Chemical Activator
Mostrando 1-12 de 82 artigos, teses e dissertações.
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1. The effects of thymoquinone on pancreatic cancer and immune cells
SUMMARY OBJECTIVES: Black cumin is widely used as a spice and as a traditional treatment. The active ingredient in black cumin seeds is thymoquinone. Thymoquinone has shown anticancer effects in some cancers. We planned to investigate its anticancer effect on pancreatic cancer cell lines. METHODS: Thymoquinone chemical component in various doses was prepar
Revista da Associação Médica Brasileira. Publicado em: 2022
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2. Effect of Curing Temperature, Activator Solution Composition and Particle Size in Brazilian Fly-Ash Based Geopolymer Production
The geopolymer binder is a relatively new class of inorganic binding material of elevated mechanical strength and good chemical properties. This can be produced using clay minerals or byproducts of the industrial processes, such as metakaolin, fly-ash and blast furnace slag. In this work, geopolymers were produced by alkaline activation of a Brazilian fly-as
Mat. Res.. Publicado em: 22/08/2019
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3. Role of Glutaraldehyde in Imparting Stability to Immobilized β-Galactosidase Systems
ABSTRACT This review article highlights the role of glutaraldehyde as a matrix activator/stabilizer in imparting higher operational and thermal stability to β-galactosidase (βG) for biotechnological applications. Glutaraldehyde has been used extensively as a crosslinking agent as well as for functionalization of matrices to immobilize β-galactosidase. Imm
Braz. arch. biol. technol.. Publicado em: 08/01/2018
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4. DESEMPENHO DO CIMENTO PORTLAND BRANCO COM ESCÓRIA DE ALTO-FORNO E ATIVADOR QUÍMICO FRENTE AO ATAQUE POR SULFATO DE SÓDIO / PERFORMANCE OF A WHITE PORTLAND CEMENT WITH SLAG AND CHEMICAL ACTIVATOR AGAINST SODIUM SULFATE ATTACK
Os íons sulfato, encontrados na água do mar, em águas subterrâneas e em águas residuárias são agentes agressivos que podem levar a uma severa degradação do concreto. Ao reagirem com os produtos de hidratação do cimento, dependendo do tipo de cátion a que estão associados (magnésio, cálcio, potássio, sódio, amônio, etc.), da concentração e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2011
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5. Comparison of the erosive potential of two acidic sources in enamel and evaluation of treatments for prevention of dental erosion / Comparação do potencial erosivo de duas fontes ácidas sobre o esmalte e avaliação de métodos de controle da erosão dental
Dental erosion is defined as irreversible loss of dental hard tissue due to chemical processes without the involvement of microorganisms. The aim of this study was to compare in vitro the erosive potential of two acidic sources and evaluate the effectiveness of treatments for prevention of dental erosion. To compare the acidic sources, crowns of 5 unerupted
Publicado em: 2009
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6. CARBONATION AND CAPILLARY ABSORPTION IN CONCRETES OF WHITE PORTLAND CEMENT WITH HIGH CONTENTS OF BLAST FURNACE SLAG AND CHEMICAL ACTIVATORS / CARBONATAÇÃO E ABSORÇÃO CAPILAR EM CONCRETOS DE CIMENTO PORTLAND BRANCO COM ALTOS TEORES DE ADIÇÃO DE ESCÓRIA DE ALTO FORNO E ATIVADOR QUÍMICO
The carbonation phenomenon, reaction between CO2 from the atmosphere in the presence of humidity with the Portland cement hydration products, induces pH reduction to levels that can cause the elimination of steels protective layer, enabling the corrosion mechanism of the steel structure to start.. This is one of the main pathologies in the reinforced concret
Publicado em: 2008
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7. Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente / Chloride ion penetration in concretes with white Portland cement and blast furnace slag, chemically activated
The consumption of white Portland cement (WPC), in structural concretes, has been growing lately. Thus, targeting diffuse its use, and confirm its quality and durability as structural cement, this work has the aimed to investigate the effect of concretes compounds with WPC, slag and chemical activator (Na2SO4), on its behavior against chloride ion penetratio
Publicado em: 2008
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8. ELECTRICAL RESISTIVITY IN CONCRETE WITH DIFFERENT CONCENTRATIONS OF BLAST FURNACE SLAG AND A CHEMICAL ACTIVATOR / RESISTIVIDADE ELÉTRICA DE CONCRETOS COM DIFERENTES TEORES DE ESCÓRIA DE ALTO FORNO E ATIVADOR QUIMICO
The integrity of the rebars in reinforced concrete structures is related to the chemical and physical protection provided by the concrete layer that covers the steel. The destruction of the passivation layer precedes the onset of corrosion. Once the corrosion process starts, its rate of propagation will depend on the electrical resistivity between cathode an
Publicado em: 2005
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9. Proteínas tirosina fosfatases: propriedades e funções biológicas
Protein phosphorylation-dephosphorylation catalyzed by the opposing and dynamic action of protein kinases and phosphatases probably, is the most crucial chemical reaction taking place in living organisms. Protein phosphatases are classified according to their substrate specificity and sensitivity to inhibitory or activator agents, into two families of protei
Química Nova. Publicado em: 2003-12
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10. Crystallographic structure of the trypsin inhibitor purified from Enterolobium contortisiliquum seeds and the molecular modeling of its complexes with trypsin, trombin and Xa factor. / Estrutura cristalográfica do inibidor de tripsina purificada de sementes de Enterolobium contortisiloquum e modelagem molecular de seus complexos com tripsina, trombina e fator Xa.
The principal objective of this work was the 3D structural determination of a Trypsin inhibitor from Enterolobium contortisiliquum (EcTI) seeds as well as the modeling of the complexes between EcTI and trypsin, chymotrypsin, thrombin and factor Xa and their subsequent analysis. The inhibitor has a molecular weight of 19.5 kDa and inhibits trypsin, chymotryps
Publicado em: 2003
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11. A chemical approach to designing Turing patterns in reaction-diffusion systems.
A systematic approach is suggested to design chemical systems capable of displaying stationary, symmetry-breaking reaction diffusion patterns (Turing structures). The technique utilizes the fact that reversible complexation of an activator species to form an unreactive, immobile complex reduces the effective diffusion constant of the activator, thereby facil
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12. Isolation and amino acid sequence of a morphogenetic peptide from hydra
From Anthopleura elegantissima and from Hydra attenuata, a morphogenetic peptide—the head activator—was isolated in pure form. The sequence of the head activator was established by enzymatic and by chemical degradation of the whole peptide or fragments thereof and subsequent analysis of the amino acids by micromethods. The head activator from both source