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Search Results: 1 - 10 of 601920 matches for " Silva R.M. da "
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A broncofibroscopia no diagnóstico etiológico de afec??es pulmonares em pacientes com síndrome da imunodeficiência adquirida
Silva, R.M. da;Chterpensque, A.;
Revista da Associa??o Médica Brasileira , 2000, DOI: 10.1590/S0104-42302000000200012
Abstract: purpose: to evaluate the role of bronchoscopy in diagnosis of pulmonary disease in acquired immunodeficiency syndrome. methods: this study analyses a group of 49 patients with aids diagnosis admitted at nereu ramos hospital - florianópolis - sc. it was selected patients with respiratory simptoms and radiologic signs of pulmonary disease, without etiological diagnosis by sputum analysis. these patients were submitted to bronchoscopy with bronchoalveolar lavage, bronchial brush and transbronchial biopsy. the samples were analyzed by baar, cytomegalovirus, p. carinii, other fungus and bacterioscopy by gram. results: the bronchoscopy was effective on the realization of etiological diagnosis of 71,43% of the cases. the transbronchial biopsy was the most positive technique which confirmed the diagnosis of 59,18% of the cases. the technique with the least positivity was the bronchial brush, with a diagnosis of 4,08% of the cases. the most frequent etiological agent was p. carinii (42,8%), followed by m. tuberculosis (22,86%). no complication was observed in the procedures making. conclusion: the conclusion of this present study was that the bronchoscopy is a secure procedure, with good diagnosis performance for pulmonary disease in this group of patients.
A broncofibroscopia no diagnóstico etiológico de afec es pulmonares em pacientes com síndrome da imunodeficiência adquirida
Silva R.M. da,Chterpensque A.
Revista da Associa??o Médica Brasileira , 2000,
Abstract: OBJETIVO: Avaliar o papel da broncofibroscopia no diagnóstico etiológico de pneumopatias em pacientes positivos ao vírus da imunodeficência humana. MéTODOS: O presente estudo analisa um grupo de 49 pacientes com diagnóstico de síndrome da imunodeficiência adquirida, admitidos no Hospital Nereu Ramos - Florianópolis -SC. Foram selecionados pacientes sintomáticos respiratórios com les o simples ao exame radiográfico do tórax, sem diagnóstico etiológico confirmado por exame de escarro. Tais pacientes foram submetidos à broncofibroscopia com realiza o de lavado broncoalveolar, escovado br nquico e biópsia pulmonar transbr nquica. As amostras foram analisados com bacterioscopia pelo Gram, pesquisa de BAAR, citomegalovírus, P. carinii e outros fungos. RESULTADOS: A broncofibroscopia foi efetiva na realiza o do diagnóstico etiológico em 71,43% dos casos. A biópsia pulmonar transbr nquica foi a técnica com maior positividade, firmando o diagnóstico em 59,18% dos casos. A técnica com menor positividade foi o escovado br nquico, com diagnóstico em 4,08% dos casos. O agente etiológico mais freqüente foi o P. carinii (42,8%), seguido pelo M. tuberculosis (22,86%). Nenhuma complica o foi observada nos procedimentos realizados. CONCLUS O: Concluímos no presente estudo que neste grupo de pacientes a broncofibroscopia foi um procedimento seguro e efetivo para o diagnóstico etiológico de afec es pulmonares.
Temperature dependence of the absorption coefficient in doped quantum wells
Baldan, M.R.;Serra, R.M.;Emmel, P.D.;Silva, A. Ferreira da;
Brazilian Journal of Physics , 1999, DOI: 10.1590/S0103-97331999000400021
Abstract: in this work we present a calculation of the infrared optical absorption coefficient for a ga1-xalxas quantum well (qw) as a function of donor impurity concentration, compensation and temperature. we treat this problem using a self-consistent method (sc) calculation taking into account donors as major impurities. the variational method was used to obtain the ground state wave-function of an electron bound to a donor impurity in a qw. the results show a shift of energy in the absorption coefficient.
