Fig. 2
From: Assessing methanotrophy and carbon fixation for biofuel production by Methanosarcina acetivorans
Biomass yield (per 10 mmol methane) as a function of the ΔG of external electron acceptor reduction (kJ/electron-pair) predicted by the iMAC868 model of M. acetivorans. Solid line methane as the sole carbon source; dashed line bicarbonate and methane (at a ratio of HCO3 −/CH4 = 0.44) as carbon sources. Vertical dotted lines show the ΔG (kJ/electron-pair) of reduction for Fe3+ (−140.44), MnO2 (−77.65), NO3 − (−68.15), and SO4 2− (+44.53). A magnified insert shows the maximum biomass yields for sulfate-dependent methanotrophy. All ΔG values were evaluated at pH of 7, 25 °C, and an ionic strength of 0.25 M as described by Alberty [64]