Abstract
The work reported here is a continuation of a study of the catabolic nitrogenous products of parasitic larvae living under axenic conditions. Previous papers have described the results obtained with certain nematode larvae (Weinstein and Haskins, 1955; Haskins and Weinstein, 1957a, b, c). This report extends the observations to another class, the Cestoda. Apparently there is no published information concerning the nitrogenous products released by cestodes into the ambient medium. However, urea, uric acid, creatinine, and betaine have been found in Echinococcus cyst fluid (Mazzocco, 1923; Fl6ssner, 1925; Lemaire and Ribere, 1935; Codounis and Polydorides, 1936); ammonia has been found in the tissues of Moniezia expansa (van Grembergen and Pennoit-DeCooman, 1944); Schopfer (1932) reported urea and uric acid from the cyst fluid of Cysticercus tenuicollis; and Salisbury and Anderson (1939) found ammonia, urea, and uric acid in the tissue of larval Taenia taeniaeformis (Cysticercus fasciolaris).
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