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Méthodes électrochimiques pour l'analyse in situ de composés bioactifs en milieu océanique ArchiMer
Lacombe, Marielle.
The implementation of in situ autonomous observatories for biogeochemicalstudies in the open ocean water column and in deep-sea chemosynthetic environments is crucial for the understanding of these ecosystems. We focussed this study on silicate and sulphide, two key compounds of the marine food chain. A voltammetric method for sulphide measurements on silver electrode is presented, and a new method for quantitative determination based on the solubility difference between silver chloride and silver sulphide is proposed. A completely reagentless method for silicate measurements is developed using molybdate and protons produced during molybdenum oxidation. These analyticaldevelopments allowed us to validate a submersible potentiostat, first step toward a new...
Tipo: Text Palavras-chave: Water masses; Drake Passage; Sensor; Electrochemistry; Sulphide; Silicate; Deep sea chemosynthetic environments; Open ocean; In situ autonomous observatories; Masses d'eau; Passage de Drake; Capteur; Voltammétrie; Électrochimie; Sulfure; Acide silicique; Écosystèmes profonds; Océan ouvert; Observatoires in situ autonomes.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-3921.pdf
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Pelagic photosymbiosis: rDNA assessment of diversity and evolution of dinoilagellate symbionts and planktonic foraminiferal hosts ArchiMer
Shaked, Yonathan; De Vargas, Colomban.
We present large subunit (LSU) and internal transcribed spacer (ITS) rDNA based phylogenies of symbiotic dinoflagellates retrieved from single-cell planktonic foraminifera collected around the world. All modern foraminiferal species involved in such symbiosis are included in our analyses. The pelagic symbiotic dinoflagellates form a monophyletic group sister to the Symbiodinium species complex found in coastal-benthic environments. The pelagic symbionts are descendants of free-living species and, together with the coastal-benthic Symbiodinium spp., they originated from the early Mesozoic suessiacean family represented by the extant Polarella glacialis. Out of hundreds of single planktonic foraminifera examined, 21 unique pelagic symbiont ribotypes were...
Tipo: Text Palavras-chave: Symbiosis; Planktonic foraminifer; Dinoflagellate; Open ocean; Suessiales.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/00383/49440/49907.pdf
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