Figure 4From: Norvaline is accumulated after a down-shift of oxygen in Escherichia coli W3110Concentrations of free amino acids and pyruvate during fed-batch cultivations of E. coli W3110 without (as control, open squares) and with a stirrer downshift resulting in an oxygen limited culture (closed triangles). The analysis was performed from clarified crude extracts containing medium and cells as described in Materials and Methods.Back to article page