Figure 2.

Effect of N₂O on CH₄ production and growth yields in axenic M. Barkeri cultures; the upper panels show time courses of CH₄ production in cultures that received MeOH (A), H₂ (C), or acetate (E); the bottom panels display growth yields after 38-day incubation for M. Barkeri growing with MeOH (B), H₂ (D), or acetate (F); error bars represent the standard deviation of replicate samples and are not shown when smaller than the symbol size; n = 3 for (A), (C), and (E); n = 9 (including three technical replicates for triplicate biological samples) for (B), (D), and (F).