FIG. 4.

Consumption of micromolar concentrations of MeBr by strain IMB-1 exposed to either nanomolar or micromolar concentrations of MeBr. Symbols: ▵ and ▴, not exposed to MeBr; □ and ■, exposed to 20 nM MeBr; ○ and ●, exposed to 100 μM MeBr. Open symbols indicate cells incubated with chloramphenicol (250 μg/ml). Cell densities were 1.1 × 10⁹ cells/ml in both experiments. Symbols represent the mean of three suspensions, and bars indicate ±1 standard deviation. Absence of bars indicates that the error was smaller than the symbols.