To develop geochemical tracers of hydrogen and carbon isotope systematics by methanogen incubations
| Project/Area Number |
25701004
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
KAWAGUCCI Shinsuke 国立研究開発法人海洋研究開発機構, 深海・地殻内生物圏研究分野, 研究員 (50553088)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
Fiscal Year 2015: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2013: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Keywords | メタン / 安定同位体 / 炭素同位体比 / 水素同位体比 / 生命の限界 |
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| Outline of Final Research Achievements |
1. The hydrogen isotope ratio of CH4 produced by a thermophilic methanogen, Mtc. okinawensis, under high pH2 conditions (~105 Pa-H2) is affected by the isotope ratio of H2, as pointed out in a previous incubation. This pattern is named as the δDH2 effect. This effect also appears to account for the diverse hydrogen isotope fractionation between CH4 and H2O previously observed in H2-enriched culture incubations.
2. The hydrogen isotope fractionation between CH4 and H2O in hydrogenotrophic methanogenesis under low pH2 conditions (<102 Pa) observed in experiments is in the range of 0.66-0.74.
3. Hydrogen isotope fractionation exhibited in laboratory incubations under low-pH2 conditions is consistent with that observed in “young” methane reservoirs but inconsistent with that observed in “aged” methane reservoirs.
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Report
(4 results)
Research Products
(3 results)
