FIG 3.

Time course of methane accumulation in the culture headspace of Methanomassiliicoccus luminyensis (A and C) and “Ca. Methanoplasma termitum” (B and D) incubated in bicarbonate-buffered medium supplemented with H₂ (ca. 50 kPa), methanol (50 mM), or acetate (30 mM) (A and B) or H₂ combined with different methylamines (10 mM) (C and D). To avoid a transfer of residual methanol with the inoculum, the precultures were grown under methanol limitation. The values are means of three replicate cultures; standard deviations are shown only if they are larger than the symbols.