The contribution of water radiolysis to marine sedimentary life.
The contribution of water radiolysis to marine sedimentary life.
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DOI：
10.1038/s41467-021-21218-z
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发表时间：
2021-02-26
影响因子：
16.6
通讯作者：
D'Hondt S
中科院分区：
文献类型：
--
作者：
Sauvage JF;Flinders A;Spivack AJ;Pockalny R;Dunlea AG;Anderson CH;Smith DC;Murray RW;D'Hondt S
Water radiolysis continuously produces H2 and oxidized chemicals in wet sediment and rock. Radiolytic H2 has been identified as the primary electron donor (food) for microorganisms in continental aquifers kilometers below Earth’s surface. Radiolytic products may also be significant for sustaining life in subseafloor sediment and subsurface environments of other planets. However, the extent to which most subsurface ecosystems rely on radiolytic products has been poorly constrained, due to incomplete understanding of radiolytic chemical yields in natural environments. Here we show that all common marine sediment types catalyse radiolytic H2 production, amplifying yields by up to 27X relative to pure water. In electron equivalents, the global rate of radiolytic H2 production in marine sediment appears to be 1-2% of the global organic flux to the seafloor. However, most organic matter is consumed at or near the seafloor, whereas radiolytic H2 is produced at all sediment depths. Comparison of radiolytic H2 consumption rates to organic oxidation rates suggests that water radiolysis is the principal source of biologically accessible energy for microbial communities in marine sediment older than a few million years. Where water permeates similarly catalytic material on other worlds, life may also be sustained by water radiolysis. The extent to which chemical products of water radiolysis could sustain subseafloor microbial life is unknown. Here the authors show that sediment catalyzes radiolytic production of H2 and oxidants, providing the primary energy source for life in ancient marine sediment.
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影响因子：
5.2
作者：
Adhikari RR;Glombitza C;Nickel JC;Anderson CH;Dunlea AG;Spivack AJ;Murray RW;D'Hondt S;Kallmeyer J
通讯作者：
Kallmeyer J
影响因子：
4.4
作者：
CACCAVO, F;BLAKEMORE, RP;LOVLEY, DR
通讯作者：
LOVLEY, DR
影响因子：
8.8
作者：
Do, Si-Hyun;Batchelor, Bill;Kong, Sung-Ho
通讯作者：
Kong, Sung-Ho
影响因子：
2.3
作者：
Batzke, Anja;Engelen, Bert;Cypionka, Heribert
通讯作者：
Cypionka, Heribert
DOI：
10.1016/s0967-0645(02)00076-0
发表时间：
2002-01-01
影响因子：
3
作者：
DeMaster, DJ
通讯作者：
DeMaster, DJ