title: [Do the variations in water carbon dioxide pressure and PH have an effect on the nature of end products of protein catabolism, ammonia and urea, in the clawed frog Xenopus laevis?].
abstract: The effects of PCO2 and pH changes in the ambient water on the nitrogen catabolism and the proportions of the excreted nitrogenous end products, ammonia and urea, were studied in the clawed frog, Xenopus laevis, at 24 degrees C. In animals living in artificial fresh water, the exposure to a hypocapnic alkalosis (PCO2 = 0.7 Torr instead of 10 Torr) did not entail any change in the nitrogen catabolism. In animals who lived in a water loaded with NaCl and had therefore a higher oxygen consumption, an intense nitrogen catabolism and a marked ureotelism, the hypocapnic alkalosis seems to have increased the intensity of the nitrogen catabolism. In neither group were there signs of ammonia toxicity.
authors.affiliation: C.N.R.S., Laboratoire d'Etude des Régulations physiologiques, Strasbourg.
authors.forename: P
authors.initials: P
authors.lastname: Dejours
authors.forename: J
authors.initials: J
authors.lastname: Armand
authors.forename: H
authors.initials: H
authors.lastname: Beekenkamp
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D000818:Animals; D002245:Carbon Dioxide / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000378:metabolism*; D011312:Pressure; D014508:Urea / Q000378:metabolism*; D014867:Water / Q000032:analysis*; D014982:Xenopus laevis / Q000378:metabolism*
chemical_list: D014867:Water; D002245:Carbon Dioxide; D000641:Ammonia; D014508:Urea; D009584:Nitrogen
vernacular_title: Les variations de la pression du dioxyde de carbone et du pH de l'eau ont-elles une action sur la nature des produits terminaux du catabolisme protéique, ammoniac et urée, chez un amphibien anoure Xenopus laevis?