FIG. 1.

UV sensitivity of strains carrying the uvrD300 (A406T) mutation. Experiments were carried out as described in Materials and Methods. Data (log survival) are expressed as the logarithmic function of the number of UV-irradiated cells forming colonies divided by the number of colonies formed by unirradiated cells. Survival curves represent the average of at least three independent determinations. ⊞, SK9040 (uvrDΔ294/pWSK29) at 30°C; ♦, SK9040 (uvrDΔ294/pWSK29) at 44°C; □, SK9041 (uvrDΔ294/uvrD⁺) at 30°C; ◊, SK9041 (uvrDΔ294/uvrD⁺) at 44°C; ○, SK9052 (uvrDΔ294/uvrD300) at 30°C; ▵, SK9052 (uvrDΔ294/uvrD300) at 44°C; ⊕, SK9062 (uvrD⁺/uvrD300) at 30°C; and ▿, SK9062 (uvrD⁺/uvrD300) at 44°C. SK9067 gave survival curves identical to those of SK9041.