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Viability V of HeLa and A549 cells upon incubation with Au NPs. Au NPs were incubated with HeLa (A) and A549 (B) cells for 4 h in medium with serum. Untreated cells were used as a control (100%). Cell viability was assayed 24 h after incubation with an MTT assay. NP concentrations c(NP) between 0.2 nM and 200 nM were tested. The lines between the individual points are merely intended as a guide to the reader; they do not correspond to a mathematical fit.
