Microelectrodes
Mostrando 1-12 de 494 artigos, teses e dissertações.
-
1. Characterization of copper microelectrodes, following a homemade lithography, technique, and gold electroless deposition
We report the fabrication and characterization of copper microelectrodes obtained by a homemade lithography technique and after gold electroless deposition. For the fabrication, planes consisting of arrays of electrodes (black in color) with bow tie shape were designed and printed on a transparent paper (Canson ltd.). Using an embroidery frame with a silk fa
Matéria (Rio J.). Publicado em: 2016-03
-
2. Polytetrafluorethylene Membrane-Based Liquid Three-Phase Micro Extraction Combined with
in situ Differential Pulse Anodic Stripping Voltammetry for the Determination of Cadmium Ions Using Au-Nanoparticles Sol-Gel Modified Pt-WireIn this study, one particular application of in situ pulse anodic stripping voltammetry and polytetrafluoroethylene membrane-based liquid three-phase micro extraction is presented for the micro extraction and quantification of cadmium(II) ions in trace levels. The main factors influencing on preconcentration and micro extraction of cadmium ions
J. Braz. Chem. Soc.. Publicado em: 2015-07
-
3. GABA-induced inactivation of Cebus apella V2 neurons: effects on orientation tuning and direction selectivity
We investigated the GABA-induced inactivation of V2 neurons and terminals on the receptive field properties of this area in an anesthetized and paralyzedCebus apella monkey. Extracellular single-unit activity was recorded using tungsten microelectrodes in a monkey before and after pressure-injection of a 0.25 or 0.5 M GABA solution. The visual stimulus consi
Braz J Med Biol Res. Publicado em: 22/07/2013
-
4. Avaliação da corrosividade do etanol combustível utilizando arranjo de microeletrodos / Corrosion evaluation in ethanol fuel using microelectrodes array
This work presents an investigation on the corrosion of cooper metal, using a microelectrode array building using lithography technique. The influence of microelectrode array area was investigated on the ohmic drop and resistance of ethanol. The results were then compared with existing theoretical methodologies and good agreements were found. It was conclude
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
-
5. Increased coherence among striatal regions in the theta range during attentive wakefulness
The striatum, the largest component of the basal ganglia, is usually subdivided into associative, motor and limbic components. However, the electrophysiological interactions between these three subsystems during behavior remain largely unknown. We hypothesized that the striatum might be particularly active during exploratory behavior, which is presumably ass
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-08
-
6. 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
-
7. Estratégia terapêutica após contusão da medula espinhal: recuperação funcional e estabilidade cortical sensório-motora / Therapeutic strategy after spinal cord contusion: functional recovery and sensorimotor cortical stability
Spinal cord injury (SCI) results in a devastating condition, which leads to motor and sensory deficits that impair the injured person functional performance. Spinal cord injury experimental models are used in sensory-motor functioning and reorganization or plasticity promoted by trainings investigation. Thus, these studies can corroborate with current and fu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2011
-
8. Determinação da densidade de corrente de corrosão em meios de baixa condutividade: uso de microeletrodos para minimizar a queda ôhmica
The gravimetric and electrochemical tests are the most common techniques used in determining the corrosion rate. However, the use of electrochemical polarization is limited to electrolytes with sufficient conductivity for which Tafel curves are linear. In this study, we investigated a technique in which working microelectrodes of AISI 1020 steel were used to
Química Nova. Publicado em: 2011
-
9. Caracterização do mecanismo de controle do pH no tubo digestivo de Lutzomyia longipalpis (Lutz e Neiva, 1912) (Diptera: Psychodidae) e sua importância no desenvolvimento de Leishmania Ross, 1903
The midgut pH control is a key step during Lutzomyia longipalpis digestion process. Phlebotomines have to change from a favorable carbohydrate digestion (luminal pH = 6) to blood digestion (luminal pH~8). Until blood ingestion, the acidic pH in the midgut is rigorously maintained closely to pH 6 by an efficient mechanism. Apparently, alkalization in the abdo
Publicado em: 2010
-
10. Study of electrochemical detection, using modified electrodes policinilina in view the development of microsensors for the detection of food additives / Estudo da detecção eletroquimica, empregando eletrodos modificados com policinilina, tendo em vista o desenvolvimento de microssensores para a detecção de aditivos alimentares
This work presents a study for development of a microsensor for electrochemical analysis that can be applied in detection of food additives as sulfites and ascorbic acid. The development of low cost electrochemical instrumentation as alternative for commercial instrumentation available is a solution for any problems that appear in electrochemical sensors res
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/12/2009
-
11. Métodos para fabricação de microeletrodos visando a detecção em microambientes
Analysis at microenvironments, like single cells or in minute volumes (nL), is an area of great interest for analytical and biological sciences. Measurements at these experimental conditions demand analytical tools (microelectrodes) capable of monitoring with rapid response, good resolution and minimal perturbation of the system. The major drawbacks in produ
Química Nova. Publicado em: 2009
-
12. Electrosynthesis and characterizations of polypyrrole-2-carboxylic acid for application as amperometric biosensor constructed in microelectrodes / Eletrossíntese e caracterização de filmes de polipirrol-2-ácido carboxílico para uso em biossensores amperométricos construídos em eletrodos miniaturizados
In this work, we present the electrochemical synthesis of a new conducting polymer derived of polypyrrole (PPI) functionalized by carboxylic group, the polypyrrole-2-carboxylic acid, and its application as amperometric transducer in biosensor by use of polyphenol oxidase (PFO). All the steps of syntheses and characterization of the polymer film in microelect
Publicado em: 2009