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Reduction of Fe(III) in ferrihydrite in incubations of S. deleyianum (A) supplied with 5 mM acetate as a carbon source, 2 mM cysteine as a sulfur source and reductant, 10 mM formate as an electron donor, and different sulfur species as electron acceptors and in an abiotic control experiment (B). Error bars for the experiments with 2 mM cysteine and 0.1 mM thiosulfate represent standard deviations based on three replicates.
