{"id":4248,"date":"2022-04-26T09:50:23","date_gmt":"2022-04-26T07:50:23","guid":{"rendered":"https:\/\/lycee-raynouard.fr\/?p=4248"},"modified":"2022-04-26T09:50:25","modified_gmt":"2022-04-26T07:50:25","slug":"une-histoire-de-blob","status":"publish","type":"post","link":"https:\/\/lycee-raynouard.fr\/index.php\/2022\/04\/26\/une-histoire-de-blob\/","title":{"rendered":"Une histoire de BLOB"},"content":{"rendered":"\n<p><strong><u>Le Blob du Lyc\u00e9e<\/u><\/strong><\/p>\n\n\n\n<p>Notre lyc\u00e9e a \u00e9t\u00e9 s\u00e9lectionn\u00e9 avec d&rsquo;autres pour participer \u00e0 une action initi\u00e9e par le CNES (Centre National d\u2019Etudes Spatiales) et le CNRS (Centre National de la Recherche Scientifique), en liaison avec une chercheuse, Audrey Dussutour. Il s\u2019agissait de r\u00e9aliser les m\u00eames exp\u00e9riences sur le blob que celles r\u00e9alis\u00e9es par l\u2019astronaute Thomas Pesquet dans la station internationale pour voir l\u2019effet de la micropesanteur sur cet organisme.<\/p>\n\n\n\n<p>Nous avons ainsi re\u00e7u \u00e0 la rentr\u00e9e un kit de scl\u00e9rotes de Physarum polycephalum, une cr\u00e9ature tr\u00e8s \u00e9nigmatique, que nous avons pu \u00e9tudier avec la classe de 202. Il s\u2019agit de blobs endormis, s\u00e9ch\u00e9s sur un papier filtre qu\u2019il faut humidifier pour les r\u00e9veiller.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"474\" height=\"355\" src=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo1-scle\u0301rote.jpg\" alt=\"\" class=\"wp-image-4249\" srcset=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo1-scle\u0301rote.jpg 474w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo1-scle\u0301rote-300x225.jpg 300w\" sizes=\"auto, (max-width: 474px) 100vw, 474px\" \/><figcaption>Scl\u00e9rote<\/figcaption><\/figure>\n\n\n\n<p><br>Les objectifs \u00e9taient de :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>D\u00e9couvrir le Blob<\/li><li>Comprendre sa structure et son mode de d\u00e9veloppement<\/li><li>Pr\u00e9parer les futures exp\u00e9riences (identiques \u00e0 celles de Thomas Pesquet dans l\u2019ISS) \u2013<\/li><\/ul>\n\n\n\n<p>Dans un premier temps il a fallu le multiplier afin que chaque bin\u00f4me d\u2019\u00e9l\u00e8ves puisse \u00e9tudier un organisme, puis les rendormir pour obtenir de nouveaux scl\u00e9rotes utilisables dans le cadre de l\u2019exp\u00e9rimentation. Le blob \u00e9tant friand d\u2019avoine nous avons pu le cultiver en le d\u00e9posant sur des g\u00e9loses recouvertes d\u2019avoine.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo2-blob-en-culture-768x1024.jpg\" alt=\"\" class=\"wp-image-4250\" width=\"591\" height=\"788\" srcset=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo2-blob-en-culture-768x1024.jpg 768w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo2-blob-en-culture-225x300.jpg 225w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo2-blob-en-culture-1152x1536.jpg 1152w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo2-blob-en-culture-786x1048.jpg 786w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo2-blob-en-culture-1320x1760.jpg 1320w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo2-blob-en-culture.jpg 1536w\" sizes=\"auto, (max-width: 591px) 100vw, 591px\" \/><figcaption>Blob en culture<\/figcaption><\/figure>\n\n\n\n<p>Il a fallu aussi au pr\u00e9alable fabriquer une bo\u00eete (Blob Box) pour qu\u2019il puisse se d\u00e9velopper \u00e0 une faible luminosit\u00e9 pour ne pas le g\u00eaner tout en permettant son suivi.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo3-boite-768x1024.jpg\" alt=\"\" class=\"wp-image-4251\" srcset=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo3-boite-768x1024.jpg 768w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo3-boite-225x300.jpg 225w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo3-boite-1152x1536.jpg 1152w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo3-boite-1536x2048.jpg 1536w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo3-boite-786x1048.jpg 786w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo3-boite-1320x1760.jpg 1320w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo3-boite-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><figcaption>la boite \u00e0 Blob<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Enfin r\u00e9veill\u00e9 le Lundi 18 octobre, les Blobs du lyc\u00e9e ont donc commenc\u00e9 leur croissance et l\u2019exploration de bo\u00eetes de P\u00e9tri.