diagenetic pathways of potential hydrocarbon source, seal, and reservoir rocks. High-sensitivity, synchrotron rapid scanning X-ray fluorescence elemental mapping reveals that producers of phycosiphoniform burrows systematically partition redox-sensitive trace elements (i.e., Fe, V, Cr, Mn, Co, Ni, Cu, and As) in fine-grained siliciclastic rocks. Systematic differences in organic carbon content (total organic carbon >1.5 wt%) and quality (Delta (super 13) C (sub org) approximately 0.6 ppm) are measured between the burrow core and host sediment. The relative enrichment of redox-sensitive elements in the burrow core does not correlate with significant neo-formation of early diagenetic pyrite (via trace metal pyritization), but is best explained by physical concentration of clay- and silt-sized components. A measured loss ( approximately -15%) of the large-ionic-radius elements Sr and Ba from both burrow halo and core is most likely associated with the release of Sr and Ba to pore waters during biological (in vivo) weathering of silt- to clay-sized lithic components and feldspar. This newly documented effect has significant potential to inform the interpretation of geochemical proxy and rock property data, particularly from shales, where elemental analyses are commonly employed to predict reservoir quality and support paleoenvironmental analysis. JF - Geology (Boulder) AU - Harazim, Dario AU - McIlroy, Duncan AU - Edwards, Nicholas P AU - Wogelius, Roy A AU - Manning, Phillip L AU - Poduska, Kristin M AU - Layne, Graham D AU - Sokaras, Dimosthenis AU - Alonso-Mori, Roberto AU - Bergmann, Uwe Y1 - 2015/11// PY - 2015 DA - November 2015 SP - 1007 EP - 1010 PB - Geological Society of America (GSA), Boulder, CO VL - 43 IS - 11 SN - 0091-7613, 0091-7613 KW - petroleum exploration KW - Cretaceous KW - pyritization KW - petroleum KW - metasomatism KW - Upper Cretaceous KW - Rosario Formation KW - synchrotron radiation KW - partitioning KW - sedimentary rocks KW - Baja California KW - barium KW - carbon KW - X-ray fluorescence spectra KW - spectra KW - trace elements KW - organic carbon KW - sedimentary structures KW - Eh KW - alkaline earth metals KW - mudstone KW - biogenic structures KW - Rosario Mexico KW - electron microscopy data KW - weathering KW - Mesozoic KW - biogenic processes KW - paleoenvironment KW - Mexico KW - biofacies KW - metals KW - diagenesis KW - burrows KW - reservoir properties KW - pyrite KW - sulfides KW - clastic rocks KW - bioturbation KW - strontium KW - SEM data KW - 06A:Sedimentary petrology KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1756508176?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geology+%28Boulder%29&rft.atitle=Bioturbating+animals+control+the+mobility+of+redox-sensitive+trace+elements+in+organic-rich+mudstone&rft.au=Harazim%2C+Dario%3BMcIlroy%2C+Duncan%3BEdwards%2C+Nicholas+P%3BWogelius%2C+Roy+A%3BManning%2C+Phillip+L%3BPoduska%2C+Kristin+M%3BLayne%2C+Graham+D%3BSokaras%2C+Dimosthenis%3BAlonso-Mori%2C+Roberto%3BBergmann%2C+Uwe&rft.aulast=Harazim&rft.aufirst=Dario&rft.date=2015-11-01&rft.volume=43&rft.issue=11&rft.spage=1007&rft.isbn=&rft.btitle=&rft.title=Geology+%28Boulder%29&rft.issn=00917613&rft_id=info:doi/10.1130%2FG37025.1 L2 - http://geology.gsapubs.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 26 N1 - PubXState - CO N1 - Document feature - illus. incl. sketch map N1 - SuppNotes - GSA Data Repository item 2015338 N1 - Last updated - 2016-01-14 N1 - CODEN - GLGYBA N1 - SubjectsTermNotLitGenreText - alkaline earth metals; Baja California; barium; biofacies; biogenic processes; biogenic structures; bioturbation; burrows; carbon; clastic rocks; Cretaceous; diagenesis; Eh; electron microscopy data; Mesozoic; metals; metasomatism; Mexico; mudstone; organic carbon; paleoenvironment; partitioning; petroleum; petroleum exploration; pyrite; pyritization; reservoir properties; Rosario Formation; Rosario Mexico; sedimentary rocks; sedimentary structures; SEM data; spectra; strontium; sulfides; synchrotron radiation; trace elements; Upper Cretaceous; weathering; X-ray fluorescence spectra DO - http://dx.doi.org/10.1130/G37025.1 ER - TY - JOUR T1 - Structure of the toxic core of α-synuclein from invisible crystals. AN - 1716932480; 26352473 AB - The protein α-synuclein is the main component of Lewy bodies, the neuron-associated aggregates seen in Parkinson disease and other neurodegenerative pathologies. An 11-residue segment, which we term NACore, appears to be responsible for amyloid formation and cytotoxicity of human α-synuclein. Here we describe crystals of NACore that have dimensions smaller than the wavelength of visible light and thus are invisible by optical microscopy. As the crystals are thousands of times too small for structure determination by synchrotron X-ray diffraction, we use micro-electron diffraction to determine the structure at atomic resolution. The 1.4 Å resolution structure demonstrates that this method can determine previously unknown protein structures and here yields, to our knowledge, the highest resolution achieved by any cryo-electron microscopy method to date. The structure exhibits protofibrils built of pairs of face-to-face β-sheets. X-ray fibre diffraction patterns show the similarity of NACore to toxic fibrils of full-length α-synuclein. The NACore structure, together with that of a second segment, inspires a model for most of the ordered portion of the toxic, full-length α-synuclein fibril, presenting opportunities for the design of inhibitors of α-synuclein fibrils. JF - Nature AU - Rodriguez, Jose A AU - Ivanova, Magdalena I AU - Sawaya, Michael R AU - Cascio, Duilio AU - Reyes, Francis E AU - Shi, Dan AU - Sangwan, Smriti AU - Guenther, Elizabeth L AU - Johnson, Lisa M AU - Zhang, Meng AU - Jiang, Lin AU - Arbing, Mark A AU - Nannenga, Brent L AU - Hattne, Johan AU - Whitelegge, Julian AU - Brewster, Aaron S AU - Messerschmidt, Marc AU - Boutet, Sébastien AU - Sauter, Nicholas K AU - Gonen, Tamir AU - Eisenberg, David S AD - Howard Hughes Medical Institute, UCLA-DOE Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Box 951570, UCLA, Los Angeles, California 90095-1570, USA. ; Howard Hughes Medical Institute, Janelia Research Campus, 19700 Helix Drive, Ashburn, Virginia 20147, USA. ; Box 42, NPI-Semel Institute, 760 Westwood Plaza, UCLA, Los Angeles, California 90024, USA. ; Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. ; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA. Y1 - 2015/09/24/ PY - 2015 DA - 2015 Sep 24 SP - 486 EP - 490 VL - 525 IS - 7570 KW - Amyloid KW - 0 KW - SNCA protein, human KW - alpha-Synuclein KW - Index Medicus KW - Lewy Bodies -- chemistry KW - Scattering, Radiation KW - Electrons KW - Parkinson Disease KW - Models, Molecular KW - Humans KW - Amyloid -- chemistry KW - Cryoelectron Microscopy KW - Protein Structure, Tertiary KW - alpha-Synuclein -- chemistry KW - alpha-Synuclein -- toxicity KW - Nanoparticles -- toxicity KW - Nanoparticles -- chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1716932480?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature&rft.atitle=Structure+of+the+toxic+core+of+%CE%B1-synuclein+from+invisible+crystals.&rft.au=Rodriguez%2C+Jose+A%3BIvanova%2C+Magdalena+I%3BSawaya%2C+Michael+R%3BCascio%2C+Duilio%3BReyes%2C+Francis+E%3BShi%2C+Dan%3BSangwan%2C+Smriti%3BGuenther%2C+Elizabeth+L%3BJohnson%2C+Lisa+M%3BZhang%2C+Meng%3BJiang%2C+Lin%3BArbing%2C+Mark+A%3BNannenga%2C+Brent+L%3BHattne%2C+Johan%3BWhitelegge%2C+Julian%3BBrewster%2C+Aaron+S%3BMesserschmidt%2C+Marc%3BBoutet%2C+S%C3%A9bastien%3BSauter%2C+Nicholas+K%3BGonen%2C+Tamir%3BEisenberg%2C+David+S&rft.aulast=Rodriguez&rft.aufirst=Jose&rft.date=2015-09-24&rft.volume=525&rft.issue=7570&rft.spage=486&rft.isbn=&rft.btitle=&rft.title=Nature&rft.issn=1476-4687&rft_id=info:doi/10.1038%2Fnature15368 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2015-10-19 N1 - Date created - 2015-09-24 N1 - Date revised - 2017-02-17 N1 - Genetic sequence - 4ZNN; PDB; 4RIK; 4RIL N1 - SuppNotes - Cited By: Nat Rev Neurol. 2013 Jan;9(1):13-24 [23183883] PLoS One. 2013;8(5):e63557 [23667637] Acta Crystallogr D Biol Crystallogr. 2013 Jul;69(Pt 7):1274-82 [23793153] Nat Commun. 2013;4:2575 [24108358] Elife. 2013;2:e01345 [24252878] Nat Methods. 2014 May;11(5):545-8 [24633409] Nat Methods. 2014 Sep;11(9):927-30 [25086503] Curr Opin Struct Biol. 2014 Aug;27:24-31 [24709395] Elife. 2014;3:e03600 [25303172] Proc Natl Acad Sci U S A. 2015 Mar 17;112(11):3368-73 [25730881] Proc Natl Acad Sci U S A. 2015 Apr 21;112(16):E1994-2003 [25855634] Acta Crystallogr D Biol Crystallogr. 2012 Apr;68(Pt 4):352-67 [22505256] Rev Sci Instrum. 2012 Mar;83(3):035108 [22462961] Neurosci Lett. 2000 Oct 6;292(2):128-30 [10998565] J Biol Chem. 2000 Nov 3;275(44):34574-9 [10942772] J Biol Chem. 2001 Jan 26;276(4):2380-6 [11060312] J Neurochem. 2001 Jul;78(2):384-95 [11461974] J Biol Chem. 2002 May 24;277(21):19213-9 [11893734] Protein Sci. 2002 Jun;11(6):1415-23 [12021440] Mol Cell Proteomics. 2002 Oct;1(10):816-27 [12438564] Biochemistry. 2003 Jul 29;42(29):8870-8 [12873148] J Biol Chem. 2003 Sep 26;278(39):37530-5 [12815044] Annu Rev Neurosci. 2003;26:267-98 [12704221] Science. 2003 Oct 31;302(5646):841 [14593171] Ann Neurol. 2004 Feb;55(2):164-73 [14755719] Lancet. 2004 Sep 25-Oct 1;364(9440):1169-71 [15451225] Proc Natl Acad Sci U S A. 1993 Dec 1;90(23):11282-6 [8248242] FEBS Lett. 1994 May 23;345(1):27-32 [8194594] Science. 1997 Jun 27;276(5321):2045-7 [9197268] Nature. 1997 Aug 28;388(6645):839-40 [9278044] Chem Biol. 1995 Mar;2(3):163-9 [9383418] Nat Genet. 1998 Feb;18(2):106-8 [9462735] Nat Med. 1998 Nov;4(11):1318-20 [9809558] FEBS Lett. 1998 Nov 27;440(1-2):71-5 [9862428] Proc Natl Acad Sci U S A. 2004 Nov 23;101(47):16466-71 [15536128] Acta Crystallogr D Biol Crystallogr. 2004 Dec;60(Pt 12 Pt 1):2210-21 [15572774] Nature. 2005 Jun 9;435(7043):773-8 [15944695] J Neurosci. 2007 Mar 21;27(12):3338-46 [17376994] Nature. 2007 May 24;447(7143):453-7 [17468747] J Biol Chem. 2007 Aug 24;282(34):24970-9 [17573347] Nat Protoc. 2007;2(11):2728-33 [18007608] J Neurochem. 2007 Dec;103(6):2401-7 [17883396] Proc Natl Acad Sci U S A. 2008 Jun 24;105(25):8637-42 [18550842] EMBO J. 2009 Oct 21;28(20):3256-68 [19745811] Acta Crystallogr D Biol Crystallogr. 2010 Feb;66(Pt 2):125-32 [20124692] Proc Natl Acad Sci U S A. 2010 Feb 23;107(8):3487-92 [20133726] Acta Crystallogr D Biol Crystallogr. 2010 Apr;66(Pt 4):486-501 [20383002] J Am Chem Soc. 2010 Jun 30;132(25):8657-68 [20524659] Annu Rev Cell Dev Biol. 2010;26:211-33 [20500090] PLoS One. 2010;5(12):e15801 [21203426] Proc Natl Acad Sci U S A. 2011 Mar 8;108(10):4194-9 [21325059] Nature. 2011 Jul 7;475(7354):96-100 [21677644] J Mol Biol. 2011 Aug 26;411(4):881-95 [21718702] Comment In: Mov Disord. 2016 Jan;31(1):44 [26748962] Nature. 2015 Sep 24;525(7570):458-9 [26352470] N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/nature15368 ER - TY - JOUR T1 - Architecture of the synaptotagmin-SNARE machinery for neuronal exocytosis. AN - 1709710304; 26280336 AB - Synaptotagmin-1 and neuronal SNARE proteins have central roles in evoked synchronous neurotransmitter release; however, it is unknown how they cooperate to trigger synaptic vesicle fusion. Here we report atomic-resolution crystal structures of Ca(2+)- and Mg(2+)-bound complexes between synaptotagmin-1 and the neuronal SNARE complex, one of which was determined with diffraction data from an X-ray free-electron laser, leading to an atomic-resolution structure with accurate rotamer assignments for many side chains. The structures reveal several interfaces, including a large, specific, Ca(2+)-independent and conserved interface. Tests of this interface by mutagenesis suggest that it is essential for Ca(2+)-triggered neurotransmitter release in mouse hippocampal neuronal synapses and for Ca(2+)-triggered vesicle fusion in a reconstituted system. We propose that this interface forms before Ca(2+) triggering, moves en bloc as Ca(2+) influx promotes the interactions between synaptotagmin-1 and the plasma membrane, and consequently remodels the membrane to promote fusion, possibly in conjunction with other interfaces. JF - Nature AU - Zhou, Qiangjun AU - Lai, Ying AU - Bacaj, Taulant AU - Zhao, Minglei AU - Lyubimov, Artem Y AU - Uervirojnangkoorn, Monarin AU - Zeldin, Oliver B AU - Brewster, Aaron S AU - Sauter, Nicholas K AU - Cohen, Aina E AU - Soltis, S Michael AU - Alonso-Mori, Roberto AU - Chollet, Matthieu AU - Lemke, Henrik T AU - Pfuetzner, Richard A AU - Choi, Ucheor B AU - Weis, William I AU - Diao, Jiajie AU - Südhof, Thomas C AU - Brunger, Axel T AD - Department of Molecular and Cellular Physiology, Howard Hughes Medical Institute, Stanford University, Stanford, California 94305, USA. ; Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. ; SLAC National Accelerator Laboratory, Stanford, California 94305, USA. ; Departments of Structural Biology, Molecular and Cellular Physiology, and Photon Science, Stanford University, Stanford, California 94305, USA. Y1 - 2015/09/03/ PY - 2015 DA - 2015 Sep 03 SP - 62 EP - 67 VL - 525 IS - 7567 KW - SNARE Proteins KW - 0 KW - Synaptotagmins KW - 134193-27-4 KW - Magnesium KW - I38ZP9992A KW - Calcium KW - SY7Q814VUP KW - Index Medicus KW - Animals KW - Electrons KW - Calcium -- chemistry KW - Models, Molecular KW - Synaptic Vesicles -- metabolism KW - Synaptic Vesicles -- chemistry KW - Mice KW - Models, Biological KW - Calcium -- metabolism KW - Magnesium -- metabolism KW - Membrane Fusion KW - Synaptic Vesicles -- secretion KW - Hippocampus -- cytology KW - Mutation -- genetics KW - Crystallography, X-Ray KW - Lasers KW - Binding Sites -- genetics KW - Cell Membrane -- metabolism KW - Synaptic Transmission KW - Magnesium -- chemistry KW - Synaptotagmins -- genetics KW - Neurons -- metabolism KW - SNARE Proteins -- chemistry KW - Neurons -- chemistry KW - Neurons -- cytology KW - Synaptotagmins -- chemistry KW - Exocytosis KW - SNARE Proteins -- genetics KW - Synaptotagmins -- metabolism KW - Neurons -- secretion KW - SNARE Proteins -- metabolism UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1709710304?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature&rft.atitle=Architecture+of+the+synaptotagmin-SNARE+machinery+for+neuronal+exocytosis.&rft.au=Zhou%2C+Qiangjun%3BLai%2C+Ying%3BBacaj%2C+Taulant%3BZhao%2C+Minglei%3BLyubimov%2C+Artem+Y%3BUervirojnangkoorn%2C+Monarin%3BZeldin%2C+Oliver+B%3BBrewster%2C+Aaron+S%3BSauter%2C+Nicholas+K%3BCohen%2C+Aina+E%3BSoltis%2C+S+Michael%3BAlonso-Mori%2C+Roberto%3BChollet%2C+Matthieu%3BLemke%2C+Henrik+T%3BPfuetzner%2C+Richard+A%3BChoi%2C+Ucheor+B%3BWeis%2C+William+I%3BDiao%2C+Jiajie%3BS%C3%BCdhof%2C+Thomas+C%3BBrunger%2C+Axel+T&rft.aulast=Zhou&rft.aufirst=Qiangjun&rft.date=2015-09-03&rft.volume=525&rft.issue=7567&rft.spage=62&rft.isbn=&rft.btitle=&rft.title=Nature&rft.issn=1476-4687&rft_id=info:doi/10.1038%2Fnature14975 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2015-10-01 N1 - Date created - 2015-09-03 N1 - Date revised - 2017-02-17 N1 - Genetic sequence - 5CCI; 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AN - 1700684450; 26200343 AB - G-protein-coupled receptors (GPCRs) signal primarily through G proteins or arrestins. Arrestin binding to GPCRs blocks G protein interaction and redirects signalling to numerous G-protein-independent pathways. Here we report the crystal structure of a constitutively active form of human rhodopsin bound to a pre-activated form of the mouse visual arrestin, determined by serial femtosecond X-ray laser crystallography. Together with extensive biochemical and mutagenesis data, the structure reveals an overall architecture of the rhodopsin-arrestin assembly in which rhodopsin uses distinct structural elements, including transmembrane helix 7 and helix 8, to recruit arrestin. Correspondingly, arrestin adopts the pre-activated conformation, with a ∼20° rotation between the amino and carboxy domains, which opens up a cleft in arrestin to accommodate a short helix formed by the second intracellular loop of rhodopsin. This structure provides a basis for understanding GPCR-mediated arrestin-biased signalling and demonstrates the power of X-ray lasers for advancing the frontiers of structural biology. JF - Nature AU - Kang, Yanyong AU - Zhou, X Edward AU - Gao, Xiang AU - He, Yuanzheng AU - Liu, Wei AU - Ishchenko, Andrii AU - Barty, Anton AU - White, Thomas A AU - Yefanov, Oleksandr AU - Han, Gye Won AU - Xu, Qingping AU - de Waal, Parker W AU - Ke, Jiyuan AU - Tan, M H Eileen AU - Zhang, Chenghai AU - Moeller, Arne AU - West, Graham M AU - Pascal, Bruce D AU - Van Eps, Ned AU - Caro, Lydia N AU - Vishnivetskiy, Sergey A AU - Lee, Regina J AU - Suino-Powell, Kelly M AU - Gu, Xin AU - Pal, Kuntal AU - Ma, Jinming AU - Zhi, Xiaoyong AU - Boutet, Sébastien AU - Williams, Garth J AU - Messerschmidt, Marc AU - Gati, Cornelius AU - Zatsepin, Nadia A AU - Wang, Dingjie AU - James, Daniel AU - Basu, Shibom AU - Roy-Chowdhury, Shatabdi AU - Conrad, Chelsie E AU - Coe, Jesse AU - Liu, Haiguang AU - Lisova, Stella AU - Kupitz, Christopher AU - Grotjohann, Ingo AU - Fromme, Raimund AU - Jiang, Yi AU - Tan, Minjia AU - Yang, Huaiyu AU - Li, Jun AU - Wang, Meitian AU - Zheng, Zhong AU - Li, Dianfan AU - Howe, Nicole AU - Zhao, Yingming AU - Standfuss, Jörg AU - Diederichs, Kay AU - Dong, Yuhui AU - Potter, Clinton S AU - Carragher, Bridget AU - Caffrey, Martin AU - Jiang, Hualiang AU - Chapman, Henry N AU - Spence, John C H AU - Fromme, Petra AU - Weierstall, Uwe AU - Ernst, Oliver P AU - Katritch, Vsevolod AU - Gurevich, Vsevolod V AU - Griffin, Patrick R AU - Hubbell, Wayne L AU - Stevens, Raymond C AU - Cherezov, Vadim AU - Melcher, Karsten AU - Xu, H Eric AD - Laboratory of Structural Sciences, Center for Structural Biology and Drug Discovery, Van Andel Research Institute, Grand Rapids, Michigan 49503, USA. ; Department of Chemistry and Biochemistry, and Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, Arizona 85287-1604, USA. ; Department of Chemistry, Bridge Institute, University of Southern California, Los Angeles, California 90089, USA. ; Center for Free Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany. ; Joint Center for Structural Genomics, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA. ; 1] Laboratory of Structural Sciences, Center for Structural Biology and Drug Discovery, Van Andel Research Institute, Grand Rapids, Michigan 49503, USA [2] Department of Obstetrics &Gynecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. ; The National Resource for Automated Molecular Microscopy, New York Structural Biology Center, New York, New York 10027, USA. ; Department of Molecular Therapeutics, The Scripps Research Institute, Scripps Florida, Jupiter, Florida 33458, USA. ; Jules Stein Eye Institute and Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA. ; Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada. ; Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232, USA. ; Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA. ; 1] Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] BioXFEL, NSF Science and Technology Center, 700 Ellicott Street, Buffalo, New York 14203, USA. ; 1] Department of Chemistry and Biochemistry, and Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, Arizona 85287-1604, USA [2] Department of Physics, Arizona State University, Tempe, Arizona 85287, USA. ; 1] Department of Chemistry and Biochemistry, and Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, Arizona 85287-1604, USA [2] Beijing Computational Science Research Center, Haidian District, Beijing 10084, China. ; 1] Department of Chemistry and Biochemistry, and Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, Arizona 85287-1604, USA [2] Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA. ; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. ; Department of Obstetrics &Gynecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. ; Swiss Light Source at Paul Scherrer Institute, CH-5232 Villigen, Switzerland. ; Department of Biological Sciences, Bridge Institute, University of Southern California, Los Angeles, California 90089, USA. ; School of Medicine and School of Biochemistry and Immunology, Trinity College, Dublin 2, Ireland. ; 1] BioXFEL, NSF Science and Technology Center, 700 Ellicott Street, Buffalo, New York 14203, USA [2] Ben May Department for Cancer Research, University of Chicago, Chicago, Illinois 60637, USA. ; Laboratory of Biomolecular Research at Paul Scherrer Institute, CH-5232 Villigen, Switzerland. ; Department of Biology, Universität Konstanz, 78457 Konstanz, Germany. ; Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China. ; 1] Center for Free Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany [2] Centre for Ultrafast Imaging, 22761 Hamburg, Germany. ; 1] Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada [2] Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada. ; 1] Department of Chemistry, Bridge Institute, University of Southern California, Los Angeles, California 90089, USA [2] Department of Biological Sciences, Bridge Institute, University of Southern California, Los Angeles, California 90089, USA [3] iHuman Institute, ShanghaiTech University, 2F Building 6, 99 Haike Road, Pudong New District, Shanghai 201210, China. ; 1] Laboratory of Structural Sciences, Center for Structural Biology and Drug Discovery, Van Andel Research Institute, Grand Rapids, Michigan 49503, USA [2] VARI-SIMM Center, Center for Structure and Function of Drug Targets, CAS-Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. Y1 - 2015/07/30/ PY - 2015 DA - 2015 Jul 30 SP - 561 EP - 567 VL - 523 IS - 7562 KW - Arrestin KW - 0 KW - Disulfides KW - Multiprotein Complexes KW - Rhodopsin KW - 9009-81-8 KW - Index Medicus KW - Animals KW - Reproducibility of Results KW - Models, Molecular KW - Humans KW - Multiprotein Complexes -- chemistry KW - Mice KW - Protein Binding KW - Disulfides -- metabolism KW - Binding Sites KW - Multiprotein Complexes -- biosynthesis KW - X-Rays KW - Disulfides -- chemistry KW - Crystallography, X-Ray KW - Lasers KW - Signal Transduction KW - Multiprotein Complexes -- metabolism KW - Arrestin -- metabolism KW - Rhodopsin -- metabolism KW - Rhodopsin -- chemistry KW - Arrestin -- chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700684450?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature&rft.atitle=Crystal+structure+of+rhodopsin+bound+to+arrestin+by+femtosecond+X-ray+laser.&rft.au=Kang%2C+Yanyong%3BZhou%2C+X+Edward%3BGao%2C+Xiang%3BHe%2C+Yuanzheng%3BLiu%2C+Wei%3BIshchenko%2C+Andrii%3BBarty%2C+Anton%3BWhite%2C+Thomas+A%3BYefanov%2C+Oleksandr%3BHan%2C+Gye+Won%3BXu%2C+Qingping%3Bde+Waal%2C+Parker+W%3BKe%2C+Jiyuan%3BTan%2C+M+H+Eileen%3BZhang%2C+Chenghai%3BMoeller%2C+Arne%3BWest%2C+Graham+M%3BPascal%2C+Bruce+D%3BVan+Eps%2C+Ned%3BCaro%2C+Lydia+N%3BVishnivetskiy%2C+Sergey+A%3BLee%2C+Regina+J%3BSuino-Powell%2C+Kelly+M%3BGu%2C+Xin%3BPal%2C+Kuntal%3BMa%2C+Jinming%3BZhi%2C+Xiaoyong%3BBoutet%2C+S%C3%A9bastien%3BWilliams%2C+Garth+J%3BMesserschmidt%2C+Marc%3BGati%2C+Cornelius%3BZatsepin%2C+Nadia+A%3BWang%2C+Dingjie%3BJames%2C+Daniel%3BBasu%2C+Shibom%3BRoy-Chowdhury%2C+Shatabdi%3BConrad%2C+Chelsie+E%3BCoe%2C+Jesse%3BLiu%2C+Haiguang%3BLisova%2C+Stella%3BKupitz%2C+Christopher%3BGrotjohann%2C+Ingo%3BFromme%2C+Raimund%3BJiang%2C+Yi%3BTan%2C+Minjia%3BYang%2C+Huaiyu%3BLi%2C+Jun%3BWang%2C+Meitian%3BZheng%2C+Zhong%3BLi%2C+Dianfan%3BHowe%2C+Nicole%3BZhao%2C+Yingming%3BStandfuss%2C+J%C3%B6rg%3BDiederichs%2C+Kay%3BDong%2C+Yuhui%3BPotter%2C+Clinton+S%3BCarragher%2C+Bridget%3BCaffrey%2C+Martin%3BJiang%2C+Hualiang%3BChapman%2C+Henry+N%3BSpence%2C+John+C+H%3BFromme%2C+Petra%3BWeierstall%2C+Uwe%3BErnst%2C+Oliver+P%3BKatritch%2C+Vsevolod%3BGurevich%2C+Vsevolod+V%3BGriffin%2C+Patrick+R%3BHubbell%2C+Wayne+L%3BStevens%2C+Raymond+C%3BCherezov%2C+Vadim%3BMelcher%2C+Karsten%3BXu%2C+H+Eric&rft.aulast=Kang&rft.aufirst=Yanyong&rft.date=2015-07-30&rft.volume=523&rft.issue=7562&rft.spage=561&rft.isbn=&rft.btitle=&rft.title=Nature&rft.issn=1476-4687&rft_id=info:doi/10.1038%2Fnature14656 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2015-08-20 N1 - Date created - 2015-07-30 N1 - Date revised - 2017-02-17 N1 - Genetic sequence - 4ZWJ; PDB N1 - SuppNotes - Cited By: Acta Crystallogr D Biol Crystallogr. 2010 Jan;66(Pt 1):12-21 [20057044] Acta Crystallogr D Biol Crystallogr. 2010 Feb;66(Pt 2):133-44 [20124693] Acta Crystallogr D Biol Crystallogr. 2010 Feb;66(Pt 2):213-21 [20124702] Acta Crystallogr D Biol Crystallogr. 2010 Apr;66(Pt 4):486-501 [20383002] Proteins. 2011 Feb;79(2):477-98 [21069716] J Biol Chem. 2011 Jan 14;286(2):1420-8 [20966068] Acta Crystallogr A. 2011 Mar;67(Pt 2):131-40 [21325716] Science. 2013 May 3;340(6132):615-9 [23519215] Acta Crystallogr D Biol Crystallogr. 2013 Jul;69(Pt 7):1231-40 [23793149] J Am Soc Mass Spectrom. 2013 Oct;24(10):1584-92 [23884631] Cell. 2013 Dec 5;155(6):1258-69 [24290358] Science. 2013 Dec 20;342(6165):1521-4 [24357322] Proc Natl Acad Sci U S A. 2014 Feb 4;111(5):1825-30 [24449856] Nat Commun. 2014;5:3309 [24525480] Nature. 2014 Aug 14;512(7513):218-22 [25043026] Nat Protoc. 2014 Sep;9(9):2123-34 [25122522] Acta Crystallogr D Biol Crystallogr. 2014 Sep;70(Pt 9):2430-43 [25195756] Cell. 2015 May 7;161(4):833-44 [25913193] Biomaterials. 2000 Feb;21(3):223-34 [10646938] Mol Cell. 2000 May;5(5):865-76 [10882122] Science. 2000 Aug 4;289(5480):739-45 [10926528] Proc Natl Acad Sci U S A. 2002 Oct 15;99(21):13419-24 [12370423] Nat Commun. 2012;3:995 [22871814] J Am Soc Mass Spectrom. 2012 Sep;23(9):1512-21 [22692830] Proc Natl Acad Sci U S A. 2012 Nov 6;109(45):18407-12 [23091036] Science. 2012 Dec 21;338(6114):1631-4 [23180774] Annu Rev Pharmacol Toxicol. 2013;53:531-56 [23140243] Proc Natl Acad Sci U S A. 2013 Jan 15;110(3):942-7 [23277586] Structure. 2013 Feb 5;21(2):229-35 [23290725] Proc Natl Acad Sci U S A. 2013 Mar 26;110(13):5004-9 [23476064] Nature. 2013 May 2;497(7447):142-6 [23604253] Nature. 2013 May 2;497(7447):137-41 [23604254] Science. 2013 May 3;340(6132):610-4 [23519210] Protein Sci. 1994 Dec;3(12):2428-34 [7756996] J Biol Chem. 1996 Jan 5;271(1):361-6 [8550587] Nature. 1998 Feb 26;391(6670):918-21 [9495348] Biochemistry. 1998 Jun 2;37(22):8253-61 [9609722] Annu Rev Biochem. 1998;67:653-92 [9759500] Chem Phys Lipids. 1998 Sep;95(1):11-21 [9807807] Protein Sci. 1999 Apr;8(4):921-9 [10211839] Cell. 1999 Apr 16;97(2):257-69 [10219246] Biochemistry. 1999 Jun 22;38(25):7938-44 [10387036] Structure. 2004 Dec;12(12):2113-24 [15576026] J Struct Biol. 2005 Jul;151(1):41-60 [15890530] Proc Natl Acad Sci U S A. 2006 Mar 28;103(13):4900-5 [16547131] Proc Natl Acad Sci U S A. 2007 Feb 27;104(9):3125-8 [17360618] EMBO J. 2007 Mar 21;26(6):1726-36 [17332750] J Biol Chem. 2007 May 18;282(20):14875-81 [17395586] J Mol Biol. 2007 Oct 5;372(5):1179-88 [17825322] Science. 2007 Nov 23;318(5854):1258-65 [17962520] Proc Natl Acad Sci U S A. 2008 Jan 8;105(1):64-9 [18165312] Structure. 2008 Mar;16(3):351-9 [18334210] Proc Natl Acad Sci U S A. 2008 May 27;105(21):7439-44 [18490656] Nat Protoc. 2008;3(6):977-90 [18536645] J Mol Biol. 2008 Jun 27;380(1):145-57 [18511075] Nature. 2008 Jul 10;454(7201):183-7 [18563085] Proc Natl Acad Sci U S A. 2008 Jul 8;105(27):9290-5 [18579772] Nature. 2008 Sep 25;455(7212):497-502 [18818650] Nature. 2003 Jan 9;421(6919):127-8 [12520290] Biochemistry. 2003 Feb 25;42(7):1995-2001 [12590586] Acta Crystallogr D Biol Crystallogr. 2003 Jul;59(Pt 7):1124-30 [12832754] Biochemistry. 2004 Mar 23;43(11):3137-51 [15023065] J Struct Biol. 2004 Nov;148(2):169-75 [15477097] Proc Natl Acad Sci U S A. 1986 Mar;83(5):1174-8 [3006038] J Biol Chem. 1993 Jun 5;268(16):11628-38 [8505295] Nature. 2011 Mar 31;471(7340):656-60 [21389983] Nature. 2011 Mar 31;471(7340):651-5 [21389988] Acta Crystallogr D Biol Crystallogr. 2011 Apr;67(Pt 4):271-81 [21460445] Acta Crystallogr D Biol Crystallogr. 2011 Apr;67(Pt 4):355-67 [21460454] Science. 2011 Apr 15;332(6027):322-7 [21393508] Nature. 2011 Sep 29;477(7366):549-55 [21772288] Prog Retin Eye Res. 2011 Nov;30(6):405-30 [21824527] Proc Natl Acad Sci U S A. 2011 Nov 15;108(46):18690-5 [22039220] Proc Natl Acad Sci U S A. 2012 Jan 3;109(1):119-24 [22198838] Annu Rev Pharmacol Toxicol. 2012;52:179-97 [21942629] Br J Pharmacol. 2012 Mar;165(6):1659-69 [22023017] Science. 2012 Mar 2;335(6072):1106-10 [22267580] Acta Pharmacol Sin. 2012 Mar;33(3):291-9 [22266727] Biochem Soc Trans. 2012 Apr;40(2):389-93 [22435817] Acta Crystallogr D Biol Crystallogr. 2012 Apr;68(Pt 4):454-67 [22505266] Science. 2012 May 25;336(6084):1030-3 [22628654] Science. 2012 Jul 20;337(6092):362-4 [22653729] J Struct Biol. 2009 Apr;166(1):95-102 [19263523] J Struct Biol. 2009 May;166(2):205-13 [19374019] Nat Protoc. 2009;4(5):706-31 [19390528] Protein Sci. 2009 May;18(5):893-908 [19384990] Comment In: Nature. 2015 Jul 30;523(7562):538-9 [26200346] Sci Data. 2016;3:160040 [27272251] N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/nature14656 ER - TY - JOUR T1 - Probing the role of interlayer coupling and coulomb interactions on electronic structure in few-layer MoSe₂ nanostructures. AN - 1672092371; 25775022 AB - Despite the weak nature of interlayer forces in transition metal dichalcogenide (TMD) materials, their properties are highly dependent on the number of layers in the few-layer two-dimensional (2D) limit. Here, we present a combined scanning tunneling microscopy/spectroscopy and GW theoretical study of the electronic structure of high quality single- and few-layer MoSe2 grown on bilayer graphene. We find that the electronic (quasiparticle) bandgap, a fundamental parameter for transport and optical phenomena, decreases by nearly one electronvolt when going from one layer to three due to interlayer coupling and screening effects. Our results paint a clear picture of the evolution of the electronic wave function hybridization in the valleys of both the valence and conduction bands as the number of layers is changed. This demonstrates the importance of layer number and electron-electron interactions on van der Waals heterostructures and helps to clarify how their electronic properties might be tuned in future 2D nanodevices. JF - Nano letters AU - Bradley, Aaron J AU - Ugeda, Miguel M AU - da Jornada, Felipe H AU - Qiu, Diana Y AU - Ruan, Wei AU - Zhang, Yi AU - Wickenburg, Sebastian AU - Riss, Alexander AU - Lu, Jiong AU - Mo, Sung-Kwan AU - Hussain, Zahid AU - Shen, Zhi-Xun AU - Louie, Steven G AU - Crommie, Michael F AD - †Department of Physics, University of California at Berkeley, Berkeley, California 94720, United States. ; ∥Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States. ; ⊥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States. Y1 - 2015/04/08/ PY - 2015 DA - 2015 Apr 08 SP - 2594 EP - 2599 VL - 15 IS - 4 KW - Chalcogens KW - 0 KW - Molybdenum KW - 81AH48963U KW - Selenium KW - H6241UJ22B KW - Index Medicus KW - STM/STS KW - transition metal dichalcogenide KW - screening KW - graphene KW - Coulomb interaction KW - quasiparticle bandgap KW - Static Electricity KW - Electron Transport KW - Materials Testing -- methods KW - Chalcogens -- chemistry KW - Selenium -- chemistry KW - Metal Nanoparticles -- chemistry KW - Metal Nanoparticles -- ultrastructure KW - Molybdenum -- chemistry KW - Molecular Probe Techniques UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1672092371?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nano+letters&rft.atitle=Probing+the+role+of+interlayer+coupling+and+coulomb+interactions+on+electronic+structure+in+few-layer+MoSe%E2%82%82+nanostructures.&rft.au=Bradley%2C+Aaron+J%3BUgeda%2C+Miguel+M%3Bda+Jornada%2C+Felipe+H%3BQiu%2C+Diana+Y%3BRuan%2C+Wei%3BZhang%2C+Yi%3BWickenburg%2C+Sebastian%3BRiss%2C+Alexander%3BLu%2C+Jiong%3BMo%2C+Sung-Kwan%3BHussain%2C+Zahid%3BShen%2C+Zhi-Xun%3BLouie%2C+Steven+G%3BCrommie%2C+Michael+F&rft.aulast=Bradley&rft.aufirst=Aaron&rft.date=2015-04-08&rft.volume=15&rft.issue=4&rft.spage=2594&rft.isbn=&rft.btitle=&rft.title=Nano+letters&rft.issn=1530-6992&rft_id=info:doi/10.1021%2Facs.nanolett.5b00160 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2016-04-05 N1 - Date created - 2015-04-08 N1 - Date revised - 2017-02-17 N1 - SuppNotes - Cited By: Nat Nanotechnol. 2012 Aug;7(8):494-8 [22706698] Nat Nanotechnol. 2012 Aug;7(8):490-3 [22706701] Nano Lett. 2014 May 14;14(5):2443-7 [24783945] Rev Sci Instrum. 2007 Jan;78(1):013705 [17503926] Nat Commun. 2012;3:887 [22673914] Nano Lett. 2012 Sep 12;12(9):4674-80 [22862813] N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1021/acs.nanolett.5b00160 ER - TY - JOUR T1 - Tuning complex transition metal hydroxide nanostructures as active catalysts for water oxidation by a laser-chemical route. AN - 1672090479; 25723892 AB - Diverse transition metal hydroxide nanostructures were synthesized by laser-induced hydrolysis in a liquid precursor solution for alkaline oxygen evolution reaction (OER). Several active OER catalysts with fine control of composition, structure, and valence state were obtained including (Lix)[Ni0.66Mn0.34(OH)2](NO3)(CO3) · mH2O, Lix[Ni0.67Co0.33(OH)2](NO3)0.25(ORO)0.35 · mH2O, etc. An operate overpotential less than 0.34 V at current density of 10 mA cm(-2) was achieved. Such a controllable laser-chemical route for assessing complex nanostructures in liquids opens many opportunities to design novel functional materials for advanced applications. JF - Nano letters AU - Niu, Kai-Yang AU - Lin, Feng AU - Jung, Suho AU - Fang, Liang AU - Nordlund, Dennis AU - McCrory, Charles C L AU - Weng, Tsu-Chien AU - Ercius, Peter AU - Doeff, Marca M AU - Zheng, Haimei AD - ⊥Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, California 91125, United States. ; ¶State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 400044, People's Republic of China. ; ∥Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States. ; #Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States. Y1 - 2015/04/08/ PY - 2015 DA - 2015 Apr 08 SP - 2498 EP - 2503 VL - 15 IS - 4 KW - Transition metal hydroxides KW - electrocatalysis KW - three-dimensional catalyst KW - volume activity KW - laser chemistry KW - water oxidation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1672090479?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nano+letters&rft.atitle=Tuning+complex+transition+metal+hydroxide+nanostructures+as+active+catalysts+for+water+oxidation+by+a+laser-chemical+route.&rft.au=Niu%2C+Kai-Yang%3BLin%2C+Feng%3BJung%2C+Suho%3BFang%2C+Liang%3BNordlund%2C+Dennis%3BMcCrory%2C+Charles+C+L%3BWeng%2C+Tsu-Chien%3BErcius%2C+Peter%3BDoeff%2C+Marca+M%3BZheng%2C+Haimei&rft.aulast=Niu&rft.aufirst=Kai-Yang&rft.date=2015-04-08&rft.volume=15&rft.issue=4&rft.spage=2498&rft.isbn=&rft.btitle=&rft.title=Nano+letters&rft.issn=1530-6992&rft_id=info:doi/10.1021%2Facs.nanolett.5b00026 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2015-09-15 N1 - Date created - 2015-04-08 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1021/acs.nanolett.5b00026 ER - TY - JOUR T1 - Copper sorption by the edge surfaces of synthetic birnessite nanoparticles AN - 1680753038; 2015-041851 AB - We investigated the sorption of Cu by delta -MnO (sub 2) , an analog for natural birnessite (layer-type Mn oxide) that is characterized by randomly stacked and curled nanosheets, a low to moderate vacancy content, and variable amounts of layer and interlayer Mn (super 3 +) . The synthetic delta -MnO (sub 2) used in this study had a Na:Mn molar ratio of 0.13, an average manganese oxidation number (AMON) of 3.85 after reaction, a specific surface area of 254 m (super 2) g (super - 1) and a particle size of 2-4 nm in the ab plane. The maximum surface excess (q (sub max) ) value at pH 6 estimated from sorption data of 0.72 (0.64-0.83, 95% confidence interval) mol Cu mol (super - 1) Mn far exceeded the nominal vacancy content for delta -MnO (sub 2) (ca. 6-11% mol vacancy mol (super - 1) Mn), thus implicating multiple binding sites for Cu. The large values of q (sub max) and specific surface area of the mineral suggest a major role for surface sites at the particle edges relative to vacancy sites. The extended X-ray absorption fine structure (EXAFS) spectra from delta -MnO (sub 2) samples differ with respect to the EXAFS spectra for Cu(OH) (sub 2) , CuO, and Cu (sub 3) (CO (sub 3) ) (sub 2) (OH) (sub 2) and Cu-sorbed by biogenic MnO (sub 2) . The Cu K-edge EXAFS spectra show two second-shell peaks that can be modeled with Mn and Cu near-neighbors. Copper appears to bind dominantly at particle edges of delta -MnO (sub 2) as dimers or polynuclear surface species. This sorption mechanism is consistent with the moderate vacancy content of delta -MnO (sub 2) and explains the similarity in the EXAFS spectra from samples having surface loadings of 0.01 to 0.26 mol Cu mol (super - 1) Mn. The strong proclivity of Cu to bind on the edge surfaces of nanoparticulate birnessite leads to very large surface excesses of Cu without the formation of a discreet precipitate, making the surface sites at the particle edges the dominant sorption site for Cu. Abstract Copyright (2015) Elsevier, B.V. JF - Chemical Geology AU - Pena, Jasquelin AU - Bargar, John R AU - Sposito, Garrison Y1 - 2015/03/09/ PY - 2015 DA - 2015 Mar 09 SP - 196 EP - 207 PB - Elsevier, Amsterdam VL - 396 SN - 0009-2541, 0009-2541 KW - sorption KW - copper KW - polymerization KW - remediation KW - XANES spectra KW - reactivity KW - manganese oxides KW - oxides KW - spectra KW - water pollution KW - synthetic materials KW - surface properties KW - experimental studies KW - pollutants KW - pollution KW - adsorption KW - X-ray spectra KW - models KW - isotherms KW - birnessite KW - soil pollution KW - metals KW - EXAFS data KW - crystal chemistry KW - nanoparticles KW - land use KW - 22:Environmental geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680753038?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Chemical+Geology&rft.atitle=Copper+sorption+by+the+edge+surfaces+of+synthetic+birnessite+nanoparticles&rft.au=Pena%2C+Jasquelin%3BBargar%2C+John+R%3BSposito%2C+Garrison&rft.aulast=Pena&rft.aufirst=Jasquelin&rft.date=2015-03-09&rft.volume=396&rft.issue=&rft.spage=196&rft.isbn=&rft.btitle=&rft.title=Chemical+Geology&rft.issn=00092541&rft_id=info:doi/10.1016%2Fj.chemgeo.2014.12.021 L2 - http://www.sciencedirect.com/science/journal/00092541 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2015-01-01 N1 - Number of references - 66 N1 - Document feature - illus. incl. 2 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2016-10-25 N1 - CODEN - CHGEAD N1 - SubjectsTermNotLitGenreText - adsorption; birnessite; copper; crystal chemistry; EXAFS data; experimental studies; isotherms; land use; manganese oxides; metals; models; nanoparticles; oxides; pollutants; pollution; polymerization; reactivity; remediation; soil pollution; sorption; spectra; surface properties; synthetic materials; water pollution; X-ray spectra; XANES spectra DO - http://dx.doi.org/10.1016/j.chemgeo.2014.12.021 ER - TY - CPAPER T1 - Understanding How Batteries Really Work: Insight from In Operando Investigations T2 - 2015 Annual Meeting of the American Association for the Advancement of Science (AAAS 2015) AN - 1658699777; 6338783 JF - 2015 Annual Meeting of the American Association for the Advancement of Science (AAAS 2015) AU - Toney, Michael Y1 - 2015/02/12/ PY - 2015 DA - 2015 Feb 12 KW - Batteries UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1658699777?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2015+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2015%29&rft.atitle=Understanding+How+Batteries+Really+Work%3A+Insight+from+In+Operando+Investigations&rft.au=Toney%2C+Michael&rft.aulast=Toney&rft.aufirst=Michael&rft.date=2015-02-12&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2015+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2015%29&rft.issn=&rft_id=info:doi/ L2 - https://aaas.confex.com/aaas/2015/webprogram/meeting2015-02-11.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-02-28 N1 - Last updated - 2015-02-27 ER - TY - CPAPER T1 - X-Ray Laser Research: Lighting Our Future T2 - 2015 Annual Meeting of the American Association for the Advancement of Science (AAAS 2015) AN - 1658698459; 6338475 JF - 2015 Annual Meeting of the American Association for the Advancement of Science (AAAS 2015) AU - Bergmann, Uwe Y1 - 2015/02/12/ PY - 2015 DA - 2015 Feb 12 KW - Ionizing radiation KW - Lighting KW - Lasers UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1658698459?