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Fluorescence microscopy with biofilm coverslips. Biofilms were stained with acridine orange. Bar equals 20 μm a S61 biofilm, control coverslip; b S61 biofilm treated with 50 μl/ml of ROEO. c Viability assessment within Staphylococcus epidermidis biofilm challenged with various ROEO concentrations using resazurin assay. The results are presented as means ± SD of three independent experiments. ** p < 0.01 or ***p < 0.001 versus control values
