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β-lactamase activity of P. stutzeri A15 pEstAβ-bla, pEstA-bla and pEstA*-bla. Relative β-lactamase activity of whole cells of P. stutzeri A15 pEstAβ-estAP, pEstAβ-bla, pEstA-bla, pEstA*-bla or empty vector (EV) assessed with nitrocefin as the substrate. Data represent the mean of three independent repeats ± 95% confidence interval. The significance level (P < 0.05) as determined by one-way ANOVA with Student-Newman-Keuls as post-hoc analysis is indicated with a letter code.
