Effect of monounsaturated fatty acid (MUFA) (A–F) on the metabolic activity of selected bacterial species: Enterococcus faecalis, Staphylococcus aureus PCM 458, Streptococcus pyogenes PCM 2318, Pseudomonas aeruginosa, mixed two species culture—Enterococcus faecalis and Pseudomonas aeruginosa. Twelve water or ethanol extracts with defined concentrations of 1 mg·mL−1, 100 µg·mL−1 and 10 µg·mL−1 (black dots) were considered. WT cells are marked with a red dot. Results represent the mean from three independent experiments. The 95% confidence interval is shown. Correlation analysis of the data was performed using a Linear Correlation (Pearson r) test.