Energy metabolism | Overall chemical reaction | Identified (I)/cultured (C) | ΔG r° 2, 250(kJ) a |
---|---|---|---|
Aerobic reactions | Â | Â | Â |
  Aerobic methanotrophy | CH4 + 2O2 = CO2 + 2H2O | I and C | -860.7 |
  Hydrogenotrophic O2 reduction | H2 + 1/2O2 = H2O | I and C | -264.4 |
  Thiotrophic (H2S-oxidizing) O2 reduction | H2S + 2O2 = SO4 2- + 2H+ | I and C | -758.2 |
  Fe(II)-oxidizing O2 reduction | Fe2+ + 1/4O2 + H+ = Fe3+ + 1/2H2O | I and C | -52.6 |
Anaerobic reactions | Â | Â | Â |
  Hydrogenotrophic methanogenesis | H2 + 1/4CO2 = 1/4CH4 + 1/2H2O | I and C | -49.2 |
  Hydrogenotrophic SO4 reduction | H2 + 1/4SO4 2- + 1/2H+ = 1/4H2S + H2O | I and C | -74.9 |
  Hydrogenotrophic Fe(III) reduction | H2 + 2Fe3+ = 2Fe2+ + 2H+ | I and C | -159.2 |
  Anoxic methanotrophy with SO4 reduction | CH4 + SO4 2- = HCO3 - + HS- + H2O | I but not yet C | -30.1 |