987 resultados para Ancrod:677


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Fil: Sampayo, María Azucena del Rosario. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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El presente trabajo tiene por objeto el estudio del comportamiento que adoptó el partido Socialista argentino frente a la Revolución Libertadora. Asimismo, el análisis de la postura que tuvo el periódico La Vanguardia, órgano oficial de aquel, acerca de uno de los acontecimientos emblemáticos del mencionado gobierno de facto, como lo fue el fusilamiento de militares y civiles que participaron de la sublevación de junio de 1956. Se verá, en primer término, cómo los socialistas caracterizaron el fenómeno peronista, para luego indagar acerca del modo en que actuaron durante el período siguiente a su derrocamiento, ocurrido en septiembre de 1955.

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Nuestra cultura, como otras, está convencida que debe enseñar todo al niño. Que debe sentarlo, pararlo y hacerlo caminar pues de otra manera, no lo aprenderá. La experiencia de más de 100 años de la Dra. Pikler (Budapest), más de 30 años en Argentina y más de 10 años en La Plata nos demuestra no solo que no es necesario enseñarles todo, sino que haciéndolo por ellos mismos logran un desarrollo postural armonioso, distendido, con una relación social diferente, con una actitud abierta al entorno y un desarrollo intelectual apoyado en el respeto por el equilibrio y la concentración. El desarrollo de la atención que se logra en estos primeros años de vida, se ve favorecido gracias al respeto por los tiempos de juego que el adulto aprende a tener, preparando el espacio, los objetos, observando y valorando las potencialidades y satisfaciendo las necesidades en la medida que aparecen. El adulto cambia su mirada y su actitud, logrando una relación vincular profunda durante los cuidados cotidianos y respetando las actividades autónomas.

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Nuestra cultura, como otras, está convencida que debe enseñar todo al niño. Que debe sentarlo, pararlo y hacerlo caminar pues de otra manera, no lo aprenderá. La experiencia de más de 100 años de la Dra. Pikler (Budapest), más de 30 años en Argentina y más de 10 años en La Plata nos demuestra no solo que no es necesario enseñarles todo, sino que haciéndolo por ellos mismos logran un desarrollo postural armonioso, distendido, con una relación social diferente, con una actitud abierta al entorno y un desarrollo intelectual apoyado en el respeto por el equilibrio y la concentración. El desarrollo de la atención que se logra en estos primeros años de vida, se ve favorecido gracias al respeto por los tiempos de juego que el adulto aprende a tener, preparando el espacio, los objetos, observando y valorando las potencialidades y satisfaciendo las necesidades en la medida que aparecen. El adulto cambia su mirada y su actitud, logrando una relación vincular profunda durante los cuidados cotidianos y respetando las actividades autónomas.

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Fil: Sampayo, María Azucena del Rosario. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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El presente trabajo tiene por objeto el estudio del comportamiento que adoptó el partido Socialista argentino frente a la Revolución Libertadora. Asimismo, el análisis de la postura que tuvo el periódico La Vanguardia, órgano oficial de aquel, acerca de uno de los acontecimientos emblemáticos del mencionado gobierno de facto, como lo fue el fusilamiento de militares y civiles que participaron de la sublevación de junio de 1956. Se verá, en primer término, cómo los socialistas caracterizaron el fenómeno peronista, para luego indagar acerca del modo en que actuaron durante el período siguiente a su derrocamiento, ocurrido en septiembre de 1955.

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Interstitial water samples from Sites 834 through 839, drilled during Ocean Drilling Program Leg 135 in the backarc Lau basin (Southwestern Pacific), have been analyzed for major elements, manganese, copper, strontium, barium, vanadium, and 87Sr/86Sr isotopic composition values. The concentration-depth profiles of the major chemical components show almost straight concentration gradients at all sites, and seem to reflect slight alteration of volcanic material. However, in the lower part of the sedimentary cover, where volcanogenic material is abundant and where diagenetic minerals occur, systematic decreases in calcium, strontium, manganese, copper, and vanadium concentrations are observed. A downwelling flow of bottom seawater, which affected the diagenetic chemical signature of the interstitial water, is probably responsible for the recorded chemical features. This hypothesis is supported by strontium isotope data obtained from interstitial water samples at Site 835. It is also in accordance with data from heat flow and physical properties.

