Figure 1.

(a) Survival rates of E. coli bacterophage MS2 under UV irradiation. Log scale base 10. (Black circle) 222 nm, (Black diamond) 254 nm, The susceptibility ratio, k(222 nm)/k(254 nm) is 1.5 for the decays. N = 2 and n = 3, (b) (left half)survival rates of E. coli K-12 irradiated at 222 and 254 nm, (right half) photorepair rates by irirradiation at 365 nm. (Black circle) 222-nm irradiation followed by 365-nm irradiation, (white circle) 222-nm irradiation followed by preservation under dark conditions (control experiment), (black diamond) 254-nm irradiation followed by 365-nm irradiation, (white diamond) 254-nm irradiation followed by preservation under dark conditions (control experiment). N = 2 and n = 3.