Search Results:　 1-20 of 9812

1

Time-Resolved Photoresponse Measurements of the Electrical Conductivity of the Quasi-Two-Dimensional Organic Superconductor β-(BEDT-TTF)2I3 Using a Nanosecond Laser Pulse

Iimori Toshifumi , Sabeth Farzana , Naito Toshio , Ohta Nobuhiro

… A possible mechanism explaining the photoresponse of the conductivity is discussed, based on the isotope effect on the photoresponse. …

Journal of Physical Chemistry C 115(48), 23998-24003, 2011-12-08

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2

New organic reference materials for carbon- and nitrogen-stable isotope ratio measurements provided by Center for Ecological Research, Kyoto University, and Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology

Tayasu Ichiro , Hirasawa Riyo , Ogawa Nanako O. , Ohkouchi Naohiko , Yamada Keita

… We determined both carbon and nitrogen isotope ratios of ten organic reference materials (CERKU-01 to CERKU-10) in the Center for Ecological Research (CER), Kyoto University, and three organic reference materials (BG-A, BG-P, and BG-T) in the Institute of Biogeosciences (BioGeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), using an internationally recommended calibration method of two-point anchoring. …

Limnology 12(3), 261-266, 2011-12

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3

The origin of Zn isotope fractionation in sulfides

Fujii Toshiyuki , Moynier Frédéric , Pons Marie-Laure , Albarède Francis

… Isotope fractionation of Zn between aqueous sulfide, chloride, and carbonate species (Zn[2+], Zn(HS)_2, Zn(HS)_4[2-], ZnHCO_3[+], ZnS(HS)[−] ZnCl[+] , ZnCl_2,Pco_2, and ZnCO_3) was investigated using ab initio methods. … 3 and under atmospheric-like CO_2 pressures, isotope fractionation of Zn sulfides precipitated from sulfidic solutions is affected by aqueous sulfide species and the δ[66]Zn of sulfides reflect these in the parent solutions. …

Geochimica et Cosmochimica Acta 75(23), 7632-7643, 2011-12

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4

Springtime carbon emission episodes at the Gosan background site revealed by total carbon, stable carbon isotopic composition, and thermal characteristics of carbonaceous particles

Jung J. , Kawamura K.

… Based on a carbon isotope mass balance equation, we found that ∼42 % of TC in the TSP samples during the pollen episodes was attributed to airborne pollen from Japanese cedar trees planted around tangerine farms in Jeju Island. …

Atmospheric Chemistry and Physics 11(21), 10911-10928, 2011-11-03

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5

Kinetic asymmetry of subunit exchange of homooligomeric protein as revealed by deuteration-assisted small-angle neutron scattering.

Sugiyama Masaaki , Kurimoto Eiji , Yagi Hirokazu , Mori Kazuhiro , Fukunaga Toshiharu , Hirai Mitsuhiro , Zaccai Giuseppe , Kato Koichi

… After mixing these solutions, the isotope sensitive SANS intensity in the low-q region gradually decreased, indicating subunit exchange, whereas the small-angle x-ray scattering profile remained unchanged confirming the structural integrity of the tetradecamer particles during the exchange. …

Biophysical journal 101(8), 2037-2042, 2011-10-19

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6

Dolomite sample measurements using MAT-250 mass-spectrometer at Shizuoka University [in Japanese]

Tsuboi Tatsuya , Kashiwagi Asami , Utsunomiya Masayuki , Wada Hideki , Satish-Kumar M. , Niitsuma Nobuaki

Geoscience reports of Shizuoka University 38, 33-46, 2011-10

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7

Carbon and oxygen isotope measurement of carbonate molecule in spurrite [Ca_5Si_2O_8(CO_3)]

Satish-Kumar M. , Yoshida Yasuhito , Wada Hideki

Geoscience reports of Shizuoka University 38, 27-32, 2011-10

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8

Stable isotopic compositions of organic compounds in carbonaceous chondrites and their fractionation processes [in Japanese]

Oba Yasuhiro

… In this paper, I will review the previous laboratory experiments as to isotope fractionation of organic compounds in extraterrestrial environments such as molecular clouds and meteorite parent bodies. …

Researches in organic geochemistry 27, 103-115, 2011-09-30

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9

Carbon isotope composition of bishomohopanoic acid in Miocene to recent marine sediments from the Nankai Trough (ODP Leg 190, Site 1178)(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II))

Saito Hiroyuki , Suzuki Noriyuki

… The distribution and carbon isotope composition of 17β(H), 21β(H)-bishomohopanoic acid (ββC_<32>-HA) were investigated in Miocene to recent marine sediments from Site 1178 of ODP Leg 190, Nankai Trough, offshore Shikoku, Japan. …

Researches in organic geochemistry 27, 97-102, 2011-09-30

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10

Methyl and ethyl chloroformate derivatizations for compound-specific stable isotope analysis (CSIA) of fatty acids(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II))

Goto Akiko S. , Korenaga Takashi , Chikaraishi Yoshito

… We evaluated methyl (MCF) and ethyl chloroformate (ECF) derivatizations as rapid and simple esterification techniques for the compound-specific stable isotope analysis (CSIA) of fatty acids. … In this esterification process, the accuracy of the carbon isotope (δ^<13>C) measurements was always better than 0.3‰. …

