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Reduction of Fe-beads by Shewanella strains. The strains used were S. oneidensis MR-1, Shewanella sp. strain ANA-3, S. putrefaciens CN-32, and E. coli MG1655. Killed MR-1 cells were killed by formaldehyde treatment as described in Materials and Methods. The data are the averages of duplicate experiments, and the error bars indicate the data ranges for 3-day incubations with Fe-beads.
