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In this work the transformation process of sunflower oil in order to obtain biodiesel by means of transesterification was studied. Taguchi's methodology was chosen for the optimisation of the most important variables (temperature conditions, reactants proportion and methods of purification), with the purpose of obtaining a high quality biodiesel that(More)
Between July 2005 and June 2006, a case-control study was carried out to identify risk factors for hydatidosis in Lima, Peru. As a result, 32 cases were matched according to age, sex and birthplace in 64 controls. The participants were interviewed using a questionnaire designed to evaluate environmental and behavior factors associated to hydatidosis. By(More)
We conducted a questionnaire-based case-control study to identify risk factors for cystic echinococcosis (CE) in Lima, Peru during July-December 2005. Data were obtained from 32 cases and 64 controls. Multivariate conditional logistic regression showed that having owned > or =10 dogs [adjusted odds ratio (AOR) 8.7, 95% CI 1.3-57.5) and raising sheep (AOR(More)
1  Abstract In this paper, we describe our decade-long experience of building and operating one of the most active Institutional Repository in the world: www.saber.ula.ve <http://www.saber.ula.ve> (University of the Andes, Mérida-Venezuela). In order to share our experience with other institutions, we firstly explain the steps we followed to preserve and(More)
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