Abstract

Cryptobia salmositica multiplied rapidly at 10 C in a minimum essential medium (containing 1.0 mg glucose/ml, Hanks' salts and L-glutamine) supplemented with heat-inactivated fetal bovine serum (FBS) and HEPES buffer (25 mM). The multiplication rate of C. salmositica was related to the amount of FBS; the peak number (approximately 9 x 10(6) parasites/ml) was attained in about 6 wk when the medium contained 25% final concentration of FBS. Glucose utilization was related to the number of parasites; the maximum utilization was reached before peak numbers. Formation of rosette colonies was correlated with multiplication rate and numbers of parasites in cultures. Degenerate round forms found in old cultures probably were caused by the accumulation of metabolic wastes in the medium.

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