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Search Results: 1 - 10 of 7526 matches for " Luciano Bello;Ferraz "
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Effect of host-related factors on the intensity of liver fibrosis in patients with chronic hepatitis C virus infection
Costa Luciano Bello,Ferraz Maria Lucia Gomes,Perez Renata M.,Ferreira Adalgisa S.
Brazilian Journal of Infectious Diseases , 2002,
Abstract: There is increasing interest in the identification of factors associated with liver disease progression in patients infected with hepatitis C virus (HCV). We assessed host-related factors associated with a histologically advanced stage of this disease and determined the rate of liver fibrosis progression in HCV-infected patients. We included patients submitted to liver biopsy, who were anti-HCV and HCV RNA positive, who showed a parenteral risk factor (blood transfusion or intravenous drug use), and who gave information about alcohol consumption.Patients were divided into two groups for analysis: group 1 - grades 0 to 2; group 2 - grades 3 to 4. The groups were compared in terms of sex, age at the time of infection, estimated duration of infection and alcoholism. The rate of fibrosis progression (index of fibrosis) was determined based on the relationship between disease stage and duration of infection (years). Logistic regression analysis revealed that age at the time of infection (P<0.01; 95% CI 1.06-1.22) and the duration of infection (P<0.01; 95% CI 1.06-1.32) were independently associated with a more advanced stage of hepatitis C. The median index of fibrosis was 0.14 for the group as a whole. A significant difference in the index of fibrosis was observed between patients aged < 40 years at infection (median = 0.11) and patients aged > or = 40 years (median = 0.47). The main factors associated with a more rapid fibrosis progression were age at the time of infection and the estimated duration of infection. Patients who acquired HCV after 40 years of age showed a higher rate of fibrosis progression.
Effect of host-related factors on the intensity of liver fibrosis in patients with chronic hepatitis C virus infection
Costa, Luciano Bello;Ferraz, Maria Lucia Gomes;Perez, Renata M.;Ferreira, Adalgisa S.;Matos, Carla Adriana L.;Lanzoni, Valéria P.;Silva, Ant?nio Eduardo;
Brazilian Journal of Infectious Diseases , 2002, DOI: 10.1590/S1413-86702002000500002
Abstract: there is increasing interest in the identification of factors associated with liver disease progression in patients infected with hepatitis c virus (hcv). we assessed host-related factors associated with a histologically advanced stage of this disease and determined the rate of liver fibrosis progression in hcv-infected patients. we included patients submitted to liver biopsy, who were anti-hcv and hcv rna positive, who showed a parenteral risk factor (blood transfusion or intravenous drug use), and who gave information about alcohol consumption.patients were divided into two groups for analysis: group 1 - grades 0 to 2; group 2 - grades 3 to 4. the groups were compared in terms of sex, age at the time of infection, estimated duration of infection and alcoholism. the rate of fibrosis progression (index of fibrosis) was determined based on the relationship between disease stage and duration of infection (years). logistic regression analysis revealed that age at the time of infection (p<0.01; 95% ci 1.06-1.22) and the duration of infection (p<0.01; 95% ci 1.06-1.32) were independently associated with a more advanced stage of hepatitis c. the median index of fibrosis was 0.14 for the group as a whole. a significant difference in the index of fibrosis was observed between patients aged < 40 years at infection (median = 0.11) and patients aged 3 40 years (median = 0.47). the main factors associated with a more rapid fibrosis progression were age at the time of infection and the estimated duration of infection. patients who acquired hcv after 40 years of age showed a higher rate of fibrosis progression.
Estudio mineralógico, microtermométrico y aspectos estructurales de la mineralización de topacio imperial de Ant?nio Pereira, Distrito de Ouro Preto (Minas Gerais) - Brasil
Rojas, Arol Josue;Bello, Rosa Maria da Silveira;Endo, Issamu;Gandini, Antonio Luciano;
Rem: Revista Escola de Minas , 2009, DOI: 10.1590/S0370-44672009000100003
Abstract: the occurrences of imperial topaz in the antonio pereira mine, ouro preto, minas gerais, are associated with the metamorphic carbonate rocks of the minas supergroup. the crystals have densities varying from 3.46 to 3.58. the parameters of the unitary cells obtained were: 4.658 to 4.663? (ao), 8.823 to 8.832? (bo), 8.382 to 8.389? (co), and 344.65 to 345.46?3 (v). the refraction indices presented the following variations: 1.622 to 1.630 (nx), 1.624 to 1.632 (ny), 1.633 to 1.640 (nz), and 0.008 to 0.011 (b). these properties are coherent with the low fluorine contents obtained (16,48%/17,05wt%). infrared spectroscopy and microthermometry showed that the fluid inclusions, which represent the mineralizing fluids, are formed by h2o (with ca2+, mg2+ and na+), and co2 ± ch4. the minimal trapping t-p conditions of 290/320°c and 2,349/2,497bar were obtained for the primary fluid inclusions. the pseudo-secondary fluid inclusions were trapped at conditions of lower temperatures and variable pressures, during the deformation process under local alternating states of stress. the microthermometric studies, the structural analysis and the fluorine contents suggest that the mineralized veins were formed from hydrothermal fluids originated during the brasiliano tectono-metamorphic event.
