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Search Results: 1 - 10 of 324332 matches for " Carla V. L. Coelho "
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Brazilian Indigenous Children as Carriers of Diarrheagenic Escherichia coli Pathotypes  [PDF]
Carla V. L. Coelho, Tania A. T. Gomes, M?nica A. M. Vieira, Ana Cláudia P. Rosa, Diana P. Marinho, Bernadeth L. Von S?hsten, Cristiane S. Sanfins, André R. Santos Périssé, Adriana H. Regua-Mangia
Advances in Infectious Diseases (AID) , 2018, DOI: 10.4236/aid.2018.84017
Abstract: Introduction: Diarrheagenic Escherichia coli (DEC) is a relevant cause of diarrhea, particularly among infants and young children in developing countries. Methodology: We compared the frequency, antimicrobial resistance, adherence, enterovirulence and genetic diversity of DEC isolates from Guarani indigenous population under five living in distinct villages in Brazil. Results: Of the 314 E. coli isolates from 57 children, with and without diarrhea, 15% (48/314) were classified in DEC categories: aEPEC (56%, 27/48), EAEC (35%, 17/48) and ETEC (8%, 4/48). ETEC belonged to plylogroup A, EAEC to groups A, B1, B2 and D, and aEPEC to phylogroups A, B1, and B2. EAEC exhibited the aggregative adherence phenotype while ETEC and aEPEC the aggregative and undefined patterns. Multidrug-resistance was detected in aEPEC, ETEC and EAEC while extensive drug-resistance was found in EAEC and aEPEC. RAPD typing revealed a genetically diverse bacterial population. Conclusion: This is the first report regarding aspects of DEC in an indigenous Brazilian population, showing that Guarani children are DEC carriers and that antimicrobial resistance at high levels is widely disseminated among these enteropathogens.
Efeitos do treinamento físico contra resistência sobre a composi o corporal e a potência muscular em adultos deficientes de horm nio do crescimento
Brasil Rosane R.L.O.,Concei??o Flávia L.,Coelho Carla W.,Rebello Cláudio V.
Arquivos Brasileiros de Endocrinologia & Metabologia , 2001,
Abstract: A síndrome da deficiência do horm nio do crescimento (GH) no adulto está bem estabelecida, assim como os benefícios da terapia de reposi o com o GH recombinante. Dentre as altera es observadas nesses pacientes, as da composi o corporal est o entre as mais estudadas, sendo caracterizadas por um aumento da gordura corporal total com predomínio de gordura no tronco, diminui o da massa magra, da for a muscular e da água corporal total. Todas s o quase completamente revertidas após tratamento de reposi o com GH. Estudamos a composi o corporal e potência muscular de 11 pacientes com deficiência de GH, antes e após serem submetidos a um programa de treinamento com exercícios contra resistência por 12 semanas, sem reposi o com o GH. Avaliamos a composi o corporal através de medidas de circunferências, dobras cutaneas, peso, altura, cálculo do índice de massa corporal e rela o cintura-quadril. A potência muscular localizada foi avaliada em vários grupos musculares através de cinco exercícios numa unidade de exercícios musculares localizados, onde foi acoplado um tensi metro. Após análise dos resultados, observamos que n o houve mudan a na composi o corporal destes pacientes, em rela o ao índice de massa corporal, rela o cintura-quadril e peso. Quando estudamos separadamente a soma das dobras cutaneas centrais e periféricas, houve diminui o no volume da soma das dobras centrais. Em rela o à for a e potência muscular, n o houve ganho de for a de preens o manual medida através do dinam metro (p>0,05), já a potência mostrou um aumento significativo após treinamento (p<0,01). Concluímos que esses pacientes, se submetidos a um programa de treinamento de exercícios contra resistência realizado em casa, ganham potência muscular e que esta forma de exercício é uma alternativa terapêutica para que possam melhorar sua qualidade de vida, quando n o for possível a utiliza o do GH.
Efeitos do treinamento físico contra resistência sobre a composi??o corporal e a potência muscular em adultos deficientes de horm?nio do crescimento
Brasil, Rosane R.L.O.;Concei??o, Flávia L.;Coelho, Carla W.;Rebello, Cláudio V.;Araújo, Claudio G.S.;Vaisman, Mário;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2001, DOI: 10.1590/S0004-27302001000200004
Abstract: growth hormone (gh) deficiency syndrome in adults is well established, as well as the benefits of replacement with recombinant gh. body composition changes are frequently studied in these patients, and are characterized by an increase in total body fat with predominant trunk obesity, a decrease in lean body mass, muscular strength and total body water. all of these features are almost completely reversed after recombinant gh therapy. this study evaluated body composition and muscle power in 11 gh-deficient patients before and after undergoing a resistance-training program for 12 weeks without gh replacement. we evaluated the body composition by measuring girths, skinfolds, weight, height, body mass index, waist-hip ratio and abdominal computerized tomography. muscle power was assessed in several muscle groups by mean of five exercises in a muscle-training machine, to which a tensiometer was attached. the data analysis showed that there were no changes in body composition, body mass index, waist-hip ratio and weight. when we studied separately the sum of central and peripheral skinfolds, we noted a volume reduction in the sum of central skinfolds. with relation to muscular strength and power there was no gain in handgrip muscular strength (p>0.05), whereas muscular power showed a significant increase after the training (p<0.01). we concluded that when these patients are submitted to a home-based training program of resistance - type exercises they gain muscular power, and that this type of exercise is a therapeutic alternative that can improve their quality of life whenever the use of recombinant gh is not possible.
