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The influence of PQ on drug tolerance of E. coli BW25113. (A) Time-dependent killing by ampicillin (50 μg/ml), ofloxacin (1 μg/ml), and kanamycin (50 μg/ml). (B) Time-dependent killing by different fluoroquinolones: ofloxacin (1 μg/ml), norfloxacin (1 μg/ml), and ciprofloxacin (0.15 μg/ml). The growing population of BW25113 was treated with 0.8 mM PQ for 30 min before antibiotics were applied.
