FIG. 3.

Permeabilization of cytoplasmic membrane of E. coli ML35 by cationic peptides as determined by their ability to unmask cytoplasmic β-galactosidase. The hydrolysis of ONPG was measured spectrophotometrically at 420 nm. Symbols: ▴, CP26 at 12.8 μg/ml; ●, CEME at 6.4 μg/ml; ○, CEMA at 6.4 μg/ml; ▾, CP29 at 6.4 μg/ml; ■, polymyxin B at 12.8 μg/ml; □, CP201 at 12.8 μg/ml; ▵, CP208 at 12.8 μg/ml.