Natural Transformation of Zinc Oxide Nanoparticles and Their Cytotoxicity and Mutagenicity

Figure 4

Mutation frequencies in cells after pristine or alkalized nanoparticle (NP) exposure. The relative ratio of increased mutation frequencies is expressed as a fold increase over the background after treatment with different NP concentrations for 72 h. The data are presented as of at least three independent experiments. Significance is indicated by .