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RISS 인기검색어
- 검색키워드
- 저자 : V. Soare (검색결과 5 건)
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Rubieli Carla Frezza Zeferino,Vinicius Aleixo Angonese Piaia,Vinícius Tres Orso,Vítor Machado Pinheiro,Micheli Zanetti,Gustavo Lopes Colpani,Natan Padoin,Cíntia Soares,Márcio Antônio Fiori,Humberto Gr 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
This work aims to synthesize neryl acetate from the nerol esterification reaction with acetic anhydridethrough heterogeneous catalysis using the ion exchange resin Lewatit GF 101. The reaction was monitoredby gas chromatography and the neryl acetate chemical structure was confirmed by mass spectrometryand nuclear magnetic resonance spectroscopy. The variables effect on the neryl acetate synthesiswas evaluated from an experimental design analysis. The reaction showed the highest combined valuesfor nerol conversion (98.11%) and neryl acetate selectivity (86.10%) at 30 min within optimal experimentalconditions of temperature at 40 C, catalyst content at 7% wt, molar ratio at 1:4 (nerol: acetic anhydride),agitation speed at 250 rpm and nerol content at 3 mmol. The complete nerol conversion wasachieved at 40 min with 82.34% selectivity. The reaction rate was controlled only by the nerol decay,an expected behavior due to the excess of acetic anhydride used. In addition, the value obtained forthe main reaction kinetic constant found by a pseudo-homogeneous model was 6 times greater than thatof the parallel reaction. The catalyst reuse was investigated and after 3 cycles a high conversion (96.68%)and selectivity (83.78%) were observed indicating a low loss of the catalytic activity.
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H. Puga,V. H. Carneiro,J. Barbosa,D. Soares 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5
The present study evaluates the role of the microstructure in the static and dynamic mechanical behavior of as-cast Al7075 alloy promoted by ultrasonic treatment (US) during solidification. The characterization of samples revealed that US treatment promoted grain and intermetallics refinement, changed the shape of the intermetallic phases (equilibrium phases of soluble M and/or T (Al, Cu, Mg, Zn) and their insoluble Al-Cu- Fe compounds) and lead to their uniform distribution along the grain boundaries. Consequently, the mechanical properties and damping capacity above critical strain values were enhanced by comparison with values obtained for castings produced without US vibration. This results suggest that the grain and secondary phases refinement by US can be a promising solution to process materials to obtain high damping and high strength characteristics.
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Raul Payri,F. J. Salvador,J. Gimeno,V. Soare 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.11
The present paper centers on the establishment of a quantified relationship between the macroscopic visual parameters of a Diesel spray and its most influential factors. The factors considered are the ambient gas density, as an external condition relative to the injection system, and nozzle hole diameter and injection pressure as internal ones. The main purpose of this work is to validate and extend the different correlations available in the literature to the present state of the Diesel engine, i.e. high injection pressure, small nozzle holes, severe cavitating conditions, etc. Five mono-orifice, axi-symmetrical nozzles with different diameters have been studied in two different test rigs from which one can reproduce solely the real engine in-cylinder air density, and the other, both the density and the pressure. A parametric study was carried out and it enabled the spray tip penetration to be expressed as a function of nozzle hole diameter, injection pressure and environment gas density. The temporal synchronization of the penetration and injection rate data revealed a possible explanation for the discontinuity observed as well by other authors in the spray’s penetration law. The experimental results obtained from both test rigs have shown good agreement with the theoretical analysis. There have been observed small but consistent differences between the two test rigs regarding the spray penetration and cone angle, and thus an analysis of the possible causes for these differences has also been included.
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Therapeutic Potential of Bauhinia forficata Link in Dental Biofilm Treatment
Julio Cesar C. Ferreira-Filho,Andressa Temperini de Oliveira Marre,Juliana Soares de Sa Almeida,Leandro de Araujo Lobo,Adriana Farah,Maria Teresa Villela Romanos,Lucianne Cople Maia,Ana Maria Gondim V 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.9
The oral cytotoxicity, antimicrobial and anti-demineralizing effects of a tincture from Bauhinia forficata Link tincture (BFLT) were evaluated in vitro and ex vivo. Susceptibility tests (minimum inhibitory and microbicidal concentrations-MIC and time-kill assay-MMC) were performed against planktonic oral microorganisms. The contents of phenolic compounds were investigated. Cytotoxic potential was evaluated on oral fibroblasts after 1–5 min exposure to BFLT. Blocks of sound bovine enamel (N = 60) were inoculated with a saliva pool and sustained in a multiple plaque growth system for 48 h to form a biofilm. Biofilm blocks were randomly divided into groups-G (n = 10): G1-Baseline (48 h maturation biofilm), G2-BFLT 23.2 mg/mL, G3-Ethanol 81.20 g/mL, G4-Chlorhexidine 0.12%, G5-Growth control, and G6-Blank control. Treatments (50 μL/1 min) were performed once a day for a week. Streptococcus spp. (S) and total microorganism (TM) counts were expressed as Log10 CFU/mL. Biofilm height was evaluated by confocal microscopy analyses (CMA). Final surface hardness was assessed and percentage of microhardness loss (% MHL) was calculated. Results were significant when P < .05. BFLT inhibited all tested microorganisms (MIC = 1.3–23.2 mg/mL) and promoted optical reduction (0.05–0.22 nm) of all microorganisms after 48-h treatment compared with controls. After 5-min treatment, BFLT showed low values of cell death (3.20%). G2-BFLT reduced S (6.61 ± 0.20) and TM (7.14 ± 0.38) compared with G1-Baseline (S = 7.82 ± 0.28; TM = 8.81 ± 0.67) and G5-Growth control (S = 7.48 ± 0.39; TM = 7.89 ± 0.68); but G4-chlororexidine (S = 6.11 ± 0.48; TM = 6.45 ± 0.16) showed the highest antibiofilm activity. CMA was not different among treatment groups. G2 showed lower % MHL compared with G5, although G4 presented the lowest. Results suggest BFLT is beneficial against dental caries, showing antimicrobial effects against a mature dental biofilm and no cytotoxicity.
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Antidiabetic and Antilipidemic Effects of Manilkara zapota
Sandra Maria Barbalho,Patrı´cia Cincotto dos Santos Bueno,De´bora Souza Delazari,Elen Landgraf Guiguer,,Daniel Pereira Coqueiro,Adriano Cressoni Arau´jo,Maricelma da Silva Soares de Souza,Fla´via M.V. 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.3
Manilkara zapota is a tropical evergreen tree belonging to the Sapotaceae family; its parts are used in alternative medicine to treat coughs and colds and possess diuretic, antidiarrheal, antibiotic, antihyperglycemic, and hypocholesterolemic effects. There are no studies on metabolic profile after using the fruit, and this study aimed at evaluating the effects of the leaf and pulp of M. zapota fruit on the metabolic profile of Wistar rats. Male rats were treated for 50 days with M. zapota leaf juice or fruit juice, after which their biochemical and body composition profiles were analyzed (glycemia, triglycerides, high-density lipoprotein cholesterol (HDL-c), insulin, leptin, aspartate transaminase, alanine aminotransferase, Lee Index, and body mass index). Our results indicate significantly lower levels of glycemia, insulin, leptin, cholesterol, and triglycerides and augmented levels of HDL-c in animals treated with the leaves or fruit of this plant. The percentage of weight gain also declined in animals treated with M. zapota fruit pulp. The use of the M. zapota may be helpful in the prevention of obesity, diabetes, dyslipidemia, and their complications.
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