Time filter

Source Type

Catalao, Brazil

The Universidade Federal de Goiás is a publicly funded university located in the Brazilian state of Goiás, headed in Goiânia and with campuses in the municipalities of Catalão, City of Goiás, and Jataí.Founded on December 14, 1960, after the merger of previously existing colleges, UFG is the only federally funded institution of higher education in the state, the richest and most populous in the Central-West Region of Brazil. The activities of the university involves 28,899 students in 150 undergraduate courses.According to the National Institute of Studies and Research on Education, linked to the Ministry of Education, UFG is the second best university in the Central-West Region, behind only University of Brasília. Wikipedia.

Ponde R.A.A.,Federal University of Goais
European Journal of Clinical Microbiology and Infectious Diseases | Year: 2013

During hepatitis B virus (HBV) infection, at least four antigen-antibody systems are observed: HBsAg and anti-HBs; preS antigen and anti-preS antibody; HBcAg and anti-HBc; and HBeAg and anti-HBe. Through the examination of these antigen-antibody systems, hepatitis B infection is diagnosed and the course of the disorder may be observed. Although the serologic findings that allow both the diagnosis of HBV infection as well as assessing of its clinical course are already well established, the dynamics of viral proteins expression and of the antibodies production may vary during the infection natural course. This causes the HBV infection to be occasionally associated with the presence of uncommon serological profiles, which could lead to doubts in the interpretation of results or suspicion of a serological result being incorrect. This paper is dedicated to the discussion of some of these profiles and their significance. © 2012 Springer-Verlag Berlin Heidelberg. Source

Brito D.,Federal University of Goais
Basic and Applied Ecology | Year: 2010

Knowledge of biodiversity is woefully inadequate. Only a fraction of the planet's species has been described by science (the " Linnean shortfall" ). Even for described species, scientists often have only fragmentary information about their distributions (the " Wallacean" shortfall). These shortfalls in biodiversity knowledge place serious limitations on the ability to conserve biodiversity in the face of the ongoing extinction crisis. Here, I test the hypothesis that data deficiency may be used to guide surveys and inventories to regions that would increase the probability of discovering new species. I compiled global distribution maps for all Data Deficient amphibian species (species described up to 2004) and constructed a Data Deficiency (DD) surface (the DD surface was based on distribution information obtained from the IUCN Red List). Then, I compared the type-locality sites of new amphibian species descriptions (species described between 2005 and 2009) with the DD surface in order to check if new species discoveries were significantly more abundant within the DD surface or not. Even though the amphibian DD species surface covers only 8% of Earth's land area, 79% of the amphibian species discovered between 2005 and 2009 were within the DD surface. The results suggest that directing surveys towards areas of known data deficiency will likely result in the discovery of species new to science, helping to address the Linnean shortfall. Incorporating DD information from the IUCN Red List may provide an efficient methodology for strategically targeting surveys and inventories, maximizing the chances of obtaining high conservation benefits from them, and helping minimize the costs associated with such endeavours. © 2010. Source

Ponde R.A.D.A.,Federal University of Goais
Medical Microbiology and Immunology | Year: 2011

Hepatitis C virus infection is a global health problem that has important epidemiological and clinical consequences. It has been well established that exposure to infected blood is the main risk factor for HCV transmission. However, in 20% of cases the agent transmission occurs by unknown route or in the presence of an unidentified source of infection. Understanding of the epidemiology of HCV is needed to help us define future control and preventive strategies. Herein, we discuss about diagnosis of HCV infection and hepatitis C surveillance in the context of its transmission. © 2010 Springer-Verlag. Source

Soares R.M.,Federal University of Goais
Journal of Sound and Vibration | Year: 2014

An analysis of the linear and nonlinear vibration response and stability of a pre-stretched hyperelastic rectangular membrane under harmonic lateral pressure and finite initial deformations is presented in this paper. Geometric nonlinearity due to finite deformations and material nonlinearity associated with the hyperelastic constitutive law are taken into account. The membrane is assumed to be made of an isotropic, homogeneous, and incompressible Mooney-Rivlin material. The results for a neo-Hookean material are obtained as a particular case and a comparison of these two constitutive models is carried out. First, the exact solution of the membrane under a biaxial stretch is obtained, being this initial stress state responsible for the membrane stiffness. The equations of motion of the pre-stretched membrane are then derived. From the linearized equations, the natural frequencies and mode shapes of the membrane are analytically obtained for both materials. The natural modes are then used to approximate the nonlinear deformation field using the Galerkin method. A detailed parametric analysis shows the strong influence of the stretching ratios and material parameters on the linear and nonlinear oscillations of the membrane. Frequency-amplitude relations, resonance curves, and bifurcation diagrams, are used to illustrate the nonlinear dynamics of the membrane. The present results are compared favorably with the results evaluated for the same membrane using a nonlinear finite element formulation. © 2014 Elsevier Ltd. Source

Many believe that the regular treatment for multibacillary (MB) leprosy cases could be shortened. A shorter treatment, allowing for uniform treatment for all cases, makes case classification superfluous and therefore simplifies leprosy control. To evaluate the association of the treatment duration with the frequency of reactions among MB patients. An open-label randomised clinical trial to compare the present routine treatment with one lasting six months. Patients were recruited between March 2007 and February 2012. We analysed the frequency of first reaction with the Kaplan-Meier method and of recurrent reaction with a Poisson regression, using the treatment group and baciloscopic index level (BI) as independent variables. Logistic regression was used to evaluate the statistical association of different reaction types and the treatment group. Among those with BI < 3, we found a statistical significant difference of reaction frequencies between the treatment groups from 6 to 18 months since the beginning of treatment. This difference disappears at 2 years after the start of treatment. Multiple reactions were associated with the treatment group and with BI > or = 3. No specific types of reactions were associated with treatment duration. Although this is the first report of U-MDT/CT-BR, the results presented here support the possibility of use of UMDT in the field. Source

Discover hidden collaborations