Effect 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.
Shokri and Larsson Microbial Cell Factories 2004 3:9 doi:10.1186/1475-2859-3-9