Strain of Lactococcus lactis General quantity of cells in Goryaev (Thoma) chamber CFU/ml % viable cells in population General quantity of viable cells Optical density % viable cells, but not forming colonies 7 months 10 months 7 months 10 months 7 months 10 months 7 months 10 months MSU type A 1.9 ± 0.2×109 1.5 ± 0.2×109 81.2 82.5 0.3 0.3 99.9 99.9 ------------------- ---------------------- --------------- ----------------- 3.9 ± 0.4×102 2.7 ± 0.3×103 1.5 ± 0.2×109 1.3 ± 0.1×109 MSU type B 1.9 ± 0.2×109 1.9 ± 0.2×109 50.1 38.1 1.5 1.3 99.9 99.9 ------------------- --------------------- ---------------- ----------------- 2.3 ± 0.3×104 1.0 ± 0.1×104 9.6 ± 1.1×109 1.3 ± 0.1×109 729 type A 1.6 ± 0.2×109 1.0 ± 0.1×109 86.9 93.7 0.3 0.2 99.9 99.9 ---------------------- -------------------- ---------------- ------------------ 4.9 ± 0.5×103 1.2 ± 0.1×103 1.4 ± 0.2×109 9.4 ± 1.0×108 729 type B 6.1 ± 0.7×107 4.3 ± 0.5×109 91.8 76 0.1 0.1 99.9 99.9 ---------------------- -------------------- ----------------- ------------------ 3.6 ± 0.4×104 2.7 ± 0.3×104 5.6 ± 0.6×108 3.3 ± 0.4×109 F-116    type A 2.5 ± 0.3×109 1.9 ± 0.2×109 99.9 94.6 0.5 0.4 99.9 99.9 --------------------- -------------------- ---------------- ----------------- 5.5 ± 0.6×104 2.2 ± 0.2×103 2.7 ± 0.3×109 2.4 ± 0.3×109 F-116 type B 6.5 ± 0.7×107 --------------------- 5.4 ± 0.6×107 --------------------- 99.7 --------------------- 99.9 --------------------- 0.1 0.1 99.9 99.9 4.4 ± 0.5×103 2.7 ± 0.3×104 6.4 ± 0.7×108 5.4 ± 0.6×109

Table 3: Characteristics of viability parameters of L. lactis populations in 7 and 10 months of incubation.