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(A) Contact killing of E. hirae on iron. Cells suspended in Na-HEPES buffer and 4 mM CuSO4 were incubated on iron coupons under either aerobic (●) or anaerobic (○) conditions. The results for controls without copper under anaerobic (▲) or anaerobic (△) conditions are also indicated. (B) Same as in panel A, but the cells suspended in Tris-Cl buffer. The error bars indicate the standard deviations of three independent experiments.
