Secm
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Perovskite-Type Oxides La0.6M0.4Ni0.6Cu0.4O3 (M = Ag, Ba, Ce) towards the Oxygen Reduction Reaction (ORR) in Alkaline Medium: Structural Aspects and Electrocatalytic Activity
In this work, La0.6M0.4Ni0.6Cu0.4O3 (M = Ag, Ba, and Ce, denoted as LANC, LBNC, and LCNC, respectively) electrocatalysts were synthesized by the Pechini method at 1023 K for two hours in air. Rietveld refinement allowed the identification of the crystallographic phases present in all oxides. The electrocatalytic performance of these oxides towards the oxygen
J. Braz. Chem. Soc.. Publicado em: 2021-03
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2. MECANISMO DE EVOLUÇÃO DE HIDROGÊNIO DURANTE A CORROSÃO DA LIGA 2198-T8 EM MEIO CONTENDO CLORETO: UMA ABORDAGEM ELETROQUÍMICA
Corrosion is still one of the most serious and frequent problems in industries. The phenomena involved in the corrosion mechanism of Al-alloys may be explained by formation of galvanic cells between the metal matrix and heterogeneities, such as precipitates, intermetallic phases leading to potential differences and electrochemical reactions. In the cathodic
Quím. Nova. Publicado em: 2020-09
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3. Scanning Electrochemical Microscopy (SECM) Study of the Electrochemical Behavior of Anodized AZ31B Magnesium Alloy in Simulated Body Fluid
In this work, scanning electrochemical microscopy (SECM) was employed to study the corrosion behavior of anodized AZ31B magnesium alloy exposed to simulated body fluid. SECM measurements were carried out in surface generation/tip collection mode. The hydrogen evolution flux caused during corrosion of the magnesium alloy was oxidized at the ultra-microelectro
Mat. Res.. Publicado em: 28/10/2019
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4. Desenvolvimento de sensor eletroquímico para monitoramento de chumbo em resíduos de disparos de armas de fogo / Development of an electrochemical sensor for lead analysis in gunshot residues
Duas metodologias distintas foram desenvolvidas para a determinação de chumbo em Resíduos de Disparos de Armas de Fogo (RDAF) utilizando microeletrodo de ouro. Na primeira delas, a superfície eletródica foi modificada com filme de bismuto em meio alcalino (pH = 13) e na outra as análises foram realizadas com microeletrodo não modificado em meio ácido
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2011
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5. Fabricação de microeletrodos para aplicações em microscopia eletroquímica de varredura / Fabrication of microelectrodes for applications in scanning electrochemical microscopy
In this study, platinum microelectrodes were fabricated with a Micropipette Puller and used in Scanning Electrochemical Microscopy (SECM) to obtain information on the acid erosion of tooth enamel. The sealing and polishing of the active area of the fabricated devices are considered critical steps in the construction process, hence a vacuum pump was used to e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/08/2011
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6. Adsorptive stripping voltammetric determination of nitroimidazole derivative on multiwalled carbon nanotube modified electrodes: influence of size and functionalization of nanotubes
1-Metil-4-nitro-2-bromometilimidazol (4-NimMeBr) foi eletroquimicamente reduzido em eletrodos de mercúrio, carbono vítreo e carbono vítreo modificado com nanotubos de carbono de parede múltipla (MWCNT). 4-NimMeBr adsorveu no eletrodo de carbono vítreo modificado com nanotubos de carbono, tornando possível a implementação de um método de quantificaç
Journal of the Brazilian Chemical Society. Publicado em: 2011-07
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7. Scanning electrochemical microscopy: study of the deposition and stripping mechanism of lead in the presence of copper
Este artigo descreve a utilização da microscopia eletroquímica de varredura (SECM) no modo geração pelo substrato/coleta pela ponta (SG/TC), com o objetivo de elucidar aspectos mecanísticos da deposição eletrolítica e redissolução anódica de íons Pb2+ na presença de Cu2+, utilizando-se um eletrodo de carbono vítreo como substrato. Um pico anó
Journal of the Brazilian Chemical Society. Publicado em: 2011-06
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8. Desenvolvimento de genossensores utilizando microbalança de cristal de quartzo e técnicas eletroquímicas / Genossensors development using quartz crystal microbalance and electrochemical techniques
A proliferação de algas tóxicas em diferentes oceanos pode causar perdas econômicas e ambientais devido a mortandade de animais marinhos como moluscos e peixes devido as toxinas que estas liberam no ambiente. Os motivos que levam a proliferação destas algas não são completamente compreendidos e desta forma o monitoramento das algas é de extrema impo
Publicado em: 2011
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9. CORROSION OF ADVANCED STAINLESS STEEL IN PHYSIOLOGICAL SOLUTIONS / Corrosão de aços inoxidáveis avançados em meios fisiológicos
The main objective of this study was to determine the corrosion behavior of advanced stainless steels (SS) in physiological solutions to evaluate their potential for use as biomaterials. Four stainless steels were tested: a superferritic stainless steel (DIN W. Nr. 1.4575), Incoloy MA 956, containing aluminum and yttrium oxide, an austenitic stainless steel
Publicado em: 2008
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10. SecM facilitates translocase function of SecA by localizing its biosynthesis
“Arrest sequence” of Escherichia coli SecM interacts with the ribosomal exit tunnel and arrests its own translation elongation, which is released by cotranslational export of the nascent SecM chain. This property of SecM is essential for the basal and regulated expression of SecA. Here we report that SecM has an additional role of facilitating SecA activ
Cold Spring Harbor Laboratory Press.
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11. Critical Regions of secM That Control Its Translation and Secretion and Promote Secretion-Specific secA Regulation
SecA is an essential ATP-driven motor protein that binds to presecretory or membrane proteins and the translocon and promotes the translocation or membrane integration of these proteins. secA is subject to a protein secretion-specific form of regulation, whereby its translation is elevated during secretion-limiting conditions. A novel mechanism that promotes
American Society for Microbiology.
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12. Translocon “Pulling” of Nascent SecM Controls the Duration of Its Translational Pause and Secretion-Responsive secA Regulation
SecA is an ATPase and motor protein that drives protein translocation across the bacterial plasma membrane. In Escherichia coli SecA levels are regulated by the secretion needs of the cell utilizing secM, which encodes a secreted protein. Previous studies demonstrated that this regulation requires a translational pause within secM, whose duration regulates t
American Society for Microbiology.