{"id":7253,"date":"2019-09-26T09:44:50","date_gmt":"2019-09-26T07:44:50","guid":{"rendered":"https:\/\/www.mio.osupytheas.fr\/fr\/archive_page\/bacstress\/"},"modified":"2019-09-26T09:44:50","modified_gmt":"2019-09-26T07:44:50","slug":"bacstress","status":"publish","type":"archive_page","link":"https:\/\/www.mio.osupytheas.fr\/fr\/bacstress\/","title":{"rendered":"BACSTRESS"},"content":{"rendered":"<div id=\"basic-page-content\" class=\"page-content\">    <div class=\"content\">    <div class=\"container-fluid\">      <div class=\"row\">                  <div class=\"container clearfix\">            <div class=\"row\">              <div class=\"col-xs-12\">                              <\/div>            <\/div>          <\/div>                                  <div class=\"paragraphs\">            <div class=\"paragraphs-items paragraphs-items-field-paragraphs paragraphs-items-field-paragraphs-full paragraphs-items-full\">  <div class=\"field field-name-field-paragraphs field-type-paragraphs field-label-hidden\"><div class=\"field-items\"><div class=\"field-item even\"><section class=\"paragraph-section paragraph-texte-simple paragraph-blanc\">  <div class=\"container\">             <div class=\"paragraph-content\">        <h3 class=\"rtejustify\"><strong>Etude du stress oxique et osmotique des bact\u00e9ries en Arctique : implications sur la pr\u00e9servation du mat\u00e9riel algal<\/strong><\/h3><p class=\"rtejustify\">\u00a0<\/p><p class=\"rtejustify\"><strong>PI MIO<\/strong> : <a href=\"mailto:jean-francois.rontani@mio.osupytheas.fr\" target=\"_blank\" rel=\"noopener\">Jean Fran\u00e7ois Rontani <\/a><\/p><p class=\"rtejustify\"><strong>Participants MIO<\/strong> : J-F Rontani, P. Bonin, G. Simon, L. Casalot, S. Guasco, F. Vaultier, M. Lescot, F. Armougom et C. Burot<\/p><p class=\"rtejustify\">\u00a0<\/p><h4 class=\"rtejustify\"><strong>Description<\/strong><\/h4><p class=\"rtejustify\">Le projet <strong>BACSTRESS <\/strong>(2017-2019) est financ\u00e9 par l\u2019initiative structurante EC2CO-Microbien du CNRS.<\/p><p class=\"rtejustify\">L\u2019<strong>objectif principal<\/strong> de ce projet pluridisciplinaire (\u00e9cologie microbienne et biog\u00e9ochimie organique) est\u00a0 de d\u00e9terminer l\u2019\u00e9tat de stress des bact\u00e9ries associ\u00e9es aux algues de glace dans la banquise et en eau libre en Arctique et d\u2019estimer son impact sur la pr\u00e9servation du mat\u00e9riel algal.\u00a0<\/p><p class=\"rtejustify\">\u00a0<\/p><h4 class=\"rtejustify\"><strong>Avancement du projet<\/strong><\/h4><p class=\"rtejustify\">Lors de la premi\u00e8re ann\u00e9e du projet, nous avons pu :<\/p><ul><li class=\"rtejustify\">Mettre en \u00e9vidence une forte mortalit\u00e9 (&gt;60%) des bact\u00e9ries attach\u00e9es aux algues de glace en d\u00e9but et en fin de fonte de la banquise. Il est important de noter que le mauvais \u00e9tat physiologique des bact\u00e9ries en fin de fonte (au moment o\u00f9 les flux de mat\u00e9riel algal vers le fond sont maxima) doit donc contribuer \u00e0 une bonne pr\u00e9servation des algues de glace.<\/li><li class=\"rtejustify\">Montrer l\u2019existence d\u2019un stress suppl\u00e9mentaire \u2018chimique\u2019 (toxicit\u00e9 des acides gras libres des algues de glace vis-\u00e0-vis des bact\u00e9ries) que nous n\u2019avions pas envisag\u00e9 initialement et qu\u2019il faudra prendre en compte lors de la deuxi\u00e8me ann\u00e9e du projet.