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Biofilm images from methylene chain-coated pHEMA hydrogel experiments. Images are shown for each observation time period and each system configuration. Biofilms grown on hydrogels configurations: no ultrasound application or ciprofloxacin (row A); ultrasound application, no ciprofloxacin (row B); no ultrasound application, ciprofloxacin treatment (row C); and ultrasound application and ciprofloxacin (row D). Scale bar, 50 μm.
