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Search Results: 1 - 10 of 41906 matches for " Antonio Vinícius Holanda BARBOSA "
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The Property of Portland Cement and its Employment in Dentistry: Review of the Literature
Antonio Vinícius Holanda BARBOSA,Claudia CAZAL,Daniela Cavalcante de Andrade NASCIMENTO,Diórgia Fabiana Santos VALVERDE
Pesquisa Brasileira em Odontopediatria e Clínica Integrada , 2007,
Abstract: Objective: The aim of the present study was to investigate the performance of the Portland cement when used as material in the dentistry. Methods: It was accomplished a bibliographical research using scientific goods published in national and international literature, which intended to evaluate the physical properties, chemical and biological behavior, as well as the antimicrobial activity of this product. In the selected article, the authors used methods of investigation in vitro and in vivo for study comparing the cement with materials consecrated in dentistry. Conclusion: In agreement with the consulted bibliography it was possible to ensure the similarity in the chemical composition between the Portland cement and the MTA, in the effectiveness of the sealing ability of the roads areas between the root canal and the periodontal tissue, satisfactory antimicrobial action, and demonstrate favorable biological properties, stimulating the deposition of the cement and inducing the reparative pulpar answer.
Preparation and Characterization of Chitosan-Insulin-Tripolyphosphate Membrane for Controlled Drug Release: Effect of Cross Linking Agent  [PDF]
Holanda Adriana Lima, Fook Marcus Vinícius Lia, Swarnakar Ramdayal
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2014, DOI: 10.4236/jbnb.2014.54025
Abstract: The term Diabetes Mellitus (DM) comprises a group of metabolic disorders characterized by chronic hyperglycemia resulting from defects in the secretion and/or action of insulin. The Insulin therapy constitutes the preferred treatment for DM, consisting of daily subcutaneous insulin injections to control blood glucose levels. The chitosan studied for Biomedicine is a biomaterial that can be used for controlled release of drugs whose release rate can be controlled by Sodium Tripolyphosphate (TPP), which is an ionic cross linker of the chitosan. Present study, therefore, was aimed to develop and evaluate membranes of chitosan and chitosan cross linked by TPP for use in controlled release of insulin system, with the purpose of obtaining an alternative to the injectable administration of this drug. The developed membranes were characterized by the techniques of Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), High Performance Liquid Chromatography (HPLC) and Evaluation of Cell Viability of Macrophages (MTT). With the FTIR technique the interaction between chitosan, tripolyphosphate and insulin was identified. Chemical elements present in chitosan, insulin and sodium tripolyphosphate membranes were detected by EDX technique. By SEM technique, the changes in the morphology of the membrane containing insulin, with the presence of granular particles of varying sizes, could be observed when compared to pure chitosan. With HPLC assay insulin was identified and it was shown that it gets separated from chitosan membrane even when the membrane was cross linked by the TPP, though at a reduced rate. The crosslinking agent was effective to control the rate of insulin release. The biocompatibility of the prepared membranes was confirmed by cell viability of macrophages using the MTT assay. The developed membranes, therefore, have potential for use as a biomaterial in controlled release systems for insulin.
Identifica o e análise de tráfego malicioso através do uso de honeypots
Vinícius Batistela,Marco Antonio Trentin
Revista Brasileira de Computa??o Aplicada , 2009, DOI: 10.5335/rbca.2012.423
Abstract: O conceito de honeypot representa uma nova abordagem na área de seguran a de redes de computadores, que envolve por exemplo, a utiliza o de computadores atuando como sensores, a fim de identificar atividades maliciosas na rede. Assim, o presente trabalho utilizou esta nova abordagem e, através da utiliza o de um honeypot atuando como sensor na Internet, buscou identificar a presen a de atividades que possam ser consideradas maliciosas. A partir disso, o tráfego malicioso detectado pelo honeypot foi analisado e após relatos a seu respeito foram feitos, bem como apresentadas informa es, tais como a quais servi os disponíveis da rede ele se refere, quais foram suas origens e, no caso da identifica o da presen a de algum malware, como ele pode ter entrado.
Modelos experimentais em pesquisa
Ferreira, Lydia Masako;Hochman, Bernardo;Barbosa, Marcus Vinícius Jardini;
Acta Cirurgica Brasileira , 2005, DOI: 10.1590/S0102-86502005000800008
Abstract: the purpose of this study is to collect the main classifications of experimental research models and their possible applications in experimental research. literature search was done using the most important data bank available on the internet (pubmed, medline, scielo, lilacs, cochrane). a compilation of the experimental studies developed at the plastic surgery post graduate program of the federal university of s?o paulo/ paulista school of medicine was also done. animals models were classified regarding sanitary and genotipical status. the understanding of the main classifications of the research experimental models is essential to improve and confirm procedures and techniques already described as well as the development of new ones.
