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Search Results: 1 - 10 of 407958 matches for " Perez Renata M. "
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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.
Prevalência de estreptococos do grupo mutans em crian?as de 12 a 31 meses de idade e sua associa??o com a freqüência e severidade de cárie dental
MATTOS-GRANER, Renata de Oliveira;ZELANTE, Flávio;PEREZ, Regina Célia Santos Rocha;MAYER, Márcia Pinto Alves;
Revista de Odontologia da Universidade de S?o Paulo , 1998, DOI: 10.1590/S0103-06631998000400002
Abstract: the prevalence of mutans streptococci (ms) was evaluated in samples of unstimulated saliva from 142 12-31-month-old children. initial and manifest caries of all teeth surfaces were recorded. mutans streptococci were detected in 80.3% (n = 114) of the studied children, and 21.8% of all children (n = 31) presented high levels of these microorganisms. the salivary levels of mutans streptococci depended on the number of erupted teeth (c2 = 19.03; p < 0.001). there was a positive association between the number of caries affected children and the salivary levels of ms (c2 = 28.67; p < 0.001). in addition, there was a positive correlation between the salivary levels of these microorganisms and the number of caries lesions which was higher when initial caries were considered (r = 0.537; p < 0.001). these data show a high prevalence of mutans streptococci in children with 12 to 31 months of age and its positive association with the frequency and severity of dental caries.
Prevalência de estreptococos do grupo mutans em crian as de 12 a 31 meses de idade e sua associa o com a freqüência e severidade de cárie dental
MATTOS-GRANER Renata de Oliveira,ZELANTE Flávio,PEREZ Regina Célia Santos Rocha,MAYER Márcia Pinto Alves
Revista de Odontologia da Universidade de S?o Paulo , 1998,
Abstract: Avaliaram-se os níveis salivares de estreptococos do grupo mutans (GM) e a prevalência de cárie dental em 142 crian as, de 12 a 31 meses de idade, da cidade de Piracicaba - SP. Ao exame clínico, foram diagnosticadas as les es de cárie iniciais (mancha branca) e cavitadas de todas as superfícies dentárias. GM foram detectados em 80,3% (n = 114) das crian as estudadas, sendo que 21,8% (n = 31) delas apresentavam altos níveis salivares desses microrganismos. Os níveis salivares de GM foram dependentes do número de dentes irrompidos na cavidade bucal (c2 = 19,03; p < 0,001). Observou-se associa o positiva entre os níveis salivares desses microrganismos e o número de crian as com cárie dental (c2 = 28,67; p < 0,001). Além disso, observou-se uma correla o positiva entre os níveis de GM na saliva e o número de les es diagnosticadas, sendo maior o coeficiente de correla o quando as les es iniciais foram consideradas (r = 0,537; p < 0,001). Os dados mostram uma alta prevalência de GM em crian as com 12 a 31 meses de idade e sua associa o positiva com a freqüência e severidade da cárie dental.
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.
Is autoimmune hepatitis a frequent finding among HCV patients with intense interface hepatitis?
Rosilene G Badiani, Vitória Becker, Renata M Perez, Carla AL Matos, Lara B Lemos, Valéria P Lanzoni, Luis Eduardo C Andrade, Alessandra Dellavance, Antonio Eduardo B Silva, Maria Lucia G Ferraz
World Journal of Gastroenterology , 2010,
Abstract: AIM: To evaluate the overlap of autoimmune hepatitis in hepatitis C virus (HCV)-infected patients with intense interface hepatitis.METHODS: Among 1759 patients with hepatitis C submitted to liver biopsy, 92 (5.2%) presented intense interface hepatitis. These patients were evaluated regarding the presence of antinuclear antibody (ANA), anti-smooth muscle antibody (SMA) and anti-liver/kidney microsomal antibody (LKM-1), levels of γ-globulin and histological findings related to autoimmune hepatitis (plasma cell infiltrate and presence of rosettes).RESULTS: Among patients with hepatitis C and intense interface hepatitis there was a low prevalence of autoantibodies (ANA = 12%, SMA = 5%, LKM-1 = 0%) and the median γ-globulin level was within the normal range. Typical histological findings of autoimmune disease were observed in only two cases (2%). After applying the score for diagnosis of autoimmune hepatitis, only one patient was classified with a definitive diagnosis of autoimmune hepatitis. Since overlap with autoimmune hepatitis was not the explanation for the intense necroinflammatory activity in patients with chronic hepatitis C we sought to identify the variables associated with this finding. The presence of intense interface hepatitis was associated with more advanced age, both at the time of infection and at the time of the biopsy, and higher prevalence of blood transfusion and alcohol abuse.CONCLUSION: Although possible, overlap with autoimmune hepatitis is a very rare association in HCV-infected patients with intense interface hepatitis, an unusual presentation which seems to be related to other host variables.
Relativistic Wigner Function Approach to Neutrino Propagation in Matter
M. Sirera,A. Perez
Physics , 1998, DOI: 10.1103/PhysRevD.59.125011
Abstract: In this work we study the propagation of massive Dirac neutrinos in matter with flavor mixing, using statistical techniques based on Relativistic Wigner Functions. First, we consider neutrinos in equilibrium within the Hartree approximation, and obtain the corresponding relativistic dispersion relations and effective masses. After this, we analyze the same system out of equilibrium. We verify that, under the appropiate physical conditions, the well known equations for the MSW effect are recovered. The techniques we used here appear as an alternative to describe neutrino properties and transport equations in a consistent way.
Constrained Differential Renormalization of Yang-Mills Theories
M. Perez-Victoria
Physics , 1998, DOI: 10.1016/S0370-2693(98)01217-9
Abstract: We renormalize QCD to one loop in coordinate space using constrained differential renormalization, and show explicitly that the Slavnov-Taylor identities are preserved by this method.
Exact calculation of the radiatively-induced Lorentz and CPT violation in QED
M. Perez-Victoria
Physics , 1999, DOI: 10.1103/PhysRevLett.83.2518
Abstract: Radiative corrections arising from the axial coupling of charged fermions to a constant vector b_\mu can induce a Lorentz- and CPT-violating Chern-Simons term in the QED action. We calculate the exact one-loop correction to this term keeping the full b_\mu dependence, and show that in the physically interesting cases it coincides with the lowest-order result. The effect of regularization and renormalization and the implications of the result are briefly discussed.
Solving the Nose-Hoover thermostat for Nuclear Pasta
M. Angeles Perez Garcia
Physics , 2006, DOI: 10.1063/1.2218236
Abstract: In this work we present a calculation of the hamiltonian variables solving the molecular dynamics equations of motion for a system of nuclear matter relevant to the description of nuclear pasta. The temperature is kept fixed by using the Nos\'{e}-Hoover Thermostat and the interaction is modelled via a semiclassical potential depending on both positions and momenta.
Right ideals in non-associative universal enveloping algebras of Lie triple systems
J. M. Perez Izquierdo
Mathematics , 2006,
Abstract: We prove that the only proper right ideal of the universal enveloping algebra of a finite-dimensional central simple Lie triple system over a field of characteristic zero is its augmentation ideal.
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