Search Results 1-20 of 578

  • Noble gases and deformation history of Finero phlogopite peridotite massif, northern Italy  [in Japanese]

    Fukushima Nanae , Sumino Hirochika , Kobayashi Masahiro , Ando Junichi , Kaushik DAS , Yamamoto Takafumi , Kagi Hiroyuki

    <p>イタリア北部Fineroの金雲母かんらん岩体は、古生代から中生代にかけてマントルウェッジでスラブ脱水による交代作用を受けている。マントル領域の水が変形特性に与える影響に着目した。この岩体が経験した水-岩石相互作用および変形履歴の解明のため、以下の2つの手法を用いた。(1)電子顕微鏡を用いた微細組織観察、(2)鉱物結晶中の流体/メルト包有物の希ガス分析による流体/メルトの起源の推定 …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 67(0), 118, 2020

    J-STAGE 

  • Mass independent isotopic fractionation of tin by solvent extraction  [in Japanese]

    Tanaka Kosuke , Ohno Takeshi , Hukami Yusuke

    <p>同位体効果には、分子内の振動エネルギーに起因する質量依存効果と、核体積効果などで生じる質量非依存効果が存在する。質量非依存効果では、奇数質量数の同位体が偶数質量数の同位体とは異なる挙動をするため、「Odd-Even変異」と呼ばれている。この効果と似た現象が隕石中の重元素でも発見され、宇宙化学の分野においても、核体積効果のメカニズムを解き明かすことは重要であると考えられる(Fuji …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 67(0), 111, 2020

    J-STAGE 

  • Theoretical study for uranium isotope fractionation caused by biotic reduction  [in Japanese]

    Abe Minori , Sato Ataru , Hada Masahiko

    <p>微生物によるウランの6価から4価への還元は、バイオレメディエーションや古生物学的観点から興味がもたれている。微生物による還元では、重い同位体がより多く4価の生成物に濃縮する一方、非生物による還元では同位体濃縮の傾向がさまざまである。本研究では、生物性還元の同位体分別メカニズムを解明するために、各素反応における相対論的ab initio法を用いた平衡論的同位体分別係数の理論計算を行 …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 67(0), 102, 2020

    J-STAGE 

  • Effect of crystal growth rates on boron isotopic fractionation during inorganic calcium carbonate precipitation  [in Japanese]

    Ogawa Ryuzo , ohno Takeshi , Fukami Yusuke , Suzuki Katsuhiko

    <p>間接的に過去の二酸化炭素濃度を推定する方法として海洋に存在する炭酸塩中の11B/10Bと海洋のpHの関係性を利用したホウ素同位体比指標が注目されている(Hemming and Hanson, 1992)。海水中のB(OH)4-とB(OH)3の存在比は海水のpHに依存しており、B-O間の結合が強いB(OH)3に重い同位体(11B)が濃縮することが知られている(Kakihana et …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 67(0), 105, 2020

    J-STAGE 

  • Mass Discrimination Effect in Isotope Ratio Measurement of Barium by Triple-Quadrupole Inductively Coupled Plasma-Mass Spectrometry: Estimation of Mass Bias Coefficient for Isotopic Analysis of Radioactive Cesium Nuclides  [in Japanese]

    SHIBAHARA Hiroki , YUKI Mami , OHISHI Yukiko , TAKEUCHI Yasutaka , YOSHIDA Zenko

    … <p>The mass discrimination effect in the isotope analyses of barium isotopes with natural abundance, from Ba-130 to Ba-138, was investigated by triple-quadrupole inductively coupled plasma-mass spectrometry (ICP-QQQ). … The effect of the addition of a collision-reaction cell (CRC) gas such as helium, hydrogen, nitrous oxide, or carbon dioxide on ε(<i>Ba</i>) was examined. …

    Transactions of the Atomic Energy Society of Japan 19(4), 211-219, 2020

    J-STAGE 

  • Nitrogen and Oxygen Isotope Signatures of Nitrogen Compounds during Anammox in the Laboratory and a Wastewater Treatment Plant

    Kotajima Shotoku , Fujitani Hirotsugu , Ushiki Norisuke , Tsuneda Satoshi , Yoh Muneoki , Koba Keisuke , Ikeda Daisuke , Terada Akihiko , Isaka Kazuichi , Nishina Kazuya , Kimura Yuuya , Makabe Akiko , Yano Midori

    … <p>Isotopic fractionation factors against <sup>15</sup>N and <sup>18</sup>O during anammox (anaerobic ammonia oxidization by nitrite) are critical for evaluating the importance of this process in natural environments. … We performed batch incubation experiments with an anammox-dominated biomass to investigate nitrogen (N) and oxygen (O) isotopic fractionation factors during anammox and also examined apparent isotope fractionation factors during anammox in an actual wastewater treatment plant. …

