Figure 4.
(A) The growth situation of S. epidermidis in different treatment groups before (a, b, c, d) and after (e, f, g, h) irradiation for 48 hours. The TBO-mediated PDT group (h) showed obvious growth inhibition after irradiation; (a, e) control group, (b, f) TBO-only group, (c, g) red light only, (d, h) TBO-mediated PDT group. (B) The number of colonies of survival bacteria in the different experimental groups (T, TBO; L, red light; irradiance, 5.27 mW/cm2; irradiation duration, 30 minutes; TBO concentration, 60 μM).