Myers, K.S. (ed.), Ovid Metamorphoses, Book XIV (Cambridge Greek and Latin Classics), Nueva York, Cambridge University Press, 2009, IX + 237 pp. ISBN 978-0-521-00793-1

Fil: Martínez Astorino, Pablo Leandro. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina.

Estructura organizativa del Sistema de Gestión Integral de Documentos de archivo (SiGeID 1.0)

El nuevo contexto impone a las organizaciones la necesidad vital de disponer de adecuadas infraestructuras de comunicación, que les permitan conseguir un conocimiento real y suficiente del entorno. El presente artículo pretende mostrar la estructura organizativa del Sistema de Gestión Integral de Documentos de archivo SiGeID (1.0), como una herramienta informática que ayuda a las organizaciones empresariales al perfeccionamiento de la gestión de documentos. Dividido en tres módulos: Gestión y Seguridad Documental, Gestión de Archivo y Administración y Configuración, se tienen en cuenta además sus requerimientos funcionales y no funcionales

Age determination, sedimentological, biogeochemical, and plant macrofossils analyses of outcrop PG2038-1

Thermokarst lakes are a widespread feature of the Arctic tundra, in which highly dynamic processes are closely connected with current and past climate changes. We investigated late Quaternary sediment dynamics, basin and shoreline evolution, and environmental interrelations of Lake El'gene-Kyuele in the NE Siberian Arctic (latitude 71°17'N, longitude 125°34'E). The water-body displays thaw-lake characteristics cutting into both Pleistocene Ice Complex and Holocene alas sediments. Our methods are based on grain size distribution, mineralogical composition, TOC/N ratio, stable carbon isotopes and the analysis of plant macrofossils from a 3.5-m sediment profile at the modern eastern lake shore. Our results show two main sources for sediments in the lake basin: terrigenous diamicton supplied from thermokarst slopes and the lake shore, and lacustrine detritus that has mainly settled in the deep lake basin. The lake and its adjacent thermokarst basin rapidly expanded during the early Holocene. This climatically warmer than today period was characterized by forest or forest tundra vegetation composed of larches, birch trees and shrubs. Woodlands of both the HTM and the Late Pleistocene were affected by fire, which potentially triggered the initiation of thermokarst processes resulting later in lake formation and expansion. The maximum lake depth at the study site and the lowest limnic bioproductivity occurred during the longest time interval of ~7 ka starting in the Holocene Thermal Maximum and lasting throughout the progressively cooler Neoglacial, whereas partial drainage and an extensive shift of the lake shoreline occurred ~0.9 cal. ka BP. Correspondingly, this study discusses different climatic and environmental drivers for the dynamics of a thermokarst basin.

Myers, K.S. (ed.), Ovid Metamorphoses, Book XIV (Cambridge Greek and Latin Classics), Nueva York, Cambridge University Press, 2009, IX + 237 pp. ISBN 978-0-521-00793-1

Fil: Martínez Astorino, Pablo Leandro. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina.

Estructura organizativa del Sistema de Gestión Integral de Documentos de archivo (SiGeID 1.0)

El nuevo contexto impone a las organizaciones la necesidad vital de disponer de adecuadas infraestructuras de comunicación, que les permitan conseguir un conocimiento real y suficiente del entorno. El presente artículo pretende mostrar la estructura organizativa del Sistema de Gestión Integral de Documentos de archivo SiGeID (1.0), como una herramienta informática que ayuda a las organizaciones empresariales al perfeccionamiento de la gestión de documentos. Dividido en tres módulos: Gestión y Seguridad Documental, Gestión de Archivo y Administración y Configuración, se tienen en cuenta además sus requerimientos funcionales y no funcionales

Myers, K.S. (ed.), Ovid Metamorphoses, Book XIV (Cambridge Greek and Latin Classics), Nueva York, Cambridge University Press, 2009, IX + 237 pp. ISBN 978-0-521-00793-1

