Fig. 9.

E. coli bacteria stained with SYTO 9 (considered alive, green) and propidium iodide (considered dead, red) incubated in presence of 200 μΜ free TPyCP after 0 min (a), 30 min (b), 120 min (c), 240 min (d) and 360 min (e) of illumination under red LED light (λ _max = 660 nm)