Effects of BES on growth of R. rhodochrous strain B276 with propylene, acetone, and propane as carbon sources. (A) Growth with propylene. Symbols: •, no BES present; ○, 5 mM BES present. (B) Growth with acetone (triangles) and propane (squares). Solid symbols, no BES present; open symbols, 5 mM BES present. The data are the averages of measurements for two cultures.