    Microbes and Environments 35(4), n/a, 2020

    J-STAGE 

  • Pressure Effect on Isotope Fractionation Factor  [in Japanese]

    SANO-FURUKAWA Asami , ITOH Shoichi , SUZUMURA Akimasa , UENO Yuichiro , YAGI Hikaru , INOUE Toru , KAWAZOE Takaaki

    … In interpreting their isotopic variations, the equilibrium isotope fractionation factor is a key because it depends on the environment parameters such as temperature. … Recent studies have shown that the effect of pressure on the isotope fractionation, which was considered negligible compared to temperature, is significant under the conditions of the Earth's interior. …

    The Review of High Pressure Science and Technology 30(2), 85-94, 2020

    J-STAGE 

  • Non-traditional isotope studies for earth metallomics  [in Japanese]

    Hirata Takafumi

    … <p>Continuous developments in inorganic mass spectrometry techniques, such as the combination of an ICP ion source and a magnetic sector-based mass spectrometer equipped with a multiple-collector array (MC-ICPMS), have revolutionized the precision of the isotopic ratio measurements, and the applications of the inorganic mass spectrometry in geochemistry, cosmochemistry, and biochemistry are beginning to appear over the horizon. …

    Chikyukagaku 54(3), 113-151, 2020

    J-STAGE 

  • 2-11 Hydrogen isotopic fractionation of hydrocarbons during the formation of mixed-gas hydrate  [in Japanese]

    KAMATA Ryoya , HACHIKUBO Akihiro , TAKEYA Satoshi

    … We suppose that the relation between the sizes of guest molecules and cage size of crystallographic structure affects the isotopic fractionation. … The effect of cage size on the isotopic fractionation can be checked using methane and propane mixed-gas hydrate. …

    Proceedings of the Annual Conference of The Japan Institute of Energy 29(0), 32-33, 2020

    J-STAGE 

  • Saroma-ko Lagoon Observations for sea ice Physico-chemistry and Ecosystems 2019 (SLOPE2019)  [in Japanese]

    NOMURA Daiki , YABE Itsuka S. , SON Eun Yae , VIVIER Frederic , LOURENCO Antonio , LEBRUN Marion , NOSAKA Yuichi , HIRAWAKE Toru , OOKI Atsushi , AOKI Shigeru , ELSE Brent , WONGPAN Pat , FRIPIAT Francois , INOUE Jun , VANCOPPENOLLE Martin , TOYOTA Takenobu , TANIKAWA Tomonori , KAWAGUCHI Yusuke , ONO Takashi , ISHINO Tomomi , TOZAWA Manami , TAMURA Tetsuya P.

    … Sea ice cores were collected to examine temperature, salinity, oxygen isotopic ratio, thin sections, and chemical and biological parameters such as carbonate chemistry, CH<sub>4</sub>, nutrients, chlorophyll <i>a</i> … Finally, an artificial pool was dug into the sea ice to understand the effect of snow particles on ice growth and to compare the gas exchange process over sea ice with an ice-free water surface. …

    Bulletin of Glaciological Research 38(0), 1-12, 2020

    J-STAGE 

  • Effect of pH and reaction rate on isotopic fractionation factor of strontium during calcium carbonate precipitation  [in Japanese]

    Shoich Sato , Masegi Ayaka , Ohno Takeshi , Fukami Yusuke

    <p>炭酸塩鉱物はどの時代にも地球表層環境に普遍的に存在し、元素・同位体組成が沈殿時の海洋環境を反映することから、海洋古環境情報復元のための試料として広く用いられている。近年、新たに環境情報を復元する指標として炭酸塩鉱物中の二族元素の同位体分別が注目されている。また、固相―液相間で同位体変動が起こる主な要因として、天然の炭酸カルシウムにおけるカルサイトとアラゴナイトといったような結晶系 …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 66(0), 231, 2019

    J-STAGE 

  • Effect of crystal growth rates on boron isotopic fractionation during calcium carbonate precipitation  [in Japanese]

    Ryuzo Ogawa , Takeshi Ohno , Yusuke Fukami , Katuhiko Suzuki

    <p>近年では間接的に過去の二酸化炭素濃度を推定する方法として海洋中に存在する炭酸塩中のホウ素同位体比が注目されている。海洋中のホウ酸イオンとホウ酸の存在度はpHに依存しており、ホウ酸イオンとホウ酸の存在比がホウ素同位体比に比例するため、pHの推定にホウ素同位体比を利用できる。無機的な沈殿実験からホウ素同位体比はpHと正の相関を示し、結晶成長速度と系統的な相関は示さないと述べられている …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 66(0), 230, 2019

