Figure 6.

Attenuation of pathogenicity of P. aeruginosa by the filtrate of cultured P. mirabilis. (a) Elastase activity; (b) siderophore production; (c) alkaline phosphatase production; (d) β-glycosidase production; (e) aminopeptidase production; (f) lipase production. Cultures of P. aeruginosa were incubated in LB medium with or without the filtrate of cultured P. mirabilis. A well-known QSI (20 µg ml⁻¹ furanone) was used as a positive control. NC, negative control; FC, filtrate of cultured P. mirabilis; PC, positive control (20 µg ml⁻¹ furanone). *p < 0.05, **p < 0.01 and ***p < 0.001.