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2015+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2015%29&rft.atitle=X-Ray+Laser+Research%3A+Lighting+Our+Future&rft.au=Bergmann%2C+Uwe&rft.aulast=Bergmann&rft.aufirst=Uwe&rft.date=2015-02-12&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2015+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2015%29&rft.issn=&rft_id=info:doi/ L2 - https://aaas.confex.com/aaas/2015/webprogram/meeting2015-02-11.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-02-28 N1 - Last updated - 2015-02-27 ER - TY - CPAPER T1 - Examples of Computer-Aided Catalyst Design T2 - 2015 Annual Meeting of the American Association for the Advancement of Science (AAAS 2015) AN - 1658698437; 6338708 JF - 2015 Annual Meeting of the American Association for the Advancement of Science (AAAS 2015) AU - Bligaard, Thomas Y1 - 2015/02/12/ PY - 2015 DA - 2015 Feb 12 KW - Catalysts UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1658698437?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2015+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2015%29&rft.atitle=Examples+of+Computer-Aided+Catalyst+Design&rft.au=Bligaard%2C+Thomas&rft.aulast=Bligaard&rft.aufirst=Thomas&rft.date=2015-02-12&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2015+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2015%29&rft.issn=&rft_id=info:doi/ L2 - https://aaas.confex.com/aaas/2015/webprogram/meeting2015-02-11.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-02-28 N1 - Last updated - 2015-02-27 ER - TY - CPAPER T1 - Linac Coherent Light Source: Probing the Ultra-Small and Capturing the Ultra-Fast T2 - 2015 Annual Meeting of the American Association for the Advancement of Science (AAAS 2015) AN - 1658696789; 6338774 JF - 2015 Annual Meeting of the American Association for the Advancement of Science (AAAS 2015) AU - Holtkamp, Norbert Y1 - 2015/02/12/ PY - 2015 DA - 2015 Feb 12 KW - Light sources KW - Light effects UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1658696789?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2015+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2015%29&rft.atitle=Linac+Coherent+Light+Source%3A+Probing+the+Ultra-Small+and+Capturing+the+Ultra-Fast&rft.au=Holtkamp%2C+Norbert&rft.aulast=Holtkamp&rft.aufirst=Norbert&rft.date=2015-02-12&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2015+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2015%29&rft.issn=&rft_id=info:doi/ L2 - https://aaas.confex.com/aaas/2015/webprogram/meeting2015-02-11.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-02-28 N1 - Last updated - 2015-02-27 ER - TY - JOUR T1 - Microscale X-ray spectroscopic imaging as a tool to examine complex diagenetic processes AN - 1800395289; 2016-057319 JF - V.M. Goldschmidt Conference - Program and Abstracts AU - Webb, Samuel M AU - Roach, Courtney M AU - Anonymous Y1 - 2015 PY - 2015 DA - 2015 SP - 3372 PB - Goldschmidt Conference, [varies] VL - 25 SN - 1042-7287, 1042-7287 KW - technology KW - ion probe data KW - mass spectra KW - electron microscopy data KW - sedimentary rocks KW - diagenesis KW - X-ray spectroscopy KW - X-ray analysis KW - spectra KW - spectroscopy KW - geochemistry KW - SEM data KW - Eh KW - 06A:Sedimentary petrology KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1800395289?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.atitle=Microscale+X-ray+spectroscopic+imaging+as+a+tool+to+examine+complex+diagenetic+processes&rft.au=Webb%2C+Samuel+M%3BRoach%2C+Courtney+M%3BAnonymous&rft.aulast=Webb&rft.aufirst=Samuel&rft.date=2015-01-01&rft.volume=25&rft.issue=&rft.spage=3372&rft.isbn=&rft.btitle=&rft.title=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.issn=10427287&rft_id=info:doi/ L2 - http://goldschmidt.info/2015/uploads/abstracts/finalPDFs/3372.pdf LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2015 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Last updated - 2016-06-30 N1 - SubjectsTermNotLitGenreText - diagenesis; Eh; electron microscopy data; geochemistry; ion probe data; mass spectra; sedimentary rocks; SEM data; spectra; spectroscopy; technology; X-ray analysis; X-ray spectroscopy ER - TY - JOUR T1 - Characterization and impact of organic-rich sediments on uranium behavior in the Rifle Aquifer, CO AN - 1797532068; 2016-049933 JF - V.M. Goldschmidt Conference - Program and Abstracts AU - Janot, Noemie AU - Pacheco, Juan S Lezama AU - Pham, Don Q AU - O'Brien, Tim M AU - Hausladen, Debra AU - Williams, Kenneth H AU - Long, Philip E AU - Fendorf, Scott AU - Bargar, John R AU - Anonymous Y1 - 2015 PY - 2015 DA - 2015 SP - 1419 PB - Goldschmidt Conference, [varies] VL - 25 SN - 1042-7287, 1042-7287 KW - United States KW - Colorado River basin KW - Garfield County Colorado KW - behavior KW - characterization KW - cores KW - variations KW - ground water KW - XANES spectra KW - Rifle Colorado KW - chemical reactions KW - carbon KW - sediments KW - spectra KW - reduction KW - organic carbon KW - water pollution KW - pollutants KW - biochemistry KW - pollution KW - X-ray spectra KW - geochemical cycle KW - aquifers KW - organic compounds KW - metals KW - uranium KW - Colorado KW - actinides KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1797532068?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.atitle=Characterization+and+impact+of+organic-rich+sediments+on+uranium+behavior+in+the+Rifle+Aquifer%2C+CO&rft.au=Janot%2C+Noemie%3BPacheco%2C+Juan+S+Lezama%3BPham%2C+Don+Q%3BO%27Brien%2C+Tim+M%3BHausladen%2C+Debra%3BWilliams%2C+Kenneth+H%3BLong%2C+Philip+E%3BFendorf%2C+Scott%3BBargar%2C+John+R%3BAnonymous&rft.aulast=Janot&rft.aufirst=Noemie&rft.date=2015-01-01&rft.volume=25&rft.issue=&rft.spage=1419&rft.isbn=&rft.btitle=&rft.title=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.issn=10427287&rft_id=info:doi/ L2 - http://goldschmidt.info/2015/uploads/abstracts/finalPDFs/1419.pdf LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2015 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Last updated - 2016-06-17 N1 - SubjectsTermNotLitGenreText - actinides; aquifers; behavior; biochemistry; carbon; characterization; chemical reactions; Colorado; Colorado River basin; cores; Garfield County Colorado; geochemical cycle; ground water; metals; organic carbon; organic compounds; pollutants; pollution; reduction; Rifle Colorado; sediments; spectra; United States; uranium; variations; water pollution; X-ray spectra; XANES spectra ER - TY - JOUR T1 - Regional importance of organic-rich sediments to uranium mobility in the upper Colorado River basin AN - 1789751880; 2016-042075 JF - V.M. Goldschmidt Conference - Program and Abstracts AU - Noel, V AU - Bargar, J R AU - Boye, K AU - Cardarelli, E AU - Bone, S E AU - Lezama-Pacheco, J S AU - Williams, K AU - Dam, B AU - Bush, R AU - Dayvault, J AU - Linard, J AU - Kautsky, M AU - Johnson, R AU - Goodknight, C AU - Anonymous Y1 - 2015 PY - 2015 DA - 2015 SP - 2284 PB - Goldschmidt Conference, [varies] VL - 25 SN - 1042-7287, 1042-7287 KW - United States KW - Colorado River basin KW - Garfield County Colorado KW - contaminant plumes KW - pollutants KW - floodplains KW - pollution KW - ground water KW - Rifle Colorado KW - organic compounds KW - total organic carbon KW - metals KW - sediments KW - fluvial features KW - X-ray fluorescence spectra KW - uranium KW - spectra KW - Colorado KW - water pollution KW - actinides KW - pore water KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1789751880?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.atitle=Regional+importance+of+organic-rich+sediments+to+uranium+mobility+in+the+upper+Colorado+River+basin&rft.au=Noel%2C+V%3BBargar%2C+J+R%3BBoye%2C+K%3BCardarelli%2C+E%3BBone%2C+S+E%3BLezama-Pacheco%2C+J+S%3BWilliams%2C+K%3BDam%2C+B%3BBush%2C+R%3BDayvault%2C+J%3BLinard%2C+J%3BKautsky%2C+M%3BJohnson%2C+R%3BGoodknight%2C+C%3BAnonymous&rft.aulast=Noel&rft.aufirst=V&rft.date=2015-01-01&rft.volume=25&rft.issue=&rft.spage=2284&rft.isbn=&rft.btitle=&rft.title=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.issn=10427287&rft_id=info:doi/ L2 - http://goldschmidt.info/2015/uploads/abstracts/finalPDFs/2284.pdf LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2015 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 2 N1 - Last updated - 2016-05-19 N1 - SubjectsTermNotLitGenreText - actinides; Colorado; Colorado River basin; contaminant plumes; floodplains; fluvial features; Garfield County Colorado; ground water; metals; organic compounds; pollutants; pollution; pore water; Rifle Colorado; sediments; spectra; total organic carbon; United States; uranium; water pollution; X-ray fluorescence spectra ER - TY - JOUR T1 - Uranium biogeochemistry; nanometer to regional scales AN - 1756505198; 2016-007051 JF - V.M. Goldschmidt Conference - Program and Abstracts AU - Bargar, J R AU - Williams, Kenneth H AU - Bone, S E AU - Boye, K AU - Janot, N AU - Noel, V AU - Anonymous Y1 - 2015 PY - 2015 DA - 2015 SP - 209 PB - Goldschmidt Conference, [varies] VL - 25 SN - 1042-7287, 1042-7287 KW - United States KW - processes KW - diffusion KW - Colorado River basin KW - Garfield County Colorado KW - biochemistry KW - behavior KW - pollution KW - ground water KW - spatial distribution KW - Rifle Colorado KW - reactivity KW - organic compounds KW - metals KW - sediments KW - uranium KW - Colorado KW - water pollution KW - actinides KW - Eh KW - chemical fractionation KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1756505198?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.atitle=Uranium+biogeochemistry%3B+nanometer+to+regional+scales&rft.au=Bargar%2C+J+R%3BWilliams%2C+Kenneth+H%3BBone%2C+S+E%3BBoye%2C+K%3BJanot%2C+N%3BNoel%2C+V%3BAnonymous&rft.aulast=Bargar&rft.aufirst=J&rft.date=2015-01-01&rft.volume=25&rft.issue=&rft.spage=209&rft.isbn=&rft.btitle=&rft.title=V.M.+Goldschmidt+Conference+-+Program+and+Abstracts&rft.issn=10427287&rft_id=info:doi/ L2 - http://goldschmidt.info/2015/uploads/abstracts/finalPDFs/209.pdf LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2015 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Last updated - 2016-01-14 N1 - SubjectsTermNotLitGenreText - actinides; behavior; biochemistry; chemical fractionation; Colorado; Colorado River basin; diffusion; Eh; Garfield County Colorado; ground water; metals; organic compounds; pollution; processes; reactivity; Rifle Colorado; sediments; spatial distribution; United States; uranium; water pollution ER - TY - JOUR T1 - Discovering the Future of the Web AN - 1683500907 AB - The 2014 brought the 25th anniversary of the World Wide Web. There is general agreement that it represents one of the most influential software applications in history and has transformed many diverse elements of human interaction. The global impact of the Web would naturally lead to speculation about the future of the technology and attempts to understand what has driven its evolution in the past and what will do so in the future. The definition of Web Science and its implementation in Web Observatories provide a viable mechanism for a more complete understanding of the technology and a paradigm for directing its future. Web Science also provides a powerful multi-disciplinary framework and compelling research opportunities. JF - Journal of Computing and Information Technology AU - White, Bebo AD - SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California, USA ; SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California, USA Y1 - 2015 PY - 2015 DA - 2015 SP - 87 EP - 93 CY - Zagreb PB - University of Zagreb, University Computing Centre VL - 23 IS - 1 SN - 1330-1136 KW - Computers KW - Future Web KW - Web Science KW - Web Observatory KW - Social Web KW - Data Web KW - Web Engineering KW - Anniversaries KW - World Wide Web KW - 14.11:COMMUNICATIONS AND INFORMATION TECHNOLOGY - NETWORKS UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1683500907?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Computing+and+Information+Technology&rft.atitle=Discovering+the+Future+of+the+Web&rft.au=White%2C+Bebo&rft.aulast=White&rft.aufirst=Bebo&rft.date=2015-01-01&rft.volume=23&rft.issue=1&rft.spage=87&rft.isbn=&rft.btitle=&rft.title=Journal+of+Computing+and+Information+Technology&rft.issn=13301136&rft_id=info:doi/10.2498%2Fcit.1002516 LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2015-05-01 N1 - Last updated - 2016-05-12 DO - http://dx.doi.org/10.2498/cit.1002516 ER - TY - JOUR T1 - Plasmon-induced hot carrier science and technology. AN - 1658705782; 25559968 AB - The discovery of the photoelectric effect by Heinrich Hertz in 1887 set the foundation for over 125 years of hot carrier science and technology. In the early 1900s it played a critical role in the development of quantum mechanics, but even today the unique properties of these energetic, hot carriers offer new and exciting opportunities for fundamental research and applications. Measurement of the kinetic energy and momentum of photoejected hot electrons can provide valuable information on the electronic structure of materials. The heat generated by hot carriers can be harvested to drive a wide range of physical and chemical processes. Their kinetic energy can be used to harvest solar energy or create sensitive photodetectors and spectrometers. Photoejected charges can also be used to electrically dope two-dimensional materials. Plasmon excitations in metallic nanostructures can be engineered to enhance and provide valuable control over the emission of hot carriers. This Review discusses recent advances in the understanding and application of plasmon-induced hot carrier generation and highlights some of the exciting new directions for the field. JF - Nature nanotechnology AU - Brongersma, Mark L AU - Halas, Naomi J AU - Nordlander, Peter AD - 1] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA [2] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA. ; Laboratory for Nanophotonics, Department of Electrical and Computer Engineering, Department of Physics and Astronomy, and Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, USA. Y1 - 2015/01// PY - 2015 DA - January 2015 SP - 25 EP - 34 VL - 10 IS - 1 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1658705782?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+nanotechnology&rft.atitle=Plasmon-induced+hot+carrier+science+and+technology.&rft.au=Brongersma%2C+Mark+L%3BHalas%2C+Naomi+J%3BNordlander%2C+Peter&rft.aulast=Brongersma&rft.aufirst=Mark&rft.date=2015-01-01&rft.volume=10&rft.issue=1&rft.spage=25&rft.isbn=&rft.btitle=&rft.title=Nature+nanotechnology&rft.issn=1748-3395&rft_id=info:doi/10.1038%2Fnnano.2014.311 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2015-06-04 N1 - Date created - 2015-01-06 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/nnano.2014.311 ER - TY - CPAPER T1 - Micro-scale Complexity in Iron-Sulfide Phases in Precambrian Sedimentary Rocks Determined by Synchrotron Microprobe Spectroscopy T2 - 47th American Geophysical Union Fall Meeting AN - 1651740015; 6329360 JF - 47th American Geophysical Union Fall Meeting AU - Webb, Samuel AU - Johnson, Jena AU - Slotznick, Sarah AU - Roach, Courtney AU - Fischer, Woodward Y1 - 2014/12/15/ PY - 2014 DA - 2014 Dec 15 KW - Precambrian KW - Sedimentary rocks KW - Spectroscopy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1651740015?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=47th+American+Geophysical+Union+Fall+Meeting&rft.atitle=Micro-scale+Complexity+in+Iron-Sulfide+Phases+in+Precambrian+Sedimentary+Rocks+Determined+by+Synchrotron+Microprobe+Spectroscopy&rft.au=Webb%2C+Samuel%3BJohnson%2C+Jena%3BSlotznick%2C+Sarah%3BRoach%2C+Courtney%3BFischer%2C+Woodward&rft.aulast=Webb&rft.aufirst=Samuel&rft.date=2014-12-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=47th+American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - https://agu.confex.com/agu/fm14/meetingapp.cgi#ModuleSessionsByDay/0 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-01-31 N1 - Last updated - 2015-02-06 ER - TY - CPAPER T1 - Uranium(IV) Complexation by Natural Organic Matter Controls Speciation in the Subsurface T2 - 47th American Geophysical Union Fall Meeting AN - 1651738480; 6328611 JF - 47th American Geophysical Union Fall Meeting AU - Bone, Sharon AU - Dynes, James AU - Fendorf, Scott AU - Jones, Morris AU - Bargar, John Y1 - 2014/12/15/ PY - 2014 DA - 2014 Dec 15 KW - Speciation KW - Uranium KW - Organic matter UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1651738480?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=47th+American+Geophysical+Union+Fall+Meeting&rft.atitle=Uranium%28IV%29+Complexation+by+Natural+Organic+Matter+Controls+Speciation+in+the+Subsurface&rft.au=Bone%2C+Sharon%3BDynes%2C+James%3BFendorf%2C+Scott%3BJones%2C+Morris%3BBargar%2C+John&rft.aulast=Bone&rft.aufirst=Sharon&rft.date=2014-12-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=47th+American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - https://agu.confex.com/agu/fm14/meetingapp.cgi#ModuleSessionsByDay/0 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-01-31 N1 - Last updated - 2015-02-06 ER - TY - JOUR T1 - 3D spectroscopic X-ray imaging with nanoscale resolution at extreme conditions AN - 1729846424; 2015-106135 AB - Coupling nanoscale x-ray computed tomography (nanoXCT) with a diamond anvil cell has exciting potential as a powerful 3D probe for non-destructive imaging at high spatial resolution of multiple crystalline and amorphous phases which are synthesized under extreme conditions. The ability to also tune the incident energy range allows access elemental edges for spectroscopic imaging to map coordination and oxidation state, and provide quantitative composition information within the sample. Results from quenched high pressure-temperature experiments and in-situ high pressure measurements which illustrate the potential for this technique will be presented. JF - American Geophysical Union Fall Meeting AU - Mao, W L AU - Lin, Y AU - Liu, Yijin AU - Shi, C Yinxia AU - Yang, W AU - Anonymous Y1 - 2014/12// PY - 2014 DA - December 2014 SP - Abstract MR13A EP - 01 PB - American Geophysical Union, Washington, DC VL - 2014 KW - 17B:Geophysics of minerals and rocks UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1729846424?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=3D+spectroscopic+X-ray+imaging+with+nanoscale+resolution+at+extreme+conditions&rft.au=Mao%2C+W+L%3BLin%2C+Y%3BLiu%2C+Yijin%3BShi%2C+C+Yinxia%3BYang%2C+W%3BAnonymous&rft.aulast=Mao&rft.aufirst=W&rft.date=2014-12-01&rft.volume=2014&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2014 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-11-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Micro-scale complexity in iron-sulfide phases in Precambrian sedimentary rocks determined by synchrotron microprobe spectroscopy AN - 1729846103; 2015-106138 AB - The record of sedimentary pyrite forms the foundation for most isotope records working to define the coupled evolution and behavior of the ancient iron and sulfur cycles. In order to assess the strengths and limitations of records derived from pyrite-rich rocks (e.g. iron speciation, sulfur isotope ratios), we need to understand more about the processes that form and alter sedimentary pyrite. From samples of the Archean/early Proterozoic Transvaal and middle Proterozoic Belt Supergroups, petrography reveals that what might operationally be called sedimentary pyrite has complex textures that hint at a rich process history of sulfur mineralization. A common limitation of virtually all proxy measurements employed to date is that they operate on 'bulk' samples, typically gram-sized or larger pieces. As such, they lose the ability to relate geochemistry to petrography at the scale of mineral grains. Many of the sedimentary pyrites in the Transvaal Supergroup exhibit complex redox and electronic structures of S and Fe, with crystals of pyrite, pyrrhotite, and sulfate-bearing minerals throughout. Parallel application of multiple techniques on the same samples across micron bases spatial scales, provide an opportunity to diagnose issues resulting from post-depositional alteration of sedimentary rocks. We have integrated light and electron microscopy for petrography, electron microprobe and synchrotron XRF for elemental composition, synchrotron X-ray spectroscopy for redox and chemical state, and secondary ion mass spectrometry (SIMS) for isotopic composition. The coupling of these tools allows in essence "images" of the proxy data at the micrometer scale, giving a wide array of textural and mineralogical information designed to inform and untangle the complicated histories of these early Precambrian rocks. JF - American Geophysical Union Fall Meeting AU - Webb, Sam AU - Johnson, J E AU - Slotznick, S P AU - Roach, C AU - Fischer, W W AU - Anonymous Y1 - 2014/12// PY - 2014 DA - December 2014 SP - Abstract MR13A EP - 04 PB - American Geophysical Union, Washington, DC VL - 2014 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1729846103?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Micro-scale+complexity+in+iron-sulfide+phases+in+Precambrian+sedimentary+rocks+determined+by+synchrotron+microprobe+spectroscopy&rft.au=Webb%2C+Sam%3BJohnson%2C+J+E%3BSlotznick%2C+S+P%3BRoach%2C+C%3BFischer%2C+W+W%3BAnonymous&rft.aulast=Webb&rft.aufirst=Sam&rft.date=2014-12-01&rft.volume=2014&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2014 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-11-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Uranium(IV) complexation by natural organic matter controls speciation in the subsurface AN - 1718051812; 2015-092499 AB - Uranium contaminates groundwater at many sites throughout the United States. At the aquifer in Rifle, CO, U(IV) has been found to accumulate in natural organic matter (NOM)-rich sediments comprising buried alluvial material. We expect that NOM, which is composed of detrital plant material and microbial biomass and necromass, profoundly influences the speciation of U(IV). Specifically, we hypothesize that NOM forms stable complexes with U(IV) (i.e., "noncrystalline" U(IV)), particularly through organic phosphorus moieties associated with bacteria and exopolymeric substances (EPS). Complexation with NOM can help to explain why noncrystalline U(IV) is more abundant in the subsurface than the mineral uraninite (UO2). The abundance and relative reactivity of non-crystalline U(IV) suggests that it drives U fate and transport in the subsurface. W are examining the reduction of U(VI) and subsequent complexation of U(IV) in model NOM systems comprising homogenized, partially degraded plant material, which is analogous to the detrital plant material abundant in Rifle sediments, and its associated microbial consortia. We employ a suite of spectroscopic (X-ray absorption spectroscopies) and microscopic (scanning transmission X-ray microscopy, scanning electron microscopy, and nano-scale secondary ion mass spectrometry) tools that allow us to identify the number and types of coordinating ligands and the distribution of U with respect to NOM components, including bacterial cells, plant matter and entrained minerals. In preliminary experiments we found that 50-100% of U(VI) was reduced to U(IV) within several days. Furthermore, NOM was observed to sorb both U(VI), as a carbonyl complex, and U(IV), possibly as a phosphoryl complex. Further microscopic analyses are designed to elucidate whether U(IV)-P complexes are associated with bacteria or EPS. Our research suggests a new, more complicated model for U(IV) speciation in subsurface sediments, in which complexation by NOM, as opposed to mineral formation, controls U reactivity. JF - American Geophysical Union Fall Meeting AU - Bone, S H AU - Dynes, James AU - Fendorf, S E AU - Jones, M E AU - Bargar, J AU - Anonymous Y1 - 2014/12// PY - 2014 DA - December 2014 SP - Abstract B12A EP - 04 PB - American Geophysical Union, Washington, DC VL - 2014 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1718051812?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Uranium%28IV%29+complexation+by+natural+organic+matter+controls+speciation+in+the+subsurface&rft.au=Bone%2C+S+H%3BDynes%2C+James%3BFendorf%2C+S+E%3BJones%2C+M+E%3BBargar%2C+J%3BAnonymous&rft.aulast=Bone&rft.aufirst=S&rft.date=2014-12-01&rft.volume=2014&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2014 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-10-01 N1 - CODEN - #07548 ER - TY - JOUR T1 - High-resolution synchrotron radiation imaging of trace metal elemental concentrations in Porites coral AN - 1718050461; 2015-092735 AB - We investigated the use of synchrotron radiation for elemental imaging within the skeleton of a Porites coral from American Samoa to explore the fine-scale structure of strontium to calcium (Sr/Ca) variability. The use of a synchrotron for coral paleoclimate analysis is relatively new. The method provides a high resolution, two-dimensional elemental map of a coral surface. The aragonitic skeleton of Porites sp. colonies has been widely used for paleoclimate reconstruction as the oxygen isotope ratio (delta 18O) signal varies with both sea surface temperature (SST) and sea surface salinity (SSS). Sr/Ca has been used in previous studies in conjunction with delta 18O to deconvolve SST from SSS, as Sr/Ca in the coral skeleton varies with SST, but not SSS. However, recent studies suggest that in some cases Sr/Ca variability in coral does not reliably reflect changes in SST. We sought to address this puzzle by investigating Sr/Ca variability in Porites corals at a very fine spatial scale while also demonstrating the suitability of the synchrotron as a coral analysis tool. We also considered Sr/Ca variability as it pertains to the coral's structural elements. The Stanford Linear Accelerator Center synchrotron station generates collimated x-rays in the energy range of 4500-45000 eV with beam diameters as small as 20 mu m. Synchrotron imaging allows faster and higher-resolution Sr/Ca analysis than does inductively coupled plasma mass spectrometry (ICP-MS). It also is capable of mapping spatial distributions of many elements, which aids in the development of a multiproxy approach to paleoclimate reconstruction. Imaging and analysis of the Porites coral using synchrotron radiation revealed an intricate sub-seasonal Sr/Ca signal, possibly correlating to a sub-monthly resolution. This signal, which seems unrelated to SST, dominates the annual signal. JF - American Geophysical Union Fall Meeting AU - Cirino, M AU - Dunbar, R B AU - Tangri, N AU - Mehta, A AU - Anonymous Y1 - 2014/12// PY - 2014 DA - December 2014 SP - Abstract B41B EP - 0025 PB - American Geophysical Union, Washington, DC VL - 2014 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1718050461?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=High-resolution+synchrotron+radiation+imaging+of+trace+metal+elemental+concentrations+in+Porites+coral&rft.au=Cirino%2C+M%3BDunbar%2C+R+B%3BTangri%2C+N%3BMehta%2C+A%3BAnonymous&rft.aulast=Cirino&rft.aufirst=M&rft.date=2014-12-01&rft.volume=2014&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2014 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-10-01 N1 - CODEN - #07548 ER - TY - JOUR T1 - Elucidating the composition and distribution of trace metals in corals AN - 1718050440; 2015-092736 AB - Coral reefs host a plethora of marine life and thereby provide a wealth of aesthetic and economic benefits to coastal countries. Anthropogenic influences, including local coastal water contamination, however threaten the health of these delicate ecosystems. Metal incorporation into carbonate minerals, the backbone of coral reefs, is known to have a large yet variable impact on carbonate structure and solubility. Yet, trace metal influences on the structure, porosity, composition, and solubility of coral skeletons is largely unknown. Here, we coupled synchrotron-based micro-X-ray fluorescence (u-XRF) mapping and X-ray absorption near edge structure (XANES) spectroscopy with micro-X-ray diffraction (XRD) to explore the distribution and speciation of trace metals associated with corals and their impact on the carbonate structure of corals obtained from reefs varying in anthropogenic influence--Florida Keys, FL USA and the Federated States of Micronesia. Iron and copper were the most abundant metals in the biological tissue, while in some areas zinc was observed in the tissue, overlapping with the skeleton. Trace metals were not detectable in the aragonite skeletons; in fact, the distributions of Ca and Fe were anti-correlated. XANES spectra show that the iron is primarily Fe(III), likely as the poorly crystalline iron oxide ferrihydrite structure or trapped within ferretin proteins. The same trace metals were observed in corals of different species and from different environments. This in situ investigation corroborates previous studies that corals tend to incorporate iron into the biological components but not into the aragonite skeleton. Given the dominant partitioning of metals within the biological tissue rather than the coral skeleton, the specific carbon molecules responsible for metal attenuation and their fate under changing geochemical conditions and following coral death require exploration. JF - American Geophysical Union Fall Meeting AU - Farfan, G AU - Webb, Sam M AU - Apprill, A AU - Hansel, C M AU - Anonymous Y1 - 2014/12// PY - 2014 DA - December 2014 SP - Abstract B41B EP - 0026 PB - American Geophysical Union, Washington, DC VL - 2014 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1718050440?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Elucidating+the+composition+and+distribution+of+trace+metals+in+corals&rft.au=Farfan%2C+G%3BWebb%2C+Sam+M%3BApprill%2C+A%3BHansel%2C+C+M%3BAnonymous&rft.aulast=Farfan&rft.aufirst=G&rft.date=2014-12-01&rft.volume=2014&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2014 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-10-01 N1 - CODEN - #07548 ER - TY - JOUR T1 - Understanding the development and stabilization of Mn(III) intermediates during microbial manganese reduction AN - 1676592754; 2015-038009 AB - The dominant products of Mn(II) oxidation are manganese(IV)-oxide phases, which act as important environmental oxidants and sorbents in soils, freshwater, and marine sediments. Mn(IV) oxides also provide favorable electron acceptors for metal-reducing microbes, but the intermediates and final products formed are highly dependent on environmental conditions, and challenging to predict thermodynamically. We engineered a flow-through reactor system to study the Mn phases during microbial Mn(IV) reduction by Shewanella oneidensis MR-1 in real time, using synchrotron X-ray absorption spectroscopy (XAS) to monitor redox and mineralogical changes. These 10-20 hour experiments capture Mn XAS spectra every 20 minutes and thus we can observe both transient phases and stable products under different experimental conditions. We also record the pH, collect solution and filtered solid samples throughout the experiments for later solute measurements, and confirm mineral identifications with synchrotron x-ray diffraction measurements. With excess organic carbon and high (mM) phosphate (like in a soil), Mn(IV) oxides are reduced to Mn(II) and immediately form Mn(II) phosphate in a clearly binary system. This experiment demonstrates that while there may be two successive single-electron transfer reactions from outer membrane cytochromes (Lin et al, 2012), the microbial reduction of Mn(IV) oxides is effectively a two-electron process. However, with minimal phosphate, a transient Mn(III) oxyhydroxide forms before all manganese is reduced to Mn(II) in solution and precipitates a final Mn(II)-carbonate product. We propose this Mn(III) intermediate phase forms due to reaction of Mn2+ in solution with Mn(IV)-oxide surfaces to form Mn(III)OOH, similar to experimental results from this abiotic comproportionation reaction (Elzinga, 2011). Recently, we stabilized this Mn(III) intermediate by limiting the organic carbon available to S. oneidensis, producing Mn(III)OOH and Mn(II) phases-an enigmatic but common assemblage in Mn-rich sedimentary rocks deposited on Earth after the rise of oxygen. Understanding how the reductive arm of the manganese cycle functions under a variety of environmental conditions will allow us to better predict the fate of Mn phases in a range of both modern and ancient environments. JF - American Geophysical Union Fall Meeting AU - Johnson, J E AU - Savalia, P AU - Kocar, B D AU - Webb, Sam M AU - Nealson, K H AU - Fischer, W W AU - Anonymous Y1 - 2014/12// PY - 2014 DA - December 2014 SP - Abstract B43C EP - 0266 PB - American Geophysical Union, Washington, DC VL - 2014 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1676592754?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Understanding+the+development+and+stabilization+of+Mn%28III%29+intermediates+during+microbial+manganese+reduction&rft.au=Johnson%2C+J+E%3BSavalia%2C+P%3BKocar%2C+B+D%3BWebb%2C+Sam+M%3BNealson%2C+K+H%3BFischer%2C+W+W%3BAnonymous&rft.aulast=Johnson&rft.aufirst=J&rft.date=2014-12-01&rft.volume=2014&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2014 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Optical transmission enhancement through chemically tuned two-dimensional bismuth chalcogenide nanoplates. AN - 1628881128; 25430612 AB - Layer-structured two-dimensional nanomaterials are a family of materials with strong covalent bonding within layers and weak van der Waals interaction between layers, whose vertical thickness can be thinned down to few nanometer and even single atomic layer. Bismuth chalcogenides are examples of such two-dimensional materials. Here, we present our discovery of significant enhancement of light transmission through thin nanoplates of layered bismuth chalcogenides by intercalation of copper atoms, which is on the contrary to most bulk materials in which doping reduces the light transmission. This surprising behaviour results from two mechanisms: chemical tuning effect of substantial reduction of material absorption after intercalation and nanophotonic effect of zero-wave anti-reflection unique to ultra-small thickness of nanoplates. We demonstrate that the synergy of these two effects in two-dimensional nanostructures can be exploited for various optoelectronic applications including transparent electrode. The intercalation mechanism allows potential dynamic tuning capability. JF - Nature communications AU - Yao, Jie AU - Koski, Kristie J AU - Luo, Weidong AU - Cha, Judy J AU - Hu, Liangbing AU - Kong, Desheng AU - Narasimhan, Vijay Kris AU - Huo, Kaifu AU - Cui, Yi AD - Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA. ; 1] Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA [2] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA. Y1 - 2014/11/28/ PY - 2014 DA - 2014 Nov 28 SP - 5670 VL - 5 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1628881128?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+communications&rft.atitle=Optical+transmission+enhancement+through+chemically+tuned+two-dimensional+bismuth+chalcogenide+nanoplates.&rft.au=Yao%2C+Jie%3BKoski%2C+Kristie+J%3BLuo%2C+Weidong%3BCha%2C+Judy+J%3BHu%2C+Liangbing%3BKong%2C+Desheng%3BNarasimhan%2C+Vijay+Kris%3BHuo%2C+Kaifu%3BCui%2C+Yi&rft.aulast=Yao&rft.aufirst=Jie&rft.date=2014-11-28&rft.volume=5&rft.issue=&rft.spage=5670&rft.isbn=&rft.btitle=&rft.title=Nature+communications&rft.issn=2041-1723&rft_id=info:doi/10.1038%2Fncomms6670 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2015-04-02 N1 - Date created - 2014-11-28 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/ncomms6670 ER - TY - CPAPER T1 - Effects of d-Band Shape on the Surface Reactivity of Transition-Metal Alloys T2 - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AN - 1627967794; 6311860 JF - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AU - Xin, Hongliang AU - Vojvodic, Aleksandra AU - Voss, Johannes AU - Norskov, Jens AU - Abild-Pedersen, Frank Y1 - 2014/11/16/ PY - 2014 DA - 2014 Nov 16 KW - Alloys KW - alloys UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1627967794?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.atitle=Effects+of+d-Band+Shape+on+the+Surface+Reactivity+of+Transition-Metal+Alloys&rft.au=Xin%2C+Hongliang%3BVojvodic%2C+Aleksandra%3BVoss%2C+Johannes%3BNorskov%2C+Jens%3BAbild-Pedersen%2C+Frank&rft.aulast=Xin&rft.aufirst=Hongliang&rft.date=2014-11-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2014/webprogram/meeting2014-11-16.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-31 N1 - Last updated - 2014-11-26 ER - TY - CPAPER T1 - Nucleation and Growth of Organic Semiconductor Polymorphs T2 - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AN - 1627965326; 6311551 JF - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AU - Diao, Ying AU - Lenn, Kristina AU - Clancy, Paulette AU - Bao, Zhenan AU - Mannsfeld, Stefan Y1 - 2014/11/16/ PY - 2014 DA - 2014 Nov 16 KW - Nucleation KW - Growth UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1627965326?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.atitle=Nucleation+and+Growth+of+Organic+Semiconductor+Polymorphs&rft.au=Diao%2C+Ying%3BLenn%2C+Kristina%3BClancy%2C+Paulette%3BBao%2C+Zhenan%3BMannsfeld%2C+Stefan&rft.aulast=Diao&rft.aufirst=Ying&rft.date=2014-11-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2014/webprogram/meeting2014-11-16.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-31 N1 - Last updated - 2014-11-26 ER - TY - CPAPER T1 - Role of Adsorbate-Adsorbate Interactions in Dynamics of Surface Bond Breaking T2 - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AN - 1627964088; 6309913 JF - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AU - Xin, Hongliang Y1 - 2014/11/16/ PY - 2014 DA - 2014 Nov 16 KW - Chemical engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1627964088?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.atitle=Role+of+Adsorbate-Adsorbate+Interactions+in+Dynamics+of+Surface+Bond+Breaking&rft.au=Xin%2C+Hongliang&rft.aulast=Xin&rft.aufirst=Hongliang&rft.date=2014-11-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2014/webprogram/meeting2014-11-16.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-31 N1 - Last updated - 2014-11-26 ER - TY - CPAPER T1 - Catmap: A Software Package for Descriptor-Based Micro-Kinetic Mapping of Catalytic Trends T2 - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AN - 1627962213; 6309698 JF - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AU - Medford, Andrew AU - Lausche, Adam AU - Fitzgibbon, Sean AU - Bligaard, Thomas AU - Norskov, Jens Y1 - 2014/11/16/ PY - 2014 DA - 2014 Nov 16 KW - Computer programs KW - Mapping UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1627962213?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.atitle=Catmap%3A+A+Software+Package+for+Descriptor-Based+Micro-Kinetic+Mapping+of+Catalytic+Trends&rft.au=Medford%2C+Andrew%3BLausche%2C+Adam%3BFitzgibbon%2C+Sean%3BBligaard%2C+Thomas%3BNorskov%2C+Jens&rft.aulast=Medford&rft.aufirst=Andrew&rft.date=2014-11-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2014/webprogram/meeting2014-11-16.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-31 N1 - Last updated - 2014-11-26 ER - TY - CPAPER T1 - Computational Database of Metal-Oxide Surface Reactivities for Catalyst Design T2 - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AN - 1627960551; 6308557 JF - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AU - Bajdich, Michal AU - Vojvodic, Aleksandra AU - Norskov, Jens Y1 - 2014/11/16/ PY - 2014 DA - 2014 Nov 16 KW - Databases KW - Catalysts KW - Computer applications UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1627960551?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.atitle=Computational+Database+of+Metal-Oxide+Surface+Reactivities+for+Catalyst+Design&rft.au=Bajdich%2C+Michal%3BVojvodic%2C+Aleksandra%3BNorskov%2C+Jens&rft.aulast=Bajdich&rft.aufirst=Michal&rft.date=2014-11-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2014/webprogram/meeting2014-11-16.