FIG. 4.

Degradation of PCP by and cell growth of wild-type and mutant strains of S. chlorophenolicum. Degradation of 0.3 mM PCP by (a) and growth of (b) cells not previously exposed to PCP, degradation of 0.3 mM PCP by (c) and growth of (d) cells previously exposed to 50 μM PCP, and degradation of 3 mM PCP by (e) and growth of (f) cells previously exposed to 50 μM PCP are shown. Symbols: ▪, wild type; ♦, strain 108; •, strain 130; ♦, strain 206; •, strain 215; ♦, strain 307; •, strain 316; ▪, strain 320. For the experiments in panels c to f, cells were grown in the presence of 50 μM PCP and additional PCP was added when the OD₅₅₀ reached 0.6.