Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Role of ureogenesis in the mud-dwelled Singhi catfish (Heteropneustes fossilis) under condition of water shortage
Autore:
Saha, N; Das, L; Dutta, S; Goswami, UC;
Indirizzi:
NE Hill Univ, Dept Zool, Biochem Adapt Lab, Shillong 793022, Meghalaya, India NE Hill Univ Shillong Meghalaya India 793022 ong 793022, Meghalaya, India Gauhati Univ, Dept Zool, Guwahati 781014, India Gauhati Univ Guwahati India 781014 iv, Dept Zool, Guwahati 781014, India
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY
fascicolo: 1, volume: 128, anno: 2001,
pagine: 137 - 146
SICI:
1095-6433(200101)128:1<137:ROUITM>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
AIR-BREATHING TELEOST; TOADFISH OPSANUS-BETA; FRESH-WATER; UREA EXCRETION; PERIOPHTHALMUS-CANTONENSIS; GLUTAMINE-SYNTHETASE; TISSUE DISTRIBUTION; AMMONIUM-CHLORIDE; FISH; CYCLE;
Keywords:
ammonia; urea; ureogenesis; urea cycle; mud-dwelled; Singhi catfish; Heteropneustes fossilis; air-breathing; water restriction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Saha, N NE Hill Univ, Dept Zool, Biochem Adapt Lab, Shillong 793022, Meghalaya, India NE Hill Univ Shillong Meghalaya India 793022 22, Meghalaya, India
Citazione:
N. Saha et al., "Role of ureogenesis in the mud-dwelled Singhi catfish (Heteropneustes fossilis) under condition of water shortage", COMP BIOC A, 128(1), 2001, pp. 137-146

Abstract

The air-breathing Singhi catfish Heteropneustes fossilis was kept inside moist peat for 1 month mimicking their normal habitat in summer and the roleof ureogenesis for their survival in a water-restricted condition was studied. The ammonia excretion rate by the mud-dwelled fish increased transiently between 6 and 12 h of re-immersion in water to approximately between eight and 10-fold, followed by a sharp decrease almost to the normal level at the later part of re-immersion. The urea-N excretion by the mud-dwelled fish increased to approximately 11-fold within 0-3 h of re-immersion, followedby a gradual decrease from 9 h onwards. The rate of urea-N excretion by the mud-dwelled fish, however, remained significantly higher (approx. threefold more) than the control fish even after 36-48 h of re-immersion. Althoughthere was a significant increase of both ammonia and urea levels in the plasma and other tissues (except ammonia in the brain), the level of accumulation of urea was higher than ammonia in the mud-dwelled fish as indicated by the decrease in the ratio of ammonia: urea level in different tissues including the plasma. The activities (units/g tissue and /mg protein) of glutamine synthetase and three enzymes of the urea cycle, carbamyl phosphate synthetase, argininosuccinate synthetase and argininosuccinate lyase increasedsignificantly in most of the tissues (except the brain) of the mud-dwelledfish as compared to the control fish. Higher accumulation of ammonia in vivo in the mud-dwelled Singhi catfish is suggested to be one of the major factors contributing to stimulation of ureogenesis. Due to this physiologicaladaptive strategy of ureogenesis, possibly along with other physiological adaptation(s), this air-breathing amphibious Singhi catfish is able to survive inside the moist peat for months in a water-restricted condition. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 02:44:20