Fig. 2
From: Novel facultative Methylocella strains are active methane consumers at terrestrial natural gas seeps
Consumption of methane by environmental samples from natural gas seep sites of Pipe Creek (a) and Andreiasu Everlasting Fire (b). Microcosms containing environmental samples were incubated under 13C-methane (red circles) or 12C-methane (blue circles) as the only sources of C or energy without any supplementary nutrients. The total amount of methane was injected into the headspace in two spikes (approximately 100 μmol/gram of fresh sample per spike). Data points show the mean (with error bars showing the standard errors) of duplicate incubations for each substrate