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pubmed-article:16664721pubmed:dateCreated2010-6-29lld:pubmed
pubmed-article:16664721pubmed:abstractTextThe rate of HCO(3) (-) uptake by the red macroalga Chondrus crispus has been investigated. Unbalanced concentrations of free CO(2) and HCO(3) (-), generated by the photosynthetic activity, were detected in steady state conditions by using an exchange column apparatus linked to an assimilation chamber. Observing the variations of this gradient as influenced by the time of seawater transit from the assimilation chamber towards the column allowed an experimental determination of: (a) the actual gradient created by the photosynthetic activity, (b) the rate constant of the chemical conversion of free CO(2) to HCO(3) (-). With a value of 0.115 per second at pH 8.92, this rate constant was in good agreement with a previous estimation. By using a simple model, we show that the photosynthetic rate of HCO(3) (-) consumption can be estimated by the product of the actual gradient and the rate constant. In the conditions of the experiments reported here, this rate represented more than 90% of the whole photosynthetic flux.lld:pubmed
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pubmed-article:16664721pubmed:authorpubmed-author:AndreMMlld:pubmed
pubmed-article:16664721pubmed:authorpubmed-author:GerbaudAAlld:pubmed
pubmed-article:16664721pubmed:authorpubmed-author:BrechignacFFlld:pubmed
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pubmed-article:16664721pubmed:volume80lld:pubmed
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pubmed-article:16664721pubmed:pagination1059-62lld:pubmed
pubmed-article:16664721pubmed:dateRevised2010-9-14lld:pubmed
pubmed-article:16664721pubmed:year1986lld:pubmed
pubmed-article:16664721pubmed:articleTitlePreferential Photosynthetic Uptake of Exogenous HCO(3) in the Marine Macroalga Chondrus crispus.lld:pubmed
pubmed-article:16664721pubmed:affiliationInstitut de Recherche Fondamentale, C.E.N. Cadarache-13108 St Paul lez Durance Cedex, France.lld:pubmed
pubmed-article:16664721pubmed:publicationTypeJournal Articlelld:pubmed
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