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Qualitative determination of antibiofilm activity of tested compounds (0, 125 and 500 mg/L) with the use of confocal laser scanning microscopy: (a) S. aureus biofilm and (b) E. coli biofilm (light green fluorescence—viable bacteria with intact cell membranes, red and yellow fluorescence—dead bacteria; control E. coli biofilm was visualized by Nomarski contrast, as the exopolymeric matrix hindered the penetration of the DNA probes).
