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Titolo:
MODELING THE INTERACTIONS BETWEEN AMMONIUM AND NITRATE UPTAKE IN MARINE-PHYTOPLANKTON
Autore:
FLYNN KJ; FASHAM MJR; HIPKIN CR;
Indirizzi:
UNIV COLL SWANSEA,SCH BIOL SCI,SWANSEA ALGAL RES UNIT,SINGLETON PK SWANSEA SA2 8PP W GLAM WALES SOUTHAMPTON OCEANOG CTR SOUTHAMPTON SO14 3ZH HANTS ENGLAND
Titolo Testata:
Philosophical transactions-Royal Society of London. Biological sciences
fascicolo: 1361, volume: 352, anno: 1997,
pagine: 1625 - 1645
SICI:
0962-8436(1997)352:1361<1625:MTIBAA>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIATOM SKELETONEMA-COSTATUM; PHAEODACTYLUM-TRICORNUTUM BOHLIN; AMINO-ACIDS; GLUTAMINE-SYNTHETASE; NITROGEN LIMITATION; INORGANIC NITROGEN; REDUCTASE-ACTIVITY; ANKISTRODESMUS-BRAUNII; TRANSIENT SITUATIONS; MONOCHRYSIS-LUTHERI;
Tipo documento:
Review
Natura:
Periodico
Citazioni:
102
Recensione:
Indirizzi per estratti:
Citazione:
K.J. Flynn et al., "MODELING THE INTERACTIONS BETWEEN AMMONIUM AND NITRATE UPTAKE IN MARINE-PHYTOPLANKTON", Philosophical transactions-Royal Society of London. Biological sciences, 352(1361), 1997, pp. 1625-1645

Abstract

An empirically based mathematical model is presented which can simulate the major features of the interactions between ammonium and nitratetransport and assimilation in phytoplankton. The model (ammonium-nitrate interaction model), which is configured to simulate a generic microalga rather than a specified species, is constructed on simplified biochemical bases. A major requirement for parametrization is that the N:C ratio of the algae must be known and that transport and internal pool sizes need to be expressed per unit of cell C. The model uses the size of an internal pool of an early organic product of N assimilation (glutamine) to regulate rapid responses in ammonium-nitrate interactions. The synthesis of enzymes for the reduction of nitrate through to ammonium is induced by the size of the internal nitrate pool and repressed by the size of the glutamine pool. The assimilation of intracellular ammonium (into glutamine) is considered to be a constitutive process subjected to regulation by the size of the glutamine pool. Longer term responses have been linked to the nutrient history of the cell using the N:C cell quota. N assimilation in darkness is made a function ofthe amount of surplus C present and thus only occurs at low values ofN:C. The model can simulate both qualitative and quantitative temporal shifts in the ammonium-nitrate interaction, while inclusion of a derivation of the standard quota model enables a concurrent simulation ofcell growth and changes in nutrient status.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 20:32:51