Figure 4From: Characterisation of the Escherichia coli membrane structure and function during fedbatch cultivationEffect of sonication time on E. coli W3110 shown as β-lactamase release compared to French press data. Top filled squares: French press data. From top to bottom: 2, 1.5, 1, 0.5 minutes sonication at constant effect and cell mass. The specific growth rate is indicated in the figure by a dashed line.Back to article page