Urea production capacity in the wood frog (Rana sylvatica) varies with season and experimentally induced hyperuremia
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چکیده
منابع مشابه
Urea production capacity in the wood frog (Rana sylvatica) varies with season and experimentally induced hyperuremia.
Wood frogs (Rana sylvatica) can accumulate substantial amounts of urea during fall and winter. In this study, maximal urea production capacity was examined in R. sylvatica collected at various times of the year and in response to experimental hyperuremia and dehydration. Activity and expression of carbamoyl phosphate synthetase I (CPS I), the hepatic regulatory enzyme of the urea cycle, were us...
متن کاملMetabolic depression induced by urea in organs of the wood frog, Rana sylvatica: effects of season and temperature.
It has long been suspected that urea accumulation plays a key role in the induction or maintenance of metabolic suppression during extended dormancy in animals from diverse taxa. However, little evidence supporting that hypothesis in living systems exists. We measured aerobic metabolism of isolated organs from the wood frog (Rana sylvatica) in the presence or absence of elevated urea at various...
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Prior studies have shown that macrogeographic gradients in temperature associated with latitude and altitude can lead to countergradient patterns of variation in a number of taxa: individuals from colder environments are known to grow or develop faster than their conspecifics from warmer environments when placed in a common setting. In this study, I hypothesized that countergradient variation a...
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Rising ultraviolet-B (UVB, 280-320 nm) radiation has been proposed as a factor which may explain nonnormal amphibian population declines. Accordingly research has been directed toward estimating the photolyase activity of several amphibian species in order to predict a species' resilience to UV damage. Unfortunately, in spite of published research which demonstrated that the activity of one of ...
متن کاملExpression and Characterization of the Novel Gene fr47 during Freezing in the Wood Frog, Rana sylvatica
The wood frog, Rana sylvatica, has numerous adaptations that allow it to survive freezing of up to 65% of its total body water during the winter. Such adaptations have been found to include the expression of novel freeze responsive genes that are thought to be important for adaptation and survival. In this study, the tissue-specific stress responsive expression of one novel gene, fr47, was asse...
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ژورنال
عنوان ژورنال: Journal of Experimental Zoology Part A: Ecological Genetics and Physiology
سال: 2008
ISSN: 1932-5223,1932-5231
DOI: 10.1002/jez.479