Fig. 7From: Visible light-regulated cationic polymer coupled with photodynamic inactivation as an effective tool for pathogen and biofilm eliminationa Fluorescence spectra of E. coli suspensions stained with SYTO/PI after Ce6-TPP-PEI (A), TPP-PEI (B), free Ce6 (C) and PBS (D) in the presence (5 min at 30 mW/cm2) or absence of visible light irradiation (b). The red/green fluorescence ratios were calculated (c). The concentration of Ce6 was 1.746 µg/mLBack to article page