<\/p>\n\n\n\n<p>Deux protocoles exp\u00e9rimentaux ont ainsi \u00e9t\u00e9 mise en \u0153uvre.<\/p>\n\n\n\n<p>-Le premier a permis de tester les capacit\u00e9s d\u2019exploration du blob, plac\u00e9 sur du papier-filtre dans une bo\u00eete de p\u00e9tri, sans nourriture. Des photographies r\u00e9guli\u00e8res du blob ont \u00e9t\u00e9 programm\u00e9es afin de mesurer sa structure et son d\u00e9placement. &nbsp;<\/p>\n\n\n\n<p>-Avec quatre flocons d\u2019avoine d\u00e9pos\u00e9s \u00e0 \u00e9quidistance, le second protocole a permis d\u2019appr\u00e9cier les m\u00eames param\u00e8tres quand le blob choisit une strat\u00e9gie pour se nourrir.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"473\" src=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo4-de\u0301but-1024x473.jpg\" alt=\"\" class=\"wp-image-4252\" srcset=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo4-de\u0301but-1024x473.jpg 1024w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo4-de\u0301but-300x139.jpg 300w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo4-de\u0301but-768x355.jpg 768w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo4-de\u0301but-1536x709.jpg 1536w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo4-de\u0301but-2048x946.jpg 2048w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo4-de\u0301but-786x363.jpg 786w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo4-de\u0301but-1320x610.jpg 1320w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>D\u00e9but du protocole<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Nous avons donc pu observer deux r\u00e9sultats :<\/p>\n\n\n\n<p>Le blob \u201cexploration\u201d, dans des conditions optimales mais sans aucune source de nourriture, est devenu scl\u00e9rote tr\u00e8s rapidement.<\/p>\n\n\n\n<p>Le blob \u201cexploitation\u201d, dans des conditions optimales et avec source de nourriture s\u2019est d\u00e9velopp\u00e9 vers les flocons d\u2019avoine<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"473\" src=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo5-fin-1024x473.jpg\" alt=\"\" class=\"wp-image-4253\" srcset=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo5-fin-1024x473.jpg 1024w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo5-fin-300x139.jpg 300w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo5-fin-768x355.jpg 768w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo5-fin-1536x709.jpg 1536w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo5-fin-2048x946.jpg 2048w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo5-fin-786x363.jpg 786w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo5-fin-1320x610.jpg 1320w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>fin du protocole<\/figcaption><\/figure>\n\n\n\n<p>Les photos prises pendant une semaine toutes les 30 minutes nous ont permis d\u2019obtenir un time laps. Le m\u00eame time-lapse a \u00e9t\u00e9 r\u00e9alis\u00e9 par Thomas Pesquet sous les m\u00eames conditions<\/p>\n\n\n\n<p>Vid\u00e9o de d\u00e9veloppement de notre blob:<\/p>\n\n\n\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" sandbox=\"allow-same-origin allow-scripts allow-popups\" src=\"https:\/\/tube-nice.beta.education.fr\/videos\/embed\/6f178bb4-ae6f-4672-93d2-3cb7ba5eddab\" frameborder=\"0\" allowfullscreen><\/iframe>\n\n\n\n<p>Voici les r\u00e9sultats de l\u2019exp\u00e9rience Blob-ISS : <a href=\"https:\/\/missionalpha.cnes.fr\/fr\/elevetonblob-resultats-iss\">https:\/\/missionalpha.cnes.fr\/fr\/elevetonblob-resultats-iss<\/a><\/p>\n\n\n\n<p>Malheureusement les donn\u00e9es sur l\u2019ISS ont \u00e9t\u00e9 corrompues, ce qui n\u2019a pas rendu facile leur analyse.