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-31 N1 - Last updated - 2014-11-26 ER - TY - CPAPER T1 - Assessing the Reliability of Calculated Catalytic Ammonia Synthesis Rates with Beef-Vdw T2 - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AN - 1627959619; 6307796 JF - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AU - Medford, Andrew AU - Wellendorff, Jess AU - Vojvodic, Aleksandra AU - Studt, Felix AU - Abild-Pedersen, Frank AU - Bligaard, Thomas AU - Norskov, Jens Y1 - 2014/11/16/ PY - 2014 DA - 2014 Nov 16 KW - Ammonia UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1627959619?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.atitle=Assessing+the+Reliability+of+Calculated+Catalytic+Ammonia+Synthesis+Rates+with+Beef-Vdw&rft.au=Medford%2C+Andrew%3BWellendorff%2C+Jess%3BVojvodic%2C+Aleksandra%3BStudt%2C+Felix%3BAbild-Pedersen%2C+Frank%3BBligaard%2C+Thomas%3BNorskov%2C+Jens&rft.aulast=Medford&rft.aufirst=Andrew&rft.date=2014-11-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2014/webprogram/meeting2014-11-16.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-31 N1 - Last updated - 2014-11-26 ER - TY - CPAPER T1 - In-Situ Synchrotron X-Ray Spectroscopic Techniques for the Study on Catalyst for Oxygen Evolution Reaction T2 - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AN - 1627958226; 6307667 JF - 2014 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2014) AU - Li, Lin Y1 - 2014/11/16/ PY - 2014 DA - 2014 Nov 16 KW - Oxygen KW - X-rays KW - Ionizing radiation KW - Catalysts KW - Spectroscopy KW - Evolution UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1627958226?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.atitle=In-Situ+Synchrotron+X-Ray+Spectroscopic+Techniques+for+the+Study+on+Catalyst+for+Oxygen+Evolution+Reaction&rft.au=Li%2C+Lin&rft.aulast=Li&rft.aufirst=Lin&rft.date=2014-11-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2014+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2014%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2014/webprogram/meeting2014-11-16.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-31 N1 - Last updated - 2014-11-26 ER - TY - JOUR T1 - Competing retention pathways of uranium upon reaction with Fe(II) AN - 1618132698; 2014-086865 AB - Biogeochemical retention processes, including adsorption, reductive precipitation, and incorporation into host minerals, are important in contaminant transport, remediation, and geologic deposition of uranium. Recent work has shown that U can become incorporated into iron (hydr)oxide minerals, with a key pathway arising from Fe(II)-induced transformation of ferrihydrite, (Fe(OH) (sub 3) .nH (sub 2) O) to goethite (alpha -FeO(OH)); this is a possible U retention mechanism in soils and sediments. Several key questions, however, remain unanswered regarding U incorporation into iron (hydr)oxides and this pathway's contribution to U retention, including: (i) the competitiveness of U incorporation versus reduction to U(IV) and subsequent precipitation of UO (sub 2) ; (ii) the oxidation state of incorporated U; (iii) the effects of uranyl aqueous speciation on U incorporation; and, (iv) the mechanism of U incorporation. Here we use a series of batch reactions conducted at pH approximately 7, [U(VI)] from 1 to 170 mu M, [Fe(II)] from 0 to 3 mM, and [Ca] at 0 or 4 mM coupled with spectroscopic examination of reaction products of Fe(II)-induced ferrihydrite transformation to address these outstanding questions. Uranium retention pathways were identified and quantified using extended X-ray absorption fine structure (EXAFS) spectroscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Analysis of EXAFS spectra showed that 14-89% of total U was incorporated into goethite, upon reaction with Fe(II) and ferrihydrite. Uranium incorporation was a particularly dominant retention pathway at U concentrations < or =50 mu M when either uranyl-carbonato or calcium-uranyl-carbonato complexes were dominant, accounting for 64-89% of total U. With increasing U(VI) and Fe(II) concentrations, U(VI) reduction to U(IV) became more prevalent, but U incorporation remained a functioning retention pathway. These findings highlight the potential importance of U(V) incorporation within iron oxides as a retention process of U across a wide range of biogeochemical environments and the sensitivity of uranium retention processes to operative (bio)geochemical conditions. Abstract Copyright (2014) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Massey, Michael S AU - Lezama Pacheco, Juan S AU - Jones, Morris E AU - Ilton, Eugene S AU - Cerrato, Jose M AU - Bargar, John R AU - Fendorf, Scott Y1 - 2014/10/01/ PY - 2014 DA - 2014 Oct 01 SP - 166 EP - 185 PB - Elsevier, New York, NY VL - 142 SN - 0016-7037, 0016-7037 KW - United States KW - solute transport KW - goethite KW - X-ray diffraction data KW - mass spectra KW - power plants KW - environmental analysis KW - iron KW - remediation KW - synchrotron radiation KW - chemical reactions KW - transport KW - retention KW - oxides KW - spectra KW - X-ray photoelectron spectra KW - water pollution KW - Washington KW - acid mine drainage KW - pollutants KW - pollution KW - Hanford Site KW - ferrihydrite KW - TEM data KW - ICP mass spectra KW - uranium ores KW - organic compounds KW - biogenic processes KW - soil pollution KW - metals KW - metal ores KW - EXAFS data KW - uranium KW - mobilization KW - military facilities KW - actinides KW - 22:Environmental geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618132698?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Competing+retention+pathways+of+uranium+upon+reaction+with+Fe%28II%29&rft.au=Massey%2C+Michael+S%3BLezama+Pacheco%2C+Juan+S%3BJones%2C+Morris+E%3BIlton%2C+Eugene+S%3BCerrato%2C+Jose+M%3BBargar%2C+John+R%3BFendorf%2C+Scott&rft.aulast=Massey&rft.aufirst=Michael&rft.date=2014-10-01&rft.volume=142&rft.issue=&rft.spage=166&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2014.07.016 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2014-01-01 N1 - Number of references - 97 N1 - PubXState - NY N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Includes appendices N1 - Last updated - 2014-10-30 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - acid mine drainage; actinides; biogenic processes; chemical reactions; environmental analysis; EXAFS data; ferrihydrite; goethite; Hanford Site; ICP mass spectra; iron; mass spectra; metal ores; metals; military facilities; mobilization; organic compounds; oxides; pollutants; pollution; power plants; remediation; retention; soil pollution; solute transport; spectra; synchrotron radiation; TEM data; transport; United States; uranium; uranium ores; Washington; water pollution; X-ray diffraction data; X-ray photoelectron spectra DO - http://dx.doi.org/10.1016/j.gca.2014.07.016 ER - TY - JOUR T1 - Metal oxyhydroxide dissolution as promoted by structurally diverse siderophores and oxalate AN - 1623259845; 2014-089252 AB - Siderophores, a class of biogenic ligands with high affinities for Fe(III), promote the dissolution of metal ions from sparingly soluble mineral phases. However, most geochemical studies have focused on quantifying the reactivity of DFOB, a model trishydroxamate siderophore. This study utilized three different siderophores, desferrioxamine B, rhizoferrin, and protochelin, with structures that contain the most commonly observed binding moieties of microbial siderophores to examine the siderophore-promoted dissolution rates of FeOOH, CoOOH, and MnOOH in the absence and presence of the ubiquitous low molecular mass organic acid oxalate by utilizing batch dissolution experiments at pH = 5-9. Metal-siderophore complex and total dissolved metal concentrations were monitored for durations of one hour to fourteen days, depending on the metal oxyhydroxide identity and solution pH. The results demonstrate that MnOOH and CoOOH generally dissolve more quickly in the presence of siderophores than FeOOH. Whereas FeOOH dissolved exclusively by a ligand-promoted dissolution mechanism, MnOOH and CoOOH dissolved predominantly by a reductive dissolution mechanism under most experimental conditions. For FeOOH, siderophore-promoted dissolution rates trended with the stability constant of the corresponding aqueous Fe(III) complex. In the presence of oxalate, measured siderophore-promoted dissolution rates were found to increase, decrease, or remain unchanged as compared to the observed rates in single-ligand systems, depending on the pH of the system, the siderophore present, and the identity of the metal oxyhydroxide. Increases in observed dissolution rates in the presence of oxalate were generally greater for FeOOH than for MnOOH or CoOOH. These results elucidate potential dissolution mechanisms of both ferric and non-ferric oxyhydroxide minerals by siderophores in the environment, and may provide further insights into the biological strategies of metal acquisition facilitated by coordinated exudation of low molecular weight organic acids and siderophores. Abstract Copyright (2014) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Akafia, Martin M AU - Harrington, James M AU - Bargar, John R AU - Duckworth, Owen W Y1 - 2014/09/15/ PY - 2014 DA - 2014 Sep 15 SP - 258 EP - 269 PB - Elsevier, New York, NY VL - 141 SN - 0016-7037, 0016-7037 KW - experimental studies KW - X-ray diffraction data KW - biochemistry KW - oxyhydroxides KW - oxalates KW - solubility KW - TEM data KW - siderophores KW - molecular structure KW - models KW - hydroxides KW - organic compounds KW - ligands KW - biogenic processes KW - chemical reactions KW - metals KW - oxides KW - crystal chemistry KW - pH KW - microorganisms KW - 01C:Mineralogy of non-silicates KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623259845?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Metal+oxyhydroxide+dissolution+as+promoted+by+structurally+diverse+siderophores+and+oxalate&rft.au=Akafia%2C+Martin+M%3BHarrington%2C+James+M%3BBargar%2C+John+R%3BDuckworth%2C+Owen+W&rft.aulast=Akafia&rft.aufirst=Martin&rft.date=2014-09-15&rft.volume=141&rft.issue=&rft.spage=258&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2014.06.024 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2014-01-01 N1 - Number of references - 72 N1 - PubXState - NY N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2014-11-13 N1 - SubjectsTermNotLitGenreText - biochemistry; biogenic processes; chemical reactions; crystal chemistry; experimental studies; hydroxides; ligands; metals; microorganisms; models; molecular structure; organic compounds; oxalates; oxides; oxyhydroxides; pH; siderophores; solubility; TEM data; X-ray diffraction data DO - http://dx.doi.org/10.1016/j.gca.2014.06.024 ER - TY - JOUR T1 - Insitunanotomography and operandotransmission X-ray microscopy of micron-sized Ge particles AN - 1554942402; 20479436 AB - To design an inexpensive, non-toxic, practical replacement to the internal combustion engine, significant advances in battery technology are required. Germanium anodes offer more than four times larger capacity than presently used graphite anodes. Yet large volume changes during operation severely limit their lifetime. To understand the origin, dynamics, and failure mechanisms of these and other electrode materials, it is essential to image batteries under operating conditions. Using transmission X-ray microscopy the morphology and electron density changes in Ge anode particles are tracked during operation. We observe significant size dependence on the cycling characteristics of Ge particles. Only Ge particles with diameters larger than a few microns display cracks during cycling. Small Ge particles experience volume expansion and cracking before their larger counterparts, but rapidly lose electrical contact. With in situnanotomography, we demonstrate unambiguously for the first time the fracturing of alloying anode materials into completely unconnected pieces. Moreover, we show that the density changes due to lithiation are consistent with partial transformation into a Li sub(15)Ge sub(4)-like phase. Our results demonstrate the significant value in linking electrochemical performance studies with morphological evolution to understand failure mechanisms and encourage more systematic searches for a viable high capacity anode material. JF - Energy & Environmental Science AU - Weker, JNelson AU - Liu, N AU - Misra, S AU - Andrews, J C AU - Cui, Y AU - Toney, M F AD - Stanford Synchrotron Radiation Lightsource; SLAC National Accelerator Laboratory; Menlo Park; CA; USA; , jlnelson@slac.stanford.edu Y1 - 2014/07// PY - 2014 DA - Jul 2014 SP - 2771 EP - 2777 PB - Royal Society of Chemistry, c/o Springer-Verlag New York Inc. Secaucus New Jersey 07096 2485 United States VL - 7 IS - 8 SN - 1754-5692, 1754-5692 KW - Environment Abstracts KW - Batteries KW - Energy KW - Microscopy KW - Electrodes KW - Morphology KW - Germanium KW - Particulates KW - Electrochemistry KW - Internal combustion engines KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1554942402?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Energy+%26+Environmental+Science&rft.atitle=Insitunanotomography+and+operandotransmission+X-ray+microscopy+of+micron-sized+Ge+particles&rft.au=Weker%2C+JNelson%3BLiu%2C+N%3BMisra%2C+S%3BAndrews%2C+J+C%3BCui%2C+Y%3BToney%2C+M+F&rft.aulast=Weker&rft.aufirst=JNelson&rft.date=2014-07-01&rft.volume=7&rft.issue=8&rft.spage=2771&rft.isbn=&rft.btitle=&rft.title=Energy+%26+Environmental+Science&rft.issn=17545692&rft_id=info:doi/10.1039%2Fc4ee01384k LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-08-01 N1 - Number of references - 35 N1 - Last updated - 2015-08-05 N1 - SubjectsTermNotLitGenreText - Batteries; Energy; Morphology; Electrodes; Microscopy; Germanium; Particulates; Internal combustion engines; Electrochemistry; Technology DO - http://dx.doi.org/10.1039/c4ee01384k ER - TY - JOUR T1 - Ultra-high aspect ratio high-resolution nanofabrication for hard X-ray diffractive optics. AN - 1541374728; 24970569 AB - Although diffractive optics have played a major role in nanoscale soft X-ray imaging, high-resolution and high-efficiency diffractive optics have largely been unavailable for hard X-rays where many scientific, technological and biomedical applications exist. This is owing to the long-standing challenge of fabricating ultra-high aspect ratio high-resolution dense nanostructures. Here we report significant progress in ultra-high aspect ratio nanofabrication of high-resolution, dense silicon nanostructures using vertical directionality controlled metal-assisted chemical etching. The resulting structures have very smooth sidewalls and can be used to pattern arbitrary features, not limited to linear or circular. We focus on the application of X-ray zone plate fabrication for high-efficiency, high-resolution diffractive optics, and demonstrate the process with linear, circular, and spiral zone plates. X-ray measurements demonstrate high efficiency in the critical outer layers. This method has broad applications including patterning for thermoelectric materials, battery anodes and sensors among others. JF - Nature communications AU - Chang, Chieh AU - Sakdinawat, Anne AD - SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, 2575 Sand Hill Road MS69, Menlo Park, California 94025, USA. Y1 - 2014/06/27/ PY - 2014 DA - 2014 Jun 27 SP - 4243 VL - 5 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1541374728?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+communications&rft.atitle=Ultra-high+aspect+ratio+high-resolution+nanofabrication+for+hard+X-ray+diffractive+optics.&rft.au=Chang%2C+Chieh%3BSakdinawat%2C+Anne&rft.aulast=Chang&rft.aufirst=Chieh&rft.date=2014-06-27&rft.volume=5&rft.issue=&rft.spage=4243&rft.isbn=&rft.btitle=&rft.title=Nature+communications&rft.issn=2041-1723&rft_id=info:doi/10.1038%2Fncomms5243 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2015-04-19 N1 - Date created - 2014-06-27 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/ncomms5243 ER - TY - JOUR T1 - Light management for photovoltaics using high-index nanostructures. AN - 1518622538; 24751773 AB - High-performance photovoltaic cells use semiconductors to convert sunlight into clean electrical power, and transparent dielectrics or conductive oxides as antireflection coatings. A common feature of these materials is their high refractive index. Whereas high-index materials in a planar form tend to produce a strong, undesired reflection of sunlight, high-index nanostructures afford new ways to manipulate light at a subwavelength scale. For example, nanoscale wires, particles and voids support strong optical resonances that can enhance and effectively control light absorption and scattering processes. As such, they provide ideal building blocks for novel, broadband antireflection coatings, light-trapping layers and super-absorbing films. This Review discusses some of the recent developments in the design and implementation of such photonic elements in thin-film photovoltaic cells. JF - Nature materials AU - Brongersma, Mark L AU - Cui, Yi AU - Fan, Shanhui AD - Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA. ; 1] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA [2] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA. ; Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA. Y1 - 2014/05// PY - 2014 DA - May 2014 SP - 451 EP - 460 VL - 13 IS - 5 SN - 1476-1122, 1476-1122 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1518622538?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+materials&rft.atitle=Light+management+for+photovoltaics+using+high-index+nanostructures.&rft.au=Brongersma%2C+Mark+L%3BCui%2C+Yi%3BFan%2C+Shanhui&rft.aulast=Brongersma&rft.aufirst=Mark&rft.date=2014-05-01&rft.volume=13&rft.issue=5&rft.spage=451&rft.isbn=&rft.btitle=&rft.title=Nature+materials&rft.issn=14761122&rft_id=info:doi/10.1038%2Fnmat3921 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2014-06-04 N1 - Date created - 2014-04-22 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1038/nmat3921 ER - TY - JOUR T1 - Different reactivity of the various platinum oxides and chemisorbed oxygen in CO oxidation on Pt(111). AN - 1520353029; 24708067 AB - We have used X-ray photoelectron spectroscopy and polarization-resolved O K-edge X-ray absorption spectroscopy to investigate the reactivity of various oxygen covered Pt(111) surfaces, which emerge under high temperature and pressure conditions, toward CO. We find that the reactivity of the O/Pt(111) system decreases monotonically with increasing oxygen coverage. Of the three surface oxygen phases, viz., chemisorbed oxygen (O(ad)), a PtO-like surface oxide, and α-PtO2 trilayers, Oad exhibits the highest reactivity toward CO, whereas α-PtO2 trilayers exhibit the lowest. Pt(111) surfaces fully terminated by α-PtO2 trilayers are inert to CO. Here it is proposed that the reactive phase is either O(ad) or PtO-like surface oxide phase on bare non-CO poisoned Pt regions with PtO2 as majority spectator species. JF - Journal of the American Chemical Society AU - Miller, Daniel AU - Sanchez Casalongue, Hernan AU - Bluhm, Hendrik AU - Ogasawara, Hirohito AU - Nilsson, Anders AU - Kaya, Sarp AD - SUNCAT Center for Interface Science and Catalysis and §Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory , 2575 Sand Hill Rd, Menlo Park, California 94025, United States. Y1 - 2014/04/30/ PY - 2014 DA - 2014 Apr 30 SP - 6340 EP - 6347 VL - 136 IS - 17 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1520353029?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+the+American+Chemical+Society&rft.atitle=Different+reactivity+of+the+various+platinum+oxides+and+chemisorbed+oxygen+in+CO+oxidation+on+Pt%28111%29.&rft.au=Miller%2C+Daniel%3BSanchez+Casalongue%2C+Hernan%3BBluhm%2C+Hendrik%3BOgasawara%2C+Hirohito%3BNilsson%2C+Anders%3BKaya%2C+Sarp&rft.aulast=Miller&rft.aufirst=Daniel&rft.date=2014-04-30&rft.volume=136&rft.issue=17&rft.spage=6340&rft.isbn=&rft.btitle=&rft.title=Journal+of+the+American+Chemical+Society&rft.issn=1520-5126&rft_id=info:doi/10.1021%2Fja413125q LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2015-09-30 N1 - Date created - 2014-04-30 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-23 DO - http://dx.doi.org/10.1021/ja413125q ER - TY - JOUR T1 - redMaPPer. I. ALGORITHM AND SDSS DR8 CATALOG AN - 1705071556; PQ0001812211 AB - We describe redMaPPer, a new red sequence cluster finder specifically designed to make optimal use of ongoing and near-future large photometric surveys. The algorithm has multiple attractive features: (1) it can iteratively self-train the red sequence model based on a minimal spectroscopic training sample, an important feature for high-redshift surveys. (2) It can handle complex masks with varying depth. (3) It produces cluster-appropriate random points to enable large-scale structure studies. (4) All clusters are assigned a full redshift probability distribution P(z). (5) Similarly, clusters can have multiple candidate central galaxies, each with corresponding centering probabilities. (6) The algorithm is parallel and numerically efficient: it can run a Dark Energy Survey-like catalog in ~500 CPU hours. (7) The algorithm exhibits excellent photometric redshift performance, the richness estimates are tightly correlated with external mass proxies, and the completeness and purity of the corresponding catalogs are superb. We apply the redMaPPer algorithm to ~10,000 deg super(2) of SDSS DR8 data and present the resulting catalog of ~25,000 clusters over the redshift range z [isin] [0.08, 0.55]. The redMaPPer photometric redshifts are nearly Gaussian, with a scatter [sigma] sub(z) approximately 0.006 at z approximately 0.1, increasing to [sigma] sub(z) approximately 0.02 at z approximately 0.5 due to increased photometric noise near the survey limit. The median value for | Delta z|/(1 + z) for the full sample is 0.006. The incidence of projection effects is low ([< or =, slant]5%). Detailed performance comparisons of the redMaPPer DR8 cluster catalog to X-ray and Sunyaev-Zel'dovich catalogs are presented in a companion paper. JF - Astrophysical Journal AU - RYKOFF, E S AU - Rozo, E AU - BUSHA, M T AU - Cunha, C E AU - FINOGUENOV, A AU - Evrard, A AU - Hao, J AU - Koester, B P AU - LEAUTHAUD, A AU - Nord, B AU - Pierre, M AU - Reddick, R AU - Sadibekova, T AU - Sheldon, E S AU - Wechsler, R H AD - SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA Y1 - 2014/04/20/ PY - 2014 DA - 2014 Apr 20 SP - 1 EP - 33 PB - IOP Publishing, The Public Ledger Building, Suite 929 Philadelphia PA 19106 United States VL - 785 IS - 2 SN - 0004-637X, 0004-637X KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - galaxies: clusters: general KW - Training KW - Galactic clusters KW - Energy KW - Acoustic waves KW - Photometric observations KW - Galactic models KW - Algorithms KW - Galaxies KW - Noise pollution KW - P 7000:NOISE KW - M2 524:Stars, Universe (524) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1705071556?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrophysical+Journal&rft.atitle=redMaPPer.+I.+ALGORITHM+AND+SDSS+DR8+CATALOG&rft.au=RYKOFF%2C+E+S%3BRozo%2C+E%3BBUSHA%2C+M+T%3BCunha%2C+C+E%3BFINOGUENOV%2C+A%3BEvrard%2C+A%3BHao%2C+J%3BKoester%2C+B+P%3BLEAUTHAUD%2C+A%3BNord%2C+B%3BPierre%2C+M%3BReddick%2C+R%3BSadibekova%2C+T%3BSheldon%2C+E+S%3BWechsler%2C+R+H&rft.aulast=RYKOFF&rft.aufirst=E&rft.date=2014-04-20&rft.volume=785&rft.issue=2&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F785%2F2%2F104 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-08-01 N1 - Last updated - 2015-11-16 N1 - SubjectsTermNotLitGenreText - Galactic clusters; Photometric observations; Acoustic waves; Galactic models; Galaxies; Algorithms; Noise pollution; Training; Energy DO - http://dx.doi.org/10.1088/0004-637X/785/2/104 ER - TY - JOUR T1 - Discovery of a Ni-Ga catalyst for carbon dioxide reduction to methanol AN - 1554950128; 20508130 AB - The use of methanol as a fuel and chemical feedstock could become very important in the development of a more sustainable society if methanol could be efficiently obtained from the direct reduction of CO sub(2) using solar-generated hydrogen. If hydrogen production is to be decentralized, small-scale CO sub(2) reduction devices are required that operate at low pressures. Here, we report the discovery of a Ni-Ga catalyst that reduces CO sub(2) to methanol at ambient pressure. The catalyst was identified through a descriptor-based analysis of the process and the use of computational methods to identify Ni-Ga intermetallic compounds as stable candidates with good activity. We synthesized and tested a series of catalysts and found that Ni sub(5)Ga sub(3) is particularly active and selective. Comparison with conventional Cu/ZnO/Al sub(2)O sub(3) catalysts revealed the same or better methanol synthesis activity, as well as considerably lower production of CO. We suggest that this is a first step towards the development of small-scale low-pressure devices for CO sub(2) reduction to methanol. JF - Nature Chemistry AU - Studt, Felix AU - Sharafutdinov, Irek AU - Abild-Pedersen, Frank AU - Elkjaer, Christian F AU - Hummelshoej, Jens S AU - Dahl, Soeren AU - Chorkendorff, Ib AU - Noerskov, Jens K AD - SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Y1 - 2014/04// PY - 2014 DA - Apr 2014 SP - 320 EP - 324 PB - Nature Publishing Group, The Macmillan Building London N1 9XW United Kingdom VL - 6 IS - 4 SN - 1755-4330, 1755-4330 KW - Sustainability Science Abstracts; Environment Abstracts KW - Fuels KW - Methanol KW - Zinc KW - Sustainable development KW - Catalysts KW - Hydrogen KW - Carbon dioxide KW - M3 1010:Issues in Sustainable Development KW - ENA 01:Air Pollution UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1554950128?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Multicultural+Nursing+%26+Health&rft.atitle=Retention+strategies+for+ESL+nursing+students%3A+Review+of+literature+1900-99+and+strategies+and+outcomes+in+a+small+private+School+of+Nursing+with+limited+funding&rft.au=Klisch%2C+Mary+Lou&rft.aulast=Klisch&rft.aufirst=Mary&rft.date=2000-07-01&rft.volume=6&rft.issue=2&rft.spage=18&rft.isbn=&rft.btitle=&rft.title=Journal+of+Multicultural+Nursing+%26+Health&rft.issn=15268233&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-08-01 N1 - Last updated - 2014-10-30 N1 - SubjectsTermNotLitGenreText - Fuels; Zinc; Methanol; Sustainable development; Hydrogen; Catalysts; Carbon dioxide DO - http://dx.doi.org/10.1038/nchem.1873 ER - TY - CPAPER T1 - X-Ray Free-Electron Lasers Open New Realm of Crystallography T2 - 2014 Annual Meeting of the American Association for the Advancement of Science (AAAS 2014) AN - 1510099401; 6280118 JF - 2014 Annual Meeting of the American Association for the Advancement of Science (AAAS 2014) AU - Boutet, Sebastien Y1 - 2014/02/13/ PY - 2014 DA - 2014 Feb 13 KW - Lasers UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1510099401?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2014+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2014%29&rft.atitle=X-Ray+Free-Electron+Lasers+Open+New+Realm+of+Crystallography&rft.au=Boutet%2C+Sebastien&rft.aulast=Boutet&rft.aufirst=Sebastien&rft.date=2014-02-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2014+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2014%29&rft.issn=&rft_id=info:doi/ L2 - https://aaas.confex.com/aaas/2014/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-03-24 N1 - Last updated - 2014-03-26 ER - TY - JOUR T1 - Millimeter-sized bioturbating animals control the mobility of redox-sensitive trace elements in organic-rich mudstone AN - 1707524072; 2015-083106 AB - Bulk-rock geochemical interpretation of organic-rich mudstones (e.g., black shales) is fundamental to geological models of hydrocarbon systems and ancient oceanic anoxic events. High-sensitivity two-dimensional elemental maps acquired via Synchrotron Rapid Scanning X-ray Fluorescence (SRS-XRF) identify for the first time that the partitioning of redox-sensitive trace elements in fine-grained siliciclastic rocks is systematically controlled by millimeter-sized vermiform organisms. Detailed petrographic analysis of silt- and claystones from the Late Cretaceous Rosario Formation (Mexico) reveal that producers of phycosiphoniform burrows selectively sort silt- and clay-sized components smaller than 40 mu m, producing a spatially well-connected, high-porosity (20-30%) burrow halo. The burrow core is composed of a dense organo-clay matrix critically enriched in TOC (>1.5%) and some redox-sensitive elements (i.e., Fe, V, Cr, Mn, Co, Ni, Cu and As). Systematic differences in organic carbon quality between bioturbated and unbioturbated sediment (Delta (super 13) C (sub org) nearly equal 0.6 per mil) provide evidence that fecal matter has been modified by burrowing organisms. The relative enrichment of redox-sensitive elements within the burrow core does not correlate with significant neo-formation of early diagenetic pyrite (via trace metal pyritization), but is best explained by physical concentration of clay- and silt-sized components. A measured loss ( nearly equal -15%) of the high ionic radius elements Sr and Ba from both burrow halo and core cannot be explained by physical re-distribution of silt- and clay-sized rock components during foraging and feeding. Instead, this imbalance is most likely associated with the release of Sr and Ba to pore waters during biological (in-vivo) weathering of silt to clay-sized lithic components and also feldspar. Combined SEM, XRD and FTIR analyses reveal significant amounts of neo-formed smectitic clay and poorly-crystalline, non-identifiable clay-sized material in the burrow core. Phycosiphoniforms represent one of the most common Mesozoic and Cenozoic black shale trace fossils, which in certain cases can dominate an entire rock fabric. The intimate relationship between sediment ingestion and incipient, penecontemporaneous dissolution of the original mineralogy can change the bulk geochemistry of fine-grained sedimentary rocks prior to burial and should be considered in paleoenvironmental reconstructions and in the evaluation of potential organic-rich mudstones. JF - Abstracts: Annual Meeting - American Association of Petroleum Geologists AU - Harazim, Dario AU - McIlroy, Duncan AU - Edwards, Nicholas AU - Wogelius, Roy AU - Manning, Phillip AU - Poduska, Kristin AU - Bergmann, Uwe AU - Anonymous Y1 - 2014 PY - 2014 DA - 2014 PB - American Association of Petroleum Geologists and Society for Sedimentary Geology, Tulsa, OK VL - 2014 KW - Cretaceous KW - oceanic anoxic events KW - ichnofossils KW - siliciclastics KW - petroleum KW - Upper Cretaceous KW - Rosario Formation KW - sedimentary rocks KW - total organic carbon KW - trace elements KW - sedimentary structures KW - geochemistry KW - Eh KW - mudstone KW - biogenic structures KW - porosity KW - Mesozoic KW - biota KW - models KW - organic compounds KW - biogenic processes KW - paleoenvironment KW - Mexico KW - burrows KW - clastic rocks KW - bioturbation KW - 29A:Economic geology, geology of energy sources KW - 06A:Sedimentary petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707524072?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts%3A+Annual+Meeting+-+American+Association+of+Petroleum+Geologists&rft.atitle=Millimeter-sized+bioturbating+animals+control+the+mobility+of+redox-sensitive+trace+elements+in+organic-rich+mudstone&rft.au=Harazim%2C+Dario%3BMcIlroy%2C+Duncan%3BEdwards%2C+Nicholas%3BWogelius%2C+Roy%3BManning%2C+Phillip%3BPoduska%2C+Kristin%3BBergmann%2C+Uwe%3BAnonymous&rft.aulast=Harazim&rft.aufirst=Dario&rft.date=2014-01-01&rft.volume=2014&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts%3A+Annual+Meeting+-+American+Association+of+Petroleum+Geologists&rft.issn=&rft_id=info:doi/ L2 - http://www.searchanddiscovery.com/abstracts/html/2014/90189ace/abstracts/1841809.html LA - English DB - GeoRef N1 - Conference title - AAPG 2014 annual convention & exhibition N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States N1 - Date revised - 2015-01-01 N1 - PubXState - OK N1 - Last updated - 2015-08-27 N1 - CODEN - #06983 N1 - SubjectsTermNotLitGenreText - biogenic processes; biogenic structures; biota; bioturbation; burrows; clastic rocks; Cretaceous; Eh; geochemistry; ichnofossils; Mesozoic; Mexico; models; mudstone; oceanic anoxic events; organic compounds; paleoenvironment; petroleum; porosity; Rosario Formation; sedimentary rocks; sedimentary structures; siliciclastics; total organic carbon; trace elements; Upper Cretaceous ER - TY - JOUR T1 - Enhanced retention of aqueous transition metals in mesoporous silica AN - 1696873508; 2015-066300 AB - Mesoporosity (2-50 nm diameter pores) is abundant within grain coatings and primary silicate minerals in natural environments. Mesopores often contribute significantly to total specific surface area and act as gateways for the transport of subsurface solutes, including nutrients and contaminants, between mineral surfaces and ambient fluids. However, the physiochemical mechanisms of sorption and transport within mesopores cannot be assumed to be the same as for macropores (>50 nm), because of confinement-induced changes in water properties, the structure of electrical double layers, solvation shells and dehydration rates of aquo ions, and the charge and reactive site densities of mineral surfaces. Despite the ubiquity of confined spaces in natural and industrial porous media, few studies have examined the molecular-scale mechanisms and geochemical reactions controlling meso-confinement phenomena in environmentally relevant materials. We conducted batch Zn sorption experiments using synthetic, controlled pore-size (i.e., 7.5-300 nm), metal-oxide beads as model geologic substrates. Comparison of Zn adsorbed onto macroporous and mesoporous silica beads indicates Zn adsorption capacity is increased in mesopores when normalized to surface area. In the presence of a background electrolyte (i.e., NaCl), Zn sorption capacity to macroporous silica is reduced; however, no significant difference in Zn sorption capacity on mesoporous silica was observed between the presence and absence of a background electrolyte. The effect of competing cations is indirect evidence that mesopores promote inner-sphere complexation and reduce outer-sphere complexation. EXAFS characterization of adsorbed zinc to macroporous silica matches that reported for low Zn coverages on silica (Roberts et al., JCIS, 2003), whereas a different spectrum is observed for the mesoporous case. Shell-by-shell fitting indicates that Zn is dominantly in octahedral coordination in macropores, as opposed to tetrahedral coordination in mesopores. The difference in Zn coordination may be the result of complexation at different surface sites and/or the precipitation of a zinc silicate in mesopores. Confinement effects within mesopores represent an emerging frontier in aqueous geochemistry, and the pursuit of a mechanistic understanding will contribute to more accurate models of reactive transport in porous media. JF - American Geophysical Union Fall Meeting AU - Nelson, J AU - Bargar, J AU - Brown, G E AU - Maher, K AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H31E EP - 1230 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1696873508?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Enhanced+retention+of+aqueous+transition+metals+in+mesoporous+silica&rft.au=Nelson%2C+J%3BBargar%2C+J%3BBrown%2C+G+E%3BMaher%2C+K%3BAnonymous&rft.aulast=Nelson&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-17 N1 - CODEN - #07548 ER - TY - JOUR T1 - Pressure induced HP/LP phase boundary investigation in BiNiO3 system using nanoscale tomography AN - 1692740633; 2015-059230 AB - BiNiO3 was reported to have colossal negative thermal expansion under high pressure/temperature while the phase transition happens around 3-5 GPa accompanying the charge transfer between Ni and Bi. Combining with x-ray absorption spectroscopy of Ni with 3d tomography, we successfully distinguished the absorption spectrum of each reconstructed voxel of the studied sample in diamond anvil cell, thus the detail spatial distribution of HP/LP phase were determined. Within the pressure range 3-5 GPa, we observed the evolution of phase boundary, and growth of high pressure at tens of nanometer length scale. This high resolution phase separation capability provides a unique route to understand the pressure induced phase transition mechanism in general. JF - American Geophysical Union Fall Meeting AU - Yang, W AU - Liu, Yijin AU - Wang, Junyue AU - Azuma, M AU - Mao, W L AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract MR31A EP - 2259 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692740633?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Pressure+induced+HP%2FLP+phase+boundary+investigation+in+BiNiO3+system+using+nanoscale+tomography&rft.au=Yang%2C+W%3BLiu%2C+Yijin%3BWang%2C+Junyue%3BAzuma%2C+M%3BMao%2C+W+L%3BAnonymous&rft.aulast=Yang&rft.aufirst=W&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Investigation of phase transitions of iron under extreme dynamic compression with XANES measurements at LCLS AN - 1689591274; 2015-056631 AB - An accurate knowledge of the properties of iron alloys at high pressures and temperatures is crucial for geophysics and planetary science. In particular, detailed information on melting curves and solid phases are required to anchor the Earth's thermal profile at the Inner-Outer Core Boundary (IOCB) and to assess the solid or liquid nature of exoplanets cores. In that context, X-ray FEL sources coupled with high-energy lasers are affording unique opportunities to measure microscopic structural properties at extreme conditions. Here we present a recent study devoted to investigate the solid-liquid transition in laser-shocked iron using X-ray Absorption Near-Edge Spectroscopy (XANES). The experiment was performed at the MEC end-station of the LCLS facility at SLAC in Stanford. A detailed theoretical study based on ab-initio calculations will be presented and compared to experimental measurements. JF - American Geophysical Union Fall Meeting AU - Harmand, Marion AU - Denoeud, Adrien AU - Benuzzi-Mounaix, Alessandra AU - Vinci, T AU - Brambrink, Erik AU - Koenig, Michel AU - Dorchies, F AU - Gaudin, J AU - Fourment, C AU - Peyrusse, O AU - Nagler, B AU - Galtier, E AU - Lee, Hae AU - Feng, Y AU - Zhu, D AU - Guyot, Francois J AU - Morard, Guillaume AU - Ozaki, Norimasa AU - Myanishi, K AU - Toleikis, Sven AU - Tschentscher, Thomas AU - Nakatsutsumi, Motoaki AU - Recoules, Vanina AU - Bouchet, Johann AU - Mazevet, Stephane AU - Ravasio, Alessandra AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract MR23B EP - 2357 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1689591274?