FIG. 1.

Differential response of E. coli HB101(pUCD607) and S. cerevisiae LucΔ to diuron. S. cerevisiae and E. coli cells were exposed to identical concentrations of diuron. S. cerevisiae (●) exhibits a toxic response at levels of toxin where the E. coli (○) cells do not sense any toxicity. The experiment was carried out in triplicate at 25°C, and the error bars represent standard errors of the mean triplicate values. For comparative assays the same biosensor sample was used; however, for the assays presented here, they were repeated on at least three occasions and the trends were found to be identical.