Proton Spectroscopy
Mostrando 25-36 de 327 artigos, teses e dissertações.
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25. Classification of brain tumor extracts by high resolution ¹H MRS using partial least squares discriminant analysis
High resolution proton nuclear magnetic resonance spectroscopy (¹H MRS) can be used to detect biochemical changes in vitro caused by distinct pathologies. It can reveal distinct metabolic profiles of brain tumors although the accurate analysis and classification of different spectra remains a challenge. In this study, the pattern recognition method partial
Braz J Med Biol Res. Publicado em: 2011-02
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26. Desenvolvimento de membranas mistas a base de poli(indeno) sulfonado e PVA reticulado com objetivo de aplicação em célula a combustível tipo PEM
The study on alternative membranes for use in fuel cells PEM (Proton Exchange Membrane) has been conducted by different research groups worldwide. As the commercial membranes still have high cost and performance limitations in certain operating conditions of fuel cells powered by hydrogen and alcohol. This study aimed to evaluate non-fluorinated membranes pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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27. Correlation between hippocampal volumes and proton magnetic resonance spectroscopy of the posterior cingulate gyrus and hippocampi in Alzheimer's disease
Resumo Estudos anteriores demostraram redução do volume hipocampal, redução da concentração de N- Acetilaspartato (NAA) e aumento da concentração de mio-inositol (mI) em pacientes com doença de Alzheimer (DA). O objetivo deste trabalho foi de avaliar os volumes hipocampais de pacientes com DA e correlacioná-los com as alterações metabólicas dete
Dement. neuropsychol.. Publicado em: 2010-06
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28. Análise comparativa entre a dosagem do lactato no líquor e sua detecção atráves da espectroscopia de prótons por ressonância magnética / Comparative analysis between lactate biochemical dosage in cerebrospinal fluid and its detection by proton magnetic resonance spectroscopy
INTRODUCTION: The cerebrospinal fluid (CSF) lactate biochemical dosage is a routine and a requisite procedure to evaluate and to monitor many neurological diseases, such as mitochondrial disease (MD). Patients with MD and central nervous system (CNS) involvement, usually show an increase of CSF lactate. Another choice to study the lactate instead of CSF bioc
Publicado em: 2010
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29. Estudo sobre o hidróxido de potássio no processo de produção industrial de poliol poliéter
Metallic ions may interact with polyether polyols giving macromolecular complexes. From this approach, it was investigated the interaction of cationic potassium with polyether polyols by means of several techniques in order to proof complexation as well as its ocurrence. The industrial synthesis of polyether polyols does not result in a pure product but give
Publicado em: 2010
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30. ESTUDO CONFORMACIONAL E ESPECTROSCÓPICO DO DIPIRIDAMOL: uma visão semiempírica. / CONFORMATIONAL ANALYSIS AND SPECTROSCOPY DIPYRIDAMOLE: a vision semiempirical.
O dipiridamol, 2,6-bis(dietanolamina)-4,8-dipiperidinadinapirimida-[5,4-d] pirimidina (DIP), é utilizado como fármaco clinicamente aprovado para utilização na cardiologia, pertencendo a classe de heterocíclicos que apresentam atividades interessantes tais como antioxidante. Neste trabalho, estudou-se estabilidade relativa entre seis estruturas conformac
Publicado em: 2010
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31. Síntese e caracterizção eletroquímica de membranas híbridas Nafion-SIO2 para a aplicação como eletrólito polimérico em células a combustível tipo PEM / Synthesis and electrochemical characterization of hybrid membrane nafion-SiO2 for application as polymer electrolyte in PEM fuel cell
In this work, the effect of sol-gel synthesis parameters on the preparation and polarization response of Nafion-SiO2 hybrids as electrolytes for proton exchange membrane fuel cells (PEMFC) operating at high temperatures (130 oC) was evaluated. The inorganic phase was incorporated in a Nafion matrix with the following purposes: to improve the Nafion water upt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/11/2009
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32. Estudo do córtex pré-frontal dorsolateral esquerdo de pacientes portadores de transtorno afetivo bipolar em comorbidade com alcoolismo através do uso de espectroscopia por ressonância magnética de hidrogênio / Study of the left dorsolateral prefrontal cortex of bipolar disorder patients with comorbid alcoholism using proton magnetic resonance spectroscopy.
Cerca de 50% dos pacientes portadores de transtorno afetivo bipolar (TAB) apresentam comorbidade com abuso ou dependência de álcool. A presença de alcoolismo nos pacientes com TAB está associada a manifestações clínicas mais graves e a uma pior resposta ao tratamento do transtorno de humor. Entretanto, as anormalidades neurobiológicas subjacentes à
Publicado em: 2009
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33. Estudo do desempenho e degradação de catalisadores e membranas em células a combustível de eletrólito polimérico / A performance and degradation study of catalysts and membranes for proton exchange fuel cell
In this work, the oxygen reduction reaction (ORR) was studied on nano-particulated Pt and PtM (M = Co, Cr, Fe e Ni) alloy electrocatalysts supported on carbon, prepared by an impregnation method, for utilization on polymer electrolyte fuel cell (PEFC). The physical properties of the materials have been investigated by energy dispersive X-ray analyses (EDX),
Publicado em: 2009
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34. Biological sensors based on immune response cells applied to the study of anti-allergic activity of natural compounds. / Utilização de sensores biológicos baseados em células de resposta imune no estudo da atividade antialérgica de substâncias naturais.
Anti-allergic activity of extracts and isolated compounds obtained from natural sources was investigated using the mast-cell based biosensor system. Mast cells release beta-hexosaminidase enzyme which is used as a marker of degranulation. Flavonoids (quercetin-Qc and rutin-Rt) and polyphenolic acids (caffeic acid-Cf and dimethoxy cinnamic acid-Dm) were used
Publicado em: 2009
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35. Sensor de NO2 utilizando-se filmes moleculares de macrociclos de porfirinas
The object of this work is the study, characterization and development of new sensors using the LB and LS of thin films deposition techiniques. Such sensors has been used for the gas sensing of NO2, althought, not discarting its use for detecting other gases or substances such as alchools or herbicides, etc. The materials used for assemble the sensors were t
Publicado em: 2009
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36. Relação entre a Síndrome Metabólica, teor de gordura intramiocelular e os níveis plasmáticos da Adiponectina: papel da Rosiglitazona / Relationship between the Metabolic Syndrome, intramyocellular fat and plasma Adiponectin: role of Rosiglitazone
Insulin resistance (IR) is associated with intramyocellular lipid (IMCL) content and low serum adiponectin (ADP) levels. ADP is also involved in muscle fat oxidation but the relationship between them is still controversial. We aimed to further explore the relationship between ADP and IMCL content in non-diabetic adults and the role of rosiglitazone (RSG) in
Publicado em: 2009