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Dose-dependent inhibition of proteolytic activity (panel A) and pyocyanin production (panel B) by 1, 2 and penicillic acid (PA). P. aeruginosa PAO1 grown in the presence of diluting solvent was used as negative control in both experiments. Data are expressed as SD of mean (n = 3). * P < 0.05 versus control by ANOVA followed by Bonferroni posttest.