Inje??o intravítrea de bevacizumab e gás C3F8 para tratamento da hemorragia submacular secundária a degenera??o macular relacionada à idade: relato de casos
Ferraz, Daniel Araújo;Bressanim, Gláucio Luciano;Morita, Celso;Takahashi, Walter Yukihiko;
Arquivos Brasileiros de Oftalmologia , 2010, DOI: 10.1590/S0004-27492010000100014
Abstract: the purpose of this case series is to describe if the intravitreal use of bevacizumab and perfluoropropane gas (c3f8) would be beneficial to the displacement of subretinal hemorrhage in patients with age-related macular degeneration (amd). a retrospective study of 5 eyes that received concurrent intravitreal injection of bevacizumab and c3f8 was performed. the results were graded according to blood displacement under the fovea, best final visual acuity and intraoperative complications. at the initial presentation, mean age of patients was 72.6 ± 8.9 years-old and duration of symptoms was 13 ± 9.7 days. from the 5 patients, 3 (60%) were male and 2 (40%) female. the success of submacular hemorrhage full displacement was achieved in 4 patients. the mean preoperative visual acuity (va) was 1.12 ± 0.34 logmar and the mean postoperative va was 0.92 ± 0.4 logmar. no cases of retinal detachment, endophthalmitis, vitreous hemorrhage, uveitis, cataracts and increased intraocular pressure were noted during the follow-up period. intravitreal bevacizumab and c3f8 injection, associated to prone position can be a valuable therapeutic option for eyes with neovascular age-related macular degeneration and subretinal hemorrhage to the blood displacement out of the foveal area.
Relationship between body mass and body length in capybaras (Hydrochoerus hydrochaeris)
Ferraz, Katia Maria Paschoaletto Micchi de Barros;Bonach, Kelly;Verdade, Luciano Martins;
Biota Neotropica , 2005, DOI: 10.1590/S1676-06032005000100020
Abstract: as a part of a management program we captured 39 capybaras (hydrochoerus hydrochaeris) in an agroecosystem at the east central region of the state of s?o paulo, brazil from march 2001 to may 2002. average adult male body mass was 54.1 ± 8.05 kg, and average adult female body mass was 62.0 ± 12.03 kg. average juvenile male body mass was 23.0 ± 8.28 kg, and average juvenile female body mass was 26.7 ± 5.86 kg. males and females presented a significant variation in the allometric relation between body mass and body length. body mass and body length had a high correlation for both adult males and adult females. these results from capybaras in agroecosystem might be relevant for further management programs.
Placenta??o em cutias (Dasyprocta aguti, CARLETON, M.D.): aspectos morfológicos
Rodrigues, Rosangela Felipe;Miglino, Maria Angelica;Ferraz, Rosa Helena dos Santos;Morais-Pinto, Luciano de;
Brazilian Journal of Veterinary Research and Animal Science , 2003, DOI: 10.1590/S1413-95962003000200007
Abstract: the agouti is a wild rodent found in the south of central america and in tropical regions of south america, especially in the northern, northeastern and southeastern regions of brazil. these animals represent an important socio-economic factor in the north and northeastern regions of brazil since they provide animal protein. for this paper 07 agouti (dasyprocta aguti) placentas were used, in differents stages of gestation. the placenta presents a spherical shape and lobular structure connecting to the uterus by means of a mesoplacenta. fetal blood flows from the interlobium to the center of the lobe, that is, centripetally, while maternal blood flows centrifugally.
Oxida??o de sulfetos de níquel com microorganismos mesófilos
Santos, Luciano Rodrigo Gomes;Barbosa, Alexandre Ferraz;Souza, Adelson Dias;Le?o, Versiane Albis;
Rem: Revista Escola de Minas , 2008, DOI: 10.1590/S0370-44672008000100008
Abstract: metallic sulphide oxidation has been associated to the generation of acid mine drainage, one of the most import environmental issues in the mining industry. bioleaching can be applied to accelerate sulphide oxidation, ceasing these impacts. this work sought to study the biooxidation of a complex nickel-iron sulphide (pentlandite and pyrrhotite) using acidophile iron-oxidizing bacteria. the effects of ph and solids concentration on the extraction of nickel were evaluated. a high nickel extraction (around 60%) can be achieved confirming the feasibility of nickel sulphide bioleaching. the ph has a negligible effect on nickel extraction being ph 2.0 the best value. nickel dissolution can be achieved at high solid percentages since gaseous transfer in the system is not strongly affected. it is suggested therefore that sulphide dissolution under these conditions is limited by the availability of carbon dioxide in the leaching system, which controls bacterial growth.
