Ammonotely in a neotropical frugivorous bat as energy intake decreases.
- MedicineThe Journal of experimental biology
By favoring ammonia production over urea, bats on the energy-poor diet may save up to 1% of their basal metabolic rate, which is inversely related to energy intake, but they were not related to N intake.
Can birds be ammonotelic? Nitrogen balance and excretion in two frugivores
- Environmental ScienceJournal of Experimental Biology
Two non-exclusive mechanisms for the post-renal modification of urine in these birds are suggested: bacterial catabolism of uric acid and reabsorption of Uric acid in the hindgut and birds might benefit from its re absorption.
Are Hummingbirds Facultatively Ammonotelic? Nitrogen Excretion and Requirements as a Function of Body Size
- Environmental Science, BiologyPhysiological and Biochemical Zoology
The results support the hypothesis that nectar‐feeding birds have low protein requirements but cast doubt on the notion that they are facultatively ammonotelic, and hint at a possible size‐dependent dichotomy in hummingbirds.
Ammonotely in a passerine nectarivore: the influence of renal and post-renal modification on nitrogenous waste product excretion.
- Environmental ScienceThe Journal of experimental biology
It is suggested that ammonotely may not be a unique feature of nectarivorous birds and could occur in any species in which breakdown of urate in the hindgut allows the uric acid-nitrogen concentration in the excreta to fall below that of the ammonia-Nitrogen concentration.
The Influence of Ambient Temperature and the Energy and Protein Content of Food on Nitrogenous Excretion in the Egyptian Fruit Bat (Rousettus aegyptiacus)
- Materials SciencePhysiological and Biochemical Zoology
Both the absolute quantity and the fraction of ammonia in the bats’ urine increased significantly with food intake and food intake decreased exponentially with increasing sucrose concentration.
Transport of Organic Substances by Renal Tubules
- Environmental Science
The excretion of numerous organic substances is regulated by renal tubular transport. For a few of these substances, enough information is now available on the transport processes in nonmammalian…
Comparative Physiology of the Vertebrate Kidney
- Biology, Environmental ScienceSpringer New York
The Comparative Approach helps clarify the role of kidneys in Regulating the Water and Solute Composition of the Internal Environment and provides a framework for future studies of Renal Morphology.
Osmoregulation and excretion.
- Biology, Environmental ScienceComprehensive Physiology
How knowledge in these areas of comparative physiology has expanded considerably during the last two decades is demonstrated, bridging seminal classical works with studies based on new approaches at all levels of anatomical and functional organization.
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Oxygen Consumption of Torpid, Resting, Active, and Flying Hummingbirds
- BiologyPhysiological Zoology
This investigation was supported, in part, by grant G-9238 from the National Science Foundation to Dr. W. R. Dawson, and by funds from the Graduate Student Research Fund, Horace H. Rackham School of Graduate Studies, University of Michigan.
The Integration of Osmoregulation and Energy Balance in Hummingbirds
- Environmental Science, BiologyPhysiological Zoology
The hummingbird is a unique animal: its kidney appears to be structurally similar to that of a reptile, but its rate of waterflux is more typical of an amphibian; it sustains a metabolic level as high as that of any endotherm.
The effects of dietary protein content on water requirements and ammonia excertion in pigeons,Columbia livia
Nitrogen Metabolism and Excretion
- Biology, Environmental Science
Protein Turnover in Animals, D.F. Wright and D.A. Wright Uptake and Effects of Nitrite and Nitrate in animals, F.B.D. Dantzler Urea Synthesis in Mammals, A.J. Meijer Urea and Ammonium Transport in the Mammalian Kidney, M.M.
Nitrogen Excretion by Turkey Vultures
- Environmental Science
Investigation of nitrogen excretion in a carnivorous species, the Turkey Vulture, found an adaptive increase in the percentage of urinary N excreted as urate and a decrease in NH3-N and urea-N in the period after feeding on meat, which increases the efficiency of N excretion.
On the temperature-dependency of optimal nectar concentrations for birds.
- Environmental ScienceJournal of theoretical biology
Nitrogenous excretion in Chelonian reptiles.
- Biology, ChemistryThe Biochemical journal
Bates, R. W. (1937). J. biol. Chem. 119, vii. Bawden, F. C. & Kleczkowski, A. (1941). Brit. J. exp. Path. 22, 208. Bawden, F. C. & Kleczkowski, A. (1942a). Brit. J. exp. Path. 23, 169. Bawden, F. C.…
The renal excretion of nitrogenous compounds by the duck (Anas platyrhynchos) maintained on freshwater and on hypertonic saline.
- Environmental Science, BiologyThe Journal of experimental biology
The urea:inulin clearance ratios for the individual urine samples from all birds suggested that renal tubular synthesis and secretion of urea may occur and may be interpreted as a reliable measure of the renal plasma flow rate.