{"id":70030,"date":"2018-03-09T23:14:33","date_gmt":"2018-03-09T23:14:33","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/elementos-estructurales-de-la-cromatina-en-el-interior-de-los-cromosomas-mitoticos\/"},"modified":"2018-03-09T23:14:33","modified_gmt":"2018-03-09T23:14:33","slug":"elementos-estructurales-de-la-cromatina-en-el-interior-de-los-cromosomas-mitoticos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/elementos-estructurales-de-la-cromatina-en-el-interior-de-los-cromosomas-mitoticos\/","title":{"rendered":"Elementos estructurales de la cromatina en el interior de los cromosomas mit\u00f3ticos"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Caravaca Guasch Juan  Manuel <\/strong><\/h2>\n<p>Nuestro grupo ha estudiado la estructura de la cromatina de n\u00facleos de eritrocitos de pollo (bartolom\u00e9 et al., 1994; bartolom\u00e9 et al., 1995; berm\u00fadez et al., 1998). La consecuencia de estos estudios ha sido la elaboraci\u00f3n de un modelo para el plegamiento de la fibra de cromatina con una elevada concentraci\u00f3n local del dna (daban y berm\u00fadez, 1998; daban, 2000). Sin embargo, el nivel m\u00e1ximo de condensaci\u00f3n en la cromatina, se encuentra en el interior de los cromosomas metaf\u00e1sicos. Aunque la bibliograf\u00eda ha planteado diferentes modelos para el plegamiento de la cromatina en el interior de \u00e9stos, existe un conocimiento muy escaso acerca de la estructura molecular de la cromatina en los cromosomas condensados.  se ha realizado un estudio exhaustivo de microscop\u00eda electr\u00f3nica de transmisi\u00f3n sobre la estructura de los cromosomas metaf\u00e1sicos de c\u00e9lulas hela. Se han estudiado un total de 4410 micrograf\u00edas de cromosomas metaf\u00e1sicos, que en su mayor parte han sido tratados con diversos medios parcialmente desnaturalizantes, para pode analizar su estructura interna.  morfol\u00f3gicamente, los cromosomas estudiados en este trabajo pueden agruparse en tres tipos diferentes: compactos, granulados y fibrilados. La morfolog\u00eda m\u00e1s abundante es la compacta y se observa en presencia de cationes monovalentes y divalentes a concentraci\u00f3n similar a la presente en la cromatina metaf\u00e1sica (mg2+ 1.7-40 mm). Estos cromosomas tienen las crom\u00e1tidas muy densas y en sus bordes se aprecian una serie de estructuras planas superpuestas. En condiciones de menor concentraci\u00f3n de cationes (mg2+ menor 1.7 mm), la morfolog\u00eda dominante es la granular. Estos cromosomas est\u00e1n compuestos principalmente por gran cantidad de cuerpos  circulares de 30-40 nm de di\u00e1metro. \u00faNicamente en condiciones de fuerza i\u00f3nica extremadamente baja podemos encontrar la morfolog\u00eda fibrilar, la cual se caracteriza por la abundancia de fibras de 30-40 nm.  los resultados ob<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Elementos estructurales de la cromatina en el interior de los cromosomas mit\u00f3ticos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Elementos estructurales de la cromatina en el interior de los cromosomas mit\u00f3ticos <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Caravaca Guasch Juan  Manuel <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 16\/09\/2004<\/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>Joan Ramon Daban Bala\u00f1a<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Juan  Antonio Subirana torrent <\/li>\n<li>Luis Franco vera (vocal)<\/li>\n<li>Jos\u00e9 Egozcue cuixart (vocal)<\/li>\n<li>joaquim Roca  bosch (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Caravaca Guasch Juan Manuel Nuestro grupo ha estudiado la estructura de la cromatina de n\u00facleos de eritrocitos [&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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