{"id":98147,"date":"2018-03-11T10:18:53","date_gmt":"2018-03-11T10:18:53","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/regulacion-electrostatica-del-transporte-ionica-en-el-poro-bacterial-ompf\/"},"modified":"2018-03-11T10:18:53","modified_gmt":"2018-03-11T10:18:53","slug":"regulacion-electrostatica-del-transporte-ionica-en-el-poro-bacterial-ompf","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/regulacion-electrostatica-del-transporte-ionica-en-el-poro-bacterial-ompf\/","title":{"rendered":"Regulaci\u00f3n electrost\u00e1tica del transporte i\u00f3nica en el poro bacterial ompf"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Elena Garc\u00eda Gim\u00e9nez <\/strong><\/h2>\n<p>El canal i\u00f3nico ompf se encuentra en la membrana externa de la bacteria escherichia coli. Este canal forma un poro ancho a trav\u00e9s de la membrana que permite el intercambio de iones y solutos entre los lados peripl\u00e1smico y extracelular. La regulaci\u00f3n del transporte de iones a trav\u00e9s de \u00e9l est\u00e1 fundamentalmente dominada por interacciones electrost\u00e1ticas de largo alcance. Es por ello que las propiedades del canal tienen una dependencia con la concentraci\u00f3n absoluta de sal (manteniendo constante el gradiente de concentraci\u00f3n) y con el ph del medio. el ph modifica el estado de carga de los residuos ionizables del canal. De hecho, la modificaci\u00f3n del ph de las disoluciones adyacentes al canal favorece una distribuci\u00f3n asim\u00e9trica de la carga convirtiendo un canal pr\u00e1cticamente \u00f3hmico en un canal rectificador de la corriente. Asimismo, las medidas del potencial a corriente cero en condiciones asim\u00e9tricas de ph proporcionan informaci\u00f3n sobre la concentraci\u00f3n de carga fija positiva y negativa en una distribuci\u00f3n bipolar en base a lo que el formalismo poisson-nernst-planck predice para una membrana bipolar con un balance equilibrado entre la concentraci\u00f3n de carga positiva y negativa: una selectividad direccional. las medidas de selectividad realizadas en disoluciones con diferentes electrolitos permiten la identificaci\u00f3n de otras contribuciones a la selectividad. Por una parte, medidas realizadas con distintos iones monovalentes demuestran el papel de la difusi\u00f3n i\u00f3nica en la selectividad. Esta contribuci\u00f3n es debida a la diferente movilidad de los cationes y aniones de la disoluci\u00f3n. Por otra parte, medidas realizadas en presencia de cationes divalentes sugieren la existencia de un binding site de cationes divalentes en el canal, con la consecuente posibilidad de que se produzca un fen\u00f3meno de inversi\u00f3n de carga en el canal. Sin embargo, ser\u00e1n necesarios estudios con mutantes del canal ompf para ver sin ninguna ambiguedad que el fen\u00f3meno de inversi\u00f3n de carga puede tener lugar.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Regulaci\u00f3n electrost\u00e1tica del transporte i\u00f3nica en el poro bacterial ompf<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Regulaci\u00f3n electrost\u00e1tica del transporte i\u00f3nica en el poro bacterial ompf <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Elena Garc\u00eda Gim\u00e9nez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Jaume i de castell\u00f3n<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 17\/12\/2009<\/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>Vicente Manuel Aguilella Fern\u00e1ndez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: salvador Maf\u00e9 matoses <\/li>\n<li>Jos\u00e9 Manuel Gonzalez ros (vocal)<\/li>\n<li>jordi Faraudo gener (vocal)<\/li>\n<li>Jos\u00e9 Antonio Manzanares andreu (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Elena Garc\u00eda Gim\u00e9nez El canal i\u00f3nico ompf se encuentra en la membrana externa de la bacteria escherichia [&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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