Reactivity Stability
Mostrando 13-24 de 98 artigos, teses e dissertações.
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13. Ressonância: desenvolvimento, utilização e avaliação de um software educacional
Resonance is a useful concept that shows how electrons are shared between two or more atoms and allows a prediction of the chemical reactivity and relative stability of reagents, intermediates, and products. An educational software that enables interactive exploration of the concepts related to resonance and thereby facilitates its understanding was develope
Quím. Nova. Publicado em: 2014-04
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14. Target-directed catalytic metallodrugs
Most drugs function by binding reversibly to specific biological targets, and therapeutic effects generally require saturation of these targets. One means of decreasing required drug concentrations is incorporation of reactive metal centers that elicit irreversible modification of targets. A common approach has been the design of artificial proteases/nucleas
Braz J Med Biol Res. Publicado em: 02/07/2013
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15. Investigação teórica da quimisssorção do ânion metanossulfonato em eletrodos de platina (111) e (100) via método semi-empírico
Several electrochemical processes, such as electrocatalysis of organic substrates, make use of mediators. One of the mediators is the most commonly used anion methanesulfonate, CH3SO3, which has several advantages for such use, and chemical stability considered one of them. However, experimental studies indicate the possibility of this compound suffer the ad
Publicado em: 2010
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16. Use of biomimetic systems at the preparation of amperometric sensors / Utilização de sistemas biomiméticos no Preparo de sensores amperométricos
This work describe the immobilization of the copper(II) dinuclear complex ([Cu2(apyhist)2Cl2](ClO4)2), (apyhist =[(4-imidazolyl)ethylene-2-amino-1-ethylpyridine]), and others similar copper(II) compounds mono- and tetranuclears, obtained in water solution or for desprotonation of the imidazole ligant, in the Nafion membrane on glass carbon electrode surface,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/09/2009
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17. Influence of Glatiramer acetate on the synaptic stability and glial reaction during the EAE and after motor root avulsion / Influencia do acetato de glatiramer (AG) sobre a estabilidade sinaptica e reação glial durante o curso da EAE e apos avulsão de raizes motoras
Multiple sclerosis (MS) is an inflammatory and demyelinating disease, which etiology is unknown. Although it is the result of a major autoimmune response. The Glatiramer acetate (GA) is a drug used to treat MS and is composed by four peptides homologous to the myelin basic protein (MBP), that is able to reduce the exacerbation and injuries to the CNS. Nevert
Publicado em: 2009
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18. Nanoparticles of chitosan and n-carboxymethylchitosan in the incorporation of antioxidant idebenone / Nanopartículas de quitosana e n-carboximetilquitosana na incorporação do antioxidante idebenona
A Idebenona (IDB) é um fármaco antioxidante, análogo da coenzima Q10 que inibe a peroxidação lipídica, protegendo assim as células e a membrana mitocondrial do dano oxidativo. A IDB tem características lipofílicas e apresenta efeito irritante na pele, sendo um candidato potencial para a incorporação em sistema de liberação modificada, que preser
Publicado em: 2009
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19. 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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20. Utilization of tannin adhesive in the production of particleboards and OSB. / Utilização de adesivos à base de taninos na produção de painéis de madeira aglomerada e OSB.
The general objective of this work was to evaluate the possibility of use of tannin from wattle (acacia) and its mixtures with tannin of barks from E. pellita and with adhesive Phenol- Formaldehyde for glueing of particleboards and OSB. This work was divided in three chapters. In the first one, tannins from Eucalyptus pellita bark had been gotten in differen
Publicado em: 2008
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21. CaracterizaÃÃo de ligante asfÃltico brasileiro e avaliaÃÃo da presenÃa de hidrocarbonetos policÃclicos aromÃticos (HPAs) / Characterization of brazilian binder processed and evaluation of the presence of hydrocarbons polycyclic aromatics (HPAs)
The Brazilian binder processed at Petrobras/Lubnor from a crude of the state of EspÃrito Santo was investigated using the following procedures: spectrometric methods (RMN and FTIR), chromatographic (GPC), thermal analysis (TGA) and atomic microscopy (AFM). The two main fractions of the binder, maltenes and asphaltenes, were also analyzed. Hydrocarbons polyc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2007
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22. Incorporação de enxofre no silicato dicálcico do clínquer de cimento Portland: influência na estabilidade de polimorfos e na reatividade hidráulica / Sulfur incorporation on dicalcium silicate of Portland cement clinker: influence on polymorphic stability and hydraulic reactivity
The present study regards the incorporation of sulfur in dicalcium silicate (Ca2SiO4), a crystalline phase that represents 20 to 40 wt. % of the common Portland cement clinker. In the cement industry this compound is known as C2S (2CaO.SiO2) or belite. It has five polymorphs, and the monoclinic high temperature ?-C2S has the highest reactivity with water. Th
Publicado em: 2007
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23. Graphite Functionalized in Conditions of Friedel-Crafts Reaction mediated by Radiation of Microwave: New Material for Construction of Electrodes of Carbon Paste / Grafite funcionalizada em condições de Friedel-Crafts mediada por radiação de microondas: novo material para construção de eletrodos de pasta de carbono
Modification and/or functionalization of eletrodic materials have been investigated in order to improve the application of chemically modified electrode (CME) regards on their sensitivity, selectivity and reactivity comparing with unmodified substrate. However, the stability and reproducibility of these CME are one of the most important goals to achieve main
Publicado em: 2007
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24. Exposição e reatividade do prematuro ao ruído intenso durante o cuidado em incubadora / The Preterm babiesexposition and reactivity at the intense noise during care in incubators.
Introduction: The sound levels found in incubators and the additional noise generated during the manipulation of them reveal that the preterm and high-risk newly born babies (RN) are exposed to a noisy environment and are kept for long periods in this environment without chance to have auditive rest. Objectives: To evaluate the exposition of premature babies
Publicado em: 2007