Algunos ejemplos de influencia de los procesos antrópicos en el medio sedimentario : la ría de Huelva

En la confluencia de las de sembocaduras de los ríos Odiel y Tinto, litoral suroeste de la Península Ibérica, se conforma un medio sedimentario de características mareales acusadas,\ud siendo el litoral de rango mesomareal.\ud Se describen los efectos derivados de tres construcciones antrópicas en la ría de Huelva. Las salinas de isla Bacuta han propiciado la hipersalinización del entorno. El dique\ud de contención de arenas del puerto de Huelva ha aumentado la velocidad de los ciclos mareales\ud y la contención de los ganchos arenosos, favoreciendo también la instalación de un medio\ud de playa en la cara expuesta. Y las balsas de yeso, construidas para albergar residuos industriales,\ud han destruido totalmente las zonas de marismas.At the Odiel and Tinto river mouths, Southwetern Iberian Peninsula, a tidal sedimentary environment is constituted, being the tidal range mesotidal. Three antropic builds up and its derived influences are desctibed. So that, the\ud Bacuta island salinas has produced the salt increasing of the geographic context. The bank\ud of Huelva port has modified the time/velocity relation in the tidal cycles, as well the stopping\ud of bar sands and the generation of a beach environment at the external face of this\ud bank. And the presence of gypsum, safts, to storing industrial residues, has completely destroyed\ud the marsh environments

Intersectionality in Psychology: Translational Science for Social Justice

Intersectionality is an analytic tool for studying and challenging complex social inequalities at the nexus of multiple systems of oppression and privilege, including race, gender, sexuality, social class, nation, age, religion, and ability. Although the term has become widely used in psychology, debates continue and confusion persists about what intersectionality actually is and how best to take an intersectional approach to psychological science. This special issue of Translational Issues in Psychological Science on intersectionality includes a range of methodological tools and theoretical perspectives that advance psychological research on intersectionality. In particular, these projects constitute psychological research that takes intersectionality’s political aspirations seriously and envisions psychology as a tool for social justice. The articles model responsible use of intersectionality through citation practices that reflect intersectionality’s origins in Black feminist thought and women of color scholar-activism, as well as through analyses that reflect intersectionality’s commitment to reflexivity, structural critique, and complexity. In this introduction, the editors reflect on intersectionality’s challenge to psychology and consider the place of translational science amid global crises and what critical psychologist Michelle Fine calls “revolting times.

Nullification functors and the homotopy type of the classifying space for proper bundles

Let G be a discrete group for which the classifying space for proper G-actions is finite-dimensional. We find a space W such that for any such G, the classifying space PBG for proper G-bundles has the homotopy type of the W-nullification of BG. We use this to deduce some results concerning PBG and in some cases where there is a good model for PBG we obtain information about the BZ/p-nullification of BG.Comment: Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol5/agt-5-46.abs.htm

Algunos ejemplos de influencia de los procesos antrópicos en el medio sedimentario : la ría de Huelva

En la confluencia de las de sembocaduras de los ríos Odiel y Tinto, litoral suroeste de la Península Ibérica, se conforma un medio sedimentario de características mareales acusadas, siendo el litoral de rango mesomareal. Se describen los efectos derivados de tres construcciones antrópicas en la ría de Huelva. Las salinas de isla Bacuta han propiciado la hipersalinización del entorno. El dique de contención de arenas del puerto de Huelva ha aumentado la velocidad de los ciclos mareales y la contención de los ganchos arenosos, favoreciendo también la instalación de un medio de playa en la cara expuesta. Y las balsas de yeso, construidas para albergar residuos industriales, han destruido totalmente las zonas de marismas.At the Odiel and Tinto river mouths, Southwetern Iberian Peninsula, a tidal sedimentary environment is constituted, being the tidal range mesotidal. Three antropic builds up and its derived influences are desctibed. So that, the Bacuta island salinas has produced the salt increasing of the geographic context. The bank of Huelva port has modified the time/velocity relation in the tidal cycles, as well the stopping of bar sands and the generation of a beach environment at the external face of this bank. And the presence of gypsum, safts, to storing industrial residues, has completely destroyed the marsh environments

Determinação de cronograma de manutenção preventiva utilizando algoritmo genético

Este artigo propõe um método para otimização do cronograma de manutenção preventiva com vistas à minimização dos custos associados. Dados de falhas são coletados e modelados através de distribuições de probabilidades paramétricas. Na sequência, geram-se índices de melhoria associados aos incrementos de confiabilidade decorrentes das manutenções, valendo-se do conhecimento de especialistas de processo, conforme Tsai et al. (2001). Tais índices são integrados a formulações quantificadoras do custo incorrido pelos procedimentos de manutenção. A formulação é otimizada através de Algoritmo Genético (AG), determinando o melhor tipo de manutenção (por exemplo, manutenção total ou parcial) a ser realizada em intervalos pré-definidos. Ao ser aplicado em uma máquina de transformação de bobinas de aço plano em tubos, o método gerou um cronograma coerente de manutenções com base na avaliação de especialistas de processo, além de reduzir em 20% os custos comparados à programação empírica de manutenção. Os resultados ainda comprovam a eficiência de AGs na resolução de problemas de manutenção por conta de sua rápida convergência e fácil implementação

Algunos aspectos de las relaciones fitoedáficas de los ecosistemas de Sierra Elvira (Granada). I: Zonales: Encinares, Coscojares, Piornales y Pastizales Vivaces

