CONTINUOUS RECORDING OF CELL NUMBER IN LOGARITHMIC AND SYNCHRONIZED CULTURES.

An instrument for the continuous recording of cell number has been developed and is being used to record changes in populations of logarithmic and synchronized cultures of protozoan flagellates. A Coulter cell counter is used in conjunction with a counting chamber that is fitted with a flexible polyethylene aperture (75 micro in diameter). This aperture rarely becomes blocked and appears to be self-clearing. The unit consists of a proportioning pump, a cell counter, a counting chamber, a rate meter, and a recorder.