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Resource: used or used up in processes

Hydrogen

Appears in 3 processs and 4 steps. Everything below is linked: open a process to see it in context.

Top processes

Methane cycle: methanogenesis and methanotrophy

2 steps

Which substrate feeds methanogenesis (roughly two thirds acetate, one third H2 plus CO2 in moderate-temperature paddy and sediment; bogs shift toward H2/CO2)
Hydrogenotrophic methanogens reduce Carbon dioxide with Hydrogen supplied by syntrophic fermenters (H2 must stay at a few Pa)

Redox ladder: sequential electron acceptors in waterlogged soil

1 step

CO2 is reduced to Methane below about -200 mV

Biological nitrogen fixation: nitrogenase, oxygen protection and regulation

1 step

Nitrogenase (Mo-Fe protein) reduces N2 using 16 ATP and 8 electrons per N2, with 1 H2 co-produced

Often found with

Carbon dioxide 3 Methanogenic archaea 2 Methane 2 Nitrogenase 1 Free-living diazotrophs 1 Dinitrogen 1 Carbon 1 Fermenting bacteria 1 Acetate 1 Hydrogenotrophic methanogens 1 Syntrophic bacteria 1

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