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Investigation+of+phase+transitions+of+iron+under+extreme+dynamic+compression+with+XANES+measurements+at+LCLS&rft.au=Harmand%2C+Marion%3BDenoeud%2C+Adrien%3BBenuzzi-Mounaix%2C+Alessandra%3BVinci%2C+T%3BBrambrink%2C+Erik%3BKoenig%2C+Michel%3BDorchies%2C+F%3BGaudin%2C+J%3BFourment%2C+C%3BPeyrusse%2C+O%3BNagler%2C+B%3BGaltier%2C+E%3BLee%2C+Hae%3BFeng%2C+Y%3BZhu%2C+D%3BGuyot%2C+Francois+J%3BMorard%2C+Guillaume%3BOzaki%2C+Norimasa%3BMyanishi%2C+K%3BToleikis%2C+Sven%3BTschentscher%2C+Thomas%3BNakatsutsumi%2C+Motoaki%3BRecoules%2C+Vanina%3BBouchet%2C+Johann%3BMazevet%2C+Stephane%3BRavasio%2C+Alessandra%3BAnonymous&rft.aulast=Harmand&rft.aufirst=Marion&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Iron and sulfur geochemistry in class H wellbore cements exposed to CO (sub 2) and H (sub 2) S AN - 1645572014; 2015-006110 AB - The effects of CO (sub 2) & co-constituents (such as H (sub 2) S) sequestration on cement seal integrity are not well understood in the context of wellbore integrity for CO (sub 2) storage. This study evaluates the redox effects that co-contaminants such as H (sub 2) S present to the CO (sub 2) -cement reaction system via synchrotron X-ray XANES mapping specific to the iron and sulfur edge energies. Portland Class H cement was exposed to various proportions of H (sub 2) S:CO (sub 2) in 1% NaCl saturated brine (1%, 21 mol%, and 40% H (sub 2) S) under supercritical conditions (50 degrees C and 15 MPa). The reaction of cement with H (sub 2) S-CO (sub 2) results in the formation of pyrite associated with the Fe-rich cement clinker phase, brownmillerite (also termed ferrite). Ferrite has not reacted in previous exposures to CO (sub 2) alone, which was confirmed by synchrotron spectroscopic analysis of cement exposed to supercritical CO (sub 2) alone. Thus it is hypothesized that the reaction is a result of redox conditions introduced by H (sub 2) S. The synchrotron X-ray microprobe fluorescence (mu XRF) imaging and spectroscopy capabilities at beamlines 2-3 and 14-3 at SSRL were used to collect multiple energy (ME) maps for both Fe and S in order to evaluate reaction fronts in the cement matrix and to monitor the chemical changes in the cement associated with exposure to CO (sub 2) (and H (sub 2) S) at sequestration conditions. The use of this micro-spectroscopy technique allows for in-situ identification of any reaction intermediates (including amorphous materials) for the Fe and S phases in the cement. The coupled mu XANES and mu XRF data were used to generate iron and S speciation maps of the cement cores. Synchrotron microprobe capabilities at 2-3 were used to collected ME maps of Fe, and show differences in Fe oxidation between the rims (Fe (super 2+) ) and cores (Fe (super 3+) ) of the cement thin section. Analysis of Fe XANES indicates that there are potentially 4+ distinct coordination environments for the Fe in the cement cores studied: pyrite, ferrihydrite, brownmillerite (Fe (super 3+) , and/or Fe (super 2+) ) and potentially amorphous Fe-S. In a similar manner, S was evaluated by collecting multiple energy maps through the S-edge using beamline 14-3 at SSRL. The S ME maps revealed much broader reaction fronts as revealed by the iron mapping alone. Analysis of S XANES spectra is ongoing, but preliminary results indicate that possibly 6 different binding environments are likely in the cements depending on the H (sub 2) S concentration: FeS, FeS (sub 2) , S, a sulfite phase, and potentially two different sulfates (gypsum and ettringite). The results indicate that S oxidation state likely grades from S (super +6) in the core of the cement to S (super -1) in the rim of the cement, with S oxidation states ranging from S (super 4+) to S (super 0) in zones in between. This work will serve to better understand the geochemical reactions in the cement upon addition of S co-constituents in order to better assess potential impacts on long-term cement integrity. JF - American Geophysical Union Fall Meeting AU - Lopano, Christina L AU - Webb, Sam M AU - Kutchko, Barbara G AU - Strazisar, Brian R AU - Hawthorne, S B AU - Miller, D J AU - Guthrie, George AU - Hakala, Alexandra AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract V31D EP - 06 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645572014?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Iron+and+sulfur+geochemistry+in+class+H+wellbore+cements+exposed+to+CO+%28sub+2%29+and+H+%28sub+2%29+S&rft.au=Lopano%2C+Christina+L%3BWebb%2C+Sam+M%3BKutchko%2C+Barbara+G%3BStrazisar%2C+Brian+R%3BHawthorne%2C+S+B%3BMiller%2C+D+J%3BGuthrie%2C+George%3BHakala%2C+Alexandra%3BAnonymous&rft.aulast=Lopano&rft.aufirst=Christina&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - CPAPER T1 - Parameterization of An Adsorbate-Adsorbate Interaction Model for Catalytic Trend Studies T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490523340; 6249803 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Khan, Tuhin AU - Falsig, Hanne AU - Guo, Wei AU - Wang, Shengguang AU - Dahl, Soren AU - Bligaard, Thomas Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490523340?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Journal+of+Pharmaceutical+Education&rft.atitle=Writing+Skills+of+Advanced+Pharmacy+Practice+Experience+Students+Whose+First+or+Best+Language+Is+Not+English&rft.au=Diaz-Gilbert%2C+Miriam&rft.aulast=Diaz-Gilbert&rft.aufirst=Miriam&rft.date=2005-01-01&rft.volume=69&rft.issue=1-5&rft.spage=L1&rft.isbn=&rft.btitle=&rft.title=American+Journal+of+Pharmaceutical+Education&rft.issn=00029459&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Strong Surfactant-Dependent Lift Forces On Drops and Bubbles in Microchannels T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490518682; 6249906 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Stan, Claudiu AU - Guglielmini, Laura AU - Ellerbee, Audrey AU - Caviezel, Daniel AU - Whitesides, George AU - Stone, Howard Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Chemical engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490518682?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Strong+Surfactant-Dependent+Lift+Forces+On+Drops+and+Bubbles+in+Microchannels&rft.au=Stan%2C+Claudiu%3BGuglielmini%2C+Laura%3BEllerbee%2C+Audrey%3BCaviezel%2C+Daniel%3BWhitesides%2C+George%3BStone%2C+Howard&rft.aulast=Stan&rft.aufirst=Claudiu&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Ambient Pressure XPS Observation of Electrode Surfaces During Electrochemical Reactions T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490518454; 6253774 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Ogsawara, Hirohito AU - Sanchez Casalongue, Hernan AU - Kaya, Sarp AU - Miller, Daniel AU - Friebel, Daniel AU - Nilsson, Anders Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Electrodes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490518454?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Ambient+Pressure+XPS+Observation+of+Electrode+Surfaces+During+Electrochemical+Reactions&rft.au=Ogsawara%2C+Hirohito%3BSanchez+Casalongue%2C+Hernan%3BKaya%2C+Sarp%3BMiller%2C+Daniel%3BFriebel%2C+Daniel%3BNilsson%2C+Anders&rft.aulast=Ogsawara&rft.aufirst=Hirohito&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Observing Ice Nucleation From Water Microdroplet Freezing Below "Homogenous Nucleation Temperature Limit" T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490517148; 6253546 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Laksmono, Hartawan AU - McQueen, Trevor AU - Sellberg, Jonas AU - Huang, Congcong AU - Loh, Duane AU - Sierra, Raymond AU - Starodub, Dmitri AU - Norlund, Dennis AU - Beye, Martin AU - DePonte, Daniel AU - Martin, Andrew AU - Barty, Anton AU - Feldkamp, Jan AU - Boutet, Sebastien AU - Williams, Garth AU - Bogan, Michael AU - Nilsson, Anders Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Temperature UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490517148?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Observing+Ice+Nucleation+From+Water+Microdroplet+Freezing+Below+%22Homogenous+Nucleation+Temperature+Limit%22&rft.au=Laksmono%2C+Hartawan%3BMcQueen%2C+Trevor%3BSellberg%2C+Jonas%3BHuang%2C+Congcong%3BLoh%2C+Duane%3BSierra%2C+Raymond%3BStarodub%2C+Dmitri%3BNorlund%2C+Dennis%3BBeye%2C+Martin%3BDePonte%2C+Daniel%3BMartin%2C+Andrew%3BBarty%2C+Anton%3BFeldkamp%2C+Jan%3BBoutet%2C+Sebastien%3BWilliams%2C+Garth%3BBogan%2C+Michael%3BNilsson%2C+Anders&rft.aulast=Laksmono&rft.aufirst=Hartawan&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Polymorph and Morphology Control of Organic Semiconductor Thin Films T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490513922; 6252284 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Diao, Ying AU - Mannsfeld, Stefan AU - Bao, Zhenan Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Morphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490513922?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Polymorph+and+Morphology+Control+of+Organic+Semiconductor+Thin+Films&rft.au=Diao%2C+Ying%3BMannsfeld%2C+Stefan%3BBao%2C+Zhenan&rft.aulast=Diao&rft.aufirst=Ying&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Bayesian Error Estimation Functionals for Surface Science Applications T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490506792; 6250848 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Bligaard, Thomas Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Bayesian analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490506792?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Bayesian+Error+Estimation+Functionals+for+Surface+Science+Applications&rft.au=Bligaard%2C+Thomas&rft.aulast=Bligaard&rft.aufirst=Thomas&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Microfluidic Electrokinetic Sample Holder for Serial Femtosecond Crystallography T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490506426; 6251717 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Sierra, Raymond AU - Laksmono, Hartawan AU - Bogan, Michael Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Microfluidics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490506426?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Microfluidic+Electrokinetic+Sample+Holder+for+Serial+Femtosecond+Crystallography&rft.au=Sierra%2C+Raymond%3BLaksmono%2C+Hartawan%3BBogan%2C+Michael&rft.aulast=Sierra&rft.aufirst=Raymond&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=02614448&rft_id=info:doi/10.1017%2FS0261444812000559 L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Methanol Synthesis From CO2 - Experiment and Theory T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490505269; 6251641 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Studt, Felix AU - Abild-Pedersen, Frank AU - Norskov, Jens Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Methanol UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490505269?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Methanol+Synthesis+From+CO2+-+Experiment+and+Theory&rft.au=Studt%2C+Felix%3BAbild-Pedersen%2C+Frank%3BNorskov%2C+Jens&rft.aulast=Studt&rft.aufirst=Felix&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - JOUR T1 - Properties of impurity-bearing ferrihydrite; II, Insights into the surface structure and composition of pure, Al and Si-bearing ferrihydrite from Zn(II) sorption experiments and Zn K-edge X-ray absorption spectroscopy AN - 1442373434; 2013-080142 AB - Naturally occurring ferrihydrite often contains impurities such as Al and Si, which can impact its chemical reactivity with respect to metal(loid) adsorption and (in)organic or microbially induced reductive dissolution. However, the surface composition of impure ferrihydrites is not well constrained, and this hinders our understanding of the factors controlling the surface reactivity of these nanophases. In this study, we conducted Zn(II) adsorption experiments combined with Zn K-edge X-ray absorption spectroscopy measurements on pure ferrihydrite (Fh) and Al- or Si-bearing ferrihydrites containing 10 and 20mol% Al or Si (referred to as 10AlFh, 20AlFh and 10SiFh, 20SiFh) to evaluate Zn(II) uptake in relation to Zn(II) speciation at their surfaces. Overall, Zn(II) uptake at the surface of AlFh is similar to that of pure Fh, and based on Zn K-edge EXAFS data, Zn(II) speciation at the surface of Fh and AlFh also appears similar. Binuclear bidentate (super IV) Zn- (super VI) Fe complexes (at approximately 3.46A ( (super 2) C[1]) and approximately 3.25A ( (super 2) C[2])) were identified at low Zn(II) surface coverages from Zn K-edge EXAFS fits. With increasing Zn(II) surface coverage, the number of second-neighbor Fe ions decreased, which was interpreted as indicating the formation of (super IV) Zn polymers at the ferrihydrite surface, and a deviation from Langmuir uptake behavior. Zn(II) uptake at the surface of SiFh samples was more significant than at Fh and AlFh surfaces, and was attributed to the formation of outer-sphere complexes (on average 24% of sorbed Zn). Although similar Zn-Fe/Zn distances were obtained for the Zn-sorbed SiFh samples, the number of Fe second neighbors was lower in comparison with Fh. The decrease in second-neighbor Fe is most pronounced for sample 20SiFh, suggesting that the amount of reactive surface Fe sites diminishes with increasing Si content. Although our EXAFS results shown here do not provide evidence for the existence of Zn-Al or Zn-Si complexes, their presence is not excluded for Zn-sorbed AlFh or SiFh. The results of this study indicate that Zn(II) interaction with Fh is influenced by the type of impurities associated with this nanomineral, particularly in the case of Si-bearing Fh, and this may have implications for our understanding of metal(loid) mobility in natural systems. Abstract Copyright (2013) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Cismasu, A Cristina AU - Levard, Clement AU - Michel, F Marc AU - Brown, Gordon E, Jr Y1 - 2013/10/15/ PY - 2013 DA - 2013 Oct 15 SP - 46 EP - 60 PB - Elsevier, New York, NY VL - 119 SN - 0016-7037, 0016-7037 KW - zinc KW - crystal structure KW - reactivity KW - silica KW - aluminum KW - oxides KW - spectra KW - chemical composition KW - surface properties KW - toxic materials KW - pollutants KW - impurities KW - biochemistry KW - pollution KW - properties KW - solubility KW - ferrihydrite KW - biogenic processes KW - metals KW - EXAFS data KW - mobilization KW - crystal chemistry KW - nanoparticles KW - microorganisms KW - chemical fractionation KW - 22:Environmental geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442373434?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Properties+of+impurity-bearing+ferrihydrite%3B+II%2C+Insights+into+the+surface+structure+and+composition+of+pure%2C+Al+and+Si-bearing+ferrihydrite+from+Zn%28II%29+sorption+experiments+and+Zn+K-edge+X-ray+absorption+spectroscopy&rft.au=Cismasu%2C+A+Cristina%3BLevard%2C+Clement%3BMichel%2C+F+Marc%3BBrown%2C+Gordon+E%2C+Jr&rft.aulast=Cismasu&rft.aufirst=A&rft.date=2013-10-15&rft.volume=119&rft.issue=&rft.spage=46&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2013.05.040 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 55 N1 - PubXState - NY N1 - Document feature - illus. incl. 4 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-10-17 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - aluminum; biochemistry; biogenic processes; chemical composition; chemical fractionation; crystal chemistry; crystal structure; EXAFS data; ferrihydrite; impurities; metals; microorganisms; mobilization; nanoparticles; oxides; pollutants; pollution; properties; reactivity; silica; solubility; spectra; surface properties; toxic materials; zinc DO - http://dx.doi.org/10.1016/j.gca.2013.05.040 ER - TY - JOUR T1 - PROBING THE COSMIC X-RAY AND MeV GAMMA-RAY BACKGROUND RADIATION THROUGH THE ANISOTROPY AN - 1709164846; PQ0001859088 AB - While the cosmic soft X-ray background is very likely to originate from individual Seyfert galaxies, the origin of the cosmic hard X-ray and MeV gamma-ray background is not fully understood. It is expected that Seyferts including Compton thick population may explain the cosmic hard X-ray background. At MeV energy range, Seyferts having non-thermal electrons in coronae above accretion disks or MeV blazars may explain the background radiation. We propose that future measurements of the angular power spectra of anisotropy of the cosmic X-ray and MeV gamma-ray backgrounds will be key to deciphering these backgrounds and the evolution of active galactic nuclei (AGNs). As AGNs trace the cosmic large-scale structure, spatial clustering of AGNs exists. We show that e-ROSITA will clearly detect the correlation signal of unresolved Seyferts at 0.5-2 keV and 2-10 keV bands and will be able to measure the bias parameter of AGNs at both bands. Once future hard X-ray all sky satellites achieve a sensitivity better than 10 super(-12) erg cm super(-2) s super(-1) at 10-30 keV or 30-50 keV-although this is beyond the sensitivities of current hard X-ray all sky monitors-angular power spectra will allow us to independently investigate the fraction of Compton-thick AGNs in all Seyferts. We also find that the expected angular power spectra of Seyferts and blazars in the MeV range are different by about an order of magnitude, where the Poisson term, so-called shot noise, is dominant. Current and future MeV instruments will clearly disentangle the origin of the MeV gamma-ray background through the angular power spectrum. JF - Astrophysical Journal AU - Inoue, Yoshiyuki AU - Murase, Kohta AU - Madejski, Grzegorz M AU - Uchiyama, Yasunobu AD - Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, Stanford University and SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA, yinoue@slac.stanford.edu Y1 - 2013/10/10/ PY - 2013 DA - 2013 Oct 10 SP - 1 EP - 14 PB - IOP Publishing, The Public Ledger Building, Suite 929 Philadelphia PA 19106 United States VL - 776 IS - 1 SN - 0004-637X, 0004-637X KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - diffuse radiation KW - galaxies: active KW - gamma rays: diffuse background KW - gamma rays: general KW - X-rays: diffuse background KW - Corona KW - Sensitivity KW - Active galactic nuclei KW - Coronal studies KW - Anisotropy KW - Acoustic waves KW - Power spectra KW - Gamma-radiation KW - Remote sensing KW - Galaxies KW - Black holes KW - Hard X-rays KW - Satellites KW - Satellite data KW - Radiation KW - Energy KW - Cosmic radiation KW - Noise pollution KW - Quasars KW - P 7000:NOISE KW - M2 524:Stars, Universe (524) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1709164846?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrophysical+Journal&rft.atitle=PROBING+THE+COSMIC+X-RAY+AND+MeV+GAMMA-RAY+BACKGROUND+RADIATION+THROUGH+THE+ANISOTROPY&rft.au=Inoue%2C+Yoshiyuki%3BMurase%2C+Kohta%3BMadejski%2C+Grzegorz+M%3BUchiyama%2C+Yasunobu&rft.aulast=Inoue&rft.aufirst=Yoshiyuki&rft.date=2013-10-10&rft.volume=776&rft.issue=1&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F776%2F1%2F33 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-09-01 N1 - Last updated - 2015-11-16 N1 - SubjectsTermNotLitGenreText - Corona; Active galactic nuclei; Anisotropy; Coronal studies; Acoustic waves; Gamma-radiation; Power spectra; Black holes; Galaxies; Hard X-rays; Satellite data; Radiation; Noise pollution; Quasars; Sensitivity; Energy; Cosmic radiation; Remote sensing; Satellites DO - http://dx.doi.org/10.1088/0004-637X/776/1/33 ER - TY - JOUR T1 - Bonding and electronic changes in rhodochrosite at high pressure AN - 1447102808; 2013-084928 AB - Atmospheric carbon is critical for maintaining the climate and life equilibrium on Earth. The concentration of this carbon is controlled by the deep carbon cycle, which is responsible for the billion year-scale evolution of the terrestrial carbon reservoirs of the planet. Understanding the crystal chemistry and physical properties of carbonates at mantle conditions is vital as they represent the main oxidized carbon-bearing phases in the Earth's mantle. Here we present data on the crystal chemistry and physical properties of rhodochrosite at high pressure. Rhodochrosite (MnCO (sub 3) ) exhibits a series of high-pressure transitions between 15 and 30 GPa and at 50 GPa at ambient temperature as observed by in situ Raman spectroscopy, X-ray diffraction (XRD), and X-ray emission spectroscopy (XES). A transition is observed to begin at 15 GPa and complete at 30 GPa, which may be due to several possibilities: modifications in the magnetic order, changes in the compression mechanism, and/or a structural transition resulting from disorder. We also observed a first-order phase transition of MnCO (sub 3) at 50 GPa, which is not accompanied by any changes in the electronic spin state. These results highlight the unique behavior of MnCO (sub 3) , which we found to be quite different from other common carbonates such as siderite, magnesite, and calcite. JF - American Mineralogist AU - Farfan, Gabriela A AU - Boulard, Eglantine AU - Wang, Shibing AU - Mao, Wendy L Y1 - 2013/10// PY - 2013 DA - October 2013 SP - 1817 EP - 1823 PB - Mineralogical Society of America, Washington, DC VL - 98 IS - 10 SN - 0003-004X, 0003-004X KW - experimental studies KW - pressure KW - X-ray diffraction data KW - mantle KW - magnesite KW - phase transitions KW - bonding KW - rhodochrosite KW - high pressure KW - X-ray spectra KW - geochemical cycle KW - calcite KW - ultrahigh pressure KW - siderite KW - Raman spectra KW - manganese minerals KW - carbon KW - spectra KW - carbon cycle KW - crystal chemistry KW - compression KW - carbonates KW - 17B:Geophysics of minerals and rocks UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1447102808?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Mineralogist&rft.atitle=Bonding+and+electronic+changes+in+rhodochrosite+at+high+pressure&rft.au=Farfan%2C+Gabriela+A%3BBoulard%2C+Eglantine%3BWang%2C+Shibing%3BMao%2C+Wendy+L&rft.aulast=Farfan&rft.aufirst=Gabriela&rft.date=2013-10-01&rft.volume=98&rft.issue=10&rft.spage=1817&rft.isbn=&rft.btitle=&rft.title=American+Mineralogist&rft.issn=0003004X&rft_id=info:doi/10.2138%2Fam.2013.4497 L2 - http://www.minsocam.org/MSA/AmMin/TOC/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 41 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2013-10-31 N1 - CODEN - AMMIAY N1 - SubjectsTermNotLitGenreText - bonding; calcite; carbon; carbon cycle; carbonates; compression; crystal chemistry; experimental studies; geochemical cycle; high pressure; magnesite; manganese minerals; mantle; phase transitions; pressure; Raman spectra; rhodochrosite; siderite; spectra; ultrahigh pressure; X-ray diffraction data; X-ray spectra DO - http://dx.doi.org/10.2138/am.2013.4497 ER - TY - JOUR T1 - Brine film thicknesses on mica surfaces under geologic CO (sub 2) sequestration conditions and controlled capillary pressures AN - 1464884723; 2013-095564 AB - Brine films remaining on mineral surfaces in deep reservoirs during CO (sub 2) sequestration are expected to influence multiphase flow, diffusion, and reactions, but little is known about their behavior. Using synchrotron X-ray fluorescence (XRF), we measured thicknesses of KCsI (sub 2) brine films on two difference roughness mica surfaces under conditions representative of geological CO (sub 2) sequestration (7.8 MPa and 40 degrees C) to understand the influences of mineral surface roughness and capillary potential. Brine thicknesses measured on the Mica 1 (smooth) and Mica 2 (rough) mica surfaces ranged from 23 to 8 nm and 491 to 412 nm, respectively, over the small range of tested capillary potentials (0.18-3.7 kPa). Within these potentials, brine film thicknesses on mica were governed by surface roughness and only weakly influenced by capillary potentials. In comparing drainage and rewetting isotherms, some film thickness hysteresis was observed, possibly indicative of changes in mica wettability. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Water Resources Research AU - Kim, Tae Wook AU - Tokunaga, Tetsu K AU - Bargar, John R AU - Latimer, Matthew J AU - Webb, Samuel M Y1 - 2013/08// PY - 2013 DA - August 2013 SP - 5071 EP - 5076 PB - American Geophysical Union, Washington, DC VL - 49 IS - 8 SN - 0043-1397, 0043-1397 KW - silicates KW - surface properties KW - experimental studies KW - carbon sequestration KW - capillary pressure KW - X-ray fluorescence KW - numerical analysis KW - carbon dioxide KW - synchrotron radiation KW - mica group KW - brines KW - X-ray analysis KW - sheet silicates KW - 01B:Mineralogy of silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464884723?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Brine+film+thicknesses+on+mica+surfaces+under+geologic+CO+%28sub+2%29+sequestration+conditions+and+controlled+capillary+pressures&rft.au=Kim%2C+Tae+Wook%3BTokunaga%2C+Tetsu+K%3BBargar%2C+John+R%3BLatimer%2C+Matthew+J%3BWebb%2C+Samuel+M&rft.aulast=Kim&rft.aufirst=Tae&rft.date=2013-08-01&rft.volume=49&rft.issue=8&rft.spage=5071&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1002%2Fwrcr.20404 L2 - http://www.agu.org/journals/wr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 41 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2013-12-05 N1 - CODEN - WRERAQ N1 - SubjectsTermNotLitGenreText - brines; capillary pressure; carbon dioxide; carbon sequestration; experimental studies; mica group; numerical analysis; sheet silicates; silicates; surface properties; synchrotron radiation; X-ray analysis; X-ray fluorescence DO - http://dx.doi.org/10.1002/wrcr.20404 ER - TY - JOUR T1 - Ultrafast three-dimensional imaging of lattice dynamics in individual gold nanocrystals AN - 1420517248; 2013-065627 AB - Key insights into the behavior of materials can be gained by observing their structure as they undergo lattice distortion. Laser pulses on the femtosecond time scale can be used to induce disorder in a "pump-probe" experiment with the ensuing transients being probed stroboscopically with femtosecond pulses of visible light, x-rays, or electrons. Here we report three-dimensional imaging of the generation and subsequent evolution of coherent acoustic phonons on the picosecond time scale within a single gold nanocrystal by means of an x-ray free-electron laser, providing insights into the physics of this phenomenon. Our results allow comparison and confirmation of predictive models based on continuum elasticity theory and molecular dynamics simulations. JF - Science AU - Clark, J N AU - Beitra, L AU - Xiong, G AU - Higginbotham, A AU - Fritz, D M AU - Lemke, H T AU - Zhu, D AU - Chollet, M AU - Williams, G J AU - Messerschmidt, M AU - Abbey, B AU - Harder, R J AU - Korsunsky, A M AU - Wark, J S AU - Robinson, I K Y1 - 2013/07/05/ PY - 2013 DA - 2013 Jul 05 SP - 56 EP - 59 PB - American Association for the Advancement of Science, Washington, DC VL - 341 IS - 6141 SN - 0036-8075, 0036-8075 KW - imagery KW - experimental studies KW - elasticity KW - numerical models KW - lattice KW - three-dimensional models KW - crystal structure KW - simulation KW - X-ray spectra KW - nanocrystals KW - laboratory studies KW - dynamics KW - metals KW - applications KW - spectra KW - gold KW - 01A:General mineralogy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1420517248?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Ultrafast+three-dimensional+imaging+of+lattice+dynamics+in+individual+gold+nanocrystals&rft.au=Clark%2C+J+N%3BBeitra%2C+L%3BXiong%2C+G%3BHigginbotham%2C+A%3BFritz%2C+D+M%3BLemke%2C+H+T%3BZhu%2C+D%3BChollet%2C+M%3BWilliams%2C+G+J%3BMesserschmidt%2C+M%3BAbbey%2C+B%3BHarder%2C+R+J%3BKorsunsky%2C+A+M%3BWark%2C+J+S%3BRobinson%2C+I+K&rft.aulast=Clark&rft.aufirst=J&rft.date=2013-07-05&rft.volume=341&rft.issue=6141&rft.spage=56&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1236034 L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 28 N1 - PubXState - DC N1 - Document feature - illus. N1 - SuppNotes - Related article by Hartland, G. V. and Lo, S. S., on p. 36-37 N1 - Last updated - 2013-08-15 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - applications; crystal structure; dynamics; elasticity; experimental studies; gold; imagery; laboratory studies; lattice; metals; nanocrystals; numerical models; simulation; spectra; three-dimensional models; X-ray spectra DO - http://dx.doi.org/10.1126/science.1236034 ER - TY - JOUR T1 - Simultaneous Femtosecond X-ray Spectroscopy and Diffraction of Photosystem II at Room Temperature AN - 1808125997; 20373658 AB - One Protein, Two ProbesA central challenge in the use of x-ray diffraction to characterize macromolecular structure is the propensity of the high-energy radiation to damage the sample during data collection. Recently, a powerful accelerator-based, ultrafast x-ray laser source has been used to determine the geometric structures of small protein crystals too fragile for conventional diffraction techniques. Kern et al. (p. 491, published online 14 February) now pair this method with concurrent x-ray emission spectroscopy to probe electronic structure, as well as geometry, and were able to characterize the metal oxidation states in the oxygen-evolving complex within photosystem II crystals, while simultaneously verifying the surrounding protein structure. JF - Science AU - Kern, Jan AU - Alonso-Mori, Roberto AU - Tran, Rosalie AU - Hattne, Johan AU - Gildea, Richard J AU - Echols, Nathaniel AU - Glockner, Carina AU - Hellmich, Julia AU - Laksmono, Hartawan AU - Sierra, Raymond G AU - Lassalle-Kaiser, Benedikt AU - Koroidov, Sergey AU - Lampe, Alyssa AU - Han, Guangye AU - Gul, Sheraz AU - DiFiore, Dorte AU - Milathianaki, Despina AU - Fry, Alan R AU - Miahnahri, Alan AU - Schafer, Donald W AU - Messerschmidt, Marc AU - Seibert, MMarvin AU - Koglin, Jason E AU - Sokaras, Dimosthenis AU - Weng, Tsu-Chien AU - Sellberg, Jonas AU - Latimer, Matthew J AU - Grosse-Kunstleve, Ralf W AU - Zwart, Petrus H AU - White, William E AU - Glatzel, Pieter AU - Adams, Paul D AU - Bogan, Michael J AU - Williams, Garth J AU - Boutet, Sebastien AU - Messinger, Johannes AU - Zouni, Athina AU - Sauter, Nicholas K AU - Yachandra, Vittal K AU - Bergmann, Uwe AU - Yano, Junko AD - Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA Y1 - 2013/04/26/ PY - 2013 DA - 2013 Apr 26 SP - 491 EP - 495 PB - American Association for the Advancement of Science, 1200 New York Avenue, NW Washington DC 20005 United States VL - 340 IS - 6131 SN - 0036-8075, 0036-8075 KW - Solid State and Superconductivity Abstracts (SO); Environmental Engineering Abstracts (EN) KW - X-rays KW - Dichroism KW - Aluminum KW - Crystal structure KW - Proteins KW - Diffraction KW - Femtosecond KW - X-ray sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1808125997?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Simultaneous+Femtosecond+X-ray+Spectroscopy+and+Diffraction+of+Photosystem+II+at+Room+Temperature&rft.au=Kern%2C+Jan%3BAlonso-Mori%2C+Roberto%3BTran%2C+Rosalie%3BHattne%2C+Johan%3BGildea%2C+Richard+J%3BEchols%2C+Nathaniel%3BGlockner%2C+Carina%3BHellmich%2C+Julia%3BLaksmono%2C+Hartawan%3BSierra%2C+Raymond+G%3BLassalle-Kaiser%2C+Benedikt%3BKoroidov%2C+Sergey%3BLampe%2C+Alyssa%3BHan%2C+Guangye%3BGul%2C+Sheraz%3BDiFiore%2C+Dorte%3BMilathianaki%2C+Despina%3BFry%2C+Alan+R%3BMiahnahri%2C+Alan%3BSchafer%2C+Donald+W%3BMesserschmidt%2C+Marc%3BSeibert%2C+MMarvin%3BKoglin%2C+Jason+E%3BSokaras%2C+Dimosthenis%3BWeng%2C+Tsu-Chien%3BSellberg%2C+Jonas%3BLatimer%2C+Matthew+J%3BGrosse-Kunstleve%2C+Ralf+W%3BZwart%2C+Petrus+H%3BWhite%2C+William+E%3BGlatzel%2C+Pieter%3BAdams%2C+Paul+D%3BBogan%2C+Michael+J%3BWilliams%2C+Garth+J%3BBoutet%2C+Sebastien%3BMessinger%2C+Johannes%3BZouni%2C+Athina%3BSauter%2C+Nicholas+K%3BYachandra%2C+Vittal+K%3BBergmann%2C+Uwe%3BYano%2C+Junko&rft.aulast=Kern&rft.aufirst=Jan&rft.date=2013-04-26&rft.volume=340&rft.issue=6131&rft.spage=491&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1234273 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-08-01 N1 - Last updated - 2016-08-03 DO - http://dx.doi.org/10.1126/science.1234273 ER - TY - JOUR T1 - Uranium redox transition pathways in acetate-amended sediments AN - 1729847862; 2015-105465 AB - Redox transitions of uranium [from U(VI) to U(IV)] in low-temperature sediments govern the mobility of uranium in the environment and the accumulation of uranium in ore bodies, and inform our understanding of Earth's geochemical history. The molecular-scale mechanistic pathways of these transitions determine the U(IV) products formed, thus influencing uranium isotope fractionation, reoxidation, and transport in sediments. Studies that improve our understanding of these pathways have the potential to substantially advance process understanding across a number of earth sciences disciplines. Detailed mechanistic information regarding uranium redox transitions in field sediments is largely nonexistent, owing to the difficulty of directly observing molecular-scale processes in the subsurface and the compositional/physical complexity of subsurface systems. Here, we present results from an in situ study of uranium redox transitions occurring in aquifer sediments under sulfate-reducing conditions. Based on molecular-scale spectroscopic, pore-scale geochemical, and macroscale aqueous evidence, we propose a biotic-abiotic transition pathway in which biomass-hosted mackinawite (FeS) is an electron source to reduce U(VI) to U(IV), which subsequently reacts with biomass to produce monomeric U(IV) species. A species resembling nanoscale uraninite is also present, implying the operation of at least two redox transition pathways. The presence of multiple pathways in low-temperature sediments unifies apparently contrasting prior observations and helps to explain sustained uranium reduction under disparate biogeochemical conditions. These findings have direct implications for our understanding of uranium bioremediation, ore formation, and global geochemical processes. JF - Proceedings of the National Academy of Sciences of the United States of America AU - Bargar, John R AU - Williams, Kenneth H AU - Campbell, Kate M AU - Long, Philip E AU - Stubbs, Joanne E AU - Suvorova, Elenal I AU - Lezama-Pacheco, Juan S AU - Alessi, Daniel S AU - Stylo, Malgorzata AU - Webb, Samuel M AU - Davis, James A AU - Giammar, Daniel E AU - Blue, Lisa Y AU - Bernier-Latmani, Rizlan Y1 - 2013/03/19/ PY - 2013 DA - 2013 Mar 19 SP - 4506 EP - 4511 PB - National Academy of Sciences, Washington, DC VL - 110 IS - 12 SN - 0027-8424, 0027-8424 KW - complexing KW - mechanism KW - XANES spectra KW - Rifle Integrated Field Research Challenge KW - laboratory studies KW - Rifle Colorado KW - valency KW - reduction KW - experimental studies KW - sulfate ion KW - in situ KW - electron microscopy data KW - X-ray spectra KW - TEM data KW - uranium ores KW - organic compounds KW - metal ores KW - uranium KW - mobilization KW - Colorado KW - SEM data KW - microorganisms KW - field studies KW - United States KW - mineral deposits, genesis KW - Garfield County Colorado KW - iron KW - ground water KW - mackinawite KW - chemical reactions KW - sediments KW - oxides KW - spectra KW - water pollution KW - Eh KW - esters KW - acetates KW - pollution KW - aquifers KW - biogenic processes KW - sandstone-type deposits KW - metals KW - sulfur KW - X-ray microprobe data KW - shallow aquifers KW - uraninite KW - sulfides KW - northwestern Colorado KW - actinides KW - 27A:Economic geology, geology of ore deposits KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1729847862?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.atitle=Uranium+redox+transition+pathways+in+acetate-amended+sediments&rft.au=Bargar%2C+John+R%3BWilliams%2C+Kenneth+H%3BCampbell%2C+Kate+M%3BLong%2C+Philip+E%3BStubbs%2C+Joanne+E%3BSuvorova%2C+Elenal+I%3BLezama-Pacheco%2C+Juan+S%3BAlessi%2C+Daniel+S%3BStylo%2C+Malgorzata%3BWebb%2C+Samuel+M%3BDavis%2C+James+A%3BGiammar%2C+Daniel+E%3BBlue%2C+Lisa+Y%3BBernier-Latmani%2C+Rizlan&rft.aulast=Bargar&rft.aufirst=John&rft.date=2013-03-19&rft.volume=110&rft.issue=12&rft.spage=4506&rft.isbn=&rft.btitle=&rft.title=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.issn=00278424&rft_id=info:doi/10.1073%2Fpnas.1219198110 L2 - http://www.pnas.org/content/by/year LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. N1 - Date revised - 2015-01-01 N1 - Number of references - 78 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2015-11-05 N1 - CODEN - PNASA6 N1 - SubjectsTermNotLitGenreText - acetates; actinides; aquifers; biogenic processes; chemical reactions; Colorado; complexing; Eh; electron microscopy data; esters; experimental studies; field studies; Garfield County Colorado; ground water; in situ; iron; laboratory studies; mackinawite; mechanism; metal ores; metals; microorganisms; mineral deposits, genesis; mobilization; northwestern Colorado; organic compounds; oxides; pollution; reduction; Rifle Colorado; Rifle Integrated Field Research Challenge; sandstone-type deposits; sediments; SEM data; shallow aquifers; spectra; sulfate ion; sulfides; sulfur; TEM data; United States; uraninite; uranium; uranium ores; valency; water pollution; X-ray microprobe data; X-ray spectra; XANES spectra DO - http://dx.doi.org/10.1073/pnas.1219198110 ER - TY - JOUR T1 - In-situ nanoscale imaging of strain and phase separation under high pressure AN - 1549617114; 2014-057531 AB - Over last decades, both synchrotron radiation techniques and high pressure research have made great progress. Advanced synchrotron capabilities with high spatial resolution, high flux, high energy resolution and high coherence provides us many new avenues to conduct advanced high pressure researches. In this talk, we will mainly focus on the new developments of the nanoscale imaging techniques on the internal strain distribution and pressure induced phase separation in three dimensions. Coherence of the synchrotron beam for high pressure community has been largely ignored due to the complicated sample environment for data interpolation. We have developed a practical "Mutual Coherence Function" to overcome the influence from the sample condition and extrapolated the full coherent diffraction imaging results from a single crystal nanoparticle. The 3d internal strain evolution as a function of applied pressure shows clearly the nanoscale plastic flow cross the nanograin and provides us fundamental deformation mechanism of individual nanocrystal under pressure. The advanced synchrotron optics also provides us tens of nanometer scale 3d tomography resolution, which in return provides detail structural characterization of materials at extreme conditions. By choosing incident x-ray energy near absorption edge, the pressure induced valence transition can be mapped at tens of nanometer scale in 3d, which provides crucial information on the HP-LP phase boundary. Several new experimental results will be presented and outlook will be discussed. JF - Abstracts with Programs - Geological Society of America AU - Yang, Wenge AU - Huang, Xiaojing AU - Wang, Junyue AU - Liu, Yijin AU - Mao, Wendy AU - Mao, Ho-kwang AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 450 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549617114?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=In-situ+nanoscale+imaging+of+strain+and+phase+separation+under+high+pressure&rft.au=Yang%2C+Wenge%3BHuang%2C+Xiaojing%3BWang%2C+Junyue%3BLiu%2C+Yijin%3BMao%2C+Wendy%3BMao%2C+Ho-kwang%3BAnonymous&rft.aulast=Yang&rft.aufirst=Wenge&rft.date=2013-01-01&rft.volume=37&rft.issue=1&rft.spage=62&rft.isbn=&rft.btitle=&rft.title=Anthropology+and+Education+Quarterly&rft.issn=01617761&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper231704.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-31 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Synchrotron-based chemical imaging reveals plumage patterns in Archaeopteryx AN - 1535206424; 2014-041500 AB - Feather and integument color depend on both chemical and structural characteristics. The combination of melanosome morphology (structural) and trace metal biomarkers (chemical) has been used to infer color and pigment patterns in a range of extant and fossil organisms. Melanin is the most widely used pigment in birds and consist of several covalently linked indoles. Melanins are considered unusually large polymers compared to most natural pigments. The sheer size and complexity of these molecules determines their precise structure and physical properties and also controls their bonding to other components (e.g. proteins, metal ions). In this study, three key specimens of Archaeopteryx were subjected to non-destructive chemical analysis in order to investigate the potential for pigment preservation in feathers of this early bird. Synchrotron Rapid Scanning X-ray Fluorescence maps are combined with sulfur X-ray Absorption Near Edge Structure spectroscopy to provide the first map of organic sulfur distribution within whole fossils, and demonstrates that organically derived endogenous compounds are present. The distribution of copper and organic species of sulfur in two Archaeopteryx specimens are strongly controlled by feather structure, but only lighter elements (phosphorus, sulfur) are comparable with a third specimen analyzed in this study. The bonding environment of copper is consistent with organic chelation and when combined with the presence of organic sulfur supports that remnant endogenous eumelanin pigments are preserved in the feathers of Archaeopteryx. We argue the uneven preservation of organic sulfur that correlates with copper is a result of the biocidal properties of chelated metals, as seen in extant feathers. Copper is a powerful taphonomic control reducing local breakdown of organic sulfur in the original keratin. This work also suggests that keratin has a higher preservation potential than collagen. The distribution of organometallic compounds can be used to predict the complete pigment pattern and show that the distal tips and outer vanes of feathers were more heavily pigmented than inner vanes. This pigment adaptation might have impacted upon the structural and mechanical properties of early feathers, steering plumage evolution in Archaeopteryx and other feathered theropods. JF - Abstracts with Programs - Geological Society of America AU - Manning, Phillip L AU - Wogelius, Roy A AU - Sellers, William I AU - Barden, Holly E AU - Edwards, Nicholas P AU - Larson, Peter L AU - Schwarz-Wings, Daniela AU - Egerton, Victoria M AU - Bergmann, Uwe AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 306 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 11:Vertebrate paleontology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1535206424?