著者

有馬 四郎

出版者

社団法人日本動物学会

雑誌

動物学雑誌 (ISSN:00445118)

巻号頁・発行日

vol.61, no.9, pp.275-277, 1952-09-15

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The composition of urine of Rhacophorus schlegelii var. arborea and Rana nigromaculata taken from the bladder was qualitatively analysed, in order to compare with that of the fluid in the peri-vitelline space of the early empryos of Rhacophorus schlegelii var. arborea. RICHARD, BORDLEY, WALLKER and HEUDRIX ('33) verified the existence of uric acid, phosphate, creatinine and chlorine, but not the other organic and inorganic constituents in the urine of Rana pipiens. The present study of analysing the urine of Rana nigromaculata reveals the presence of sodium-ion, chlorine-ion, potassium-ion, phosphate-ion, sulphate-ion, calcium-ion and ammonium-ion, and besides them, nitrate-ion and nitrite-ion in the case of Rhacophorus-urine as the inorganic constituents. As the organic substances, the urine of the two species contains uric acid and urea, but not any trace of creatinine so far as the WEYL reaction is consulted. The urine of Rana nigromaculata in summer months contains uric acid and urea in higher concentration than in winter months. On the basis of the present analysis the chief end-product of the protein metabolism of Amphibia seems to be urea, since the uric acid is contained in much low concentration in the urine of Amphibia.