Research Article

Effect of Tyrosol and Farnesol on Virulence and Antibiotic Resistance of Clinical Isolates of Pseudomonas aeruginosa

Table 2

Effect of farnesol and tyrosol on total protease production in Egyptian isolates of P. aeruginosa.

Isolate numberControlTyrosol effectFarnesol effect
Total protease production by the isolate (U/mL)Before normalizationAfter normalizationBefore normalizationAfter normalization


The values in the control column represent the levels of total protease production by the isolates (SD = 44.3), as determined in [27], without addition of farnesol and tyrosol. The values in the columns of tyrosol and farnesol stand for either nonnormalized values (SD = 40 and 40.5 for tyrosol and farnesol, resp.) or normalized values. The latter values indicate the percent of either decrease (negative values) or increase (positive values) in the production of total protease after normalization to untreated samples (control). All values represent the mean of three independent experiments.