Growth performance of Nile tilapia, Oreochromis niloticus, fingerlings reared in Na2CO3 limed waters = Desempenho produtivo de alevinos de tilápia nilótica, Oreochromis niloticus, em aquários submetidos à calagem com Na2CO3
Davi de Holanda Cavalcante,Renan Loiola Barros,Marcelo Vinícius do Carmo e Sá
Acta Scientiarum : Animal Sciences , 2010,
Abstract: Current experiment was undertaken during 6 weeks with Nile tilapia,Oreochomis niloticus, fingerlings (1.28 . 0.03 g) to assess the effects of moderate Na2CO3 liming on water quality and fish growth performance. Twenty-four 25 L-aquaria, with 15 fish per aquarium, were used, of which twelve aquaria were placed in the lab’s indoor room and twelve in the outdoor area. Two types of water (clear or green) and three different water-quality managements (none, HCl acidification and Na2CO3 liming) were simultaneously evaluated in a 3 x 2 factorial design. Total ammonia, calcium hardness, pH and total alkalinity in the green water aquaria were significantly higher than rates in the clear water aquaria. Slight liming acid water with Na2CO3 did not produce any significant effect on its water calcium hardness. No significant differences between controls and theexperimental group were observed for any growth variables. Lime rearing water with Na2CO3 has no significant effect on tilapia growth performance if the initial total alkalinity of water is higher than 20 mg CaCO3 L-1. O presente estudo foi realizado por seis semanas com alevinos de tilápia do Nilo, Oreochromis niloticus (1,28 . 0,03 g), para avaliar os efeitos da calagem moderada da água de cultivo com Na2CO3 naqualidade da água e no desempenho produtivo dos peixes cultivados. Vinte e quatro aquários de polietileno de 25 L foram utilizados para manter os peixes experimentais (15 peixes por aquário). Doze aquários foram instalados na sala interna do laboratório e 12 aquários na área externa. Dois tipos de águas (claras, sem fitoplancton ou verdes,ricas em fitoplancton) e três diferentes manejos de qualidade de água (nenhum, acidifica o com HCl ou calagem com Na2CO3) foram avaliados simultaneamente em delineamento fatorial 3 x 2. A concentra o de am nia total, dureza cálcica, pH e alcalinidade total das águas verdes foram significativamente maiores que para as águas claras. A calagem das águas fracamente ácidas com Na2CO3 n o produziu nenhumefeito significativo na dureza cálcica da água. N o se observaram diferen as significativas entre os grupos-controle e o grupo experimental para nenhuma das variáveis de desempenho produtivo observadas. Concluiu-se que fazer a calagem da água de cultivo de tilápias com Na2CO3 n o trará nenhum benefício ao desempenho zootécnico dos peixes se a alcalinidade inicial da água exceder 20 mg L-1 de CaCO3.
Association of the bovine major histocompatibility complex (BoLA) BoLA-DRB3 gene with fat and protein production and somatic cell score in Brazilian Gyr dairy cattle (Bos indicus)
Nascimento, Carlos Souza do;Machado, Marco Antonio;Martinez, Mario Luiz;Silva, Marcos Vinícius G. Barbosa da;Guimar?es, Marta Fonseca Martins;Campos, Ana Lúcia;Azevedo, Ana Luisa Sousa;Teodoro, Roberto Luiz;Verneque, Rui da Silva;Guimar?es, Simone Eliza Facioni;Oliveira, Denise Aparecida Andrade;
Genetics and Molecular Biology , 2006, DOI: 10.1590/S1415-47572006000400011
Abstract: the effect of the bovine major histocompatibility complex (bola) locus on animal health may be due to a direct action of its alleles on immune functions, whereas its indirect effect on production traits might be explained by the better general health conditions of more productive animals. in the present study, the bola-drb3 gene was investigated in 1058 cows belonging to seven brazilian gyr dairy herds (bos indicus, zebu cattle). a total of 37 alleles were identified, 15 of them described for the first time in a zebu breed. a highly significant association (p < 0.02) was observed between allele *54 and a decrease (-26.1 kg) in milk protein yield and there was a significant association (p < 0.05) between this allele and lower (-26.07 kg) milk fat yield. there was also a significant association (p < 0.05) between allele *6 and decreased (-12.47 kg) milk protein and allele *7 and increased (12.72 kg) milk protein. there were also indications of association (p < 0.10) between somatic cell score (scs) and alleles *3 (scs increased by 0.54 units) and *31 (scs increased by 0.46 units). the highly significant association of allele *54 with lower protein yield suggests the possible use of this allele in marker-assisted selection programs.
