Figure 3.

Correlations between autoinducer production and quorum-sensing dependent phenotypes. Relations between levels of 3-oxo-C₁₂-HSL and elastase production by P. aeruginosa isolates recovered from tracheal aspirations (A), and adhesion capacity (B) as well as biofilm formation (C) by P. aeruginosa isolates recovered from intubation devices. (A) For each isolate the production of 3-oxo-C₁₂-HSL and elastase was measured in aliquots taken at the same time during the growth curve, and plotted against each other. (B and C) For each isolate aliquots for 3-oxo-C₁₂-HSL determinations were taken at an identical time during the growth curve. Adhesion capacities and biofilm formation are expressed compared to wild type strain PT5 (100%). Each determination is the mean of two independent experiments performed in triplicate.