    J-STAGE 

  • Eu isotope fractionation in the geological rocks  [in Japanese]

    Seung―Gu Lee , Tsuyoshi Tanaka

    <p>abstract</p>

    Abstracts of Annual Meeting of the Geochemical Society of Japan 66(0), 199, 2019

    J-STAGE 

  • Carbon, nitrogen, and sulfur stable isotopic reconstruction of human diet in a mountainous woodland village in Sendaiji in premodern Japan  [in Japanese]

    TSUTAYA TAKUMI , YONEDA MINORU , ABE MIKIKO , NAGAOKA TOMOHITO

    … No significant isotopic differences was found between individuals identified as Buddhists and those identified as Christians or between females and males. … The carbon isotope ratios in Sendaiji were the lowest among the studied premodern populations probably because these individuals consumed woodland foods that are affected by the canopy effect. …

    Anthropological Science 127(2), 131-138, 2019

    J-STAGE  Ichushi Web 

  • Effect of strontium on the growth, ion balance, and suberin induction in <i>Solanum lycopersicum</i>

    Nagata Takeshi

    … <p>Non-isotopic strontium (Sr) is a non-essential element found in the environment but its effect on plants is unknown. … The effect of high Sr concentration on vegetative plants has not been investigated. … Here, the effect of Sr on the growth of <i>Solanum lycopersicum</i> …

    Plant Root 13(0), 9-14, 2019

    J-STAGE 

  • Hydrogen isotopic composition of <i>n</i>-alkanes in sediments from freshwater Fuxian Lake in subtropical, China: Implications for the ecological environment

    Duan Yi , Wu Yingzhong , Yao Jingli , He Jinxian , Zhang Xiaoli , Xu Li , Ma Lanhua

    … <p>The normal alkanes (<i>n</i>-alkanes) and their hydrogen isotopic (<i>δ</i>D) values in sediments and aquatic and terrestrial plants from Fuxian Lake area of China were analyzed by gas chromatography-mass spectrometry (GC-MS) and GC-isotope ratio mass spectrometry (GC-IRMS), respectively. … The type I samples had a heavier hydrogen isotopic composition (–161 to –155‰ on average) compared to that of the type II samples (–208 to –173‰ on average). …

    GEOCHEMICAL JOURNAL 53(3), 181-193, 2019

    J-STAGE 

  • Stability of the Drift-Cyclotron Loss-Cone and Double-Humped Modes in Multispecies Plasmas

    KOTELNIKOV Igor A. , CHERNOSHTANOV Ivan S. , PRIKHODKO Vadim V.

    … The isotopic effect is taken into account as well as the anisotropy of warm ions used to stabilise these modes.</p> …

    Plasma and Fusion Research 14(0), 2403001-2403001, 2019

    J-STAGE 

  • Spatial Variations in the Stable Isotopic Compositions of Surface and Groundwaters across Central Sri Lanka

    TSUCHIHARA Takeo , YOSHIMOTO Shuhei , SHIRAHATA Katsushi , ISHIDA Satoshi , MINAKAWA Hiroki , MIYAZU Susumu

    … <p>We present the spatial variations and isotopic fractionations of the stable isotopic compositions of waters across central Sri Lanka and discuss their applicability as tracers in hydrological studies of the island. … The stable isotopic compositions of lake waters in the dry zone of the island were affected by evaporative isotopic enrichment and therefore can be used to estimate the evaporative loss from these lakes. …

    Japan Agricultural Research Quarterly: JARQ 53(1), 21-30, 2019

    J-STAGE 

  • A simple role of coral-algal symbiosis in coral calcification based on multiple geochemical tracers

    Inoue Mayuri , Nakamura Takashi , Tanaka Yasuaki , Suzuki Atsushi , Yokoyama Yusuke , Kawahata Hodaka , Sakai Kazuhiko , Gussone Nikolaus

    … Here, based on the skeletal chemical and isotopic compositions of symbiotic and asymbiotic primary polyps of Acropora digitifera corals, we show a simple pH increase in the calcification medium as the predominant contribution of symbionts to calcification of host corals. …

    Geochimica et Cosmochimica Acta (235), 76-88, 2018-08-15

    IR 

  • Contrasting effects of functionally distinct tadpole species on nutrient cycling and litter breakdown in a tropical rainforest stream

    Ramamonjisoa Noelikanto , Natuhara Yosihiro

    ファイル公開:2019-02-01

    Freshwater Biology 63(2), 202-213, 2018-02

    IR 

Page Top