title: Growth of isolated amastigotes of Trypanosoma cruzi in cell-free medium.
abstract: Amastigotes of Trypanosoma cruzi were purified from overlays of infected Vero cell cultures by centrifugation over a discontinuous gradient of metrizamide. Pure amastigote preparations were usually recovered from the pellet under the layer of specific gravity 1.086. The isolated amastigotes grew in cell-free ML-15HA medium. Growth rate for the different strains of T. cruzi were in the order Y greater than Tulahuen greater than CL. The generation time of amastigotes in ML-15HA medium was 16.8, 18.0 and 26.4 h for the Y, Tulahuen, and CL strains, respectively, in the presence of 5% CO2, and 16.8, 31.2, and 36.4 h, respectively, in the absence of CO2. Intracellular amastigotes did not differ ultrastructurally from amastigotes from either the density-gradient fractionation or culture in cell-free medium.
mesh_terms: D000818:Animals; D002245:Carbon Dioxide / Q000494:pharmacology; D002460:Cell Line; D002522:Chlorocebus aethiops; D003470:Culture Media; D007700:Kinetics; D014349:Trypanosoma cruzi / Q000254:growth & development* / Q000302:isolation & purification / Q000648:ultrastructure; D014529:Uridine / Q000378:metabolism
chemical_list: D003470:Culture Media; D002245:Carbon Dioxide; D014529:Uridine