(Table 1) K and Ar content, and age determination of ODP Holes 126-792E and 126-793B

Results of conventional K-Ar dating on five samples from two sites from the Izu-Bonin forearc are presented. Two samples recovered from a volcanic edifice and overlying sediments drilled on the western side of the forearc basin (Site 792) indicate a basement age of 34 Ma. This is consistent with early Oligocene biostratigraphic ages from the overlying sediments. Three samples from the basement of Hole 793B at the center of the basin are not analytically distinguishable, with a best age of 27.1 +/- 0.6 Ma. This is slightly younger than the 30-33 Ma biostratigraphic and magnetostratigraphic estimates from the overlying sediments, suggesting that alteration processes have lowered the apparent K-Ar ages. These ages suggest that syn-rift volcanism occurred in a forearc location during the middle Oligocene.

Violencia obstétrica. Un enfoque de derechos humanos

La presente publicación describe a detalle la situación actual en México respecto al fenómeno de la violencia obstétrica en los últimos tres años. Tras una investigación exhaustiva y gracias al apoyo de la Fundación Angélica Fuentes, el Grupo de Información en Reproducción Elegida presenta los resultados y las posibles soluciones a la violencia obstétrica, siempre pensando en las mujeres, pero a sabiendas que tanto el personal de salud como el Estado podrían resultar beneficiados

Parameters of population dynamics and energetics of ctenophore Mnemiopsis leidyi in Sevastopol Bay from January 1995 to March 1996

Population dynamics of abundance and biomass were studied and specific production of population of ctenophore Mnemiopsis leidyi was estimated in the Sevastopol Bay from January 1995 to March 1996. The ctenophores achieved maximum abundance and biomass in July during period of intensive reproduction. Young specimens (<5 mm) contributed during that period as much as 50-87% to total abundance of population. Annually averaged daily specific growth rate was 0.039. Growth, food consumption, and rate of filtration were measured in a laboratory under two concentrations of food (Acartia clausi and Moina micrura: 60 and 100 specimens per liter, 0.35 and 0.60 mg wet weight/l). Both concentrations sustained growth of animals with dry weight less than 20 mg. However these concentrations were insufficient to sustain growth of larger ctenophores. Specific growth rate of the ctenophores with dry weight <20 mg under favorable food conditions was 0.20-0.30 l/day. Specific growth rate of the ctenophores in the Sevastopol Bay never exceeded 0.093 l/day, mean biomass of fodder zooplankton in the bay being 90 mg/m**3 in terms of wet weight. Hence a conclusion was made that population of M. leidyi in the bay was limited by lack of food.

Horizontal profiles of longwave and shortwave radiation components over sea ice near Barrow, Alaska during the 2011 melt

An integrated instrument package for measuring and understanding the surface radiation budget of sea ice is presented, along with results from its first deployment. The setup simultaneously measures broadband fluxes of upwelling and downwelling terrestrial and solar radiation (four components separately), spectral fluxes of incident and reflected solar radiation, and supporting data such as air temperature and humidity, surface temperature, and location (GPS), in addition to photographing the sky and observed surface during each measurement. The instruments are mounted on a small sled, allowing measurements of the radiation budget to be made at many locations in the study area to see the effect of small-scale surface processes on the large-scale radiation budget. Such observations have many applications, from calibration and validation of remote sensing products to improving our understanding of surface processes that affect atmosphere-snow-ice interactions and drive feedbacks, ultimately leading to the potential to improve climate modelling of ice-covered regions of the ocean. The photographs, spectral data, and other observations allow for improved analysis of the broadband data. An example of this is shown by using the observations made during a partly cloudy day, which show erratic variations due to passing clouds, and creating a careful estimate of what the radiation budget along the observed line would have been under uniform sky conditions, clear or overcast. Other data from the setup's first deployment, in June 2011 on fast ice near Point Barrow, Alaska, are also shown; these illustrate the rapid changes of the radiation budget during a cold period that led to refreezing and new snow well into the melt season.

Geochemistry on Holocene sediments from the Mediterranean

The enhanced accumulation of organic matter in Eastern Mediterranean sapropels and their unusually low d15N values have been attributed to either enhanced nutrient availability which led to elevated primary production and carbon sequestration or to enhanced organic matter preservation under anoxic conditions. In order to evaluate these two hypothesis we have determined Ba/Al ratios, amino acid composition, N and organic C concentrations and d15N in sinking particles, surface sediments, eight spatially distributed core records of the youngest sapropel S1 (10-6 ka) and older sapropels (S5, S6) from two locations. These data suggest that (i) temporal and spatial variations in d15N of sedimentary N are driven by different degrees of diagenesis at different sites rather than by changes in N-sources or primary productivity and (ii) present day TOC export production would suffice to create a sapropel like S1 under conditions of deep-water anoxia. This implies that both enhanced TOC accumulation and d15N depletion in sapropels were due to the absence of oxygen in deep waters. Thus preservation plays a major role for the accumulation of organic-rich sediments casting doubt on the need of enhanced primary production for sapropel formation.

Autonomía - Equilibrio - Armonía de 0 a 3 años

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.

La desmanicomialización como práctica contrahegemónica en el abordaje de la salud mental

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

Los socialistas y la Revolución Libertadora. La Vanguardia y los fusilamientos de junio de 1956

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.