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  • Title: The cultivation of the rumen ciliate Entodinium bursa in the presence of Entodinium caudatum.
    Author: Coleman GS, Laurie JI, Bailey JE.
    Journal: J Gen Microbiol; 1977 Aug; 101(2):253-8. PubMed ID: 411886.
    Abstract:
    The rumen ciliate protozoon Entodinium bursa has been grown in vitro in the presence of bacteria and Entodinium caudatum for over a year at population densities of 100 to 200 ml-1. The medium contained potassium phosphate, prepared fresh rumen fluid, cysteine, wholemeal flour (or rice starch), dried grass and a culture of the spineless form of Entodinium caudatum. Entodinium bursa has an obligate requirement for this protozoon and died within 48 h in its absence. During growth from a 2% inoculum, the mean generation time of E. bursa was 6 h. Entodinium bursa engulfed 1-5 to 2-5 E. caudatum organisms h-1, and when E. caudatum was in excess it developed caudal spines for the first time in 17 years; these spined forms were engulfed much less readily than the spineless organisms.
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