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Reduction of Fe-beads by S. oneidensis MR-1 mutants defective in iron reduction. The strains used were strain MR-1 (Wild Type), DKN247 (omcB), DKN248 (mtrB), DKN249 (menF), and DKN250 (cymA). menF + MK-4, strain DKN249 with 10 μM MK-4 added to the anaerobic preincubation with fumarate; menF + DHNA, strain DKN249 with 10 μM DHNA added to the anaerobic preincubation with fumarate. The data indicate the amounts of Fe reduced following our standard 3-day incubation with 6.7 × 108 cells/ml.
