Different carbon and nitrogen sources also significantly influenced on the growth and antagonistic activity of J12 (Fig. 3c and d). The effect of carbon and nitrogen sources on the antagonistic activity of J12 was identical to that on J12 growth in most cases. J12 expressed highest biomass (OD600 = 0.77) and antagonistic activity (25.3 mm) in the presence of glucose. The lowest biomass (OD600 = 0. 12) and antagonistic activity (13 mm) were observed in the presence of lactose (Fig. 3)