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Effect of various OB3b-MB concentrations on methylmercury (MeHg) production by washed cells of D. desulfuricans ND132 (a) and G. sulfurreducens PCA (b) at 72 h in phosphate-buffered saline (PBS). Hg(II) (25 nM) was preequilibrated with the indicated amounts of OB3b-MB for 30 min prior to addition of cells. Error bars represent the deviation between the two replicate samples (X1 and X2), defined as the absolute value of (X1 − X2)/2.
