Mercado de trabajo y condicionamiento por color de piel en grandes centros urbanos de la Argentina

La discriminación por aspecto físico, y más en particular, el trato diferenciado hacia personas cuyos rasgos remiten a un origen entendido como indígena o no-europeo, constituye un problema escasamente tratado en los estudios de la desigualdad en la Argentina. Esta carencia, sumada a la falta de una articulación en las explicaciones de estos mecanismos relacionados con las desigualdades derivadas de las condiciones de clase, con frecuencia opacan el estudio del fenómeno profundizando sus efectos de invisibilidad. En este sentido, se mantienen ocultas las dificultades que afrontan quienes poseen estos rasgos para sobreponerse a prejuicios que reeditan cotidianamente principios racistas que asocian los rasgos nativos con la delincuencia, la falta de capacidades y saberes y, en términos generales, con la inferioridad socialmente entendida. En este artículo se investiga la incidencia del trato desigual basado en el aspecto físico -en particular, en el color de piel- sobre los logros laborales en una muestra de 2.500 personas de grandes centros urbanos de la Argentina en el año 2007. La discriminación por rasgos físicos, como efecto de la persistencia de principios operativos basados en la racialización de las interacciones sociales, pone de manifiesto la continuidad de principios jerárquicos, simbólicos y materiales que obstruyen la posibilidad de una mayor igualdad en el desarrollo cotidiano de las condiciones de vida de las personas

Imaginería del color en Petronio : De la Myrtea Gausapa (21-2) al Myrthus Florens (131.9)

El uso de imágenes ubica al Satiricón de Petronio como una obra de intersección (canón, cardo) entre la literatura antigua precedente griega y latina, y las composiciones posteriores de gran importancia en el surgimiento de la ficción en prosa moderna en el Renacimiento. Las imágenes visuales y de color en Petronio contribuyen notablemente a esa configuración, mientras que un estudio del léxico correspondiente, a partir en especial de las ediciones humanísticas de la obra, pueden sin duda arrojar luz sobre aspectos textuales aún no resueltos en esa obra maestra de la literatura latina

ODP Site 162-980 age model and color reflectance record of sediments from ODP Leg 162 sites

Sediment spectral reflectance measurements were generated aboard the JOIDES Resolution during Ocean Drilling Program Leg 162 shipboard operations. The large size of the raw data set (over 1.3 gigabytes) and limited computer hard disk storage space precluded detailed analysis of the data at sea, although broad band averages were used as aids in developing splices and determining lithologic boundaries. This data report describes the methods used to collect these data and their shipboard and postcruise processing. These initial results provide the basis for further postcruise research.

Chlorophyll and true-color maps of sediments from the intertidal zones in Winyah Bay, South Carolina, USA and List, Sylt, Germany

We used hyperspectral imaging to study short-term effects of bioturbation by lugworms (Arenicola marina) on the surficial biomass of microphytobenthos (MPB) in permeable marine sediments. Within days to weeks after the addition of a lugworm to a homogenized and recomposed sediment, the average surficial MPB biomass and its spatial heterogeneity were, respectively, 150 - 250% and 280% higher than in sediments without lugworms. The surficial sediment area impacted by a single medium-sized lugworm (~4 g wet weight) over this time-scale was at least 340 cm**2. While sediment reworking was the primary cause of the increased spatial heterogeneity, experiments with lugworm-mimics together with modeling showed that bioadvective porewater transport from depth to the sediment surface, as induced by the lugworm ventilating its burrow, was the main cause of the increased surficial MPB biomass. Although direct measurements of nutrient fluxes are lacking, our present data show that enhanced advective supply of nutrients from deeper sediment layers induced by faunal ventilation is an important mechanism that fuels high primary productivity at the surface of permeable sediments even though these systems are generally characterized by low standing stocks of nutrients and organic material.

High resolution color reflectance and hematite and goethite record of ODP Hole 184-1143A in the South China Sea

Precipitation has a larger variability than temperature in tropical monsoon regions, thus it is an important climate variable. However, reconstructions of long-term rainfall histories are scarce because of the lack of reliable proxies. Here we document that iron oxide minerals, specifically the ratio of hematite to goethite (Hm/Gt), is a reasonable precipitation proxy. Using diffuse reflectance spectrophotometry, we measured samples from Ocean Drilling Program (ODP) 1143 drilling site (9°21.72'N, 113°17.11'E, 2777 m water depth) for hematite and goethite, whose formation processes are favored by opposing climate conditions. In order to determine the content of hematite and goethite we produced a set of calibration samples by removing the iron oxides to generate the natural matrix to which hematite and goethite in known percentages were added. From these calibration samples we developed a transfer function for determining hematite and goethite concentration from a sample's spectral reflectance. Applying this method to ODP 1143 sediments (top 34 m of a 510 m core with sampling interval of 10 cm) we were able to reconstruct a continuous precipitation history for SE Asia of the past 600 kyr using the Hm/Gt ratio as a proxy of the precipitation variability of Asian monsoon. The reliability of this Hm/Gt proxy is corroborated by its consistency with the stalagmite delta18O data from South China. Comparing long-term Hm/Gt records with the surface temperature gradient of equatorial Pacific Ocean, we found that monsoon precipitation and El Niño are correlated for the last 600 kyr. The development of El Niño-like conditions decreased SE Asia precipitation, whereas precipitation increases in response to La Niña intensification