Problemática asociada a los cambios de uso del suelo : zona irrigada del Departamento de San Rafael, Mendoza

El Departamento de San Rafael, se encuentra en un territorio de alta fragilidad por las características que posee. Los cambios en el uso del suelo en este tipo de zonas causan diversos problemas y conflictos con los componentes del territorio. Los objetivos del trabajo son analizar los cambios de uso del suelo y la relación con la legislación vigente y describir la problemática asociada. A través del análisis espacial con Google Earth se ha realizado relevamientos de zonas con cambio de uso del suelo. En el Departamento, el abandono de fincas debido a la situación crítica que sufre el sector agrícola ha traído aparejada consecuencias negativas en la red de riego y un cambio de uso del suelo creciente hacia usos residenciales y turísticos. El recurso hídrico es uno de los factores más afectados tanto en su uso como distribución.The Department of San Rafael, is a territory of high fragility by the characteristics that it possesses. Changes in land use in areas of high environmental fragility cause various problems and conflicts with the components of the territory. The objectives of this work are to analyze changes in land use and the relationship with current legislation and describe the associated problems. Through the spatial analysis with Google Earth has been made surveys of areas with land use change. In the Department, the abandonment of the farms by a critical situation that suffers the agricultural sector. This has brought about the appearance of negative consequences on red irrigation, a change of land use for residential and tourist uses. The water resource is one of the factors most affected both in its use and distribution.Fil: Guajardo, Adriana B.. Universidad Nacional de Cuyo. Facultad de Ciencias Aplicadas a la IndustriaFil: Alcantú, Stella M.. Universidad Nacional de Cuyo. Facultad de Ciencias Aplicadas a la IndustriaFil: Giaroli, Gisela Natali. Universidad Nacional de Cuyo. Facultad de Ciencias Aplicadas a la IndustriaFil: Rodríguez, María B.. Universidad Nacional de Cuyo. Facultad de Ciencias Aplicadas a la IndustriaFil: Vega, Gustavo. Universidad Nacional de Cuyo. Facultad de Ciencias Aplicadas a la Industri

Relación entre las concentraciones de polen aéreo de Artemisia, Chenopodiaceae, Plantago y Taraxacum y la prevalencia de polinosis en estudiantes universitarios de León

XV lnternational A.P.L.E. Symposium of Palynolog

Estilo de vida y estado de nutrición en niños escolares

ResumenObjetivoRelacionar el estilo de vida y el estado de nutrición en escolares.MétodoEstudio correlacional, participaron 260 niños adscritos a la Clínica ISSSTE, elegidos aleatoriamente. Se utilizó el cuestionario sobre estilos de vida en la niñez y se valoró el peso y talla. Se obtuvo la aprobación de la Jefatura de Investigación del ISSSTE. En el análisis de datos se aplicó estadística descriptiva e inferencial.ResultadosParticiparon 137 niños y 123 niñas, con edades entre 6-12 años. Respecto al estado de nutrición, 5 de cada 10 de los participantes se encuentran en peso normal, 2 de cada 10 en sobrepeso y uno de cada 10 en obesidad y peso bajo. Sobre el estilo de vida 7 de cada 10 de los participantes se encontraron en riesgo bajo y 2 de cada 10 en riesgo mediano. Por otra parte, no se encontró relación entre el estilo de vida de los niños y su estado de nutrición (rs=0.038, p>0.05). Adicionalmente, se encontró que los niños con peso normal o bajo peso tienen mejores hábitos de sueño que los niños con sobrepeso u obesidad (U=3.79, p<0.001).ConclusionesEste estudio muestra indicios de que los aspectos vinculados con la dimensión psicocorporal y con uso del tiempo libre deberían indagarse a mayor profundidad, ya que fueron los que arrojaron cifras que ubican a los escolares en riesgo medio y alto.AbstractObjectiveTo explore the association between lifestyle and nutritional status among school children.MethodCorrelational study involving 260 children registered at an ISSSTE clinic, who were randomly selected. A questionnaire on childhood lifestyles was used; weight and height were also assessed. A project approval from the ISSSTE research committee was obtained. Descriptive and inferential statistics were used.Results137 boys and 123 girls with ages between 6 and 12 years old participated. In relation to the nutrition status, five out every ten have a normal weight; two out every ten are over weighted, and one out of every ten is obese or under weighted respectively. In relation to lifestyle, seven out of every ten participants have low risk; and two out of every ten have medium risk. On the other hand a relation between the lifestyle and nutritional status of the children was not found (rs=.038, p>0.05). Moreover, it was found that children with normal or low weights have better sleep habits in comparison to the children who are over weighted or obese U=3.79, p <.001).ConclusionsThis study suggests that issues related to the psychological and corporal dimensions, as well as the use of free time, should be further explored because they showed figures which place children within mid and high risks

