uricotelism

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uricotelism

[‚yu̇r·ə′käd·əl‚iz·əm]
(physiology)
An adaptation of terrestrial reptiles and birds which effectively provides for detoxification of ammonia and also for efficient conservation of water due to a relatively low rate of glomerular filtration and active secretion of uric acid by the tubules to form a urine practically saturated with urate.
References in periodicals archive ?
In uricotelic species, the mitochondrial enzyme that exerts a parallel function is glutamine synthetase; however, in the end of the cycle, only uric acid is produced, which is Arg-independent.
All these reactions depend on the intracellular concentration of Arg, which is determined by two paths: 1) the synthesis of Arg from other substrates, in the case of uricotelic species, citrulline, a mechanism that is little efficient in organic homeostasis conditions, and/or 2) the transport of Arg from the extracellular medium to intracellular compartments, a mechanism that depends on the availability of dietary Arg and the regulation of the synthesis of proteins.
catesbeiana is an ureotelic rather than uricotelic amphibian.
Contrary to their close relatives (reptilians and birds) which are uricotelics, adult R.