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Evaluation of the functional decline of DNA by X-ray irradiation and enhancement by PpIX for plasmid pBR322. (A) The number of E. coli colony forming units (CFUs) on medium with ampicillin by transforming plasmid irradiated with X-ray at different concentrations of PpIX. (B) The number of E. coli colony forming units (CFUs) on medium with tetracycline. (Data given with n = 3, *: p < 0.05 in a one-way ANOVA and Tukey post-test)
