885 resultados para Cofradía del Santísimo Cristo de San Salvador (Valencia)-Reglas, constituciones, etc


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Prólogo.--Patriotismo y cultura de unas juntas: como se inicia un museo.--Adquisición de objetos.--Apuntes para un catálogo.--El edificio.--Los fundadores del museo.--Epílogo.--Láminas.

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Pure limestones beneath the paleosols on San Salvador Island, Bahamas, contain strong positive magnetic susceptibility anomalies, although the iron content is generally very low. These magnetic phenomena differ from those associated with disconformities, which are marked by accumulation of paramagnetic airborne dust deposits with relatively high iron content. The strength and characters of the magnetic response in these subsurface zones correspond to the presence of magnetite, particularly small single-domain magnetite crystals of microbial origin. These crystals are not present elsewhere in the intergranular rock pores or microvugs. They are preferentially concentrated in capillary microborings, which developed concurrently with formation of calcite cements that have soil-related C and O isotope compositions. These magnetic zones occur several meters below the overlying soil horizons. Very thin and long linear microborings may be attributable to cyanobacterial microborers. The single-domain magnetites in these micrometer-size tunnels plugged by calcite appear to result from later occupation of these tiny holes by magnetotactic bacteria. Inorganic origin of the magnetite seems unlikely. Numerous traces that suggest subsurface microbial activity provide evidence that may be used to develop possible scenarios for subsequent biological studies of the precise bacteria involved.

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Fil: Lastra, María Soledad. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Fil: Lastra, María Soledad. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Fil: Lastra, María Soledad. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Programa de doctorado: Historiografía, Fuentes y Métodos de la Investigación Histórica. La fecha de publicación es la fecha de lectura

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Tesis (Ingeniero(a) Eléctrico).--Universidad de La Salle. Facultad de Ingeniería. Programa de Ingeniería Eléctrica, 2014