{"id":54743,"date":"2018-03-09T22:42:27","date_gmt":"2018-03-09T22:42:27","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/caracterizacion-estatica-y-dinamica-de-sistemas-fosfola%c2%adpido-tensioactivo\/"},"modified":"2018-03-09T22:42:27","modified_gmt":"2018-03-09T22:42:27","slug":"caracterizacion-estatica-y-dinamica-de-sistemas-fosfola%c2%adpido-tensioactivo","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/bioquimica\/caracterizacion-estatica-y-dinamica-de-sistemas-fosfola%c2%adpido-tensioactivo\/","title":{"rendered":"Caracterizaci\u00f3n est\u00e1tica y din\u00e1mica de sistemas fosfol\u00edpido-tensioactivo"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Joedmi Pereira Lachataignerais <\/strong><\/h2>\n<p>Las ves\u00edculas lip\u00eddicas constituyen sistemas de gran inter\u00e9s debido a su similitud con las membranas celulares. El objeto de estudio de esta tesis ha sido la interacci\u00f3n de liposomas con tensioactivos, la incorporaci\u00f3n de colesterol y tensioactivo en la bicapa lip\u00eddica, as\u00ed como sus propiedades mec\u00e1nicas. As\u00ed, han sido formados sistemas de liposomas de fosfatidilcolina (pc) aplicando energ\u00eda de ultrasonidos a dispersiones previamente extru\u00eddas. Establecer el tiempo y la potencia de sonicaci\u00f3n permiti\u00f3 obtener ves\u00edculas con bajo grado de polidispersi\u00f3n y lamelaridad. el comportamiento viscoel\u00e1stico de dispersiones concentradas de liposomas ha sido comparado con sistemas de emulsiones, ampliamente estudiados a trav\u00e9s de reolog\u00eda. han sido detectados dos comportamientos diferentes con la disminuci\u00f3n de la fracci\u00f3n de volumen: comportamiento de s\u00f3lido el\u00e1stico de phi=0,95 a phi=0,86, lo cual ha permitido fijar una fracci\u00f3n de volumen cr\u00edtica, y como l\u00edquido viscoel\u00e1stico de phi=0,83 a phi=0,50. Se propuso una estructura compacta de las ves\u00edculas para poder explicar la resistencia a la deformaci\u00f3n a altas fracciones de volumen, esto fue considerado como un facto de obstrucci\u00f3n en las medidas de conductividad. se estudiaron las multicapas formadas por dioleoil fosfatidilcolina (dopc),mezclas de dopc-dodecil sulfato s\u00f3dico (sds) y dopc-sds-colesterol empleado la t\u00e9cnica de difracci\u00f3n de rayos-x a \u00e1ngulo rasante (gisax). Las multicapas ordenadas mostraron la presencia de la fase tridimensional rombo\u00e9drica (r) a bajas condiciones de hidrataci\u00f3n (rh=1 y 30%), mientras que con el incremento de la humedad relativa (rh=65%) se detect\u00f3 \u00fanicamente la presencia de una fase lamelar (l). As\u00ed, en las muestras dopc\/sds el contenido de tensioactivo parece incrementar la distancia entre los poros de la fase r, sin embargo, el sds no afecta notablemente la distancia de repetici\u00f3n lamelar. El diferente contenido de colesterol en las bicapas mostr\u00f3<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Caracterizaci\u00f3n est\u00e1tica y din\u00e1mica de sistemas fosfol\u00edpido-tensioactivo<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Caracterizaci\u00f3n est\u00e1tica y din\u00e1mica de sistemas fosfol\u00edpido-tensioactivo <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Joedmi Pereira Lachataignerais <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 27\/09\/2006<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Ramon Pons Pons<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 Mar\u00eda Guti\u00e9rrez gonz\u00e1lez <\/li>\n<li>mercedes Valiente mart\u00ednez (vocal)<\/li>\n<li>Jos\u00e9 Luis Parra juez (vocal)<\/li>\n<li>pascal Panizza (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Joedmi Pereira Lachataignerais Las ves\u00edculas lip\u00eddicas constituyen sistemas de gran inter\u00e9s debido a su similitud con las [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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