Effect of orthophosphate on growth of WT cells (strain AJW678) aerated at 37°C in MOPS medium supplemented with 0.8% pyruvate and containing K2HPO4 at the following concentrations: 2.0, 1.0, 0.4, 0.2, 0.1, and 0.05 mM. The plotted values are means of two independent experiments ± standard deviation. OD600, optical density at 600 nm.