TABLE 2.

Cocultivation of a competence-inducible strain (A1) and a competence-deficient strain at different densities during logarithmic growth

Deficient strain or DNA fragment	Pheromone added	No. of CFU of transformants/ml at OD550 of:
		0.1	0.2	0.4
H2a	Yes	1.8 × 104	4.8 × 104	9.7 × 104
	No	2.0 × 101	0	1.0 × 101
Novr DNA from CP1500b	Yes	5.9 × 105	3.4 × 105	2.4 × 105
	No	0	0	1.0 × 101

^aCompetence-deficient mutant lacking a functional comE gene.

^bOne microgram of purified DNA per milliliter from novobiocin-resistant strain CP1500 was used to transform strain A1.