FIG 8.

UV₂₂₂ and UV₂₅₄ killing of wild-type and spl B. subtilis spores. Isogenic wild-type and spl spores were irradiated with UV₂₂₂ and UV₂₅₄, and spore survival at various times was determined as described in Materials and Methods. Symbols: △ and ○, wild type; ▲ and ●, spl; ○ and ●, UV₂₅₄ irradiated; △ and ▲, UV₂₂₂ irradiated. Data shown are averages from duplicate determinations ± standard deviations in one experiment. This experiment was repeated twice, and the same relative rates of killing of spores of all strains and at the two wavelengths were seen.