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Biosynthesis of urea in the estivating African lungfish and in xenopus laevis under conditions of water-shortage

1968; Pergamon Press; Volume: 24; Issue: 3 Linguagem: Inglês

10.1016/0010-406x(68)90800-1

1879-3029

P.A. Janssens, Philip P. Cohen,

Marine Bivalve and Aquaculture Studies

1. The rate of urea synthesis and the activity of ornithine-urea cycle enzymes were similar in unfed and estivating African lungfish. 2. In Xenopus laevis, carbamul phosophate synthase activity decreased following starvation when the rate of urea biosynthesis decreases, and increased during maintenance in 0·9% saline or moist peat when urea biosynthesis increases. 3. It appears that the activity of ornithine-urea cycle enzymes is indicative of the rate of ureogenesis.