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Lysis of E. coli O157:H7 in the presence of colistin at concentration of 0.06, 0.12, 0.24, 0.36, and 0.48 μg/ml for 0 h (♢), 3 h (□), 9 h (△), and 18 h (×) at 30°C. Error bars represent standard deviations calculated from duplicate experiments.
