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The relative biofilm formation of the wild type and derivatives (amoxicillin-induced) of E. coli strain No 5. (A) and No. 6 (B). The biofilm was analyzed based on the OD value of the absorbed crystal violet (0,3%) measured at 531 nm (A531). The results represent the values of relative biofilm formation (BRel) independent of bacterial growth (A531/A600). The study was performed in four replications, in two independent experiments.