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Distribution of Fe, Mn, Ti, Cu, Ni, Co, V, Cr, Mo, As in bottom sediments of a section from the Hawaiian Islands to the coast of Mexico. In the surface layer and isochronic layers of sediments from biogenic-terrigenous sediments of the Mexico coast to pelagic red clays of the Northeast Basin contents of all studied elements increase, and more sharply for mobile ones - Mn, Mo, Cu, Ni, Co, As. In near Hawaii sediments rich in coarsely fragmented volcanic-terrigenous and pyroclastic material of basalt composition enriched in Ti, Fe, Cr, V, P contents of these elements in surface sediments and in sediment mass increase and contents of Mn, Mo, Ni, Co, Cu, As (for the same reason) decrease compared to red clays. An area of hemipelagic and transition sediments is identified; these sediments have much higher contents of Mn, Fe, Cu, Ni, Mo, As, (Ba) than red clays and similar sediments of the Northwest Pacific Ocean. This is due to hydrothermal activity in the tectonically active zone at the northern extension of the East Pacific Rise. Similar character of distribution of the elements in the surface layer and in the isochrone layers of bottom sediments along the most part of the section is shown. Similarity between distribution of the elements in sediments of the western and the eastern parts of the Transpacific section is established.

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High-resolution records (2 7 kyr) of Upper Pliocene Discoaster abundances obtained from six ODP/DSDP sites are assessed independently using oxygen isotope stratigraphy. Four Atlantic Ocean sites (DSDP Sites 552 and 607, and ODP Sites 659 and 662) comprise a transect from 56°N to 1°S and provide a record of latitudinal variations in Diseoaster biogeography. Low-latitude sites in the Atlantic (ODP Site 662), Pacific (ODP Site 677), and Indian (ODP Site 709) oceans provide additional information about variability in Discoaster abundance patterns within the equatorial region. A common chronology, based on the astronomical time scale developed for ODP Site 677, has been established for all the sites. By integrating oxygen isotope data and Discoaster abundance records at each site we are able to independently evaluate the temporal and spatial distribution of D. brouweri and D. triradiatus in the 500 kyr prior to the extinction of the discoasters near the base of the Olduvai subchron. Major decreases in abundance are evident during some of the more intense late Pliocene glacial events. In particular, glacial isotope stages 82, 96, 98 and 100 are associated with distinct abundance minima. At these times, large-scale changes in surface hydrographic conditions appear to have suppressed Discoaster numbers on a global scale. The increase in abundance of D. triradiatus, which precedes the extinction of the discoasters by around 200 kyr, may also be related to the intensification of environmental pressures that accompanied the build-up of Northern Hemisphere ice sheets during the late Pliocene. In spite of contrasting geographic and oceanographic settings, the various D. brouweri and D. triradiatus records are remarkably similar. This demonstrates that the acme and extinction events are excellent biostratigraphic datums. The simultaneous extinction of D. brouweri and D. triradiatus at 1.95 Ma were synchronous events at both a regional scale within the Atlantic, and on a global scale between the three major oceans. However, the start of the D. triradiatus acme appears to have been diachronous, occurring some 40 kyr earlier in the Atlantic than in the Indo-Pacific, and hence the stratigraphic usefulness of this datum is regional rather than global.

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From the equatorial Indian Ocean, carbonate-free portions of sediment samples of Paleocene to Miocene calcareous oozes and chalks from Sites 707, 709, and 711 were studied using X-ray diffraction measurements and the scanning electron microscope. Downhole variations in biogenic opal, quartz, barite, and clinoptilolite were investigated. The abundance patterns of these major mineral phases show several similarities and may be used for additional lithologic correlations. Variations in biogenic opal contents reflect biogenic silica productivity. Beside the general pattern, a succession in biogenic silica decrease through time is generally recorded since the Oligocene. This succession started earliest at northernmost Site 711 and latest at southernmost Site 707, including Site 709 within these two. Opal-A variations as well as the barite distribution may be influenced by the paleoposition of the sites in relation to the high-productivity zone, which today lies south of the equator. Authigenic clinoptilolite apparently formed in two different modes. In deeper sediment intervals, clinoptilolite was the last mineral phase formed associated with enhanced silica diagenesis. In late Oligocene to middle Miocene sediments, clinoptilolite was the only authigenic silica phase encountered where otherwise strong opal dissolution was observed. The sponge spicules showed special dissolution features probably related to microbiological activity. Silica concretions mainly composed of opal-CT and authigenic quartz occur in carbonate-rich environments and are formed during later diagenesis when burial depth causes the sediments to reach higher temperatures. Opal-CT concretions in carbonate-free siliceous oozes were found at Site 711 and are probably formed during an early stage of silica diagenesis.