Temperature dependence of the absorption coefficient in doped quantum wells
Baldan M.R.,Serra R.M.,Emmel P.D.,Silva A. Ferreira da
Brazilian Journal of Physics , 1999,
Abstract: In this work we present a calculation of the infrared optical absorption coefficient for a Ga1-xAl xAs quantum well (QW) as a function of donor impurity concentration, compensation and temperature. We treat this problem using a Self-Consistent Method (SC) calculation taking into account donors as major impurities. The Variational Method was used to obtain the ground state wave-function of an electron bound to a donor impurity in a QW. The results show a shift of energy in the absorption coefficient.
Propane oxidation on Pt-WO3/gamma -AL2O3 catalytic systems
Silva, M.A.Pereira da;Cardoso, R.M.;Schmal, M.;
Brazilian Journal of Chemical Engineering , 2003, DOI: 10.1590/S0104-66322003000100010
Abstract: the oxidation of propane on was studied with pt-xwo3/al2o3 catalysts was studied ,by varying the concentration of tungsten sublayer. thermal analysis and xrd in situ showed that the enrichment of tungsten at the surface is associated with the formation of hxwo3 bronze. ftir results with c3h8 and o2 indicated that the catalyst surface properties and the interaction between w and pt were modified. these modified surface complexes prevented the formation of acetates and formate species. the addition of w increased the activity of pt/al2o3 towards in c3h8 oxidation. tungsten was the main responsible for the stability of the bimetallic catalysts in the presence of water.
The use of polymerase chain reaction for early diagnosis of tuberculosis in Mycobacterium tuberculosis culture
Chagas, M.;Silva, R.M. da;Bazzo, M.L.;Santos, J.I. dos;
Brazilian Journal of Medical and Biological Research , 2010, DOI: 10.1590/S0100-879X2010007500031
Abstract: early diagnosis plays a vital role in controlling tuberculosis. the conventional methodology is slow, with results taking several weeks, in addition to having low sensitivity, especially in clinical paucibacillary samples. the objective of this study was to evaluate the use of polymerase chain reaction (pcr) on solid medium culture for a rapid diagnosis of tuberculosis, mainly in cases of negative sputum smears. forty sputum samples were collected from inpatients with tuberculosis treated for less than 2 days. bacilloscopy, pcr for sputum, culture on l?westein-jensen (lj) solid medium, and daily pcr from culture were performed on each sample. dna extracted from the bcg vaccine, which contains attenuated bacillus calmette-guérin, was used as the positive control. smear microscopy showed 68.6% sensitivity, 80% specificity, 96% positive predictive value, and 26.7% negative predictive value, with culture on lj medium as the gold standard. culture at day 28 showed 74.3% sensitivity and 100% specificity. pcr of dna extracted from sputum amplified a 1027-bp fragment of the 16s rna gene, showing 22.9% sensitivity and 60% specificity. pcr performed with dna extracted from daily culture showed that, from the 17th to the 40th day, the sensitivity (85.7%) and specificity (60%) were constant. we conclude that a 17-day culture is a good choice for rapid diagnosis and to interfere with the transmission chain of tuberculosis.
Propane oxidation on Pt-WO3/g -AL2O3 catalytic systems
Silva M.A.Pereira da,Cardoso R.M.,Schmal M.
Brazilian Journal of Chemical Engineering , 2003,
Abstract: The oxidation of propane on was studied with Pt-xWO3/Al2O3 catalysts was studied ,by varying the concentration of tungsten sublayer. Thermal analysis and XRD in situ showed that the enrichment of tungsten at the surface is associated with the formation of HxWO3 bronze. FTIR results with C3H8 and O2 indicated that the catalyst surface properties and the interaction between W and Pt were modified. These modified surface complexes prevented the formation of acetates and formate species. The addition of W increased the activity of Pt/Al2O3 towards in C3H8 oxidation. Tungsten was the main responsible for the stability of the bimetallic catalysts in the presence of water.
