{"id":82753,"date":"2019-01-29T12:35:52","date_gmt":"2019-01-29T12:35:52","guid":{"rendered":"http:\/\/humanitasnet-new.local\/enciclopedia\/molybdene\/"},"modified":"2019-01-29T12:35:52","modified_gmt":"2019-01-29T12:35:52","slug":"molybdene","status":"publish","type":"enciclopedia","link":"https:\/\/humanitas-net.humweb.webiz.team\/fr\/wiki\/molybdene\/","title":{"rendered":"Molybd\u00e8ne"},"content":{"rendered":"<h2 id=\"quest-ce-que-le-molybdene\">Qu&#8217;est-ce que le molybd\u00e8ne ?<\/h2>\n<p>Le molybd\u00e8ne est un oligo-\u00e9l\u00e9ment essentiel pour pratiquement toutes les formes de vie. Il est pr\u00e9sent et principalement stock\u00e9 dans le foie, les reins, les glandes et les os. Il est \u00e9galement pr\u00e9sent dans les poumons, la rate, la peau et les muscles. Le molybd\u00e8ne joue un r\u00f4le de cofacteur dans diverses fonctions enzymatiques de l&#8217;organisme qui sont essentielles aux transformations chimiques du carbone, de l&#8217;azote et du soufre. Ainsi, les enzymes d\u00e9pendantes du molybd\u00e8ne sont non seulement n\u00e9cessaires \u00e0 la sant\u00e9 humaine, mais aussi \u00e0 la sant\u00e9 de l&#8217;\u00e9cosyst\u00e8me.<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"quelle-est-la-fonction-du-molybdene\">Quelle est la fonction du molybd\u00e8ne ?<\/h2>\n<p>90 % du molybd\u00e8ne introduit dans l&#8217;organisme par les aliments est \u00e9limin\u00e9 par la miction. La partie retenue participe \u00e0 la d\u00e9gradation des prot\u00e9ines et autres substances. De plus, le molybd\u00e8ne est un composant des coenzymes n\u00e9cessaires \u00e0 l&#8217;activit\u00e9 de quatre enzymes : sulfite oxydase, xanthine oxydase, ald\u00e9hyde oxydase et amidoxime mitochondrial.<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"quels-sont-les-aliments-riches-en-molybdene\">Quels sont les aliments riches en molybd\u00e8ne ?<\/h2>\n<p>Le molybd\u00e8ne est pr\u00e9sent dans le lait, le fromage, les c\u00e9r\u00e9ales, les l\u00e9gumineuses, les noix, diverses viandes et les l\u00e9gumes verts \u00e0 feuilles. La teneur en molybd\u00e8ne des aliments d\u00e9pend grandement de la teneur en molybd\u00e8ne des sols sur lesquels les aliments ont \u00e9t\u00e9 cultiv\u00e9s. De plus, le molybd\u00e8ne est pr\u00e9sent en quantit\u00e9s variables dans certains aliments ainsi que dans l&#8217;eau.<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"quels-sont-les-besoins-quotidiens-recommandes-en-molybdene\">Quels sont les besoins quotidiens recommand\u00e9s en molybd\u00e8ne ?<\/h2>\n<p>Il n&#8217;y a pas d&#8217;apport quotidien recommand\u00e9 de molybd\u00e8ne. Toutefois, les niveaux ont tendance \u00e0 varier selon l&#8217;\u00e2ge de l&#8217;individu.<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>Pour les nourrissons de 0 \u00e0 6 mois on recommande un apport quotidien de 0,003 \u00e0 0,06 mg<\/li>\n<li>Pour les nourrissons de 6 \u00e0 12 mois, on recommande un apport quotidien de 0,04 \u00e0 0,08 mg<\/li>\n<li>Pour les nourrissons de 1 \u00e0 3 ans, on recommande un apport quotidien 0,05 \u00e0 0,10 mg<\/li>\n<li>Pour les enfants de 4 \u00e0 6 ans, on recommande un apport quotidien de 0,06 \u00e0 0,15 mg<\/li>\n<li>Pour les enfants de 7 \u00e0 10 ans, on recommande un apport quotidien 0,10-0,30 m<\/li>\n<li>Pour les enfants de 11 ans et plus, on recommande un apport quotidien 0,15 \u00e0 0,50 mg.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2 id=\"quelles-sont-les-consequences-dune-carence-en-molybdene\">Quelles sont les cons\u00e9quences d&#8217;une carence en molybd\u00e8ne ?<\/h2>\n<p>La carence en molybd\u00e8ne est un ph\u00e9nom\u00e8ne rare, mais lorsqu&#8217;elle se produit, c&#8217;est g\u00e9n\u00e9ralement de causes g\u00e9n\u00e9tiques ou nutritionnelles. Dans les cas g\u00e9n\u00e9tiques, les cons\u00e9quences peuvent inclure une d\u00e9ficience intellectuelle, des convulsions, une hypertension grave, la spasticit\u00e9 et le d\u00e9placement du cristallin de l&#8217;\u0153il de sa position normale (<em>ectopia lentis<\/em>). D&#8217;autres probl\u00e8mes caus\u00e9s par une p\u00e9nurie de molybd\u00e8ne comprennent la tachycardie, la tachypn\u00e9e, les maux de t\u00eate, les naus\u00e9es, les vomissements et le coma. La privation continue de molybd\u00e8ne entra\u00eene l&#8217;accumulation d&#8217;acide urique dans le sang, ce qui provoque des articulations horriblement inflammatoires et douloureuses. Dans le pire des cas, une carence en molybd\u00e8ne peut d\u00e9truire le syst\u00e8me nerveux.<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"quelles-sont-les-consequences-dun-apport-excessif-en-molybdene\">Quelles sont les cons\u00e9quences d&#8217;un apport excessif en molybd\u00e8ne ?<\/h2>\n<p>Trop de molybd\u00e8ne peut causer des sympt\u00f4mes semblables \u00e0 ceux de la goutte et d&#8217;autres probl\u00e8mes touchant le tractus gastro-intestinal, le foie et les reins. Un apport excessif en molybd\u00e8ne peut \u00e9galement causer une carence mortelle en cuivre. L&#8217;exc\u00e8s de molybd\u00e8ne se combine aux quatre atomes de soufre pour former le t\u00e9trathiomolybdate, qui s&#8217;empare \u00e0 son tour du cuivre voisin, bloquant ainsi l&#8217;absorption et l&#8217;activit\u00e9 des enzymes d\u00e9pendant du cuivre.<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","Example":[1803],"class_list":["post-82753","enciclopedia","type-enciclopedia","status-publish","hentry","enciclopedia_category-mineraux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Molybd\u00e8ne - Humanitas.net<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molybd\u00e8ne - Humanitas.net\" \/>\n<meta property=\"og:description\" content=\"Qu&#8217;est-ce que le molybd\u00e8ne ? 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