Fig. 2

Appearance of 260-nm-absorbing material in the filtrates of V. cholerae SG24 (1), PC2, NB2 and CO6 after treatment with compounds 1, 2 and 4. Bars represent the mean ± standard deviation of the triplicate OD at each incubation time. At the same incubation time, letters a-d indicate significant differences between samples according to one way ANOVA and Waller Duncan test; p < 0.05