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Titolo:
Hydrostatic-pressure and temperature effects on the molecular order of erythrocyte membranes from deep-, shallow-, and non-diving mammals
Autore:
Williams, EE; Stewart, BS; Beuchat, CA; Somero, GN; Hazel, JR;
Indirizzi:
Oregon State Univ, Dept Zool, Corvallis, OR 97331 USA Oregon State Univ Corvallis OR USA 97331 pt Zool, Corvallis, OR 97331 USA Hubbs Sea World Res Inst, San Diego, CA 92109 USA Hubbs Sea World Res Inst San Diego CA USA 92109 , San Diego, CA 92109 USA US Dept State, Off Marine Conservat, Bur Oceans & Int Environm & Sci Affairs, Washington, DC 20250 USA US Dept State Washington DC USA 20250 i Affairs, Washington, DC 20250 USA Univ Arizona, Coll Med, Dept Physiol, Tucson, AZ 85724 USA Univ Arizona Tucson AZ USA 85724 Med, Dept Physiol, Tucson, AZ 85724 USA Arizona State Univ, Dept Biol, Tempe, AZ 85287 USA Arizona State Univ Tempe AZ USA 85287 niv, Dept Biol, Tempe, AZ 85287 USA
Titolo Testata:
CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE
fascicolo: 5, volume: 79, anno: 2001,
pagine: 888 - 894
SICI:
0008-4301(200105)79:5<888:HATEOT>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
FATTY-ACID COMPOSITIONS; NORTHERN ELEPHANT SEAL; CENTRAL NERVOUS-SYSTEM; VITRO COLD-EXPOSURE; LIPID-COMPOSITION; NEUROLOGICAL SYNDROME; ST-LAWRENCE; ADAPTATION; BEHAVIOR; FLUIDITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Williams, EE Salisbury State Univ, Dept Biol Sci, 1101 Camden Ave, Salisbury, MD 21801 USA Salisbury State Univ 1101 Camden Ave Salisbury MD USA 21801 A
Citazione:
E.E. Williams et al., "Hydrostatic-pressure and temperature effects on the molecular order of erythrocyte membranes from deep-, shallow-, and non-diving mammals", CAN J ZOOL, 79(5), 2001, pp. 888-894

Abstract

Little is known about the cellular mechanisms involved in the tolerance ofdeep-diving marine mammals to hydrostatic pressures that cause serious pathologies when experienced by other mammals. We compared fatty-acid composition, cholesterol content, and the effects of pressure on the molecular order of erythrocyte membranes from deep-, shallow-, and non-diving mammals to determine how these properties may be related to diving performance. Erythrocytes were collected from two deep-diving phocid pinnipeds (northern elephant seal (Mirounga angustirostris) and harbor seal (Phoca vitulina)), a relatively shallow-diving otariid pinniped (northern fur seal (Callorhinus ursinus)), and several nondiving terrestrial mammals (dog (Canis familiaris), horse (Equus caballus), and cow (Bos taurus)). Fatty-acid composition clearly distinguished the phocids from the other species. The monoene content oferythrocyte membranes was substantially lower (3 vs. approximately 20%), whereas the lipid unsaturation indices, the ratio of alpha- to gamma-linolenic acids, and the proportions of long-chain polyunsaturated fatty acids were substantially higher in the phocids. The cell-membrane cholesterol content was also significantly lower in erythrocytes from the deep-diving phocids(cholesterol:phospholipid ratios 0.2-0.3) than from most other mammals (1.0). Membranes from the phocids were more ordered than those from the shallow- and non-divers, and were also more sensitive to changes in pressure and temperature. The physiological significance of these differences in cell-membrane structure, which affect the order and sensitivity of cell membranes to hydrostatic pressure, is unknown, but they may be important adaptations that allow repeated and prolonged exposure to great hydrostatic pressure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 03:35:02