Analysis of the start to the first hurdle in 110m hurdles at the IAAF World Athletics Championships Beijing 2015

The purpose of this study was to use observational analysis to evaluate the relationships between variables measured at the start of the men’s 110 hurdles event and race performance itself. Data were obtained for competitors in 2015 IAAF World Athletics Ch ampionships, in Beijing, China. The athletes’ start was quantified by reaction time and time to the first hurdle; their action over the first hurdle was quantified by the take - off distance (i.e., the distance from the last step to the first hurdle), the la nding distance, and the total distance in the air over the first hurdle. Regression analyses revealed that the combination of one measure of the start (either reaction time or time to the first hurdle) and the measure of propulsion over the first hurdle (d istance in air over the first hurdle) predicted performance (SEE = 0.23 s in the heats, SEE = 0.16 s in the semi - finals, SEE = 0.09 s in the finals). In addition, looking at performances in the finals, where all athletes with available data used a seven - st ep approach to the first hurdle, inclusion of stride length data improved the prediction somewhat (SEE = 0.07 s). The results demonstrate that a combination of a fast start, rapid acceleration, and strong drive over the first hurdle quantifiably explains a nd contributes to performance in the men’s 110 m hurdles at the highest level

Combined use of the GGSFT data base and on Board Marine Collected Data to Model the Moho Beneath the Powell Basin, Antarctica

The Powell Basin is a small oceanic basin located at the NE end of the Antarctic Peninsula developed during the Early Miocene and mostly surrounded by the continental crusts of the South Orkney Microcontinent, South Scotia Ridge and Antarctic Peninsula margins. Gravity data from the SCAN 97 cruise obtained with the R/V Hespérides and data from the Global Gravity Grid and Sea Floor Topography (GGSFT) database (Sandwell and Smith, 1997) are used to determine the 3D geometry of the crustal-mantle interface (CMI) by numerical inversion methods. Water layer contribution and sedimentary effects were eliminated from the Free Air anomaly to obtain the total anomaly. Sedimentary effects were obtained from the analysis of existing and new SCAN 97 multichannel seismic profiles (MCS). The regional anomaly was obtained after spectral and filtering processes. The smooth 3D geometry of the crustal mantle interface obtained after inversion of the regional anomaly shows an increase in the thickness of the crust towards the continental margins and a NW-SE oriented axis of symmetry coinciding with the position of an older oceanic spreading axis. This interface shows a moderate uplift towards the western part and depicts two main uplifts to the northern and eastern sectors

Inversion and allozyme polymorphism show contrasting patterns of microgeographical population structure in a natural population of Drosophila buzzatii from Argentina

Second chromosome inversions and genotypic frequencies at seven allozyme loci were determined in a natural population of the cactophilic species Drosophila buzzatii that uses as breeding sites the necrotic cladodes of the prickly pear Opuntia quimilo and the rotting stems of cardón, Trichocereus terschekii. Different processes govern the evolutionary fate of inversion and allozyme polymorphisms. A pattern of heterotic balance for inversions seems to be acting uniformly in each breeding site and could depend on different regimes of density-dependent selection within cactus hosts. Patterns of variation of allozymes revealed significant heterogeneity in allele frequencies for Esterase-1 (Est-1) among O. quimilo rots and Aldehyde oxidase (Aldox) and Xanthine dehydrogenase (Xdh) among T. terschekii substrates and showed gene-cactus effects only for Esterase-2 (Est-2). Consistent and significant excesses of homozygotes were detected at both the within-rot and in the total population levels that could be accounted for by diversifying selection among individual breeding sites.Fil:Fernández Iriarte, P.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Rodríguez, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Hasson, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina

