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Raman spectroscopic study of silicon Nanopowders

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Journal of materials science & Technology 1997年第4期13卷 327-332页

作者： s.m.scholz J.Dutta and h.h.fmann(Lab. de Technologie des Poudres, Departement de materiaux, Ecole Polytechnique Federale de Lausanne,1015 Lausanne, switzerland)h.hofmeister (max-Planck-Institut fur mikrostrukturphysik, Weinberg 2, D-06120 halle, Germany) Lab. de Téchnologie Des Poudres Département de Matériaux Ecole Polytechnique Fédérale de Lausanne 1015 Lausanne Switzerland max-Planck-Institut Für mikrostrukturphysik Weinberg 2 D-06120 Halle Germany

Vibrational properties of silicon nanopowders are discussed with reference to Raman spectroscopic measurements. The powders were produced in a low pressure rf plasma from the cluster induced agglomeration of positive ions formed during the dissociation of silane. Influence of thermal treatment and the crystallization phenomena of the powder were studied. Raman spectroscopic measurements reveal size quantization effects for the particles as well as the existence of partially ordered regions in the apparently amorphous primary particles. The crystalline and amorphous volume fraction in the material were calculated from the relative spectraI intensities. The results obtained in these experiments are consistent with the observations from recent high resolution transmission electron microscopy studies of these powders

关键词： hRTEm cm nm Raman spectroscopic study of silicon Nanopowders

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Oxidized organic molecules in the tropical free troposphere over Amazonia

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National science Review 2024年第1期11卷 174-184页

作者： Qiaozhi Zha Diego Aliaga Radovan Krejci Victoria A.sinclair Cheng Wu Giancarlo Ciarelli Wiebke scholz Liine heikkinen Eva Partoll Yvette Gramlich Wei huang markus Leiminger Joonas Enroth Otso Per?kyl? Runlong Cai Xuemeng Chen Alkuin maximilian Koenig Fernando Velarde Isabel moreno Tuukka Pet?j? Paulo Artaxo Paolo Laj Armin hansel s.m.ra Carbone markku Kulmala marcos Andrade Douglas Worsnop Claudia mohr Federico Bianchi Institute for Atmospheric and Earth system Research/Physics University of Helsinki Joint International Research Laboratory of Atmospheric and Earth system sciences Nanjing University Department of Environmental science & Bolin Centre for Climate Research Stockholm University Department of Chemistry and molecular Biology University of Gothenburg Institute for Ion and Applied Physics University of Innsbruck Ionicon Analytik Gmbh Laboratory for Atmospheric Physics Institute for Physics Research Universidad Mayor de San Andrés Institute of Physics University of Sao Paulo Institute for Geosciences and Environmental Research (IGE) University of Grenoble Alpes Agrarian sciences Institute Federal University of Uberl?ndia Beijing Advanced Innovation Center for soft matter science and Engineering Beijing University of Chemical Technology Department of Atmospheric and Oceanic sciences University of Maryland Aerodyne Research Inc. Department of Environmental system science ETH Zürich switzerland and Laboratory of Atmospheric Chemistry Paul Scherrer Institute

New particle formation(NPF) in the tropical free troposphere(FT) is a globally important source of cloud condensation nuclei, affecting cloud properties and climate. Oxidized organic molecules(OOms)produced from biogenic volatile organic compounds are believed to contribute to aerosol formation in the tropical FT, but without direct chemical observations. We performed in situ molecular-level OOms.m.asurements at the Bolivian station Chacaltaya at 5240 m above sea level, on the western edge of Amazonia. For the first time, we demonstrate the presence of OOms, mainly with 4–5 carbon atoms, in both gas-phase and particle-phase(in terms of mass contribution) measurements in tropical FT air from Amazonia. These observations, combined with air mass history analyses, indicate that the observed OOms are linked to isoprene emitted from the rainforests hundreds of kilometers away. Based on particle-phase measurements, we find that these compounds can contribute to NPF, at least the growth of newly formed nanoparticles, in the tropical FT on a continental scale. Thus, our study is a fundamental and significant step in understanding the aerosol formation process in the tropical FT.