Hepatitis C virus seroprevalence and genotypes in patients with diffuse connective tissue diseases and spondyloarthropathies
Barbosa, V.S.;Silva, N.A. da;Martins, R.M.B.;
Brazilian Journal of Medical and Biological Research , 2005, DOI: 10.1590/S0100-879X2005000500020
Abstract: many extrahepatic manifestations, including rheumatic diseases, have been reported to be associated with hepatitis c virus (hcv) infection. in order to investigate the prevalence of hcv infection among patients with rheumatic diseases, in the present study we interviewed 367 patients and tested their blood samples for hcv antibodies (anti-hcv) by an enzyme-linked immunosorbent assay. anti-hcv-reactive samples were retested for confirmation by a line immunoassay and also for hcv rna detection by the polymerase chain reaction. hcv rna-positive samples were genotyped by inno-lipa. an overall hcv infection prevalence of 1.9% (7/367) was found. of the 7 hcv-infected patients, 4 had systemic lupus erythematosus and 3 rheumatoid arthritis, resulting in positivity rates of 2.3 and 3.4%, respectively. hcv rna genotyping revealed the presence of subtypes 1a (57.1%), 1b (28.6%) and 3a (14.3%). the clinical course was favorable for all hcv-infected patients, except one, who died due to renal insufficiency related to lupus nephritis. these results demonstrate a low hcv infection prevalence among the population studied. in the few positive cases, we observed no adverse influence of this infection on the clinical evolution of the rheumatic disease.
Hepatitis C virus seroprevalence and genotypes in patients with diffuse connective tissue diseases and spondyloarthropathies
Barbosa V.S.,Silva N.A. da,Martins R.M.B.
Brazilian Journal of Medical and Biological Research , 2005,
Abstract: Many extrahepatic manifestations, including rheumatic diseases, have been reported to be associated with hepatitis C virus (HCV) infection. In order to investigate the prevalence of HCV infection among patients with rheumatic diseases, in the present study we interviewed 367 patients and tested their blood samples for HCV antibodies (anti-HCV) by an enzyme-linked immunosorbent assay. Anti-HCV-reactive samples were retested for confirmation by a line immunoassay and also for HCV RNA detection by the polymerase chain reaction. HCV RNA-positive samples were genotyped by INNO-LIPA. An overall HCV infection prevalence of 1.9% (7/367) was found. Of the 7 HCV-infected patients, 4 had systemic lupus erythematosus and 3 rheumatoid arthritis, resulting in positivity rates of 2.3 and 3.4%, respectively. HCV RNA genotyping revealed the presence of subtypes 1a (57.1%), 1b (28.6%) and 3a (14.3%). The clinical course was favorable for all HCV-infected patients, except one, who died due to renal insufficiency related to lupus nephritis. These results demonstrate a low HCV infection prevalence among the population studied. In the few positive cases, we observed no adverse influence of this infection on the clinical evolution of the rheumatic disease.
Nonlinear dynamics time series analysis of chaotic current oscillations in a semi-insulating GaAs sample
Silva, R.L. da;Rubinger, R.M.;Oliveira, A.G. de;Ribeiro, G.M.;
Brazilian Journal of Physics , 2002, DOI: 10.1590/S0103-97332002000200047
Abstract: we have carried out our experiments on a semi-insulating gaas sample grown by low temperature molecular beam epitaxy. three parameters were used to fine tune the experiments, namely, temperature, illumination, and applied bias. we have used powerful tools of time series analysis in order to assess the embedding dimension through near false nearest neighbors. we have also measured the maximum lyapunov exponent and the correlation dimension [1]. the main contribution was in presenting new experimental data and its analysis which presents self-generated chaos.
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