&nbsp; Mais nous avons quand m\u00eame pu remarquer la rapidit\u00e9 avec laquelle les blobs construisent des fronts de migrations dans des directions totalement oppos\u00e9es. De plus, des blobs sans nourriture dans un environnement qui s&rsquo;ass\u00e8che (exploration) s&rsquo;endorment plus rapidement que des blobs qui ont acc\u00e8s \u00e0 une source de nourriture (exploitation). Enfin si les r\u00e9sultats de Thomas Pesquet sont dans les grandes lignes identiques, nous avons pu remarquer que dans l\u2019espace le blob a form\u00e9 des piliers en 3D notamment dans le protocole exploration.<\/p>\n\n\n\n<p>Outre les exp\u00e9riences r\u00e9alis\u00e9es, nous avons pu d\u00e9couvrir que le blob n\u2019est en r\u00e9alit\u00e9 compos\u00e9 que d\u2019une seule cellule mais que celle-ci peut \u00eatre gigantesque. Il s\u2019endort dans des conditions de s\u00e9cheresse, mais se r\u00e9veille en pr\u00e9sence d\u2019humidit\u00e9, plus jeune et vigoureux&nbsp;: il est donc immortel. Il est jaune vif et informe. En le regardant de pr\u00e8s, on per\u00e7oit un maillage de veines dans lesquelles circule le protoplasme, \u00ab&nbsp;le sang du blob&nbsp;\u00bb. Ce r\u00e9seau permet de distribuer tous les nutriments et autres mol\u00e9cules essentielles en un minimum de temps dans toute la cellule. Le blob est mobile, mais rassurez-vous, il ne vous rampera pas apr\u00e8s lors de l\u2019une de vos balades en for\u00eat&nbsp;!<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo6-maillage-blob.jpg\" alt=\"\" class=\"wp-image-4254\" srcset=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo6-maillage-blob.jpg 640w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo6-maillage-blob-300x225.jpg 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption>Maillage de Blob<\/figcaption><\/figure>\n\n\n\n<p>Depuis le blob est rendormi et attends sagement un nouveau r\u00e9veil \u2026 c\u2019est pr\u00e9vu pour bient\u00f4t avec certains \u00e9l\u00e8ves de premi\u00e8res dans le cadre du projet num\u00e9rique en enseignement scientifique.<br>La suite au prochain \u00e9pisode\u2026<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"461\" height=\"1024\" src=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo7-blobs-endormis-461x1024.jpg\" alt=\"\" class=\"wp-image-4255\" srcset=\"https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo7-blobs-endormis-461x1024.jpg 461w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo7-blobs-endormis-135x300.jpg 135w, https:\/\/lycee-raynouard.fr\/wp-content\/uploads\/2022\/04\/photo7-blobs-endormis.jpg 640w\" sizes=\"auto, (max-width: 461px) 100vw, 461px\" \/><figcaption>La belle au boisdorBlob<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Le Blob du Lyc\u00e9e Notre lyc\u00e9e a \u00e9t\u00e9 s\u00e9lectionn\u00e9 avec d&rsquo;autres pour participer \u00e0 une action initi\u00e9e par le CNES (Centre National d\u2019Etudes Spatiales) et le CNRS (Centre National de la Recherche Scientifique), en liaison avec une chercheuse, Audrey Dussutour. Il s\u2019agissait de r\u00e9aliser les m\u00eames exp\u00e9riences sur le blob que celles r\u00e9alis\u00e9es par l\u2019astronaute &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"https:\/\/lycee-raynouard.fr\/index.php\/2022\/04\/26\/une-histoire-de-blob\/\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[21,32],"tags":[],"class_list":["post-4248","post","type-post","status-publish","format-standard","hentry","category-actualites","category-svt","nodate","item-wrap"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Une histoire de BLOB - Lyc\u00e9e Polyvalent Raynouard<\/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:\/\/lycee-raynouard.fr\/index.php\/2022\/04\/26\/une-histoire-de-blob\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Une histoire de BLOB - Lyc\u00e9e Polyvalent Raynouard\" \/>\n<meta property=\"og:description\" content=\"Le Blob du Lyc\u00e9e Notre lyc\u00e9e a \u00e9t\u00e9 s\u00e9lectionn\u00e9 avec d&rsquo;autres pour participer \u00e0 une action initi\u00e9e par le CNES (Centre National d\u2019Etudes Spatiales) et le CNRS (Centre National de la Recherche Scientifique), en liaison avec une chercheuse, Audrey Dussutour. 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