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Presentation of positive and negative controls during semi-quantitative QS-inhibition assay, using parallel inoculation disk diffusion method, Left: C. violaceum CV026 and Sphingomonas paucimobilis Ezf 10–17 (one effective compounds can be observed in the lower right corner); Right: S. marcescens AS-1 (two effective compound can be observed on the left side and center).Activity is represented as discolored bacterial colonies with no detected growth inhibition.
