Search results for " ciencia"

Persistencia de residuos de disparo en puños de prendas de vestir

2013

La detección de partículas de residuos de disparo (RDD) en las ropas de un sospechoso es una evidencia muy importante en los casos judiciales para determinar si la persona disparó o no un arma de fuego. Sin embargo, debido a simples roces con otras superficies, las partículas asociadas al disparo se pierden por la actividad física de una persona. En este estudio se analizó la permanencia de los RDD retenidos sobre puños de prendas de vestir, luego de disparar una pistola calibre 9mm. Valiéndose de la técnica de Microscopía Electrónica de Barrido (SEM) combinada con Espectrometría de Energía Dispersiva (EDS) se caracterizó la morfología, composición y densidad de los RDD recolectados, tenien…

La sonrisa del éxito: figuraciones de una subjetividad exigida

2014

El presente artículo analiza cómo se afianza en la escena social la corporalidad del liderazgo. Para ello, aborda imágenes y narrativas que circulan en los entramados simbólicos de la cultura del bienestar, que también se denomina como cultura activa. El cuerpo del liderazgo se ofrece al público mediante estrategias positivas y negativas. Éstas, en la medida que encumbran el estilo de vida activo, demonizan aquellas prácticas que no responden a los valores sanitarios y productivos promulgados por el ethos empresarial emergente. Se concluye que la encarnación de una subjetividad emprendedora se impone paulatinamente como parámetro de integración de un individuo en los diagramas económicos y …

Exploring the Slow Relaxation of the Magnetization in CoIII -Decorated {DyIII 2 } Units

2016

We have prepared and structurally characterized a new member of the butterfly-like {CoIII 2DyIII 2} single-molecule magnets (SMMs) through further CoIIIdecoration, with the formula [CoIII 4DyIII 2(OH)2(teaH)2(tea)2(Piv)6] (teaH3=triethanolamine; Piv=trimethylacetate or pivalate). Direct current (DC) susceptibility and magnetization measurements were performed allowing the extraction of possible crystal-field parameters. A simple electrostatic modeling shows reasonable agreement with experimental data. Alternating current (AC) susceptibility measurements under a zero DC field and under small applied fields were performed at different frequencies (i.e., 10–1500 Hz) and at low temperatures (i.…

SMOS Level-2 Soil Moisture Product Evaluation in Rain-Fed Croplands of the Pampean Region of Argentina

2016

A field campaign was carried out to evaluate the Soil Moisture (SM) MIR-SMUDP2 product (v5.51) generated from the data of the Microwave Imaging Radiometer using Aperture Synthesis (MIRAS) aboard the Soil Moisture and Ocean Salinity (SMOS) mission. The study area was the Pampean Region of Argentina, which was selected because it is a vast area of flatlands containing quite homogeneous rain-fed croplands, which are considered SMOS nominal land uses and hardly affected by radio-frequency interference contamination. Transects of ground handheld SM measurements were performed using ThetaProbe ML2x probes within four Icosahedral Snyder Equal Area Earth (ISEA) grid nodes, where permanent SM statio…

Characterization of the Copper Transporters from Lotus spp. and Their Involvement under Flooding Conditions

2019

Forage legumes are an important livestock nutritional resource, which includes essential metals, such as copper. Particularly, the high prevalence of hypocuprosis causes important economic losses to Argentinian cattle agrosystems. Copper deficiency in cattle is partially due to its low content in forage produced by natural grassland, and is exacerbated by flooding conditions. Previous results indicated that incorporation of Lotus spp. into natural grassland increases forage nutritional quality, including higher copper levels. However, the biological processes and molecular mechanisms involved in copper uptake by Lotus spp. remain poorly understood. Here, we identify four genes that encode p…

Carbamazepine, cadmium chloride and polybrominated diphenyl ether-47, synergistically modulate the expression of antioxidants and cell cycle biomarke…

2019

Abstract A wide range of contaminants, industrial by-products, plastics, and pharmaceutics belonging to various categories, have been found in sea water. Although these compounds are detected at concentrations that might be considered as sub-lethal, under certain conditions they could act synergistically producing unexpected effects in term of toxicity or perturbation of biochemical markers leading to standard pathway. In this study, the Sparus aurata fibroblast cell line SAF-1, was exposed to increasing concentrations of carbamazepine (CBZ), polybrominated diphenyl ether 47 (BDE-47) and cadmium chloride (CdCl2) until 72 h, to evaluate the cytotoxicity and the expression of genes related to…

Diurnal timing of nonmigratory movement by birds: the importance of foraging spatial scales

2020

Timing of activity can reveal an organism's efforts to optimize foraging either by minimizing energy loss through passive movement or by maximizing energetic gain through foraging. Here, we assess whether signals of either of these strategies are detectable in the timing of activity of daily, local movements by birds. We compare the similarities of timing of movement activity among species using six temporal variables: start of activity relative to sunrise, end of activity relative to sunset, relative speed at midday, number of movement bouts, bout duration and proportion of active daytime hours. We test for the influence of flight mode and foraging habitat on the timing of movement activit…

Differential impact of marine debris ingestion during ontogenetic dietary shift of green turtles in Uruguayan waters

2018

Anthropogenic debris ingestion has been reported for green turtles in all their life stages worldwide. The aim of the present study is to evaluate the marine debris ingestion by green turtles stranded in Uruguayan coast between 2005 and 2013. Debris items were categorized and quantified by frequency of occurrence, relative weight, volume and number of items. A total of 96 dead stranded turtles were analyzed and 70% presented debris in their guts. The majority of debris found were plastic, being hard plastics the most abundant in weight. We found no differences in debris ingestion in stranded turtles a long the Uruguayan coast. However we detected a negative correlation between the presence …

De la botánica "inútil" a la ciencia aplicada. Simón de Rojas Clemente y Rubio

2015

UVER and UV index at high altitude in Northwestern Argentina

2016

Measurements of ultraviolet erythemal radiation (UVER) made during two years at three sites located at altitudes over 1000 m a.s.l. in Northwestern Argentina (Salta, San Carlos, and El Rosal) have been used to estimate and analyze the UV Index (UVI) and the cumulative doses at these locations. For the UVER irradiance, data of January (maximum values) and June (minimum values) have been analyzed as representative of the year for all locations. The UVI reaches extreme (> 11) values in > 20% of the analyzed days in Salta (1190 m a.s.l.), while these are reached in San Carlos (1611 m a.s.l.) and El Rosal (3355 m a.s.l.) in > 40% of the analyzed days. Finally, the cumulative doses over an averag…