Fig. 1: Subatmospheric H2 oxidation by Hyd-1h in cells of Methylacidiphilum fumariolicum SolV.

The dashed line indicates the atmospheric H2 concentration (0.53 ppmv). The arrows indicate when hydrogen gas was added. One hundred twenty milliliters capped serum bottles were inoculated with 10 mL (OD600 = 0.12) heat-killed cells (HK) or viable cells (VC). At 29 h, H2 was again supplemented to VC. Error bars indicate standard deviations (n = 3).