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Synchrotron-based+chemical+imaging+reveals+plumage+patterns+in+Archaeopteryx&rft.au=Manning%2C+Phillip+L%3BWogelius%2C+Roy+A%3BSellers%2C+William+I%3BBarden%2C+Holly+E%3BEdwards%2C+Nicholas+P%3BLarson%2C+Peter+L%3BSchwarz-Wings%2C+Daniela%3BEgerton%2C+Victoria+M%3BBergmann%2C+Uwe%3BAnonymous&rft.aulast=Manning&rft.aufirst=Phillip&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=306&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper224749.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-06-13 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Effects of sediment porosity and particulate organic carbon on Fe, S and U cycling in naturally reduced zones (NRZs) of a contaminated aquifer AN - 1492588812; 2014-007576 AB - Previous studies have illustrated the importance of Naturally Reduced Zones (NRZs) within saturated sediments as a source of reduced organic compounds and hydrogen, providing electron donor for subsurface microbial respiration. NRZ's are typically characterized by low permeability and elevated concentrations of organic carbon and trace metals. However, both the formation of NRZs and their importance to the overall aquifer carbon remineralization is not fully understood. Within NRZs the hydrolysis of particulate organic carbon (POC) and subsequent fermentation of dissolved organic carbon (DOC) to form low molecular weight dissolved organic carbon (LMW-DOC) provides electron donors necessary for the respiration of Fe, S, and in the case of the Rifle aquifer, U. Rates of POC hydrolysis and subsequent fermentation have been poorly constrained and rates in excess and deficit to the rates of subsurface anaerobic respiratory processes have been suggested. In this study, we simulate the development of NRZ sediments in diffusion-limited aggregates to investigate the physical and chemical conditions required for NRZ formation. Effects of sediment porosity and POC loading on Fe, S, and U cycling on molecular and nanoscale are investigated with synchrotron-based Near Edge X-ray Absorption Fine Structure Spectroscopy (NEXAFS. Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS) and Fourier Transform Infrared spectroscopy (FTIR) are used to characterize the transformations in POC and DOC. Sediment aggregates are inoculated with the natural microbial biota from the Rifle aquifer and population dynamics are monitored by 16S RNA analysis. Overall, establishment of low permeability NRZs within the aquifer stimulate microbial respiration beyond the diffusion-limited zones and can limit the transport of U through a contaminated aquifer. However, the long-term stability of NRZs and the colocated U is unknown and requires further study. JF - Mineralogical Magazine AU - Jones, M E AU - Janot, N AU - Bargar, J R AU - Fendorf, S AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 1406 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - respiration KW - mass spectra KW - hydrolysis KW - iron KW - infrared spectra KW - ground water KW - saturated zone KW - carbon KW - sediments KW - mineralization KW - spectra KW - reduction KW - particulate materials KW - organic carbon KW - water pollution KW - monitoring KW - solutes KW - pollution KW - rates KW - effects KW - porosity KW - biota KW - geochemical cycle KW - aquifers KW - nucleic acids KW - RNA KW - metals KW - EXAFS data KW - sulfur KW - Rifle Aquifer KW - uranium KW - trace metals KW - actinides KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492588812?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Effects+of+sediment+porosity+and+particulate+organic+carbon+on+Fe%2C+S+and+U+cycling+in+naturally+reduced+zones+%28NRZs%29+of+a+contaminated+aquifer&rft.au=Jones%2C+M+E%3BJanot%2C+N%3BBargar%2C+J+R%3BFendorf%2C+S%3BAnonymous&rft.aulast=Jones&rft.aufirst=M&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=1406&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.10 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-01-30 N1 - SubjectsTermNotLitGenreText - actinides; aquifers; biota; carbon; effects; EXAFS data; geochemical cycle; ground water; hydrolysis; infrared spectra; iron; mass spectra; metals; mineralization; monitoring; nucleic acids; organic carbon; particulate materials; pollution; porosity; rates; reduction; respiration; Rifle Aquifer; RNA; saturated zone; sediments; solutes; spectra; sulfur; trace metals; uranium; water pollution DO - http://dx.doi.org/10.1180/minmag.2013.077.5.10 ER - TY - JOUR T1 - Microbial extracellular polymeric substances modulate the product of uranium biomineralization AN - 1492585705; 2014-007413 AB - Microbial biomineralization influences the cycling and sequestration of a variety of metals and metalloids in the environment. Uranium biomineralization by Shewanella oneidensis MR-1 was shown to produce two distinct U(IV) products under different chemical conditions. Here, we report that the uranium product is modulated by the formation of extracellular polymeric substances (EPS), a biological response that improves cellular resistance to U toxicity. When imaged by cryo-electron microscopy and analyzed by X-ray absorption spectroscopy, the two uranium products have distinct morphologies and atomic environments. This difference is shown to be due to the presence or absence of EPS using a spectro-microscopy method -scanning transmission X-ray microscopy (STXM)- that can differentiate amongst carbon biomolecules and localize U. When EPS is present, U is largely associated with it instead of the cell surface. Furthermore, we show that when the suspected U reductases are removed by mutation, EPS production and cellular viability decrease. Hence, the structure of the product of uranium biomineralization is intricately linked to the formation of EPS. We posit that a single U(IV) product is favored in the subsurface due to the prevalence of biofilms and because EPS are major component of those structures. JF - Mineralogical Magazine AU - Bernier-Latmani, R AU - Shao, P P AU - Comolli, L R AU - Stylo, M AU - Alessi, D S AU - Bargar, J R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 693 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - biomineralization KW - extracellular polymeric compounds KW - metals KW - biofilms KW - uranium KW - geochemistry KW - actinides KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492585705?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Microbial+extracellular+polymeric+substances+modulate+the+product+of+uranium+biomineralization&rft.au=Bernier-Latmani%2C+R%3BShao%2C+P+P%3BComolli%2C+L+R%3BStylo%2C+M%3BAlessi%2C+D+S%3BBargar%2C+J+R%3BAnonymous&rft.aulast=Bernier-Latmani&rft.aufirst=R&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=693&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.2 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-05-15 N1 - CODEN - MNLMBB N1 - SubjectsTermNotLitGenreText - actinides; biofilms; biomineralization; extracellular polymeric compounds; geochemistry; metals; uranium DO - http://dx.doi.org/10.1180/minmag.2013.077.5.2 ER - TY - JOUR T1 - Speciation of uranium products formed during in situ biostimulation of the Old Rifle, CO aquifer AN - 1477829869; 2014-001994 AB - Uranium bioremediation strategies focus on the addition of a reduced carbon source to stimulate the growth of indigenous microbial communities in subsurface sediments. This growth leads to conditions that promote the reduction of soluble U(VI) species in groundwater to relatively insoluble and immobile U(IV) species. Field studies to date focus on U(IV) products formed in deep sulfate reducing conditions, which have been identified as uraninite (UO (sub 2+x) ), monomeric or mononuclear U(IV) species that lack crystal structure and are associated with biomass or iron-bearing minerals, and phosphate coordination polymers to which U(IV) is bound. However a systematic molecular-to-pore scale characterization of changes in U(IV) product speciation and stability as bioremediation proceeds is not extant. In this study, we deployed sediment reactors into a groundwater well at the Old Rifle, CO aquifer during biostimulation with acetate. Sediments were harvested as the aquifer progressed through metal- and sulfate-reducing regimes, and were characterized by spectroscopic, microscopic, wet chemical, and microbiological techniques. U(IV) product local structure and reactivity exhibits little apparent change despite large changes in redox state, accumulated uranium in the sediments, and microbial community structure. This result suggests that similar U(VI) reduction mechanisms may be operating throughout the biostimulation campaign. JF - Mineralogical Magazine AU - Alessi, D S AU - Janot, N AU - Lezama-Pacheco, J S AU - Suvorova, E I AU - Cerrato, J M AU - Giammar, D E AU - Fox, P M AU - Williams, K H AU - Long, P E AU - Handley, K M AU - Wrighton, K W AU - Miller, C S AU - Yang, L AU - Bernier-Latmani, R AU - Bargar, J R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 572 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - United States KW - in situ KW - Garfield County Colorado KW - pollutants KW - Old Rifle Colorado KW - pollution KW - bioremediation KW - remediation KW - ground water KW - aquifers KW - metals KW - uranium KW - Colorado KW - geochemistry KW - actinides KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1477829869?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Speciation+of+uranium+products+formed+during+in+situ+biostimulation+of+the+Old+Rifle%2C+CO+aquifer&rft.au=Alessi%2C+D+S%3BJanot%2C+N%3BLezama-Pacheco%2C+J+S%3BSuvorova%2C+E+I%3BCerrato%2C+J+M%3BGiammar%2C+D+E%3BFox%2C+P+M%3BWilliams%2C+K+H%3BLong%2C+P+E%3BHandley%2C+K+M%3BWrighton%2C+K+W%3BMiller%2C+C+S%3BYang%2C+L%3BBernier-Latmani%2C+R%3BBargar%2C+J+R%3BAnonymous&rft.aulast=Alessi&rft.aufirst=D&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=572&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.1 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-01-16 N1 - SubjectsTermNotLitGenreText - actinides; aquifers; bioremediation; Colorado; Garfield County Colorado; geochemistry; ground water; in situ; metals; Old Rifle Colorado; pollutants; pollution; remediation; United States; uranium DO - http://dx.doi.org/10.1180/minmag.2013.077.5.1 ER - TY - CPAPER T1 - Understanding Uranium Behavior in a Reduced Aquifer T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313120813; 6194986 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Janot, Noemie AU - Lezama-Pacheco, Juan AU - Williams, Kenneth AU - Bernier-Latmani, Rizlan AU - Long, Philip AU - Davis, James AU - Fox, Patricia AU - Yang, Li AU - Giammar, Daniel AU - Cerrato, Jose AU - Bargar, John Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Aquifers KW - Uranium KW - Aquifer UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313120813?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Canadian+Journal+of+Education&rft.atitle=Diversity+in+Public+Education%3A+Acknowledging+Immigrant+Parent+Knowledge&rft.au=Guo%2C+Yan&rft.aulast=Guo&rft.aufirst=Yan&rft.date=2012-04-01&rft.volume=35&rft.issue=2&rft.spage=120&rft.isbn=&rft.btitle=&rft.title=Canadian+Journal+of+Education&rft.issn=03802361&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Understanding uranium behavior in a reduced aquifer AN - 1637531397; 2014-101089 AB - Uranium contamination of groundwater is a concern at several US Department of Energy sites, such Old Rifle, CO. Uranium transport in the environment is mainly controlled by its oxidation state, since oxidized U(VI) is relatively mobile, whereas U(IV) is relatively insoluble. Bio-remediation of contaminated aquifers aims at immobilizing uranium in a reduced form. Previous laboratory and field studies have shown that adding electron donor (lactate, acetate, ethanol) to groundwater stimulates the activity of metal- and sulfate-reducing bacteria, which promotes U(VI) reduction in contaminated aquifers. However, obtaining information on chemical and physical forms of U, Fe and S species for sediments biostimulated in the field, as well as kinetic parameters such as U(VI) reduction rate, is challenging due to the low concentration of uranium in the aquifers (typically < 10 ppm) and the expense of collecting large number of cores. An in-situ technique has been developed for studying uranium, iron and sulfur reduction dynamics during such bioremediation episodes. This technique uses in-well columns to obtain direct access to chemical and physical forms of U(IV) produced in the aquifer, evolving microbial communities, and trace and major ion groundwater constituents. While several studies have explored bioreduction of uranium under sulfate-reducing conditions, less attention has been paid to the initial iron-reducing phase, noted as being of particular importance to uranium removal. The aim of this work was to assess the formation of U(IV) during the early stages of a bio-remediation experiment at the Old Rifle site, CO, from early iron-reducing conditions to the transition to sulfate-reducing conditions. Several in-well chromatographic columns packed with sediment were deployed and were sampled at different days after the start of bio-reduction. X-ray absorption spectroscopy and X-ray microscopy were used to obtain information on Fe, S and U speciation and distribution. Chemical extractions of the reduced sediments have also been performed, to determine the rate of Fe(II) and U(IV) accumulation. JF - American Geophysical Union Fall Meeting AU - Janot, N AU - Lezama-Pacheco, J S AU - Williams, K H AU - Bernier-Latmani, R AU - Long, P E AU - Davis, J A AU - Fox, P M AU - Yang, L AU - Giammar, D AU - Cerrato, J M AU - Bargar, J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H34C EP - 05 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 02B:Hydrochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637531397?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Understanding+uranium+behavior+in+a+reduced+aquifer&rft.au=Janot%2C+N%3BLezama-Pacheco%2C+J+S%3BWilliams%2C+K+H%3BBernier-Latmani%2C+R%3BLong%2C+P+E%3BDavis%2C+J+A%3BFox%2C+P+M%3BYang%2C+L%3BGiammar%2C+D%3BCerrato%2C+J+M%3BBargar%2C+J%3BAnonymous&rft.aulast=Janot&rft.aufirst=N&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Thicknesses of nanoscale brine films on mineral surfaces under geologic CO (sub 2) sequestration conditions measured with synchrotron X-ray fluorescence AN - 1629941235; 2014-098265 AB - Brine films remaining on mineral surfaces can influence flow, diffusion, and reactions between rock, brine, and CO2 phases in reservoirs used for geologic CO2 sequestration. We have investigated how the surface roughness and capillary potential Pc influences the thickness of a KCsI2 brine film on different minerals (silica and mica) under confinement with supercritical (sc) CO2. The thicknesses of brine films coating interior surfaces of mineral windows in a high-pressure cell were determined through synchrotron X-ray fluorescence of iodide ion at 7.8 MPa and 40 degrees C (representative of conditions at about 0.75 km below the land surface), with scCO2 as the immiscible confining fluid. The area-averaged film thicknesses on both silica and mica windows measured within a narrow Pc range from 0.18 to 3.7 kPa were found to be strongly controlled by surface roughness. The film thickness dependence on Pc was moderate (decreased 25% to 50%) on mica surfaces, and minor (decreased about 6% to 25%) on silica. We observed thicker brine films on mica, than on silica. The area-averaged film thicknesses on the 330 nm root mean square roughness (Rrms) silica surface ranged from 265 nm to 249 nm over the applied Pc range. The film thicknesses on the 146 nm Rrms mica surface ranged from 505 nm to 402 nm over the same range of Pc. The film thickness-Pc relation was obtained for the drainage and rewetting process on both minerals. Film thicknesses on the smoother mica surfaces were similar to DLVO-predicted values, while measurements on the smooth silica were only about 25% of the predicted thicknesses. The thickness-Pc relation of silica was nonhysteretic. But measurements on mica showed clear hysteresis, apparently indicative of changes in wettability during the drainage and rewetting process. Further experimental and computational studies on brine films wetting mineral surfaces over wider ranges of capillary pressures are needed in order to better understand film behavior under geologic CO2 sequestration conditions. JF - American Geophysical Union Fall Meeting AU - Kim, T AU - Tokunaga, T K AU - Shuman, D B AU - Sutton, S R AU - Newville, M AU - Lanzirotti, A AU - Bargar, J AU - Latimer, M AU - Webb, Sam AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H23D EP - 1385 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629941235?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Thicknesses+of+nanoscale+brine+films+on+mineral+surfaces+under+geologic+CO+%28sub+2%29+sequestration+conditions+measured+with+synchrotron+X-ray+fluorescence&rft.au=Kim%2C+T%3BTokunaga%2C+T+K%3BShuman%2C+D+B%3BSutton%2C+S+R%3BNewville%2C+M%3BLanzirotti%2C+A%3BBargar%2C+J%3BLatimer%2C+M%3BWebb%2C+Sam%3BAnonymous&rft.aulast=Kim&rft.aufirst=T&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/H/sessions/H23D/abstracts/H23D-1385.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Formation of iron melt channels in silicate perovskite at Earth's lower mantle conditions AN - 1623261376; 2014-090417 AB - Core-formation represents the most significant differentiation event in Earth's history. Earth's current layered structure with a metallic core and an overlying silicate mantle requires mechanism(s) to separate the iron alloy from the silicates in the initially accreted material. Many mechanisms have been proposed. At upper mantle conditions, percolation was ruled out as an efficient mechanism due to the tendency of liquid iron alloy to form isolated pockets at these pressures and temperatures. We investigated the ability of a liquid iron alloy to form an interconnected melt network with (Mg,Fe)SiO3 perovskite (pv) under Earth's lower mantle conditions using a laser-heated diamond-anvil cell (DAC). Using nanoscale synchrotron X-ray computed tomography, we imaged a dramatic change in the shape of the iron-rich melt in the three-dimensional (3D) reconstructions of samples prepared at varying pressures and temperatures. We found that the iron distribution went from isolated pockets to an interconnected network as the pressure increased. JF - American Geophysical Union Fall Meeting AU - Shi, Y AU - Liu, Y AU - Wang, J AU - Zhang, L AU - Yang, W AU - Mao, W L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract DI31B EP - 2404 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623261376?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Formation+of+iron+melt+channels+in+silicate+perovskite+at+Earth%27s+lower+mantle+conditions&rft.au=Shi%2C+Y%3BLiu%2C+Y%3BWang%2C+J%3BZhang%2C+L%3BYang%2C+W%3BMao%2C+W+L%3BAnonymous&rft.aulast=Shi&rft.aufirst=Y&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - CPAPER T1 - Production of Formaldehyde On Transition Metal Catalysts Via the Anhydrous Dehydrogenation of Methanol T2 - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AN - 1313044009; 6167490 JF - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AU - Lausche, Adam AU - Hummelshoj, Jens AU - Abild-Pedersen, Frank AU - Studt, Felix AU - Norskov, Jens Y1 - 2012/10/28/ PY - 2012 DA - 2012 Oct 28 KW - Catalysts KW - Transition metals KW - Formaldehyde KW - Dehydrogenation KW - Methanol UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313044009?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.atitle=Production+of+Formaldehyde+On+Transition+Metal+Catalysts+Via+the+Anhydrous+Dehydrogenation+of+Methanol&rft.au=Lausche%2C+Adam%3BHummelshoj%2C+Jens%3BAbild-Pedersen%2C+Frank%3BStudt%2C+Felix%3BNorskov%2C+Jens&rft.aulast=Lausche&rft.aufirst=Adam&rft.date=2012-10-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2012/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Self-Assembly of Clathrin Protein 3D Structures T2 - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AN - 1313022350; 6170429 JF - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AU - Arunagirinathan, Manickam AU - Gibbons, Brian AU - Schoen, Alia AU - Spakowitz, Andrew AU - Heilshorn, Sarah Y1 - 2012/10/28/ PY - 2012 DA - 2012 Oct 28 KW - Self-assembly KW - Clathrin UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313022350?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.atitle=Self-Assembly+of+Clathrin+Protein+3D+Structures&rft.au=Arunagirinathan%2C+Manickam%3BGibbons%2C+Brian%3BSchoen%2C+Alia%3BSpakowitz%2C+Andrew%3BHeilshorn%2C+Sarah&rft.aulast=Arunagirinathan&rft.aufirst=Manickam&rft.date=2012-10-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2012/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Properties of impurity-bearing ferrihydrite; I, Effects of Al content and precipitation rate on the structure of 2-line ferrihydrite AN - 1282820512; 2013-013418 AB - The association of Al with ferrihydrite (Fh) may have a considerable effect on the composition, structure, and surface properties of Fh nanoparticles, and thus impact its reactivity and interaction with pollutant species. Aluminous Fh is abundant in natural environments, but the mode of association of Al with this nanomineral is not yet fully understood. Al (super 3+) speciation may vary from true chemical substitution for Fe (super 3+) , to adsorption or surface precipitation, and/or to formation of a mixture of two (or more) individual nanoscale phases. The conditions of formation (i.e. slow vs. rapid precipitation) may also affect the nature of Fh nanoparticles in terms of their crystallinity, phase purity, and Al speciation. In this study we used a variety of laboratory (TEM, NMR, ICP-AES) and synchrotron-based techniques (X-ray total scattering and PDF analysis, scanning transmission X-ray microscopy, Al K-edge XANES spectroscopy) to characterize two synthetic Al-bearing Fh series formed at different precipitation rates in the presence of 5-40 mol% Al. We find that Al is dominantly octahedrally coordinated in the synthetic Fh samples and that up to 20-30 mol% Al substitutes for Fe in the Fh structure, regardless of the synthesis method we used. Formation of separate aluminous phases (e.g., gibbsite) was most significant at Al concentrations above 30 mol% Al in slowly precipitated samples. However, small amounts (<6% of total Al) of Al-hydroxide phases were also detected by NMR spectroscopy in samples with lower Al content (as low as 15 mol% Al), particularly in the Fh series that was precipitated slowly. Furthermore, it appears that the amount of Al incorporated in Fh is not affected by the synthesis methods we used and is more likely controlled by the accumulated strain caused by Al substitution in the Fh lattice. Given the prevalence of naturally occurring aluminous ferrihydrite, assumptions about ferrihydrite reactivity in natural environments should consider the impact of Al substitution on reduction potential, Fe bioavailability, as well as sorption reactions. Abstract Copyright (2012) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Cismasu, A Cristina AU - Michel, F Marc AU - Stebbins, Jonathan F AU - Levard, Clement AU - Brown, Gordon E, Jr Y1 - 2012/09/01/ PY - 2012 DA - 2012 Sep 01 SP - 275 EP - 291 PB - Elsevier, New York, NY VL - 92 SN - 0016-7037, 0016-7037 KW - sorption KW - lattice KW - mass spectra KW - crystal structure KW - bioavailability KW - NMR spectra KW - XANES spectra KW - reactivity KW - chemical reactions KW - aluminum KW - oxides KW - spectra KW - chemical composition KW - synthetic materials KW - pollutants KW - impurities KW - pollution KW - properties KW - adsorption KW - ferrihydrite KW - X-ray spectra KW - TEM data KW - MAS NMR spectra KW - molecular structure KW - ICP mass spectra KW - precipitation KW - metals KW - EXAFS data KW - crystal chemistry KW - nanoparticles KW - 01C:Mineralogy of non-silicates KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282820512?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Properties+of+impurity-bearing+ferrihydrite%3B+I%2C+Effects+of+Al+content+and+precipitation+rate+on+the+structure+of+2-line+ferrihydrite&rft.au=Cismasu%2C+A+Cristina%3BMichel%2C+F+Marc%3BStebbins%2C+Jonathan+F%3BLevard%2C+Clement%3BBrown%2C+Gordon+E%2C+Jr&rft.aulast=Cismasu&rft.aufirst=A&rft.date=2012-09-01&rft.volume=92&rft.issue=&rft.spage=275&rft.isbn=&rft.btitle=&rft.title=Language+Teaching&rft.issn=02614448&rft_id=info:doi/ L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 76 N1 - PubXState - NY N1 - Document feature - illus. incl. 5 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-02-05 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - adsorption; aluminum; bioavailability; chemical composition; chemical reactions; crystal chemistry; crystal structure; EXAFS data; ferrihydrite; ICP mass spectra; impurities; lattice; MAS NMR spectra; mass spectra; metals; molecular structure; nanoparticles; NMR spectra; oxides; pollutants; pollution; precipitation; properties; reactivity; sorption; spectra; synthetic materials; TEM data; X-ray spectra; XANES spectra DO - http://dx.doi.org/10.1016/j.gca.2012.06.010 ER - TY - JOUR T1 - REVIEW OF THE RADIOACTIVE MATERIAL EXPERIMENTS (RAM) AT STANFORD SYNCHROTRON RADIATION LIGHTSOURCE (SSRL) AT SLAC NATIONAL ACCELERATOR LABORATORY AN - 1032891918; 16966776 AB - During the 2010 calendar year approximately 68 radioactive experiments were performed at SSRL, compared with 2006 when only 16 radioactive experiments were performed. The four-fold increase in the number of radioactive experiments in the last four years has placed an increased demand on staff at SSRL and Radiation Protection Department (RP), necessitating a review of the process of supporting those experiments, and to identify gap analysis on RAM experiments. A gap analysis of the radioactive experiments in regards to radiological hazard analysis and controls at SSRL was performed. The review consisted of four main parts: (1) a review of the DOE and SLAC requirements in place in regards to air monitoring and ventilation controls (e.g., potential contamination, and exposure controls); and the maximum amounts of material allowed to run in a SSRL beamline, (2) a benchmark of SLAC hazards analysis and requirements against other light sources, specifically APS, ESRF, and NSLS in regards to the dose risk analysis under credible accidental exposure scenario and the maximum amounts of material authorized to run in the facilities, (3) recommendations on a dose-risk-based graded approach for the hazards control, and (4) a review of the RP Department and SSRL process and its effectiveness for implementing the controls described above. JF - Health Physics AU - Torres, M AD - SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - 1 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 103 IS - 2 SN - 0017-9078, 0017-9078 KW - Pollution Abstracts; Risk Abstracts KW - Pollution monitoring KW - Risk analysis KW - Laboratory testing KW - Ventilation KW - light sources KW - Reviews KW - Radioactive materials KW - Benchmarks KW - R2 23020:Technological risks KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1032891918?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=REVIEW+OF+THE+RADIOACTIVE+MATERIAL+EXPERIMENTS+%28RAM%29+AT+STANFORD+SYNCHROTRON+RADIATION+LIGHTSOURCE+%28SSRL%29+AT+SLAC+NATIONAL+ACCELERATOR+LABORATORY&rft.au=Torres%2C+M&rft.aulast=Torres&rft.aufirst=M&rft.date=2012-08-01&rft.volume=103&rft.issue=2&rft.spage=S47&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-08-01 N1 - Last updated - 2013-08-12 N1 - SubjectsTermNotLitGenreText - Pollution monitoring; Risk analysis; Ventilation; Laboratory testing; light sources; Reviews; Radioactive materials; Benchmarks ER - TY - JOUR T1 - An integrated high-throughput data acquisition system for biological solution X-ray scattering studies AN - 1022907837; 16612185 AB - A fully automated high-throughput solution X-ray scattering data collection system has been developed for protein structure studies at beamline 4-2 of the Stanford Synchrotron Radiation Lightsource. It is composed of a thin-wall quartz capillary cell, a syringe needle assembly on an XYZ positioning arm for sample delivery, a water-cooled sample rack and a computer-controlled fluid dispenser. It is controlled by a specifically developed software component built into the standard beamline control program Blu-Ice/DCS. The integrated system is intuitive and very simple to use, and enables experimenters to customize data collection strategy in a timely fashion in concert with an automated data processing program. The system also allows spectrophotometric determination of protein concentration for each sample aliquot in the beam via an in situ UV absorption spectrometer. A single set of solution scattering measurements requires a 20-30 mu l sample aliquot and takes typically 3.5min, including an extensive capillary cleaning cycle. Over 98.5% of measurements are valid and free from artefacts commonly caused by air-bubble contamination. The sample changer, which is compact and light, facilitates effortless switching with other sample-handling devices required for other types of non-crystalline X-ray scattering experiments. JF - Journal of Synchrotron Radiation AU - Martel, Anne AU - Liu, Ping AU - Weiss, Thomas M AU - Niebuhr, Marc AU - Tsuruta, Hiro AD - Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA Y1 - 2012/05/01/ PY - 2012 DA - 2012 May 01 SP - 431 EP - 434 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 19 IS - 3 SN - 0909-0495, 0909-0495 KW - Pollution Abstracts KW - Computer programs KW - Data collection KW - Data processing KW - Absorption KW - Proteins KW - Syringes KW - Ethnic groups KW - P 8000:RADIATION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1022907837?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Synchrotron+Radiation&rft.atitle=An+integrated+high-throughput+data+acquisition+system+for+biological+solution+X-ray+scattering+studies&rft.au=Martel%2C+Anne%3BLiu%2C+Ping%3BWeiss%2C+Thomas+M%3BNiebuhr%2C+Marc%3BTsuruta%2C+Hiro&rft.aulast=Martel&rft.aufirst=Anne&rft.date=2012-05-01&rft.volume=19&rft.issue=3&rft.spage=431&rft.isbn=&rft.btitle=&rft.title=Journal+of+Synchrotron+Radiation&rft.issn=09090495&rft_id=info:doi/10.1107%2FS0909049512008072 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-11-01 N1 - Document feature - figure 0 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Computer programs; Data collection; Data processing; Absorption; Syringes; Proteins; Ethnic groups DO - http://dx.doi.org/10.1107/S0909049512008072 ER - TY - JOUR T1 - American Mineralogist AN - 928890786; 2012-030324 AB - Hydromaghemite and ferrimagnetic ferrihydrite are two terms that designate the same phase, which exhibits strong ferrimagnetism and >3% water loss between 110 and 350 degrees C. Its X-ray diffraction patterns, both in the real and reciprocal space, are consistent with the structural model of ferrihydrite of Michel et al. (2010), which includes tetrahedrally coordinated iron. This phase can be readily produced via transformation of 2-line ferrihydrite in strictly aerobic conditions without the intermediate formation of magnetite, and where additives act, with different efficiency, as sorbents retarding the fast transformation, via aggregation, into hematite. JF - American Mineralogist AU - Barron, Vidal AU - Torrent, Jose AU - Michel, F Marc Y1 - 2012/01// PY - 2012 DA - January 2012 SP - 253 EP - 254 PB - Mineralogical Society of America, Washington, DC VL - 97 IS - 1 SN - 0003-004X, 0003-004X KW - models KW - akdalaite KW - hematite KW - oxides KW - ferrihydrite KW - hydromaghemite KW - order-disorder KW - 01C:Mineralogy of non-silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/928890786?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Mineralogist&rft.atitle=American+Mineralogist&rft.au=Barron%2C+Vidal%3BTorrent%2C+Jose%3BMichel%2C+F+Marc&rft.aulast=Barron&rft.aufirst=Vidal&rft.date=2012-01-01&rft.volume=97&rft.issue=1&rft.spage=253&rft.isbn=&rft.btitle=&rft.title=American+Mineralogist&rft.issn=0003004X&rft_id=info:doi/10.2138%2Fam.2012.3894 L2 - http://ammin.geoscienceworld.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 5 N1 - PubXState - DC N1 - SuppNotes - For reference to original see Manceau, A., American Mineralogist, Vol. 96, p. 521-533, 2011 N1 - Last updated - 2012-06-07 N1 - CODEN - AMMIAY N1 - SubjectsTermNotLitGenreText - akdalaite; ferrihydrite; hematite; hydromaghemite; models; order-disorder; oxides DO - http://dx.doi.org/10.2138/am.2012.3894 ER - TY - JOUR T1 - In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope AN - 1777108442; 16146808 AB - The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to survey the gamma-ray sky from 20 MeV to several hundreds of GeV. In this energy band there are no astronomical sources with sufficiently well known and sharp spectral features to allow an absolute calibration of the LAT energy scale. However, the geomagnetic cutoff in the cosmic ray electron-plus-positron (CRE) spectrum in low Earth orbit does provide such a spectral feature. The energy and spectral shape of this cutoff can be calculated with the aid of a numerical code tracing charged particles in the Earth's magnetic field. By comparing the cutoff value with that measured by the LAT in different geomagnetic positions, we have obtained several calibration points between ~6 and ~13 GeV with an estimated uncertainty of ~2%. An energy calibration with such high accuracy reduces the systematic uncertainty in LAT measurements of, for example, the spectral cutoff in the emission from gamma ray pulsars. JF - Astroparticle Physics AU - Ackermann, M AU - Ajello, M AU - Allafort, A AU - Atwood, W B AU - Axelsson, M AU - Baldini, L AU - Barbiellini, G AU - Bastieri, D AU - Bechtol, K AU - Bellazzini, R AU - Berenji, B AU - Bloom, ED AU - Bonamente, E AU - Borgland, A W AU - Bouvier, A AU - Bregeon, J AU - Brez, A AU - Brigida, M AU - Bruel, P AU - Buehler, R AU - Buson, S AU - Caliandro, G A AU - Cameron, R A AU - Caraveo, P A AU - Casandjian, J M AU - Cecchi, C AU - Charles, E AU - Chekhtman, A AU - Chiang, J AU - Ciprini, S AU - Claus, R AU - Cohen-Tanugi, J AU - Cutini, S AU - De Palma, F AU - Dermer, C D AU - Digel, S W AU - Silva, Edo Couto e AU - Drell, P S AU - Drlica-Wagner, A AU - Dubois, R AU - Enoto, T AU - Falletti, L AU - Favuzzi, C AU - Fegan, S J AU - Focke, W B AU - Fortin, P AU - Fukazawa, Y AU - Funk, S AU - Fusco, P AU - Gargano, F AU - Gehrels, N AU - Germani, S AU - Giglietto, N AU - Giordano, F AU - Giroletti, M AU - Glanzman, T AU - Godfrey, G AU - Grenier, IA AU - Grove, JE AU - Guiriec, S AU - Hadasch, D AU - Hayashida, M AU - Hays, E AU - Hughes, R E AU - Johannesson, G AU - Johnson, A S AU - Johnson, T J AU - Kamae, T AU - Katagiri, H AU - Kataoka, J AU - Knodlseder, J AU - Kuss, M AU - Lande, J AU - Latronico, L AU - Lee, S-H AU - Longo, F AU - Loparco, F AU - Lovellette, M N AU - Lubrano, P AU - Madejski, G M AU - Mazziotta, M N AU - McEnery, JE AU - Michelson, P F AU - Mizuno, T AU - Moiseev, A A AU - Monte, C AU - Monzani, ME AU - Morselli, A AU - Moskalenko, I V AU - Murgia, S AU - Nakamori, T AU - Naumann-Godo, M AU - Nolan, P L AU - Norris, J P AU - Nuss, E AU - Ohsugi, T AU - Okumura, A AU - Omodei, N AU - Orlando, E AU - Ormes, J F AU - Ozaki, M AU - Paneque, D AU - Panetta, J H AU - Parent, D AU - Pesce-Rollins, M AU - Pierbattista, M AU - Piron, F AU - Raino, S AU - Rando, R AU - Razzano, M AU - Reimer, A AU - Reimer, O AU - Reposeur, T AU - Ritz, S AU - Rochester, L S AU - Sgro, C AU - Siskind, E J AU - Smith, P D AU - Spandre, G AU - Spinelli, P AU - Suson, D J AU - Takahashi, H AU - Tanaka, T AU - Thayer, J G AU - Thayer, J B AU - Thompson, D J AU - Tibaldo, L AU - Tosti, G AU - Troja, E AU - Usher, T L AU - Vandenbroucke, J AU - Vasileiou, V AU - Vianello, G AU - Vilchez, N AU - Vitale, V AU - Waite AU - Wang, P AU - Winer, B L AU - Wood, K S AU - Yang, Z AU - Zimmer, S AD - W.W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA melissa.pesce.rollins@pi.infn.it Y1 - 2012/01// PY - 2012 DA - January 2012 SP - 346 EP - 353 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 35 IS - 6 SN - 0927-6505, 0927-6505 KW - Solid State and Superconductivity Abstracts (SO); Environmental Engineering Abstracts (EN); Aerospace & High Technology Database (AH) KW - Cosmic-rays KW - Geomagnetic cutoff KW - Absolute energy scale KW - Fermi Large Area Telescope KW - Uncertainty KW - Magnetic fields KW - Telescopes KW - Spectral emissivity KW - Geomagnetism KW - Calibration KW - Energy bands KW - Spectra UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1777108442?