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Effect of nitrate availability on antibiotic susceptibilities of young (4-h-old) P. aeruginosa colony biofilms under aerobic (A) and anaerobic (B) conditions. The error bars represent the standard errors of the means for each value. •, control; ○, ciprofloxacin; ▵, tobramycin; □, carbenicillin; ▿, ceftazidime; , chloramphenicol; ◊, tetracycline.
