Time filter

Source Type

Barquisimeto, Venezuela

The Universidad Centroccidental Lisandro Alvarado is a public university of Venezuela located in Barquisimeto. It was founded in 1962 with the creation of the Centro Experimental de Estudios Superiores , and became the Universidad de la Región Centro Occidental in 1967, before being given its current name in 1979. Wikipedia.

Vasquez C.,University of Sao Paulo | Vasquez C.,University Centroccidental Lisandro Alvarado | de Moraes G.J.,University of Sao Paulo
Experimental and Applied Acarology | Year: 2013

The red palm mite (RPM), Raoiella indica Hirst (Acari: Tenuipalpidae), is an invasive pest in the New World, where it is currently considered a serious threat to coconut and banana crops. It was first reported from northern Venezuela in 2007. To determine its current distribution in this country, surveys were carried out from October 2008 to April 2010 on coconut (Cocos nucifera L.), banana (Musa spp.), ornamental plants and weeds in northern Venezuela. Higher population levels of RPM were registered on commercial coconut farms in Falcón and Sucre states but also on other plant species naturally growing along the coastal line in Anzoategui, Aragua, Carabobo, Monagas and Nueva Esparta states. Out of 34 botanical species evaluated, all RPM stages were observed only on eight arecaceous, one musaceous and one streliziaceous species, indicating that the pest developed and reproduced only on these plants. Mite specimens found on weeds were considered spurious events, as immature stages of the pest were never found on these. Amblyseius largoensis (Muma) (Acari: Phytoseiidae) was the most frequent predatory mite associated with RPM in all sampling sites. The results indicate that RPM has spread to extensive areas of northern Venezuela since its initial detection in Güiria, Sucre state. Considering the report of this pest mite in northern Brazil in the late 2009, additional samplings in southern Venezuela should be carried out, to evaluate the possible presence of RPM also in that region. © 2012 Springer Science+Business Media Dordrecht.

Chiurillo M.A.,University Centroccidental Lisandro Alvarado
Drug Metabolism and Personalized Therapy | Year: 2015

Pharmacogenetics is being applied to develop individual specific therapies considering different ethnic groups and mixed populations. The Venezuelan population is very heterogeneous as a result of the admixture process that occurred between Native Americans, Europeans, and Africans through five centuries. This review provides a summary of the literature concerning gene variants within drug-metabolizing enzymes, drug targets, and drug receptors (CYP2C19, CYP2D6, GSTM1, GSTT1, GSTP1, NAT2, MTHFR, LEP, LEPR, LTC4S, and ADRβ2 genes) evaluated in the Venezuelan population. In particular, most of the studies were conducted with relatively low numbers of individuals. Some of these studies included analyses of genetic polymorphisms in native groups living in this country. Although the recent studies represent a hopeful progress toward the inclusion of the Venezuelan population among those who will benefit from the implementation of pharmacogenetic principles and tools in drug therapy, there are not yet sufficient data concerning allelic frequencies of genomic biomarkers related to drug response for their implementation in clinical practice. Therefore, there is a critical need for more research in pharmacogenetics in Venezuela to increase data availability. Copyright © 2011-2015 by Walter de Gruyter GmbH.

Late blight of celery, caused by the fungus Septoria apiicola is the most limiting foliar disease in this crop, especially in the highlands of Táchira State, Venezuela, where control with agrochemicals is not enough for reducing the disease incidence. This research focused on the evaluation of the effect of different concentrations of ethanolic extracts (EE) from Lippia origanoides (Lo) and Gliricidia sepium (Gs) leaves, on the pathogen conidia (in vitro) and disease management, either as preventive or curative treatment, on celery plants in growing chambers. Both, EE of Lo and Gs showed fungicidal effects on conidia at concentrations of 0.25 and 0.8 %, respectively, while in vivo, this effect was observed at treatments Lo 15 % and Gs 19 %. Preventive and curative treatments with Lo 15 % showed their potential use to reduce disease infection 44 and 47.4 %, respectively, while with Gs 19 % the reduction was 69.5 and 64.4 %, respectively. On the other hand, when using Gs 19 % a light phytoxicity effect and a hormesis phenomenon were observed in the plants. © 2016, Universidad Centroccidental Lisandro Alvarado (UCLA). All Rights reserved.

Sanchez M.E.,University Centroccidental Lisandro Alvarado | Pastor M.,CAS Beijing Institute of Applied Physics And Computational Mathematics | Romana M.G.,Technical University of Madrid
Georisk | Year: 2013

This paper proposes an extension of methods used to predict the propagation of landslides having a long runout to smaller landslides with much shorter propagation distances. The method is based on: (1) a depth-integrated mathematical model including the coupling between the soil skeleton and the pore fluids, (2) suitable rheological models describing the relation between the stress and the rate of deformation tensors for fluidised soils and (3) a meshless numerical method, Smooth Particle Hydrodynamics, which separates the computational mesh (or set of computational nodes) from the mesh describing the terrain topography, which is of structured type - thus accelerating search operations. The proposed model is validated using two examples for which there are analytical solutions, and then it is applied to two short runout landslides which happened in Hong Kong in 1995, for which there is available information. © 2013 Taylor & Francis.

Roldan A.P.,University Centroccidental Lisandro Alvarado
Acta Agronomica | Year: 2015

A protocol for induced mutagenesis in clone Boconó (Allium sativum) microbulb cultured in vitro was established. For this, two assays were realized: test or radio sensitivity assays were performed to determine the appropriate gamma radiation dose and test or mutagenesis assays to determine the behavior of the plant material up to storage stage. In order to determine radio sensitivity, microbulbs grown were irradiated with four gamma ray doses (6, 8, 10 and 12 Krad) more control. Optimal dose was established considering 50% microbulb survival (LD50). In this assays a randomized blocks design with 5 treatments and 20 replications per treatment was used. After mutagenic treatment, microbulbs were irradiated with 8 and 10 Krad and then stored at 10 °C in darkness for 45 days. In this assays a randomized blocks design with 3 treatments considered two doses (8 and 10 Krad) more control and 20 replications per treatment was used. In both trials, higher mean weight and diameter were shown in microbulbs irradiated with 8 and 10 Krad, suggesting gamma irradiation to be applied with 8 and 10 Krad in order to facilitate mutant production with desirable agronomic traits in clone Boconó.

Discover hidden collaborations