Fil: Martínez Astorino, Pablo Leandro. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Estructura organizativa del Sistema de Gestión Integral de Documentos de archivo (SiGeID 1.0)

El nuevo contexto impone a las organizaciones la necesidad vital de disponer de adecuadas infraestructuras de comunicación, que les permitan conseguir un conocimiento real y suficiente del entorno. El presente artículo pretende mostrar la estructura organizativa del Sistema de Gestión Integral de Documentos de archivo SiGeID (1.0), como una herramienta informática que ayuda a las organizaciones empresariales al perfeccionamiento de la gestión de documentos. Dividido en tres módulos: Gestión y Seguridad Documental, Gestión de Archivo y Administración y Configuración, se tienen en cuenta además sus requerimientos funcionales y no funcionales

(Table 1) Effects of desiccation on photochemical processes and nitrogenase activity in Nostoc commune s.l. colonies

The effects of desiccation on photochemical processes and nitrogenase activity were evaluated in Nostoc commune s.l. colonies in situ from a wet thufur meadow at Petuniabukta, Billefjorden, Central Svalbard, during the 2009 arctic summer. The colonies were collected in the fully hydrated state, and were subjected to slow desiccation at ambient temperatures (5 - 8°C) and low light (30 - 80 µmol/m**2/s). For each colony the weight, area, photochemical performance, and nitrogenase activity were determined at the beginning, as well as on every day during the first four days of the experiment; thereafter, on every second day until desiccation was complete. The photochemical performance was evaluated from variable chlorophyll fluorescence parameters (FV/FM, Phi(PSII) , qP, and NPQ), and the nitrogenase activity was estimated by an acetylene-ethylene reduction assay. A significant decrease in the photochemically active area was recorded from the third day, when the colony had lost approximately 40% of its original weight indicating some changes in the extracellular matrix, and stopped on the 14th to 18th day. No effects of the desiccation on the main photochemical parameters (FV/FM, Phi(PSII), qP) were observed up to the sixth to eighth days of desiccation. Slightly lower values of FV/FM and Phi(PSII) recorded in fully-hydrated colonies could be caused by impaired diffusion of CO2 into cells. The steep reduction of photochemical activity occurred between the eighth and tenth day of the experiment, when the colony had lost approximately 80% of its fully-hydrated weight. The nitrogenase activity was highest on the first day, probably due to improved diffusion of N2 into cells, then declined, but was detectable until the sixth day of the experiment. Since Nostoc commune s.l. colonies were capable of photosynthesis and nitrogen fixation to the level of ca. 60% of its fully-hydrated weight, even partly-hydrated colonies contribute substantially to carbon and nitrogen cycling in the High Arctic wet meadow tundra ecosystem.

(Table 1) Biomass (as energy) of different elements of the planktonic community in the Equatorial Pacific in the 0-150 m layer

An analysis was made of composition and content of nutrients, salts, particulate and dissolved organic matter, and various plankton groups in a series of samples collected by a 140-liter sampling bottle to depth up to 150 m at 4 equatorial stations between 97° and 154°W. Large and small phytoplankton, bacteria (aggregated and dispersed), heterotrophic flagellates, infusorians, radiolarians, foraminifers, fine filter-feeders, small and large, mostly herbivorous copepods, cyclopoids, predatory calanoids, and other predators were investigated separately. Trophic relations between these elements are established from personal and published data, and rate of their metabolism and some other physiological parameters are determined. Such functional characteristics as extent of satisfaction of food requirements of organisms belonging to various trophic groups, intensity of trophic relations, balance between production and consumption by individual elements of the community, ecological efficiency, and net and specific production of the groups distinguished, of individual trophic levels, of total zooplankton, and of the community as a whole are calculated. Variations of these characteristics along the equator with decreasing upwelling intensity are examined and their possible causes and mechanisms are discussed.