Pyrrole
Mostrando 13-24 de 123 artigos, teses e dissertações.
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13. Selective detection of fluoride based on a pyridinium n-phenolate-calix[4]pyrrole displacement assay: an undergraduate laboratory experiment
A two-step experiment is proposed for a third year class in experimental organic chemistry. Over a period of five weeks, the students synthesized calix[4]pyrrole, a receptor that is highly selective for fluoride, and a pyridinium N-phenolate dye. Subsequently, the students used the synthesized compounds to investigate a displacement assay on the basis of the
Quím. Nova. Publicado em: 2014
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14. Basic properties of potassium oxide supported on zeolite y studied by pyrrole-tpd and catalytic conversion of methylbutynol
ABSTRACT We report on the basic properties of zeolite NaY and potassium supported on NaY (K/NaY) assessed by pyrrole-TPD and MBOH transformation. Pyrrole-TPD revealed that impregnation of zeolite NaY with potassium promoted additional adsorption sites for pyrrole compared to parent zeolite. For zeolite with various potassium loadings, pyrrole adsorbed on K/N
Quím. Nova. Publicado em: 2012
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15. Nível de expressão tumoral da indoleamine 2,3-dioxigenase (IDO) como marcador biológico e preditor de metástase em pacientes com tumor carcinoide típico broncopulmonar / Tumor Expression Level of Indoleamine 2,3 dioxygenase as Biological Marker and Metastasis Predictor in Patients with Typical Bronchopulmonary Carcinoid Tumors
Os tumores carcinoides típicos broncopulmonares (TCTB) são considerados neoplasias bem diferenciadas e as menos agressivas dentro do espectro dos tumores neuroendócrinos. Entretanto, metástases linfonodais e hematogênicas tem sido encontradas em número considerável de casos e não existem, até o momento, estudos relacionados aos mecanismos de escape
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/12/2011
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16. Uso de perfis cromatográficos de voláteis de cafés arábicas torrados para a diferenciação das amostras segundo o sabor, o aroma e a qualidade global da bebida
In this work, the volatile chromatographic profiles of roasted Arabica coffees, previously analyzed for their sensorial attributes, were explored by principal component analysis. The volatile extraction technique used was the solid phase microextraction. The correlation optimized warping algorithm was used to align the gas chromatographic profiles. Fifty fou
Química Nova. Publicado em: 2010
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17. Inhibition of Trypanosoma cruzi proline racemase affects host-parasite interactions and the outcome of in vitro infection
Proline racemase is an important enzyme of Trypanosoma cruzi and has been shown to be an effective mitogen for B cells, thus contributing to the parasite's immune evasion and persistence in the human host. Recombinant epimastigote parasites overexpressing TcPRAC genes coding for proline racemase present an augmented ability to differentiate into metacyclic i
Memórias do Instituto Oswaldo Cruz. Publicado em: 2009-12
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18. Design, synthesis and evaluation of biological derivatives pyrroles potentially antiinflamatory activity / Planejamento, síntese e avaliação biológica de derivados pirrólicos com potencial atividade antiinflamatória
The nonsteroidal antiinflammatory drugs (NSAIDs) are among the most prescribed and used drugs in the world. These drugs inhibit the cyclooxygenases, enzymes responsible for conversion of arachidonic acid into phlogistic prostaglandins, by the action of phospholipase A2. The synthesis of compounds containing pyrrole nucleus in their structures has been a topi
Publicado em: 2009
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19. Electrodeposition of polypyrrole films on aluminum surfaces from a p-toluene sulfonic acid medium
Electrodeposition of polypyrrole films on aluminum from aqueous solutions containing p-toluene sulfonic acid and pyrrole was performed by cyclic voltammetry and galvanostatic technique. The influence of applied current density on the morphology of the films was studied by Scanning Electron Microscopy. The films displayed a cauliflower-like structure consisti
Materials Research. Publicado em: 2009
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20. Sintese e caracterização da nova porfirina, meso-tetrakis (4-butoxi-3-metoxifenil) porfirina, e seus derivados metalados
There has been substantial interest in the properties of substituted meso-tetraarylporphyrins and metallo porphyrins as catalysts for oxidation of hydrocarbons and oxygen detection, among others. This work describes the synthesis of a new porphyrin, TBMPP 27, and its metallo complexes 28 and 29. Herein it was used a readily available reactant as starting mat
Publicado em: 2008
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21. Stawamycin : synthetic studies / Estavamicina : estudos sinteticos
Em 1995 Miao e colaboradores relataram o isolamento da estavamicina (1), um novo produto natural, membro da família dos pirrolocetoindanos, a partir de uma cultura líquida de Streptomyses sp., isolada de uma amostra de terra coletada na Índia. A estavamicina contém uma interessante subestrutura hexahidroindeno de fusão de anel trans com 5 centros estere
Publicado em: 2008
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22. Polyphosphate hybrid materials: photochemistry, (di)electric characterization and its application in electrochemical capacitors / Materiais hÃbridos de polifosfatos: fotoquÃmica, caracterizaÃÃo (di)elÃtrica e sua utilizaÃÃo em capacitores eletroquÃmicos
The synergy between the properties of two substances, an organic and another inorganic, can be obtained in a single material by the sol-gel process. The low temperature processing allow the incorporation of organic substances in inorganic matrices. These hybrid materials can have covalent interactions between host and guest (C1), or weak interactions, like v
Publicado em: 2008
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23. Developmento of polypyrrole SPME extraction phase and evaluation of the SPME/LC and SBSE/LC techniques to antidepressants plasma samples analyses / Desenvolvimento da fase extratora SPME de poli(pirrol) e avaliação das técnicas SPME/LC e SBSE/LC para análises de antidepressivos em amostras de plasma
A depressão em idosos é uma desordem persistente e recorrente, resultado do stress psicossocial ou efeito de doenças fisiológicas, que podem acarretar a desabilidade do indivíduo, aumento dos sintomas das doenças clínicas, na maior utilização dos serviços de saúde e altas taxas de suicídios.A monitorização terapêutica permite a ndividualizaç�
Publicado em: 2008
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24. Estudo de um sensor cromogênico aniônico fundamentado na competição entre uma merocianina e um ânion pelo calix[4]pirrol
This work has studied the assembly of a chromogenic sensor that uses as receptor calyx[4]pyrrole (CP), which is capable to recognize fluoride with high efficience, and two solvatochromic dyes, Brookers merocyanine (MB) and Reichardts dye (CR), as signalizing unity. The solutions of MB in acetonitrile, a low polarity medium, exhibit violet color. It was obser
Publicado em: 2007