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DNA damage expressed as tail intensity (% DNA in tail) in BEAS-2B cells after a 24-h treatment with gold nanoparticles (core diameter: ~5 nm (a) or ~20 nm (b)). Treatment is expressed as the antilog of Log2 of the dose. Here, 100 µM H2O2 was used as a positive control (C+; symbols on the right show results from the experiments carried out). The symbols represent means ± SD. Statistical significance in comparison with control cultures (one-way ANOVA): * p < 0.05; *** p < 0.001.
