Entity

Time filter

Source Type

Guadalupe, Spain

Leon G.,Technical University of Cartagena | Martinez G.,Technical University of Cartagena | Leon L.,UCAM | Guzman M.A.,Technical University of Cartagena
Physicochemical Problems of Mineral Processing | Year: 2016

The demand for cobalt has increased significantly in recent years due to its use in a wide variety of products and processes. Cobalt and nickel often accompany each other in nature and close physicochemical properties of both metals make their separation a complicated practical problem. Organophosphorous extractants have been widely used to separate cobalt from nickel. This paper presents the preliminary results obtained for separation of cobalt from nickel using Cyanex 272 containing supported liquid membranes prepared by a novel ultrasound-assisted method. The results show that this novel supported liquid membrane preparation method leads to higher separation factors than those described in the literature under similar separation conditions. Source


Hastie P.A.,Auburn University | de Ojeda D.M.,Colegio de Educacion Infantil | Luquinc A.C.,UCAM
Physical Education and Sport Pedagogy | Year: 2011

Background: In 2005, Wallhead and O'Sullivan presented a review of research on the Sport Education model. In that review, the authors identified certain strengths of the model (particularly persistent team membership) in facilitating student engagement within student-centered learning tasks. Other areas (such as student leadership skills) were considered as potentially problematic. Suggestions were also made for future research. Purpose: The three purposes of this review were to conduct a review of research on Sport Education since the 2005 analysis, to identify any new trends in research since the original review, and to describe the extent to which the limitations and future research directions of Wallhead and O'Sullivan have been addressed. Data collection: Papers for analysis were selected through searches of EBSCO databases with the main identifier 'sport education'. Further journal articles were then obtained through the citations and references in the original documents. Data analysis: Papers were initially categorized according to the following dimensions: country of origin, focus, participants, sport and length of season, data courses, analysis and results. They were then discussed in terms of the five common content standards and aims of physical education (e.g. skill and fitness development, personal and social responsibility) used in the 2005 review. Findings: Thirty-eight papers were identified that satisfied the selection criteria, with all content standards receiving attention. Since the 2005 review, there been not only an expansion in the number of studies relating to Sport Education, but also the initiation of research in a number of new contexts, as well as those focused on new research questions. An analytic induction of these papers has placed them into three categories: (1) expanded sites of implementation; (2) students' motivational responses; and (3) learning to teach Sport Education. Conclusions: Studies of Sport Education now take place in more diverse settings than before, and continue to progress with more sophisticated research designs and larger sample sizes. Still, more investigation is needed in the areas of peer instruction and the transfer of school-based learning to community sport. © 2011 Association for Physical Education. Source


This work focuses its interest in the difficult relationships between health and social disciplines when facing a complex problem as alcohol consumption. The question is whether the scientific practice has the capacity to reduce risks, or on the contrary it is necessary to protect ourselves from the dangers which it produces. Social scientists complain about the limited use that medicine makes of the vast existing heritage about the cultural-based alcoholism. At the same time scientists criticize the inefficiency of biomedical approaches. In this article, we highlight the importance of a contextualized analysis about the alcohol consumption that takes into account the functions and consequences from the social structure that gives it collective and subjective significance. Current paradoxes in the social government of dependencies are manifested. Looking to the phenomenon of collective consumption of alcohol among young people, we suggest alternative approaches that incorporate the mean-ings and intervention capacity of the subjects themselves. © 2014, Fundacion Index. All rights reserved. Source


Gil-Izquierdo A.,CSIC - Center of Edafology and Applied Biology of the Segura | Penalvo J.L.,CNIC | Gil J.I.,Radiodiagnostic Unity | Medina S.,CSIC - Center of Edafology and Applied Biology of the Segura | And 8 more authors.
Current Pharmaceutical Biotechnology | Year: 2012

Cardiovascular disease (CVD) mortality rates are lower in Asian countries where dietary patterns are very different from Western diet. A number of studies have linked these lower rates to the inclusion of soy products as a staple food in those countries. Soy is the richest dietary source of isoflavones, a type of phytoestrogen associated with many potentially beneficial effects. Isoflavone-containing soy protein consumption has been linked to reduced levels of LDL cholesterol in hypercholesterolemic patients. This effect is increased with the concomitant administration of isoflavones, and seems to be also complemented by the isoflavone capacity to restore the endothelial function in patients with weak and moderated endothelial dysfunction. The effects are variable depending on individuals' metabolism and in particular to their ability to convert daidzein to equol that seems to be restricted to approximately 1/3 of the population. Equol production has been indeed linked to a decreased arterial stiffness and antiatherosclerotic effects via NO production. Because the relevance of isoflavones consumption on the modulation of cardiovascular risk still remains unclear, this paper aims to review the existing knowledge on the biological activity of the isoflavones on the human cardiovascular system from an epidemiological, clinical and - omics point of view. © 2012 Bentham Science Publishers. Source


A phylogeny is a tree that relates taxonomic units based on their similarity over a set of characteristics. The phylogeny problem under the parsimony criterion consists in finding a phylogeny with a minimum number of evolutionary steps. We propose hybrid heuristic methods - based on GRASP, path-relinking and genetic algorithm methodologies - to build a phylogeny while minimizing parsimony. Computational experiments using benchmark conditions are reported, and the results obtained by the proposed hybrid heuristics are compared with the solutions obtained by a traditional GRASP (without hybridization) heuristic and with previously reported solutions in the literature. The experimental results illustrate that the proposed heuristics are efficient in terms of solution quality and time-to-target-value. Source

Discover hidden collaborations