Fig. 4

Effect of Ca⁺² and Mg⁺² ions on the number of free-floating phage SA14 particles after 20 min of incubation with the host microorganism. This experiment is a measure of the phage’s rate of adsorption. Asterisks indicate a significant difference from the control (**P  < 0.01). Experiments were run in three replicates; the presented data are the average of these replicates ± standard deviation