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Titolo:
TRANSEPITHELIAL POTENTIAL DIFFERENCES AND SODIUM FLUXES IN ISOLATED-PERFUSED GILLS OF THE MANGROVE CRAB UCIDES CORDATUS
Autore:
MARTINEZ CBR; HARRIS RR; SANTOS MCF;
Indirizzi:
UNIV ESTADUAL LONDRINA,CCB,DEPT CIENCIAS FISIOL,CP 6001 BR-86051970 LONDRINA PARANA BRAZIL UNIV LEICESTER,DEPT ZOOL LEICESTER LE1 7RH LEICS ENGLAND UNIV SAO PAULO,INST BIOCIENCIAS,DEPT FISIOL,CEBIMAR SAO PAULO BRAZIL
Titolo Testata:
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
fascicolo: 2, volume: 120, anno: 1998,
pagine: 227 - 236
SICI:
1095-6433(1998)120:2<227:TPDASF>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARCINUS-MAENAS; SHORE CRAB; ERIOCHEIR-SINENSIS; ION-TRANSPORT; CHLORIDE TRANSPORT; MEMBRANE-VESICLES; FRESH-WATER; SEA-WATER; AMILORIDE; EPITHELIUM;
Keywords:
HYPER-HYPOREGULATION; ISOLATED GILL; MANGROVE CRAB; SEMITERRESTRIAL CRAB; SODIUM FLUXES; TRANSEPITHELIAL POTENTIAL DIFFERENCE; UCIDES CORDATUS; OSMOREGULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
C.B.R. Martinez et al., "TRANSEPITHELIAL POTENTIAL DIFFERENCES AND SODIUM FLUXES IN ISOLATED-PERFUSED GILLS OF THE MANGROVE CRAB UCIDES CORDATUS", Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, 120(2), 1998, pp. 227-236

Abstract

Marked differences in transepithelial potential difference (TEP) and unidirectional sodium fluxes were observed in isolated, perfused posterior gills 5 and 6 of the hyper-hyporegulating crab Ucides cordatus. Gills were perfused with a saline which closely matched the compositionof the crab's haemolymph, and bathed with 9, 17, 26 and 34 parts per thousand seawater (SW). In 26 parts per thousand SW, TEPs were small and similar in magnitude and sign for both gills, but in all other salinities TEPs were very different, exhibiting opposite polarities and different responses to the changes in external salinity. Calculated relative ionic permeabilities, P-Na:P-Cl, showed that gills 5 were more permeable to sodium than gills 6, while the latter were chloride permeable. In gills 5 the TEP can be regarded as a diffusion potential. This is not the case in gill 6 where ion extrusion probably takes place. Influx rates in gill 5 were larger than efflux rates in all salinities and ranged from 726.93 +/- 103.52 to 1111.47 +/- 135.55 mu M Na+ g(-1) h(-1). Sodium efflux varied from 337.49 +/- 56.42 to 689.03 +/- 108.87mu M Na+ g(-1) h(-1). In gill 6 influx rates were orders of magnitudesmaller (3.67 +/- 0.25 to 8.45 +/- 0.79 mu M Na+ g(-1) h(-1)), while efflux rates varied from 87.24 +/- 20.25 to 223.27 +/- 19.38 mu M Na+ g(-1) h(-1). Flux-ratio analysis showed active uptake of Na+ in gill 5and active extrusion in gills 6, suggesting functional differences inadjacent gills of this hyper-hyporegulating crab. (C) 1998 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/08/20 alle ore 08:22:58