Fundamentaci??n metate??rica del paradigma cr??tico : potencialidades y l??mites para la ciencia pedag??gica

Resumen del autor

Los l??mites como campo de aprendizaje

Entre la prohibici??n y la obligaci??n se extiende el territorio de lo aceptable. Ambas fronteras delimitan el espacio de la convivencia. La vida social se desarrolla en un espacio delimitado por normas, que imponen l??mites y ofrecen posibilidades. Ante los conflictos con las normas o los l??mites, hay que ejercer la autoridad y la pedagog??a. Padres y educadores deben explicar la necesidad de los l??mites. Por otro lado, ante un l??mite se puede actuar respet??ndolo, resignarse sumisamente o transgredirlo. La transgresi??n puede ser por inmadurez o por desobediencia responsable. La autoridad educativa no consiste en prohibir y reprimir, sino en ayudar a tomar decisiones aut??nomas. Se debe ceder el poder a los alumnos para llegar a la autodisciplina. Y por ??ltimo, se debe confiar en que esta estrategia funcione sin estar pendiente de los resultados.

Las actividades acu??ticas como contenido de la educaci??n f??sica en la ense??anza secundaria : un estudio sobre sus potencialidades y l??mites a trav??s de la ??ptica del profesorado de educaci??n f??sica de la Regi??n de Murcia

Resumen basado en el de la publicaci??n

L'ensenyament de l'angl??s a l'educaci?? infantil : mites i reptes

Resumen basado en el de la publicaci??n

Desde el arte contempor??neo, traspasar los l??mites impuestos

Pertenece a un dossier titulado Arte y diversidad sexual.

Posibilidades y l??mites de una dimensi??n europea de la educaci??n

Monogr??fico con el t??tulo: La Libreta ???Extra 25 a??os???

Marcar los l??mites

Resumen basado en el de la publicaci??n

El trabajo en red como fuente de aprendizaje : posibilidades y l??mites para la creaci??n de conocimiento : una visi??n cr??tica

Resumen basado en el de la publicaci??n

La organizaci??n escolar y los l??mites de la mediaci??n de los inspectores en los institutos de secundaria

Monogr??fico con el t??tulo: 'La organizaci??n escolar y los l??mites de la mediaci??n de los inspectores en los institutos de secundaria '

Carcases and mites

Mites are involved in the decomposition of animal carcases and human corpses at every stage. From initial decay at the fresh stage until dry decomposition at the skeletal stage, a huge diversity of Acari, including members of the Mesostigmata, Prostigmata, Astigmata, Endeostigmata, Oribatida and Ixodida, are an integral part of the constantly changing food webs on, in and beneath the carrion. During the desiccation stage in wave 6 of M,gnin's system, mites can become the dominant fauna on the decomposing body. Under conditions unfavourable for the colonisation of insects, such as concealment, low temperature or mummification, mites might become the most important or even the only arthropods on a dead body. Some mite species will be represented by a few specimens, whereas others might build up in numbers to several million individuals. Astigmata are most prominent in numbers and Mesostigmata in diversity. More than 100 mite species and over 60 mite families were collected from animal carcases, and around 75 species and over 20 families from human corpses.

Phoretic mites associated with animal and human decomposition

Phoretic mites are likely the most abundant arthropods found on carcases and corpses. They outnumber their scavenger carriers in both number and diversity. Many phoretic mites travel on scavenger insects and are highly specific; they will arrive on a particular species of host and no other. Because of this, they may be useful as trace indicators of their carriers even when their carriers are absent. Phoretic mites can be valuable markers of time. They are usually found in a specialised transitional transport or dispersal stage, often moulting and transforming to adults shortly after arrival on a carcase or corpse. Many are characterised by faster development and generation cycles than their carriers. Humans are normally unaware, but we too carry mites; they are skin mites that are present in our clothes. More than 212 phoretic mite species associated with carcases have been reported in the literature. Among these, mites belonging to the Mesostigmata form the dominant group, represented by 127 species with 25 phoretic mite species belonging to the family Parasitidae and 48 to the Macrochelidae. Most of these mesostigmatids are associated with particular species of flies or carrion beetles, though some are associated with small mammals arriving during the early stages of decomposition. During dry decay, members of the Astigmata are more frequently found; 52 species are phoretic on scavengers, and the majority of these travel on late-arriving scavengers such as hide beetles, skin beetles and moths. Several species of carrion beetles can visit a corpse simultaneously, and each may carry 1-10 species of phoretic mites. An informative diversity of phoretic mites may be found on a decaying carcass at any given time. The composition of the phoretic mite assemblage on a carcass might provide valuable information about the conditions of and time elapsed since death.

Design of supramolecular beta-sheet forming beta-turns containing aromatic rings and non-coded alpha-aminoisobutyric acid and the formation of flat fibrillar structures through self-assembly

Single crystal X-ray diffraction studies show that the three designed tripeptides Boc-Leu-Aib-m-NA-NO2 (I), Boc-Phe-Aib-m-NA-NO2 (II) and Boc-Pro-Aib-m-ABA-OMe (III) (Aib, -aminoisobutyric acid; m-NA, m-nitroaniline; m-ABA, m-aminobenzoic acid; Boc, t-butyloxycarbonyl) containing aromatic rings in the backbones adopt -turn structures that are self-assembled through intermolecular hydrogen bonds and van der Waals interactions to create layers of -sheets. Solvent-dependent NMR titration and CD studies show that the -turn structures of the peptides also exist in the solution phase. The field emission scanning electron microscopic and transmission electron microscopic images of the peptides in the solid state reveal fibrillar structures of flat morphology that are formed through -sheet mediated self-assembly of the preorganised -turn building blocks.

An investigation and comparison of the bioactivity of selected essential oils on human lice and house dust mites

The insecticidal potency of some essential oils suggests that they may find an application in the control of house dust mites, but current in vitro assays for mites do not appear to give consistent results. A simple, novel, mite chamber assay was therefore developed to carry out testing. Different species of insects are susceptible to different essential oil components, so we compared the relative acaricidal and pediculicidal activity of three essential oils: tea tree, lavender and lemon, because the activity of their constituents on lice ranges from highly active to virtually inactive. The most effective essential oil against both lice and mites was tea tree oil; lavender was the second most effective, and lemon oil the least, although it did show activity against mites, unlike lice. The assay proved simple and effective and gave reproducible results. (c) 2007 Elsevier B.V. All rights reserved.

'Flat phase' PID controllers

Flat Phase PID Controllers have the property that the phase of the transfer function round the associated feedback loop is constant or flat around the design frequency, with the aim that the phase margin and overshoot to a step response is unaffected when the gain of the device under control changes. Such designs have been achieved using Bode Integrals and by ensuring the phase is the same at two frequencies. This paper extends the ‘two frequency’ controller and describes a novel three frequency controller. The different design strategies arc compared.