Figure 2.

CFU reduction of different E. coli strains in response to blue light irradiation (BLI)₄₅₅ at different growth phases. (a) Comparison of CFUs for unexposed (solid colored bars) and exposed (white bars) samples during exponential, transition, and stationary growth phases. All experiments were repeated a minimum of three times and analyzed via a Student t test. *, p < .05, **, p < .01; ***, p < .001; ****, p < .0001. (b) Comparison of percent reduction of CFUs with analyses of the changes over growth phases. The following strains are represented: phylogenetic group A strains DH5α (laboratory‐adapted) and MG1655 (K‐12); group B1 strains E343 and E402 (nonpathogenic isolates); group B2 UPEC strains UTI89 and EC958 (multi‐drug resistant); group D ETEC strain E9034A; and group E EHEC O157:H7 strain Sakai. Data represent the mean of three or more independent experiments. All experiments were repeated a minimum of three times and analyzed via One‐way anova. *, p < .05; ***, p < .001