FIG. 2.

Fluorescence response of P. fluorescens A506(pTS) to various concentrations of toluene measured after different exposure periods. Fluorescence (in RFU) measured with a fluorometer is defined as culture fluorescence divided by culture OD₆₆₀. •, 1-h toluene incubation; ▾, 2-h toluene incubation; ▪, 3-h toluene incubation. All points represent the means of 2 to 5 replicates, and error bars represent the standard errors of the means (SEM).