Figure 1.

DNA PT modification enhances resistance to X-ray radiation, UV radiation and H₂O₂ exposure in an E. coli Hpx⁻ mutant. (A) The cells were treated with X-ray radiation for approximately 0 min, 2 min, 5 min, 8 min, 10 min, 15 min and 20 min and then plated to determine their viability. (B) The cells were treated with UV radiation for approximately 0 min, 5 min, 10 min, 15 min and 20 min and then plated to determine their viability. (C) The cells were treated with increasing concentrations of H₂O₂ for 15 min and then plated to determine their viability. The data shown represent the results of three independent experiments, and the error bars indicate the standard deviations.