{"id":17,"date":"2017-02-01T15:28:57","date_gmt":"2017-02-01T15:28:57","guid":{"rendered":"http:\/\/abspace.yves-rocher.com\/fi\/?p=17"},"modified":"2017-03-24T11:56:26","modified_gmt":"2017-03-24T11:56:26","slug":"les-cheveux-et-les-fleurs","status":"publish","type":"post","link":"https:\/\/abspace.yves-rocher.com\/fi\/fi\/les-cheveux-et-les-fleurs\/","title":{"rendered":"Les cheveux et les fleurs"},"content":{"rendered":"
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Les cheveux de sept personnalit\u00e9s \u00e9cologistes contiennent des perturbateurs endocriniens. Tel est le r\u00e9sultat d'une \u00e9tude men\u00e9e par l'ONG (organisation non gouvernementale)\u00a0G\u00e9n\u00e9rations futures<\/a>. Celle-\u00e7i \u00e9voque un \u00abcocktail important de nombreux perturbateurs endocriniens (de 36 \u00e0 68 par personne), bien que quatre familles de substances chimiques seulement aient \u00e9t\u00e9 recherch\u00e9es\u00bb.<\/p>\n

Les perturbateurs endocriniens (PE) sont des substances pr\u00e9sentes dans de nombreux produits<\/a> du quotidien (cosm\u00e9tiques, jouets, peintures, contenants alimentaires...), qui perturbent le syst\u00e8me hormonal et peuvent g\u00e9n\u00e9rer maladies et anomalies. L'analyse r\u00e9alis\u00e9e pour G\u00e9n\u00e9rations Futures a port\u00e9 sur quatre familles de PE : bisph\u00e9nols, phtalates, PCB (polychlorobiph\u00e9nyles) et pesticides. Deux cents mol\u00e9cules ont \u00e9t\u00e9 recherch\u00e9es.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div>

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La plupart des fleurs sont hermaphrodites<\/a>1<\/a><\/sup>, c'est-\u00e0-dire qu'elles ont \u00e0 la fois des organes reproducteurs m\u00e2les et femelles\u00a0: elles ont un pistil<\/a> et des \u00e9tamines<\/a>. Les \u00e9tamines sont la partie m\u00e2le (qui lib\u00e8re du pollen<\/a>), et le pistil la partie femelle (qui re\u00e7oit le pollen). Certaines plantes comme le pistachier<\/a> ou le kiwi<\/a> ont des fleurs qui ne sont pas hermaphrodites\u00a0: elles sont soit m\u00e2les, soit femelles, les scientifiques parlent de fleurs gonochoriques<\/a>. D'autres plantes comme l'avocatier<\/a> ont des fleurs qui sont successivement m\u00e2les et femelles, on parle alors d'hermaphrodisme successif<\/a>.<\/p>\n

La fleur hermaphrodite est constitu\u00e9e de pi\u00e8ces florales ins\u00e9r\u00e9es sur un r\u00e9ceptacle floral<\/a>. Lorsque la fleur est compl\u00e8te, elle comprend quatre verticilles<\/a> de pi\u00e8ces florales<\/a>. De l'ext\u00e9rieur vers l'int\u00e9rieur, on rencontre\u00a0:<\/p>\n

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  1. le calice<\/a>, form\u00e9 par l'ensemble des s\u00e9pales<\/a>\u00a0;<\/li>\n
  2. la corolle<\/a>, form\u00e9e par l'ensemble des p\u00e9tales<\/a>\u00a0;<\/li>\n
  3. l'androc\u00e9e<\/a>, c'est-\u00e0-dire l'ensemble des \u00e9tamines<\/a> (partie m\u00e2le), qui produit le pollen<\/a>\u00a0;<\/li>\n
  4. le gyn\u00e9c\u00e9e<\/a> ou pistil<\/a>, form\u00e9 par l'ensemble des carpelles<\/a> (partie femelle).<\/li>\n<\/ol>\n

    Calice et corolle forment le p\u00e9rianthe<\/a>, enveloppe st\u00e9rile, qui joue un r\u00f4le protecteur pour les pi\u00e8ces fertiles, et attractif pour les animaux pollinisateurs.<\/p>\n

    Ce plan th\u00e9orique de la fleur, que l'on trouve typiquement chez le bouton d'or<\/a> (Renonculac\u00e9es<\/a>), est sujet \u00e0 de nombreuses variations. On rencontre par exemple des fleurs sans p\u00e9tales, dites \u00ab\u00a0ap\u00e9tales\u00a0\u00bb. Une fleur mixte est une fleur qui poss\u00e8de \u00e0 la fois \u00e9tamines et pistil.<\/p>\n

    \u00ab\u00a0La fleur double<\/a> est celle dont quelqu'une des parties est multipli\u00e9e au-del\u00e0 de son nombre naturel, mais sans que cette multiplication nuise \u00e0 la f\u00e9condation<\/a>. Les fleurs se doublent rarement par le calice, presque jamais par les \u00e9tamines. Leur multiplication la plus commune se fait par la corolle. Les exemples les plus fr\u00e9quents sont dans les fleurs polyp\u00e9tales, comme \u0153illets<\/a>, an\u00e9mones<\/a>, renoncules<\/a>\u00a0; les fleurs monop\u00e9tales doublent moins commun\u00e9ment. Cependant on voit assez souvent des campanules<\/a>, des primev\u00e8res<\/a> auricules, et surtout des jacinthes<\/a> \u00e0 fleur double. Ce mot de fleur double ne marque pas dans le nombre des p\u00e9tales une simple duplication, mais une multiplication quelconque. Soit que le nombre des p\u00e9tales devienne double, triple, quadruple, etc., tant qu'ils ne multiplient pas au point d'\u00e9touffer la fructification, la fleur garde toujours le nom de fleur double\u00a0; mais, lorsque les p\u00e9tales trop multipli\u00e9s font dispara\u00eetre les \u00e9tamines et avorter le germe, alors la fleur perd le nom de fleur double et prend celui de fleur pleine.\u00a0\u00bb<\/span>2<\/a><\/sup><\/p>\n<\/div>\n<\/div><\/div><\/div>

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    Les cheveux de sept personnalit\u00e9s \u00e9cologistes contiennent des perturbateurs endocriniens.<\/p>\n","protected":false},"author":1,"featured_media":18,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-17","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nAct Beautiful - Les cheveux et les fleurs - Yves Rocher<\/title>\n<meta name=\"description\" content=\"Les cheveux de sept personnalit\u00e9s \u00e9cologistes contiennent des perturbateurs endocriniens.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/abspace.yves-rocher.com\/fi\/fi\/les-cheveux-et-les-fleurs\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Act Beautiful - 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