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Titolo:
RELEASE OF NITRITE BY MARINE DINOFLAGELLATES - DEVELOPMENT OF A MATHEMATICAL SIMULATION
Autore:
FLYNN KJ; FLYNN K;
Indirizzi:
UNIV COLL SWANSEA,SCH BIOL SCI,SWANSEA ALGAL RES UNIT,SINGLETON PK SWANSEA SA2 8PP W GLAM WALES
Titolo Testata:
Marine Biology
fascicolo: 3, volume: 130, anno: 1998,
pagine: 455 - 470
SICI:
0025-3162(1998)130:3<455:RONBMD>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIATOM SKELETONEMA-COSTATUM; INTRACELLULAR AMINO-ACIDS; CENTRAL NORTH PACIFIC; NITRATE UPTAKE; PROROCENTRUM-MINIMUM; INORGANIC NITROGEN; GONYAULAX-POLYEDRA; TRANSIENT-RESPONSE; RED TIDE; PHYTOPLANKTON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
K.J. Flynn e K. Flynn, "RELEASE OF NITRITE BY MARINE DINOFLAGELLATES - DEVELOPMENT OF A MATHEMATICAL SIMULATION", Marine Biology, 130(3), 1998, pp. 455-470

Abstract

The dinoflagellates Scrippsiella trochoidea (Stein) and Alexandrium minutum (Halim) were grown in a light-dark cycle with nitrate or nitrate plus ammonium under three different nutrient-supply regimes (dilution with fresh media in dark phase only or during the entire light-dark cycle at the same daily dilution rate, or with a faster continuous dilution). When supplied with nitrate + ammonium, A. minutum released a proportion (as much as 100% from dark-fed cells) of the nitrate taken up during the dark phase as nitrite, reflecting a rate-limiting step atnitrite reduction and poor regulation of inorganic-N uptake and assimilation. S. trochoidea released much smaller amounts of nitrite, if any. Nitrate and ammonium were not accumulated to any extent by either species in darkness, and the transient increases in the size of the free amino acid pool were too small to explain the fate of the newly assimilated N. Thus uptake through to incorporation of N into macromolecules appeared to be coupled in these species, even in darkness when increasing glutamine:glutamate (Gln:Glu) ratios suggested rising C-stress. A mechanistic model was developed from an earlier ammonium-nitrate interaction model (ANIM) by the inclusion of an internal nitrite pool, with control over the supply of reductant for nitrite reduction linked to photosynthetic and respiratory components. The model can reproduce the release of nitrite seen in the experiments, and also the release of nitrite in response to nitrate-feeding of N-stressed cells reported elsewhere.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 10:38:50