<\/li><li class=\"rtejustify\">D\u00e9montrer que l\u2019acide 10S-hydrop\u00e9roxyhexadec-8(trans)-\u00e8noique largement r\u00e9pandu en Arctique r\u00e9sultait de l\u2019action d\u2019une 10S-DOX bact\u00e9rienne sur les algues de glace et qu\u2019il constituait donc un traceur de la d\u00e9gradation bact\u00e9rienne de ces derni\u00e8res.<\/li><\/ul>      <\/div>      <\/div><\/section><\/div><div class=\"field-item odd\"><section class=\"paragraph-section paragraph-texte-simple paragraph-bleu\">  <div class=\"container\">             <div class=\"paragraph-content\">        <table align=\"center\" border=\"0\" cellpadding=\"1\" cellspacing=\"1\"><tbody><tr><td><a href=\"\/wp-content\/uploads\/ancien-site\/images\/schema2.png\" class=\"colorbox-load\"><img fetchpriority=\"high\" decoding=\"async\" alt=\"\" src=\"\/wp-content\/uploads\/ancien-site\/resize\/images\/schema2-710x600.png\" style=\"height: 600px; width: 710px;\" width=\"710\" height=\"600\"><\/a><\/td><td><a href=\"\/wp-content\/uploads\/ancien-site\/images\/schema3.png\" class=\"colorbox-load\"><img decoding=\"async\" alt=\"\" src=\"\/wp-content\/uploads\/ancien-site\/resize\/images\/schema3-858x600.png\" style=\"width: 858px; height: 600px;\" width=\"858\" height=\"600\"><\/a><\/td><\/tr><\/tbody><\/table>      <\/div>      <\/div><\/section><\/div><div class=\"field-item even\"><section class=\"paragraph-section paragraph-texte-simple paragraph-blanc\">  <div class=\"container\">             <div class=\"paragraph-content\">        <h4 class=\"rtejustify\"><strong>Publications<\/strong><\/h4><ul><li class=\"rtejustify\">Amiraux R., Belt, S.T., <strong>Vaultier F<\/strong>., Galindo V., Gosselin M., Bonin P. et <strong>Rontani J-F<\/strong>. (2017). Monitoring of photooxidative and osmotic bacterial stresses in Arctic using specific lipid tracers. Mar. Chem. 194: 89-99.<br>\t\u00a0<\/li><li class=\"rtejustify\"><strong>Rontani J-F<\/strong>., Amiraux R., Lalande C., Babin M., Kim H-R. et Belt S.T. (2018). Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments. Org. Geochem. 124: 88-102.<\/li><\/ul>      <\/div>      <\/div><\/section><\/div><div class=\"field-item odd\"><section class=\"paragraph-section paragraph-texte-simple paragraph-gris\">  <div class=\"container\">             <div class=\"paragraph-content\">        <table align=\"center\" border=\"0\" cellpadding=\"1\" cellspacing=\"1\"><tbody><tr><td class=\"rtecenter\"><a href=\"\/wp-content\/uploads\/ancien-site\/images\/2015-11-27_15.50.20.jpg\" class=\"colorbox-load\"><img decoding=\"async\" alt=\"\" src=\"\/wp-content\/uploads\/ancien-site\/resize\/images\/2015-11-27_15.50.20-1100x619.jpg\" style=\"width: 1100px; height: 619px;\" width=\"1100\" height=\"619\"><\/a><\/td><\/tr><tr><td class=\"rtecenter\"><h4>GC-Qtof<\/h4><\/td><\/tr><\/tbody><\/table>      <\/div>      <\/div><\/section><\/div><\/div><\/div><\/div>            <\/div>                                      <\/div>    <\/div>  <\/div><\/div>","protected":false},"featured_media":4489,"parent":0,"template":"","class_list":["post-7253","archive_page","type-archive_page","status-publish","has-post-thumbnail","hentry"],"acf":{"id_old":"2276","category_old":"Biodiversit\u00e9 marine & organismes vivants"},"_links":{"self":[{"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/archive_page\/7253","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/archive_page"}],"about":[{"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/types\/archive_page"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/media\/4489"}],"wp:attachment":[{"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/media?parent=7253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}