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Sincelejo, Colombia

The Universidad de Sucre is a public, departmental, coeducational university located in Sincelejo, Sucre, Colombia. The university has three campus in the city. The main one, known as the Puerta Roja is the home for most of the faculties and has the largest student population. The second and smaller campus, known as Puerta Blanca, is home to the Faculty of Health science and its near the University Hospital of Sincelejo. The third campus, known as Puerta Verde or the Granja Pericos is home to the Faculty of Agronomy science and is in the outskirts of the city. The university offers education at undergraduate and postgraduate levels, with 16 academic programs across its five faculties. Wikipedia.

Musca domestica or "housefly" is a cosmopolitan specie that represents a public health threat in the urban areas with a deficient sanitary management. As a polyphagous specie, it is attracted to different substrates to feed: food, waste, secretions, feces, among others. M. domestica is an efficient mechanical vector of protozoan cysts, helminthoid eggs, bacteria, viruses and fungi. Between April and May 2012, outbreaks of houseflies were recorded from the Sanitary Landfill in the neighborhood of sector El Peñón of Cumana City, Sucre State, Venezuela, directly affecting the entire community and the school Unidad Educativa Nueva Toledo, forcing the suspension of classes to the 2,140 children studying there. Because of this episode, the present study was proposed in order to identify bacterial and parasitic agents that could be carried by adult M. domestica collected in the affected area. The presence of bacteria and enteropathogenic parasites was demonstrated in M. domestica. Nine species of bacteria were isolated belonging to the family Enterobacteriaceae: Escherichia coli, Enterobacter aerogenes, E. cloacae, Proteus mirabilis, P. vulgaris, Salmonella spp., Shigella spp., Klebsiella pneumoniae and Serratia spp. Seven species of enteroparasites with public health relevance were found: Blastocystis spp., Entamoeba coli, Giardia intestinalis, Endolimax nana, Cyclospora cayetanensis, Toxocara spp. and Entamoeba histolytica. This study is a contribution to the description of the role of M. domestica as both mechanical and biological vector of pathogenic parasites and bacteria for humans, and represents an important knowledge due to the high prevalence in Venezuela of the diarrheic diseases they originate. Furthermore, it represents the first research made in Cumana in this field of study. Source

Velez-Liendo X.,University of Sucre | Strubbe D.,University of Antwerp | Matthysen E.,University of Antwerp
Ursus | Year: 2013

Species distribution models are used in ecology and conservation biology to draw inferences about the drivers of species' ranges. However, poor conceptual background, environmental variable selection, and algorithm selection can contribute to misleading model predictions. We assessed the effects of environment variable selection and compared statistical performance and output maps of correlative resource- and biotope-based models for estimating the habitat and potential distribution of the Andean bear (Tremarctos ornatus) in Bolivia's Tropical Andes. The resource-based approach estimated bear habitat using 7 resources associated with 3 ecological functions: feeding, shelter, and access to water. In contrast, the biotope model described the habitat by applying 11 environmental predictors related to topography, vegetation, and human activities. Both models performed equally well overall and better than random, with shelter as the most influential variable for the resource model and Yunga forest for the biotope model. However, discrepancies in the extent and arrangement of predicted bear distribution between models differed and emphasized the effect of variable selection, which could influence the delineation of conservation areas for this species. We suggest using a resource-based approach when modelling species distribution because of the more direct relationship to the species investigated and greater ease of interpreting results. Source

Bejarano E.E.,University of Sucre | Vivero R.J.,University of Antioquia | Uribe S.,National University of Colombia
Memorias do Instituto Oswaldo Cruz | Year: 2010

The phlebotomine sand fly Lutzomyia velezi sp.nov. was described and illustrated from male specimens collected by light trap in the Reserva Natural Cañon del Río Claro in the Central Cordillera of the Colombian Andes. The new species belongs to the series sanguinaria of the subgenus Helcocyrtomyia, which is represented in Colombia by Lutzomyia cirrita, Lutzomyia hartmanni, Lutzomyia sanguinaria, Lutzomyia scorzai, Lutzomyia sp. of Pichindé and Lutzomyia tortura. The new species can be differentiated from others of the subgenus by the combination of the following characteristics: long antennal ascoids, reaching level of the papilla, coxite with a single basal seta and fifth palpomere longer than or equal to the sum of the lengths of the third and fourth palpomeres. Source

Villamil P.,University of Sucre
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2010

In this paper we present a calculation of the binding energy of a donor impurity in a cylindrical GaAs-Ga0.6Al0.4As quantum well wire (QWW) as a function of an applied magnetic field for different wire radii and different positions of the donor. The model considers an infinite length QWW with a carrier that is confined laterally by a parabolic potential and the presence of a uniform magnetic field applied parallel to the wire axis. The 1s-like impurity state is considered using the effective-mass approximation within the variational approach. We found that for a given wire radius the binding energy of the impurity increases with the magnetic field and that for a given magnetic field value it decreases with wire radius. Our results are in good agreement with previous theoretical reports. © 2010 Elsevier B.V. Source

Rosales L.,University of Sucre | Barreto W.,University of the Balearic Islands | Barreto W.,University of Los Andes, Venezuela | Peralta C.,German Weather Service | And 2 more authors.
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

We apply the postquasistatic approximation, an iterative method for the evolution of self-gravitating spheres of matter, to study the evolution of dissipative and electrically charged distributions in general relativity. The numerical implementation of our approach leads to a solver which is globally second-order convergent. We evolve nonadiabatic distributions assuming an equation of state that accounts for the anisotropy induced by the electric charge. Dissipation is described by streaming-out or diffusion approximations. We match the interior solution, in noncomoving coordinates, with the Vaidya-Reissner-Nordström exterior solution. Two models are considered: (i) a Schwarzschild-like shell in the diffusion limit; and (ii) a Schwarzschild-like interior in the free-streaming limit. These toy models tell us something about the nature of the dissipative and electrically charged collapse. Diffusion stabilizes the gravitational collapse producing a spherical shell whose contraction is halted in a short characteristic hydrodynamic time. The streaming-out radiation provides a more efficient mechanism for emission of energy, redistributing the electric charge on the whole sphere, while the distribution collapses indefinitely with a longer hydrodynamic time scale. © 2010 The American Physical Society. Source

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