{"id":10813,"date":"2017-02-24T17:03:23","date_gmt":"2017-02-24T17:03:23","guid":{"rendered":"https:\/\/www.bioecoactual.com\/2017\/02\/24\/no-nomes-la-dosi-fa-el-veri-el-descobriment-que-podria-canviar-la-legislacio-sobre-pesticides\/"},"modified":"2022-12-28T18:24:21","modified_gmt":"2022-12-28T17:24:21","slug":"no-nomes-la-dosi-fa-el-veri-el-descobriment-que-podria-canviar-la-legislacio-sobre-pesticides","status":"publish","type":"post","link":"https:\/\/www.bioecoactual.com\/ca\/2017\/02\/24\/no-nomes-la-dosi-fa-el-veri-el-descobriment-que-podria-canviar-la-legislacio-sobre-pesticides\/","title":{"rendered":"No nom\u00e9s la dosi fa el ver\u00ed: el descobriment que podria canviar la legislaci\u00f3 sobre pesticides"},"content":{"rendered":"<p><strong><em>Observatorio OMG 24\/02\/2017<br \/><\/em>No nom\u00e9s la dosi fa el ver\u00ed: el descobriment que podria canviar la legislaci\u00f3 sobre pesticides.<\/strong><\/p>\n<p>Tot i que fa temps que es ve parlant del &#8220;efecte c\u00f2ctel&#8221; (exposici\u00f3 a m\u00faltiples subst\u00e0ncies qu\u00edmiques potencialment nocives al mateix temps) aquest <strong>encara no \u00e9s tingut en compte <\/strong>a l&#8217;hora de realitzar les avaluacions de riscos.<\/p>\n<p>  <!--more-->  <\/p>\n<p>No obstant aix\u00f2, experiments com&nbsp;<a href=\"http:\/\/pubs.acs.org\/doi\/abs\/10.1021\/acs.est.6b06163\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\"><strong>aquest<\/strong><\/span>&nbsp;<\/a>de la Universitat de York desvetllen mecanismes mitjan\u00e7ant els quals aquest efecte podria estar funcionant, de formes que ens afecten en el nostre dia a dia: en aquest cas, han comprovat que la seq\u00fc\u00e8ncia en la que s&#8217;administren dues subst\u00e0ncies, quan una provoca efectes dels quals l&#8217;organisme es recupera r\u00e0pid i una altra efectes que triguen m\u00e9s a superar-se, afecta la toxicitat.<\/p>\n<p>Els cient\u00edfics que han dut a terme aquest estudi insten les ag\u00e8ncies encarregades de l&#8217;avaluaci\u00f3 de riscos (com \u00e9s l&#8217;EFSA en el cas de la UE) a tenir en compte aquest efecte a l&#8217;hora de determinar com s&#8217;han d&#8217;avaluar els riscos derivats de la utilitzaci\u00f3 de pesticides, ja que en l&#8217;actualitat nom\u00e9s es consideren aquests com si actuessin per separat.<\/p>\n<blockquote><p><strong>T\u00edtol:&nbsp;<\/strong>Experts insten a la revisi\u00f3 de les directrius sobre pesticides despr\u00e9s d&#8217;un nou estudi de toxicitat<br \/><strong>Origen:&nbsp;<\/strong>Universitat de York<br \/><strong>Enlla\u00e7:<\/strong> <a href=\"https:\/\/www.york.ac.uk\/news-and-events\/news\/2017\/research\/pesticide-toxicity-study\/\" target=\"_blank\" rel=\"noopener\">www.york.ac.uk\/news-and-events\/news\/2017\/research\/pesticide-toxicity-stu..<\/a><a href=\"https:\/\/www.york.ac.uk\/news-and-events\/news\/2017\/research\/pesticide-toxicity-study\/\" target=\"_blank\" rel=\"noopener\"><br \/><\/a><\/p><\/blockquote>\n<p><a href=\"https:\/\/www.york.ac.uk\/news-and-events\/news\/2017\/research\/pesticide-toxicity-study\/\" target=\"_blank\" rel=\"noopener\"><\/a><em>Dimarts, 21 Febrer, 2017 &#8211;&nbsp;<\/em>Cient\u00edfics de la Universitat de York han descobert per primera vegada que la seq\u00fc\u00e8ncia d&#8217;exposici\u00f3 a pesticides i contaminants &#8211; i no nom\u00e9s la dosi &#8211; afecta significativament als nivells de toxicitat per a la fauna silvestre.<\/p>\n<p>Sempre s&#8217;havia donat per fet que &#8220;la dosi fa el ver\u00ed&#8221;, pel que fa als efectes perjudicials que els productes qu\u00edmics poguessin provocar als organismes. No obstant aix\u00f2, s&#8217;ha descobert que quan s&#8217;exposa a un organisme a dues t\u00f2xics seq\u00fcencialment, la toxicitat pot variar si es canvia l&#8217;ordre.<\/p>\n<p>Aix\u00f2 es deu al fet que alguns productes qu\u00edmics produeixen danys prolongats en els sistemes d&#8217;aquests \u00e9ssers vius, que triguen un temps a recuperar-se, el que provoca una &#8220;toxicitat acumulada&#8221; que se suma a l&#8217;efecte del segon contaminant.