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- W2523999679 abstract "ABSTRACT An analysis, more extensive than hitherto, has been made of nitrogen excretion in developing chicks. It was found that the concentration of ammonia in the allantoic fluid was constant from the 5th to the 11th day and equalled the concentration in the extra-allantoic fluids, e.g. yolk. The increase into total ammonia content of the allantois during development is apparently due to the increase in volume of the organ and not to excretion by the embryo. The concentration of urea in the allantoic fluid increases during development and injected urea concentrates in that organ. The total amount and concentration of uric acid in allantoic fluid increases during development. The ratio of urea nitrogen to uric-acid nitrogen is relatively constant from the 6th to the 11th day of development indicating that no major shift from urea excretion to uric-acid excretion occurs. No urease activity was observed even in the blastodiscs of unincubated eggs. The distribution of arginase activity in 7-day-old chicks did not resemble that of ureotelic organisms. Activity of heads, bodies, and livers were essentially the same. From these results it was concluded that ammonia is not an excretion product and that the developing chick does not pass through either a typical ammonotelic or ureotelic stage of excretion." @default.
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- W2523999679 date "1957-09-01" @default.
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- W2523999679 title "Nitrogen Excretion in Developing Chick Embryos" @default.
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- W2523999679 doi "https://doi.org/10.1242/dev.5.3.215" @default.
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