FIG. 7.

Increase in K⁺ ion concentration in the extracellular medium after addition of enterocoliticin to Y. enterocolitica 13169 cultures at 37°C. Final concentrations of enterocoliticin were (●) 2.2 × 10⁵ AU ml⁻¹, (▪) 2.2 × 10⁴ AU ml⁻¹, (▴) 2.2 × 10³ AU ml⁻¹, and (♦) 2.2 × 10² AU ml⁻¹. Maximal K⁺ ion release from heated samples (dotted line) and untreated control culture (dashed line) is shown. Each K⁺ value was determined twice (the deviation between two values was less than 1%). The experiment was repeated twice with similar results.