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Cell density and (H2S)T throughout a methylation experiment with triplicate cultures of D. desulfuricans ND132 (I = 0.2 M) with initial (H2S)T of 7.5 mM in the absence (•) and presence (▴) of elemental sulfur. Open circles and triangles indicate killed controls for each group. Cinnabar was present in all bottles. Error bars represent the standard deviations of measurements.