关键词： oxidized organic molecules tropical aerosol formation Amazon free troposphere

The GYF domain protein CD2BP2 is critical for embryogenesis and podocyte function

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分子细胞生物学报:英文版 2015年第5期7卷 402-414页

作者： Gesa I.Albert Christoph schell Karin m.Kirschner sebastian schafer Ronald Naumann Alexandra muller Oliver Kretz Benno Kuropka mathias Girbig Norbert hubner Eberhard Krause holger scholz Tobias B.huber Klaus-Peter Knobeloch Christian Freund Institute for Chemistry and Biochemistry Freie Universitat Berlin14195 BerlinGermany Leibniz-Institut fuer molekulare Pharmakologie 13125 BerlinGermany Renal Division University Hospital Freiburg79106 FreiburgGermany speman Graduate school for medicine and Biology University of Freiburg79106 FreiburgGermany Faculty of Biology University Freiburg79106 FreiburgGermany Institute fuer Vegetative Physiologie Charité-Universitatsmedizin Berlin10117 BerlinGermany Experimental Genetics and Cardiovascular Diseases MDC13125 BerlinGermany Transgenic Core Facility Max-Planck-Institute of Molecular Cell Biology and GeneticsDresdenGermany Institute of Neuropathology University of Freiburg79106 FreiburgGermany Institute of Cell Biology&Anatomy University of Freiburg79106 FreiburgGermany BIOss Centre for Biological signaling studies Albert-Ludwigs-University79106 FreiburgGermany

scaffolding proteins play pivotal roles in the ass.m.ly of macromolecular machines such as the *** adaptor protein CD2BP2,originally identified as a binding partner of the adhesion molecule CD2,is a pre-spliceos.m.l ass.m.ly factor that utilizes its glycine-tyrosine-phenylalanine(GYF)domain to co-localize with spliceos.m.l *** far,its function in vertebrates is *** conditional gene targeting in mice,we show that CD2BP2 is crucial for embryogenesis,leading to growth retardation,defects in vascularization,and premature death at embryonic day 10.5 when *** of the protein in bone marrow-derived macrophages indicates that CD2BP2 is involved in the alternative splicing of mRNA transcripts from diverse *** the molecular level,we identified the phosphatase PP1 to be recruited to the spliceos.m. via the N-terminus of *** the strong expression of CD2BP2 in podocytes of the kidney,we use selective depletion of CD2BP2,in combination with next-generation sequencing,to monitor changes in exon usage of genes critical for podocyte functions,including VEGF and actin ***2BP2-depleted podocytes display foot process effacement,and cause proteinuria and ultimately lethal kidney failure in ***,our study defines CD2BP2 as a non-redundant splicing factor essential for embryonic development and podocyte integrity.

关键词： GYF domain CD2BP2 alternative splicing PP1 podocytes VEGF

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论地震断层的标度律

世界地震译丛 2001年第2期32卷 73-83页

作者： J-h. Wang s-s. Ou 姚雪绒中国地震局地球物理研究所

主要使用Wells和Coppersmith(1994)汇编的震源参数数据库,研究了地震断层的地震矩m_0、平均位移δ、破裂宽度W和破裂长度L之间的标度关系。结果表明:地震矩m_0与破裂长度L的关系大致为:m_0～L^2;大地震的破裂长度与破裂宽度无关;平均位... 详细信息

主要使用Wells和Coppersmith(1994)汇编的震源参数数据库,研究了地震断层的地震矩m_0、平均位移δ、破裂宽度W和破裂长度L之间的标度关系。结果表明:地震矩m_0与破裂长度L的关系大致为:m_0～L^2;大地震的破裂长度与破裂宽度无关;平均位移δ与破裂长度L的关系大致为:δ～L;平均位移与破裂宽度无关。因此,scholz(1982)提出的乙模型比Romanowicz(1992)提出的W模型更适合于描述地震断层的标度律。

关键词：地震断层标度律震源参数最小二乘法 L模型

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mobilizing Crop Biodiversity