PHF2 regulates homology-directed DNA repair by controlling the resection of DNA double strand breaks

Post-translational histone modifications and chromatin remodelling play a critical role controlling the integrity of the genome. Here, we identify histone lysine demethylase PHF2 as a novel regulator of the DNA damage response by regulating DNA damage-induced focus formation of 53BP1 and BRCA1, critical factors in the pathway choice for DNA double strand break repair. PHF2 knockdown leads to impaired BRCA1 focus formation and delays the resolution of 53BP1 foci. Moreover, irradiation-induced RPA phosphorylation and focus formation, as well as localization of CtIP, required for DNA end resection, to sites of DNA lesions are affected by depletion of PHF2. These results are indicative of a defective resection of double strand breaks and thereby an impaired homologous recombination upon PHF2 depletion. In accordance with these data, Rad51 focus formation and homology-directed double strand break repair is inhibited in cells depleted for PHF2. Importantly, we demonstrate that PHF2 knockdown decreases CtIP and BRCA1 protein and mRNA levels, an effect that is dependent on the demethylase activity of PHF2. Furthermore, PHF2-depleted cells display genome instability and are mildly sensitive to the inhibition of PARP. Together these results demonstrate that PHF2 promotes DNA repair by homologous recombination by controlling CtIP-dependent resection of double strand breaks.España Ministerio de Ciencia e Innovacion SAF2016-80626-REspaña, Fundación Canaria Instituto de Investigación Sanitaria de Canarias (FIISC) [PIFUN16/18

Mechanisms of refractive index modification during femtosecond laser writing of waveguides in alkaline lead-oxide silicate glass

3 pages, 3 figures.We report on the mechanisms responsible for the formation of optical waveguides upon femtosecond laser irradiation of an alkaline lead-oxide silicate glass. MicroRaman spectroscopy and nonlinear fluorescence were employed to probe the local glass network structure and the formation of optically active defects respectively. At low laser pulse energies, the laser modified region is formed by a single light guiding region, whereas for pulses above 14 µJ the modified region is formed by a central dark zone, which does not guide light, accompanied by light guiding zones located in the surrounding of the dark one. This behavior is different from that observed in common silica glass systems but agrees with recent results obtained in phosphate and heavy metal oxide glasses. However, our results show that, unlike the latter glass, local densification of the glass occurs in the whole laser modified region, i.e., in the dark and the guiding zones. The suppression of light guiding in the dark region is explained by a high density of absorbing color centers.This work was partially supported by CICYT (Spain) under Project No. DPI2002-00151. One of the authors (V.D.B.) acknowledges the financial support of the CSIC and the European Social Fund through an I3P Ph.D. fellowship. Another author (P.L.-A. acknowledges funding from the Spanish Government ( the Ramón y Cajal program and Grant No. TIC2003-07485).Peer reviewe

Plastic adjustments in xylem vessel traits to drought events in three Cedrela species from Peruvian Tropical Andean forests

Cedrela species occur within the Tropical montane cloud forest (TMCF) and rainforest in North America (Mexico), Central and South America. We assessed the hypothesis that functional xylem hydraulic architecture might be influenced by specific climatic variations. We investigated the effect of climate on tree-ring width and vessel traits (diameter, vessel density, vulnerability index and hydraulic diameter) of three relict-endemic and threatened Cedrela species (Cedrela fissilis, C. nebulosa and C. angustifolia) inhabiting Peruvian Tropical Andean cloud forests. All Cedrela species showed a significant reduction in radial growth and adjusted vessel trait linked with temperature, precipitation, and evapotranspiration. Ring-width and vessel traits showed adaptation within Cedrela species, crucial to understanding a rough indication of the plant’s ability to withstand drought-induced embolism or cavitation. Our results provide evidence for hydraulic mechanisms that determine specific wood anatomical functionality to climatic variation and drought responses. Therefore, changing the frequency or intensity of future drought events might exceed the adaptive limits of TMCF tree species, resulting in a substantial reduction of hydraulic functionality in Peruvian Cedrela species.Fil: Rodríguez Ramírez, Ernesto C.. Universidad Continental; PerúFil: Ferrero, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Acevedo-Vega, Ingrith. Universidad Continental; PerúFil: Crispin DelaCruz, Doris B.. Universidad Continental; Perú. Universidade Federal de Pernambuco; BrasilFil: Ticse Otarola, Ginette Vilma Alicia. Universidad Continental; Perú. Asociación ANDINUS; PerúFil: Requena Rojas, Edilson Jimmy. Universidad Continental; Per

Effect of animal mixing as a stressor on biomarkers of autophagy and oxidative stress during pig muscle maturation

