| 研究領域 | 水惑星学の創成 |
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| 研究課題/領域番号 |
20H04608
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| 研究種目 |
新学術領域研究(研究領域提案型)
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| 配分区分 | 補助金 |
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| 審査区分 |
理工系
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| 研究機関 | 東京工業大学 |
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研究代表者 |
Li Yamei 東京工業大学, 地球生命研究所, 特任助教 (10745128)
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| 研究期間 (年度) |
2020-04-01 – 2022-03-31
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| 研究課題ステータス |
完了 (2021年度)
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| 配分額 *注記 |
12,350千円 (直接経費: 9,500千円、間接経費: 2,850千円)
2021年度: 6,370千円 (直接経費: 4,900千円、間接経費: 1,470千円)
2020年度: 5,980千円 (直接経費: 4,600千円、間接経費: 1,380千円)
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| キーワード | Carbonaceous chondrite / Asteroid Ryugu / Aqueous alteration / Geo-electrochemistry / Amino acid decomposition / Mineral catalysis / Water-rock interaction / geoelectrochemistry / carbonaceous chondrites / chemical evolution / amino acid / Geoelectrochemistry / Carbonaceous chondrites / Amino acids / Catalysis / Amino acid |
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| 研究開始時の研究の概要 |
Amino acids are essential building blocks of life, and ubiquitously found in carbonaceous chondrites.Their genesis and conversion have important implications on the origin of biomolecules, and the geochemical processes occurred in their parent bodies (carbonaceous planetesimals).
I will investigate the conversion pathways of amino acids, for reaching a systematic understanding on the reaction pathways and kinetics of amino acid conversion. This will be used to evaluate the role of amino acids in chemical evolution and constrain the physico-chemical properties of the associated environments.
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| 研究実績の概要 |
I have explored the geochemical processes that shaped organic distributions on the parent icy planetesimals of carbonaceous chondrite. In the past year, I further extended the model to the parent body of carbonaceous asteroid Ryugu. These research results have resulted in one published paper (Nature Communications, 2022) and one manuscript currently under review (Li et al., under review). Our major finding is that aqueous alteration can lead to complex behavior of organics on its parent body, including both synthetic and breakdown mechanisms. If the parent planetesimal is water/rock differentiated, the redox gradients between the water-rich mantle and water-depleted core can drive the decomposition of dicarboxylic amino acids to n-w-amino acids even at low temperature (e.g., 25 oC).
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| 現在までの達成度 (段落) |
令和3年度が最終年度であるため、記入しない。
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| 今後の研究の推進方策 |
令和3年度が最終年度であるため、記入しない。
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