**3.7 Antibacterial activity of** *Cytisus nigricans*

*Cytisus nigricans* extracts showed weaker antibacterial activity than other tested plants. They mostly acted at the highest tested concentration (20 mg/ml). Acetone extract did not act on *Escherichia coli*. There is no statistically significant action difference between extracts (*p*<0.05).

Bacteria sensitivity to tested extracts is shown on the Figure 8. The most significant results showed the following bacteria: *Bacillus subtilis* (2.5 mg/ml, 5 mg/ml), *Staphylococcus aureus* ATCC 25923 (2.5 mg/ml, 5 mg/ml) and *Pseudomonas aeruginosa* ATCC 27853 (1.25 mg/ml, 5 mg/ml, 10 mg/ml). Growth of other bacteria was inhibited at approximately same concentration (20 mg/ml), and *Escherichia coli* also showed the resistance to *Cytisus nigricans* extracts. Antibacterial activity of this plant was tested for the first time in this study.