<\/p>\n<h3>Seq\u00fc\u00e8ncies d&#8217;exposici\u00f3<\/h3>\n<p>En exposar a petits crustacis <em>(Gammarus pulex)<\/em> a diferents t\u00f2xics, es va observar que es provocava m\u00e9s mal a l&#8217;administrar primer contaminants amb un temps de recuperaci\u00f3 curt seguits de subst\u00e0ncies de que els seus danys els organismes poden recuperar-se r\u00e0pidament. Aix\u00f2 canviava si s&#8217;invertia l&#8217;ordre i s&#8217;administrava primer la subst\u00e0ncia amb un temps de recuperaci\u00f3 m\u00e9s curt i despr\u00e9s la de recuperaci\u00f3 m\u00e9s lenta.<\/p>\n<p>Fins i tot si passaven dies entre una exposici\u00f3 i una altra, o si els productes dispensats tenien efectes diferents (\u00e9s a dir, pesticides diferents que utilitzen mecanismes diferents amb llocs diana diferents) els investigadors van observar que la mortalitat excedia les expectatives que podien predir a partir de la seq\u00fc\u00e8ncia pr\u00e8via.<\/p>\n<p>Aix\u00f2 demostra que les directrius actuals d&#8217;avaluaci\u00f3 de riscos dels productes qu\u00edmics podrien estar subestimant greument els riscos associats amb les diferents seq\u00fc\u00e8ncies d&#8217;exposici\u00f3.<\/p>\n<h3>Efectes per a la salut<\/h3>\n<p>El Dr. Roman Ashauer, Professor Titular del Departament de Medi Ambient de York i autor principal de l&#8217;estudi, declara: &#8220;Aquest experiment demostra per primera vegada que els t\u00f2xics interactuen, encara que passin dies entre les exposicions i es tracti de subst\u00e0ncies amb una composici\u00f3 diferent , el que provoca una acumulaci\u00f3 de danys toxicodin\u00e1micos en els organismes.<\/p>\n<p>La seq\u00fc\u00e8ncia d&#8217;exposici\u00f3 i la toxicitat acumulada no es consideren a dia d&#8217;avui en l&#8217;avaluaci\u00f3 de riscos ambientals, aix\u00ed que les implicacions d&#8217;aquest estudi s\u00f3n molt \u00e0mplies. Les directrius per a l&#8217;autoritzaci\u00f3 comercial de productes com els pesticides haurien de revisar per incloure l&#8217;avaluaci\u00f3 de combinacions de subst\u00e0ncies al llarg del temps, per exemple diferents seq\u00fc\u00e8ncies de pesticides.<\/p>\n<p>Hem desenvolupat un model que permet predir l&#8217;efecte de la seq\u00fc\u00e8ncia de t\u00f2xics, i esperem que ag\u00e8ncies com l&#8217;Autoritat Europea de Seguretat Aliment\u00e0ria ho examinin amb atenci\u00f3 i ho tinguin en compte en la seva tasca. L&#8217;exposici\u00f3 a m\u00faltiples t\u00f2xics, en seq\u00fc\u00e8ncies amb alta variabilitat, afecta en el dia a dia als \u00e9ssers humans i als altres organismes, aix\u00ed que \u00e9s vital que parem atenci\u00f3 als possibles efectes nocius per a la salut que es derivin.&#8221;<\/p>\n<blockquote><p><strong>\u201cToxic Mixtures in Time \u2013 the sequence makes the poison\u201d<\/strong> ha estat publicat a la revista Environmental Science and Technology. Es pot accedir a trav\u00e9s d&#8217;aquest vincle: <a href=\"http:\/\/dx.doi.org\/10.1021\/acs.est.6b06163\" target=\"_blank\" rel=\"noopener\">http:\/\/dx.doi.org\/10.1021\/acs.est.6b06163<\/a><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Observatorio OMG 24\/02\/2017No nom&eacute;s la dosi fa el ver&iacute;: el descobriment que podria canviar la legislaci&oacute; sobre pesticides. Tot i que fa temps que es ve parlant del &ldquo;efecte c&ograve;ctel&rdquo; (exposici&oacute; a m&uacute;ltiples subst&agrave;ncies qu&iacute;miques potencialment nocives al mateix temps) aquest encara no &eacute;s tingut en compte a l&rsquo;hora de realitzar les avaluacions de riscos.<\/p>\n","protected":false},"author":419,"featured_media":10811,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7164],"tags":[],"class_list":["post-10813","post","type-post","status-publish","format-standard","has-post-thumbnail","category-actualitat"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>No nom\u00e9s la dosi fa el ver\u00ed: el descobriment que podria canviar la legislaci\u00f3 sobre pesticides - Bio Eco Actual<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bioecoactual.com\/2017\/02\/24\/no-solo-la-dosis-hace-el-veneno-el-descubrimiento-que-podria-cambiar-la-legislacion-sobre-pesticidas\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"No nom\u00e9s la dosi fa el ver\u00ed: el descobriment que podria canviar la legislaci\u00f3 sobre pesticides\" \/>\n<meta property=\"og:description\" content=\"Observatorio OMG 24\/02\/2017No nom&eacute;s la dosi fa el ver&iacute;: el descobriment que podria canviar la legislaci&oacute; sobre pesticides. 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