{"id":78777,"date":"2018-03-09T23:24:31","date_gmt":"2018-03-09T23:24:31","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/aspergillus-seccion-nigri-estudio-fisiologico-y-molecular-de-especies-ocratoxa%c2%adgenas\/"},"modified":"2018-03-09T23:24:31","modified_gmt":"2018-03-09T23:24:31","slug":"aspergillus-seccion-nigri-estudio-fisiologico-y-molecular-de-especies-ocratoxa%c2%adgenas","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/aspergillus-seccion-nigri-estudio-fisiologico-y-molecular-de-especies-ocratoxa%c2%adgenas\/","title":{"rendered":"Aspergillus secci\u00f3n nigri: estudio fisiol\u00f3gico y molecular de especies ocratox\u00edgenas"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Alexandre Esteban Franco <\/strong><\/h2>\n<p>La presente memoria de tesis doctoral, presentada en forma de compendio de publicaciones, recoge el estudio fisiol\u00f3gico y molecular realizado con especies del g\u00e9nero aspergillus secci\u00f3n nigiri productoras de ocratoxina a (ota). Esta micotoxina est\u00e1 recibiendo una especial atenci\u00f3n en todo el mundo debido a su marcado car\u00e1cter nefrot\u00f3xico. Adem\u00e1s, es una sustancia carcin\u00f3gena, terat\u00f3gena e inmunot\u00f3xica y desde el a\u00f1o 2002, la ue ha comenzado a establecer niveles m\u00e1ximos de esta micotoxina en algunos alimentos. Estudios muy recientes han puesto claramente de manifiesto la implicaci\u00f3n de algunas especies del g\u00e9nero aspergillus de la secci\u00f3n nigri (a.Carbonarius y las incluidas en el \u00abagregado a.Niger\u00bb) en la presencia de ota en alimentos como la uva, las pasas y el vino, entre otros. No obstante, no se conocen hasta el momento las condiciones ambientales que favorecen la producci\u00f3n de la micotoxina por estas especies.     en los modelos fisiol\u00f3gicos utilizados, se han incluido cepas de a.Carbonarius y del agregado a.Niger, seleccionadas en  base a su diferente origen y capacidad ocratox\u00edgena. Se ha estudiado el efecto del sustrato (medios cya y yes), la temperatura (5-45\u00c2\u00bac), la actividad de agua (aw) (0,78-0,99) y el ph (2-10) en el crecimiento y la producci\u00f3n de ota. Asimismo, se ha analizado la relaci\u00f3n filogen\u00e9tica de las cepas estudiadas mediante diferentes t\u00e9cnicas de biolog\u00eda molecular (rflp, rapd, secuenciaci\u00f3n, eric-pcr, aflp y microsat\u00e9lites).     los resultados obtenidos han permitido determinar las condiciones \u00f3ptimas para la producci\u00f3n de ota en las cepas del agregado a.Niger (medio yes a 20-25\u00c2\u00bac en el intervalo 0,96-0,99 aw y ph 5-10) y en las de a.Carbonarius (medio cya a 15-20\u00c2\u00bac en el intervalo 0,98-0,99 aw y ph 5-7). En relaci\u00f3n a la caracterizaci\u00f3n molecular de las cepas estudiadas, las t\u00e9cnicas de rapd y secuenciaci\u00f3n confirman la separaci\u00f3n del agregado a.Niger en dos grupos que se corresponden con los patrones<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Aspergillus secci\u00f3n nigri: estudio fisiol\u00f3gico y molecular de especies ocratox\u00edgenas<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Aspergillus secci\u00f3n nigri: estudio fisiol\u00f3gico y molecular de especies ocratox\u00edgenas <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Alexandre Esteban Franco <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 21\/02\/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>Lourdes Abarca Salat<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: josep Guarro artigas <\/li>\n<li>josep Girbal llado (vocal)<\/li>\n<li>vicente Sanchis almenar (vocal)<\/li>\n<li>francesc Accensi alemany (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Alexandre Esteban Franco La presente memoria de tesis doctoral, presentada en forma de compendio de publicaciones, recoge [&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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