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In vitro inactivation of E. coli growing in biofilm state (18 J/cm2 at 625 ± 25 nm, 78 µM MB concentration). Survival fractions are presented as mean + standard deviation (SD). Circles: cell control (BF1 −L −MB); triangles: light control (BF2 +L −MB); squares: MB control (BF3 −L +MB); bars: test (BF4 +L +MB).
