Phosphate Reactivity
Mostrando 1-12 de 111 artigos, teses e dissertações.
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1. IMIDAZOL E CATÁLISE: UM PAR PERFEITO
The imidazole (IMZ) ring presents several chemical properties that turns it into a versatile acid-basic/nucleophilic catalyst. The discovery of the biological properties of histidine (amino acid with IMZ ring) instigates the study of this class of compounds. It is found in nature in several enzymes such as chymotrypsin and RNAses due to these properties. Thi
Quím. Nova. Publicado em: 2021-03
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2. Multifunctional Imidazole-Derived Polymeric Catalyst for Dephosphorylation Reactions Potentiated by Cationic and Anionic Micelles
Results confirm the catalytic potential of imidazole groups anchored on the polymeric backbone of polyvinylimidazole (PVI) in dephosphorylation reactions with di- and tri-phosphoesters, promoting impressive enhancements up to 107-fold. We propose the imidazole groups on PVI react by nucleophilic catalysis (neutral specie) with a phosphate triester and bifunc
J. Braz. Chem. Soc.. Publicado em: 2016-02
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3. Effects of sciatic nerve transection on ultrastructure, NADPH-diaphorase reaction and serotonin-, tyrosine hydroxylase-, c-Fos-, glucose transporter 1- and 3-like immunoreactivities in frog dorsal root ganglion
Frogs have been used as an alternative model to study pain mechanisms. Since we did not find any reports on the effects of sciatic nerve transection (SNT) on the ultrastructure and pattern of metabolic substances in frog dorsal root ganglion (DRG) cells, in the present study, 18 adult male frogs (Rana catesbeiana) were divided into three experimental groups:
Braz J Med Biol Res. Publicado em: 24/05/2013
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4. Fertilizantes fosfatados para a cana-de-açúcar aplicados em pré plantio (fosfatagem) / Phosphate fertilizers for sugarcane used in pre-planting (Phosphorus fertilizer application)
A fosfatagem é ainda uma prática pouco utilizada na cultura da cana-de-açúcar e pode ser feita com fertilizantes fosfatados de efeito residual longo. Este trabalho teve como objetivo avaliar o efeito de fertilizantes fosfatados aplicados em área total antes do plantio da cana-de-açúcar na produção de colmos e qualidade da matéria prima de cana-de-a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/02/2011
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5. Sintese de cimento osseo a base de a-TCP e estudo da influencia do Mg e do Si em suas propriedades finais / a-TCP calcium phosphate cement and the influence of Mg and Si substitution on its final properties
The need for new biomaterials which could improve life quality of people who suffer from oldness diseases or who have any bone tissue injury due to accidents and diseases like obesity and cancer are resulting in a growing number of researches. In this context, the development of new orthopedics biomaterials based on calcium phosphates compounds is relevant o
Publicado em: 2010
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6. Filmes de azul da Prússia sobre ITO: estudos de pós-tratamento e estabilidade frente diferentes pHs e diferentes compostos fosfatados / Films of Prussian blue on ITO: studies of post-treatment and stability in differents pHs and differents phosphate compounds
In this work it was studied the influence of the electrochemical posttreatment parameters in potenciodinamics conditions on the stability and reactivity against organophosphates by eletrodepositaded iron (III) hexacyanoferrate (II), better known as blue of Prussia (PB). The posttreatment of the film at low sweep rates leads to the formation of the PB "solubl
Publicado em: 2008
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7. Composition of carotenoids and anthocyanins from acerola : stability and antioxidant activity of anthocyaninc extracts from acerola and açai in model-systems. / Composição de carotenoides e antocianinas em acerola : estabilidade e atividade antioxidante em sistemas-modelo de extratos antocianicos de acerola e de açai.
Natural pigments, such as anthocyanins and carotenoids, are responsible for the colors found in foods, influencing its visual aspect, which is considered the main attribute for the acceptance and preference of a food product. At the same time, these pigments show important biological functions and actions, being considered human health promoters. The associa
Publicado em: 2006
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8. Pulsed laser deposition of SiO2 - P2O5 - CaO - MgO glass coatings on titanium substrates
Thin films of bioactive glass-ceramic have been deposited on titanium substrates by the Pulsed Laser Deposition (PLD) technique under different experimental conditions. The effect of parameters such as deposition pressure and temperature of heat treatments was studied. The microstructure and the crystalline phases of the coatings were characterized using SEM
Materials Research. Publicado em: 2004-09
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9. Calcination effect of precipated magnesia on the processing of magnesia phosphate cements. / Efeito da calcinação da magnésia precipitada sobre o processamento de cimentos de fosfato de magnésio.
It is great the interest for materials synthesized at room temperature because they represent an alternative for the current problems of energy. The class of magnesia phosphate cements belongs to this group, being mouldable ceramics that combine low density and good mechanical strength in a short period of time. The main disadvantage of these materials resid
Publicado em: 2004
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10. On the protein tyrosine phosphatases. Phosphate esters intrinsic reactivity and computer simulation of the mechanisms of enzymatic reaction / Sobre as proteínas tirosina-fosfatases. Reatividade intrínseca de ésteres de fosfato e simulação computacional dos mecanismos de reação enzimática
Proteínas tirosina-fosfatases (PTPs) catalisam a hidrólise de fosfotirosina de outras proteínas e, assim, regulam importantes processos bioquímicos. Dois representantes desta família são as fosfatases de dupla especificidade VHR e CDC25B. A primeira etapa de reação catalisada é um ataque nucleofílico da cadeia lateral de uma cisteína sobre o fósf
Publicado em: 2004
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11. A química dos ésteres de fosfato
This work summarizes important aspects of the chemistry of phosphate esters, with special emphasis on: i) advances in the design of enzymatic models for phosphatases; and ii) nerve agents and currently used strategies for detoxification. The physical organic chemical aspects that are responsible by the reactivity of phosphate esters are also discussed.
Química Nova. Publicado em: 2003-10
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12. Identificação e caracterizaçã0 de frações alergenicas de baixo peso molecular do acaro Aleuroglyphus ovatus
Clinical reports have suggested an unusual frequency in skin prik test of atopic patients using Aleuroglyphus ovatus (Ao) a storage mite as allergen. To evaluate the most important Ao antigenic fractions we submitted the Ao to different conditions of extractions. Three extractiors solutions were investigated, ammonium acid carbonate, phosphate buffer saline
Publicado em: 1998