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Registros recuperados: 5
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A fractal root model applied for estimating the root biomass and architecture in two tropical legume tree species Inra
Salas, E.; Ozier-Lafontaine, H.; Nygren, P..
Un modèle racinaire fractal dont l'estimation des paramètres repose sur la théorie du « modèle vasculaire » a été appliqué à l'étude de l'architecture de Erythrina lanceolata et Gliricidia sepium cultivés dans des systèmes agroforestiers. Ce modèle a été confronté à un modèle fractal théorique dédié à la simulation du système vasculaire de plantes. La diminution de la section conductrice au niveau de chaque ramification demeure indépendante du diamètre, et peut-être considérée comme étant invariable à l'échelle de l'ensemble du système racinaire. Les valeurs des paramètres d'échelle sont approximativement équivalentes pour les deux espèces. La distance entre deux ramifications n'a pas pu être estimée à partir du deuxième modèle, aussi a-t-elle été estimée...
Tipo: Journal Article Palavras-chave: MODELE VASCULAIRE; AUTOSIMILARITE ERYTHRINA LANCEOLATA; GLIRICIDIA SEPIUM.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007ba5dd255&uri=/notices/prodinra1/2009/12/
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Characterization of pigments from different high speed countercurrent chromatography wine fractions Inra
Salas, E.; Duenas, M.; Schwarz, M.; Winterhalter, P.; Cheynier, V.; Fulcrand, H..
A red wine, made from Cabernet Sauvignon (60%) and Tannat (40%) cultivars, was fractionated by high speed countercurrent chromatography (HSCCC). The biphasic solvent system consisting of tertbutyl methyl ether/n-butanol/acetonitrile/water (2/2/1/5, acidified with 0.1% trifluoroacetic acid) was chosen for its demonstrated efficiency in separating anthocyanins. The different native and derived anthocyanins were identified on the basis of their UV-visible spectra, their elution time on reversed-phase high-performance liquid chromatography (HPLC), and their mass spectra, before and after thiolysis. The HSCCC method allowed the separation of different families of anthocyanin-derived pigments that were eluted in different fractions according to their structures....
Tipo: Journal Article Palavras-chave: WINE; HSCCC; HIGH SPEED COUNTERCURRENT CHROMATOGRAPHY; ANTHOCYANINS; FLAVANOLS; ADDUCTS; LC/DAD/ESI-MS; DERIVED PIGMENTS.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007430c83fa&uri=/notices/prodinra1/2007/02/
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Demonstration of the occurrence of flavanol–anthocyanin adducts in wine and in model solutions Inra
Salas, E.; Atanasova, V.; Poncet-Legrand, C.; Meudec, E.; Mazauric, J.P.; Cheynier, V..
Flavanol-anthocyanin (F-A(+)) adducts were detected in red wine. A mechanism involving acid-catalysed cleavage of flavanol oligomers followed by nucleophilic addition of the anthocyanin moiety (in its hemiketal form) to the resulting carbocation (F+) was postulated. To confirm this mechanism, reactions between malvidin3-O-glucoside (Mv3glc) and procyanidin dimerepicatechin-(4-8)-epicatechin 3-O-gallate (B2-3'OG) were studied in a model solution system at pH 2. A new pigment with a UV-Vis spectrum similar to that of Mv3glc and a signal at m/z = 781 in the positive ion mode was detected and was attributed to Ec-Mv3glc, in agreement with the proposed reaction pathway
Tipo: Journal Article Palavras-chave: ANTHOCYANIN; FLAVANOL; PROCYANIDIN; ADDUCT; PIGMENT; THIOLYSIS; MODEL SOLUTION; WINE; HPLC/MS.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20086878f1cf&uri=/notices/prodinra1/2009/02/
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El potencial hidrico del lago IRD
Bourges, Jacques; Cortes, J.; Salas, E..
Tipo: Text Palavras-chave: LAC; HYDROGRAPHIE; RESSOURCES EN EAU; EXPLOITATION DES RESSOURCES NATURELLES; ENERGIE; IRRIGATION; HAUT PLATEAU.
Ano: 1991 URL: http://www.documentation.ird.fr/hor/fdi:36649
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Phenolic reactions during winemaking and aging Inra
Fulcrand, H.; Duenas, M.; Salas, E.; Cheynier, V..
The reactivity of polyphenols is due to the position of the hydroxyl groups on their aromatic nuclei. Ortho-hydroxyl groups promote oxidation while meta-hydroxyl groups induce electrophilic aromatic substitution. Both hydroxylation patterns are encountered in flavonoid structures, on the B and A rings, respectively. In addition to oxidation and electrophilic aromatic substitution, flavonoids undergo nucleophilic addition on the central C ring when it is positively charged. Reactions of the A and C rings are pH-dependent. The A ring of flavonoids undergoes a polycondensation reaction mediated by an aldehyde. The products are anthocyanin and flavanol polymers and copolymers constituted of both. Flavanol polymers are not stable and rearrange into vinyl...
Tipo: Journal Article Palavras-chave: TANNIN; ANTHOCYANIN; POLYPHENOL; WINE; REACTION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20102637f155&uri=/notices/prodinra1/2010/09/
Registros recuperados: 5
Primeira ... 1 ... Última
 

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