Immigració i Educació. Rompen el mur?

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Lenguaje, poder y saber

El controvertido papel del lenguaje en los procesos de enseñanza y de aprendizaje y su relación con el poder son analizados en este artículo, cuestionando la forma en que mayoritariamente se pretende lograr la competencia lingüística, e incorporando elementos característicos de nuestros tiempos, como son la inmigración o las tecnologías de la información y la comunicación.The controversial role of language in the educational process of teaching and learning, and its relationship with power, are analysed in this article questioning the way in which linguistic competence is achieved. It incorporates typical modernday elements, such us immigration or informative and communicative technologies

Construyendo una alternativa de Educación Intercultural en Canarias

Este artículo es resultado de una reflexión al hilo de la experiencia acumulada por el Programa de Pluralidad Cultural, de la Consejería de Educación, Cultura y Deportes de Canarias, en la puesta en marcha de una propuesta de Educación Intercultural para las islas. En primer lugar, se señalan los presupuestos teóricos en los que se fundamentó dicho Programa. En segundo lugar, se caracteriza la realidad multicultural actual en el archipiélago y su repercusión en el sistema educativo, tanto en cuanto a la dimensión del tema como en relación con las principales concepciones que están condicionando la práctica educativa. Finalmente, se analizan, desde un punto de vista autocrítico, las principales líneas de actuación desarrolladas hasta el momento, basadas en la construcción colectiva de una alternativa, al tiempo que se apuntan algunas conclusiones y perspectivas de futuro.This article is the result of the reflection generated by the experience gathered in the development of a project of intercultural education in the context of a Program of Cultural Diversity, sponsored by the Educational Department of the Canary Islands Regional Goverment. We begin explaining the theoretical assumptions that underly the Program. Then, we describe the multicultural reality in the Canary Islands and its effects in the educational system. In the last past of the article we analyze, from a self-reflective point of view, the main actions developed till the moment, aimed to the colective construction of a practical alternative of intercultural education. Finally, we arrive to some conclusions and suggest a few proposals for further development

Extracción con líquidos presurizados para la obtención de fracciones antioxidantes y anti-inflamatorias a partir de la microalga Isochrysis galbana

Trabajo presentado a las I Jornadas Científicas del CIAL celebradas el 5 de junio de 2014 en Madrid.Las microalgas son consideradas como una fuente innovadora para el desarrollo de nuevos productos alimentarios y farmacéuticos debido a su alto contenido en moléculas de alto interés biológico, como ácidos grasos, carotenoides, vitaminas, esteroles, polisacáridos y compuestos fenólicos. Este contenido en moléculas bioactivas se ha relacionado con efectos funcionales beneficiosos para la salud, como consecuencia, por ejemplo, de su efecto antioxidante y anti-inflamatorio. En los últimos años se han empleado nuevos métodos de extracción para la obtención de dichos compuestos de interés mediante tecnologías medioambientalmente limpias, entre las que cabe destacar la extracción con líquidos presurizados (PLE). En este trabajo se ha llevado a cabo la extracción de la fracción fenólica de la microalga Isochrysis galbana mediante PLE. Para obtener un extracto de alto contenido en compuestos fenólicos, se realizó un diseño experimental (3^2) estudiando el efecto de la temperatura y el porcentaje de etanol en el disolvente, factores influyentes en el proceso de extracción PLE. Las variables respuesta fueron rendimiento de extracción (%), contenido de fenoles totales y actividad antioxidante. Por último, se llevo a cabo la extracción PLE con las condiciones optimizadas marcadas por el diseño experimental para la obtención de un extracto rico en compuestos fenólicos. Los extractos obtenidos se caracterizaron funcionalmente en términos de actividad anitioxidante y actividad anti-inflamatoria.M.H. agradece al MICINN su contrato de investigación “Ramón y Cajal”. I.L-E. agradece al CSIC por su contrato JAE-DOC. Los autores agradecen la financiación del proyecto “MIRACLES - Multi-product Integrated bioRefinery of Algae: from Carbon dioxide and Light Energy to high-value Specialties (KBBE-613588)”.Peer reviewe

A new approach to study the relative age effect with the use of additive logistic regression models: a case of study of FIFA football tournaments (1908-2012)

[Abstract]: The relative age effect plays an important role in the pursuit of excellence, providing advantage to athletes born at the beginning of the year or near the cut-off date. This phenomenon has been observed in areas such as sports, education or business. Traditionally, the chisquare test has been used to analyze whether there are statistically significant differences in the distribution of births in each of the four quarters of the year. However, this approach is limited, focusing only on the analysis of the response variable, without taking into account the effect of a set of predictive variables. In this paper a new approach is proposed to study the relative age effect with the use of a logistic regression additive model. The new method has been evaluated with a sample of 21,639 players involved in football tournaments organized by the Fédération Internationale de Football Association (FIFA) between 1908 and 2012. New conclusions have been established that the relative age effect exists regarding player age and the year of the competition in male FIFA competitions and its effect is dynamic and complex.Xunta de Galicia; ED431G/0

Late Quaternary sediment dynamics in the Gulf of San Jorge (Patagonia): A multi-proxy approach

