{"id":11215,"date":"2025-01-31T06:37:08","date_gmt":"2025-01-31T05:37:08","guid":{"rendered":"https:\/\/fermi.univ-tlse3.fr\/?post_type=tribe_events&#038;p=11215"},"modified":"2025-01-31T10:46:35","modified_gmt":"2025-01-31T09:46:35","slug":"tba-serge-dmitrieff-lpt-seminar-4-02-2025-14h","status":"publish","type":"tribe_events","link":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/tba-serge-dmitrieff-lpt-seminar-4-02-2025-14h\/","title":{"rendered":"Pushing and pulling forces by actin : from microscopic to macroscopic models. &#8211; (Serge Dmitrieff \/ LPT \/ Seminar). &#8211; 4\/02\/2025, 14H"},"content":{"rendered":"<p><span style=\"font-size: 20px; background-color: #f18500;\">S\u00e9minaire LPT<\/span><\/p>\n<p><span style=\"font-size: 20px;\"><span style=\"color: #191970;\"><strong>Serge Dmitrieff <\/strong><\/span>(Institut Jacques Monod)<\/span><\/p>\n<p><span style=\"background-color: #cecece;\">Seminar LPT, 4\/02\/2025, 14H, 3R4, salle de conf\u00e9rence<\/span><\/p>\n<p><strong>Summary :<\/strong><br \/>\nActin networks generate large forces at the cellular scale. In this talk, we will use a combination of simulations and analytical models to understand how macroscopic mechanics emerge from microscopic elements. In particular, we will be interested in pushing forces by actin, that can reach tens of nanoNewton of magnitude in-vivo. These forces emerge from the energy gained by filament polymerization and network mechanics. We show that the growth speed and pushing force of actin networks can be predicted by scaling arguments. We will also consider contractile actin-myosin networks, such as cellular cortex. These networks are usually represented theoretically as active gels. Scaling arguments predict which forms of actin gels are good representation of actin networks \u2013 which we can verify in simulations. We can also predict how the contractile term depends on network architecture and myosin properties.<\/p>\n<hr \/>\n<div class=\"leaflet-map WPLeafletMap\" style=\"height:300px; width:70%;\"><\/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>; \\u00a9 <a href=\\\"http:\\\/\\\/www.openstreetmap.org\\\/copyright\\\">OpenStreetMap<\\\/a> contributeurs\"},\n    {});\nwindow.WPLeafletMapPlugin.createMap(options).setView([43.560830727361,1.4672373725804],16);window.WPLeafletMapPlugin.createScale({});});<\/script>\n<script>\nwindow.WPLeafletMapPlugin = window.WPLeafletMapPlugin || [];\nwindow.WPLeafletMapPlugin.push(function WPLeafletMarkerShortcode() {\/*<script>*\/\nvar map = window.WPLeafletMapPlugin.getCurrentMap();\nvar group = window.WPLeafletMapPlugin.getCurrentGroup();\nvar marker_options = window.WPLeafletMapPlugin.getIconOptions({});\nvar marker = L.marker(\n    [0,0],\n    marker_options\n);\nvar is_image = map.is_image_map;\n    marker.setLatLng( map.getCenter() );\nif (marker_options.draggable) {\n    marker.on('dragend', function () {\n        var latlng = this.getLatLng();\n        var lat = latlng.lat;\n        var lng = latlng.lng;\n        if (is_image) {\n            console.log('leaflet-marker y=' + lat + ' x=' + lng);\n        } else {\n            console.log('leaflet-marker lat=' + lat + ' lng=' + lng);\n        }\n    });\n}\nmarker.addTo( group );\nmarker.bindPopup(window.WPLeafletMapPlugin.unescape('Salle de conf\u00e9rence (- B\u00e2timent 3R4)'));window.WPLeafletMapPlugin.markers.push( marker );\n        });<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Location : Seminar Room, 3R4<\/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":"","neve_meta_reading_time":"","_tribe_events_status":"","_tribe_events_status_reason":"","footnotes":""},"tags":[],"tribe_events_cat":[48,313,233],"class_list":["post-11215","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 - 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