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Fluorescence microscope images of Listeria monocytogenes, Enterococcus faecalis, Escherichia coli, and Staphylococcus aureus biofilm cells grown at 37°C for 24 h on stainless steel after treatment with microencapsulated RuL3 at the minimum inhibitory concentration (MIC). Cells were visualized after staining with SYTO-9 (green fluorescence for living bacteria) and propidium iodide (red fluorescence for dead bacteria). The control represents cells treated with tryptone salt buffer.
