Fig. 3.

Acetate and carbon dioxide production yields as a function of bicarbonate to methane ratio (a, b) and biomass yield (c, d) using Fe³⁺ (solid lines) or SO₄ ²⁻ (dashed lines) as external electron acceptors. Methane was the sole carbon source for generating the plots shown in panels (c) and (d). All yields are per 10 mmol of methane