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The physiology of hypoxia and anoxia...

Milton, Sarah Louise.

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The physiology of hypoxia and anoxia tolerance in three species of turtle: The loggerhead sea turtle (Caretta caretta), green sea turtle (Chelonia mydas), and freshwater Trachemys scripta.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The physiology of hypoxia and anoxia tolerance in three species of turtle: The loggerhead sea turtle (Caretta caretta), green sea turtle (Chelonia mydas), and freshwater Trachemys scripta./
作者:	Milton, Sarah Louise.
面頁冊數:	209 p.
附註:	Source: Dissertation Abstracts International, Volume: 55-08, Section: B, page: 3174.
Contained By:	Dissertation Abstracts International55-08B.
標題:	Biology, Oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9500241

The physiology of hypoxia and anoxia tolerance in three species of turtle: The loggerhead sea turtle (Caretta caretta), green sea turtle (Chelonia mydas), and freshwater Trachemys scripta.
Milton, Sarah Louise.

The physiology of hypoxia and anoxia tolerance in three species of turtle: The loggerhead sea turtle (Caretta caretta), green sea turtle (Chelonia mydas), and freshwater Trachemys scripta. - 209 p.

Source: Dissertation Abstracts International, Volume: 55-08, Section: B, page: 3174.

Thesis (Ph.D.)--University of Miami, 1994.

Freshwater and sea turtles both can withstand anoxia for hours to days by reducing their metabolic rate to such a degree that physiological requirements can be fully met by anaerobic metabolism. The mechanisms that produce and coordinate this hypometabolism are of considerable interest. Similar critical oxygen pressures in two species of sea turtle with different oxygen carrying capacities indicates that low oxygen levels are signalled by decreasing oxygen partial pressure rather than low blood oxygen content. However, the energy from anaerobic glycolysis, rather than from oxidative phosphorylation, is critical to establish and maintain the hypometabolic state.Subjects--Topical Terms:

783691
Biology, Oceanography.

The physiology of hypoxia and anoxia tolerance in three species of turtle: The loggerhead sea turtle (Caretta caretta), green sea turtle (Chelonia mydas), and freshwater Trachemys scripta.
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245 1 4 $a The physiology of hypoxia and anoxia tolerance in three species of turtle: The loggerhead sea turtle (Caretta caretta), green sea turtle (Chelonia mydas), and freshwater Trachemys scripta.
300 $a 209 p.
500 $a Source: Dissertation Abstracts International, Volume: 55-08, Section: B, page: 3174.
500 $a Supervisor: Peter Lutz.
502 $a Thesis (Ph.D.)--University of Miami, 1994.
520 $a Freshwater and sea turtles both can withstand anoxia for hours to days by reducing their metabolic rate to such a degree that physiological requirements can be fully met by anaerobic metabolism. The mechanisms that produce and coordinate this hypometabolism are of considerable interest. Similar critical oxygen pressures in two species of sea turtle with different oxygen carrying capacities indicates that low oxygen levels are signalled by decreasing oxygen partial pressure rather than low blood oxygen content. However, the energy from anaerobic glycolysis, rather than from oxidative phosphorylation, is critical to establish and maintain the hypometabolic state.
520 $a Other metabolic effecting metabolites help to control and coordinate metabolic downregulation in freshwater turtles. With the exception of the brain, these metabolites have not been previously examined in an anoxia tolerant species. Using microdialysis to relate changes in skeletal muscle and liver extracellular metabolite levels to changes occurring within the tissues and in the plasma, I found that tissue, extracellular fluid (e.c.f.), and plasma glucose and lactate levels remained in equilibrium during normoxia. This equilibrium disappeared during anoxia. Measurements of free amino acid pools showed that taurine was released into the muscle and liver extracellular space and plasma during anoxia, as was alanine. This study showed that Trachemys scripta can produce alanine as an alternative end product during anoxia, but the energy produced is insufficient to establish or maintain the hypometabolic state. Anoxia also stimulated muscle cells, but not the liver, to increase production and/or release of adenosine into the e.c.f. All of these changes in extracellular metabolites were pulsatile in nature, indicating that the release and uptake of bioactive substances is more dynamic than has been previously assumed. These cyclic changes may be due to changes in microcirculation or to transport mechanisms at the tissue or endothelial cell barriers.
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