Cells were grown in Luria Bertani (LB) media at 37C at 200 rpm. Overnight cultures were inoculated with single, independent colonies in triplicate, incubated aerobically overnight at 37oC, and sub-cultured to a starting OD600 of 0.0001. Cultures were harvested at OD600 = 0.3 in exponential phase and at OD600 = 1.5 in stationary phase.