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{"id":91,"date":"2025-07-02T14:03:58","date_gmt":"2025-07-02T14:03:58","guid":{"rendered":"https:\/\/commidisac.com\/?p=91"},"modified":"2025-07-02T14:03:58","modified_gmt":"2025-07-02T14:03:58","slug":"les-bacteries-qui-vivent-sur-notre-peau-agissent-comme-un-ecran-solaire","status":"publish","type":"post","link":"https:\/\/commidisac.com\/?p=91","title":{"rendered":"Les bact\u00e9ries qui vivent sur notre peau agissent comme un \u00e9cran solaire"},"content":{"rendered":"<p>Il est erron\u00e9 de consid\u00e9rer le rayonnement ultraviolet comme quelque chose de n\u00e9gatif\u00a0: il s&rsquo;agit simplement d&rsquo;une puissante source d&rsquo;influence externe sur tout ce qu&rsquo;il touche. Tout d\u00e9pend alors de la r\u00e9action de la mati\u00e8re vivante. En particulier, l&rsquo;irradiation intensive des cellules de la couche sup\u00e9rieure de la peau produit de l&rsquo;acide cis-urocanique. Cet acide poss\u00e8de un puissant effet oxydant, ce qui lui permet de d\u00e9truire les cellules canc\u00e9reuses, mais il nuit \u00e9galement aux cellules saines, agissant comme un d\u00e9presseur pour elles.<\/p>\n<p>La bact\u00e9rie Staphylococcus epidermidis a appris \u00e0 produire l&rsquo;enzyme urokinase, qui d\u00e9compose les mol\u00e9cules d&rsquo;acide cis-urocanique en composants inoffensifs.<!--nextpage--> Une colonie de bact\u00e9ries absorbe ensuite les substances ainsi obtenues et les utilise comme source de nourriture. Sans l&rsquo;effet du rayonnement ultraviolet sur la peau, cela serait impossible, tout comme l&rsquo;existence m\u00eame des bact\u00e9ries.<\/p>\n<p>Il s&rsquo;av\u00e8re que les bact\u00e9ries neutralisent partiellement les dommages caus\u00e9s par le rayonnement ultraviolet \u00e0 la peau, qui sont \u00e0 l&rsquo;origine de leur existence. Ce n&rsquo;est pas une protection compl\u00e8te compar\u00e9e aux produits synth\u00e9tiques, mais c&rsquo;est un exemple int\u00e9ressant de symbiose.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Il est erron\u00e9 de consid\u00e9rer le rayonnement ultraviolet comme quelque chose de n\u00e9gatif\u00a0: il s&rsquo;agit simplement d&rsquo;une puissante source d&rsquo;influence externe sur tout ce qu&rsquo;il touche. Tout d\u00e9pend alors de&hellip;<\/p>\n","protected":false},"author":2,"featured_media":70,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-91","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-science"],"_links":{"self":[{"href":"https:\/\/commidisac.com\/index.php?rest_route=\/wp\/v2\/posts\/91","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/commidisac.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/commidisac.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/commidisac.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/commidisac.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=91"}],"version-history":[{"count":1,"href":"https:\/\/commidisac.com\/index.php?rest_route=\/wp\/v2\/posts\/91\/revisions"}],"predecessor-version":[{"id":92,"href":"https:\/\/commidisac.com\/index.php?rest_route=\/wp\/v2\/posts\/91\/revisions\/92"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/commidisac.com\/index.php?rest_route=\/wp\/v2\/media\/70"}],"wp:attachment":[{"href":"https:\/\/commidisac.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=91"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/commidisac.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=91"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/commidisac.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=91"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}