TABLE 1 .

Hydrogen, formate, and methane formation rates in Fe(0) corrosion experiments in nmol electron equivalents/h^a

Experimental condition	Formate	H2	CH4
MM901 cells with Fe	1 ± 0.2		514 ± 149
MM901 SCM with Fe	49 ± 17	274 ± 115
MM1284 cells with Fe	1 ± 0.4	40 ± 4	9.4 ± 3.6
MM1284 SCM with Fe	16 ± 14	51 ± 7.8
Abiotic with Fe	0.9 ± 0.3	50 ± 2.8

^aValues are the means from 5 replicate experiments ± standard deviations (reported as electron equivalents required to form these compounds from their oxidized precursors H⁺ or CO₂).