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Scanning electron microscopic (SEM) images of a 3 day biofilm of Enterococcus. faecalis and Pseudomonas aeruginosa (A) before and (B) after photodynamic therapy (PDT) using 660 nm diode laser. In panel B the lost biofilm structure can be seen. Arrows point to changes in cellular morphology and alterations in cellular size. Asterisks show structures suggesting cellular rupture and grooves on cell membrane especially for E. faecalis (cocci shaped bacteria).