Natural convection heat transfer in partially open enclosures containing an internal local heat source
Mariani, V. C.;Coelho, L. S.;
Brazilian Journal of Chemical Engineering , 2007, DOI: 10.1590/S0104-66322007000300007
Abstract: a numerical study was conducted to investigate steady heat transfer and flow phenomena of natural convection of air in enclosures, with three aspect ratios (h/w = 1, 2, and 4), within which there is a local heat source on the bottom wall at three different positions, wh. this heat source occupies 1% of the total volume of the enclosure. the vertical walls in the enclosures are insulated and there is an opening on the right wall. the natural convection is influenced by the difference in temperature between the left and right walls, represented by a rayleigh number (rae), and by local heat source, represented by a rayleigh number (rai). numerical simulations were performed for several values of the rayleigh number ranging between 103 and 106, while the intensity of the two effects - the difference in temperature on the vertical walls and the local heat source - was evaluated based on the rai/rae ratio in the range between 0 and 2500. the analysis proceeds by observing variations in the streamlines and isotherms with respect to the different rae, r ratios, aspect ratios, of the radius and positions of the local heat source. the average nusselt numbers on the hot and cold walls are influenced by different values of the parameters r, rae, wh, and h/w. results show the presence of different flow patterns in the enclosures studied. thus, the flow and heat transfer can be controlled by external heating, and local heat source.
Determina??o do coeficiente de atividade na dilui??o infinita () através da micro-extra??o em fase sólida (SPME)
Fonseca, Douglas B.;Coelho, Gerson L. V.;
Química Nova , 2007, DOI: 10.1590/S0100-40422007000700020
Abstract: in this study a new approach, solid phase micro extraction (spme), is used in the evaluation of the infinite dilution activity coefficient of the solute in a given solvent. it is the purpose of the current work to demonstrate a different approach to obtain the data needed for studying the solution thermodynamics of binary liquid mixtures as well as for designing multi-component separations. the solutes investigated at the temperature 298.15 k were toluene, ethyl benzene and xylene in the solvent methanol.
Adsorption of ethyl acetate onto modified clays and its regeneration with supercritical CO2
Cavalcante, A. M.;Torres, L. G.;Coelho, G. L. V.;
Brazilian Journal of Chemical Engineering , 2005, DOI: 10.1590/S0104-66322005000100008
Abstract: modified clays were used to remove ethyl acetate from aqueous solutions. these clays were regenerated using supercritical co2. structural changes in the montmorillonite clay after treatment with quaternary amines were studied. the surface properties of the modified clay changed from highly hydrophilic to highly organophilic. the clay was regenerated by percolation of a stream of co2 through the porous montmorillonite matrix. different pressures and temperatures were employed, resulting in different fluid conditions (gas, liquid, and supercritical). the experimental data was fitted with a simplified model. the best desorption result was found under supercritical conditions. a crossover effect was observed. the capacity of the modified clay as a pollutant attenuator remained almost unchanged after a regeneration cycle.
Phase equilibria of oleic, palmitic, stearic, linoleic and linolenic acids in supercritical CO2
Penedo, P. L.;Coelho, G. L. V.;Mendes, M. F.;
Brazilian Journal of Chemical Engineering , 2009, DOI: 10.1590/S0104-66322009000100013
Abstract: the knowledge of the phase equilibrium is one of the most important factors to study the design of separation processes controlled by the equilibrium. fatty acids are present in high concentration as by-products in vegetable oils but the equilibrium data involving these components is scarce. the objective of this work is the experimental determination of the liquid-vapor equilibrium of five binary different systems formed by carbon dioxide and palmitic acid (c16:0), stearic acid (c18:0), oleic acid (c18:1), linoleic acid (c18:2) and linolenic acid (c18:3). the equilibrium experimental data was collected at 40, 60 and 80oc at 60, 90 and 120 bar, at the extract and raffinate phases, using an experimental apparatus containing an extractor, a gas cylinder and pressure and temperature controllers. the data was modeled using the cubic equation of state of peng-robinson with the mixing rule of van der waals with binary interaction parameters. the model was adequate to treat the experimental data at each temperature and at all the temperatures together. the best model that includes the van der waals mixing rule with two parameters has maximum deviation of 17%. the distribution coefficients were also analyzed and it was concluded that the fractionation of the fatty acids is possible using supercritical carbon dioxide.
