FIG. 2.

Bactericidal activities of silver zeolite and silver nitrate in anaerobiosis (A) and on a catalase-deficient strain of E. coli (B). (A) OW6 cells were treated at 37°C with silver zeolite at 10 mg/ml in 20 mM potassium phosphate buffer (circles) or silver nitrate at 1 μM in 20 mM HEPES-NaOH buffer (squares) anaerobically (open symbols) or aerobically (closed symbols). (B) Cells of the wild-type strain UM1 (closed symbols) and a catalase-deficient strain CSH7 (open symbols) were treated similarly but aerobically with silver zeolite (circles) and silver nitrate (squares).