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Oxidation of CH4 at mixing ratios of <200 ppmv (○) in closed vials (125 ml) containing 50 ml of NMS inoculated with the enrichment culture at day 0. Methane was added to the vials at 34 and 46 days. The data are the means of results with six vials ± 1 standard error of the mean. □, mean of results with three uninoculated vials.
