{"id":70858,"date":"2025-08-29T12:00:00","date_gmt":"2025-08-29T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/ver-des-abysses-transforme-arsenic-en-orpiment"},"modified":"2025-08-29T23:59:36","modified_gmt":"2025-08-29T23:59:36","slug":"ver-des-abysses-transforme-arsenic-en-orpiment","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/ver-des-abysses-transforme-arsenic-en-orpiment","title":{"rendered":"Ver des Abysses Transforme Arsenic en Orpiment"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Combattre le mal par le mal ou pluto\u0302t, le poison par le poison. C\u2019est la technique choisie par un petit ver jaune d\u2019a\u0300 peine quelques centime\u0300tres pour survivre dans un environnement hautement toxique. En effet, Paralvinella hessleri, un ver des profondeurs marines, colonise les chemine\u0301es des sources hydrothermales, faisant de lui \u00ab le seul animal a\u0300 coloniser la partie la plus chaude des chemine\u0301es hydrothermales profondes dans le Pacifique occidental \u00bb, selon une e\u0301tude chinoise publie\u0301e dans la revue PLOS Biology.<\/p>\n<p>Les chercheurs de l\u2019Institut d\u2019oce\u0301anologie de l\u2019Acade\u0301mie chinoise des sciences ont de\u0301couvert que la substance jaune caracte\u0301ristique de cette espe\u0300ce est en re\u0301alite\u0301 de l\u2019orpiment, un mine\u0301ral sulfure\u0301 autrefois utilise\u0301 comme pigment, que les vers produisent a\u0300 partir des contaminants naturels pre\u0301sents dans leur environnement.<\/p>\n<p><b>Une strate\u0301gie de de\u0301toxification ine\u0301dite<\/b><\/p>\n<p>Les chercheurs apportent un nouvel e\u0301clairage sur la strate\u0301gie de de\u0301toxification innovante utilise\u0301e par P. hessleri pour survivre dans ce milieu extre\u0302me. Ces fluides tre\u0300s chauds qui jaillissent des \u00ab fumeurs noirs \u00bb \u2013 des chemine\u0301es hydrothermales \u2013 dans les fonds marins peuvent contenir des niveaux e\u0301leve\u0301s de sulfure (compose\u0301 de soufre et de fer ou d\u2019hydroge\u0300ne), ainsi que de l\u2019arsenic. Ces e\u0301le\u0301ments s\u2019accumulent dans les tissus de P. hessleri et peuvent repre\u0301senter parfois plus de 1 % de son poids corporel.<\/p>\n<p>Pour survivre, le ver des sources hydrothermales n\u2019e\u0301limine pas ces substances: il les transforme en mine\u0301raux toujours toxiques, mais moins que sous leur forme pure. Sa strate\u0301gie consiste a\u0300 accumuler des particules d\u2019arsenic dans ses cellules cutane\u0301es qui re\u0301agissent ensuite avec le sulfure des fluides hydrothermaux et des toxines de l\u2019animal pour former de petits amas jaunes d\u2019orpiment, un mine\u0301ral toxique autrefois tre\u0300s prise\u0301 des peintres du Moyen A\u0302ge et de la Renaissance.<\/p>\n<p>En utilisant des techniques de microscopie avance\u0301es, les chercheurs ont de\u0301couvert des granules intercellulaires jaunes et parfaitement sphe\u0301riques dans les cellules e\u0301pithe\u0301liales de P. hessleri. Des analyses chimiques et prote\u0301iques ont permis de les identifier: il s\u2019agissait en fait de mine\u0301raux d\u2019orpiment.<\/p>\n<p><b>La vie au sommet des fumeurs noirs<\/b><\/p>\n<p>Les chemine\u0301es hydrothermales se situent sur l\u2019axe des dorsales oce\u0301aniques, des arcs volcaniques et des zones de subduction. Mesurant jusqu\u2019a\u0300 100m de haut, elles laissent e\u0301chapper des fluides a\u0300 tre\u0300s haute tempe\u0301rature, jusqu\u2019a\u0300 350\u00b0C pour les fumeurs dits \u201cnoirs\u201d, qui e\u0301mettent une eau sulfureuse, riche en soufre donc, en mangane\u0300se (un e\u0301le\u0301ment chimique qui donne au fluide sa couleur sombre), mais aussi en fer et en arsenic.<\/p>\n<p>\u00ab Il e\u0301tait difficile de croire qu\u2019un animal puisse survivre, et encore moins prospe\u0301rer, dans un environnement aussi extre\u0302me et toxique \u00bb, raconte le Dr Hao Wang, co-auteur de l\u2019e\u0301tude dans un communique\u0301. Car c\u2019est dans cet environnement hautement toxique que vit le Paralvinella hessleri. Contre toute attente, la vie y est me\u0302me luxuriante.<\/p>\n<p>Aux abords des chemine\u0301es, on trouve surtout des micro-organismes, quelques espe\u0300ces de crabes, de petits poissons et des nue\u0301es d\u2019alevins. Mais sur les points chauds, au plus proche des fluides toxiques, la\u0300 ou\u0300 la temperature est la plus e\u0301leve\u0301e, se trouvent les colonies de vers.<\/p>\n<p>Cette strate\u0301gie nouvellement de\u0301couverte pourrait e\u0302tre utilise\u0301e par des vers apparente\u0301s d\u2019autres re\u0301gions ainsi que par certaines espe\u0300ces d\u2019escargots du Pacifique occidental, qui accumulent e\u0301galement des niveaux e\u0301leve\u0301s d\u2019arsenic.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Combattre le mal par le mal ou pluto\u0302t, le poison par le poison. C\u2019est la technique choisie par un petit ver jaune d\u2019a\u0300 peine quelques centime\u0300tres pour survivre dans un environnement hautement toxique. En effet, Paralvinella hessleri, un ver des profondeurs marines, colonise les chemine\u0301es des sources hydrothermales, faisant de lui \u00ab [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":70857,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-70858","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Ver des Abysses Transforme Arsenic en Orpiment - Senegal<\/title>\n<meta name=\"description\" content=\"Combattre le mal par le mal ou pluto\u0302t, le poison par le poison. 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