DESENVOLVIMENTO E PROJETO DE UMA UNIDADE DE EXTRA??O SUPERCRíTICA PARA PURIFICA??O DE óLEOS VEGETAIS
PENEDO, Pedro L. M.;COELHO, Gerson L. V;
Ciência e Tecnologia de Alimentos , 1997, DOI: 10.1590/S0101-20611997000400006
Abstract: this study examines the method to development of an industrial unity to purification of vegetable oils using extraction with co2 under supercritical conditions. aiming at the conception of a commercial plant from laboratory scale, the study must begin through determination of some experimental measurement and a study of energy required in the process. in previous work the optimum conditions (t, p) to purification of vegetable oil by supercritical co2 were determined. it was possible to deacidify, deodorize e clarify degummed vegetable oils. the step of energy optimization involves a large number of variables in operational conditions seeking to supply suitable data for definition of yield and quality of product, such as the extraction time. the representation of the process in solvent phase diagrams is more convenient to determine the thermodynamics proprieties in each stage of process . the temperature -entropy (txs) diagrams are particular suitable for determination of energy required or removed in a reversible process. after determination of the operational conditions and time to each individual stage, it is possible to plot the variation of pressure and temperature versus time , as well as to define and plan the necessary furnitures to supercritical extraction.
PURIFICA??O DE óLEOS VEGETAIS POR EXTRA??O COM CO2 SUPERCRíTICO
PENEDO, Pedro L. M.;COELHO, Gerson L. V.;
Ciência e Tecnologia de Alimentos , 1997, DOI: 10.1590/S0101-20611997000400007
Abstract: purification of vegetable oils using supercritical co2. this work presents a study on the extraction of free fatty acids from crude soy and brazil nut oils, using supercritical carbon dioxide. it was developed in two stages, at first moment we verified the possibility to extract free fatty acids from these oils and then the extraction conditions were evaluated at pressures changing between 50-140 bar and temperatures between 40-80oc during 40-160 minutes. it was concluded that it is possible to promote the deacidification of vegetable oils. experimental data has shown that an increase in pressure produces a significant increase in extraction yield, but an increase in temperature is not so signifcant, and the extraction yield was not satisfactory, it was around 30% under 140 bar and 80oc to both oils. this process was optimized by degumming crude vegetable oils before the deacidification using supercritical carbon dioxide. the degumming was performed by through two different methods, one for hydratable gums and other for nonhydratable gums. experimental data was obtained under 140 bar and 80oc during 40-160 minutes and showed that the degumming was really necessary before the deacidification in supercritical carbon dioxide. the extraction yield increased to around 57% for soy oil and 42% for brazil nut oil. the best method of degumming must remove as much hydratables gums as nonhydratables gums. finally we used cossolvent (ethanol 1-5% of oil weight) to aid in the extraction, and the extraction yield increased to around 65% to soy oil and 56% to brazil nut oil, totally deggumed.
DESENVOLVIMENTO E PROJETO DE UMA UNIDADE DE EXTRA O SUPERCRíTICA PARA PURIFICA O DE óLEOS VEGETAIS
PENEDO Pedro L. M.,COELHO Gerson L. V
Ciência e Tecnologia de Alimentos , 1997,
Abstract: Este estudo investiga os diferentes arranjos de equipamentos para o desenvolvimento de uma unidade industrial para purifica o de óleos vegetais utilizando extra o com CO2 sob condi es supercríticas. Objetivando a concep o de uma planta comercial a partir da unidade de laboratório o estudo deve iniciar-se através da determina o de alguns parametros experimentais e um estudo energético do processo. Em trabalho anterior foram definidas as condi es ótimas (T, P) para purifica o de óleos vegetais por CO2 supercrítico [7]. A etapa de otimiza o energética envolve um número máximo de varia es possíveis nas condi es de opera o, visando fornecer dados adequados para a defini o do rendimento e qualidade do produto, assim como do tempo de extra o. A representa o do processo nos diagramas de estado do solvente s o muito úteis para a determina o das propriedades termodinamicas em cada estágio do processo. Os diagramas Temperatura-Entropia (TxS) s o particularmente apropriados para determina o da energia requerida ou removida no processo reversível. Com a determina o das condi es de opera o e do tempo para cada etapa individual é possível plotar a varia o da press o e da temperatura versus tempo, assim como definir e dimensionar os equipamentos necessários para o processo de extra o supercrítica.
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