Journal ArticleDOI
Studies on the transition to ureotelism in the earthworm Lumbricus terrestris L.
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The hypothesis that anatomically distinct endocrine centers control the production of urea and ammonia in the earthworm has been examined and is not supported by the present data.Abstract:
The hypothesis that anatomically distinct endocrine centers control the production of urea and ammonia in the earthworm has been examined.
This hypothesis is not supported by the present data.
Ammonia output is markedly increased by a high protein diet, while the urea output is reduced by digestible carbohydrates.read more
Citations
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Responses of Leptasterias hexactis (Echinodermata: Asteroidea) to low salinity
T. C. Shirley,William B. Stickle +1 more
TL;DR: In this article, the authors measured respiration and excretion rates for Leptasterias hexactis (Stimpson, 1862) that had been gradually exposed to 30, 20 and 15‰ S.
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Responses of Leptasterias hexactis (Echinodermata: Asteroidea) to low salinity: II. Nitrogen metabolism, respiration and energy budget
T. C. Shirley,W. B. Stickle +1 more
TL;DR: The ability of L. hexactis to maintain positive SG for 3 wk in the laboratory at 20‰ S is indicative of tolerance to hyposmotic stress and may partially explain its success in habitats subjected to seasonal reductions of salinity.
Journal ArticleDOI
Beneficial Effect of Verminephrobacter Nephridial Symbionts on the Fitness of the Earthworm Aporrectodea tuberculata
TL;DR: Compared the growth, development, and fecundity of worms with and without symbionts given high (cow dung)- and low (straw)-nutrient diets, Verminephrobacter nephridial symbiont do have a beneficial effect on their earthworm host.
Journal ArticleDOI
Nitrogen metabolism in the american cockroach: an examination of whole body ammonium and other cations excreted in relation to water requirements
TL;DR: The effects of dietary nitrogen levels in relation to ammonotelism, cation excretion and water requirements were examined in the American cockroach, Periplaneta americana, and ammonium ions were found to be the major cations contained in the faeces.
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Nuclear DNA Contents of Coelacanth Erythrocytes
TL;DR: The Dipnoi have the highest levels among living vertebrates (160–285 pg), and these values are approached most closely by some (but by no means all) Amphibia, such as Necturus and Amphiuma (205 and 192 pg respectively).
References
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Journal ArticleDOI
Studies on factors affecting the levels of urea cycle enzymes in rat liver.
TL;DR: A series of studies are presented designed to elucidate in more detail the nature of factors which may possibly control the levels of this series of enzymes concerned with the biosynthesis of urea in the rat.
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The colorimetric estimation of small amounts of ammonia by the phenol-hypochlorite reaction
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Components of Nitrogenous Excreta in the Earthworms Lumbricus Terrestris, L. and Eisenia Foetida (Savigny)
TL;DR: The pattern of excretion of nitrogen compounds by Lumbricus , and especially the ratio ammonia/urea, varies with food-intake and this is the major factor found to affect the pattern.