Procesos meta-cognitivos en las clases de matemáticas de la escuela elemental : propuesta de un marco interpretativo.

Resumen tomado de la publicación

La investigación en educación especial desde un enfoque interpretativo.

Resumen en castellano y en inglés

Metodolog??a de investigaci??n en Educaci??n Infantil. 'El modelo interpretativo ekfr??stico'

En educaci??n literaria se habla de estrategias de formaci??n para conseguir, durante las etapas educativas, una competencia lectora eficaz. La presente investigaci??n tiene su origen en la teor??a literaria comparatista y en la intertextualidad, donde el modelo de referencia surge del principio ekfr??stico, definido como la descripci??n literaria de una obra de arte. Esta investigaci??n se lleva a cabo en el C.P. 'Gin??s D??az-San Cristobal' de Alhama de Murcia, donde se somete al alumnado de Educaci??n Infantil a tres cuestionarios adaptados a su nivel, consiguiendo finalmente la motivaci??n afectiva con el modelo propuesto.

Vis, veo!, ¿qué ves? : los medios audiovisuales en la escuela rural.

Ayudas concedidas a proyectos de innovación educativa para el curso 1977-1998. Anexo Memoria en C-Innov.44

Enseñanza para la comprensión : marco interpretativo de la construcción del conocimiento en clases de ciencias

Resumen basado en el de la publicación. Resumen en inglés

Otra forma de enseñar Historia del arte : la semiótica como método interpretativo de la publicidad de pretexto artístico.

Resumen basado en el de la publicación.

El carácter interpretativo del lenguaje científico

Resumen en inglés. Monográfico con el título: Enseñanza y aprendizaje del discurso científico

Hacia un nuevo marco interpretativo de la asistencia internacional para el desarrollo (Artículos Varios)

Este artículo intenta construir una perspectiva alternativa al estudio de la asistencia internacional para el desarrollo. Para ello, el autor analiza las variables internacionales que han determinado la trayectoria y el cambio de la misma, desde sus inicios en 1948 hasta el presente. Estas variables tendrían que ver con los intereses de los donantes, la dinámica organizacional de las agencias canalizadoras de la asistencia,y las ideas y teorías que sobre el desarrollo internacional han predominado en cada momento. El artículo concluye con la presentación de un marco interpretativo de la asistencia, el cual busca explicar su origen, carácter y cambio en las últimas décadas, de un paradigma centrado en la formación de capital al paradigma del desarrollo humano sustentable.

Low-lying excited states and primary photoproducts of [Os-3(CO)(10)-(s-cis-L)] (L = cyclohexa-1,3-diene, buta-1,3-diene)] clusters studied by picosecond time-resolved UV/Vis and IR spectroscopy and by density functional theory

Combined picosecond transient absorption and time-resolved infrared studies were performed, aimed at characterising low-lying excited states of the cluster [Os-3(CO)(10)(s-cis-L)] (L= cyclohexa-1,3-diene, 1) and monitoring the formation of its photoproducts. Theoretical (DFT and TD-DFT) calculations on the closely related cluster with L=buta-1,3-diene (2') have revealed that the low-lying electronic transitions of these [Os-3(CO)(10)(s-cis-1,3-diene)] clusters have a predominant sigma(core)pi*(CO) character. From the lowest sigmapi* excited state, cluster 1 undergoes fast Os-Os(1,3-diene) bond cleavage (tau=3.3 ps) resulting in the formation of a coordinatively unsaturated primary photoproduct (1a) with a single CO bridge. A new insight into the structure of the transient has been obtained by DFT calculations. The cleaved Os-Os(1,3-diene) bond is bridged by the donor 1,3-diene ligand, compensating for the electron deficiency at the neighbouring Os centre. Because of the unequal distribution of the electron density in transient la, a second CO bridge is formed in 20 ps in the photoproduct [Os-3(CO)(8)(mu-CO)(2)- (cyclohexa-1,3-diene)] (1b). The latter compound, absorbing strongly around 630 nm, mainly regenerates the parent cluster with a lifetime of about 100 ns in hexane. Its structure, as suggested by the DFT calculations, again contains the 1,3-diene ligand coordinated in a bridging fashion. Photoproduct 1b can therefore be assigned as a high-energy coordination isomer of the parent cluster with all Os-Os bonds bridged.

