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Headspace CO concentrations (ppm; means ± 1 SE, n = 3) as a function of time for A. ehrlichii MLHE-1 incubated on basalt cinders with the following treatments: ○ and ● represent ambient atmosphere and 99.8% N2/0.2% O2, respectively; ■ represents 95% CO2/4.8% N2/0.2% O2; and □ represents 9.5% CO2/89.5% N2/1% O2.
