Potential for Aerobic Methanotrophic Metabolism on Mars
Potential for Aerobic Methanotrophic Metabolism on Mars
复制标题
火星上有氧甲烷氧化代谢的潜力
DOI:
10.1089/ast.2018.1943
复制
发表时间:
2019
期刊:
影响因子:
4.2
通讯作者:
Cappellen Philippe Van
中科院分区:
文献类型:
--
作者:
Seto Mayumi;Noguchi Katsuyuki;Cappellen Philippe Van
Observational evidence supports the presence of methane (CH4) in the martian atmosphere on the order of parts per billion by volume (ppbv). Here, we assess whether aerobic methanotrophy is a potentially viable metabolism in the martian upper regolith, by calculating metabolic energy gain rates under assumed conditions of martian surface temperature, pressure, and atmospheric composition. Using kinetic parameters for 19 terrestrial aerobic methanotrophic strains, we show that even under the imposed low temperature and pressure extremes (180–280 K and 6–11 hPa), methane oxidation by oxygen (O2) should in principle be able to generate the minimum energy production rate required to support endogenous metabolism (i.e., cellular maintenance). Our results further indicate that the corresponding metabolic activity would be extremely low, with cell doubling times in excess of 4000 Earth years at the present-day ppbv-level CH4mixing ratios in the atmosphere of Mars. Thus, while aerobic methanotrophic microorganisms similar to those found on Earth could theoretically maintain their vital functions, they are unlikely to constitute prolific members of hypothetical martian soil communities.
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DOI:
10.1073/pnas.0507601102
发表时间:
2005
影响因子:
11.1
作者:
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影响因子:
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发表时间:
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期刊:
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影响因子:
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影响因子:
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作者:
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影响因子:
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作者:
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