Raman, IR, UV-vis and EPR characterization of two copper dioxolene complexes derived from L-dopa and dopamine

The anionic complexes [Cu(L(1-))(3)](1-), L(-) = dopasemiquinone or L-dopasemiqui none, were prepared and characterized. The complexes are stable in aqueous solution showing intense absorption bands at ca. 605 nm for Cu(II)-L-dopasemiquinone and at ca. 595 nm for Cu(II)-dopasemiquinone in the UV-vis spectra, that can be assigned to intraligand transitions. Noradrenaline and adrenaline, under the same reaction conditions, did not yield Cu-complexes, despite the bands in the UV region showing that noradrenaline and adrenaline were oxidized during the process. The complexes display a resonance Raman effect, and the most enhanced bands involve ring modes and particularly the vCC + vCO stretching mode at ca. 1384 cm(-1). The free radical nature of the ligands and the oxidation state of the Cu(II) were confirmed by the EPR spectra that display absorptions assigned to organic radicals with g= 2.0005 and g = 2.0923, and for Cu(II) with g = 2.008 and g = 2.0897 for L-dopasemiquinone and dopasemiquinone, respectively. The possibility that dopamine and L-dopa can form stable and aqueous-soluble copper complexes at neutral pH, whereas noradrenaline and adrenaline cannot, may be important in understanding how Cu(II)-dopamine crosses the cellular membrane as proposed in the literature to explain the role of copper in Wilson disease. (c) 2008 Elsevier B.V. All rights reserved.

Expedient, accurate methods for the determination of the degree of substitution of cellulose carboxylic esters: Application of UV-vis spectroscopy (dye solvatochromism) and FTIR

Two techniques, namely UV-vis- and FTIR spectroscopy, have been employed in order to calculate the degree of substitution (DS) of cellulose carboxylic esters, including acetates, CAs, butyrates, CBs, and hexanoates, CHs. Regarding UV-vis spectroscopy, we have employed a novel approach, based on measuring the dependence of lambda(max) of the intra-molecular charge-transfer bands of polarity probes adsorbed on DS of the ester films (solvatochromism). Additionally, we have revisited the use of FTIR for DS determination. Several methods have been used in order to plot Beer`s law graph, namely: Absorption of KBr pellets, pre-coated with CA: reflectance (DRIFTS) of CAs-KBr solid-solid mixtures with, or without the use of 1.4-dicyanobenzene as an internal reference; reflectance of KBr powder pre-coated with CA. The methods indicated are simple, fast, and accurate, requiring much less ester than the titration method. The probe method is independent of the experimental variables examined. (c) 2010 Published by Elsevier Ltd.

Molecular modeling and UV-vis spectroscopic studies on the mechanism of action of reversed chloroquine (RCQ)

Reversed chloroquine (RCQ) is a multiple ligand compound active against chloroquine-sensitive and resistant falciparum malaria. It is composed by a 4-aminoquinoline moiety (like that present in chloroquine (CQ)) joined to imipramine (IMP), a modulating agent that also showed intrinsic antiplasmodial activity against Brazilian Plasmodium falciparum isolates resistant to CQ. Molecular modeling and ultraviolet-visible spectroscopy (UV-vis) studies strongly suggest that the interaction between RCQ and heme is predominant through the quinoline moiety in a mechanism of action similar to that observed for CQ. (C) 2010 Elsevier Ltd. All rights reserved.

"Amningen känns så skör på ett annat vis" : Hur kvinnor som ammar förskolebarn upplever bemötandet av förskolans pedagoger.

The aim of this study was to visualize in a pluralistic perspective how mothers of breastfed preschool children experience being treated by preschool teachers. Method: Qualitative interviews with 10 mothers and qualitative content analysis. The mothers experienced breastfeeding was surrounded by slience at preschool. The mothers were met with silence, felt vulnerable and did not want to be subject to criticizm. To the best of our knowledge, this is the first investigation on this subject. 

Investigation of Iron (III) desferrioxamine B oxalate ligand exchange by UV-vis spectroscopy: the next step in developing a quantitative analytical method for measuring bioavailable iron in marine ecosystems

To date there are no analytical techniques designed to exclusively measure bioavailable iron in marine environments. The goal of this research is to develop such a technique by isolating the bioavailable iron using the terrestrial siderophore desferrioxamine B (DFB). This project contained many challenging aspects, but the specific goal of this study was to develop a robust analytical technique for quantification of Fe(III)-DFB complexes at nanomolar concentrations. Past work showed that oxalate (Ox) promotes photodissociation of Fe(III)-DFB to Fe(Il), and we are specifically interested in the mechanism of this process. A model was developed using known thermodynamic constants for Fe(III)-DFB and Fe(III) oxalato complexes and adjusting for ionic strength. The model was confirmed by monitoring the UV-VIS absorbance of the system at a variety of oxalate concentrations and pH. The model did not include ternary complexes. Next., the rate of Fe(1I) production during UV irradiation was examined. The results showed that the rate of Fe(II) production was based entirely on the [Fe(Ox)?]3- speciation, and that reoxidation of Fe(II) occurred via reactive oxygen intermediates. This reoxidation could be avoided by either decreasing the oxygen concentration or by adding a Fe(II) stabilizing reagent, such as ferrozine. Further studies need to be done to confirm that these results apply at sub nanomolar concentrations, and the issue of Fe(II) reoxidation at lower Fe concentrations needs to be addressed.