Fontenele A.M.,Federal University of Maranhao
Annals of hepatology | Year: 2013
The hepatitis B virus (HBV) is one of the most frequently transmitted agents in dialysis units. Occult hepatitis B is characterized by HBV infection without detectable surface antigen (HBsAg) in the patient's serum, a positive or negative HBV DNA marker result in the serum and a positive result in the liver tissue, which leads to the potential risk of transmission during renal replacement therapy service. There is variation in occult hepatitis B prevalence rates in this population across various studies that may be related to numerous factors. The presence of occult hepatitis B in individuals undergoing renal replacement therapy is important with regard to both the possibility of transmission and the consequences for the patient, especially the development of chronic liver disease and reactivation of the disease after renal transplantation.
Barros A.K.,Federal University of Maranhao
Annals of Physics | Year: 2015
The results of the Young experiment can be analyzed either by classical or Quantum Physics. The later one though leads to a more complete interpretation, based on two different patterns that appear when one works either with single or double slits. Here we show that the two patterns can be derived from a single principle, in the context of General Relativity, if one assumes an additional spatial dimension to the four known today. The found equations yield the same results as those in Quantum Mechanics. © 2015 Elsevier Inc.
[Prevalence and factors associated with abdominal obesity and excess weight among adults from Maranhão, Brazil]. [Prevalência e fatores associados à obesidade abdominal e ao excesso de peso em adultos maranhenses.]
Veloso H.J.,Federal University of Maranhao
Revista brasileira de epidemiologia = Brazilian journal of epidemiology | Year: 2010
To determine the prevalence of excess body weight and abdominal obesity and assess the association with socioeconomic, demographic and behavioral factors among adults of Maranhão, Brazil. Multistage cluster sample investigated through a household survey on 1,005 adults aged 20 to 59 years (393 men and 612 women). Anthropometric measures: weight, height and waist circumference (WC) were assessed. Abdominal obesity was defined as WC > 80 for women and WC > 94 for men. Body mass index (BMI), weight in kilograms divided by the square of height in meters, > 25 kg/m2 was considered excess body weight. The dependent variable was divided into four categories: normal BMI and WC, excess body weight only (EBW), abdominal obesity only (AO) and abdominal obesity with excess body weight (AOEBW). Multinomial logistic regression was used for statistical analysis and estimates took the complex sampling design into account. Among men the prevalence of AO was 1.3%, EBW 20.3% and AOEBW 27.5%. Among women 15.5% presented AO, 1.3% EBW and 42.0% AOEBW. There was a significant statistical difference among sexes (p value < 0.001). In the multivariable analysis, among men, schooling > 9 years and living with a partner were factors associated with higher prevalence of EBW. Age > 35 years, family income > two minimum wages and living with a partner were associated with higher prevalence of AOEBW. Among women, age > 35 and living with a partner were factors associated with AO. Age > 35 years, living with a partner and schooling < 9 years were associated with a higher prevalence of AOEBW. the prevalence of EBW was higher among men whereas AO prevailed among women. Factors associated with excess body weight, abdominal obesity and both excess body weight and abdominal obesity varied.
Sourrouille L.,Federal University of Maranhao
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013
We consider a generalization of an Abelian Chern-Simons-Higgs model by introducing a nonstandard kinetic term. In particular, we show that the Bogomol'nyi equations of the Abelian Higgs theory may be obtained, with their solutions being Nielsen-Olesen vortices with electric charge. In addition, we study the self-duality equations for a generalized nonrelativistic Maxwell-Chern-Simons model. © 2013 American Physical Society.
Dias C.N.,Federal University of Paraiba |
Moraes D.F.C.,Federal University of Maranhao
Parasitology Research | Year: 2014
This review aims to describe essential oils and their constituent compounds that exhibit bioactivity against Aedes aegypti L. (Diptera: Culicidae) larvae, the immature stage of the primary vector of dengue. This review is based on original articles obtained by searching on major databases. Our literature review revealed that 361 essential oils from 269 plant species have been tested for their larvicidal activity. More than 60 % of these essential oils were considered active (LC50 < 100 mg/L), and the majority of these active oils were derived from species belonging to Myrtaceae, Lamiaceae, and Rutaceae. The most active essential oils exhibited effective concentrations comparable with the dosage recommended for the use of temephos in container breeding. Approximately 27 % of the plants studied for their larvicidal activity against A. aegypti were collected in Brazil. Essential oils rich in phenylpropanoids, oxygenated sesquiterpenes, and monoterpene hydrocarbons were found to be the most active. When the isolates were tested, phenylpropanoids and monoterpene hydrocarbons were the most active compound classes. We describe the plant parts used and the major constituents of the essential oils. In addition, we discuss factors affecting the activity (such as plant parts, age of the plant, chemotypes, larval source, and methods used), structure-activity relationships, and mechanisms of action of the essential oils and their compounds. Essential oils have been widely investigated and show high larvicidal activity against A. aegypti. This review reveals that the essential oils are effective alternatives for the production of larvicides, which can be used in vector-borne disease control programmes. © 2013 Springer-Verlag Berlin Heidelberg.