A Complex Networks Approach for Data Clustering
Francisco A. Rodrigues,Guilherme Ferraz de Arruda,Luciano da Fontoura Costa
Computer Science , 2011,
Abstract: Many methods have been developed for data clustering, such as k-means, expectation maximization and algorithms based on graph theory. In this latter case, graphs are generally constructed by taking into account the Euclidian distance as a similarity measure, and partitioned using spectral methods. However, these methods are not accurate when the clusters are not well separated. In addition, it is not possible to automatically determine the number of clusters. These limitations can be overcome by taking into account network community identification algorithms. In this work, we propose a methodology for data clustering based on complex networks theory. We compare different metrics for quantifying the similarity between objects and take into account three community finding techniques. This approach is applied to two real-world databases and to two sets of artificially generated data. By comparing our method with traditional clustering approaches, we verify that the proximity measures given by the Chebyshev and Manhattan distances are the most suitable metrics to quantify the similarity between objects. In addition, the community identification method based on the greedy optimization provides the smallest misclassification rates.
Minimal paths between communities induced by geographical networks
Henrique Ferraz de Arruda,Cesar Henrique Comin,Luciano da Fontoura Costa
Computer Science , 2015,
Abstract: In this work we investigate the betweenness centrality in geographical networks and its relationship with network communities. We show that vertices with large betweenness define what we call characteristic betweenness paths in both modeled and real-world geographical networks. We define a geographical network model that possess a simple topology while still being able to present such betweenness paths. Using this model, we show that such paths represent pathways between entry and exit points of highly connected regions, or communities, of geographical networks. By defining a new network, containing information about community adjacencies in the original network, we describe a means to characterize the mesoscale connectivity provided by such characteristic betweenness paths.
Diagnóstico confirmatorio de anticuerpos anti-Trypanosoma cruzi en donantes referidos por bancos de sangre en Venezuela A confirmatory diagnosis of antibodies anti-Trypanosoma cruzi in donors referred by blood banks in Venezuela
Zoraida Díaz-Bello,Reinaldo Zavala-Jaspe,María Díaz-Villalobos,Luciano Mauriello
Investigación Clínica , 2008,
Abstract: Con el objetivo de establecer el diagnóstico confirmatorio para Trypanosoma cruzi se realizaron al menos dos pruebas inmunoserológicas (ELISA, Reacción de Hemoaglutinación Indirecta, RHI, o Reacción de Fijación de Complemento, RFC) a donantes provenientes de bancos de sangre de centros asistenciales públicos y privados de Venezuela que acudieron durante 48 meses entre los a os 1997-1998 y 2003-2004 a la Sección de Inmunología del Instituto de Medicina Tropical en Caracas, Venezuela. Se evaluaron 254 donantes referidos de diferentes bancos de sangre por presentar anticuerpos anti-T. cruzi en pruebas de despistaje. Se confirmó la presencia de anticuerpos en 129/254 (50,79%) de los individuos por las técnicas de ELISA-IgG o RHI y RFC. El “xenodiagnóstico artificial” fue positivo en 10/118 (8,5%) personas con serología positiva. De 129 donantes encontrados reactivos por técnicas serológicas, 68 eran residentes de la región capital y 61 del interior del país. Así mismo, 113 nacieron en el interior del país, 8 en Caracas y 8 en Colombia. En 12 individuos confirmados serológicamente se constató la donación de sangre en mínimo 4 ocasiones antes de detectar la infección. El presente estudio resalta la importancia de la búsqueda activa de individuos con Enfermedad de Chagas a través de la detección de anticuerpos contra T. cruzi en la evaluación integral de donantes de sangre para descartar el riesgo de transmisión a otras personas. Muchos de estos donantes con anticuerpos anti-T. cruzi, la gran mayoría clínicamente asintomáticos, habían donado sangre en varias ocasiones previas al diagnóstico. To establish the confirmatory diagnosis of Trypanosoma cruzi infection, at least two immunoserological tests (ELISA, Indirect hamaglutination, IH, Complement Fixation Test, CFT) were carried out in 254 donors, from public and private blood banks of Venezuela, during 48 months between 1997-1998 and 2003-2004, referred to the Immunology Section of the Tropical Medicine Institute in Caracas. Antibodies anti-T. cruzi were detected in 129/254 (50,79%) by ELISA-IgG or IH and CFT. The “artificial xenodiagnosis” was positive in 10/118 persons with positive confirmed serology. Of 129 donors found positive by the serological tests, 68 were living in the capital region and 61 in the interior of the country. Likewise 113 were born in the interior of the country, 8 in Caracas and 8 in Colombia. Of them, 12 individuals serologically confirmed declared to have donated blood in a minimum of 4 occasions before diagnosis. The present study emphasizes the importance of detection of antibodie
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