130 resultados para SOMBREROS DE PAJA TOQUILLA


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El objeto de estudio de este artículo es el edificio de viviendas para los empleados de la fábrica de sombreros Borsalino en Alessandria, proyectado y construido por el arquitecto Ignazio Gardella entre los años 1948 y 1952. Gardella trabaja a distintas escalas en esta propuesta otorgando un valor distinto a cada una de ellas. La estructura del texto responde a esta visión escalar. Se analiza la relación del edificio con laciudad y el contexto adyacente; los espacios comunes; la vivienda; el estar y finalmente la ventana. La importancia otorgada a cada parte, en el desarrollo del artículo, responde a la intensidad con la que Gardella aborda cada escala de acercamiento al proyecto. Finalmente, se reflexiona sobre la vigencia y atemporalidad de estas viviendas que refl ejan un perfecto entendimiento del lugar y una relación directa con la arquitectura tradicional del norte de Italia, además de proponer la flexibilidad en el habitar y el control del clima a través del cerramiento.

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Previously, synaptic activity in the spinal cord of adult mammals was attributed exclusively to chemical neurotransmission. In this study, evidence was obtained for the existence, relative abundance, and widespread distribution of "mixed" (chemical and electrical) synapses on neurons throughout the spinal cords of adult mammals. Using combined confocal microscopy and "grid-mapped freeze fracture," 36 mixed synapses containing 88 "micro" gap junctions (median = 45 connexons) were found and mapped to 33 interneurons and motor neurons in Rexed laminae III-IX in cervical, thoracic, and lumbosacral spinal cords of adult male and female rats. Gap junctions were adjacent to presumptive active zones, where even small gap junctions would be expected to increase synaptic efficacy. Two morphological types of mixed synapse were discerned. One type contained distinctive active zones consisting of "nested" concentric toroidal deformations of pre- and postsynaptic membranes, which, because of their unusual topology, were designated as "synaptic sombreros." A second type had gap junctions adjacent to active zones consisting of broad, flat, shallow indentations of the plasma membrane. Morphometric analysis indicates that mixed synapses correspond to 3-5% of all synapses on the somata and proximal dendrites, but, because of their subcellular location and morphology, they could represent 30-100% of excitatory synapses. The relative abundance of mixed synapses on several classes of neurons in spinal cords of adult rats suggests that mixed synapses provide important but previously unrecognized pathways for bidirectional communication between neurons in the mammalian central nervous system.

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Las h. de grabado pleg. son calcográficas.

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Mode of access: Internet.

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Mode of access: Internet.

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El pie diabético viene determinado por la neuropatía que se produce en el paciente con diabetes y el traumatismo sobre el pie con la microangiopatía propia de la diabetes asociada o no a la macroangiopatía. Presentamos un paciente joven con mal control de la glucemia y de la lesión trófica que pudo conservar la funcionalidad de la extremidad con un tratamiento adecuado.

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deo 3,35', Formato 360x288p, mp4

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An important episode of carbon sequestration, Oceanic Anoxic Event 1a (OAE-1a), characterizes the Lower Aptian worldwide, and is mostly known from deeper-water settings. The present work of two Lower Aptian deposits, Madotz (N Spain) and Curití Quarry (Colombia), is a multiproxy study that includes fossil assemblages, microfacies, X-ray diffraction bulk and clay mineralogy, elemental analyses (major, minor, trace elements), Rock-Eval pyrolysis, biomarkers, inorganic and organic carbon content, and stable carbon isotopes. The results provide baseline evidence of the local and global controlling environmental factors influencing OAE-1a in shallow-water settings. The data also improve our general understanding of the conditions under which organic-carbon-rich deposits accumulate. The sequence at Madotz includes four intervals (Unit 1; Subunits 2a, 2b and 2c) that overlap the times prior to, during and after the occurrence of OAE-1a. The Lower Unit 1(3m thick) is essentially siliciclastic, and Subunit 2a (20m) contains Urgonian carbonate facies that document abruptly changing platform conditions prior to OAE-1a. Subunit 2b (24.4 m) is a mixed carbonate-siliciclastic facies with orbitolinid-rich levels that coincides with OAE-1a δ13C stages C4-C6, and is coeval with the upper part of the Deshayesites forbesi ammonite zone. Levels with pyrite and the highest TOC values (0.4-0.97%), interpreted as accumulating under suboxic conditions, and are restricted to δ13C stages C4 and C5. The best development of the suboxic facies is at the level representing the peak of the transgression. Subunit 2c, within δ13C stage C7, shows a return of the Urgonian facies. The 23.35-m section at Curití includes a 6.3-m interval at the base of the Paja Formation dominated by organic-rich marlstones and shales lacking benthic fossils and bioturbation, with TOC values as high as 8.84%. The interval overlies a level containing reworked and phosphatized assemblages of middle Barremian to lowest Aptian ammonites. The range of values and the overall pattern of the δ13Corg (-22.05‰ to -20.47‰) in the 6.3m-interval is comparable with Lower Aptian δ13C stage C7. Thus, conditions of oxygen depletion at this site also occurred after Oceanic Anoxic Event-1a, which developed between carbon isotope stages C3 and C6. Both sites, Madotz and Curití, attest to the importance of terrigenous and nutrient fluxes in increasing OM productivity that led to episodic oxygen deficiency.

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La creatividad no es un don, es una habilidad que puede ser desarrollada o despertada en los sujetos. La creatividad es una habilidad en el pensamiento que implica el manejo y la transformación del conocimiento y su posibiidad de ser traducido en distintos lenguajes (verbal, no verbal, visual, auditivo, etc). El presente trabajo investigativo y de aplicación práctica tiene como eje central la creatividad, como un proceso de pensamiento por desarrollar en los estudiantes de Humanidades de distintas facultades de la Universidad del Rosario. Este proceso incluye los siguientes pasos: acercamiento al conocimiento, observación del conocimiento, reflexión del conocimiento, elaboración, comprensión, creación/creacción, construcción y producción del conocimiento.