Con este trabajo se inicia el estudio de los suelos, la vegetación y sus relaciones con diversas especies vegetales de interés medicinal en los ecosistemas zonales de Sierra Elvira (Granada). Este primer avance se concreta en los encinares, coscojares, piornales y pastizales vivaces. Para la caracterización de los ecosistemas en sus aspectos suelo y planta, se han muestreado y analizado dos perfiles modales de suelo, uno bajo piornal y otro bajo encinar, y se han realizado diversos inventarios florísticos. En cada zona se han recogido y analizado las plantas con un posible efecto medicinal. Los suelos son de espesor moderado, textura arcilloso-esquelética, con elevado contenido de carbono orgánico (C/N de 12 a 14) y complejo de cambio saturado en bases (carbonatos libres y pH cercano a 8). Se diferencian entre sí por el desarrollo, estando más evolucionado el suelo bajo encinar. Se clasifican como Rendzinas. A nivel vegetación, Sierra Elvira pertenece en su totalidad a la serie mesomediterránea bética y marianico-monchiquense basifilia de la encina. La vegetación potencial está constituida por encinares de la asociación PaeonioQuercetum rotundifoliae.In this paper is carried out the study of soils and vegetation and their relationships with the different medicinal plant species in the zonal ecosystem of Sierra Elvira (Granada, Spain). Firstly Holm-oak woods, Kermes-oak woods, Brooms and Perennial pastures are studied. To determine the different ecosystems being in the area referring to soil and plant, two mode pro files of soil have been sampled an analysed, one of them under Kermes-oak and the other under Holm-oak, and severa! flowery inventories have been carried out. Plants with a possible medicinal effect have been collected and analyzed in every studied area. Soils can be described as follows: moderately thickness, clayey-skeletal particle-size classes, high organic carbon content (C/N 12-14) and saturated exchange-complex (free carbonates and approximately 8 pH). The difference between them is their development, being more developed the soils under Holm-oak woods. They are classifies as Rendinzas. Sierra Elvira according to its vegetation is totally included in the mesomediterranean betica and marianico-monchiquense Holm-oak serie. The potential vegetation consists of Holm-oak woods of Poeonio-Quercetum rotundi­ ¡olioe association. The medicinal or possibly medicinal plants are very numerous in these ecosystems. Among them the Asphode/us o/bus Miller subesp. o/bus is distinguished because of its high content in antraquinons. Soil and vegetation relationschips are complex due to two reasons: firstly strong anthropic actions which has deeply modified vegetation and soils, and secondly soils relationships with different factors such as relief, parent material and tim

Impacts of a hydroinfiltrator rainwater harvesting system on soil moisture regime and groundwater distribution for olive groves in semi-arid Mediterranean regions

Dry periods in semi-arid regions constitute one of the greatest hazardous features that agriculture faces. This study investigates the effects of using a new device called ‘Hydroinfiltrator Rainwater Harvesting System (HRHS) on the water balance of soils. It was designed for arid and semi-arid zones affected by long periods of drought punctuated by heavy rainstorms. The new hydroinfiltrator consists of a net-like shell filled mainly with biochar. It is cylindrical in shape, is placed vertically and is half-buried in the soil around the crop tree to facilitate the infiltration of rainwater, irrigation or runoff water deep into the soil. The experimental plot is located in Baena (Córdoba, southern Spain) in an olive grove where the hydroinfiltrator was installed in 90 olive trees while 10 were left as a control group. In the xeric climate (bordering on arid), typical of the region, soils without a hydroinfiltrator have had a low infiltration rate, which reduces the effectiveness of precipitation and significantly increases the risk of water erosion. The effects of infiltration assisted by the device were analysed by simulating a torrential rain in which 600 L of water were passed through the hydroinfiltrator on an olive tree which had been installed 3 years previously. Geophysical methods (electrical resistivity tomography, ERT), direct analyses of soil samples, both in situ and in the laboratory, and theoretical flow models indicated a very significant increase in soil moisture (which nearly tripled in respect to the control group) because water was absorbed into the soil quickly, preventing runoff and water erosion. The soil moisture at 20 cm depth was 2.97 times higher with the HRHS than in the control plots. In addition, olive production increased by 211% and was higher in fat yield by 177%. Moreover, the resistivity profiles, taken by ERT showed that the water that entered the soil accumulated in the root zone of the olive tree, encouraged by the preferential pathways created by the roots and away from the surface, which prevented rapid evaporation during the high temperatures of spring and summer. Here we show for the first time that the use of the hydroinfiltrator rainwater harvesting system represents a significant improvement in the use of scarce water resources caused by climate change, providing agronomic and environmental benefits for rainfed, Mediterranean agricultural systems

Defective minor spliceosome mRNA processing results in isolated familial growth hormone deficiency

The molecular basis of a significant number of cases of isolated growth hormone deficiency remains unknown. We describe three sisters affected with severe isolated growth hormone deficiency and pituitary hypoplasia caused by biallelic mutations in the RNPC3 gene, which codes for a minor spliceosome protein required for U11/U12 small nuclear ribonucleoprotein (snRNP) formation and splicing of U12-type introns. We found anomalies in U11/U12 di-snRNP formation and in splicing of multiple U12-type introns in patient cells. Defective transcripts include preprohormone convertases SPCS2 and SPCS3 and actin-related ARPC5L genes, which are candidates for the somatotroph-restricted dysfunction. The reported novel mechanism for familial growth hormone deficiency demonstrates that general mRNA processing defects of the minor spliceosome can lead to very narrow tissue-specific consequences.Peer reviewe