{"id":9328,"date":"2023-11-02T08:43:10","date_gmt":"2023-11-02T07:43:10","guid":{"rendered":"https:\/\/fermi.univ-tlse3.fr\/?post_type=tribe_events&#038;p=9328"},"modified":"2023-11-02T10:33:51","modified_gmt":"2023-11-02T09:33:51","slug":"instabilities-and-geometry-of-growing-tissues-doron-grossman-lpt-seminar-07-11-2023-14-h","status":"publish","type":"tribe_events","link":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/instabilities-and-geometry-of-growing-tissues-doron-grossman-lpt-seminar-07-11-2023-14-h\/","title":{"rendered":"Instabilities and Geometry of Growing Tissues. &#8211; (Doron Grossman  \/ LPT \/ Seminar). &#8211; 07\/11\/2023, 14 H."},"content":{"rendered":"<p><span style=\"font-size: 20px;\"><span style=\"color: #191970;\"><strong>Doron Grossman <\/strong><\/span> (LPT)<\/span><\/p>\n<p><span style=\"background-color: #cecece;\">Seminar LPT, 7\/11\/2023, 14H, 3R1, seminar room, 3rd floor<\/span><\/p>\n<p><strong><span style=\"font-size: 20px; color: #191970;\">Summary<\/span> :<\/strong><br \/>\nWe present a covariant continuum formulation of a generalized two-dimensional vertexlike model of epithelial tissues which describes tissues with different underlying geometries, and allows for an analytical macroscopic description. Using a geometrical approach and out-of-equilibrium statistical mechanics, we calculate both mechanical and dynamical instabilities of a tissue, and their dependencies on various variables, including activity, and cell-shape heterogeneity (disorder). We show how both plastic cellular rearrangements and the tissue elastic response depend on the existence of mechanical residual stresses at the cellular level. Even freely growing tissues may exhibit a growth instability depending on the intrinsic proliferation rate. Our main result is an explicit calculation of the cell pressure in a homeostatic state of a confined growing tissue. We show that the homeostatic pressure can be negative and depends on the existence of mechanical residual stresses. This geometric model allows us to sort out elastic and plastic effects in a growing, flowing, tissue. We calculate the rheological response of such a living tissue, and show that it can exhibit shear thinning, shear thickening and thixotropic behaviour, depending on the condition.<\/p>\n<hr \/>\n<div class=\"leaflet-map WPLeafletMap\" style=\"height:300px; width:80%;\"><\/div><script>\nwindow.WPLeafletMapPlugin = window.WPLeafletMapPlugin || [];\nwindow.WPLeafletMapPlugin.push(function WPLeafletMapShortcode() {\/*<script>*\/\nvar baseUrl = atob('aHR0cHM6Ly97c30udGlsZS5vcGVuc3RyZWV0bWFwLm9yZy97en0ve3h9L3t5fS5wbmc=');\nvar base = (!baseUrl && window.MQ) ?\n    window.MQ.mapLayer() : L.tileLayer(baseUrl,\n        L.Util.extend({}, {\n            detectRetina: 0,\n        },\n        {\"subdomains\":\"abc\",\"noWrap\":false,\"maxZoom\":18}        )\n    );\n    var options = L.Util.extend({}, {\n        layers: [base],\n        attributionControl: false\n    },\n    {\"zoomControl\":true,\"scrollWheelZoom\":true,\"doubleClickZoom\":true,\"fitBounds\":true,\"minZoom\":9,\"maxZoom\":18,\"maxBounds\":null,\"attribution\":\"<a href=\\\"http:\\\/\\\/leafletjs.com\\\" title=\\\"Une biblioth\\u00e8que JS pour des cartes interactives\\\">Leaflet<\\\/a>; 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(Doron Grossman  \/ LPT \/ Seminar). &#8211; 07\/11\/2023, 14 H.<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_tribe_events_status":"","_tribe_events_status_reason":"","footnotes":""},"tags":[],"tribe_events_cat":[48,313,233],"class_list":["post-9328","tribe_events","type-tribe_events","status-publish","hentry","tribe_events_cat-events","tribe_events_cat-lpt","tribe_events_cat-seminars","cat_events","cat_lpt","cat_seminars"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Instabilities and Geometry of Growing Tissues. - (Doron Grossman \/ LPT \/ Seminar). - 07\/11\/2023, 14 H. - FeRMI<\/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:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/instabilities-and-geometry-of-growing-tissues-doron-grossman-lpt-seminar-07-11-2023-14-h\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Instabilities and Geometry of Growing Tissues. - (Doron Grossman \/ LPT \/ Seminar). - 07\/11\/2023, 14 H. - FeRMI\" \/>\n<meta property=\"og:description\" content=\"Doron Grossman (LPT) Seminar LPT, 7\/11\/2023, 14H, 3R1, seminar room, 3rd floor Summary : We present a covariant continuum formulation of a generalized two-dimensional vertexlike model of epithelial tissues which&hellip;&nbsp;Lire la suite &raquo;Instabilities and Geometry of Growing Tissues. &#8211; 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