TABLE 2.

Transduction frequencies of β-lactam-induced SaPI-containing lysogenic strains^a

Donor strain	Phage	SaPI	Inducerb	Transduction titerc
JP44	φ80α	SaPIbov1	MC	7.2 × 109
			A	2.7 × 107
			P	3.0 × 107
			CL	1.6 × 107
			CE	3.2 × 107
			NI	8.1 × 104
JP47	φ11	SaPIbov1	MC	2.1 × 106
			A	6.0 × 104
			P	5.8 × 104
			CL	4.4 × 104
			CE	5.6 × 104
			NI	1.7 × 103
JP50 (recA mutant)	φ11	SaPIbov1	MC	<10
	A	<10
			NI	<10
JP85 [JP83 LexA (G94E)]	φ80α	SaPIbov1	MC	5 × 105
	A	4 × 104
			NI	2.3 × 103
JP52	φ11 cIG131E	SaPIbov1	MC	<10
			A	<10
			NI	<10
RN8667	φ80α	SaPI1	A	2.1 × 105
			P	1.6 × 105
			CL	2.2 × 105
			CE	2.9 × 105
			NI	6.0 × 103

^aResults from a representative experiment are shown.

^bMC, mitomycin C (2 μg/ml); A, ampicillin (10 μg/ml); P, penicillin G (10 μg/ml); CL, cloxacillin (10 μg/ml); CE, ceftriaxone (10 μg/ml); NI, not induced.

^cNumber of transductants per milliliter of induced culture, using RN4220 as the recipient strain.