Table 1.

Virion production by Apr gene-marked H-19B lysogens

StrainPhage titer (PFU/104CFU)aFold inductionc
Before mitomycin treatmentAfter mitomycin treatmentb
MC4100 H-19B425 × 1046.3 × 104
MC4100 H-19B-Ap11164 × 1045.8 × 104
MC4100 H-19B-Ap2718 × 1042.6 × 104
  • a Serial dilutions of chloroform-treated supernatants were plated on E. coli C600.

  • b Cultures with an optical density at 600 nm of 0.5 were treated with mitomycin C at 250 ng/ml for 4 h.

  • c Calculated by dividing the number of PFU after mitomycin C treatment by the number of PFU prior to mitomycin C treatment.