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astroparticle+Physics&rft.atitle=In-flight+measurement+of+the+absolute+energy+scale+of+the+Fermi+Large+Area+Telescope&rft.au=Ackermann%2C+M%3BAjello%2C+M%3BAllafort%2C+A%3BAtwood%2C+W+B%3BAxelsson%2C+M%3BBaldini%2C+L%3BBarbiellini%2C+G%3BBastieri%2C+D%3BBechtol%2C+K%3BBellazzini%2C+R%3BBerenji%2C+B%3BBloom%2C+ED%3BBonamente%2C+E%3BBorgland%2C+A+W%3BBouvier%2C+A%3BBregeon%2C+J%3BBrez%2C+A%3BBrigida%2C+M%3BBruel%2C+P%3BBuehler%2C+R%3BBuson%2C+S%3BCaliandro%2C+G+A%3BCameron%2C+R+A%3BCaraveo%2C+P+A%3BCasandjian%2C+J+M%3BCecchi%2C+C%3BCharles%2C+E%3BChekhtman%2C+A%3BChiang%2C+J%3BCiprini%2C+S%3BClaus%2C+R%3BCohen-Tanugi%2C+J%3BCutini%2C+S%3BDe+Palma%2C+F%3BDermer%2C+C+D%3BDigel%2C+S+W%3BSilva%2C+Edo+Couto+e%3BDrell%2C+P+S%3BDrlica-Wagner%2C+A%3BDubois%2C+R%3BEnoto%2C+T%3BFalletti%2C+L%3BFavuzzi%2C+C%3BFegan%2C+S+J%3BFocke%2C+W+B%3BFortin%2C+P%3BFukazawa%2C+Y%3BFunk%2C+S%3BFusco%2C+P%3BGargano%2C+F%3BGehrels%2C+N%3BGermani%2C+S%3BGiglietto%2C+N%3BGiordano%2C+F%3BGiroletti%2C+M%3BGlanzman%2C+T%3BGodfrey%2C+G%3BGrenier%2C+IA%3BGrove%2C+JE%3BGuiriec%2C+S%3BHadasch%2C+D%3BHayashida%2C+M%3BHays%2C+E%3BHughes%2C+R+E%3BJohannesson%2C+G%3BJohnson%2C+A+S%3BJohnson%2C+T+J%3BKamae%2C+T%3BKatagiri%2C+H%3BKataoka%2C+J%3BKnodlseder%2C+J%3BKuss%2C+M%3BLande%2C+J%3BLatronico%2C+L%3BLee%2C+S-H%3BLongo%2C+F%3BLoparco%2C+F%3BLovellette%2C+M+N%3BLubrano%2C+P%3BMadejski%2C+G+M%3BMazziotta%2C+M+N%3BMcEnery%2C+JE%3BMichelson%2C+P+F%3BMizuno%2C+T%3BMoiseev%2C+A+A%3BMonte%2C+C%3BMonzani%2C+ME%3BMorselli%2C+A%3BMoskalenko%2C+I+V%3BMurgia%2C+S%3BNakamori%2C+T%3BNaumann-Godo%2C+M%3BNolan%2C+P+L%3BNorris%2C+J+P%3BNuss%2C+E%3BOhsugi%2C+T%3BOkumura%2C+A%3BOmodei%2C+N%3BOrlando%2C+E%3BOrmes%2C+J+F%3BOzaki%2C+M%3BPaneque%2C+D%3BPanetta%2C+J+H%3BParent%2C+D%3BPesce-Rollins%2C+M%3BPierbattista%2C+M%3BPiron%2C+F%3BRaino%2C+S%3BRando%2C+R%3BRazzano%2C+M%3BReimer%2C+A%3BReimer%2C+O%3BReposeur%2C+T%3BRitz%2C+S%3BRochester%2C+L+S%3BSgro%2C+C%3BSiskind%2C+E+J%3BSmith%2C+P+D%3BSpandre%2C+G%3BSpinelli%2C+P%3BSuson%2C+D+J%3BTakahashi%2C+H%3BTanaka%2C+T%3BThayer%2C+J+G%3BThayer%2C+J+B%3BThompson%2C+D+J%3BTibaldo%2C+L%3BTosti%2C+G%3BTroja%2C+E%3BUsher%2C+T+L%3BVandenbroucke%2C+J%3BVasileiou%2C+V%3BVianello%2C+G%3BVilchez%2C+N%3BVitale%2C+V%3BWaite%3BWang%2C+P%3BWiner%2C+B+L%3BWood%2C+K+S%3BYang%2C+Z%3BZimmer%2C+S&rft.aulast=Ackermann&rft.aufirst=M&rft.date=2012-01-01&rft.volume=35&rft.issue=6&rft.spage=346&rft.isbn=&rft.btitle=&rft.title=Astroparticle+Physics&rft.issn=09276505&rft_id=info:doi/10.1016%2Fj.astropartphys.2011.10.007 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-05-01 N1 - Last updated - 2016-05-18 DO - http://dx.doi.org/10.1016/j.astropartphys.2011.10.007 ER - TY - JOUR T1 - Effects of common groundwater constituents on coupled Mn(II)/U(IV) oxidation by Bacillus sp. SG-1 AN - 1566815970; 2014-077592 AB - Bioreduction of U(VI) to U(IV) is considered a promising strategy for immobilizing U in the subsurface. Until recently, the product of U(VI) reduction was considered to be crystalline uraninite (UO (sub 2) ). Recent studies have shown that other non-UO (sub 2) phases may also exist including monomeric U(IV) which is presumed to be more labile relative to UO (sub 2) . Manganese oxides (MnO (sub 2) ) which can be formed microbially even under low oxygen concentrations, can oxidize U(IV) to U(VI), and thereby jeopardize the stability of U(IV). Once oxidized by biogenic MnO (sub 2) , the resulting U(VI) can sorb to the MnO (sub 2) surface. As the presence of MnO (sub 2) can greatly impact the fate and transport of U in the subsurface, it is imperative to understand the effect a variety of common groundwater constituents may have on microbial Mn(II)-oxidation rates and the structure of the biogenic manganese oxides which in turn potentially affect the stability of U(IV). In this study, the effects of common groundwater constituents, O (sub 2) (0-5 %), Ca (super 2+) (5 mM), Mg (super 2+) (5 mM), and HCO (sub 3) (super -) (1 mM), on the coupled Mn/U processes were investigated. A model Mn(II)-oxidizing microorganism, Bacillus sp. SG-1 spores, was incubated with Mn(II) in the presence and absence of the above solutes and U(IV) as either biogenic UO (sub 2) or monomeric U(IV). It is hypothesized that conditions that stimulate microbial Mn(II)-oxidation or lead to the formation of U(VI) complexes will lead to faster Mn(II) and U(IV) oxidation rates. In contrast, constituents that provide more stability for U(IV) species or sorb strongly to the MnO (sub 2) surface and reduce its ability to oxidize U(IV) will decrease or have little impact on the rate of U(IV) oxidation. As expected, increasing O (sub 2) concentration led to increased Mn(II)-oxidation rates. Addition of Ca (super 2+) stimulated Mn(II)-oxidation while Mg (super 2+) inhibited Mn(II)-oxidation in the presence of U(IV). Specific experiments probed the biological and chemical basis for the stimulatory and inhibitory effects of individual groundwater constituents on Mn(II)-oxidation in the presence of U(IV). JF - Mineralogical Magazine AU - Lee, Sung-Woo AU - Plathe, Kelly L AU - Wang, Zimeng AU - Lezama-Pacheco, Juan S AU - Bargar, John R AU - Giammar, Daniel E AU - Bernier-Latmani, Rizlan AU - Tebo, Bradley M AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 1993 PB - Mineralogical Society, London VL - 76 IS - 6 SN - 0026-461X, 0026-461X KW - oxidation KW - pollution KW - rates KW - bioremediation KW - manganese KW - remediation KW - ground water KW - transport KW - metals KW - bacteria KW - water pollution KW - Bacillus KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566815970?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Effects+of+common+groundwater+constituents+on+coupled+Mn%28II%29%2FU%28IV%29+oxidation+by+Bacillus+sp.+SG-1&rft.au=Lee%2C+Sung-Woo%3BPlathe%2C+Kelly+L%3BWang%2C+Zimeng%3BLezama-Pacheco%2C+Juan+S%3BBargar%2C+John+R%3BGiammar%2C+Daniel+E%3BBernier-Latmani%2C+Rizlan%3BTebo%2C+Bradley+M%3BAnonymous&rft.aulast=Lee&rft.aufirst=Sung-Woo&rft.date=2012-01-01&rft.volume=76&rft.issue=6&rft.spage=1993&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/76/6/1965.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2012 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Number of references - 2 N1 - Last updated - 2014-10-02 N1 - SubjectsTermNotLitGenreText - Bacillus; bacteria; bioremediation; ground water; manganese; metals; oxidation; pollution; rates; remediation; transport; water pollution ER - TY - JOUR T1 - Structure and surface reactivity of Al-, Si- and organic matter-rich naturally occurring ferrihydrite AN - 1542644877; 2014-047484 AB - Ferrihydrite is a poorly crystalline iron oxide nanomineral (2-7 nm) found in a variety of natural surface environments. Its occurrence is documented at near-neutral pH conditions in a variety of redox-active environments, such as soils and sediments, as well as freshwater and marine settings. As a result of its high surface area and its chemical reactivity, it is an important environmental sorbent, and plays an essential role in the geochemical cycling of pollutant (in)organic species. Under natural aqueous conditions, ferrihydrite precipitates in the presence of several inorganic species such as aluminum, silica, phosphate, etc., or in the presence of organic matter (OM). These impurities can affect the domain size, composition, and molecular-level structure of ferrihydrite, thus modifying fundamental properties that are directly correlated with solid-phase stability and surface reactivity. In this study we have characterized a series of ferrihydrite samples of variable Al, Si, and OM content by laboratory (TEM, chemical extractions, electrophoresis) and synchrotron-based techniques (high energy x-ray total scattering and pair distribution function analysis, scanning transmission x-ray microscopy) in order to place constraints on their short- and intermediate-range structure, their composition, their surface chemistry and association with organic matter. A significant decrease in crystallinity occurred with increasing impurity content. We attribute these changes primarily to the presence of strong binding ligands such as silica and organic matter, both of which are known to affect Fe polymerization and poison particle growth. It is expected that the presence of these ligands at the ferrihydrite surface will alter significantly its surface composition and reactivity in the environment. JF - Mineralogical Magazine AU - Cismasu, A C AU - Michel, F M AU - Tcaciuc, A P AU - Brown, G E, Jr AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 1579 PB - Mineralogical Society, London VL - 76 IS - 6 SN - 0026-461X, 0026-461X KW - chemical reactions KW - metals KW - aluminum KW - oxides KW - crystal structure KW - chemical composition KW - silicon KW - ferrihydrite KW - 01C:Mineralogy of non-silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542644877?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Structure+and+surface+reactivity+of+Al-%2C+Si-+and+organic+matter-rich+naturally+occurring+ferrihydrite&rft.au=Cismasu%2C+A+C%3BMichel%2C+F+M%3BTcaciuc%2C+A+P%3BBrown%2C+G+E%2C+Jr%3BAnonymous&rft.aulast=Cismasu&rft.aufirst=A&rft.date=2012-01-01&rft.volume=35&rft.issue=3&rft.spage=190&rft.isbn=&rft.btitle=&rft.title=Language+Teaching&rft.issn=02614448&rft_id=info:doi/ L2 - http://www.minersoc.org/files/Goldschmidt2012_Conference_Abstracts_C.pdf http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2012 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-07-04 N1 - CODEN - MNLMBB N1 - SubjectsTermNotLitGenreText - aluminum; chemical composition; chemical reactions; crystal structure; ferrihydrite; metals; oxides; silicon ER - TY - JOUR T1 - Speciation of uranium in biologically reduced sediments during iron and sulfate reduction in the Old Rifle Aquifer AN - 1855322139; 2017-002268 AB - The persistence and mobility of uranium in groundwater is intimately related to the different biogeochemical conditions found at contaminated sites. Understanding the different U(IV) species, their stability and transformation products in subsurface environments, particularly those found in naturally reduced and bioremediated sediments, is critical to developing field-scale models required to predict the long term fate of this hazardous element. Microbial reduction of U(VI) and subsequent formation uraninite, can occur over a period of several years, but little is known about the structure and stability of intermediate products of U(IV) that can form prior to uraninite generation. The study of these intermediate U(IV) species in naturally reduced systems is challenging because of the limited concentrations of uranium present in these sediments, which makes detailed spectroscopic and microscopic analysis difficult if not impossible. In this study we have developed an in-situ technique for studying U(IV) products of biological U(VI) reduction and their dynamics in aquifers over the scale of days to years. This technique uses in-well columns to obtain direct access to sediment U(IV) species, evolving microbial communities, and trace and major ion groundwater constituents. Whole sediments from these in-situ columns have been examined using x-ray and electron microscopy,and extended x-ray absorption fine structure (EXAFS) spectroscopy. EXAFS measurements revealed that U(IV) was primarily present as monomeric U(IV) species with first-shell coordination to oxygen atoms. Furthermore, different reduced U(IV) products were observed during sulfate and Fe reducing regimes, showing the strong dependence of the reduced product on biogeochemical conditions. This work establishes the importance of non-uraninite forms of U(IV) in subsurface sediments and provides a conceptual framework in which previously observed U(IV) reduction products can be related. JF - American Geophysical Union Fall Meeting AU - Lezama-Pacheco, J S AU - Bargar, J AU - Stubbs, J AU - Bernier-Latmani, Rizlan AU - Suvorova, E AU - Williams, K H AU - Davis, J A AU - Fox, P M AU - Giammar, D AU - Cerrato, J AU - Long, P AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract V22B EP - 07 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - water quality KW - Garfield County Colorado KW - remediation KW - ground water KW - Rifle Colorado KW - sediments KW - oxides KW - reduction KW - sulfate ion KW - in situ KW - sulfates KW - pollution KW - migration of elements KW - bioremediation KW - iron sulfates KW - Old Rifle Aquifer KW - metals KW - uranium KW - transformations KW - Colorado KW - uraninite KW - actinides KW - microorganisms KW - chemical fractionation KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1855322139?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Speciation+of+uranium+in+biologically+reduced+sediments+during+iron+and+sulfate+reduction+in+the+Old+Rifle+Aquifer&rft.au=Lezama-Pacheco%2C+J+S%3BBargar%2C+J%3BStubbs%2C+J%3BBernier-Latmani%2C+Rizlan%3BSuvorova%2C+E%3BWilliams%2C+K+H%3BDavis%2C+J+A%3BFox%2C+P+M%3BGiammar%2C+D%3BCerrato%2C+J%3BLong%2C+P%3BAnonymous&rft.aulast=Lezama-Pacheco&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2017-01-01 N1 - PubXState - DC N1 - Last updated - 2017-01-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - actinides; bioremediation; chemical fractionation; Colorado; Garfield County Colorado; ground water; in situ; iron sulfates; metals; microorganisms; migration of elements; Old Rifle Aquifer; oxides; pollution; reduction; remediation; Rifle Colorado; sediments; sulfate ion; sulfates; transformations; United States; uraninite; uranium; water quality ER - TY - JOUR T1 - Structural incorporation of uranium into iron oxides; a competitive secondary sequestration pathway mediated by Fe(II) AN - 1664438921; 2015-024839 AB - Uranium retention and sequestration pathways determine the long-term fate of this important contaminant in soils and sediments. Direct, enzymatic U reduction and subsequent precipitation of UO (sub 2) is one potential sequestration pathway, but indirect U transformations can also occur as a result of reactions with microbially-generated Fe(II). Here we explored uranium retention mechanisms active during abiotic reduction of U(VI) by aqueous Fe(II), in the presence of ferrihydrite, in Ca and carbonate-bearing solutions. Ferrihydrite transformation and U reduction were studied in batch incubations containing Ca (0 and 4 mM), carbonate (3.8 mM), ferrihydrite ( nearly equal 180 mg/L), Fe(II) (0.3 mM), and a range of concentrations of uranyl (1 to 170 mu M). Uranium retention pathways were differentiated using extended x-ray absorption fine structure (EXAFS) spectroscopy and synchrotron X-ray powder diffraction. At U concentrations >50 mu M, U(VI) reduction to U(IV) and subsequent precipitation of UO (sub 2) was a dominant sequestration pathway. At lower U concentrations (1-10 mu M), UO (sub 2) precipitation was not observed and incorporation into goethite, the secondary transformation product of ferrihydrite, was dominant. For groundwaters having micromolar U(VI) concentrations, U incorporation into ferrihydrite transformation products via microbially-produced Fe(II) may be an important sequestration process. JF - American Geophysical Union Fall Meeting AU - Massey, M S AU - Lezama-Pacheco, J S AU - Nico, P S AU - Bargar, J R AU - Fendorf, S E AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H24A EP - 04 PB - American Geophysical Union, Washington, DC VL - 2011 KW - water quality KW - X-ray diffraction data KW - enzymes KW - iron KW - remediation KW - ground water KW - major elements KW - sediments KW - retention KW - oxides KW - trace elements KW - soils KW - concentration KW - pollution KW - bioremediation KW - powder method KW - ferrihydrite KW - geochemical cycle KW - ferrous iron KW - organic compounds KW - metals KW - uranium KW - transformations KW - proteins KW - actinides KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664438921?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Structural+incorporation+of+uranium+into+iron+oxides%3B+a+competitive+secondary+sequestration+pathway+mediated+by+Fe%28II%29&rft.au=Massey%2C+M+S%3BLezama-Pacheco%2C+J+S%3BNico%2C+P+S%3BBargar%2C+J+R%3BFendorf%2C+S+E%3BAnonymous&rft.aulast=Massey&rft.aufirst=M&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H24A/abstracts/H24A-04.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - actinides; bioremediation; concentration; enzymes; ferrihydrite; ferrous iron; geochemical cycle; ground water; iron; major elements; metals; organic compounds; oxides; pollution; powder method; proteins; remediation; retention; sediments; soils; trace elements; transformations; uranium; water quality; X-ray diffraction data ER - TY - JOUR T1 - Synchrotron light reveals chemical ghosts of past life AN - 1011393978; 2012-045124 AB - Multidisciplinary approaches to the analyses of fossilized soft tissue have shown that endogenous organic compounds can survive through geologic time. The work presented here will show how coupling synchrotron-based X-ray and infra-red methods can serve to non-destructively resolve the survival of organic compounds derived from fossil and extant organisms, but also how spectroscopic details can assist in understanding the chemistry of exceptional preservation. Here we use Fourier Transform Infrared Spectroscopy (FTIR) to spatially resolve organic functional groups within Eocene ( approximately 50 mya) to Jurassic ( approximately 155 mya) aged fossils that show biological control on the distribution of amide and sulfur compounds. These compounds are most likely derived from the original biomaterials present in the structures analysed because other non-fossil derived organic matter from the same geological formations do not show intense amide or thiol absorption bands. Infrared maps and spectra from the fossils are directly comparable to extant samples. X-ray Absorption Spectroscopy (XAS) of sulfur in some fossil tissues shows it is present in several oxidation states, including organic sulfur compounds and inorganic sulfate minerals. By using this information to tune the incident X-ray beam energy to a value below the critical excitation energy for inorganic sulfur, we were able to use Synchrotron Rapid Scanning X-ray Fluorescence (SRS-XRF) to discreetly map organic sulfur in discrete biological structures. This approach resolves fossil-derived organic compounds with striking detail. In addition, in this and other fossil specimens, XAS analysis of trace metals correlated with soft tissue structures indicating that a significant and in some cases dominant portion of trace metal inventory is organically coordinated within tissue residues. Quantitative synchrotron-based XRF point analyses are presented to show that concentrations determined within fossils are comparable to those of extant organisms, that phylogenetically bracket fossil samples. A taphonomic model involving ternary complexation between fossil bio-derived organic molecules, divalent trace metals, and silicate surfaces are here presented to explain the survival of the observed compounds. JF - Abstracts with Programs - Geological Society of America AU - Manning, Phillip L AU - Wogelius, Roy A AU - Bergmann, Uwe AU - Anonymous Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 163 PB - Geological Society of America (GSA), Boulder, CO VL - 43 IS - 5 SN - 0016-7592, 0016-7592 KW - FTIR spectra KW - absorption KW - organic compounds KW - endogene processes KW - X-ray data KW - biochemistry KW - taphonomy KW - ecology KW - spectra KW - preservation KW - infrared spectra KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1011393978?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Synchrotron+light+reveals+chemical+ghosts+of+past+life&rft.au=Manning%2C+Phillip+L%3BWogelius%2C+Roy+A%3BBergmann%2C+Uwe%3BAnonymous&rft.aulast=Manning&rft.aufirst=Phillip&rft.date=2011-10-01&rft.volume=43&rft.issue=5&rft.spage=163&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - http://gsa.confex.com/gsa/2011AM/finalprogram/abstract_192295.htm LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - PubXState - CO N1 - Last updated - 2012-06-07 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - absorption; biochemistry; ecology; endogene processes; FTIR spectra; infrared spectra; organic compounds; preservation; spectra; taphonomy; X-ray data ER - TY - JOUR T1 - Trace metals as biomarkers for eumelanin pigment in the fossil record AN - 907922509; 2012-001589 AB - Well-preserved fossils of pivotal early bird and nonavian theropod species have provided unequivocal evidence for feathers and/or downlike integuments. Recent studies have reconstructed color on the basis of melanosome structure; however, the chemistry of these proposed melanosomes has remained unknown. We applied synchrotron x-ray techniques to several fossil and extant organisms, including Confuciusornis sanctus, in order to map and characterize possible chemical residues of melanin pigments. Results show that trace metals, such as copper, are present in fossils as organometallic compounds most likely derived from original eumelanin. The distribution of these compounds provides a long-lived biomarker of melanin presence and density within a range of fossilized organisms. Metal zoning patterns may be preserved long after melanosome structures have been destroyed. JF - Science AU - Wogelius, R A AU - Manning, P L AU - Barden, H E AU - Edwards, N P AU - Webb, S M AU - Sellers, W I AU - Taylor, K G AU - Larson, P L AU - Dodson, P AU - You, H AU - Da-qing, L AU - Bergmann, U Y1 - 2011/09// PY - 2011 DA - September 2011 SP - 1622 EP - 1626 PB - American Association for the Advancement of Science, Washington, DC VL - 333 IS - 6049 SN - 0036-8075, 0036-8075 KW - Diapsida KW - Far East KW - Confuciusornis santus KW - Cretaceous KW - copper KW - Xiagou Formation KW - geochemical indicators KW - XANES spectra KW - Gansus yumenensis KW - Archosauria KW - Theropoda KW - dinosaurs KW - spectra KW - Asia KW - geochemistry KW - China KW - Lower Cretaceous KW - Chordata KW - pigments KW - biochemistry KW - Jehol Group KW - biologic evolution KW - feathers KW - biomarkers KW - X-ray spectra KW - Mesozoic KW - Reptilia KW - Aves KW - metals KW - Saurischia KW - EXAFS data KW - trace metals KW - Vertebrata KW - Tetrapoda KW - melanosomes KW - 11:Vertebrate paleontology KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907922509?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Trace+metals+as+biomarkers+for+eumelanin+pigment+in+the+fossil+record&rft.au=Wogelius%2C+R+A%3BManning%2C+P+L%3BBarden%2C+H+E%3BEdwards%2C+N+P%3BWebb%2C+S+M%3BSellers%2C+W+I%3BTaylor%2C+K+G%3BLarson%2C+P+L%3BDodson%2C+P%3BYou%2C+H%3BDa-qing%2C+L%3BBergmann%2C+U&rft.aulast=Wogelius&rft.aufirst=R&rft.date=2011-09-01&rft.volume=333&rft.issue=6049&rft.spage=1622&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1205748 L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 25 N1 - PubXState - DC N1 - Document feature - illus. N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-06-07 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - Archosauria; Asia; Aves; biochemistry; biologic evolution; biomarkers; China; Chordata; Confuciusornis santus; copper; Cretaceous; Diapsida; dinosaurs; EXAFS data; Far East; feathers; Gansus yumenensis; geochemical indicators; geochemistry; Jehol Group; Lower Cretaceous; melanosomes; Mesozoic; metals; pigments; Reptilia; Saurischia; spectra; Tetrapoda; Theropoda; trace metals; Vertebrata; X-ray spectra; XANES spectra; Xiagou Formation DO - http://dx.doi.org/10.1126/science.1205748 ER - TY - JOUR T1 - Speciation and dynamics of biologically reduced U(IV) in the Old Rifle, CO, aquifer AN - 1037240158; 2012-077770 AB - The chemical and physical forms of U(IV), as well as the biogeochemical processes by which they form and transform, profoundly influence the behavior of uranium in reduced sediments. Obtaining this information for sediments biostimulated in situ, i.e., in the field, has been one of the most important and difficult scientific challenges in the field of uranium bioremediation. We have used in-well columns to obtain direct access to sediment U(IV) species, evolving microbial communities, and trace and major ion groundwater constituents in the Old Rifle, CO (USA) aquifer. Sediments were examined using x-ray and electron microscopy (XRM and SEM/TEM), x-ray absorption spectroscopy (XAS), and chemical digestions. EXAFS analysis showed that U(IV) occurred predominantly or exclusively as monomeric U(IV) complexes under both metal- and sulfate-reducing conditions, and was associated with biomass or Fe sulfides. Intriguingly, U(IV) was bonded to oxygen atoms, even when associated with iron sulfides. A fraction of these monomeric complexes transformed into uraninite in the aquifer over a subsequent 12 month period. This work establishes the importance of monomeric U(IV) complexes in subsurface sediments at the Old Rifle site and provides a conceptual framework in which previously observed U(IV) reduction products can be related. These experiments also establish that U(IV) species are dynamic in aquifers and can undergo non-oxidative transformation reactions. These new results have important implications for uranium reactive transport models and remediation technologies. JF - Mineralogical Magazine AU - Bargar, J R AU - Stubbs, J E AU - Suvorova, E I AU - Williams, K H AU - Campbell, K M AU - Lezama-Pacheco, J S AU - Cerrato, J M AU - Stylo, M A AU - Alessi, D S AU - Webb, S M AU - Bernier-Latmani, R AU - Giammar, D E AU - Davis, J A AU - Fox, P AU - Long, P E AU - Anonymous Y1 - 2011/06// PY - 2011 DA - June 2011 SP - 484 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - United States KW - Garfield County Colorado KW - complexing KW - remediation KW - ground water KW - Rifle Colorado KW - major elements KW - transport KW - sediments KW - reactive transport KW - oxides KW - reduction KW - trace elements KW - water pollution KW - geochemistry KW - tetravalent uranium KW - experimental studies KW - biochemistry KW - pollution KW - bioremediation KW - hydrochemistry KW - TEM data KW - Old Rifle Aquifer KW - aquifers KW - X-ray data KW - metals KW - EXAFS data KW - theoretical models KW - uranium KW - transformations KW - Colorado KW - uraninite KW - actinides KW - SEM data KW - microorganisms KW - chemical fractionation KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037240158?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Speciation+and+dynamics+of+biologically+reduced+U%28IV%29+in+the+Old+Rifle%2C+CO%2C+aquifer&rft.au=Bargar%2C+J+R%3BStubbs%2C+J+E%3BSuvorova%2C+E+I%3BWilliams%2C+K+H%3BCampbell%2C+K+M%3BLezama-Pacheco%2C+J+S%3BCerrato%2C+J+M%3BStylo%2C+M+A%3BAlessi%2C+D+S%3BWebb%2C+S+M%3BBernier-Latmani%2C+R%3BGiammar%2C+D+E%3BDavis%2C+J+A%3BFox%2C+P%3BLong%2C+P+E%3BAnonymous&rft.aulast=Bargar&rft.aufirst=J&rft.date=2011-06-01&rft.volume=75&rft.issue=3&rft.spage=484&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/465.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - actinides; aquifers; biochemistry; bioremediation; chemical fractionation; Colorado; complexing; EXAFS data; experimental studies; Garfield County Colorado; geochemistry; ground water; hydrochemistry; major elements; metals; microorganisms; Old Rifle Aquifer; oxides; pollution; reactive transport; reduction; remediation; Rifle Colorado; sediments; SEM data; TEM data; tetravalent uranium; theoretical models; trace elements; transformations; transport; United States; uraninite; uranium; water pollution; X-ray data ER - TY - JOUR T1 - Synchrotron rapid scanning X-ray fluorescence of soft-tissue fossils AN - 1011392757; 2012-042699 AB - Many geochemical and biological analytical techniques have been employed in the identification and quantification of soft-tissues in the fossil record. However, almost all of these techniques require destructive sampling and are unable to provide high resolution, large scale, spatially resolved chemical information from fossil material. Synchrotron rapid scanning x-ray fluorescence (SRS-XRF) developed at the Stanford Synchrotron Radiation Lightsource (SSRL), non-destructively provides highly sensitive, in situ and large scale 2D elemental maps at rapid scanning times ( approximately 30 secs/cm (super 2) ) and reveals the distribution of elements present in concentrations below the detection limits of many conventional geochemical techniques. Furthermore, we have uniquely combined x-ray absorption near edge spectroscopy with XRF rapid scanning, to produce maps showing only organic sulfur species. Our recent multi-technique study of fossilised reptile skin ( approximately 50 Mya), employing SRS-XRF, Fourier Transform Infrared (FTIR) spectroscopy and Pyrolysis-Gas Chromatography Mass Spectrometry, strongly suggests that remnants of the living organism's original chemistry (protein compounds) are preserved. Additionally, a new taphonomic model has been proposed to explain the survival of these compounds, involving ternary complexation between organic molecules, trace metals and silicate surfaces. JF - Mineralogical Magazine AU - Edwards, N P AU - Barden, H AU - Manning, P L AU - Sellers, W I AU - van Dongen, B E AU - Bergmann, U AU - Wogelius, R A AU - Anonymous Y1 - 2011/06// PY - 2011 DA - June 2011 SP - 798 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - experimental studies KW - Chordata KW - modern analogs KW - biochemistry KW - gas chromatograms KW - techniques KW - X-ray spectra KW - two-dimensional models KW - infrared spectra KW - XANES spectra KW - synchrotron radiation KW - Reptilia KW - FTIR spectra KW - soft parts KW - organic compounds KW - sampling KW - chromatograms KW - X-ray fluorescence spectra KW - taphonomy KW - trace metals KW - spectra KW - Vertebrata KW - Tetrapoda KW - 11:Vertebrate paleontology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1011392757?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Synchrotron+rapid+scanning+X-ray+fluorescence+of+soft-tissue+fossils&rft.au=Edwards%2C+N+P%3BBarden%2C+H%3BManning%2C+P+L%3BSellers%2C+W+I%3Bvan+Dongen%2C+B+E%3BBergmann%2C+U%3BWogelius%2C+R+A%3BAnonymous&rft.aulast=Edwards&rft.aufirst=N&rft.date=2011-06-01&rft.volume=75&rft.issue=3&rft.spage=798&rft.isbn=&rft.btitle=&rft.title=Language+Teaching&rft.issn=02614448&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/796.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - biochemistry; Chordata; chromatograms; experimental studies; FTIR spectra; gas chromatograms; infrared spectra; modern analogs; organic compounds; Reptilia; sampling; soft parts; spectra; synchrotron radiation; taphonomy; techniques; Tetrapoda; trace metals; two-dimensional models; Vertebrata; X-ray fluorescence spectra; X-ray spectra; XANES spectra ER - TY - JOUR T1 - In-situ dehydration studies of fully K-, Rb-, and Cs-exchanged natrolites AN - 855184623; 2011-026532 AB - In-situ synchrotron X-ray powder diffraction studies of K-, Rb-, and Cs-exchanged natrolites between room temperature and 425 degrees C revealed that the dehydrated phases with collapsed frameworks start to form at 175, 150, and 100 degrees C, respectively. The degree of the framework collapse indicated by the unit-cell volume contraction depends on the size of the non-framework cation: K-exchanged natrolite undergoes an 18.8% unit-cell volume contraction when dehydrated at 175 degrees C, whereas Rb- and Cs-exchanged natrolites show unit-cell volume contractions of 18.5 and 15.2% at 150 and 100 degrees C, respectively. In the hydrated phases, the dehydration-induced unit-cell volume reduction diminishes as the cation size increases and reveals increasingly a negative slope as smaller cations are substituted into the pores of the natrolite structure. The thermal expansion of the unit-cell volumes of the dehydrated K-, Rb-, and Cs-phases have positive thermal expansion coefficients of 8.80X10 (super -5) K (super -1) , 1.03X10 (super -4) K (super -1) , and 5.06X10 (super -5) K (super -1) , respectively. Rietveld structure refinements of the dehydrated phases at 400 degrees C reveal that the framework collapses are due to an increase of the chain rotation angles, psi , which narrow the channels to a more elliptical shape. Compared to their respective hydrated structures at ambient conditions, the dehydrated K-exchanged natrolite at 400 degrees C shows a 2.2-fold increase in psi , whereas the dehydrated Rb- and Cs-natrolites at 400 degrees C reveal increases of psi by ca. 3.7 and 7.3 times, respectively. The elliptical channel openings of the dehydrated K-, Rb-, to Cs-phases become larger as the cation size increases. The disordered non-framework cations in the hydrated K-, Rb-, and Cs-natrolite order during dehydration and the subsequent framework collapse. The dehydrated phases of Rb- and Cs-natrolite can be stabilized at ambient conditions. JF - American Mineralogist AU - Lee, Yongmoon AU - Seoung, Donghoon AU - Liu, Dan AU - Park, Min Bum AU - Hong, Suk Bong AU - Chen, Haiyan AU - Bai, Jianming AU - Kao, Chi-Chang AU - Vogt, Thomas AU - Lee, Yongjae Y1 - 2011/02// PY - 2011 DA - February 2011 SP - 393 EP - 401 PB - Mineralogical Society of America, Washington, DC VL - 96 IS - 2-3 SN - 0003-004X, 0003-004X KW - silicates KW - cell dimensions KW - experimental studies KW - in situ KW - X-ray diffraction data KW - rubidium KW - alkali metals KW - unit cell KW - crystal structure KW - Rietveld refinement KW - powder method KW - natrolite KW - synchrotron radiation KW - cesium KW - metals KW - potassium KW - zeolite group KW - framework silicates KW - dehydration KW - DTA data KW - crystal chemistry KW - TGA data KW - 01B:Mineralogy of silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/855184623?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Mineralogist&rft.atitle=In-situ+dehydration+studies+of+fully+K-%2C+Rb-%2C+and+Cs-exchanged+natrolites&rft.au=Lee%2C+Yongmoon%3BSeoung%2C+Donghoon%3BLiu%2C+Dan%3BPark%2C+Min+Bum%3BHong%2C+Suk+Bong%3BChen%2C+Haiyan%3BBai%2C+Jianming%3BKao%2C+Chi-Chang%3BVogt%2C+Thomas%3BLee%2C+Yongjae&rft.aulast=Lee&rft.aufirst=Yongmoon&rft.date=2011-02-01&rft.volume=96&rft.issue=2-3&rft.spage=393&rft.isbn=&rft.btitle=&rft.title=American+Mineralogist&rft.issn=0003004X&rft_id=info:doi/10.2138%2Fam.2011.3678 L2 - http://ammin.geoscienceworld.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2011-01-01 N1 - Number of references - 20 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2012-06-07 N1 - CODEN - AMMIAY N1 - SubjectsTermNotLitGenreText - alkali metals; cell dimensions; cesium; crystal chemistry; crystal structure; dehydration; DTA data; experimental studies; framework silicates; in situ; metals; natrolite; potassium; powder method; Rietveld refinement; rubidium; silicates; synchrotron radiation; TGA data; unit cell; X-ray diffraction data; zeolite group DO - http://dx.doi.org/10.2138/am.2011.3678 ER - TY - JOUR T1 - Structural incorporation of uranium during the Fe(II)-induced transformation of ferrihydrite AN - 1434005647; 2013-073069 AB - Fe-(oxyhydr)oxides, among the most important metal-scavenging phases in soils and sediments, can undergo structural and compositional transformations during iron reducing conditions. Understanding the geochemical cycling and interaction of iron oxides with Uranium and other redox-active radionuclides, is of prime importance in the development of state-of-the art biogeochemical models to understand the fate and transport of these hazardous elements. In this work, X-ray diffraction and EXAFS analysis have been used to characterize the transformation products and local atomic structure around uranium in synthetic iron-oxide phases obtained by the Fe (II)-induced transformation of ferrihydrite. After transformation of ferrihydrite, U (IV)-bearing compounds and Fe-oxides are observed, with U (V/VI) being structurally incorporated into multiple sites in the goethite structure. We will discuss the incorporation mechanism, in which adsorption of uranium on the ferrihydrite starting material plays a key role in incorporation of this radionuclide into the resulting crystalline iron oxide phases. Our work also suggests that bioremediation strategies such as biostimulation can drive U sequestration not only through direct reduction of U, but also through Fe redox cycling. JF - Mineralogical Magazine AU - Lezama Pacheco, Juan S AU - Massey, Michael S AU - Michel, F Marc AU - Bargar, John R AU - Fendorf, Scott AU - Anonymous Y1 - 2011 PY - 2011 DA - 2011 SP - 1306 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - soils KW - ferrihydrite KW - iron KW - ferric iron KW - chemical reactions KW - metals KW - sediments KW - oxides KW - uranium KW - reduction KW - chemical composition KW - geochemistry KW - actinides KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1434005647?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Structural+incorporation+of+uranium+during+the+Fe%28II%29-induced+transformation+of+ferrihydrite&rft.au=Lezama+Pacheco%2C+Juan+S%3BMassey%2C+Michael+S%3BMichel%2C+F+Marc%3BBargar%2C+John+R%3BFendorf%2C+Scott%3BAnonymous&rft.aulast=Lezama+Pacheco&rft.aufirst=Juan&rft.date=2011-01-01&rft.volume=75&rft.issue=3&rft.spage=1306&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/1261.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2013-01-01 N1 - Last updated - 2013-09-20 N1 - SubjectsTermNotLitGenreText - actinides; chemical composition; chemical reactions; ferric iron; ferrihydrite; geochemistry; iron; metals; oxides; reduction; sediments; soils; uranium ER - TY - JOUR T1 - Structures of three members of Pfam PF02663 (FmdE) implicated in microbial methanogenesis reveal a conserved a+b core domain and an auxiliary C-terminal treble-clef zinc finger AN - 954589015; 13885824 AB - Examination of the genomic context for members of the FmdE Pfam family (PF02663), such as the protein encoded by the fmdE gene from the methanogenic archaeon Methanobacterium thermoautotrophicum, indicates that 13 of them are co-transcribed with genes encoding subunits of molybdenum formylmethanofuran dehydrogenase (EC 1.2.99.5), an enzyme that is involved in microbial methane production. Here, the first crystal structures from PF02663 are described, representing two bacterial and one archaeal species: B8FYU2_DESHY from the anaerobic dehalogenating bacterium Desulfitobacterium hafniense DCB-2, Q2LQ23_SYNAS from the syntrophic bacterium Syntrophus aciditrophicus SB and Q9HJ63_THEAC from the thermoacidophilic archaeon Thermoplasma acidophilum. Two of these proteins, Q9HJ63_THEAC and Q2LQ23_SYNAS, contain two domains: an N-terminal thioredoxin-like a+b core domain (NTD) consisting of a five-stranded, mixed b-sheet flanked by several a-helices and a C-terminal zinc-finger domain (CTD). B8FYU2_DESHY, on the other hand, is composed solely of the NTD. The CTD of Q9HJ63_THEAC and Q2LQ23_SYNAS is best characterized as a treble-clef zinc finger. Two significant structural differences between Q9HJ63_THEAC and Q2LQ23_SYNAS involve their metal binding. First, zinc is bound to the putative active site on the NTD of Q9HJ63_THEAC, but is absent from the NTD of Q2LQ23_SYNAS. Second, whereas the structure of the CTD of Q2LQ23_SYNAS shows four Cys side chains within coordination distance of the Zn atom, the structure of Q9HJ63_THEAC is atypical for a treble-cleft zinc finger in that three Cys side chains and an Asp side chain are within coordination distance of the zinc. JF - Acta Crystallographica Section F AU - Axelrod, Herbert L AU - Das, Debanu AU - Abdubek, Polat AU - Astakhova, Tamara AU - Bakolitsa, Constantina AU - Carlton, Dennis AU - Chen, Connie AU - Chiu, Hsiu-Ju AU - Clayton, Thomas AU - Deller, Marc C AU - Duan, Lian AU - Ellrott, Kyle AU - Farr, Carol L AU - Feuerhelm, Julie AU - Grant, Joanna C AU - Grzechnik, Anna AU - Han, Gye Won AU - Jaroszewski, Lukasz AU - Jin, Kevin K AU - Klock, Heath E AU - Knuth, Mark W AU - Kozbial, Piotr AU - Krishna, SSri AU - Kumar, Abhinav AU - Lam, Winnie W AU - Marciano, David AU - McMullan, Daniel AU - Miller, Mitchell D AU - Morse, Andrew T AU - Nigoghossian, Edward AU - Nopakun, Amanda AU - Okach, Linda AU - Puckett, Christina AU - Reyes, Ron AU - Sefcovic, Natasha AU - Tien, Henry J AU - Trame, Christine B AU - van den Bedem, Henry AU - Weekes, Dana AU - Wooten, Tiffany AU - Xu, Qingping AU - Hodgson, Keith O AU - Wooley, John AU - Elsliger, Marc-Andre AU - Deacon, Ashley M AU - Godzik, Adam AU - Lesley, Scott A AU - Wilson, Ian A AD - aStanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, USA, wilson@scripps.edu Y1 - 2010/10/01/ PY - 2010 DA - 2010 Oct 01 SP - 1335 EP - 1346 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 USA VL - 66 IS - 10 SN - 1744-3091, 1744-3091 KW - Microbiology Abstracts A: Industrial & Applied Microbiology KW - Conserved sequence KW - Crystal structure KW - Enzymes KW - Formylmethanofuran dehydrogenase KW - Heavy metals KW - Methane KW - Methanogenesis KW - Molybdenum KW - Zinc KW - Zinc finger proteins KW - genomics KW - Thermoplasma acidophilum KW - Desulfitobacterium hafniense KW - Syntrophus aciditrophicus KW - Methanobacterium thermoautotrophicum KW - A 01320:Microbial Degradation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/954589015?