TABLE 5.

Efficiency of induction of λcIind prophages^a

Plasmid and gene(s)	Concn (cells/ml) at t1	Frequency of infective centers (λc+)b at t1	Concn of phage (λc+/ml)b at:
			t1	t2	t3
C600ΔrecA(λ plac5)
No plasmid	2.3 × 108	9.0 × 10−9	1.5 × 102	1.3 × 102	1.6 × 102
pDR211 (rcsA::ΔTn903)	2.4 × 108	3.3 × 10−8	2.8 × 102	1.8 × 102	3.7 × 102
pDR311 (dsrA::ΔTn903)	1.4 × 108	1.5 × 10−8	1.0 × 102	1.0 × 102	1.4 × 102
pDR210 (rcsA+)	1.8 × 108	2.0 × 10−7	1.7 × 103	9.2 × 102	4.3 × 102
pDR311 (dsrA+)	1.4 × 108	1.6 × 10−6	8.0 × 102	3.1 × 103	8.5 × 103
C600 (λDY125 plac5)
No plasmid	3.6 × 108	4.0 × 10−8	3.0 × 102	1.7 × 102	1.6 × 102
pDR211 (rcsA::ΔTn903)	2.8 × 108	3.6 × 10−8	1.7 × 102	2.0 × 102	2.1 × 102
pDR311 (dsrA::ΔTn903)	3.3 × 108	1.8 × 10−8	2.9 × 102	2.4 × 102	2.1 × 102
pDR210 (rcsA+)	3.6 × 108	1.1 × 10−7	4.3 × 103	2.2 × 103	6.2 × 102
pDR311 (dsrA+)	2.7 × 108	2.5 × 10−7	1.4 × 103	4.0 × 103	2.9 × 103
C600(λGE112 plac5)
No plasmid	1.8 × 108	2.0 × 10−8	90	50	50
pDR211 (rcsA::ΔTn903)	2.9 × 108	2.0 × 10−8	50	30	40
pDR311 (dsrA::ΔTn903)	2.2 × 108	2.0 × 10−8	50	30	30
pDR210 (rcsA+)	2.0 × 108	4.0 × 10−8	3.6 × 102	6.0 × 102	2.0 × 102
pDR311 (dsrA+)	2.3 × 108	3.8 × 10−7	1.2 × 103	9.4 × 102	7.9 × 103

^aExperimental methods and conditions were as described in footnote a of Table 3. Data presented are as described in footnote a of Table 3. 

^bλc⁺, turbid plaques of λcIind phages.