{"id":87801,"date":"2000-11-12T00:00:00","date_gmt":"2000-11-12T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/la-alteracion-cromatica-en-piedra-arenisca\/"},"modified":"2000-11-12T00:00:00","modified_gmt":"2000-11-12T00:00:00","slug":"la-alteracion-cromatica-en-piedra-arenisca","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/la-alteracion-cromatica-en-piedra-arenisca\/","title":{"rendered":"La alteracion cromatica en piedra arenisca"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Valero Congil Jes\u00fas Manuel <\/strong><\/h2>\n<p>En el presente trabajo se ha determinado la contribucion de la actividad microbiana a la genesis y caracteristicas de las costras negras en piedra arenisca, y especialmente a la alteracion cromatica en dichas costras. en la primera parte del trabajo, la investigacion fue enfocada a la caracterizacion de las costras negras en la piedra arenisca. Esta caracterizacion, que contempla aspectos quimicos y microbiologicos, tenia como objetivos determinar la composicion de las costras negras y evaluar la presencia y actividad microbiana en dichas costras, para establecer en que procesos (formacion de sales, alteracion cromatica) podian estar involucrados los microorganismos. en una segunda fase, el objetivo ha sido determinar la importancia de los hongos negros en las costras, su capacidad productora de melanina y las caracteristicas de dicha melanina, para lo que se ha estudiado la melanina generada. En la tercera parte del trabajo, el objetivo ha sido estudiar la influencia de los hongos negros en la genesis de la alteracion cromatica en costras negras, analizando el papel de las melaninas en la genesis de la alteracion cromatica, e investigando la relacion entre contaminantes atmosfericos y hongos negros. Se ha demostrado que los hongos negros son los causantes del oscurecimiento observable en las costas negras, debido a la produccion de melanina.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>La alteracion cromatica en piedra arenisca<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 La alteracion cromatica en piedra arenisca <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Valero Congil Jes\u00fas Manuel <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Pa\u00eds vasco\/euskal herriko unibertsitatea<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 11\/12\/2000<\/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>Jos\u00e9 I\u00f1aki Alava Marquinez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jes\u00fas Mar\u00eda Aizpurua iparraguirre <\/li>\n<li>marius Vendrell saz (vocal)<\/li>\n<li>Jos\u00e9 Delgado rodrigues (vocal)<\/li>\n<li> Galaz garcia Ana Mar\u00eda (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Valero Congil Jes\u00fas Manuel En el presente trabajo se ha determinado la contribucion de la actividad microbiana [&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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