Incubation period Total cell counts cells/ml Nisin activityIU/ml Specific nisin activity IU/109 cells/ml Difference rate of specific activity Lactococcus lactis strain 729, type A Lactococcus lactis strain 729, type B 1day (24 hours) 1.6 ± 0.2×109 2800 1806 21.2 6.6 ± 0.7×107 2450 38281 2 days 1.7 ± 0.2×109 3250 1626 41.3 3.7 ± 0.4×107 2500 67204 3 days 1.6 ± 0.4×109 2450 1531 26.6 6.6 ± 0.7×107 2700 40909 7 days 1.6 ± 0.2×109 2750 1676 22.9 7.0 ± 0.8×107 2700 38352 10 days 1.8 ± 0.2×109 3000 1523 37.7 4.9 ± 0.5×107 2800 57377 3 months 2.6 ± 0.3×109 1332 510 78.2 6 ± 0.7×107 2400 39867 4,5 months 3.8 ± 0.4×109 985 262 77.1 5.8 ± 0.6×107 1166 20207 1 year 4.4 ± 0.5×108 2450 5518 10 4.4 ± 0.5×107 2450 55180

Table 5: Dynamics of nisin activity in populations of the strain of Lactococcus lactis 729 under the conditions of a trophic stress.