Global ETD Search

1	The international biotrade, conservation and intellectual property rights Dutfield, Graham January 2001 (has links) No description available. 382 Global trade; Biogenetic resources
2	Studies directed towards the synthesis of secu'amamine A Padilla Acevedo, Angela Isabel 21 February 2014 (has links) Herein is described our synthetic studies towards the synthesis of secu'amamine A, a member of the Securinega alkaloids. The first chapter describes the isolation, biological significance and previous synthesis of secu'amamine A. Chapter 2 discusses our proposed biogenetic origin of secu'amamine A from allosecurinine and the model studies to support the intermediacy of the putative aziridinium ion. Chapter 3 discusses our synthetic approach to the formation of rings A and C, as well as investigations on the regioselective functionalization of 1,2-dihydropyridines. Chapter 4 discusses the synthesis of ring D from ring D' and the transformations of our advanced intermediates with different carbamate protective groups. Chapter 5 consists of experimental details and characterization data for all new compounds. / text Secu'amamine A Securinega Alkaloids Secu'amamine Securinine Allosecurinine Aziridinium ion Aziridinium intermediate 1,2-dihydropyridine Biogenetic origin
3	Biosynthesis of Lycopodine Castillo, Mariano 10 1900 (has links) <p> The biosynthesis of lycopodine was studied by feeding radioactive acetate, acetoacetato, lysine and pelletierine to Lycopodium tristachyum. Partial degration of the radioactive lycopodine recovered from these experiments revealed specific incorporation of these precursors. The labeling pattern obtained is discussed in the light of the two major blogenetic hypothesis advanced for the Lycopodium alkaloids. </p> <p> The results obtained disproved Conroy's polyacetate hypothesis. They are consistent with the hypothesis that regards these alkaloids derived from lysine and acetate. </p> / Thesis / Doctor of Philosophy (PhD)
4	A teoria da gastrea de Ernst Haeckel / The gastrea theory of Ernst Haeckel Santos, Guilherme Francisco 07 October 2011 (has links) O objetivo principal de nosso trabalho é descrever e analisar criticamente o núcleo da teoria da gastrea de Ernst Haeckel. Ele gira em torno de duas noções principais: forma gastrular e metazoário. A teoria da gastrea é um conjunto de formulações que visa estabelecer uma definição de metazoário a partir da noção de forma gastrular. O argumento central da teoria da gastrea articula essas duas noções para organizar a partir de estudos de embriologia comparativa uma visão geral da história evolutiva do reino animal. / The main goal of our work is to describe and critically analyze the core of the gastrea theory of Ernst Haeckel. It centers around two main notions: gastrula form and metazoan. The gastrea theory is a set of formulations designed to establish a definition of metazoan from the notion of gastrula form. The central argument of the gastrea theory articulates these two notions to organize from studies of comparative embryology an overview of evolutionary history of the animal kingdom. Ernst Haeckel Ernst Haeckel filosofia da biologia Fritz Müller Fritz Müller fundamental biogenetic law Gastrea theory história da biologia do século XIX história da embriologia history of embryology history of nineteenth-century biology lei biogenética fundamental metazoan metazoário morfologia morphology philosophy of biology Teoria da gastrea
5	A teoria da gastrea de Ernst Haeckel / The gastrea theory of Ernst Haeckel Guilherme Francisco Santos 07 October 2011 (has links) O objetivo principal de nosso trabalho é descrever e analisar criticamente o núcleo da teoria da gastrea de Ernst Haeckel. Ele gira em torno de duas noções principais: forma gastrular e metazoário. A teoria da gastrea é um conjunto de formulações que visa estabelecer uma definição de metazoário a partir da noção de forma gastrular. O argumento central da teoria da gastrea articula essas duas noções para organizar a partir de estudos de embriologia comparativa uma visão geral da história evolutiva do reino animal. / The main goal of our work is to describe and critically analyze the core of the gastrea theory of Ernst Haeckel. It centers around two main notions: gastrula form and metazoan. The gastrea theory is a set of formulations designed to establish a definition of metazoan from the notion of gastrula form. The central argument of the gastrea theory articulates these two notions to organize from studies of comparative embryology an overview of evolutionary history of the animal kingdom. Ernst Haeckel filosofia da biologia Fritz Müller história da biologia do século XIX história da embriologia lei biogenética fundamental metazoário morfologia Teoria da gastrea Ernst Haeckel Fritz Müller fundamental biogenetic law Gastrea theory history of embryology history of nineteenth-century biology metazoan morphology philosophy of biology

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