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologya&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Acta+Crystallographica+Section+F&rft.atitle=Structures+of+three+members+of+Pfam+PF02663+%28FmdE%29+implicated+in+microbial+methanogenesis+reveal+a+conserved+a%2Bb+core+domain+and+an+auxiliary+C-terminal+treble-clef+zinc+finger&rft.au=Axelrod%2C+Herbert+L%3BDas%2C+Debanu%3BAbdubek%2C+Polat%3BAstakhova%2C+Tamara%3BBakolitsa%2C+Constantina%3BCarlton%2C+Dennis%3BChen%2C+Connie%3BChiu%2C+Hsiu-Ju%3BClayton%2C+Thomas%3BDeller%2C+Marc+C%3BDuan%2C+Lian%3BEllrott%2C+Kyle%3BFarr%2C+Carol+L%3BFeuerhelm%2C+Julie%3BGrant%2C+Joanna+C%3BGrzechnik%2C+Anna%3BHan%2C+Gye+Won%3BJaroszewski%2C+Lukasz%3BJin%2C+Kevin+K%3BKlock%2C+Heath+E%3BKnuth%2C+Mark+W%3BKozbial%2C+Piotr%3BKrishna%2C+SSri%3BKumar%2C+Abhinav%3BLam%2C+Winnie+W%3BMarciano%2C+David%3BMcMullan%2C+Daniel%3BMiller%2C+Mitchell+D%3BMorse%2C+Andrew+T%3BNigoghossian%2C+Edward%3BNopakun%2C+Amanda%3BOkach%2C+Linda%3BPuckett%2C+Christina%3BReyes%2C+Ron%3BSefcovic%2C+Natasha%3BTien%2C+Henry+J%3BTrame%2C+Christine+B%3Bvan+den+Bedem%2C+Henry%3BWeekes%2C+Dana%3BWooten%2C+Tiffany%3BXu%2C+Qingping%3BHodgson%2C+Keith+O%3BWooley%2C+John%3BElsliger%2C+Marc-Andre%3BDeacon%2C+Ashley+M%3BGodzik%2C+Adam%3BLesley%2C+Scott+A%3BWilson%2C+Ian+A&rft.aulast=Axelrod&rft.aufirst=Herbert&rft.date=2010-10-01&rft.volume=66&rft.issue=10&rft.spage=1335&rft.isbn=&rft.btitle=&rft.title=Acta+Crystallographica+Section+F&rft.issn=17443091&rft_id=info:doi/10.1107%2FS1744309110020166 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-03-01 N1 - Last updated - 2012-06-18 N1 - SubjectsTermNotLitGenreText - Methane; Heavy metals; Molybdenum; Zinc; Crystal structure; Conserved sequence; Enzymes; Formylmethanofuran dehydrogenase; Zinc finger proteins; genomics; Methanogenesis; Thermoplasma acidophilum; Syntrophus aciditrophicus; Desulfitobacterium hafniense; Methanobacterium thermoautotrophicum DO - http://dx.doi.org/10.1107/S1744309110020166 ER - TY - JOUR T1 - Structure of a membrane-attack complex/perforin (MACPF) family protein from the human gut symbiont Bacteroides thetaiotaomicron AN - 815540318; 13885814 AB - Membrane-attack complex/perforin (MACPF) proteins are transmembrane pore-forming proteins that are important in both human immunity and the virulence of pathogens. Bacterial MACPFs are found in diverse bacterial species, including most human gut-associated Bacteroides species. The crystal structure of a bacterial MACPF-domain-containing protein BT_3439 (Bth-MACPF) from B. thetaiotaomicron, a predominant member of the mammalian intestinal microbiota, has been determined. Bth-MACPF contains a membrane-attack complex/perforin (MACPF) domain and two novel C-terminal domains that resemble ribonuclease H and interleukin 8, respectively. The entire protein adopts a flat crescent shape, characteristic of other MACPF proteins, that may be important for oligomerization. This Bth-MACPF structure provides new features and insights not observed in two previous MACPF structures. Genomic context analysis infers that Bth-MACPF may be involved in a novel protein-transport or nutrient-uptake system, suggesting an important role for these MACPF proteins, which were likely to have been inherited from eukaryotes via horizontal gene transfer, in the adaptation of commensal bacteria to the host environment. JF - Acta Crystallographica Section F AU - Xu, Qingping AU - Abdubek, Polat AU - Astakhova, Tamara AU - Axelrod, Herbert L AU - Bakolitsa, Constantina AU - Cai, Xiaohui AU - Carlton, Dennis AU - Chen, Connie AU - Chiu, Hsiu-Ju AU - Clayton, Thomas AU - Das, Debanu AU - Deller, Marc C AU - Duan, Lian AU - Ellrott, Kyle AU - Farr, Carol L AU - Feuerhelm, Julie AU - Grant, Joanna C AU - Grzechnik, Anna AU - Han, Gye Won AU - Jaroszewski, Lukasz AU - Jin, Kevin K AU - Klock, Heath E AU - Knuth, Mark W AU - Kozbial, Piotr AU - Krishna, SSri AU - Kumar, Abhinav AU - Lam, Winnie W AU - Marciano, David AU - Miller, Mitchell D AU - Morse, Andrew T AU - Nigoghossian, Edward AU - Nopakun, Amanda AU - Okach, Linda AU - Puckett, Christina AU - Reyes, Ron AU - Tien, Henry J AU - Trame, Christine B AU - van den Bedem, Henry AU - Weekes, Dana AU - Wooten, Tiffany AU - Yeh, Andrew AU - Zhou, Jiadong AU - Hodgson, Keith O AU - Wooley, John AU - Elsliger, Marc-Andre AU - Deacon, Ashley M AU - Godzik, Adam AU - Lesley, Scott A AU - Wilson, Ian A AD - aStanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, USA, wilson@scripps.edu Y1 - 2010/10/01/ PY - 2010 DA - 2010 Oct 01 SP - 1297 EP - 1305 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 USA VL - 66 IS - 10 SN - 1744-3091, 1744-3091 KW - Microbiology Abstracts B: Bacteriology KW - Adaptations KW - Commensals KW - Crystal structure KW - Digestive tract KW - Gene transfer KW - Immunity KW - Interleukin 8 KW - Intestinal microflora KW - Oligomerization KW - Pathogens KW - Perforin KW - Ribonuclease H KW - Symbionts KW - Virulence KW - genomics KW - pore-forming proteins KW - Bacteroides thetaiotaomicron KW - J 02430:Symbiosis, Antibiosis & Phages UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/815540318?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Acta+Crystallographica+Section+F&rft.atitle=Structure+of+a+membrane-attack+complex%2Fperforin+%28MACPF%29+family+protein+from+the+human+gut+symbiont+Bacteroides+thetaiotaomicron&rft.au=Xu%2C+Qingping%3BAbdubek%2C+Polat%3BAstakhova%2C+Tamara%3BAxelrod%2C+Herbert+L%3BBakolitsa%2C+Constantina%3BCai%2C+Xiaohui%3BCarlton%2C+Dennis%3BChen%2C+Connie%3BChiu%2C+Hsiu-Ju%3BClayton%2C+Thomas%3BDas%2C+Debanu%3BDeller%2C+Marc+C%3BDuan%2C+Lian%3BEllrott%2C+Kyle%3BFarr%2C+Carol+L%3BFeuerhelm%2C+Julie%3BGrant%2C+Joanna+C%3BGrzechnik%2C+Anna%3BHan%2C+Gye+Won%3BJaroszewski%2C+Lukasz%3BJin%2C+Kevin+K%3BKlock%2C+Heath+E%3BKnuth%2C+Mark+W%3BKozbial%2C+Piotr%3BKrishna%2C+SSri%3BKumar%2C+Abhinav%3BLam%2C+Winnie+W%3BMarciano%2C+David%3BMiller%2C+Mitchell+D%3BMorse%2C+Andrew+T%3BNigoghossian%2C+Edward%3BNopakun%2C+Amanda%3BOkach%2C+Linda%3BPuckett%2C+Christina%3BReyes%2C+Ron%3BTien%2C+Henry+J%3BTrame%2C+Christine+B%3Bvan+den+Bedem%2C+Henry%3BWeekes%2C+Dana%3BWooten%2C+Tiffany%3BYeh%2C+Andrew%3BZhou%2C+Jiadong%3BHodgson%2C+Keith+O%3BWooley%2C+John%3BElsliger%2C+Marc-Andre%3BDeacon%2C+Ashley+M%3BGodzik%2C+Adam%3BLesley%2C+Scott+A%3BWilson%2C+Ian+A&rft.aulast=Xu&rft.aufirst=Qingping&rft.date=2010-10-01&rft.volume=66&rft.issue=10&rft.spage=1297&rft.isbn=&rft.btitle=&rft.title=Acta+Crystallographica+Section+F&rft.issn=17443091&rft_id=info:doi/10.1107%2FS1744309110023055 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-11-01 N1 - Last updated - 2012-06-18 N1 - SubjectsTermNotLitGenreText - Perforin; Adaptations; Symbionts; Oligomerization; Commensals; Pathogens; Immunity; pore-forming proteins; Interleukin 8; Virulence; Intestinal microflora; Digestive tract; Gene transfer; Ribonuclease H; Crystal structure; genomics; Bacteroides thetaiotaomicron DO - http://dx.doi.org/10.1107/S1744309110023055 ER - TY - JOUR T1 - The structure of Haemophilus influenzae prephenate dehydrogenase suggests unique features of bifunctional TyrA enzymes AN - 815538736; 13885815 AB - Chorismate mutase/prephenate dehydrogenase from Haemophilus influenzae Rd KW20 is a bifunctional enzyme that catalyzes the rearrangement of chorismate to prephenate and the NAD(P)+-dependent oxidative decarboxylation of prephenate to 4-hydroxyphenylpyruvate in tyrosine biosynthesis. The crystal structure of the prephenate dehydrogenase component (HinfPDH) of the TyrA protein from H. influenzae Rd KW20 in complex with the inhibitor tyrosine and cofactor NAD+ has been determined to 2.0 Aa resolution. HinfPDH is a dimeric enzyme, with each monomer consisting of an N-terminal a/b dinucleotide-binding domain and a C-terminal a-helical dimerization domain. The structure reveals key active-site residues at the domain interface, including His200, Arg297 and Ser179 that are involved in catalysis and/or ligand binding and are highly conserved in TyrA proteins from all three kingdoms of life. Tyrosine is bound directly at the catalytic site, suggesting that it is a competitive inhibitor of HinfPDH. Comparisons with its structural homologues reveal important differences around the active site, including the absence of an a-b motif in HinfPDH that is present in other TyrA proteins, such as Synechocystis sp. arogenate dehydrogenase. Residues from this motif are involved in discrimination between NADP+ and NAD+. The loop between b5 and b6 in the N-terminal domain is much shorter in HinfPDH and an extra helix is present at the C-terminus. Furthermore, HinfPDH adopts a more closed conformation compared with TyrA proteins that do not have tyrosine bound. This conformational change brings the substrate, cofactor and active-site residues into close proximity for catalysis. An ionic network consisting of Arg297 (a key residue for tyrosine binding), a water molecule, Asp206 (from the loop between b5 and b6) and Arg365' (from the additional C-terminal helix of the adjacent monomer) is observed that might be involved in gating the active site. JF - Acta Crystallographica Section F AU - Chiu, Hsiu-Ju AU - Abdubek, Polat AU - Astakhova, Tamara AU - Axelrod, Herbert L AU - Carlton, Dennis AU - Clayton, Thomas AU - Das, Debanu AU - Deller, Marc C AU - Duan, Lian AU - Feuerhelm, Julie AU - Grant, Joanna C AU - Grzechnik, Anna AU - Han, Gye Won AU - Jaroszewski, Lukasz AU - Jin, Kevin K AU - Klock, Heath E AU - Knuth, Mark W AU - Kozbial, Piotr AU - Krishna, SSri AU - Kumar, Abhinav AU - Marciano, David AU - McMullan, Daniel AU - Miller, Mitchell D AU - Morse, Andrew T AU - Nigoghossian, Edward AU - Okach, Linda AU - Reyes, Ron AU - Tien, Henry J AU - Trame, Christine B AU - van den Bedem, Henry AU - Weekes, Dana AU - Xu, Qingping AU - Hodgson, Keith O AU - Wooley, John AU - Elsliger, Marc-Andre AU - Deacon, Ashley M AU - Godzik, Adam AU - Lesley, Scott A AU - Wilson, Ian A AD - aStanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, USA, wilson@scripps.edu Y1 - 2010/10/01/ PY - 2010 DA - 2010 Oct 01 SP - 1317 EP - 1325 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 USA VL - 66 IS - 10 SN - 1744-3091, 1744-3091 KW - Microbiology Abstracts B: Bacteriology KW - Active sites KW - Bifunctional enzymes KW - C-Terminus KW - Catalysis KW - Chorismate mutase KW - Cofactors KW - Crystal structure KW - Decarboxylation KW - Enzymes KW - Gating KW - Monomers KW - Prephenate dehydrogenase KW - Tyrosine KW - dehydrogenase KW - Synechocystis KW - Haemophilus influenzae KW - J 02330:Biochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/815538736?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Acta+Crystallographica+Section+F&rft.atitle=The+structure+of+Haemophilus+influenzae+prephenate+dehydrogenase+suggests+unique+features+of+bifunctional+TyrA+enzymes&rft.au=Tran%2C+Ly&rft.aulast=Tran&rft.aufirst=Ly&rft.date=2007-05-01&rft.volume=6&rft.issue=1&rft.spage=151&rft.isbn=&rft.btitle=&rft.title=English+Teaching&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-11-01 N1 - Last updated - 2012-06-18 N1 - SubjectsTermNotLitGenreText - Prephenate dehydrogenase; C-Terminus; Tyrosine; Enzymes; Bifunctional enzymes; dehydrogenase; Monomers; Cofactors; Gating; Crystal structure; Chorismate mutase; Active sites; Decarboxylation; Catalysis; Synechocystis; Haemophilus influenzae DO - http://dx.doi.org/10.1107/S1744309110021688 ER - TY - JOUR T1 - Structure of the g-d-glutamyl-l-diamino acid endopeptidase YkfC from Bacillus cereus in complex with l-Ala-g-d-Glu: insights into substrate recognition by NlpC/P60 cysteine peptidases AN - 1776644705; 13885817 AB - Dipeptidyl-peptidase VI from Bacillus sphaericus and YkfC from Bacillus subtilis have both previously been characterized as highly specific g-d-glutamyl-l-diamino acid endopeptidases. The crystal structure of a YkfC ortholog from Bacillus cereus (BcYkfC) at 1.8 Aa resolution revealed that it contains two N-terminal bacterial SH3 (SH3b) domains in addition to the C-terminal catalytic NlpC/P60 domain that is ubiquitous in the very large family of cell-wall-related cysteine peptidases. A bound reaction product (l-Ala-g-d-Glu) enabled the identification of conserved sequence and structural signatures for recognition of l-Ala and g-d-Glu and, therefore, provides a clear framework for understanding the substrate specificity observed in dipeptidyl-peptidase VI, YkfC and other NlpC/P60 domains in general. The first SH3b domain plays an important role in defining substrate specificity by contributing to the formation of the active site, such that only murein peptides with a free N-terminal alanine are allowed. A conserved tyrosine in the SH3b domain of the YkfC subfamily is correlated with the presence of a conserved acidic residue in the NlpC/P60 domain and both residues interact with the free amine group of the alanine. This structural feature allows the definition of a subfamily of NlpC/P60 enzymes with the same N-terminal substrate requirements, including a previously characterized cyanobacterial l-alanine-g-d-glutamate endopeptidase that contains the two key components (an NlpC/P60 domain attached to an SH3b domain) for assembly of a YkfC-like active site. JF - Acta Crystallographica Section F AU - Xu, Qingping AU - Abdubek, Polat AU - Astakhova, Tamara AU - Axelrod, Herbert L AU - Bakolitsa, Constantina AU - Cai, Xiaohui AU - Carlton, Dennis AU - Chen, Connie AU - Chiu, Hsiu-Ju AU - Chiu, Michelle AU - Clayton, Thomas AU - Das, Debanu AU - Deller, Marc C AU - Duan, Lian AU - Ellrott, Kyle AU - Farr, Carol L AU - Feuerhelm, Julie AU - Grant, Joanna C AU - Grzechnik, Anna AU - Han, Gye Won AU - Jaroszewski, Lukasz AU - Jin, Kevin K AU - Klock, Heath E AU - Knuth, Mark W AU - Kozbial, Piotr AU - Krishna, SSri AU - Kumar, Abhinav AU - Lam, Winnie W AU - Marciano, David AU - Miller, Mitchell D AU - Morse, Andrew T AU - Nigoghossian, Edward AU - Nopakun, Amanda AU - Okach, Linda AU - Puckett, Christina AU - Reyes, Ron AU - Tien, Henry J AU - Trame, Christine B AU - van den Bedem, Henry AU - Weekes, Dana AU - Wooten, Tiffany AU - Yeh, Andrew AU - Hodgson, Keith O AU - Wooley, John AU - Elsliger, Marc-Andre AU - Deacon, Ashley M AU - Godzik, Adam AU - Lesley, Scott A AU - Wilson, Ian A AD - aStanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, USA, wilson@scripps.edu Y1 - 2010/10/01/ PY - 2010 DA - 2010 Oct 01 SP - 1354 EP - 1364 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 USA VL - 66 IS - 10 SN - 1744-3091, 1744-3091 KW - Microbiology Abstracts B: Bacteriology KW - g-d-glutamyl-l-diamino acid endopeptidase KW - cell-wall recycling KW - NlpC/P60 KW - SH3b KW - cysteine peptidases KW - enzyme specificity KW - Bacillus subtilis KW - Murein KW - Alanine KW - Bacillus cereus KW - Substrate specificity KW - Enzymes KW - Tyrosine KW - Bacillus sphaericus KW - amines KW - Cysteine KW - Crystal structure KW - Conserved sequence KW - endopeptidase KW - J 02330:Biochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1776644705?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Acta+Crystallographica+Section+F&rft.atitle=Structure+of+the+g-d-glutamyl-l-diamino+acid+endopeptidase+YkfC+from+Bacillus+cereus+in+complex+with+l-Ala-g-d-Glu%3A+insights+into+substrate+recognition+by+NlpC%2FP60+cysteine+peptidases&rft.au=Xu%2C+Qingping%3BAbdubek%2C+Polat%3BAstakhova%2C+Tamara%3BAxelrod%2C+Herbert+L%3BBakolitsa%2C+Constantina%3BCai%2C+Xiaohui%3BCarlton%2C+Dennis%3BChen%2C+Connie%3BChiu%2C+Hsiu-Ju%3BChiu%2C+Michelle%3BClayton%2C+Thomas%3BDas%2C+Debanu%3BDeller%2C+Marc+C%3BDuan%2C+Lian%3BEllrott%2C+Kyle%3BFarr%2C+Carol+L%3BFeuerhelm%2C+Julie%3BGrant%2C+Joanna+C%3BGrzechnik%2C+Anna%3BHan%2C+Gye+Won%3BJaroszewski%2C+Lukasz%3BJin%2C+Kevin+K%3BKlock%2C+Heath+E%3BKnuth%2C+Mark+W%3BKozbial%2C+Piotr%3BKrishna%2C+SSri%3BKumar%2C+Abhinav%3BLam%2C+Winnie+W%3BMarciano%2C+David%3BMiller%2C+Mitchell+D%3BMorse%2C+Andrew+T%3BNigoghossian%2C+Edward%3BNopakun%2C+Amanda%3BOkach%2C+Linda%3BPuckett%2C+Christina%3BReyes%2C+Ron%3BTien%2C+Henry+J%3BTrame%2C+Christine+B%3Bvan+den+Bedem%2C+Henry%3BWeekes%2C+Dana%3BWooten%2C+Tiffany%3BYeh%2C+Andrew%3BHodgson%2C+Keith+O%3BWooley%2C+John%3BElsliger%2C+Marc-Andre%3BDeacon%2C+Ashley+M%3BGodzik%2C+Adam%3BLesley%2C+Scott+A%3BWilson%2C+Ian+A&rft.aulast=SHIN&rft.aufirst=SARAH&rft.date=2002-09-01&rft.volume=23&rft.issue=3&rft.spage=337&rft.isbn=&rft.btitle=&rft.title=Applied+Psycholinguistics&rft.issn=01427164&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-03-01 N1 - Last updated - 2016-04-13 N1 - SubjectsTermNotLitGenreText - amines; Murein; Alanine; Cysteine; Crystal structure; Tyrosine; Conserved sequence; Enzymes; Substrate specificity; endopeptidase; Bacillus subtilis; Bacillus cereus; Bacillus sphaericus DO - http://dx.doi.org/10.1107/S1744309110021214 ER - TY - JOUR T1 - Insights on the cuprate high energy anomaly observed in ARPES AN - 754879993; 13401023 AB - Recently, angle-resolved photoemission spectroscopy has been used to highlight an anomalously large band renormalization at high binding energies in cuprate superconductors: the high energy "waterfall" or high energy anomaly (HEA). The anomaly is present for both hole- and electron-doped cuprates as well as the half-filled parent insulators with different energy scales arising on either side of the phase diagram. While photoemission matrix elements clearly play a role in changing the aesthetic appearance of the band dispersion, i.e. creating a "waterfall"-like appearance, they provide an inadequate description for the physics that underlies the strong band renormalization giving rise to the HEA. Model calculations of the single-band Hubbard Hamiltonian showcase the role played by correlations in the formation of the HEA and uncover significant differences in the HEA energy scale for hole- and electron-doped cuprates. In addition, this approach properly captures the transfer of spectral weight accompanying doping in a correlated material and provides a unifying description of the HEA across both sides of the cuprate phase diagram. We find that the anomaly demarcates a transition, or cross-over, from a quasiparticle band at low binding energies near the Fermi level to valence bands at higher binding energy, assumed to be of strong oxygen character. JF - Journal of Electron Spectroscopy and Related Phenomena AU - Moritz, B AU - Johnston, S AU - Devereaux, T P AD - Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA, moritzb@slac.stanford.edu Y1 - 2010/07// PY - 2010 DA - Jul 2010 SP - 31 EP - 34 PB - Elsevier Science, P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 181 IS - 1 SN - 0368-2048, 0368-2048 KW - Biotechnology and Bioengineering Abstracts KW - ARPES KW - Quantum Monte Carlo KW - Hubbard KW - Strong correlations KW - Oxygen KW - Thermodynamics KW - Energy KW - Spectroscopy KW - Models KW - W 30965:Miscellaneous, Reviews UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754879993?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Electron+Spectroscopy+and+Related+Phenomena&rft.atitle=Insights+on+the+cuprate+high+energy+anomaly+observed+in+ARPES&rft.au=Moritz%2C+B%3BJohnston%2C+S%3BDevereaux%2C+T+P&rft.aulast=Moritz&rft.aufirst=B&rft.date=2010-07-01&rft.volume=181&rft.issue=1&rft.spage=31&rft.isbn=&rft.btitle=&rft.title=Journal+of+Electron+Spectroscopy+and+Related+Phenomena&rft.issn=03682048&rft_id=info:doi/10.1016%2Fj.elspec.2010.06.001 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-09-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Oxygen; Thermodynamics; Energy; Spectroscopy; Models DO - http://dx.doi.org/10.1016/j.elspec.2010.06.001 ER - TY - JOUR T1 - Nanoscale X-Ray Microscopic Imaging of Mammalian Mineralized Tissue AN - 746227734; 12928619 AB - A novel hard transmission X-ray microscope (TXM) at the Stanford Synchrotron Radiation Lightsource operating from 5 to 15 keV X-ray energy with 14 to 30 km2 field of view has been used for high-resolution (30-40 nm) imaging and density quantification of mineralized tissue. TXM is uniquely suited for imaging of internal cellular structures and networks in mammalian mineralized tissues using relatively thick (50 km), untreated samples that preserve tissue micro- and nanostructure. To test this method we performed Zernike phase contrast and absorption contrast imaging of mouse cancellous bone prepared under different conditions of in vivo loading, fixation, and contrast agents. In addition, the three-dimensional structure was examined using tomography. Individual osteocytic lacunae were observed embedded within trabeculae in cancellous bone. Extensive canalicular networks were evident and included processes with diameters near the 30-40 nm instrument resolution that have not been reported previously. Trabecular density was quantified relative to rod-like crystalline apatite, and rod-like trabecular struts were found to have 51-54% of pure crystal density and plate-like areas had 44-53% of crystal density. The nanometer resolution of TXM enables future studies for visualization and quantification of ultrastructural changes in bone tissue resulting from osteoporosis, dental disease, and other pathologies. JF - Microscopy and Microanalysis AU - Andrews, Joy C AU - Almeida, Eduardo AU - van der Meulen, Marjolein CH AU - Alwood, Joshua S AU - Lee, Chialing AU - Liu, Yijin AU - Chen, Jie AU - Meirer, Florian AU - Feser, Michael AU - Gelb, Jeff AU - Rudati, Juana AU - Tkachuk, Andrei AU - Yun, Wenbing AU - Pianetta, Piero AD - Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA, jandrews@slac.stanford.edu jandrews@slac.stanford.edu jandrews@slac.stanford.edu jandrews@slac.stanford.edu jandrews@slac.stanford.edu Y1 - 2010/06// PY - 2010 DA - Jun 2010 SP - 327 EP - 336 PB - Cambridge University Press, The Edinburgh Building, Cambridge CB2 2RU UK VL - 16 IS - 3 SN - 1431-9276, 1431-9276 KW - Biotechnology and Bioengineering Abstracts; Calcium & Calcified Tissue Abstracts KW - apatite KW - Bone (cancellous) KW - Loading KW - Microscopes KW - Osteoporosis KW - Crystals KW - imaging KW - Bone imaging KW - Energy KW - Ionizing radiation KW - Contrast media KW - Tomography KW - Dental disorders KW - W 30910:Imaging KW - T 2025:Bone and Bone Diseases UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/746227734?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Microscopy+and+Microanalysis&rft.atitle=Nanoscale+X-Ray+Microscopic+Imaging+of+Mammalian+Mineralized+Tissue&rft.au=Andrews%2C+Joy+C%3BAlmeida%2C+Eduardo%3Bvan+der+Meulen%2C+Marjolein+CH%3BAlwood%2C+Joshua+S%3BLee%2C+Chialing%3BLiu%2C+Yijin%3BChen%2C+Jie%3BMeirer%2C+Florian%3BFeser%2C+Michael%3BGelb%2C+Jeff%3BRudati%2C+Juana%3BTkachuk%2C+Andrei%3BYun%2C+Wenbing%3BPianetta%2C+Piero&rft.aulast=Andrews&rft.aufirst=Joy&rft.date=2010-06-01&rft.volume=16&rft.issue=3&rft.spage=327&rft.isbn=&rft.btitle=&rft.title=Microscopy+and+Microanalysis&rft.issn=14319276&rft_id=info:doi/10.1017%2FS1431927610000231 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-06-01 N1 - Number of references - 47 N1 - Last updated - 2015-03-31 N1 - SubjectsTermNotLitGenreText - apatite; Bone (cancellous); Loading; Microscopes; Osteoporosis; Crystals; imaging; Bone imaging; Ionizing radiation; Energy; Contrast media; Tomography; Dental disorders DO - http://dx.doi.org/10.1017/S1431927610000231 ER - TY - CPAPER T1 - Hybrid Mosfet/Driver Switching Module for Ilc Damping Ring Kicker Modulators T2 - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AN - 754254213; 5787464 JF - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AU - Tang, Tao AU - Burkhart, Craig Y1 - 2010/05/23/ PY - 2010 DA - 2010 May 23 KW - Hybrids KW - Damping KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754254213?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.atitle=Hybrid+Mosfet%2FDriver+Switching+Module+for+Ilc+Damping+Ring+Kicker+Modulators&rft.au=Tang%2C+Tao%3BBurkhart%2C+Craig&rft.aulast=Tang&rft.aufirst=Tao&rft.date=2010-05-23&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.issn=&rft_id=info:doi/ L2 - http://www.eng.auburn.edu/pmhvc2010/images/2010_IPMHVC_Tech_Prog.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-08-02 N1 - Last updated - 2010-09-25 ER - TY - CPAPER T1 - P1-Marx Modulator for the ILC T2 - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AN - 754231881; 5787432 JF - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AU - Burkhart, Craig AU - Beukers, Tony AU - Kemp, Mark AU - Larsen, Ray AU - Nguyen, Minh AU - Olsen, Jeff AU - Tang, Tao Y1 - 2010/05/23/ PY - 2010 DA - 2010 May 23 KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754231881?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.atitle=P1-Marx+Modulator+for+the+ILC&rft.au=Burkhart%2C+Craig%3BBeukers%2C+Tony%3BKemp%2C+Mark%3BLarsen%2C+Ray%3BNguyen%2C+Minh%3BOlsen%2C+Jeff%3BTang%2C+Tao&rft.aulast=Burkhart&rft.aufirst=Craig&rft.date=2010-05-23&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.issn=&rft_id=info:doi/ L2 - http://www.eng.auburn.edu/pmhvc2010/images/2010_IPMHVC_Tech_Prog.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-08-02 N1 - Last updated - 2010-09-25 ER - TY - CPAPER T1 - A Prognostic Method for Scheduling Maintenance on the p2-Marx Modulator T2 - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AN - 754231441; 5787577 JF - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AU - Benwell, Andrew AU - Burkhart, Craig AU - Kemp, Mark AU - Macken, Koen AU - Nguyen, Minh AU - MacNair, Dave AU - Olsen, Jeff AU - Larson, Ray Y1 - 2010/05/23/ PY - 2010 DA - 2010 May 23 KW - Maintenance KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754231441?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.atitle=A+Prognostic+Method+for+Scheduling+Maintenance+on+the+p2-Marx+Modulator&rft.au=Benwell%2C+Andrew%3BBurkhart%2C+Craig%3BKemp%2C+Mark%3BMacken%2C+Koen%3BNguyen%2C+Minh%3BMacNair%2C+Dave%3BOlsen%2C+Jeff%3BLarson%2C+Ray&rft.aulast=Benwell&rft.aufirst=Andrew&rft.date=2010-05-23&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.issn=&rft_id=info:doi/ L2 - http://www.eng.auburn.edu/pmhvc2010/images/2010_IPMHVC_Tech_Prog.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-08-02 N1 - Last updated - 2010-09-25 ER - TY - CPAPER T1 - Verfication of an Igbt Fusing Switch for over-Current Protection of the Sns Hvcm T2 - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AN - 754224649; 5787576 JF - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AU - Benwell, Andrew AU - Kemp, Mark AU - Burkhart, Craig AU - Nguyen, Minh AU - Anderson, David Y1 - 2010/05/23/ PY - 2010 DA - 2010 May 23 KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754224649?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.atitle=Verfication+of+an+Igbt+Fusing+Switch+for+over-Current+Protection+of+the+Sns+Hvcm&rft.au=Benwell%2C+Andrew%3BKemp%2C+Mark%3BBurkhart%2C+Craig%3BNguyen%2C+Minh%3BAnderson%2C+David&rft.aulast=Benwell&rft.aufirst=Andrew&rft.date=2010-05-23&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.issn=&rft_id=info:doi/ L2 - http://www.eng.auburn.edu/pmhvc2010/images/2010_IPMHVC_Tech_Prog.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-08-02 N1 - Last updated - 2010-09-25 ER - TY - CPAPER T1 - Status Update on the Second-Generation ILC Marx Modulator Prototype T2 - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AN - 754213423; 5787433 JF - 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010) AU - Kemp, Mark AU - Benwell, Andrew AU - Burkhart, Craig AU - Larsen, Ray AU - Macken, Koen AU - MacNair, Dave AU - Nguyen, Minh AU - Olsen, Jeff Y1 - 2010/05/23/ PY - 2010 DA - 2010 May 23 KW - Prototypes KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754213423?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.atitle=Status+Update+on+the+Second-Generation+ILC+Marx+Modulator+Prototype&rft.au=Kemp%2C+Mark%3BBenwell%2C+Andrew%3BBurkhart%2C+Craig%3BLarsen%2C+Ray%3BMacken%2C+Koen%3BMacNair%2C+Dave%3BNguyen%2C+Minh%3BOlsen%2C+Jeff&rft.aulast=Kemp&rft.aufirst=Mark&rft.date=2010-05-23&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2010+IEEE+International+Power+Modulator+and+High+Voltage+Conference+%28IPMHVC+2010%29&rft.issn=&rft_id=info:doi/ L2 - http://www.eng.auburn.edu/pmhvc2010/images/2010_IPMHVC_Tech_Prog.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-08-02 N1 - Last updated - 2010-09-25 ER - TY - CPAPER T1 - On the Nature of Pt-O Species Observed with XANES and Implications for the Oxygen Reduction Reaction T2 - 217th Meeting of the Electrochemical Society AN - 754235298; 5784253 JF - 217th Meeting of the Electrochemical Society AU - Friebel, D AU - Anniyev, T AU - Miller, D AU - O'Grady, C AU - Ogasawara, H AU - Bergmann, U AU - Bargar, J AU - Nilsson, A AU - Wikfeldt, K AU - Pettersson, L Y1 - 2010/04/25/ PY - 2010 DA - 2010 Apr 25 KW - Oxygen KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754235298?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=217th+Meeting+of+the+Electrochemical+Society&rft.atitle=On+the+Nature+of+Pt-O+Species+Observed+with+XANES+and+Implications+for+the+Oxygen+Reduction+Reaction&rft.au=Friebel%2C+D%3BAnniyev%2C+T%3BMiller%2C+D%3BO%27Grady%2C+C%3BOgasawara%2C+H%3BBergmann%2C+U%3BBargar%2C+J%3BNilsson%2C+A%3BWikfeldt%2C+K%3BPettersson%2C+L&rft.aulast=Friebel&rft.aufirst=D&rft.date=2010-04-25&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=217th+Meeting+of+the+Electrochemical+Society&rft.issn=&rft_id=info:doi/ L2 - http://www.electrochem.org/meetings/biannual/217/assets/217_meeting_pr LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-08-02 N1 - Last updated - 2010-09-25 ER - TY - CPAPER T1 - Kinetics of Oxygen Dissociation on Pt(111) T2 - 217th Meeting of the Electrochemical Society AN - 754217060; 5784251 JF - 217th Meeting of the Electrochemical Society AU - Naslund, L AU - Ogasawara, H AU - Miller, D J AU - Oberg, H AU - Viswanathan, V AU - Anniyev, T AU - Pitsch, H AU - Pettersson, L AU - Nilsson, A Y1 - 2010/04/25/ PY - 2010 DA - 2010 Apr 25 KW - Oxygen KW - Kinetics KW - Dissociation KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754217060?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=217th+Meeting+of+the+Electrochemical+Society&rft.atitle=Kinetics+of+Oxygen+Dissociation+on+Pt%28111%29&rft.au=Naslund%2C+L%3BOgasawara%2C+H%3BMiller%2C+D+J%3BOberg%2C+H%3BViswanathan%2C+V%3BAnniyev%2C+T%3BPitsch%2C+H%3BPettersson%2C+L%3BNilsson%2C+A&rft.aulast=Naslund&rft.aufirst=L&rft.date=2010-04-25&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=217th+Meeting+of+the+Electrochemical+Society&rft.issn=&rft_id=info:doi/ L2 - http://www.electrochem.org/meetings/biannual/217/assets/217_meeting_pr LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-08-02 N1 - Last updated - 2010-09-25 ER - TY - JOUR T1 - Crystal structure of the first eubacterial Mre11 nuclease reveals novel features that may discriminate substrates during DNA repair. AN - 733792733; 20122942 AB - Mre11 nuclease plays a central role in the repair of cytotoxic and mutagenic DNA double-strand breaks. As X-ray structural information has been available only for the Pyrococcus furiosus enzyme (PfMre11), the conserved and variable features of this nuclease across the domains of life have not been experimentally defined. Our crystal structure and biochemical studies demonstrate that TM1635 from Thermotoga maritima, originally annotated as a putative nuclease, is an Mre11 endo/exonuclease (TmMre11) and the first such structure from eubacteria. TmMre11 and PfMre11 display similar overall structures, despite sequence identity in the twilight zone of only approximately 20%. However, they differ substantially in their DNA-specificity domains and in their dimeric organization. Residues in the nuclease domain are highly conserved, but those in the DNA-specificity domain are not. The structural differences likely affect how Mre11 from different organisms recognize and interact with single-stranded DNA, double-stranded DNA and DNA hairpin structures during DNA repair. The TmMre11 nuclease active site has no bound metal ions, but is conserved in sequence and structure with the exception of a histidine that is important in PfMre11 nuclease activity. Nevertheless, biochemical characterization confirms that TmMre11 possesses both endonuclease and exonuclease activities on single-stranded and double-stranded DNA substrates, respectively. JF - Journal of molecular biology AU - Das, Debanu AU - Moiani, Davide AU - Axelrod, Herbert L AU - Miller, Mitchell D AU - McMullan, Daniel AU - Jin, Kevin K AU - Abdubek, Polat AU - Astakhova, Tamara AU - Burra, Prasad AU - Carlton, Dennis AU - Chiu, Hsiu-Ju AU - Clayton, Thomas AU - Deller, Marc C AU - Duan, Lian AU - Ernst, Dustin AU - Feuerhelm, Julie AU - Grant, Joanna C AU - Grzechnik, Anna AU - Grzechnik, Slawomir K AU - Han, Gye Won AU - Jaroszewski, Lukasz AU - Klock, Heath E AU - Knuth, Mark W AU - Kozbial, Piotr AU - Krishna, S Sri AU - Kumar, Abhinav AU - Marciano, David AU - Morse, Andrew T AU - Nigoghossian, Edward AU - Okach, Linda AU - Paulsen, Jessica AU - Reyes, Ron AU - Rife, Christopher L AU - Sefcovic, Natasha AU - Tien, Henry J AU - Trame, Christine B AU - van den Bedem, Henry AU - Weekes, Dana AU - Xu, Qingping AU - Hodgson, Keith O AU - Wooley, John AU - Elsliger, Marc-André AU - Deacon, Ashley M AU - Godzik, Adam AU - Lesley, Scott A AU - Tainer, John A AU - Wilson, Ian A AD - Joint Center for Structural Genomics, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA. Y1 - 2010/04/02/ PY - 2010 DA - 2010 Apr 02 SP - 647 EP - 663 VL - 397 IS - 3 KW - Bacterial Proteins KW - 0 KW - DNA, Single-Stranded KW - DNA KW - 9007-49-2 KW - Endodeoxyribonucleases KW - EC 3.1.- KW - Exodeoxyribonucleases KW - Index Medicus KW - Molecular Sequence Data KW - Models, Chemical KW - Crystallography, X-Ray KW - Amino Acid Sequence KW - Sequence Homology, Amino Acid KW - Protein Conformation KW - DNA, Single-Stranded -- genetics KW - Endodeoxyribonucleases -- chemistry KW - DNA Repair KW - Bacterial Proteins -- chemistry KW - DNA -- genetics KW - DNA, Single-Stranded -- chemistry KW - Endodeoxyribonucleases -- genetics KW - DNA -- chemistry KW - Thermotoga maritima -- enzymology KW - Exodeoxyribonucleases -- genetics KW - Exodeoxyribonucleases -- chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/733792733?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+molecular+biology&rft.atitle=Crystal+structure+of+the+first+eubacterial+Mre11+nuclease+reveals+novel+features+that+may+discriminate+substrates+during+DNA+repair.&rft.au=Das%2C+Debanu%3BMoiani%2C+Davide%3BAxelrod%2C+Herbert+L%3BMiller%2C+Mitchell+D%3BMcMullan%2C+Daniel%3BJin%2C+Kevin+K%3BAbdubek%2C+Polat%3BAstakhova%2C+Tamara%3BBurra%2C+Prasad%3BCarlton%2C+Dennis%3BChiu%2C+Hsiu-Ju%3BClayton%2C+Thomas%3BDeller%2C+Marc+C%3BDuan%2C+Lian%3BErnst%2C+Dustin%3BFeuerhelm%2C+Julie%3BGrant%2C+Joanna+C%3BGrzechnik%2C+Anna%3BGrzechnik%2C+Slawomir+K%3BHan%2C+Gye+Won%3BJaroszewski%2C+Lukasz%3BKlock%2C+Heath+E%3BKnuth%2C+Mark+W%3BKozbial%2C+Piotr%3BKrishna%2C+S+Sri%3BKumar%2C+Abhinav%3BMarciano%2C+David%3BMorse%2C+Andrew+T%3BNigoghossian%2C+Edward%3BOkach%2C+Linda%3BPaulsen%2C+Jessica%3BReyes%2C+Ron%3BRife%2C+Christopher+L%3BSefcovic%2C+Natasha%3BTien%2C+Henry+J%3BTrame%2C+Christine+B%3Bvan+den+Bedem%2C+Henry%3BWeekes%2C+Dana%3BXu%2C+Qingping%3BHodgson%2C+Keith+O%3BWooley%2C+John%3BElsliger%2C+Marc-Andr%C3%A9%3BDeacon%2C+Ashley+M%3BGodzik%2C+Adam%3BLesley%2C+Scott+A%3BTainer%2C+John+A%3BWilson%2C+Ian+A&rft.aulast=Das&rft.aufirst=Debanu&rft.date=2010-04-02&rft.volume=397&rft.issue=3&rft.spage=647&rft.isbn=&rft.btitle=&rft.title=Journal+of+molecular+biology&rft.issn=1089-8638&rft_id=info:doi/10.1016%2Fj.jmb.2010.01.049 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2010-04-20 N1 - Date created - 2010-03-15 N1 - Date revised - 2017-02-17 N1 - Genetic sequence - 2Q8U; OMIM N1 - SuppNotes - Cited By: J Mol Biol. 2001 Aug 10;311(2):297-310 [11478862] Acta Crystallogr D Biol Crystallogr. 1998 Mar 1;54(Pt 2):243-52 [9761889] Mol Cell. 2001 Nov;8(5):1129-35 [11741547] Genetics. 2001 Dec;159(4):1423-33 [11779786] Mol Cell. 2001 Dec;8(6):1163-74 [11779493] Curr Opin Struct Biol. 2002 Feb;12(1):115-22 [11839498] Nat Rev Mol Cell Biol. 2002 May;3(5):317-27 [11988766] Trends Biochem Sci. 2002 Aug;27(8):410-8 [12151226] Proc Natl Acad Sci U S A. 2002 Sep 3;99(18):11664-9 [12193646] Acta Crystallogr D Biol Crystallogr. 2002 Oct;58(Pt 10 Pt 2):1772-9 [12351820] J Synchrotron Radiat. 2002 Nov 1;9(Pt 6):401-6 [12409628] Curr Opin Struct Biol. 2003 Apr;13(2):249-55 [12727520] Acta Crystallogr D Biol Crystallogr. 2003 Jul;59(Pt 7):1174-82 [12832760] Mol Cell Biol. 2003 Sep;23(18):6564-73 [12944482] Protein Eng. 1998 Sep;11(9):739-47 [9796821] Acta Crystallogr D Biol Crystallogr. 1999 Jan;55(Pt 1):191-205 [10089410] Bioinformatics. 1999 Apr;15(4):305-8 [10320398] Microbiol Mol Biol Rev. 1999 Jun;63(2):349-404 [10357855] Acta Crystallogr D Biol Crystallogr. 2004 Dec;60(Pt 12 Pt 1):2126-32 [15572765] Nucleic Acids Res. 2005 Jan 1;33(Database issue):D266-8 [15608193] EMBO J. 2005 Mar 9;24(5):885-94 [15692561] DNA Repair (Amst). 2005 Jun 8;4(6):639-48 [15907771] Nucleic Acids Res. 2005 Jul 1;33(Web Server issue):W299-302 [15980475] Methods Mol Biol. 2007;364:215-30 [17172768] Int J Radiat Oncol Biol Phys. 2007 Jan 1;67(1):273-8 [17189075] Nucleic Acids Res. 2007 Jan;35(Database issue):D237-40 [17135202] J Bacteriol. 2007 Jul;189(13):4784-90 [17483232] Biochem Cell Biol. 2007 Aug;85(4):509-20 [17713585] Cell. 1999 Dec 10;99(6):577-87 [10612394] Nature. 2000 Jan 27;403(6768):451-6 [10667800] Acta Crystallogr D Biol Crystallogr. 2000 Mar;56(Pt 3):249-65 [10713511] Arch Dis Child. 2000 May;82(5):400-6 [10799436] Acta Crystallogr D Biol Crystallogr. 2000 Aug;56(Pt 8):965-72 [10944333] Bioinformatics. 2000 Jun;16(6):566-7 [10980157] Cell. 2001 May 18;105(4):473-85 [11371344] J Mol Biol. 2007 Sep 21;372(3):774-97 [17681537] Nucleic Acids Res. 2008 Jan;36(Database issue):D281-8 [18039703] Proteins. 2008 May 1;71(2):982-94 [18004753] Cell. 2008 Oct 3;135(1):97-109 [18854158] Nat Struct Mol Biol. 2009 Feb;16(2):138-43 [19136958] Mol Oncol. 2008 Dec;2(4):296-316 [19383352] Methods Enzymol. 2003;374:300-21 [14696379] Nucleic Acids Res. 2004;32(6):1886-93 [15047855] Nucleic Acids Res. 2004 Jul 1;32(Web Server issue):W615-9 [15215462] Acta Crystallogr D Biol Crystallogr. 2004 Oct;60(Pt 10):1833-9 [15388930] J Mol Biol. 1968 Apr 28;33(2):491-7 [5700707] Proc Natl Acad Sci U S A. 1980 Dec;77(12):7315-7 [6938978] Prog Nucleic Acid Res Mol Biol. 1988;35:95-125 [3065826] J Mol Graph. 1990 Mar;8(1):52-6, 29 [2268628] Nucleic Acids Res. 1994 Nov 11;22(22):4673-80 [7984417] Cell. 1995 Aug 11;82(3):507-22 [7543369] Mol Microbiol. 1995 Sep;17(6):1215-7 [8594339] EMBO J. 1997 Jan 15;16(2):430-8 [9029161] Adv Immunol. 1997;64:39-64 [9100979] Genes Cells. 1996 Mar;1(3):285-91 [9133662] EMBO J. 1997 Jun 2;16(11):3332-40 [9214648] Nucleic Acids Res. 1997 Sep 1;25(17):3389-402 [9254694] Mol Cell. 1998 Jun;1(7):969-79 [9651580] Proc Natl Acad Sci U S A. 1998 Jul 7;95(14):7969-74 [9653124] Proteins. 1998 Jul 1;32(1):1-2 [9672036] Nucleic Acids Res. 1998 Aug 15;26(16):3746-52 [9685491] Genetics. 1998 Oct;150(2):591-600 [9755192] Mol Cell. 2001 Nov;8(5):1105-15 [11741545] N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1016/j.jmb.2010.01.049 ER - TY - JOUR T1 - X-ray absorption spectroscopy and X-ray Raman scattering of water and ice; an experimental view AN - 746229465; 12986433 AB - Here we present a review of X-ray absorption spectroscopy and X-ray Raman scattering with the perspective to understand the spectra of water including changes with temperature, mass of the water molecule and presence of monovalent ions. The different detection schemes are discussed and it is concluded that transmission X-ray absorption measurements, using a small area where the thickness is uniform, and X-ray Raman scattering give the most reliable spectra. Different model systems are discussed such as the surface and bulk of ice and various adsorbed monolayer structures on metal surfaces. JF - Journal of Electron Spectroscopy and Related Phenomena AU - Nilsson, A AU - Nordlund, D AU - Waluyo, I AU - Huang, N AU - Ogasawara, H AU - Kaya, S AU - Bergmann, U AU - Naeslund, L-Aa AU - Oestroem, H AU - Wernet, Ph AU - Andersson, K J AU - Schiros, T AU - Pettersson, LGM AD - Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA, nilsson@slac.stanford.edu nilsson@slac.stanford.edu nilsson@slac.stanford.edu nilsson@slac.stanford.edu Y1 - 2010/03// PY - 2010 DA - Mar 2010 SP - 99 EP - 129 PB - Elsevier Science, P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 177 IS - 2-3 SN - 0368-2048, 0368-2048 KW - Biotechnology and Bioengineering Abstracts KW - Ice KW - Ions KW - Metals KW - Ionizing radiation KW - Reviews KW - X-ray absorption spectroscopy KW - Water temperature KW - Spectroscopy KW - W 30900:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/746229465?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Electron+Spectroscopy+and+Related+Phenomena&rft.atitle=X-ray+absorption+spectroscopy+and+X-ray+Raman+scattering+of+water+and+ice%3B+an+experimental+view&rft.au=Nilsson%2C+A%3BNordlund%2C+D%3BWaluyo%2C+I%3BHuang%2C+N%3BOgasawara%2C+H%3BKaya%2C+S%3BBergmann%2C+U%3BNaeslund%2C+L-Aa%3BOestroem%2C+H%3BWernet%2C+Ph%3BAndersson%2C+K+J%3BSchiros%2C+T%3BPettersson%2C+LGM&rft.aulast=Nilsson&rft.aufirst=A&rft.date=2010-03-01&rft.volume=177&rft.issue=2-3&rft.spage=99&rft.isbn=&rft.btitle=&rft.title=Journal+of+Electron+Spectroscopy+and+Related+Phenomena&rft.issn=03682048&rft_id=info:doi/10.1016%2Fj.elspec.2010.02.005 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-06-01 N1 - Last updated - 2011-12-14 N1 - SubjectsTermNotLitGenreText - Metals; Ions; Ice; Reviews; Ionizing radiation; X-ray absorption spectroscopy; Water temperature; Spectroscopy DO - http://dx.doi.org/10.1016/j.elspec.2010.02.005 ER - TY - JOUR T1 - Sulfidation of silver nanoparticles AN - 886905523; 2011-072385 JF - Geochimica et Cosmochimica Acta AU - Levard, Clement AU - Michel, Marc AU - Brown, Gordon E, Jr AU - Anonymous Y1 - 2010 PY - 2010 DA - 2010 SP - 1 PB - Elsevier, New York, NY VL - 74 IS - 12, Suppl. 