Revised May 2020, hrt1

私たちの研究グループでは、隕石や地球の岩石に含まれる超微量元素の同位体情報を用いて、太陽系形成初期の惑星形成過程や地球表層環境と生命の共進化を調べています。最近では、実用化した分析手法を生命分野に応用し、細胞試料の微量元素分析を通じて生体金属の代謝機構や微量元素の生体機能への役割を調べています。生命体を含めた全地球規模での元素循環を通じて、地球の誕生から生命の進化までを包括的に扱う「地球メタロミクス」を推進する、これが私達の研究グループのテーマです。以下の3つが現時点での重点研究課題です。

UTokyo

Publications

iQuant2 software is free of charge : contact Tak Hirata for further information.

・日本地球惑星科学連合大会(5月、JpGU)

・日本質量分析学会討論会(5月、大阪)

・日本分析化学討論会(5月、北海道)

・第26回ICPMSセミナー(東大)

・日本地球化学会年会(9月、弘前)

・日本分析化学会(9月、名古屋)

・第7回レーザーアブレーションワークショップ(11月、幕張)

・日本質量分析学会同位体比部会(11月、広島)

・プラズマ分光分析研究会筑波セミナー(11月、東京)

iQuant2+

will launch shortly (August, 2018 launching)

研究発表賞

元素イメージング分析用のソフトウエアを開発しました。ICPMSによるイメージングおよび様々な解析に応用できます(論文が質量分析学会誌に受理されました:Suzuki et al., 2018)。8月には、イメージングを立体視(鳥瞰図)として可視化できる新バージョン(iQuant2+)と、ナノパーティクルのイメージングに対応したiQuantNPをリリースしました。

Seminar / Presentation 2020

Software

白の点がナノ粒子1個に対応します

溶存成分の分布も分かります

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.  The analytical community is actively solving problems, such as spectral interferences, correction of mass bias effect, high-yield chemical separation and purification processes, or reduction of the contamination of analytes.  With the state-of-art techniques developed in the past decade, isotope ratio data of the elements are not specially for geochemical or cosmochemical studies.

The Core Competence in Inorganic Mass Spectrometry

Natural variations in isotopic ratios of the heavy elements can provide new insights into the past and present of various geochemical and biochemical processes.  Stable isotope tracers are now increasingly being used in studies of elemental metabolism, bioavailability or toxicity of nutrients, as well as evaluating the elemental turnover time.  The metabolism of higher organisms can be transcribed as stable supply of the most essential elements through transfer, absorption, and storing processes, which form the basis of homeostasis function.  Variations in the isotopic composition of the elements induced through dietary or metabolism processes have potential to become novel biochemical markers for assessing impairments in metal metabolism or nutritional status of the elements.

We are still struggling to create new research fields in the stable isotope geochemistry through instrumental developments using the inorganic mass spectrometer, covering the isotopic analysis of nanoparticles in meteorites, high-speed 3D imaging analysis of biological tissue samples, as well as merging of metallomics with traditional -omics studies.  Our goal is realise the words by Walter Bagehot that “The great pleasure in life is doing what people say you cannot do”.

Shuji Matsu’ura, Megumi Kondo, Tohru Danhara, Shuhei Sakata, Hideki Iwano, Takafumi Hirata, Iwan Kurniawan, Erick Setiyabudi, Yoshihiro Takeshita, Masayuki Hyodo, Ikuko Kitaba, Masafumi Sudo, Yugo Danhara, Fachroel Aziz (2020) Age control of the first appearance datum for Javanese Homo erectus in the Sangiran area, Science, 367, 210–214.

平田が地球化学会賞を受賞しました。

Outline of the Research

Anastasia Tamarova, Ekaterina Marchenko, Andrey Bobrov, Nikolay Eremin, Nina Zinov’eva, Tetsuo Irifune, Takafumi Hirata, Yoshiki Makino (2020) Interphase REE Partitioning at the Boundary between the Earth’s Transition Zone and Lower Mantle: Evidence from Experiments and Atomistic Modeling, accepted in Crystallography and Physical Chemistry of Minerals.


Takafumi Hirata, Shuji Yamashita, Mirai Ishida, Toshihiro Suzuki (2019) Isotopic analysis of Os from Ir-Os bearing nanoparticles using high-time resolution-multiple collector-ICPMS system, submitted to MSSJ, in press.


Yutaka Takahashi et al. (2020) Zircon U-Pb ages of metamorphic rocks in the upper sequence of the Hidaka metamorphic belt, northern Japan: Implications for two times of metamorphism of the Hidaka metamorphic belt, accepted in Journal of Asian Earth Sciences.


Hideki Iwano, Tohru Danhara, Toru Nakajima, Harutaka Sakai, Yugo Danhara, Saori Hirabayashi, Takafumi Hirata (2020) Zircon fission-track and U–Pb double dating using femtosecond laser ablation–inductively coupled plasma–mass spectrometry: A technical note, Island Arc. 2020;29:e12348. https://doi.org/10.1111/iar.12348.

2020