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Effect of Polar supernatant treatment on biofilm formation for P. aeruginosa PAO1. Data are reported as percentage of residual biofilm after the treatment. Biofilm formation was considered unaffected in the range 90–100%. Differences in mean absorbance were compared to the untreated control and considered statistically significant when p < 0.05 (∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001) according to Student’s t-test.