1 SN - 0016-7037, 0016-7037 KW - soils KW - corrosion KW - sulfidation KW - experimental studies KW - X-ray diffraction data KW - silver KW - pollution KW - solution KW - laboratory studies KW - acanthite KW - toxicity KW - chemical reactions KW - soil pollution KW - precipitation KW - metals KW - spectra KW - X-ray photoelectron spectra KW - sulfides KW - nanoparticles KW - geochemistry KW - SEM data KW - pH KW - Eh KW - 22:Environmental geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/886905523?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Sulfidation+of+silver+nanoparticles&rft.au=Levard%2C+Clement%3BMichel%2C+Marc%3BBrown%2C+Gordon+E%2C+Jr%3BAnonymous&rft.aulast=Levard&rft.aufirst=Clement&rft.date=2010-01-01&rft.volume=74&rft.issue=12%2C+Suppl.+1&rft.spage=A584&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/ L2 - http://goldschmidt.info/2010/abstracts/A-Z+Index.pdf http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Conference title - 20th annual V. M. Goldschmidt conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2011-01-01 N1 - PubXState - NY N1 - Last updated - 2014-09-18 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - acanthite; chemical reactions; corrosion; Eh; experimental studies; geochemistry; laboratory studies; metals; nanoparticles; pH; pollution; precipitation; SEM data; silver; soil pollution; soils; solution; spectra; sulfidation; sulfides; toxicity; X-ray diffraction data; X-ray photoelectron spectra ER - TY - JOUR T1 - Nanotextures of aragonite in stromatolites from the quasi-marine Satonda Crater Lake, Indonesia AN - 759304829; 2010-087223 AB - Stromatolites have been extensively used as indicators of ancient life on Earth. Although much work has been done on modern stromatolites, the extent to which biological processes control their structure, and the respective contributions of biological and abiotic processes in their formation are, however, still poorly constrained. A better description of the mineralogical textures of these formations at the submicrometre scale may help improve our understanding of how carbonates nucleate and grow in stromatolites. Here, we used a combination of microscopy and microspectroscopy techniques to study the chemical composition and the texture of aragonite in lacustrine stromatolites from the alkaline crator lake in Satonda, Indonesia. Several textural features are described, including morphological variations of aragonite from nanosized grains to micrometer-sized fibers, the presence of striations in the aragonite laminae showing a striking similarity with growth bands in corals, and clusters of small aragonite crystals sharing a common crystallographic orientation. These nanotextural features are compared with those observed in scleractinian corals, and possible processes involved in their formation are discussed. JF - Geological Society Special Publications AU - Benzerara, Karim AU - Meibom, Anders AU - Gautier, Quentin AU - Kazmierczak, Jozef AU - Stolarski, Jaroslaw AU - Menguy, Nicolas AU - Brown, Gordon E, Jr A2 - Pedley, H. Martyn A2 - Rogerson, Mike Y1 - 2010 PY - 2010 DA - 2010 SP - 211 EP - 224 PB - Geological Society of London, London VL - 336 SN - 0305-8719, 0305-8719 KW - processes KW - Far East KW - aragonite KW - textures KW - biogenic structures KW - biochemistry KW - Indonesia KW - stromatolites KW - sampling KW - Satonda Crater Lake KW - Asia KW - sedimentary structures KW - geochemistry KW - carbonates KW - 06A:Sedimentary petrology KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/759304829?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geological+Society+Special+Publications&rft.atitle=Nanotextures+of+aragonite+in+stromatolites+from+the+quasi-marine+Satonda+Crater+Lake%2C+Indonesia&rft.au=Benzerara%2C+Karim%3BMeibom%2C+Anders%3BGautier%2C+Quentin%3BKazmierczak%2C+Jozef%3BStolarski%2C+Jaroslaw%3BMenguy%2C+Nicolas%3BBrown%2C+Gordon+E%2C+Jr&rft.aulast=Benzerara&rft.aufirst=Karim&rft.date=2010-01-01&rft.volume=336&rft.issue=&rft.spage=211&rft.isbn=&rft.btitle=&rft.title=Geological+Society+Special+Publications&rft.issn=03058719&rft_id=info:doi/10.1144%2FSP336.10 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom N1 - Date revised - 2010-01-01 N1 - Number of references - 70 N1 - Document feature - illus. incl. 6 plates N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - aragonite; Asia; biochemistry; biogenic structures; carbonates; Far East; geochemistry; Indonesia; processes; sampling; Satonda Crater Lake; sedimentary structures; stromatolites; textures DO - http://dx.doi.org/10.1144/SP336.10 ER - TY - CPAPER T1 - Recent results on two-photon physics at BABAR T2 - XIII International Conference on Hadron Spectroscopy (Hadron 2009) AN - 42260661; 5608882 JF - XIII International Conference on Hadron Spectroscopy (Hadron 2009) AU - Li, Selina Y1 - 2009/11/29/ PY - 2009 DA - 2009 Nov 29 KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/42260661?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=XIII+International+Conference+on+Hadron+Spectroscopy+%28Hadron+2009%29&rft.atitle=Recent+results+on+two-photon+physics+at+BABAR&rft.au=Li%2C+Selina&rft.aulast=Li&rft.aufirst=Selina&rft.date=2009-11-29&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=XIII+International+Conference+on+Hadron+Spectroscopy+%28Hadron+2009%29&rft.issn=&rft_id=info:doi/ L2 - http://hadron.physics.fsu.edu/MaKaC/conferenceDisplay.py/abstractBookP erform?confId=0 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-04-06 N1 - Last updated - 2010-05-03 ER - TY - CPAPER T1 - Studies of bottomonium at BaBar T2 - XIII International Conference on Hadron Spectroscopy (Hadron 2009) AN - 42259169; 5608915 JF - XIII International Conference on Hadron Spectroscopy (Hadron 2009) AU - West, Christopher Y1 - 2009/11/29/ PY - 2009 DA - 2009 Nov 29 KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/42259169?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=XIII+International+Conference+on+Hadron+Spectroscopy+%28Hadron+2009%29&rft.atitle=Studies+of+bottomonium+at+BaBar&rft.au=West%2C+Christopher&rft.aulast=West&rft.aufirst=Christopher&rft.date=2009-11-29&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=XIII+International+Conference+on+Hadron+Spectroscopy+%28Hadron+2009%29&rft.issn=&rft_id=info:doi/ L2 - http://hadron.physics.fsu.edu/MaKaC/conferenceDisplay.py/abstractBookP erform?confId=0 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-04-06 N1 - Last updated - 2010-05-03 ER - TY - JOUR T1 - Leadership and Emotional Intelligence: A Study of University Library Directors and Their Senior Management Teams AN - 57740765; 201001331 AB - Drawing on the results of a survey sent to library directors and senior management team members working in Association of Research Libraries member libraries in the Western United States, this study explores the ideal emotional intelligence traits of both academic library directors and the members of their senior management teams. Respondents were asked to identify the top ten ideal traits needed by directors and senior management team members. The study explores the extent to which each respondent agreed on the most important emotional intelligence traits for each organizational role. Results include lists of the top ten ideal traits for each organizational role and the top ten ideal shared traits for library leaders. Adapted from the source document. JF - College & Research Libraries AU - Kreitz, Patricia A AD - Technical Information Services, SLAC National Accelerator Laboratory, Stanford University pkreitz@slac.stanford.edu Y1 - 2009/11// PY - 2009 DA - November 2009 SP - 531 EP - 554 PB - Association of College and Research Libraries VL - 70 IS - 6 SN - 0010-0870, 0010-0870 KW - Intelligence KW - Chief librarians KW - Leadership KW - article KW - 6.11: LIBRARY MANAGEMENT (OTHER THAN PERSONNEL MANAGEMENT) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/57740765?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=College+%26+Research+Libraries&rft.atitle=Leadership+and+Emotional+Intelligence%3A+A+Study+of+University+Library+Directors+and+Their+Senior+Management+Teams&rft.au=Kreitz%2C+Patricia+A&rft.aulast=Kreitz&rft.aufirst=Patricia&rft.date=2009-11-01&rft.volume=70&rft.issue=6&rft.spage=531&rft.isbn=&rft.btitle=&rft.title=College+%26+Research+Libraries&rft.issn=00100870&rft_id=info:doi/ LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2010-02-03 N1 - Last updated - 2016-09-27 N1 - SubjectsTermNotLitGenreText - Leadership; Intelligence; Chief librarians ER - TY - CPAPER T1 - Ordered Ferrimagnetic Form of Ferrihydrite Reveals Links between Structure, Composition and Magnetism T2 - 2009 Annual Meeting of the Geology Society of America AN - 42148051; 5547871 JF - 2009 Annual Meeting of the Geology Society of America AU - Michel, F AU - Barron, Vidal AU - Torrent, Jose AU - Morales, Maria AU - Serna, C AU - Boily, Jean-Francois AU - Liu, Qingsong AU - Ambrosini, Andrea AU - Cismasu, Cristina AU - Brown, Gordon Y1 - 2009/10/18/ PY - 2009 DA - 2009 Oct 18 KW - Magnetism KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/42148051?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2009+Annual+Meeting+of+the+Geology+Society+of+America&rft.atitle=Ordered+Ferrimagnetic+Form+of+Ferrihydrite+Reveals+Links+between+Structure%2C+Composition+and+Magnetism&rft.au=Michel%2C+F%3BBarron%2C+Vidal%3BTorrent%2C+Jose%3BMorales%2C+Maria%3BSerna%2C+C%3BBoily%2C+Jean-Francois%3BLiu%2C+Qingsong%3BAmbrosini%2C+Andrea%3BCismasu%2C+Cristina%3BBrown%2C+Gordon&rft.aulast=Michel&rft.aufirst=F&rft.date=2009-10-18&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2009+Annual+Meeting+of+the+Geology+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - http://gsa.confex.com/gsa/2009AM/finalprogram/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-04-06 N1 - Last updated - 2010-05-03 ER - TY - CPAPER T1 - Status of the EXO-200 Experiment T2 - Third Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and The Physical Society of Japan (JPS/DNP 2009) AN - 42496300; 5438565 JF - Third Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and The Physical Society of Japan (JPS/DNP 2009) AU - Yang, Liang Y1 - 2009/10/13/ PY - 2009 DA - 2009 Oct 13 KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/42496300?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=Third+Joint+Meeting+of+the+Nuclear+Physics+Divisions+of+the+American+Physical+Society+and+The+Physical+Society+of+Japan+%28JPS%2FDNP+2009%29&rft.atitle=Status+of+the+EXO-200+Experiment&rft.au=Yang%2C+Liang&rft.aulast=Yang&rft.aufirst=Liang&rft.date=2009-10-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Third+Joint+Meeting+of+the+Nuclear+Physics+Divisions+of+the+American+Physical+Society+and+The+Physical+Society+of+Japan+%28JPS%2FDNP+2009%29&rft.issn=&rft_id=info:doi/ L2 - http://meetings.aps.org/Meeting/HAW09/sessionindex2 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-04-06 N1 - Last updated - 2010-05-03 ER - TY - CPAPER T1 - In Situ GIXAFS and HERFD-XAS Studies of a Pt-modified Rh(111) Electrode T2 - 216th Meeting of the Electrochemical Society (216th ECS) AN - 42033219; 5498455 JF - 216th Meeting of the Electrochemical Society (216th ECS) AU - Friebel, D AU - Miller, D AU - Ogasawara, H AU - Anniyev, T AU - O'Grady, C AU - Bergmann, U AU - Bargar, J AU - Nilsson, A AU - Wikfeldt, K AU - Pettersson, L Y1 - 2009/10/04/ PY - 2009 DA - 2009 Oct 04 KW - Electrodes KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/42033219?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=216th+Meeting+of+the+Electrochemical+Society+%28216th+ECS%29&rft.atitle=In+Situ+GIXAFS+and+HERFD-XAS+Studies+of+a+Pt-modified+Rh%28111%29+Electrode&rft.au=Friebel%2C+D%3BMiller%2C+D%3BOgasawara%2C+H%3BAnniyev%2C+T%3BO%27Grady%2C+C%3BBergmann%2C+U%3BBargar%2C+J%3BNilsson%2C+A%3BWikfeldt%2C+K%3BPettersson%2C+L&rft.aulast=Friebel&rft.aufirst=D&rft.date=2009-10-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=216th+Meeting+of+the+Electrochemical+Society+%28216th+ECS%29&rft.issn=&rft_id=info:doi/ L2 - http://www.electrochem.org/meetings/biannual/216/assets/216_mtg_progra m.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-04-06 N1 - Last updated - 2010-05-03 ER - TY - JOUR T1 - Evidence for Different Surface Speciation of Arsenite and Arsenate on Green Rust: An EXAFS and XANES Study AN - 754542950; 13268449 AB - The knowledge of arsenic speciation at the surface of green rusts (GRs), [FeII(1-x)FeIIIx (OH)2]x+ (CO3, Cl, SO4)x-, is environmentally relevant because arsenic sorption onto GRs could contribute to arsenic retention in anoxic environments (hydromorphic soils, marine sediments, etc.). The nature of arsenic adsorption complexes on hydroxychloride green rust 1 (GR1Cl) at near-neutral pH under anoxic conditions was investigated using extended X-ray absorption fine structure (EXAFS) spectroscopy at the As K-edge. Sorption data indicate that As(V) sorbs more efficiently than As(III) at the studied As loadings (0.27 mu mol m super(-2) and 2.7 mu mol m super(-2)). EXAFS results indicate that arsenite [As(III)] and arsenate [As(V)] form inner-sphere complexes on the surface of GR1Cl at arsenic surface coverages of 0.27 and 2.70 mu mol m super(-2), with distinct types of As(III) and As(V) sorption complexes, which change in relative concentration as a function of arsenic loading. For As(V), the EXAFS-derived As-Fe distances (3.34 plus or minus 0.02 and 3.49 plus or minus 0.02 A) suggest the presence of binuclear bidentate double-corner complexes (2 degree C) and monodentate mononuclear corner-sharing complexes (1V). For As(III), EXAFS-derived As-As distance (3.32 plus or minus 0.02 A) and As-Fe distances (3.49 plus or minus 0.02 and 4.72 plus or minus 0.02 A) are consistent with the presence of dimers of As(III) pyramids binding to the edges of the GR1Cl layers by corner sharing with FeO6 octahedra. However, 2C and 1V As(III) complexes cannot be excluded. These results improve our knowledge of the mode of As(V) and As(III) inner-sphere adsorption on green rusts, which will help to constrain sorption modeling of arsenic in soils, sediments, and aquifers. JF - Environmental Science & Technology AU - Wang, Yuheng AU - Morin, Guillaume AU - Ona-Nguema, Georges AU - Juillot, Farid AU - Guyot, Franois AU - Calas, Georges AU - Brown Jr, Gordon E AD - Institut de Minralogie et de Physique des Milieux Condenss (IMPMC), UMR 7590, CNRS, Universit Paris 6 (UPMC), Universit Paris 7 (UPD), IPGP, 140, rue de Lourmel, 75015 Paris, France, Surface & Aqueous Geochemistry Group, Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305-2115, and Stanford Synchrotron Radiation Lightsource, SLAC, National Accelerator Laboratory, 2575 Sand Hill Road, MS 69, Menlo Park, California 94025 Y1 - 2009/10/01/ PY - 2009 DA - 2009 Oct 01 SP - 109 EP - 115 PB - American Chemical Society, 1155 16th St., NW Washington DC 20036 USA VL - 44 IS - 1 SN - 0013-936X, 0013-936X KW - Pollution Abstracts; Sustainability Science Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality; Oceanic Abstracts; Environment Abstracts KW - Aquifers KW - Sorption KW - Arsenic KW - Spectroscopy KW - Arsenates KW - Environmental factors KW - Sediments KW - Soil KW - Absorption spectroscopy KW - Anoxic conditions KW - arsenates KW - Adsorption KW - Absorption KW - Ground water KW - Ultrastructure KW - pH KW - Q5 08503:Characteristics, behavior and fate KW - M3 1010:Issues in Sustainable Development KW - P 1000:MARINE POLLUTION KW - ENA 12:Oceans & Estuaries KW - O 2050:Chemical Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/754542950?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aasfaaquaticpollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Science+%26+Technology&rft.atitle=Evidence+for+Different+Surface+Speciation+of+Arsenite+and+Arsenate+on+Green+Rust%3A+An+EXAFS+and+XANES+Study&rft.au=Wang%2C+Yuheng%3BMorin%2C+Guillaume%3BOna-Nguema%2C+Georges%3BJuillot%2C+Farid%3BGuyot%2C+Franois%3BCalas%2C+Georges%3BBrown+Jr%2C+Gordon+E&rft.aulast=Wang&rft.aufirst=Yuheng&rft.date=2009-10-01&rft.volume=44&rft.issue=1&rft.spage=109&rft.isbn=&rft.btitle=&rft.title=Environmental+Science+%26+Technology&rft.issn=0013936X&rft_id=info:doi/10.1021%2Fes901627e L2 - http://pubs.acs.org/doi/abs/10.1021/es901627e LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-08-01 N1 - Last updated - 2015-10-28 N1 - SubjectsTermNotLitGenreText - Sorption; Absorption spectroscopy; Arsenic; Anoxic conditions; Ground water; Ultrastructure; Arsenates; Environmental factors; Aquifers; Soil; arsenates; Absorption; Adsorption; Spectroscopy; pH; Sediments DO - http://dx.doi.org/10.1021/es901627e ER - TY - CPAPER T1 - Matter, Energy, and the Universe T2 - 2009 VIP Symposia on Internet related research with elements of M+I+T++ (VIPSI-2009) AN - 42508850; 5447390 JF - 2009 VIP Symposia on Internet related research with elements of M+I+T++ (VIPSI-2009) AU - Perl, Martin Y1 - 2009/09/24/ PY - 2009 DA - 2009 Sep 24 KW - Energy KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/42508850?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2009+VIP+Symposia+on+Internet+related+research+with+elements+of+M%2BI%2BT%2B%2B+%28VIPSI-2009%29&rft.atitle=Matter%2C+Energy%2C+and+the+Universe&rft.au=Perl%2C+Martin&rft.aulast=Perl&rft.aufirst=Martin&rft.date=2009-09-24&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2009+VIP+Symposia+on+Internet+related+research+with+elements+of+M%2BI%2BT%2B%2B+%28VIPSI-2009%29&rft.issn=&rft_id=info:doi/ L2 - http://internetconferences.net/ipsi/importantbefore.php?id_imp=122 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2010-04-06 N1 - Last updated - 2010-05-03 ER - TY - CPAPER T1 - The Linac Coherent Light Source and Radiological Issues during the Commissioning T2 - 11th International Symposium on Radiation Physics (ISRP-11) AN - 42367664; 5381252 JF - 11th International Symposium on Radiation Physics (ISRP-11) AU - Mao, Stan Y1 - 2009/09/20/ PY - 2009 DA - 2009 Sep 20 KW - Light sources KW - Light effects KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/42367664?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=English+Today&rft.atitle=Some+notes+on+teaching+myself+Russian&rft.au=Blaisdell%2C+Bob&rft.aulast=Blaisdell&rft.aufirst=Bob&rft.date=2006-04-01&rft.volume=22&rft.issue=2&rft.spage=31&rft.isbn=&rft.btitle=&rft.title=English+Today&rft.issn=02660784&rft_id=info:doi/ L2 - http://www.mcmconferences.com/isrp11/program.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-12-18 N1 - Last updated - 2010-05-03 ER - TY - JOUR T1 - Structural and Functional Characterizations of SsgB, a Conserved Activator of Developmental Cell Division in Morphologically Complex Actinomycetes AN - 21174956; 11259618 AB - SsgA-like proteins (SALPs) are a family of homologous cell division-related proteins that occur exclusively in morphologically complex actinomycetes. We show that SsgB, a subfamily of SALPs, is the archetypal SALP that is functionally conserved in all sporulating actinomycetes. Sporulation-specific cell division of Streptomyces coelicolor ssgB mutants is restored by introduction of distant ssgB orthologues from other actinomycetes. Interestingly, the number of septa (and spores) of the complemented null mutants is dictated by the specific ssgB orthologue that is expressed. The crystal structure of the SsgB from Thermobifida fusca was determined at 2.6 Aa resolution and represents the first structure for this family. The structure revealed similarities to a class of eukaryotic `whirly- single-stranded DNA/RNA- binding proteins. However, the electro-negative surface of the SALPs suggests that neither SsgB nor any of the other SALPs are likely to interact with nucleotide substrates. Instead, we show that a conserved hydrophobic surface is likely to be important for SALP function and suggest that proteins are the likely binding partners. JF - Journal of Biological Chemistry AU - Xu, Qingping AU - Traag, Bjoe¸rn A AU - Willemse, Joost AU - McMullan, Daniel AU - Miller, Mitchell D AU - Elsliger, Marc-Andre AU - Abdubek, Polat AU - Astakhova, Tamara AU - Axelrod, Herbert L AU - Bakolitsa, Constantina AU - Carlton, Dennis AU - Chen, Connie AU - Chiu, Hsiu-Ju AU - Chruszcz, Maksymilian AU - Clayton, Thomas AU - Das, Debanu AU - Deller, Marc C AU - Duan, Lian AU - Ellrott, Kyle AU - Ernst, Dustin AU - Farr, Carol L AU - Feuerhelm, Julie AU - Grant, Joanna C AU - Grzechnik, Anna AU - Grzechnik, Slawomir K AU - Han, Gye Won AU - Jaroszewski, Lukasz AU - Jin, Kevin K AU - Klock, Heath E AU - Knuth, Mark W AU - Kozbial, Piotr AU - Krishna, SSri AU - Kumar, Abhinav AU - Marciano, David AU - Minor, Wladek AU - Mommaas, AMieke AU - Morse, Andrew T AU - Nigoghossian, Edward AU - Nopakun, Amanda AU - Okach, Linda AU - Oommachen, Silvya AU - Paulsen, Jessica AU - Puckett, Christina AU - Reyes, Ron AU - Rife, Christopher L AU - Sefcovic, Natasha AU - Tien, Henry J AU - Trame, Christine B AU - Van den Bedem, Henry AU - Wang, Shuren AU - Weekes, Dana AU - Hodgson, Keith O AU - Wooley, John AU - Deacon, Ashley M AU - Godzik, Adam AU - Lesley, Scott A AU - Wilson, Ian A AU - Van Wezel, Gilles P AD - Joint Center for Structural Genomics, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025 Y1 - 2009/09// PY - 2009 DA - September 2009 PB - American Society for Biochemistry and Molecular Biology, 9650 Rockville Pike Bethesda MD 20814-3996 USA VL - 284 IS - 37 SN - 0021-9258, 0021-9258 KW - ASFA 1: Biological Sciences & Living Resources; Microbiology Abstracts B: Bacteriology KW - Marine KW - DNA-binding protein KW - Streptomyces coelicolor KW - Hydrophobicity KW - Nucleotides KW - Cell division KW - Structure-function relationships KW - Crystal structure KW - DNA KW - Septum KW - Spores KW - Actinomycetes KW - Q1 08183:Taxonomy and morphology KW - J 02320:Cell Biology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/21174956?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Biological+Chemistry&rft.atitle=Structural+and+Functional+Characterizations+of+SsgB%2C+a+Conserved+Activator+of+Developmental+Cell+Division+in+Morphologically+Complex+Actinomycetes&rft.au=Xu%2C+Qingping%3BTraag%2C+Bjoe%C2%B8rn+A%3BWillemse%2C+Joost%3BMcMullan%2C+Daniel%3BMiller%2C+Mitchell+D%3BElsliger%2C+Marc-Andre%3BAbdubek%2C+Polat%3BAstakhova%2C+Tamara%3BAxelrod%2C+Herbert+L%3BBakolitsa%2C+Constantina%3BCarlton%2C+Dennis%3BChen%2C+Connie%3BChiu%2C+Hsiu-Ju%3BChruszcz%2C+Maksymilian%3BClayton%2C+Thomas%3BDas%2C+Debanu%3BDeller%2C+Marc+C%3BDuan%2C+Lian%3BEllrott%2C+Kyle%3BErnst%2C+Dustin%3BFarr%2C+Carol+L%3BFeuerhelm%2C+Julie%3BGrant%2C+Joanna+C%3BGrzechnik%2C+Anna%3BGrzechnik%2C+Slawomir+K%3BHan%2C+Gye+Won%3BJaroszewski%2C+Lukasz%3BJin%2C+Kevin+K%3BKlock%2C+Heath+E%3BKnuth%2C+Mark+W%3BKozbial%2C+Piotr%3BKrishna%2C+SSri%3BKumar%2C+Abhinav%3BMarciano%2C+David%3BMinor%2C+Wladek%3BMommaas%2C+AMieke%3BMorse%2C+Andrew+T%3BNigoghossian%2C+Edward%3BNopakun%2C+Amanda%3BOkach%2C+Linda%3BOommachen%2C+Silvya%3BPaulsen%2C+Jessica%3BPuckett%2C+Christina%3BReyes%2C+Ron%3BRife%2C+Christopher+L%3BSefcovic%2C+Natasha%3BTien%2C+Henry+J%3BTrame%2C+Christine+B%3BVan+den+Bedem%2C+Henry%3BWang%2C+Shuren%3BWeekes%2C+Dana%3BHodgson%2C+Keith+O%3BWooley%2C+John%3BDeacon%2C+Ashley+M%3BGodzik%2C+Adam%3BLesley%2C+Scott+A%3BWilson%2C+Ian+A%3BVan+Wezel%2C+Gilles+P&rft.aulast=Xu&rft.aufirst=Qingping&rft.date=2009-09-01&rft.volume=284&rft.issue=37&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Biological+Chemistry&rft.issn=00219258&rft_id=info:doi/10.1074%2Fjbc.M109.018564 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-12-01 N1 - Last updated - 2016-02-18 N1 - SubjectsTermNotLitGenreText - Cell division; DNA; Spores; Nucleotides; Structure-function relationships; DNA-binding protein; Crystal structure; Hydrophobicity; Septum; Actinomycetes; Streptomyces coelicolor; Marine DO - http://dx.doi.org/10.1074/jbc.M109.018564 ER - TY - CPAPER T1 - Radioisotope Electric Propulsion for Deep Space Sample Return T2 - 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit (JPC 2009) AN - 40411475; 5303233 JF - 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit (JPC 2009) AU - Noble, Robert Y1 - 2009/08/02/ PY - 2009 DA - 2009 Aug 02 KW - Radioisotopes KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/40411475?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=45th+AIAA%2FASME%2FSAE%2FASEE+Joint+Propulsion+Conference+%26+Exhibit+%28JPC+2009%29&rft.atitle=Radioisotope+Electric+Propulsion+for+Deep+Space+Sample+Return&rft.au=Noble%2C+Robert&rft.aulast=Noble&rft.aufirst=Robert&rft.date=2009-08-02&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=45th+AIAA%2FASME%2FSAE%2FASEE+Joint+Propulsion+Conference+%26+Exhibit+%28JPC+2009%29&rft.issn=&rft_id=info:doi/ L2 - http://www.aiaa.org/agenda.cfm?lumeetingid=1980&viewcon=agenda&pagevie w=2&programSeeview=1&dateget=All&formatview=1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-09-28 N1 - Last updated - 2010-05-03 ER - TY - CPAPER T1 - A Fusing Switch for Fault Suppression in the SNS High Voltage Converter Modulators T2 - 17th IEEE International Pulsed Power Conference (PPC 2009) AN - 40286458; 5235989 JF - 17th IEEE International Pulsed Power Conference (PPC 2009) AU - Kemp, M AU - Burkhart, C AU - Nguyen, M AU - Anderson, D Y1 - 2009/06/28/ PY - 2009 DA - 2009 Jun 28 KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/40286458?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=17th+IEEE+International+Pulsed+Power+Conference+%28PPC+2009%29&rft.atitle=A+Fusing+Switch+for+Fault+Suppression+in+the+SNS+High+Voltage+Converter+Modulators&rft.au=Kemp%2C+M%3BBurkhart%2C+C%3BNguyen%2C+M%3BAnderson%2C+D&rft.aulast=Kemp&rft.aufirst=M&rft.date=2009-06-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=17th+IEEE+International+Pulsed+Power+Conference+%28PPC+2009%29&rft.issn=&rft_id=info:doi/ L2 - http://ppc.missouri.edu/Abstracts.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-09-28 N1 - Last updated - 2010-05-03 ER - TY - CPAPER T1 - Design Considerations for a PEBB-based Marx-topology ILC Klystron Modulator T2 - 17th IEEE International Pulsed Power Conference (PPC 2009) AN - 40285969; 5235837 JF - 17th IEEE International Pulsed Power Conference (PPC 2009) AU - Macken, K AU - Beukers, T AU - Burkhart, C AU - Kemp, M AU - Nguyen, M AU - Tang, T Y1 - 2009/06/28/ PY - 2009 DA - 2009 Jun 28 KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/40285969?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=17th+IEEE+International+Pulsed+Power+Conference+%28PPC+2009%29&rft.atitle=Design+Considerations+for+a+PEBB-based+Marx-topology+ILC+Klystron+Modulator&rft.au=Macken%2C+K%3BBeukers%2C+T%3BBurkhart%2C+C%3BKemp%2C+M%3BNguyen%2C+M%3BTang%2C+T&rft.aulast=Macken&rft.aufirst=K&rft.date=2009-06-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=17th+IEEE+International+Pulsed+Power+Conference+%28PPC+2009%29&rft.issn=&rft_id=info:doi/ L2 - http://ppc.missouri.edu/Abstracts.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-09-28 N1 - Last updated - 2010-05-03 ER - TY - CPAPER T1 - A Hierarchical Control Architecture for a PEBB-based ILC Marx Modulator T2 - 17th IEEE International Pulsed Power Conference (PPC 2009) AN - 40283218; 5235840 JF - 17th IEEE International Pulsed Power Conference (PPC 2009) AU - Macken, K AU - Burkhart, C AU - Larsen, R AU - Nguyen, M AU - Olsen, J Y1 - 2009/06/28/ PY - 2009 DA - 2009 Jun 28 KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/40283218?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=17th+IEEE+International+Pulsed+Power+Conference+%28PPC+2009%29&rft.atitle=A+Hierarchical+Control+Architecture+for+a+PEBB-based+ILC+Marx+Modulator&rft.au=Macken%2C+K%3BBurkhart%2C+C%3BLarsen%2C+R%3BNguyen%2C+M%3BOlsen%2C+J&rft.aulast=Macken&rft.aufirst=K&rft.date=2009-06-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=17th+IEEE+International+Pulsed+Power+Conference+%28PPC+2009%29&rft.issn=&rft_id=info:doi/ L2 - http://ppc.missouri.edu/Abstracts.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-09-28 N1 - Last updated - 2010-05-03 ER - TY - CPAPER T1 - ILC Marx Modulator Development Program Status T2 - 17th IEEE International Pulsed Power Conference (PPC 2009) AN - 40279719; 5235836 JF - 17th IEEE International Pulsed Power Conference (PPC 2009) AU - Burkhart, C AU - Beukers, T AU - Kemp, M AU - Larsen, R AU - Macken, K AU - Nguyen, M AU - Olsen, J AU - Tang, T Y1 - 2009/06/28/ PY - 2009 DA - 2009 Jun 28 KW - Development KW - U 7000:Multidisciplinary UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/40279719?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=17th+IEEE+International+Pulsed+Power+Conference+%28PPC+2009%29&rft.atitle=ILC+Marx+Modulator+Development+Program+Status&rft.au=Burkhart%2C+C%3BBeukers%2C+T%3BKemp%2C+M%3BLarsen%2C+R%3BMacken%2C+K%3BNguyen%2C+M%3BOlsen%2C+J%3BTang%2C+T&rft.aulast=Burkhart&rft.aufirst=C&rft.date=2009-06-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=17th+IEEE+International+Pulsed+Power+Conference+%28PPC+2009%29&rft.issn=&rft_id=info:doi/ L2 - http://ppc.missouri.edu/Abstracts.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-09-28 N1 - Last updated - 2010-05-03 ER - TY - JOUR T1 - Photoemission study of the reaction of Fe (sub 3) O (sub 4) (100) with water at near ambient conditions AN - 742848840; 2010-036505 JF - Geochimica et Cosmochimica Acta AU - Kendelewicz, T AU - Kaya, S AU - Newberg, J AU - Bluhm, H AU - Nilsson, A AU - Brown, G E, Jr AU - Pentcheva, Rossitza AU - Moritz, W AU - Anonymous Y1 - 2009/06// PY - 2009 DA - June 2009 SP - 1 PB - Elsevier, New York, NY VL - 73 IS - 13S SN - 0016-7037, 0016-7037 KW - hydroxyl ion KW - experimental studies KW - chemical reactions KW - oxides KW - mineral-water interface KW - spectra KW - X-ray photoelectron spectra KW - geochemistry KW - magnetite KW - 01C:Mineralogy of non-silicates KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/742848840?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Photoemission+study+of+the+reaction+of+Fe+%28sub+3%29+O+%28sub+4%29+%28100%29+with+water+at+near+ambient+conditions&rft.au=Kendelewicz%2C+T%3BKaya%2C+S%3BNewberg%2C+J%3BBluhm%2C+H%3BNilsson%2C+A%3BBrown%2C+G+E%2C+Jr%3BPentcheva%2C+Rossitza%3BMoritz%2C+W%3BAnonymous&rft.aulast=Kendelewicz&rft.aufirst=T&rft.date=2009-06-01&rft.volume=73&rft.issue=13S&rft.spage=A638&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/ L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Conference title - 19th annual V. M. Goldschmidt conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2010-01-01 N1 - PubXState - NY N1 - Last updated - 2012-06-07 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - chemical reactions; experimental studies; geochemistry; hydroxyl ion; magnetite; mineral-water interface; oxides; spectra; X-ray photoelectron spectra ER - TY - CPAPER T1 - In Situ GIXAFS Studies of a Pt-modified Rh(111) Electrode T2 - 215th Meeting of the Electrochemical Society AN - 42146823; 5157732 JF - 215th Meeting of the Electrochemical Society AU - Friebel, Daniel AU - Ogasawara, Hirohito AU - Anniyev, Toyli AU - Bargar, John AU - Nilsson, Anders Y1 - 2009/05/24/ PY - 2009 DA - 2009 May 24 KW - Electrodes KW - U 2000:Biological Sciences UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/42146823?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=215th+Meeting+of+the+Electrochemical+Society&rft.atitle=In+Situ+GIXAFS+Studies+of+a+Pt-modified+Rh%28111%29+Electrode&rft.au=Friebel%2C+Daniel%3BOgasawara%2C+Hirohito%3BAnniyev%2C+Toyli%3BBargar%2C+John%3BNilsson%2C+Anders&rft.aulast=Friebel&rft.aufirst=Daniel&rft.date=2009-05-24&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=215th+Meeting+of+the+Electrochemical+Society&rft.issn=&rft_id=info:doi/ L2 - http://ecsmeet7.peerx-press.org/jsp/mas/reportSymposiumList.jsp LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-09-28 N1 - Last updated - 2010-05-03 ER - TY - JOUR T1 - Structural Basis of Murein Peptide Specificity of a g-D-Glutamyl-L-Diamino Acid Endopeptidase AN - 21005346; 9302070 AB - The crystal structures of two homologous endopeptidases from cyanobacteria Anabaena variabilis and Nostoc punctiforme were determined at 1.05 and 1.60 A resolution, respectively, and contain a bacterial SH3-like domain (SH3b) and a ubiquitous cell-wall-associated NlpC/P60 (or CHAP) cysteine peptidase domain. The NlpC/P60 domain is a primitive, papain-like peptidase in the CA clan of cysteine peptidases with a Cys126/His176/His188 catalytic triad and a conserved catalytic core. We deduced from structure and sequence analysis, and then experimentally, that these two proteins act as g-D-glutamyl-L-diamino acid endopeptidases (EC 3.4.22.-). The active site is located near the interface between the SH3b and NlpC/P60 domains, where the SH3b domain may help define substrate specificity, instead of functioning as a targeting domain, so that only muropeptides with an N-terminal L-alanine can bind to the active site. JF - Structure AU - Xu, Qingping AU - Sudek, Sebastian AU - McMullan, Daniel AU - Miller, Mitchell D AU - Geierstanger, Bernhard AU - Jones, David H AU - Krishna, S Sri AU - Spraggon, Glen AU - Bursalay, Badry AU - Abdubek, Polat AU - Acosta, Claire AU - Ambing, Eileen AU - Astakhova, Tamara AU - Axelrod, Herbert L AU - Carlton, Dennis AU - Caruthers, Jonathan AU - Chiu, Hsiu-Ju AU - Clayton, Thomas AU - Deller, Marc C AU - Duan, Lian AU - Elias, Ylva AU - Elsliger, Marc-Andre AU - Feuerhelm, Julie AU - Grzechnik, Slawomir K AU - Hale, Joanna AU - Han, Gye Won AU - Haugen, Justin AU - Jaroszewski, Lukasz AU - Jin, Kevin K AU - Klock, Heath E AU - Knuth, Mark W AU - Kozbial, Piotr AU - Kumar, Abhinav AU - Marciano, David AU - Morse, Andrew T AU - Nigoghossian, Edward AU - Okach, Linda AU - Oommachen, Silvya AU - Paulsen, Jessica AU - Reyes, Ron AU - Rife, Christopher L AU - Trout, Christina V AU - van den Bedem, Henry AU - Weekes, Dana AU - White, Aprilfawn AU - Wolf, Guenter AU - Zubieta, Chloe AU - Hodgson, Keith O AU - Wooley, John AU - Deacon, Ashley M AU - Godzik, Adam AU - Lesley, Scott A AU - Wilson, Ian A AD - Joint Center for Structural Genomics, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA, wilson@scripps.edu Y1 - 2009/02// PY - 2009 DA - Feb 2009 SP - 303 EP - 313 PB - Cell Press, 1100 Massachusetts Avenue Cambridge MA 02138 USA, [mailto:subs@cell.com], [URL:http://www.cellpress.com] VL - 17 IS - 2 SN - 0969-2126, 0969-2126 KW - Microbiology Abstracts A: Industrial & Applied Microbiology; Microbiology Abstracts C: Algology, Mycology & Protozoology; Microbiology Abstracts B: Bacteriology KW - PROTEINS KW - Nostoc punctiforme KW - Cyanobacteria KW - Murein KW - L-Alanine KW - Cysteine KW - Crystal structure KW - Conserved sequence KW - Substrate specificity KW - Anabaena variabilis KW - peptidase KW - endopeptidase KW - K 03330:Biochemistry KW - A 01490:Miscellaneous KW - J 02330:Biochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/21005346?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Structure&rft.atitle=Structural+Basis+of+Murein+Peptide+Specificity+of+a+g-D-Glutamyl-L-Diamino+Acid+Endopeptidase&rft.au=Xu%2C+Qingping%3BSudek%2C+Sebastian%3BMcMullan%2C+Daniel%3BMiller%2C+Mitchell+D%3BGeierstanger%2C+Bernhard%3BJones%2C+David+H%3BKrishna%2C+S+Sri%3BSpraggon%2C+Glen%3BBursalay%2C+Badry%3BAbdubek%2C+Polat%3BAcosta%2C+Claire%3BAmbing%2C+Eileen%3BAstakhova%2C+Tamara%3BAxelrod%2C+Herbert+L%3BCarlton%2C+Dennis%3BCaruthers%2C+Jonathan%3BChiu%2C+Hsiu-Ju%3BClayton%2C+Thomas%3BDeller%2C+Marc+C%3BDuan%2C+Lian%3BElias%2C+Ylva%3BElsliger%2C+Marc-Andre%3BFeuerhelm%2C+Julie%3BGrzechnik%2C+Slawomir+K%3BHale%2C+Joanna%3BHan%2C+Gye+Won%3BHaugen%2C+Justin%3BJaroszewski%2C+Lukasz%3BJin%2C+Kevin+K%3BKlock%2C+Heath+E%3BKnuth%2C+Mark+W%3BKozbial%2C+Piotr%3BKumar%2C+Abhinav%3BMarciano%2C+David%3BMorse%2C+Andrew+T%3BNigoghossian%2C+Edward%3BOkach%2C+Linda%3BOommachen%2C+Silvya%3BPaulsen%2C+Jessica%3BReyes%2C+Ron%3BRife%2C+Christopher+L%3BTrout%2C+Christina+V%3Bvan+den+Bedem%2C+Henry%3BWeekes%2C+Dana%3BWhite%2C+Aprilfawn%3BWolf%2C+Guenter%3BZubieta%2C+Chloe%3BHodgson%2C+Keith+O%3BWooley%2C+John%3BDeacon%2C+Ashley+M%3BGodzik%2C+Adam%3BLesley%2C+Scott+A%3BWilson%2C+Ian+A&rft.aulast=Xu&rft.aufirst=Qingping&rft.date=2009-02-01&rft.volume=17&rft.issue=2&rft.spage=303&rft.isbn=&rft.btitle=&rft.title=Structure&rft.issn=09692126&rft_id=info:doi/10.1016%2Fj.str.2008.12.008 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-11-01 N1 - Last updated - 2015-03-30 N1 - SubjectsTermNotLitGenreText - Murein; L-Alanine; Cysteine; Crystal structure; Substrate specificity; Conserved sequence; peptidase; endopeptidase; Nostoc punctiforme; Cyanobacteria; Anabaena variabilis DO - http://dx.doi.org/10.1016/j.str.2008.12.008 ER - TY - JOUR T1 - Organizing a Research Community with SPIRES: Where Repositories, Scientists and Publishers Meet AN - 742902531; 201004296 AB - High Energy Physics (HEP) as a discipline has, for decades, embraced the preprint as a means of communicating results within the community. Community services such as SPIRES and arXiv.org have evolved to serve the needs of this community and enable the preprint communication model to be successful. Currently HEP researchers utilize preprints, not journals as their primary mode of communication, while journals are used to provide quality control via peer-review. SPIRES provided the infrastructure that allows researchers to blend the peer-review of journals with the speed of arXiv. Now a new project, INSPIRE, will provide an even more flexible and extensible system to allow publishers, repositories, and researchers themselves to contribute and share information. Adapted from the source document. JF - Information Services & Use AU - Brooks, Travis C AD - SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA travis@slac.stanford.edu Y1 - 2009///0, PY - 2009 DA - 0, 2009 SP - 91 EP - 96 PB - IOS Press, Amsterdam, The Netherlands VL - 29 IS - 2-3 SN - 0167-5265, 0167-5265 KW - Scholarly communication KW - Open access KW - Scholarly publishing KW - High energy physics KW - article KW - 10.01: ELECTRONIC PUBLICATION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/742902531?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Information+Services+%26+Use&rft.atitle=Organizing+a+Research+Community+with+SPIRES%3A+Where+Repositories%2C+Scientists+and+Publishers+Meet&rft.au=Brooks%2C+Travis+C&rft.aulast=Brooks&rft.aufirst=Travis&rft.date=2009-01-01&rft.volume=29&rft.issue=2-3&rft.spage=91&rft.isbn=&rft.btitle=&rft.title=Information+Services+%26+Use&rft.issn=01675265&rft_id=info:doi/ LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2010-05-10 N1 - Last updated - 2016-09-27 N1 - CODEN - ISUSDX N1 - SubjectsTermNotLitGenreText - Open access; Scholarly communication; Scholarly publishing; High energy physics ER - TY - CPAPER T1 - XAMPS Detector Readout ASIC for LCLS T2 - 2008 IEEE Nuclear Science Symposium and Medical Imaging Conference and 16th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors AN - 41119364; 4959380 JF - 2008 IEEE Nuclear Science Symposium and Medical Imaging Conference and 16th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors AU - Dragone, A AU - Pratte, J.-F. AU - Rehak, P AU - Carini, G A AU - Herbst, R AU - O'Connor, P AU - Siddons, D P Y1 - 2008/10/18/ PY - 2008 DA - 2008 Oct 18 KW - Sodium channels KW - Acidity KW - U 2000:Biological Sciences UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/41119364?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2008+IEEE+Nuclear+Science+Symposium+and+Medical+Imaging+Conference+and+16th+International+Workshop+on+Room-Temperature+Semiconductor+X-ray+and+Gamma-ray+Detectors&rft.atitle=XAMPS+Detector+Readout+ASIC+for+LCLS&rft.au=Dragone%2C+A%3BPratte%2C+J.-F.%3BRehak%2C+P%3BCarini%2C+G+A%3BHerbst%2C+R%3BO%27Connor%2C+P%3BSiddons%2C+D+P&rft.aulast=Dragone&rft.aufirst=A&rft.date=2008-10-18&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2008+IEEE+Nuclear+Science+Symposium+and+Medical+Imaging+Conference+and+16th+International+Workshop+on+Room-Temperature+Semiconductor+X-ray+and+Gamma-ray+Detectors&rft.issn=&rft_id=info:doi/ L2 - http://www.nss-mic.org/2008/Program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2009-05-05 N1 - Last updated - 2010-05-03 ER -