Figure 3.

Na⁺ and K⁺ concentrations of P. megaterium ZS-3 in the presence of different salt concentrations: (a) Na⁺ concentration; (b) K⁺ concentration; and (c) K⁺/Na⁺. ZS-3 was grown in different media for 48 h, and then the supernatant was collected by centrifugation to determine the ion concentration in vitro. The precipitated cells were broken by ultrasound and centrifuged again, and the supernatant was used to determine the ion concentrations in vivo. LB medium without bacterial inoculum was used as a control. Values represent the means of three biological experiments, each in three technical replicates. Error bars represent SE.