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molecular Plant 2020年第10期13卷 1341-1344页

作者： susan mcCouch Zahra Katy Navabi michael Abberton Noelle L.Anglin Rosa Lia Barbieri michael Baum Kirstin Bett helen Booker Gerald L.Brown Glenn J.Bryan Luigi Cattivelli David Charest Kellye Eversole marcelo Freitas Kioumars Ghamkhar Dario Grattipaglia Robert henry maria Cleria Valadares Inglis Tofazzal Islam Zakaria Kehel Paul J.Kersey Graham J.King stephen Kresovich Emily marden sean mayes.m.rie Noelle Ndjiondjiop henry T.Nguyen s.m.el Rezende Paiva Roberto Papa Peter W.B.Phillips Awais Rasheed Christopher Richards.m.thieu Flouard maria Jose Amstalden s.m.aio Uwe scholz Paul D.shaw Brad sherman s.Evan staton Nils stein Jan svensson mark Tester Jose Francisco montenegro Valls Rajeev Varshney stephen Visscher Eric von Wettberg Robbie Waugh Peter Wenzl Loren h.Rieseberg Plant Breeding and Genetics School of Integrated Plant SciencesCornell UniversityIthacaNY14853USA Divseek Global Institute for Food Security110 Gymnasium PlaceUniversity of SaskatchewanSaskatoonSKS7N 0W9Canada lnternational Institute of Tropical Agriculture(IITA) PMB 5320Oyo RdIbadanNigeria International Potato Center(CIP)1895 Avenida La molina Lima Peru 12Lima 15023Peru Embrapa Genetic Resources and Biotechnology Parque Estacjao BiologicaFinal Av W5 NorteCaixa Postal 0237270770-917-Brasilia DFBrazil International Center for Agricultural Research in the Dry Areas(I CAR DA) Station Exp.INRA-Quich.Rue Hafiane Cherkaoui.Agdal.Rabat-Instituts10111RabatMorocco Department of Plant sciences University of Saskatchewan51 Campus Dr.SaskatoonSK S7N 5A8Canada Department of Plant Agriculture University of GuelphRm 316Crop Science Bldg50 Stone Rd EGuelphON N1G 2W1Canada Genome Prairie 111 Research DriveSuite 101SaskatoonSKS7N 3R2Canada The James hutt on Institute Errol RoadInvergowrieDundeeDD25DAUK CREA Research Centre for Genomics and Bioinformaticsvia San Protaso 302Fiorenzuola d'Arda29017Italy Genome British Columbia 400-575 West 8th AvenueVancouverBCV5Z 0C4Canada International Wheat Genome sequencing Consortium 2841 NE Marywood CtLee's SummitMO.64086USA Forage science Grasslands Research CentreAgResearchPalmerston North4410New Zealand Queensla nd Alliance for Agriculture and Food Inn ovation University of QueenslandBrisbaneQLD 4072Australia Institute of Biotechnology and Genetic Engineering(IBGE) Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur 1706Bangladesh southern Cross University PO Box 157LismoreNSW 2480Australia Royal Botanic Gardens KewRichmondSurreyTW93AEUK Feed the Future Innovation Lab for Crop Improvement 431 Weill HallCornell UniversityIthacaNY14853USA Department of Botany and Biodiversity Research Centre University of British ColumbiaVancouverBC V6R 2A5Canada Crops For the Future(UK)CIC 76-80 Baddow Road ChelmsfordEs

Over the past 70 years,the world has witnessed extraordinary growth in crop productivity,enabled by a suite of technological advances,including higher yielding crop varieties,improved farm management,synthetic agrochemicals,and agricultural *** this"Green Revolution"intensified crop production,and is credited with reducing famine and malnutrition,its benefits were accompanied by several undesirable collateral effects(Pingali,2012).These include a narrowing of agricultural biodiversity,stemming from increased monoculture and greater reliance on a smaller number of crops and crop varieties for the majority of our *** reduction in diversity has created vulnerabilities to pest and disease epidemics,climate variation,and ultimately to human health(harlan,1972).

关键词： intensified crops agricultural