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Heterotrophic bacteria containing sqr and pdo oxidized exogenous sulfide. Cells were cultured in LB, harvested, wash and re-suspended at OD600nm of 2 in 50 mM HEPES buffer, pH 7.4, containing 50 µM DPTA. NaHS was added to 100 or 200 µM to initiate the reaction. a Six bacteria oxidized exogenous sulfide rapidly. b Three bacteria slowly oxidized exogenous sulfide; E. coli did not. Control contained no cells. Averages (n ≥ 3) with standard deviations (error bar) were shown
