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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Ontogênese das estruturas axilares em Anacampserotaceae (Caryophyllales) / Ontogenesis of the axillar structures in Anacampserotaceae (Caryophyllales)

Ligia Keiko dos Santos 17 November 2015 (has links)
Anacampserotaceae pertence à ordem Caryophyllales, subordem Portulacineae, atualmente constituída por três gêneros (Anacampseros L., Grahamia Gill ex Hook e Talinopsis A. Gray) antes pertencentes à família Portulacaceae. Os representantes de Anacampserotaceae apresentam estruturas axilares lignificadas muito características, como tricomas, escamas (scales) e cerdas (bristles) e também apresentam células do tipo WBT que ocorre somente em mais outras duas famílias de Caryophyllales, Aizoaceae e Cactaceae. Os caracteres axilares são muito informativos para o clado ACPT (Anacampserotaceae, Cactaceae, Portulacaceae e Talinaceae) e vêm revelando importantes dados aos estudos filogenéticos da subordem Portulacineae, no entanto, há uma controvérsia quanto a origem ontogenética das estruturas axilares de Anacampserotaceae, o que pode levar a interpretações equivocadas das relações filogenéticas do grupo. Diante disso, este trabalho realizou um estudo ontogenético das estruturas presentes na região da axila foliar de oito espécies de Anacampserotaceae e analisou as WBTs do caule e de folhas quanto seu tipo de espessamento e medidas quantitativas de seis espécies. Os resultados apontam a 1) origem estipular das escamas e não protodérmica, como mencionado na literatura; 2) primeiro relato de profilos na família e 3) WBTs ocorrem em Anacampseros e estão ausente em Talinopsis, grupo considerado basal na família. / Anacampserotaceae belongs to the order Caryophyllales, suborder Portulacineae, currently consists of three genus (Anacampseros L., Grahamia Gill ex Hook and Talinopsis A. Gray) formerly circumscribed to the family Portulacaceae. Anacampserotaceae\'s representative presents lignified axillary structures very distinctive, like trichomes, scales and bristles and also WBT cells that is presented only by two other families of Caryophyllales, Aizoaceae e Cactaceae. The axillary characters are very informative for the ACPT clade (Anacampserotaceae, Cactaceae, Portulacaceae and Talinaceae) and has been revealing important data for the phylogenetic studies on the Portulacineae suborder, nevertheless, there is a controversy regarding the Anacampserotaceae axillary structures ontogenetic origin, what may lead to misguided interpretations for the ACPT phylogenetic relationships. Before it, this research have accomplished the ontogenetic study of the structures present on the leaf axil of eight Anacampserotaceae species and examined stem and leaf WBTs, as for its secondary thickening type and quantitative measurements of six species. The results points 1) that at least one structure (scale) has leaf origin instead of protodermic origin, as stated by some authors; 2) first report of prophylls for the family and 3) WBTs occur in Anacampseros but they are absent in Talinopsis, a basal group of Anacampserotaceae.
12

B + B BARCELONA / B + B BARCELONA

Fabián, Ondřej January 2010 (has links)
The proposal for place like the district of Poblenou is a great adventure. The blocks of the famous urban Plan Cerda closest inside in itself dramatic history of old industrial era, when they have called Barcelona " The Manchester Of Catalunya ". And here I ask myself the question. What does the word landscape in this environment? How to apply to old buildings and chimneys of the idea of the archetype of landscape? Is it just those elements that had nurtured almost all Catalunya? They can be roof now abandoned industrial buildings become something else? The new facade?A Sea? A Landscape ?
13

Chile 1974-1977 : sujetos testimoniales bajo el poder dictatorial y la tortura

Ahumada Sáez, Claudio January 2010 (has links)
La siguiente investigación se enmarca en el análisis de tres relatos testimoniales que textualizan una parte de la dictadura militar chilena implantada el 11 de septiembre de 1973. El período abordado comprende los años 1974 hasta 1977, fechas que indican sus publicaciones fuera de Chile. Los textos, que componen el corpus de análisis son: Tejas verdes. Diario de un campo de concentración en Chile, de Hernán Valdés; Relato en el frente chileno, de Michel Bonnefoy y Cérco de puás, de Aníbal Quijada.
14

Estudio de la expresión génica y de la composición proteica del oviducto. Efectos del fluido oviductal sobre la resistencia de la zona pelúcida a la digestión enzimática en diferentes mamíferos.

Mondéjar Corbalán, Irene 01 November 2011 (has links)
La fecundación en mamíferos consiste básicamente en la fusión de los gametos masculino y femenino para formar un zigoto capaz de dar lugar a un nuevo individuo. Hasta ahora, la mayoría de las investigaciones encaminadas al esclarecimiento de este proceso se han centrado en el estudio de la biología de ambos gametos como células aisladas, o bien en el estudio de los diversos mecanismos que tienen lugar durante la interacción de ambos. Sin embargo, se ha dejado un poco de lado a otro elemento fundamental y sin el cual el resto de estudios pueden resultar incompletos: el microambiente en el que tiene lugar el encuentro entre los gametos, es decir, el fluido y las células oviductales que secretan ciertos componentes de dicho fluido. La fase folicular tardía o etapa inmediatamente preovulatoria, es el momento en el que el oviducto se encuentra preparado para el encuentro de los gametos y para que se produzca la fecundación. Debido a la importancia de los factor es implicados en la unión de gametos que han de estar presentes en este momento preciso del ciclo estral y a la escasez de información acerca de los mismos, centramos nuestro estudio en esta fase. Para ello, se abordó el análisis de los componentes oviductales y sus características fundamentalmente desde cuatro perspectivas: (1) efecto del fluido oviductal (FO) sobre la resistencia a la digestión enzimática de la zona pelúcida en 9 especies, (2) fraccionamiento del FO bovino en base a su capacidad de unión a heparina, (3) análisis proteómico del FO y (4) análisis de la expresión génica del oviducto porcino. / Fertilization in mammals is basically the merging of male and female gametes to form a zygote that can give rise to a new individual. So far, most research aimed at clarifying this process have focused either on the study of the biology of the spermatozoon and the oocyte as isolated cells or in the study of the various mechanisms that occur during the interaction of both. However, it has been partially left to one side to another key element without which the other studies may be incomplete: the microenvironment in which the meeting takes place between the gametes, ie the fluid and the oviductal cells that secrete some components of such a fluid. The late follicular phase or immediately pre-ovulatory phase is the time when the oviduct is prepared for the meeting of gametes and fertilization occurs. Due to the importance of the factors involved in the gametes interaction which must be present at this precise moment of the estrous cycle and the scarcity of information about them, we focused our study on this phase. To do so, it was addressed the analysis of oviductal components and features mainly from four perspectives: (1) effect of oviductal fluid (OF) on the resistance to enzymatic digestion of the zona pellucida in 9 species, (2) fractionation of the bovine oviductal fluid based on their ability to bind to heparin, (3) proteomic analysis of OF and (4) gene expression analysis of pig oviduct.

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