Correlation between the P
activity and alginate overproduction in various strains of P. aeruginosa . A) Measurement of the P
activity in various mucoid laboratory and clinical strains. B) Measurement of alginate production (μg/ml/OD600) by the same set of strains as in A grown on PlA plates without carbenicillin for 24 h at 37°C. The algU(WT)-PAO1 represents the PAO1 strain contained the pHERD20T-algU(WT). The values reported in this figure represent an average of three independent experiments with standard error.