{"id":69287,"date":"2004-10-07T00:00:00","date_gmt":"2004-10-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/distribuciones-de-cobalto-en-aguas-del-atlantico-nororiental-central\/"},"modified":"2004-10-07T00:00:00","modified_gmt":"2004-10-07T00:00:00","slug":"distribuciones-de-cobalto-en-aguas-del-atlantico-nororiental-central","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/palmas-de-gran-canaria\/distribuciones-de-cobalto-en-aguas-del-atlantico-nororiental-central\/","title":{"rendered":"Distribuciones de cobalto en aguas del atl\u00e1ntico nororiental central"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Mart\u00edn Mu\u00f1oz Francisco Jos\u00e9 <\/strong><\/h2>\n<p>La funci\u00f3n enzim\u00e1tica en general y, m\u00e1s en concreto, la necesidad de cobalamina (vitamina b12) hacen del cobalto un metal traza esencial para el 80% de las especies de fitoplancton cuyos requerimientos de b12 han sido estudiados. el cobalto puede encontrarse en aguas oce\u00e1nicas a niveles de ultratraza  (&lt;0,02nm), y puede jugar como elemento biolimitante relacionado con necesidadesmetab\u00f3licas directas o por su papel de sustityuyente metab\u00f3lico del cinc.Las escasas referencias a las distribuciones de cobalto en el medio naturalparten de ladificultad desu determinaci\u00f3n. Las t\u00e9cnicas voltamperom\u00e9tricasadsorptivas en presencia de dioximas y nitrito permiten una doble cat\u00e1lisispor ligando, lo que ha permitido alcanzar la sensibilidad requerida parala determinaci\u00f3n sistem\u00e1tica del cobalto enaguasoce\u00e1nicas.Se ha realizado la adecuaci\u00f3n metodol\u00f3gica necesaria para lograr mejorasen la sensibilidad de la determinaci\u00f3n de cobalto utilizando como ligadola nioxima y barridos de baja velocidad convencionales. Al mismo tiempo,el m\u00e9todopropuestodisminuye errores debido a la naturaleza variable delas muestras oce\u00e1nicas. As\u00ed mismo, se ha estudiado la respuesta del m\u00e9todoen presencia de dimetilglioxima con respecto a los nuevos modelos catal\u00edticosdescritos por bobrowsky y zarebski(2000).Laaplicaci\u00f3n de la t\u00e9cnica de voltoamperometr\u00eda adsortiva de redisoluci\u00f3ncat\u00f3dica (arc-av) con barrido a alta velocidad permite la visualizaci\u00f3nde una doble componente de pico de reducci\u00f3n del complejo nioxima-cobaltodebido a una cat\u00e1lisisdiferenciada delos complejos 1:1 y 1:2 para un\u00fanico estado de oxidaci\u00f3n del metal (co(ii)). La concentraci\u00f3n de nitritoen disoluci\u00f3n influye en mayor grado sobre la sensibilidad del pico dereducci\u00f3n m\u00e1s negativo seg\u00fan el modelo catal\u00edtico del complejo debobrowskyyzaravski (2000). El aumento de la concentraci\u00f3n de co favorece la sensibilidadde esta \u00faltima se\u00f1al, mientras que a altas concentraciones del metal odel<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Distribuciones de cobalto en aguas del atl\u00e1ntico nororiental central<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Distribuciones de cobalto en aguas del atl\u00e1ntico nororiental central <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Mart\u00edn Mu\u00f1oz Francisco Jos\u00e9 <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Palmas de gran canaria<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 10\/07\/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>Francisco Collado S\u00e1nchez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Su\u00e1rez de tangil navarro Miguel a. <\/li>\n<li> Haroun tabraue ricardo Jes\u00fas (vocal)<\/li>\n<li>esther P\u00e9rez martell (vocal)<\/li>\n<li> Rueda l\u00f3pez Mar\u00eda josefa (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Mart\u00edn Mu\u00f1oz Francisco Jos\u00e9 La funci\u00f3n enzim\u00e1tica en general y, m\u00e1s en concreto, la necesidad de cobalamina [&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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