TABLE 1.

MICs (μg/ml) of β-lactams determined in LB medium with 50 or 300 mm NaCl

Drug	LA51A ΔompF NaCl		LA51A ΔompC NaCl
	50 mm	300 mm	50 mm	300 mm
Ampicillin	35	9	12	12
Benzylpenicillin	246	123	138	123
Carbenicillin	14	4	4	4
Cephalothin	92	54	69	62
Cefaclor	20	5	9	8
Cefamandole	2.4	0.7	1.1	0.7
Cefazolin	6.4	3.5	3.4	3.7