Determination of Verhulst constants: a D1, data 1 (50 ml) for cell line CHOK1 SV, KV-PB, carrying capacity (16.50 Ln VCD/ml), rV-PB, intrinsic growth factor (0.0165 h−1); b D1, data 1 (50 ml) for cell line CHOK1 SV, KV-MAb, carrying capacity (6.29 Ln MAb/ml), rV-PB, intrinsic productivity factor (0.0365 h−1)