Comparison of the "mammal machine" and the "reptile machine": energy use and thyroid activity.

@article{Hulbert1981ComparisonOT,
  title={Comparison of the "mammal machine" and the "reptile machine": energy use and thyroid activity.},
  author={A. J. Hulbert and Paul L. Else},
  journal={The American journal of physiology},
  year={1981},
  volume={241 5},
  pages={
          R350-6
        }
}
Oxygen consumption of tissue slices of liver, kidney, and brain were measured at 37 degrees C to assess in vitro metabolism of tissues of Amphibolurus nuchalis and Mus musculus (a reptile and mammal with same weight and body temperature). "Sodium transport" metabolism was also assessed (with use of ouabain) in these tissues. The mammal had an in vitro tissue metabolism that was two to five times that of the reptile and its sodium transport metabolism was four- to ninefold greater. Growth of… Expand
Studies in the evolution of endothermy: mammals from reptiles
In a comparison of a single mammalian (_R. norvegicus) and reptilian species (A_^ vitticeps) of the same body weight and "preferred" body temperature,the metabolic capacity for energy production wasExpand
Evolution of mammalian endothermic metabolism: mitochondrial activity and cell composition.
TLDR
The brain, liver, kidney, heart, and skeletal muscle were significantly larger in the mammal, whereas the skin, reproductive organs, lung, and digestive tract showed no significant difference in size. Expand
A comparative study of the metabolic capacity of hearts from reptiles and mammals.
  • P. Else, A. J. Hulbert
  • Biology, Medicine
  • Comparative biochemistry and physiology. A, Comparative physiology
  • 1983
TLDR
Heart mitochondria from reptiles and mammals showed 2-fold differences in the activity of their enzymes per mg of mitochondrial protein yet showed very similar mitochondrial surface areas per cm3 of mitochondria. Expand
Endothermy of organisms and subcellular mechanisms of thermogenesis
It is generally known that mammals and birds are warm-blooded, and they are able to maintain such a state is not only in comfort, but in low and high temperature conditions. These circumstances, inExpand
Molecular activity of the sodium pump : effect of phylogeny and thyroid status
Study 1. Molecular activity of the sodium pump and membrane fatty acid composition in the nervous system of an endotherm and an ectotherm In the present study, molecular activities of the sodium pumpExpand
Molecular activity of the sodium pump: effect of phylogeny and thyroid status
Study 1. Molecular activity of the sodium pump and membrane fatty acid composition in the nervous system of an endotherm and an ectotherm In the present study, molecular activities of the sodium pumpExpand
Cold-induced changes in thyroid function in a poikilothermic mammal, the naked mole-rat.
TLDR
Thyrotrophs exhibited ultrastructural signs of increased secretory activity and low thyroid hormone concentrations may contribute substantially to the unusual thermoregulatory mode exhibited by naked mole-rats. Expand
Thyroid function in a lizard, a tortoise and a crocodile, compared with mammals.
  • A. Hulbert, C. Williams
  • Biology, Medicine
  • Comparative biochemistry and physiology. A, Comparative physiology
  • 1988
TLDR
A comparison of thyroid parameters in reptiles and mammals concluded that although the reptilian thyroid is active at high temperatures it is still considerably less active than it is in mammals. Expand
Bioenergetics of the lower vertebrates. Molecular mechanisms of adaptations to anoxia and hypoxia
TLDR
The molecular mechanisms that allow some representatives of reptiles, amphibians, and fish to survive long periods of hypoxia and anoxia are described. Expand
Hormonal regulation of hepatic glycogenolysis inAmphibolurus nuchalis, the western netted dragon: an in vitro study
TLDR
Findings indicate that the glycogenolytic actions of adrenaline are mediated primarily via β-adrenergic receptors in A. nuchalis, but that α-adrenegic receptors may also play some role in the control of hepatic metabolism. Expand
...
1
2
3
4
5
...