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Home > Art, Film & Photography > Compose Phytochimique: Glucosinolate, Acide Tannique, Arbutine, Phytoncide
Compose Phytochimique: Glucosinolate, Acide Tannique, Arbutine, Phytoncide

Compose Phytochimique: Glucosinolate, Acide Tannique, Arbutine, Phytoncide


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About the Book

Les achats comprennent une adhesion a l'essai gratuite au club de livres de l'editeur, dans lequel vous pouvez choisir parmi plus d'un million d'ouvrages, sans frais. Le livre consiste d'articles Wikipedia sur: Glucosinolate, Acide Tannique, Arbutine, Phytoncide. Non illustre. Mises a jour gratuites en ligne. Extrait: Les glucosinolates, autrefois appeles heterosides soufres, ou "thioglucosides," sont des composes organiques rassemblant autour d'un atome de carbone: Ce sont des metabolites secondaires des plantes de l'ordre des Brassicales, et en particulier de la famille des Brassicaceae (les cruciferes comme le choux ou le radis), qui agissent en tant que moyen de defense contre les ravageurs. Ils sont responsables de la saveur amere ou piquante de nombreux aliments communs comme la moutarde, les radis, le cresson, le chou-fleur etc. Structure de la molecule. Le groupe R est variable. Le squelette d'un glucosinolate comporte un glucose, un groupe sulfate et une genine variable. Actuellement, environ 120 glucosinolates ont ete identifies dans les plantes. Dans le colza (Brassica napus), on en a trouve pas moins d'une trentaine. Cette grande diversite est liee a celle des acides amines precurseurs de ces composes. Sept acides amines sont concernes (alanine, leucine, isoleucine, valine, phenylalanine, tyrosine et tryptophane) et divers homologues. On observe par exemple les derivations: Fahey et collaborateurs proposent une classification des glucosinolates en fonction de la structure chimique du groupe R: Degradation des glucosinolatesLes glucosinolates sont stockes dans les vacuoles avec de l'acide ascorbique o ils restent non actifs tant qu'ils ne rencontrent pas une enzyme, la myrosinase. Celle-ci est localisee dans certaines cellules du phloeme ou du mesophylle, isolee des glucosinolates. Lorsque le tissu de la plante est lese, la compartimentation est detruite et l'enzyme entre alors en contact avec le glucosinolat...http: //booksllc.net/?l=fr


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Product Details
  • ISBN-13: 9781159587246
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Weight: 54 gr
  • ISBN-10: 1159587248
  • Publisher Date: 30 Jul 2010
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Sub Title: Glucosinolate, Acide Tannique, Arbutine, Phytoncide
  • Width: 229 mm


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