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Sulfate reduction by Desulfobulbus propionicus after inoculation into defined growth medium (DSM 194 medium) in the presence (▪) and in the absence (○) of antibiotics (chloramphenicol and streptomycin). The initial sulfate concentration was 23.1 mM. The isotope concentration was 20 kBq of 35SO42−/ml. The inset shows a 24-h time course for the same experiment.
