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	Provedor de dados ArchiMer (4) Autor Azoulay, E. (1) Chen, Cta (1) Giusti, G. (1) Krishnaswami, S (1) Rengarajan, R (1) Riou, Stéphane Alain (1) Sarin, Mm (1) Stragier, C. (1) Violet, M. (1) Mais... Palavra-chave Dénitrification (4) Denitrification (3) 15N (1) Arabian Sea (1) Associations bactéries phytoplancton (1) Bilan de nutriments (1) Biodégradation (1) Cycle de l'azote dans les sédiments méditerranéens (1) East China Sea (1) Eau intermédiaire du Kuroshio (1) Kuroshio Intermediate Water (1) Lagune (1) MPN (1) Marine laboon (1) Mer d'Arabie (1) Mer de Chine orientale (1) N-serve (1) N6SERVE (1) NPP (1) Nitrate réductase (1) Mais... Tipo do documento Text (4) Ano 2003 (1) 1999 (1) 1998 (1) 1982 (1) País France (4) Idioma Francês (2) Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Cycle de l'azote à l' interface eau-sédiment dans le Bassin d'Arcachon : rôle des bactéries dans les processus de perte en azote (nitrification-dénitrification) ArchiMer Riou, Stéphane Alain. Bacterial nitrification and denitrification were studied in the sediments of the Bassin d'Arcachon, a macrotidallagoon located in the Southwestern Atlantic French coast colonized by extensive Zostera noltii  meadows. Nitrifiers were enumerated by MPN method. Densities were law : from 102 to 104 bacteria per ml of sediment presenting an increase during winter. Nitrifying activities were measured by NH4+  accumulation N-serve block technique. Activities were ranged from 0 to 90 µmol m-2 h-1 and nitrification represented 120-140 mmol m-2 yr-1 for intertidal sediments. The 15N  isotope pairing technique was applied to sediment samples from the whole bay for determining the denitrification rates. Average rates were 10-20 µmol m·2 h-1 with a maximum of 75 µmol... Tipo: Text Palavras-chave: Nitrification; Dénitrification; Sédiment; Zostera noltii; Lagune; NPP; N6SERVE; 15N; Nitrification; Denitrification; Sediment; Zostera noltii; Marine laboon; MPN; N-serve; 15N. Ano: 1999 URL: http://archimer.ifremer.fr/doc/00443/55439/56959.pdf Dégradation des hydrocarbures et dénitrification bacterienne dans les sédiments marins de la cote mediterranéenne ArchiMer Azoulay, E.; Violet, M.; Giusti, G.; Stragier, C.. The bacterial populations located in marine sediments or in the areas of "Etang de Berre" which are regularly polluted by petroleum rejects, are able to degrade hydrocarbons in the presence of ammonium and at a lesser degree in the presence of nitrate as sole nitrogen source. Denitrifying activity was determinated by different methods. The obtained results lead in first approximation to the general following conclusions: - Most of the bacteria which degrade hydrocarbons possess a constitutive nitrate reductase, oxygene and ammonium insensible, which is different from the classical dissimilatory or assimilatory nitrate reductase. - In these bacteria, the lack of nitrite reductase activity allows to explain the nitrite accumulation in the medium where these... Tipo: Text Palavras-chave: Dénitrification; Nitrate réductase; Associations bactéries phytoplancton; Cycle de l'azote dans les sédiments méditerranéens; Biodégradation. Ano: 1982 URL: http://archimer.ifremer.fr/doc/00306/41740/40951.pdf Uranium in the Arabian Sea: role of denitrification in controlling its distribution ArchiMer Rengarajan, R; Sarin, Mm; Krishnaswami, S. A total of 61 samples, from six vertical profiles between surface and 1800 m from the Arabian Sea, have been analysed for uranium concentration to assess its behaviour in oxic and sub-oxic waters. These samples cover a wide range of dissolved oxygen concentration, from 0.14 to 230 muM. Uranium concentration in most of the samples fall in the range of 3.2 +/- 0.2 mug l(-1). In general, uranium exhibits a conservative behaviour in the Arabian Sea water column and denitrification processes do not seem to influence its abundance. The mean uranium/salinity ratio in waters with dissolved oxygen <2 muM is (9.17 +/- 0.15) x 10(-8) g g(-1), nearly identical to the ratio (9.22 +/- 0.27) x 10(-8) g g(-1) in waters with dissolved oxygen >100 muM and in waters... Tipo: Text Palavras-chave: Mer d'Arabie; Uranium; Dénitrification; Niveaux faiblement oxygénés; Arabian Sea; Uranium; Denitrification; Sub-oxic layers. Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43258/42989.pdf Response to Liu's comments on "The Kuroshio Intermediate Water is the major source of nutrients on the East China Sea continental shelf" by Chen (1996) ArchiMer Chen, Cta. Exchanges between the East China Sea (ECS) and the Kuroshio have been recalculated by taking into consideration the intra-annual variation of salinity on the shelf. Flux through the Taiwan Strait, previously unavailable data in the Yellow Sea and in the central and northern ECS, denitrification and ground water fluxes are now also considered. The Kuroshio Intermediate Water remains the major source of nutrients on the East China Sea continental shelf, with slightly more upwelling in the dry season than in the wet season. Tipo: Text Palavras-chave: Mer de Chine orientale; Eau intermédiaire du Kuroshio; Upwelling; Bilan de nutriments; Dénitrification; East China Sea; Kuroshio Intermediate Water; Upwelling; Nutrient budgets; Denitrification. Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43654/43220.pdf Registros recuperados: 4 Primeira ... 1 ... Última

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