Figure 4: Sub-MICs effects on QS by β-galactosidase activity: PA-13572 samples were treated with 1/16, 1/8 and 1/4 MICs of both F-NAC and L-NAC, supernatants were collected and incubated with A. tumefaciens (A136) and β-galactosidase activities were calculated in miller units for three independent experiments each were prepared in triplicates. These data represents the mean ± S.E.M. for the three experiments, P values were considered significant when compared to control: ***P<0.001.