FIG. 3.

Growth experiments with S. deleyianum supplied with acetate, formate, cysteine, and 0.01% inoculum. (A) Growth with fumarate (20 mM) or thiosulfate (2 mM) as electron acceptor in the absence or presence of tungstate (5 mM). Data from representative cultures are shown. (B) Ferrihydrite reduction in growth experiments supplied with ferrihydrite and thiosulfate. Except for the control experiment, different concentrations of tungstate were added. Means of duplicate determinations are shown for representative cultures.