Nuclear Magnetic Ressonance
Mostrando 13-24 de 35 artigos, teses e dissertações.
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13. INFLUENCE OF SYNTHESIS PARAMETERS IN THE PROPERTIES OF MCM-22 ZEOLITE / INFLUÊNCIA DOS PARÂMETROS DE SÍNTESE NAS PROPRIEDADES DA ZEÓLITA MCM-22
MCM-22 zeolite was first synthesized by Mobil researchers in 1990. It is an aluminosilicate with molecular sieve characteristics and several applications in catalytic processes because of its two independent pore systems. In this work, the MCM-22 zeolite synthesis conditions were studied using both static as stirred hydrothermal treatment. Molar composition
Publicado em: 2008
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14. Influência do modo de ativação e de uma restauração simulada de porcelana no grau de conversão e na dureza superficial de um cimento resinoso auto-adesivo de cura dual / Influence of polymerization mode and a simulated ceramic restoration on degree of conversion and surface hardness of a dual-cured self-adhesive resin cement
The aim of this study was to evaluate the degree of conversion (DC) and the microhardness of a self-adhesive resin cement under different activation protocols, immediately and after 24 hours of the beginning of the polymerization, and, defining cement regarding monomer composition, average diameter of the inorganic fillers and the percentage by weight of the
Publicado em: 2008
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15. Ditiocarbamatos derivados do glicoluril, ácido úrico, ácido parabânico e hidantoína: compostos de coordenação e uso como inibidores de corrosão do bronze
This thesis work is about dithiocarbamates compounds, their synthesis, study and application as corrosion inhibitors. The dithiocarbamates herein studied were synthesized from four substances: glycoluril, uric acid, parabanic acid and hydantoin. The pro-ligands were synthesized through reaction with CS2 and NaOH, characterized via elemental analysis (CHN) an
Publicado em: 2008
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16. Aplicações das Tecnicas de Espectrometria de Massas e Ressonancia Magnetica Nuclear na Detecção e Caracterização de Intermediarios Chave de Reações Organicas / Application of mass spectrometry and nuclear magnetic ressonance for the detection and characterization of key intermediates in organic reactions
Esta dissertação de mestrado e dividida em duas partes. A primeira parte, visa, através da técnica de RMN, detectar e estudar a reatividade dos íons N-acilimínios endo- e exocíclicos de 5 e 6 membros, com a finalidade de verificar se o tamanho do anel, a presença de anel aromático e se a diferença entre o grupo acila endo- ou exocíclicos afetam a
Publicado em: 2007
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17. Preparação de resinas de poliuretana à base de óleo de mamona e dietanolamina
The aim of this work was the preparation of polyols from reactions between castor oil and dietanolamine to increase the hydroxyl content and the network degree in the products to application in electronic devices. The polyols and the mixtures obtained were characterized by nuclear magnetic ressonance. Castor oil (CO) is a natural triglyceride - based polyol
Publicado em: 2007
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18. Perfil cromatográfico dos extratos brutos das sementes de Annona muricata L. e Annona squamosa L. através da cromatografia líquida de alta eficiência. / Chromatography profile of crude extract from seeds of Annona muricata L. and Annona squamosa L. by high performance liquid Chromatography.
Phytochemical studies performed previously under laboratory conditions using the species Annona muricata resulted in the extracion of a mixture of acetogenins, which is a class of substances very difficult to separate, despite its large spectra of biological activities. The insectidal properties of this class of compounds which is exclusive of the Annonaceae
Publicado em: 2007
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19. SÃntese e caracterizaÃÃo de surfactantes glicosÃdicos a partir da amilose e alquil fenÃis extraÃdos do LCC. / Synthesis and characterization of glycosidic surfactantes from amylose and alkyl extracted phenols of the LCC.
Nonionic surfactants are synthesised from renewable raw materials such as fat acids and sugars. They are dermatological safe, biodegradable and provide excellent surface active properties, such as good wettability, good foaming production and good cleaning ability. The present work deals with the synthesis and characterization of alkyl polyglycosides where t
Publicado em: 2007
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20. Strutural characterization of hypothetical proteins complex - XACb0032/XACb0033 from Xanthomonas axonopodis pv. citri / Caracterização estrutural do complexo de proteinas hipoteticas - XACb0032/XACb0033 da bacteria Xanthomonas axonopodis pv. citri
Xanthomonas axonopodis pv. citri (Xac) is the causative agent of citrus canker, a disease of significant economic importance worldwide. The molecular bases of the virulence mechanism are still unknown, but is believed that transfer of bacterial virulence proteins directly into the host cell cytoplasm is mediated by protein secretion systems, mainly type III
Publicado em: 2007
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21. SYNTHESIS AND CHARACTERIZATION OF MAGNETIC COBALT FERRITE NANOPARTICLES COVERED WITH 3-AMINEPROPYLTRIETHOXYSILANE FOR USE AS HYBRID MATERIAL IN NANOTECHNOLOGY / "Síntese e caracterização de nanopartículas magnéticas de ferrita de cobalto recobertas por 3-aminopropiltrietoxissilano para uso como material híbrido em nanotecnologia"
Nowadays with the appear of nanoscience and nanotechnology, magnetic nanoparticles have been finding a variety of applications in the fields of biomedicine, diagnosis, molecular biology, biochemistry, catalysis, etc. The magnetic functionalized nanoparticles are constituted of a magnetic nucleus, involved by a polymeric layer with active sites, which ones co
Publicado em: 2006
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22. Recent NMR techniques applied to protein-ligand interactions and metabonomics / Tecnicas de RMN recentes aplicadas as interações proteina-ligante e a metabonomica
Durante as últimas décadas, muitos métodos de RMN de H foram desenvolvidos e aplicados para triagem e caracterização de interações intermoleculares e para a metabonômica. Estes são temas recentes da RMN e ambos serão abordados em dois capítulos distintos neste trabalho. No Capítulo 1 foi realizada a implantação e otimização de técnicas de RM
Publicado em: 2006
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23. Análise química e biológica dos alcalóides de aspidosperma ramiflorum Muell. Arg. e de aspidosperma tomentosum Mart / Chemical and biological analisys of the alkaloids from aspidosperma ramiflorum Muell. Arg and aspidosperma tomentosum Mart
Even before the advent of writing, man already searched the nature for the cure of his illnesses. Among the different classes of natural products used for this purpose, monoterpenoid indole alkaloids exhibit large structural and pharmacological diversities and these compounds are commonly found in the Aspidosperma genus. In this context, the present work had
Publicado em: 2006
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24. Levana Ferromagnetizada: uma matriz de afinidade para purificar lectina de sementes de Cratylia mollis (Cramoll 1)
Levans, fructose polymer, are composed by β-2,6 linkages and can be produced by differents species of plants and bacteria . Applications for levans have been suggested in food industries, pharmaceutics, also in medicine. Ferromagnetic particle in biomedical and industrial areas have been used. Lectins find are ubiquitously distributed in nature, and occ
Publicado em: 2006