The objective of this work was to study the postmortem evolution of potential biomarkers of autophagy (Beclin 1, LC3-II/LC3-I ratio) and oxidative stress (total antioxidant activity, TAA; superoxide dismutase activity, SOD and catalase activity, CAT) in the Longissimus dorsi muscle of entire male ((Large White × Landrace) × Duroc) pigs subjected to different management treatments that may promote stress, such as mixing unfamiliar animals at the farm and/or during transport and lairage before slaughter. During the rearing period at the farm, five animals were never mixed after the initial formation of the experimental groups (unmixed group at the farm, UF), whereas 10 animals were subjected to a common routine of being mixed with unfamiliar animals (mixed group at the farm, MF). Furthermore, two different treatments were used during the transport and lairage before slaughter: 10 pigs were not mixed (unmixed group during transport and lairage, UTL), whereas five pigs were mixed with unfamiliar animals on the lorry and during lairage (mixed group during transport and lairage, MTL). These mixing treatments were then combined into three pre-slaughter treatments – namely, UF-UTL, MF-UTL and MF-MTL. The results show that MF-UTL and MF-MTL increased significantly the muscle antioxidant defense (TAA, SOD and CAT) at short postmortem times (4 and 8 h; P < 0.001), followed by an earlier depletion of the antioxidant activity at 24 h postmortem (P < 0.05). We also found that mixing unfamiliar animals, both at the farm and during transport and lairage, triggers postmortem muscle autophagy, which showed an earlier activation (higher expression of Beclin 1 and LC3-II/LC3-I ratio at 4 h postmortem followed by a decreasing pattern of this ratio along first 24 h postmortem) in the muscle tissues of animals from the MF-UTL and MF-MTL groups, as an adaptive strategy of the muscle cells for counteracting induced stress. From these results, we propose that monitoring the evolution of the main biomarkers of autophagy (Beclin 1, LC3-II/LC3-I ratio) and muscle antioxidant defense (TAA, SOD, CAT) in the muscle tissue within the first 24 h postmortem may help the detection of animal stress and its potential effect on the postmortem muscle metabolism.info:eu-repo/semantics/publishedVersio

Photon Shielding Features of Quarry Tuff

Abstract. Cantera is a quarry tuff widely used in the building industry; in this work the shielding features of cantera were determined. The shielding characteristics were calculated using XCOM and MCNP5 codes for 0.03, 0.07, 0.1, 0.3, 0.662, 1, 2, and 3 MeV photons. With XCOM the mass interaction coefficients, and the total mass attenuation coefficients, were calculated. With the MCNP5 code a transmission experiment was modelled using a point-like source located 42 cm apart from a point-like detector. Between the source and the detector, cantera pieces with different thickness, ranging from 0 to 40 cm were included. The collided and uncollided photon fluence, the Kerma in air and the Ambient dose equivalent were estimated. With the uncollided fluence the linear attenuation coefficients were determined and compared with those calculated with XCOM. The linear attenuation coefficient for 0.662 MeV photons was compared with the coefficient measured with a NaI(Tl)-based �-ray spectrometer and a 137Cs source

The field high-amplitude SX Phe variable BL Cam: results from a multisite photometric campaign. II. Evidence of a binary - possibly triple - system

Short-period high-amplitude pulsating stars of Population I ($\delta$ Sct stars) and II (SX Phe variables) exist in the lower part of the classical (Cepheid) instability strip. Most of them have very simple pulsational behaviours, only one or two radial modes being excited. Nevertheless, BL Cam is a unique object among them, being an extreme metal-deficient field high-amplitude SX Phe variable with a large number of frequencies. Based on a frequency analysis, a pulsational interpretation was previously given. aims heading (mandatory) We attempt to interpret the long-term behaviour of the residuals that were not taken into account in the previous Observed-Calculated (O-C) short-term analyses. methods heading (mandatory) An investigation of the O-C times has been carried out, using a data set based on the previous published times of light maxima, largely enriched by those obtained during an intensive multisite photometric campaign of BL Cam lasting several months. results heading (mandatory) In addition to a positive (161 $\pm$ 3) x 10$^{-9}$ yr$^{-1}$ secular relative increase in the main pulsation period of BL Cam, we detected in the O-C data short- (144.2 d) and long-term ($\sim$ 3400 d) variations, both incompatible with a scenario of stellar evolution. conclusions heading (mandatory) Interpreted as a light travel-time effect, the short-term O-C variation is indicative of a massive stellar component (0.46 to 1 M_{\sun}) with a short period orbit (144.2 d), within a distance of 0.7 AU from the primary. More observations are needed to confirm the long-term O-C variations: if they were also to be caused by a light travel-time effect, they could be interpreted in terms of a third component, in this case probably a brown dwarf star ($\geq$ 0.03 \ M_{\sun}), orbiting in $\sim$ 3400 d at a distance of 4.5 AU from the primary.Comment: 7 pages, 5 figures, accepted for publication in A&