Figure 4.
Bacterial density expressed as log CFU mL−1 of Staphylococcus aureus ATCC® 6538, after 24 h of incubation with 625, 1250, and 2500 µg mL−1 of Salix atrocinerea Brot., Salix fragilis L., and Salix viminalis L. bark polar extracts. Growth bacterial control is also depicted. Each column and bar represents the mean and the standard deviation, respectively (n = 6). Columns with the symbol * are statistically different from the growth control (one-way ANOVA, followed by Tukey’s HSD test, p < 0.05). CFU, colony forming unit.