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H2 oxidation by carbon-limited cultures of M. smegmatis mc2155 and derivatives. All strains were inoculated to a density of 3 × 107 cfu⋅mL−1 (OD600 = 0.4). H2 mixing ratios were measured upon inoculation of culture and at regular intervals over 84 h. The mixing ratios are displayed on a logarithmic scale. Error bars represent SDs from three biological replicates. The dashed lines represent the average global mixing ratio of tropospheric H2 (0.53 ppmv).
