Concentration dependence of BES inactivation of epoxypropane degradation in cell suspensions of X. autotrophicus. Assays were performed with propylene-grown cells (0.12 mg protein). Symbols: □, buffer-only control; •, no BES present; ○, 1 mM BES present; ▾, 2.5 mM BES present; ▵, 5 mM BES present; ▪, 10 mM BES present.