Capillary Tube
Mostrando 1-12 de 79 artigos, teses e dissertações.
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1. Incorporation of Fluorescent Dyes in Electrospun Chitosan/Poly(ethylene oxide)
Polymeric films have been increasingly investigated due to the ease of miniaturization and integration in several sensor devices. Films obtained from the electrospinning technique have a controlled diameter and homogeneity, and substances can be incorporated into the polymeric network. Electrospinning fiber of chitosan (Ch) and poly(ethylene oxide) (PEO) was
J. Braz. Chem. Soc.. Publicado em: 2021-05
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2. Development of a method for simultaneous analysis of caffeine and taurine in energy drinks by micellar electrokinetic chromatography with diode-array detector
Abstract The objective of this study was to develop, optimize and validate a fast and reliable method for the simultaneous determination of caffeine and taurine contents by micellar electrokinetic chromatography with diode array detector, using direct and indirect detection concomitantly. Multivariate statistical techniques were used as a central composite d
Food Sci. Technol. Publicado em: 16/09/2019
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3. Stimulated mast cells promote maturation of myocardial microvascular endothelial cell neovessels by modulating the angiopoietin-Tie-2 signaling pathway
Angiopoietin (Ang)-1 and Ang-2 interact in angiogenesis to activate the Tie-2 receptor, which may be involved in new vessel maturation and regression. Mast cells (MCs) are also involved in formation of new blood vessels and angiogenesis. The present study was designed to test whether MCs can mediate angiogenesis in myocardial microvascular endothelial cells
Braz J Med Biol Res. Publicado em: 22/10/2013
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4. Desenvolvimento de métodos cromatográficos para análises de antimicrobianos em amostras complexas / Development of chromatographic methods for analysis of antimicrobials in complex samples
This work describes the development of chromatographic methods in combination with microextraction techniques for the determination of parabens in cosmetic and human milk samples and of rifampicin in plasma samples. The design of a molecularly imprinted extraction phase for the solid-phase extraction (SPE) analysis of parabens in human milk samples is also r
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2012
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5. Ampliação do uso da técnica de espectrometria de absorção atômica utilizando tubo metálico na chama para determinação de prata / Enlarging the use of thermospray flame furnace atomic absorption spectrometry for determination of silver
Thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) uses a metallic tube on the flame of the atomic absorption spectrometer. The sample is introduced in the tube by a ceramic capillary. In the development of this method, the parameters involved were studied and the optimal conditions consist of using air as carrier at 0.4 mL min, 200 mL of s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/03/2012
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6. Desenvolvimento de métodos cromatográficos hifenados (in-tube SPME/LC-FLD e GCxGC/qMS) para análises de fármacos e agrotóxicos em amostras complexas / Development of hyphenated chromatographic methods (in-tube SPME/LC-FLD and GCxGC/MS) for analysis of drugs and pesticides in complex samples.
Determination of trace levels of drugs in biological fluids and multiresidue (contaminants) in food samples is extremely important because this generates valuable data for therapeutic drug monitoring (individualization of dosage regimen) and quality control (food safety), respectively. Because of the demand for analytical methods with high resolution and low
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011
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7. Determination of rheological properties of fresh concrete and similar materials in a vibration rheometer
A vibration rheometer has been developed for the purpose of determining the viscosity coefficient and the yield value of fresh concrete under vibration. The main parts of the apparatus, a test specimen and a vibration source form a unitary oscillatory system whose parameters can be measured with sufficient precision. Two types of fine grained reference mater
Materials Research. Publicado em: 22/12/2011
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8. Analyze performance of capillary tube in small refrigeration system varying the speed compressor / Análise de desempenho do tubo capilar num sistema de refrigeração de pequeno porte com variação da velocidade do compressor
The need to reduce energy consumption in refrigeration and air conditioning is a priority for the refrigeration industry. This has encouraged the development of refrigeration systems more efficient and offer better performance. In this context, increases the importance of applying new technologies to a deeper understanding of these systems and the improvemen
Publicado em: 2009
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9. Immiscible liquid-liquid displacement in capillary tubes: viscoelastic effects
The displacement of a fluid by liquid injection occurs in some practical applications like oil recovery in porous media and cementation of drilling wells. The dimensionless numbers that govern this problem are the capillary number, Reynolds number and viscosity ratio. An overview of selected oil recovery processes shows that hydrolyzed polyacrilamide and bio
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-06
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10. Aspectos analíticos em TS-FF-AAS : estudo de interferências e aplicação para a determinação de metais em vinhos e sucos / Analytical aspects of ts-ff-aas: study of interferences and application for determinations of metals in wines and grape juices
In this work, it was evaluated the effects of interferences caused by major and minor constituents on Co, Cu and Mn atomized by flame atomic absorption spectrometry (FAAS) and by thermospray flame furnace atomic absorption spectrometry (TS-FFAAS). The main concomitants were chosen according to the typical concentrations found in foods and beverages. The liqu
Publicado em: 2007
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11. Estudio de un oscilador de densidad mediante medidas de potencial eléctrico
A density oscillator or saline oscillator is a nonlinear system. It presents alternating changes on the direction of time flow, as effect of the space restrictions between two flows of different densities. The fluids are contained in different vessels interconnected by a vertical capillary. In this work a density oscillator is constructed, and the oscillatio
Revista Brasileira de Ensino de Física. Publicado em: 2006
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12. Análise de fármacos em material biológico: acoplamento microextração em fase sólida "no tubo" e cromatografia líquida de alta eficiência
A new solid phase microextraction (SPME) system, known as in-tube SPME, was recently developed using an open tubular fused-silica capilary column, instead of an SPME fiber, as the SPME device. On-line in-tube SPME is usually used in combination with high performance liquid chromatography. Drugs in biological samples are directly extracted and concentrated in
Química Nova. Publicado em: 2005-10