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The Stimulation of the Ornithine Cycle of Xenopus Laevis Daudin By Ammonia in the Environment

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

1. Xenopus laevis, placed in 0.04 M NH4CI at a pH 7.8 for 72 hours, showed a 4-9 fold increase in the amount of excreted urea. The extent of this increase is proportional to the ammonia concentration. 2. This increase did not appear, or to a much lesser extent, in 0.04 M NaCl or in 0.04 M NH4Cl at pH 6.8. 3. The rise in the urea excretion went together with an increase in the activity of the enzymes of the ornithine cycle. Carbamyl phosphate synthetase and arginase rose to threefold of the normal activity, the other enzymes to less than twofold. 4. The significance of the above observations for the explanation of the start of the aestivating period of Xenopus laevis is discussed.

Affiliations: 1: (Laboratory of Chemical Animal Physiology, ,State University, Utrecht, The Netherlareds


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