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ROS-induced fluorescence in P. aeruginosa PAO1 biofilms. (A) Fluorescence generated over time. (B) Fluorescence at 24 h and 45 h. CIP: 1.2 μg/ml ciprofloxacin; MA-CIP: 60 mM d,l-malic acid combine with 1.2 μg/ml ciprofloxacin; CAZ: 12.48 μg/ml ceftazidime; SA-CAZ: combination of 120 mM sodium acetate and 12.48 μg/ml ceftazidime. Values shown are the mean (n = 3). Error bars indicate standard error, **, P < 0.01.
