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Titolo:
Hyperosmotic volume regulation in the gills of the ribbed mussel, Geukensia demissa: rapid accumulation of betaine and alanine
Autore:
Deaton, LE;
Indirizzi:
Univ Louisiana, Dept Biol, Lafayette, LA 70504 USA Univ Louisiana Lafayette LA USA 70504 Dept Biol, Lafayette, LA 70504 USA
Titolo Testata:
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
fascicolo: 2, volume: 260, anno: 2001,
pagine: 185 - 197
SICI:
0022-0981(20010601)260:2<185:HVRITG>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH SALINITY ADAPTATION; AMINO-ACID ACCUMULATION; GLYCINE BETAINE; ALDEHYDE DEHYDROGENASE; OSMOTIC-STRESS; MYTILUS-EDULIS; CHESAPEAKE BAY; CELL-VOLUME; BIVALVE MOLLUSKS; ESCHERICHIA-COLI;
Keywords:
osmoregulation; volume regulation; physiology; bivalve; mollusc;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Deaton, LE Univ Louisiana, Dept Biol, Lafayette, LA 70504 USA Univ Louisiana Lafayette LA USA 70504 Lafayette, LA 70504 USA
Citazione:
L.E. Deaton, "Hyperosmotic volume regulation in the gills of the ribbed mussel, Geukensia demissa: rapid accumulation of betaine and alanine", J EXP MAR B, 260(2), 2001, pp. 185-197

Abstract

The content of betaine and alanine in gills of the ribbed mussel Geukensiademissa increases rapidly following transfer of the tissues from 250 to 1000 mOsm seawater (SW). Increases in alanine, proline and glycine account for most of the increase in the amino acid pool. The betaine content increases from 45 to 150 mu mol/g dry weight within 12 h. Transfer of isolated gills from 250 to 1000 mOsm SW results in a temporary cessation of all ciliary activity. Within 20-40 min following transfer, ciliary activity has recovered. Recovery of ciliary activity precedes recovery of tissue hydration. Theuric acid content of gills is unchanged by exposure to hyperosmotic media,suggesting that uric acid is not a store of nitrogen for alanine synthesisfrom pyruvate. In other organisms, the accumulation of betaine in responseto hyperosmotic stress is a slow (days to weeks) process that probably involves changes in gene expression. The rapid, large increases in betaine reported here suggest that gene expression is not a factor in volume recovery by euryhaline bivalve tissues exposed to acute hyperosmotic stress. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 29/09/20 alle ore 22:54:10