Benzoquinone
Mostrando 1-12 de 132 artigos, teses e dissertações.
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1. EVALUATION OF THE PHOTOCATALYTIC ACTIVITY OF SiO2@TiO2 HYBRID SPHERES IN THE DEGRADATION OF METHYLENE BLUE AND HYDROXYLATION OF BENZENE: KINETIC AND MECHANISTIC STUDY
Abstract Silica spheres coated with titania (SiO2@TiO2) were synthesized using chitosan as template. The N2 adsorption/desorption isotherms of the spheres point to meso and macroporous characteristics and the elemental mapping by EDS shows uniform distribution of Ti on the surface of the silica spheres, leading to formation of an amorphous structure (XRD). T
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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2. Use of Idebenone for the Treatment of Leber’s Hereditary Optic Neuropathy
Abstract Leber’s hereditary optic neuropathy (LHON) is one of the most frequent mitochondrial disorders. It is caused by mutations in genes of the mitochondrial DNA coding for subunits of the respiratory chain and leads to severe bilateral vision loss, from which spontaneous recovery is infrequent. Retinal ganglion cells show a selective vulnerability to m
J. inborn errors metab. screen.. Publicado em: 16/05/2019
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3. Fontes, formação, reatividade e determinação de quinonas na atmosfera
Quinones are a group of semi-volatile organic substances, ubiquitous in nature, belonging to the class of oxygenated polycyclic aromatic hydrocarbons (Oxygenated PAH). These compounds are formed in biogenic processes, through the oxidative metabolism of endogenous compounds, such as catecholamines, estrogen hormones and xenobiotics, as well as directly emitt
Quím. Nova. Publicado em: 2016-05
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4. SIMPLE AND SELECTIVE SPECTROPHOTOMETRIC ASSAY OF DIETHYLCARBAMAZINE CITRATE USING 2,3-DICHLORO-5,6-DICYANO-
p -BENZOQUINONE AND 2,4-DINITRO PHENOLTwo simple, rapid and inexpensive spectrophotometric methods are described for the determination of diethylcarbamazine citrate (DEC) in bulk drug and formulations. The methods are based on the charge–transfer (CT) complexation reaction involving DEC as the n- donor and 2,3-dichloro-5,6-dicyano-
p -benzoquinone [DDQ] (method A) and 2,4-dinQuím. Nova. Publicado em: 2015-06
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5. An interleukin-33/ST2 signaling deficiency reduces overt pain-like behaviors in mice
Interleukin (IL)-33, the most recent member of the IL family of cytokines, signals through the ST2 receptor. IL-33/ST2 signaling mediates antigen challenge-induced mechanical hyperalgesia in the joints and cutaneous tissues of immunized mice. The present study asked whether IL-33/ST2 signaling is relevant to overt pain-like behaviors in mice. Acetic acid and
Braz J Med Biol Res. Publicado em: 16/07/2013
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6. A regioquímica das reações de Diels-Alder de N-tosil para-benzoquinona iminas / The regiochemistry of the diels-alder reaction of n-tosyl para-benzoquinone imines
Neste trabalho foi realizado um estudo comparativo da reatividade de diferentes dienófilos: para-benzoquinonas, suas mono-oximas, suas mono-oximas tosiladas e as suas N-tosiliminas frente às reações de Diels-Alder com dienos simples. A síntese destes dienófilos foi realizada através de algumas modificações químicas a partir dos fenóis corresponden
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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7. Photocatalytic degradation of 1,4-benzoquinone in aqueous ZnO dispersions
O presente artigo relata a degradação UV-assistida de 1,4-benzoquinona em suspensões ZnO. As variáveis estudadas incluem a concentração de 1,4-benzoquinona, fotocatalisador, pH e carbono orgânico total. A concentração de 1,4-benzoquinona e o carbono orgânico residual foram medidos usando espectrofotômetro UV-Visível e analisador TOC, respectivame
Journal of the Brazilian Chemical Society. Publicado em: 2012-02
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8. Ácido myrsinoico a e derivado: inibidores da fotossíntese in vitro
Myrsinoic A acid, isolated from Myrsine cuneifolia and its hydrogenated derivative had their effect on photosynthesis tested. The compounds inhibited the electron flow (basal, phosphorylating and uncoupled) from water to methylviologen; therefore, they act as Hill reaction inhibitors in spinach thylakoids. They inhibited partial reactions of PSII electron fl
Química Nova. Publicado em: 2012
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9. Recent advances in 1,4-benzoquinone chemistry
As 1,4-benzoquinonas são encontradas em toda a natureza, podendo ser sintetizadas por diversas estratégias. Esta revisão apresenta os desenvolvimentos recentes das metodologias de síntese, das reações de ciclo adição, da química computacional e dos estudos de pulso radiolítico. Destaca ainda a sua significância química e biológica e de seus comp
Journal of the Brazilian Chemical Society. Publicado em: 2011-03
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10. Avaliação eletroquímica do desempenho de células termogalvânicas empregando líquidos iônicos como meio eletrolítico e alumínio como eletrodos
Thermogalvanic cells are thermoconverter electrochemical devices where two electrodes, not necessarily chemically identical or reversible, are held at different temperatures. The temperature difference between the electrodes creates a potential difference that can be used to drive current to an external circuit. Thus, direct conversion from thermal energy to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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11. Anticonvulsant activity of thymoquinone and its structural analogues
It has been widely reported that the crude oil of Nigella sativa L., Ranunculaceae, seeds and its major chemical component thymoquinone present anticonvulsant activity. These facts led us to verify the pharmacological potential of five structurally related para-benzoquinones on the pentylenotetrazol-induced seizures model, and establish the structural charac
Revista Brasileira de Farmacognosia. Publicado em: 18/03/2010
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12. The syntheses of the marine metabolites 3-bromoverongiaquinol and 5-monobromocavernicolin
An efficient synthesis of the marine metabolite 3-bromoverongiaquinol (1) and the first total synthesis of 5-monobromocavernicolin (2), both isolated from the marine sponge Aplysina cavernicola, have been described based on the 1,2 addition of the lithium enolate of N,O-bistrimethylsilylacetamide (BSA, 4) to 1,4-benzoquinone (3). Bromination and purification
Química Nova. Publicado em: 2010