Fig. 3. Chlorophyll-a autofluorescence images of M. aeruginosa cells during treatment with different dosages of l-lysine. A control without treatment is shown in (A); 3 d treatments with l-lysine at 0.5 mg L⁻¹, 3.0 mg L⁻¹, 5.0 mg L⁻¹, 6.5 mg L⁻¹, and 8.0 mg L⁻¹ are shown in (B) to (F), respectively.