¿Qué nos cuentan los jóvenes? Narraciones biográficas sobre las relaciones de los jóvenes con el saber en la escuela secundaria

[spa] El contenido de esta publicación se deriva de la investigación "Repensar el éxito y el fracaso escolar de la Educación Secundaria desde la relación de los jóvenes con el saber". Ministerio de Ciencia e Innovación. EDU2008-03287. 2008-2011. Las narraciones biográficas rescatan las experiencias escolares de estudiantes que durante su recorrido en la escuela secundaria se encontraron en una posición de éxito o fracaso escolar. La publicación da cuenta de relatos de situaciones, historias, conductas y discursos en torno a las experiencias de relación de un grupo de jóvenes con los saberes de la escuela secundaria y fuera de ella.

¿Qué nos cuentan los jóvenes? Narraciones biográficas sobre las relaciones de los jóvenes con el saber en la escuela secundaria

[spa] El contenido de esta publicación se deriva de la investigación "Repensar el éxito y el fracaso escolar de la Educación Secundaria desde la relación de los jóvenes con el saber". Ministerio de Ciencia e Innovación. EDU2008-03287. 2008-2011. Las narraciones biográficas rescatan las experiencias escolares de estudiantes que durante su recorrido en la escuela secundaria se encontraron en una posición de éxito o fracaso escolar. La publicación da cuenta de relatos de situaciones, historias, conductas y discursos en torno a las experiencias de relación de un grupo de jóvenes con los saberes de la escuela secundaria y fuera de ella.

Out-of-sample forecast tests robust to the choice of window size

This paper proposes new methodologies for evaluating out-of-sample forecastingperformance that are robust to the choice of the estimation window size. The methodologies involve evaluating the predictive ability of forecasting models over a wide rangeof window sizes. We show that the tests proposed in the literature may lack the powerto detect predictive ability and might be subject to data snooping across differentwindow sizes if used repeatedly. An empirical application shows the usefulness of themethodologies for evaluating exchange rate models' forecasting ability.

Quality of Learners' Time and Learning Performance Beyond Quantitative Time-on-Task

Peer-reviewed

Most of the Abundant Protein Fractions of Embryonic Cerebrospinal Fluid are Produced Out of the Brain Anlagen

The microenvironment of the central nervous system is important for neuronal function and development. During the early stages of embryo development the cephalic vesicles are filled by embryonic cerebrospinal fluid, a complex fluid containing different protein fractions, which contributes to the regulation of the survival, proliferation and neurogenesis of neuroectodermal stem cells. The protein content of embryonic cerebrospinal fluid from chick and rat embryos at the start of neurogenesis has already been determined. Most of the identified gene products are thought to be involved in the regulation of developmental processes during embryogenesis. However, due to the crucial roles played by embryonic cerebrospinal fluid during brain development, the embryological origin of the gene products it contains remains an intriguing question. According to the literature most of these products are synthesised in embryonic tissues other than the neuroepithelium. In this study we examined the embryological origin of the most abundant embryonic cerebrospinal fluid protein fractions by means of slot-blot analysis and by using several different embryonic and extraembryonic protein extracts, immunodetected with polyclonal antibodies. This first attempt to elucidate their origin is not based on the proteins identified by proteomic methods, but rather on crude protein fractions detected by SDS-PAGE analysis and to which polyclonal antibodies were specifically generated. Despite some of the limitations of this study, i.e. that one protein fraction may contain more than one gene product, and that a specific gene product may be contained in different protein fractions depending on post-translational modifications, our results show that most of the analysed protein fractions are not produced by the cephalic neuroectoderm but are rather stored in the egg reservoir; furthermore, few are produced by embryo tissues, thus indicating that they must be transported from their production or storage sites to the cephalic cavities, most probably via embryonic serum. These results raise the question as to whether the transfer of proteins from these two embryo compartments is regulated at this early developmental stage.

Consideraciones metodológicas para la enseñanza y el aprendizaje del deporte escolar = Methodological considerations for the teaching and learning of school sport

Sport is a fundamental content in the teaching and learning of Physical Education independently of whether it is seen assuch by some authors. In whichever case according to the treatment that we give it, it will have sufficient educationalpotential without forgetting that it is the student who is the important figure in the process. To achieve the objectives wemust facilitate practices that are in agreement with the indispensable ethical principles to try to bring about a meaningfuland functional learning. The methodological criteria that we present in this article have this intention helped by examplesthat make it easier to understand the teaching learning process