Fig. 6From: A Review on Enhancing the Antibacterial Activity of ZnO: Mechanisms and Microscopic InvestigationFluorescence microscopy images of E. coli and S. aureus treated (a) without and (b) with ZnO–PVA NPs. Green fluorescence is characteristic of live cells, whereas red fluorescence is due to dead cells. Reproduced from ref. [14] with permission from The Royal Society of ChemistryBack to article page