{"id":1183,"date":"2020-04-15T09:47:42","date_gmt":"2020-04-15T07:47:42","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/lehning\/?p=1183"},"modified":"2020-04-26T17:26:10","modified_gmt":"2020-04-26T15:26:10","slug":"la-chiralite-des-cochons-et-des-escargots","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/lehning\/2020\/04\/15\/la-chiralite-des-cochons-et-des-escargots\/","title":{"rendered":"La chiralit\u00e9 des cochons et des escargots"},"content":{"rendered":"<p><span style=\"font-family: 'Arial',sans-serif\">Les coquilles des escargots sont des spirales qui peuvent cro\u00eetre de mani\u00e8re dextre ou senestre. En fait, ils sont presque tous dextres. Seuls un sur dix mille est senestre dans l\u2019esp\u00e8ce des petits gris mais il existe des esp\u00e8ces o\u00f9 c\u2019est le contraire.<\/span><\/p>\n<figure id=\"attachment_1184\" aria-describedby=\"caption-attachment-1184\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1184 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/03\/Chiralite1-300x225.png\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/03\/Chiralite1-300x225.png 300w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/03\/Chiralite1.png 472w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-1184\" class=\"wp-caption-text\">Un petit gris. Si on place sa t\u00eate \u00e0 gauche, sa coquille s\u2019enroule dans le sens trigonom\u00e9trique.<\/figcaption><\/figure>\n<p>Les tire-bouchons usuels, c&#8217;est-\u00e0-dire pour droitiers, sont dextres, les tire-bouchons pour gauchers sont senestres.<\/p>\n<figure id=\"attachment_1187\" aria-describedby=\"caption-attachment-1187\" style=\"width: 227px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1187 size-full\" src=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/03\/Torsion2.png\" alt=\"\" width=\"227\" height=\"227\" srcset=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/03\/Torsion2.png 227w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/03\/Torsion2-150x150.png 150w\" sizes=\"auto, (max-width: 227px) 100vw, 227px\" \/><figcaption id=\"caption-attachment-1187\" class=\"wp-caption-text\">Un tire-bouchon dextre.<\/figcaption><\/figure>\n<h2>Les queues de cochons<\/h2>\n<p><span style=\"font-family: 'Arial',sans-serif\">De m\u00eame la queue en tire-bouchon des cochons peut \u00eatre dextre ou senestre. Dans ce cas, il se trouve qu\u2019il y a autant de cochons dextres que de cochons senestres. Le sexe des cochons m\u00e2les a la m\u00eame propri\u00e9t\u00e9. Ces diff\u00e9rences entre dextre et senestre se retrouvent au niveau des mol\u00e9cules, ce qui a parfois des cons\u00e9quences sur leurs propri\u00e9t\u00e9s.<\/span><\/p>\n<h2>Le pangolin en boule<\/h2>\n<p>Pour \u00e9chapper \u00e0 ses pr\u00e9dateurs, le pangolin (oui, le mammif\u00e8re impliqu\u00e9 dans l&#8217;origine du Covid-19) se roule en boule, ce qui le rend vuln\u00e9rable aux braconniers.<\/p>\n<figure id=\"attachment_1270\" aria-describedby=\"caption-attachment-1270\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1270 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/04\/pangolin-en-boule-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/04\/pangolin-en-boule-300x300.jpg 300w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/04\/pangolin-en-boule-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2020\/04\/pangolin-en-boule.jpg 383w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-1270\" class=\"wp-caption-text\">Pangolin en boule<\/figcaption><\/figure>\n<p>D&#8217;o\u00f9 la question : existe-t-il deux sortes de pangolins selon l&#8217;orientation de la boule ?<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Les coquilles des escargots sont des spirales qui peuvent cro\u00eetre de mani\u00e8re dextre ou senestre. En fait, ils sont presque tous dextres. Seuls un sur dix mille est senestre dans l\u2019esp\u00e8ce des petits gris mais il existe des esp\u00e8ces o\u00f9 c\u2019est le contraire. Les tire-bouchons usuels, c&#8217;est-\u00e0-dire pour droitiers, sont dextres, les tire-bouchons pour gauchers &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/lehning\/2020\/04\/15\/la-chiralite-des-cochons-et-des-escargots\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La chiralit\u00e9 des cochons et des escargots<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":12,"featured_media":1186,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[248,67,29,11],"tags":[119,120,450,122,449],"class_list":["post-1183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biologie","category-ecologie","category-maths-2","category-nature","tag-chiralite","tag-cochon","tag-covid-19","tag-escargot","tag-pangolin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La chiralit\u00e9 des cochons et des escargots, par Herv\u00e9 Lehning<\/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:\/\/blogs.futura-sciences.com\/lehning\/2020\/04\/15\/la-chiralite-des-cochons-et-des-escargots\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La chiralit\u00e9 des cochons et des escargots, par Herv\u00e9 Lehning\" \/>\n<meta property=\"og:description\" content=\"Les coquilles des escargots sont des spirales qui peuvent cro\u00eetre de mani\u00e8re dextre ou senestre. En fait, ils sont presque tous dextres. Seuls un sur dix mille est senestre dans l\u2019esp\u00e8ce des petits gris mais il existe des esp\u00e8ces o\u00f9 c\u2019est le contraire. 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