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Effect of GABA (10−5 M) on the global surface polarity (A) and biosurfactant production (B) of P. fluorescens MF37. The surface polarity was determined by measurement of the affinity of bacteria to hexadecane. The biosurfactant production was estimated by measurement of the surface tension of rinsing solutions of bacterial colonies grown on solid agar medium. (NS: non-significant; ★: p < 0.05).
