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The effect of QSI on biofilm formation and violacein. (A) The biofilm formation was inhibited by QSIs. Especially, BN2 and C7X have reduced the biofilm formation significantly whereas BN1 decreased the biofilm formation drastically (~50%). (B) The similar trend was followed in violacein production also. Though all the three QSIs reduce the violacein production, the SPL found be increased. *P < 0.05 and **P < 0.01.
