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Titolo:
EFFECT OF NICKEL ON CERTAIN PHYSIOLOGICAL AND BIOCHEMICAL BEHAVIORS OF AN ACID-TOLERANT CHLORELLA-VULGARIS
Autore:
RAI PK; MALLICK N; RAI LC;
Indirizzi:
BANARAS HINDU UNIV,CTR ADV STUDY BOT,ALGAL BIOL LAB VARANASI 221005 UTTAR PRADESH INDIA
Titolo Testata:
BioMetals
fascicolo: 2, volume: 7, anno: 1994,
pagine: 193 - 200
SICI:
0966-0844(1994)7:2<193:EONOCP>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEMBRANE H+-ATPASE; DUNALIELLA-ACIDOPHILA; NOSTOC-MUSCORUM; ALGA; PH; TOXICITY; POTENTIALS; FLUXES; GROWTH; ASSAY;
Keywords:
CHLORELLA VULGARIS; ACID TOLERANCE; ATPASE; NICKEL TOXICITY; NUTRIENT UPTAKE; PHOTOSYNTHESIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
P.K. Rai et al., "EFFECT OF NICKEL ON CERTAIN PHYSIOLOGICAL AND BIOCHEMICAL BEHAVIORS OF AN ACID-TOLERANT CHLORELLA-VULGARIS", BioMetals, 7(2), 1994, pp. 193-200

Abstract

This study concerns the inhibitory effects of acid pH and nickel on growth, nutrient (NO3- and NH4+) uptake, carbon fixation, O-2 evolution, electron transport chain and enzyme (nitrate reductase and ATPase) activities of acid tolerant and wild-type strains of Chlorella vulgaris. Though a general reduction in all these variables was noticed with decreasing pH, the tolerant strain was found to be metabolically more active than the wild-type. A reduced cation (NH4+, Na+, K+ and Ca2+) uptake, coupled with a facilitated influx of anions (NH4+, PO43- and HCO3-), suggested the development of a positive membrane potential in acid tolerant Chlorella. Nevertheless, a tremendous increase in ATPase activity at decreasing pH revealed the involvement of superactive ATPasein exporting H+ ions and keeping the internal pH neutral. A difference in Na+ and K+ efflux of the two strains at decreasing pH suggests there is a difference in membrane permeability. The low toxicity of Ni in the acid tolerant strain may be due to the low Ni uptake brought about by a change in membrane potential as well as in permeability. Hence, the development of superactive ATPase and a change in both membrane potential and permeability not only offers protection against acidity,but also co-tolerance to metals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 10:47:20