The Patagonian coast of the Argentine Continental Shelf (ACS) extends along a relatively stable continental margin at the intersection of the present Antarctic ice sheet and the relic of the former Patagonian ice sheet. Since the Last Glacial Maximum (LGM), the sedimentation on the Atlantic shore of Patagonia has changed significantly due to the marine transgression at first, but also because of the decrease of glacial meltwater flows to the Atlantic derived from the Northern Patagonian Ice Field (NPIF) 1. The Patagonian shore of the ACS thus provides a preferential area to study the impact of post-LGM sea-level fluctuations and ice extent variations on sedimentary processes. In this context, we investigate Late Quaternary marine sediments from the Gulf of San Jorge (GSJ) to characterize the sedimentation in the central part of the Argentine Patagonian margin since the LGM. The GSJ is a semicircular basin forming an encroachment of the South Atlantic Ocean between latitudes 45°and 47° S, in which the sedimentation is presently controlled by oceanic and aeolian inputs, and inner Gulf erosion/runoffs 2. The post-glacial evolution of the sedimentary environments as well as the climatic and oceanographic variations were reconstructed using paleomagnetic parameters, major and trace elements, bulk and clay mineralogy, multi-sensor core logging and radiocarbon dating, coupled with the interpretation of seismic lines. The ~2000 km of geophysical data (subbottom profiler and sparker) and the 15 sediment cores (gravity and piston cores) used in this study were collected on board the R/V Coriolis II during the MARGES (Marine Geology of the Gulf of San Jorge) expedition in the GSJ and continental shelf in 2014. The base of the lithostratigraphy identified in the Gulf is characterized by a decametric-thick highly-indurated sediment layer corresponding to a high amplitude and laterally continuous seismic reflection extending through the entire GSJ. This facies most likely reflects both the sea-level lowstand and absence of seawater in this part of the GSJ during the LGM. Furthermore, our results illustrate two main sedimentary sequences: a Late glacial sequence with relatively high sedimentation rates (>65 cm/kyr) and an Early Holocene to present sequence with lower sedimentation rates (<25 cm/kyr). The former is associated with the marine transgression (e.g., tidal flat environment) coupled with the influence of the NPIF drainage system prior to 13 700 cal yr BP. The latter corresponds to the end of the marine transgression with a progressive decrease of energy to reach contemporary conditions between 10 250 and 7400 cal yr BP.Fil: Desiage, P. A.. Institut des Sciences de la Mer de Rimouski; CanadáFil: Onge, G.. Institut des Sciences de la Mer de Rimouski; CanadáFil: Montero Serrano, J. C.. Institut des Sciences de la Mer de Rimouski; CanadáFil: Haller, Miguel Jorge F.. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina20th International Sedimentological CongressQuebecCanadáInternational Association of SedimentogistsSociety for Sedimentary Geolog

Power Transmission Lines: Worldwide Research Trends

The importance of the quality and continuity of electricity supply is increasingly evident given the dependence of the world economy on its daily and instantaneous operation. In turn, the network is made up of power transmission lines. This study has been carried out based on the Scopus database, where all the publications, over 5000 documents, related to the topic of the power transmission lines have been analyzed up to the year 2022. This manuscript aims to highlight the main global research trends in power transmission lines and to detect which are the emerging areas. This manuscript cover three main aspects: First, the main scientific categories of these publications and their temporal trends. Second, the countries and affiliations that contribute to the research and their main research topics. Third, identification of the main trends in the field using the detection of scientific communities by means of the clustering method. The three main scientific categories found were Engineering, Energy and Computer Science. This research is most strongly developed in China, as the top 10 institutions are from this country, followed by USA and in third place by Russia. Twelve lines of research have been detected: Line Inspection, Leakage Current, Magnetic Fields, Fault Location, Icing, Lines Design, Natural Disasters, Temperature, Half-wave, Arc Flash, Pattern Recognition, and Artificial Intelligence. This research will open new perspectives for future research on power transmission lines

Functional Identification of Proteus mirabilis eptC gene encoding a Core Lipopolysaccharide Phosphoethanolamine Transferase

By comparison of the Proteus mirabilis HI4320 genome with known lipopolysaccharide (LPS) phosphoethanolamine transferases, three putative candidates (PMI3040, PMI3576, and PMI3104) were identified. One of them, eptC (PMI3104) was able to modify the LPS of two defined non-polar core LPS mutants of Klebsiella pneumoniae that we use as surrogate substrates. Mass spectrometry and nuclear magnetic resonance showed that eptC directs the incorporation of phosphoethanolamine to the O-6 of l-glycero-d-mano-heptose II. The eptC gene is found in all the P. mirabilis strains analyzed in this study. Putative eptC homologues were found for only two additional genera of the Enterobacteriaceae family, Photobacterium and Providencia. The data obtained in this work supports the role of the eptC (PMI3104) product in the transfer of PEtN to the O-6 of l,d-HepII in P. mirabilis strains

IAA : Información y actualidad astronómica (44)

Sumario : La importancia de los cometas.-- Gamow, Alpher y el ylem.-- DECONSTRUCCIÓN Y otros ENSAYOS. El universo molecular.-- EL “MOBY DICK” DE... Alberto Molino (IAG).-- CIENCIA EN HISTORIAS...Tras la estela de Plateau.-- ACTUALIDAD.-- SALA LIMPIA.-- CIENCIA: PILARES E INCERTIDUMBRES. Explosiones de rayos gamma.N