Direct Injection
Mostrando 1-12 de 538 artigos, teses e dissertações.
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1. Use of Direct Aqueous Injection and Solid Phase Extraction Coupled with Hydrophilic Interaction Chromatography to Analyze Haloacetic Acids in Drinking Water Samples
In this study, two analytical methods were evaluated to determine haloacetic acids (HAAs) in drinking water samples. Direct aqueous injection (DAI) and solid phase extraction (SPE) were evaluated and determination was performed by liquid chromatography tandem mass spectrometry (LC-MS/MS) with a hydrophilic interaction chromatography (HILIC) analytical column
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Determination of Ethyl Carbamate in Commercial Sweetened Sugar Cane Spirit by ESI-MS/MS Using Modified QuEChERS and 18-Crown-6/Trifluoroacetic Acid Spiking Additives
A fast, sensitive, and selective direct injection electrospray tandem mass spectrometry (DI ESI MS/MS) method that is able to quantify ethyl carbamate in commercial sweetened sugar cane spirit is described. The preparation method uses a modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) with potassium carbonate added to sweetened sugar cane
Journal of the Brazilian Chemical Society. Publicado em: 2022
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3. Direct steam injection pretreatment improves microwave-assisted extraction yield for total flavonoids and myricetin from Hovenia dulcis Thunb.
Abstract A direct steam injection pretreatment was added before the microwave-assisted extraction procedure for the extraction of flavonoids from seeds of Hovenia dulcis Thunb, and the antioxidant activity of flavonoid extracts was determined. Based on the experimental results, the addition of direct steam injection simultaneously increased the extraction yi
Food Sci. Technol. Publicado em: 2021-06
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4. Effects of intra-dentate gyrus microinjection of myokine irisin on long-term potentiation in male rats
RESUMO A indução de potenciação de longo prazo (LTP) aumenta a capacidade de armazenamento das sinapses no giro denteado (DG) do hipocampo. A irisina é uma miocina gerada a partir do FNDC5 (um precursor genético) durante o exercício. Embora a administração intra-Cornu Ammonis1 de irisina fortaleça a LTP em camundongos com doença de Alzheimer, os e
Arq. Neuro-Psiquiatr.. Publicado em: 10/01/2020
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5. 3D numerical investigation of mixture formation and combustion in a DISI engine at part-load under stratified operation
This work investigates through numerical simulation, the operation of a big bore direct fuel injection spark ignition engine, at part load under stratified operation. It evaluates fuel-air mixture preparation and combustion process with the adoption of detailed chemical kinetics mechanisms for both Isooctane and Ethanol, and applying adaptive mesh refinement
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2020
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6. TRANSPLANTATION OF ADIPOSE-DERIVED MESENCHYMAL STEM CELLS IN REFRACTORY CROHN’S DISEASE: SYSTEMATIC REVIEW
RESUMO Racional: Há diferentes opções de tratamento para a doença de Crohn, porém, em alguns casos, há a necessidade de outras abordagens terapêuticas, como o uso de células-tronco mesenquimais derivadas do tecido adiposo. Objetivo: Revisar sistematicamente a literatura para determinar as diferentes formas de administração das células-tronco mes
ABCD, arq. bras. cir. dig.. Publicado em: 20/12/2019
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7. Protective effect of Echinochrome against intrahepatic cholestasis induced by alpha-naphthylisothiocyanate in rats
Resumo O presente estudo destinou-se a avaliar os efeitos protetores do Ech na colestase intra-hepática em ratos induzidos por uma única injeção (i.p.) de alfa-naftilisotiocianato (ANIT) (75 mg / kg de peso corporal). Os ratos foram pré-tratados oralmente durante 48 horas (uma dose / 24 horas) com cada (1, 5 e 10 mg / kg de peso corporal) e ácido urso
Braz. J. Biol.. Publicado em: 18/04/2019
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8. Fast Triacylglycerol Screening and Semi-Quantitative Analysis of Fatty Acids in Commercial Oils by DIMS with 18-Crown-6 Ether/Trifluoracetic Acid Dopants
Vegetable oil analyses, especially due to the complexity of the oil components, are commonly laborious, requiring several analytical techniques. In this work, electrospray ionization mass spectrometry with direct injection (DIMS), along with 18-crown-6 ether (crown ether) chelating agent and trifluoroacetic acid (TFA), was used to characterize and semi-quant
J. Braz. Chem. Soc.. Publicado em: 2019-02
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9. Assisted reproductive technology: prevalence and associated factors in Southern Brazil
ABSTRACT OBJECTIVE: To assess the prevalence of successful assisted reproductive technology and to identify the associated factors. METHODS: This population-based birth cohort study was carried out with 4,333 pregnant women expected to deliver in 2015 in the urban area of Pelotas, Southern Brazil. Use of an assisted reproductive technology procedure, type
Rev. Saúde Pública. Publicado em: 31/01/2019
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10. Pelletizing furnace refractory lining life cycle extension by applying thermography analysis and direct refractory injection
Abstract The induration furnace is one of the most important devices in the pellet production system. It is responsible for ensuring the quality of pellets produced, since a high level of thermal energy is necessary to reach the physical properties needed. Therefore, the refractory lining performance is important to guarantee the quality of pellets and to av
REM, Int. Eng. J.. Publicado em: 2018-07
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11. Sexual transmission of American trypanosomiasis in humans: a new potential pandemic route for Chagas parasites
BACKGROUND The Trypanosoma cruzi infection endemic in Latin America has now spread to several countries across four continents; this endemic involves triatomine vector-free protists. We hypothesised that the sexual transmission of T. cruzi contributes to the ongoing spread of Chagas disease. OBJECTIVES A short-term longitudinal study was conducted to eva
Mem. Inst. Oswaldo Cruz. Publicado em: 2017-06
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12. ON-LINE SOLID PHASE EXTRACTION COUPLED WITH LIQUID CHROMATOGRAPHY TANDEM MASS SPECTROMETRY FOR THE DETERMINATION OF CODEINE IN HUMAN PLASMA
A specific LC-MS/MS method was developed and validated for automated determination of codeine in human plasma, using on-line solid phase extraction (SPE) system coupled with positive ion electrospray ionization tandem mass spectrometry. The method allowed plasma direct injection onto cartridge without sample pre-treatment. Total analysis time per run was 3 m
Quím. Nova. Publicado em: 2017-01