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Folinic acid and non-dialyzable materials in the nutrition of malaria parasites.

The extracellular survival of the malaria parasite Plasmodium lophurae was favored on the 4th day of incubation in vitro by the presence in the medium of added folinic acid at a concentration of about 5 microg. per ml. The development of the human malaria parasite P. falciparum intracellularly in suspensions of human erythrocytes was better in a medium with a high than in one with a low concentration of folic acid. In the early extracellular development of P. lophurae in vitro erythrocyte extract could be partially replaced by certain yeast protein preparations and by a non-dialyzable fraction, free from hemoglobin, prepared from duck erythrocyte extract by means of starch electrophoresis.

Animals↗

Sparing of folinic acid by thymidine.

Thymidine, which is inactive when added alone to Pediococcus cerevisiae (Leuconostoc citrovorum) 8081, was found to increase its growth in the presence of folinic acid. The addition of thymidine increased both the sensitivity of the folinic acid assay and the total growth yield. The mechanism of the synergistic effect of thymidine is briefly discussed.

Folic Acid↗