The three isolates that showed the highest antimicrobial and hemolytic activities: RAB7, R14 and C116, were selected for fermentation studies. Figure 1 shows biomass production, glucose consumption and antimicrobial activity production during the growth of the three isolates. B. megaterium pv. cerealis RAB7 and B. subtilis R14
had a longer growth phase then B. megaterium C116, but in all cases the antimicrobial activity production was observed at the late growth phase. The antimicrobial activities in liquid medium were similar to that observed on solid medium, where the isolates R14 and RAB7 produced wider inhibition zones then C116.