title: [Nitrogen excretion of Helix aspersa Müller (Mollusca Gastropoda Pulmonata)].
abstract: Helix aspersa, studied in Brittany, has not a complete uricolytic enzymatic chain. Allantoïnase and allantoïcase are absent, but, in vitro, uricase and urease are very active. A part from uric acid, Helix aspersa shows a high rate of urea and ammonia. The level of these substances is dependant on the age of the snail and on its physiological state.
mesh_terms: D000375:Aging; D000641:Ammonia / Q000378:metabolism; D000818:Animals; D006372:Helix, Snails / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D012621:Seasons; D014503:Urate Oxidase / Q000378:metabolism; D014508:Urea / Q000378:metabolism; D014510:Urease / Q000378:metabolism; D014527:Uric Acid / Q000378:metabolism
chemical_list: D014527:Uric Acid; D000641:Ammonia; D014508:Urea; D014503:Urate Oxidase; D014510:Urease; D009584:Nitrogen
vernacular_title: Contribution a l'étude de l'excrétion azotée chez Helix aspersa Müller (Mollusque gastéropode pulmoné).