Fig. 4. Effects of l-lysine on Chl-a and protein levels in M. aeruginosa cells. Cells were treated with 0.5, 3.0, 5.0, 6.5, and 8.0 mg L−1l-lysine. Cells not treated with l-lysine served as a control. Data presented are expressed as the mean ± standard deviation. Significant differences between the test and control groups are indicated by asterisks, *when p < 0.05, and **when p < 0.01.