Researches in organic geochemistry 27, 91-95, 2011-09-30

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11

Stable hydrogen isotope ratios of n-alkanes in atmospheric aerosols from Okinawa, Japan(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II))

Yamamoto Shinya , Kawamura Kimitaka

… Molecular compositions of n-alkanes and their stable hydrogen isotope ratios (δD) were studied in atmospheric aerosols collected from Cape Hedo, Okinawa, Japan, to better understand the long-range atmospheric transport of organic aerosols from the Asian continent. …

Researches in organic geochemistry 27, 81-89, 2011-09-30

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12

Ecological application of compound-specific stable nitrogen isotope analysis of amino acids : A case study of captive and wild bears(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II))

Nakashita Rumiko , Suzuki Yaeko , Akamatsu Fumikazu , Naito Yuichi I. , Sato-Hashimoto Miho , Tsubota Toshio

… Several recent studies have suggested an innovative method for estimating the food sources, feeding habits, and trophic position of consumers in food webs, based on the compound-specific stable isotope analysis (CSIA) of amino acids. …

Researches in organic geochemistry 27, 73-79, 2011-09-30

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13

Carbon and hydrogen isotopic compositions of prokaryotic lipid biomarkers(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II)) [in Japanese]

Kaneko Masanori , Naraoka Hiroshi

… This review describes carbon and hydrogen isotope fractionation associated with variety of metabolic and lipid synthetic pathways, factors controlling the isotope fractionation, and their applications into natural environments. …

Researches in organic geochemistry 27, 55-72, 2011-09-30

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14

Measurement of intramolecular carbon isotope distributions in biosynthetic products and its implications for organic geochemistry(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II)) [in Japanese]

Yamada Keita

… Glucose is one of the most important starting materials for biosynthetic products and its intramolecular carbon isotope distribution is essential information to understand carbon isotopic composition of biosynthetic products. … Characteristics of intramolecular carbon isotope distribution in glucose from plant material and ethanol fermented from glucose are reviewed. … At the moment the characteristic of intramolecular carbon isotope distribution in glucose have not been generalized. …

Researches in organic geochemistry 27, 45-54, 2011-09-30

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15

Stable isotopic study meets Astrobiology - Methane on Mars(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II)) [in Japanese]

Yabuta Hikaru

… Compound-specific stable carbon isotope analysis will be a potential tool for addressing this most intriguing question. … NASA's Mars Science Laboratory (MSL), which will launch in autumn 2011, loads a Tunable Laser Spectrometer (TLS) into the Sample Analysis at Mars (SAM) instrument to conduct in-situ stable isotope analyses of volatile compounds and organic molecules on Mars with high precision and accuracy. …

Researches in organic geochemistry 27, 33-43, 2011-09-30

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16

Stable carbon isotopic compositions of cholesterol in fossil bone of marine mammal for palaeodietary study(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II)) [in Japanese]

Shinmura Tatsuya , Sawada Ken

… Dietary preferences of archaeological and paleontological animals have been conventionally investigated by stable carbon isotope ratio (δ^<13>C) of collagen and tooth enamel in the fossil remains. … Therefore, the carbon isotope ratio of cholesterol (including its diagenetic products) in bones has been recently applied as alternative approach for reconstructing palaeodietary of animals. …

Researches in organic geochemistry 27, 23-32, 2011-09-30

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17

Application of compound specific stable carbon and hydrogen isotope ratios for paleoclimate study(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II)) [in Japanese]

Seki Osamu

… Recently developed techniques for measuring compound-specific hydrogen isotope compositions of alkyl lipids has potential as a proxy of temperature, precipitation, relative humidity and hydrological cycles of the past. …

Researches in organic geochemistry 27, 13-21, 2011-09-30

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18

Food chain analysis by nitrogen isotopic composition of amino acids : Application to terrestrial environments(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II)) [in Japanese]

Chikaraishi Yoshito , Takano Yoshinori , Ogawa Nanako O. , Sasaki Yoko , Tsuchiya Masashi , Ohkouchi Naohiko

… Recent evidences have suggested that compound-specific stable isotope analysis (CSIA) of amino acids has been employed as a new powerful method with that enables the estimation of trophic level of organisms in not only aquatic but also terrestrial food webs. …

Researches in organic geochemistry 27, 3-11, 2011-09-30

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19

Preface to "Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II)"(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II)) [in Japanese]

Chikaraishi Yoshito , Oba Yasuhiro

Researches in organic geochemistry 27, 1, 2011-09-30

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20

Natural isotopic variation of heavy elements by multiple-collector mass spectrometry(The Geochemical Society of Japan Award for Young Researcher) [in Japanese]

TANIMIZU Masaharu

… Precise isotope ratios of most polyisotopic heavy elements can be now determined by ICP (inductively coupled plasma) mass spectrometry with a multiple collector array (MC-ICP-MS), because elements with high ionization potential energy are easily ionized to positive ions using the high ionization efficiency of Ar ICP. …

地球化学 45(3), 129-145, 2011-09-05

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Search Results:　 1-20 of 9812