Figure 3: Growth tendency of L. lactis strains in the lead-containing medium.

The L. lactis strains were inoculated into GM17 medium containing 0.1 mM lead for 20 h. The wet weight mass and optical density (OD600) of samples was measured at different time points (n = 4). The parameters are expressed as the means ± S.E.s. The asterisk indicates a significant difference at p < 0.05.