TABLE 2.

MICs of carbenicillin against P. aeruginosa PAO1 in the presence of different concentrations of polyamines, EDTA, and PMBN^a

Compound	MIC (μg/ml) of carbenicillin at compound concn of:
	0	0.5	1	5	10	20
Spermidine	64	32	16	16	8	4
Spermine	64	16	4	4	4	4
Putrescine	64	64	32	32	32	16
Cadaverine	64	64	32	32	32	16
EDTA	64	32	4	4	NG	NG
PMBN	64	4	2	NG	NG	NG

^aMIC measurements in MH broth were repeated three times with identical results. The concentration of PMBN is in μg/ml while other concentrations are in mM. NG, no growth.