Fig. 5.

Induction of prophage λ in MG1655 hosts bearing the pJW0tet vector (closed squares), pGAW3775tet (open squares), pJWea8.5 (open diamonds), pJWea22 (closed triangles), pJWorf (open circles), pJWorfea22 (closed circles) or pJWea22ea8.5 (open triangles). Bacterial cultures were treated with 0.2 μg/ml mitomycin C (a), 50 J/m² UV irradiation (b), or 1 mM H₂O₂ (c) at time 0. Results are shown as PFU (plaque forming units) per cell. The presented results are mean values from three experiments. SD was below 20 % for each point, and is not shown for clarity of presentation