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Deaton LE. Hyperosmotic volume regulation in the gills of the ribbed mussel, Geukensia demissa: rapid accumulation of betaine and alanine. J Exp Mar Biol Ecol. 2001;260(2):185-197doi: 10.1016/s0022-0981(01)00237-4.
Deaton, L. E. (2001). Hyperosmotic volume regulation in the gills of the ribbed mussel, Geukensia demissa: rapid accumulation of betaine and alanine. Journal of experimental marine biology and ecology, 260(2), 185-197. https://doi.org/10.1016/s0022-0981(01)00237-4
Deaton, L E.. "Hyperosmotic volume regulation in the gills of the ribbed mussel, Geukensia demissa: rapid accumulation of betaine and alanine." Journal of experimental marine biology and ecology vol. 260,2 (2001): 185-197. doi: https://doi.org/10.1016/s0022-0981(01)00237-4
Deaton LE. Hyperosmotic volume regulation in the gills of the ribbed mussel, Geukensia demissa: rapid accumulation of betaine and alanine. J Exp Mar Biol Ecol. 2001 Jun 01;260(2):185-197. doi: 10.1016/s0022-0981(01)00237-4. PMID: 11358578.
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J Exp Mar Biol Ecol. 2001 Jun 01;260(2):185-197. doi: 10.1016/s0022-0981(01)00237-4.

Hyperosmotic volume regulation in the gills of the ribbed mussel, Geukensia demissa: rapid accumulation of betaine and alanine.

Journal of experimental marine biology and ecology

L E. Deaton

Affiliations

  1. Biology Department, University of Louisiana at Lafayette, 70504, Lafayette, LA, USA

PMID: 11358578 DOI: 10.1016/s0022-0981(01)00237-4

Abstract

The content of betaine and alanine in gills of the ribbed mussel Geukensia demissa 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 &mgr;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. The uric acid content of gills is unchanged by exposure to hyperosmotic media, suggesting that uric acid is not a store of nitrogen for alanine synthesis from pyruvate. In other organisms, the accumulation of betaine in response to 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.

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