The variations in the cell concentration with the cultivation time
and agitation rate are given in Fig. 8. In general, the cell growth
reached the stationary phase after t = 12 h. The highest cell concentration was obtained at MOT (CX = 2.1 g dm−3 ) and the lowest
cell concentration was attained at LOT (CX = 1.0 g dm−3 ). At HOT,
the highest cell concentration was obtained as CX = 1.31 g dm−3
indicating that higher oxygen transfer rate inhibited the cell
growth.