Oxy Reduction
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Addition of CeO2 Nanorods in PtSn-Based Electrocatalysts for Ethanol Electrochemical Oxidation in Acid Medium
This work describes the preparation of Pt/C, PtxSny/C and PtxSny(CeO2 nanorods/C) nanoparticle catalysts synthesized by the chemical reduction method via sodium borohydride for the ethanol oxidation reaction. Using X-ray diffractogram analysis, it was verified that no alloy formation occurred between platinum (Pt) and tin (Sn). The distribution of the nanopa
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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2. Activation of endogenous angiotensin converting enzyme 2 prevents early injuries induced by hyperglycemia in rat retina
Diabetic retinopathy (DR) is a serious complication of diabetes mellitus that may result in blindness. We evaluated the effects of activation of endogenous angiotensin converting enzyme (ACE) 2 on the early stages of DR. Rats were administered an intravenous injection of streptozotocin to induce hyperglycemia. The ACE2 activator 1-[[2-(dimethylamino) ethyl]
Braz J Med Biol Res. Publicado em: 29/09/2015
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3. DETERMINAÇÃO RÁPIDA E AUTOMÁTICA DE AÇÚCARES REDUTORES EM CALDO DE CANA-DE-AÇÚCAR / RAPID DETERMINATION OF REDUCING SUGARS IN, AUTOMATIC AND BROTH OF SUGAR CANE
Os monossacarídeos (glicose e frutose) presentes na cana-de-açúcar são açúcares redutores por possuírem grupo carbonílico livres, capazes de se oxidarem na presença de agentes oxidantes. Os métodos analíticos clássicos (Lane-Eynon, Benedict, complexométrica-EDTA, Luff-Schoorl, Musson-Walker, Somogyi-Nelson) baseiam-se na redução de íons cobre
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/05/2012
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4. Nanostructures oxy-hydroxides of iron (III) stabilized by a polymeric matrix for use in cathodes of biomimetic fuel biocélulas / Nanoestruturas de óxi-hidróxidos de ferro (III) estabilizadas em matriz polimérica para aplicação em cátodos biomiméticos de biocélulas a combustível
Biofuel cells (BFCs) are electrochemical devices that converts a source fuel into an electric current in the presence of biocatalysts. In the case of enzyme BFCs, there are some limitations, such as high control of pH, denaturation of proteins at some conditions, high cost of enzymes, hard ways of bimolecular immobilization, and others. However, the developm
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2011
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5. Especiação, quantificação, distribuição e transporte de mercúrio em solos contaminados do município de Descoberto, Minas Gerais
In 2002, the blooming of metallic mercury in an area of the soil of Descoberto was observed. Municipal and state health representatives, besides research centers, performed several actions to evaluate the situation and guarantee the populations safety. The obtained results for soil superficial layer indicated Hg concentrations above the level in which there
Publicado em: 2010
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6. Catalisadores de Pt suportados, obtidos pelo método solgel : efeito do cério na atividade e estabilidade nas reações de reforma do metano
The effect of Ce as a structural and electronic promoter on the activity and stability of Pt catalysts supported on Al2O3 for methane reforming reactions were investigated to elucidate the metal-support interaction. Pt/Al2O3 and Pt/CeO2-Al2O3 catalysts were prepared by conventional method of wet impregnation on commercial supports and on CeO2- Al2O3 mixed ox
Publicado em: 2009
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7. Interaction of hidrophilic porphyrins and extracellular hemoglobin with biomimetic models of biological membranes / Interação de porfirinas hidrofílicas e de hemoglobina extracelular com modelos biomiméticos de membrana biológica
In the first part of this work interactions of the cationic meso tetrakis (4-N-methilpyridil) porphyrin (TMPyP) and meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS4) in the free base forms with membrane model systems (ionic micelles, mixed micelles and phospholipids vesicles) in aqueous solutions, have been investigated by optical absorption, resonance lig
Publicado em: 2008
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8. Caracterização parcial das reações de fotooxidação e eletrooxidação do dipiridamol e das subunidades de hemoglobina extracelular / Partial caracterization of dipydidamole fotooxidation and eletrooxidation reactions and partial caracterization of extracellular hemoglobin subunits
Dipyridamole (DIP), 2,6-bis(dietanolamina)-4,8-dipiperidinapirimida-[5,4-d] pirimidina) is known for its vasodilating and antiplatelet aggregation activity, exhibiting also a potent antioxidant effect, strongly inhibiting lipid peroxidation. In the present work, the quenching of singlet molecular oxygen, O2(1Δg), by dipyridamole, RA47 and RA25 was anal
Publicado em: 2008
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9. Estudo quimioenzimatico da sintese de um analogo do residuo N-terminal de nikkomicinas
Nikkomycins belong to a group of nucleoside peptides antibiotics produced by streptomycets. These compounds are potent chitin synthetase inhibitors and they exhibit fungicidal, insecticidal, and acaricidal activities. Our approach began with an asymmetric reduction of ethyl benzoylacetate 37. We evaluate the biocatalytic potential of some brazilian microorga
Publicado em: 2003
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10. Regulation of the OxyR transcription factor by hydrogen peroxide and the cellular thiol—disulfide status
The Escherichia coli transcription factor OxyR is activated by the formation of an intramolecular disulfide bond and subsequently is deactivated by enzymatic reduction of the disulfide bond. Here we show that OxyR can be activated by two possible pathways. In mutants defective in the cellular disulfide-reducing systems, OxyR is constitutively activated by a
The National Academy of Sciences.
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11. Mutational analysis of the redox-sensitive transcriptional regulator OxyR: regions important for oxidation and transcriptional activation.
OxyR is a redox-sensitive transcriptional regulator of the LysR family which activates the expression of genes important for the defense against hydrogen peroxide in Escherichia coli and Samonella typhimurium. OxyR is sensitive to oxidation and reduction, and only oxidized OxyR is able to activate transcription of its target genes. Using site-directed mutage
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12. Growth of a Bacterium Under a High-Pressure Oxy-Helium Atmosphere †
Growth of a barotolerant marine organism, EP-4, in a glutamate medium equilibrated with an oxy-helium atmosphere at 500 atmospheres (atm; total pressure) (20°C) was compared with control cultures incubated at hydrostatic pressures of 1 and 500 atm. Relative to the 1-atm control culture, incubation of EP-4 at 500 atm in the absence of an atmosphere resulted