Blendas compatíveis de amido termoplástico e polietileno de baixa densidade compatibilizadas com ácido cítrico
Miranda, Vinícius R.;Carvalho, Antonio J. F.;
Polímeros , 2011, DOI: 10.1590/S0104-14282011005000067
Abstract: blends of citric acid-modified thermoplastic starch (tps) and low density polyethylene (ldpe) were prepared by reactive extrusion (rex) and characterized by scanning electron microscopy (sem) of the fragile fracture surfaces, fourier-transform infrared spectroscopy (ftir), water absorption in 53% relative humidity environment and by x-ray diffraction. the modified tps was prepared by the reactive extrusion of a mixture of corn starch, citric acid and glycerol (30%). tps-ldpe blends were then prepared by the processing of tps and pebd both in pellets in a single screw extruder. it was observed an important compatibilization effect, attributed to the reduction of tps melt viscosity and consequently the reduction of the interfacial tension between tps and pebd phases. the ftir spectra showed shifting of starch bands confirming the compatibilization effect of citric acid. important change on blend morphology as function of the tps modification were observed, in particular for the blends prepared with the addition of 1,0 - 1,5% ac which showed a more homogeneous and finer dispersed phase.
Evolu o dos Arranjos Produtivos Locais (Apl ) de cal ados no Brasil: uma análise a partir dos dados da RAIS = Evolution of the shoes productive arrangements (LPA) in Brazil: an data analysis from RAIS
Vidigal, Vinícius Gon?alves,Campos, Antonio Carlos de
Análise , 2011,
Abstract: O objetivo desse artigo é revelar e avaliar a evolu o da atividade produtiva dos APLs cal adistas do Vale do Sinos (RS), de Franca (SP), de Birigui (SP) e de Nova Serrana (MG) ao longo do período entre 1995 e 2006. Conduziu-se levantamento de bibliografia referente aos principais APLs do setor de cal ados no Brasil e utilizou-se de dados secundários provenientes da RAIS/MTE. Os resultados demonstraram varia es positivas e crescentes nos números de empresas e de trabalhadores desses arranjos, assim como na sua propor o em rela o ao setor cal adista nos seus respectivos estados e no Brasil. Aqueles que apresentaram maiores aumentos de representatividade em rela o ao setor cal adista nacional foram notadamente os polos do Vale do Sinos e de Franca, seguidos por Nova Serrana, enquanto Birigui apresentou leve redu o. Tal fato nos induz a acreditar que a organiza o no formato de arranjos produtivos locais vem gerando efeitos positivos ao desenvolvimento desse setor nessas regi es analisadas. The objective of this work is to reveal and evaluate the evolution of the shoe industry LPAs of Vale do Sinos (RS), Franca (SP), Birigui (SP) and Nova Serrana (MG) over the period between 1995 and 2006. A survey of literature referring to the main productive arrangements of that sector was conducted and secondary data from RAIS/MTE was used. The results demonstrated growing and positive variations on the number of companies and workers of these arrangements, as well on their proportion in relation to the shoe industry in the respective states and in Brazil. Those that presented higher increase in participation in relation to the national shoe industry were notably the poles of Vale do Sinos and Franca, followed by Nova Serrana, whereas Birigui presented small reduction. This fact leads us to believe that the organization in the format of local productive arrangements is generating positive effects to development of the shoe industry in these regions.
Effect of supplementation of branched chain amino acids in muscle damage induced by resistance training
Marangon Antonio,Lacerda Vinícius,Corrêa Ronald
Journal of the International Society of Sports Nutrition , 2010, DOI: 10.1186/1550-2783-7-s1-p3
Numerical Analysis of Heavy Oil-Water Flow and Leak Detection in Vertical Pipeline  [PDF]
Jo?o Victor Nunes de Sousa, Cristiane Holanda Sodré, Antonio Gilson Barbosa de Lima, Severino Rodrigues de Farias Neto
Advances in Chemical Engineering and Science (ACES) , 2013, DOI: 10.4236/aces.2013.31002

Pipeline is a conventional, efficient and economic way for oil transportations. The use of a good system for detecting and locating leaks in pipeline contribute significantly to operational safety and cost saving in petroleum industry. This paper aims to study the heavy oil-water flow in vertical ducts including leakage. A transient numerical analysis, using the ANSYS-CFX? 11.0 commercial software is performed. The mathematical modeling considers the effect of drag and gravitational forces between the phases and turbulent flow. Mass flow rate of the phases in the leaking orifice, the pressure drop as a function of the time and the velocity distributions are presented and discussed. We can conclude that volumetric fraction of phases and fluid mixture velocity affect pressure drop and mass flow rate at the leak hole.

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