FIG. 1.
PI fluorescence of L. plantarum during incubation with nisin and reutericyclin. Control lines represent the fluorescence of viable and heat-killed (80°C, 10 min) cells. Inhibitors were added to obtain the following concentrations: 10 (○), 5 (□), and 2.5 (▵) mg of nisin liter−1 and 33 mg of reutericyclin liter−1 (•). The results are representative for two independent experiments. Corresponding results were obtained with L. sanfranciscensis (data not shown). RFU, relative fluorescence units.