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Suspension Culture Growth and Subculture - Cell suspensions are clonally maintained by the routine transfer (subculture) of cells in the early stationary phase to a fresh medium. During the incubation period the biomass of the suspension cultures increases due to cell division and cell enlargement.

This continues for a limited period since the viability of cells in suspension after the stationary phase decreases due to the exhaustion of some factors or the accumulation of toxic substances in the medium.

At this stage an aliquot of the cell suspension with uniformly dispersed free cells and cell aggregates is transferred to afresh liquid medium of the original composition. The timing of a subculture is very important.

The incubation period from culture  initiation to the stationary phase is determined primarily by:

a) initial cell density,

b) duration of lag phase, and

c) growth rate of cell line.

While initiating a new suspension culture it is necessary to determine optimal cell density, proportionate to the volume of the culture medium, in order to achieve maximum growth.

Cell cultures initiated at very low densities will not grow unless the medium is enriched with the metabolites necessary to grow single cells or a small population of cells.