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Growth ofTetrahymena pyriformis W has been used to evaluate nutritional quality of peanut and cottonseed meals. An efficient elutriation method is described for separating cells of this organism from particulate matter left in the substrate (enriched with basal medium) after 4 days of incubation. After elutriation the cells can be counted with a Coulter counter by using calibration procedures which are presented. Elutriation and Coulter counting provide a rapid and efficient method of measuring the growth response ofT. pyriformis W. Utility of the method is demonstrated by agreement between Coulter counts and visual counts of the cells and by demonstration of a linear response of cell numbers to substrate nitrogen.

Elutriation and Coulter Counts of Tetrahymena pyriformis Grown in Peanut and Cottonseed Meal Media