Doping and temperature dependence of Mn 3d states in A-site ordered manganites

We present a systematic study of the electronic structure in A-site ordered manganites as function of doping and temperature. The energy dependencies observed with soft x-ray resonant diffraction (SXRD) at the Mn L_{2,3} edges are compared with structural investigations using neutron powder diffraction as well as with cluster calculations. The crystal structures obtained with neutron powder diffraction reflect the various orbital and charge ordered phases and show an increase of the Mn-O-Mn bond angle as function of doping and temperature. Cluster calculations show that the observed spectral changes in SXRD as a function of doping are more pronounced than expected from an increase in bandwitdh due to the increase in Mn-O-Mn bond angle, and are best described by holes that are distributed at the neighbouring oxygen ions. These holes are not directly added to the Mn 3d shell, but centered at the Mn site. In contrast, the spectral changes in SXRD as function of temperature are best described by an increase of magnetic correlations. This demonstrates the strong correlations between orbitals and magnetic moments of the 3d states

El imaginario managerial: El discurso de la fluidez en la sociedad económica

Este artículo intenta describir el denominado imaginario managerial, esto es, el conjunto de imágenes y representaciones míticas presentes en el discurso empresarial sobre las organizaciones. Estos elementos condensan distintas imágenes de la empresa y el trabajo, atribuyendo un sentido a la tarea misma de gestionar. Desde una perspectiva crítica, en este trabajo nos centraremos en los libros de gestión empresarial o literatura del management. En esta literatura no sólo se recogen de una manera nítida los ejes que articulan el imaginario social de los directivos de las empresas; además, examina su transformación histórica, en una transición desde un capitalismo sólido que enfatiza las jerarquías a otro líquido, basado en la fluidez y las redes.This article attempts to describe the so-called managerial imaginary, that is, the set of images and mythical representations present in the managerial discourse on organizations. These elements condense several images about labour and companies, confering a sense to the managing tasks. In this paper we will focus on the business books or management literature, from a critical approach. This literature does not just clearly highlight the axis that articulate the managers’ social imaginary. It also examines its historical transformation, in a transition from a solid capitalism which emphasizes hierarchies, to a liquid one based on fluidity and networks

Silvopastoral systems established with Pinus radiate D. Don and Betula pubescens Ehrh.: Tree growth, understorey biomass and vascular plant biodiversity

In the European Union, the majority of afforestation is carried out on former agricultural land. This afforestation causes fundamental changes in ecosystem structure and functioning, with the trees intercepting light and precipitation, producing litterfall and competing for soil nutrients. All of these effects could potentially have a negative impact on understorey biomass and vascular plant biodiversity in a relatively short time span. This study aims to evaluate the effects of afforestation with Pinus radiata D. Don (Monterey pine: pine) and Betula pubescens Ehrh. (Downy birch: birch), established at two different densities (2500 and 833 trees ha21) and sown with two different pasture mixtures (Dactylis glomerata L. + Trifolium repens L. + Trifolium pratense L. and Lolium perenne L. + T. repens L. + T. pratense L.), on understorey biomass, alpha plant biodiversity, life cycle type (annuals vs. perennials) and beta biodiversity over a period of 11 years. Pine showed better development than birch throughout the study, although both species were very sensitive to tree density. While increasing density increased pine height and decreased pine diameter, both aspects of birch development were reduced by higher tree densities. Aboveground biomass increased throughout the study. Alpha plant biodiversity was drastically reduced under pine established at high density, 11 years after afforestation. However, the similarities in species richness, species composition and the low beta growth rates found under pine at low density, and birch at both high and low density suggest that, in these cases, the choice of canopy tree has little consequence for understorey biodiversity at this stage of system development.info:eu-repo/semantics/publishedVersio

Three inquiries into the origin of Manchado de Jabugo pigs

Ponencia publicada en ITEA, vol.104El origen de la población Manchado de Jabugo se atribuye a cruces realizados en el siglo XIX entre cerdos Ibéricos negros y colorados. Se supone que animales de razas Large White y Berkshire contribuyeron además a fundar esta población, que ha permanecido aislada durante décadas en algunos pueblos de la Sierra de Aracena. El objetivo de este trabajo fue rastrear posibles huellas genéticas de las variedades y razas fundadoras en la población actual, conservada por la Diputación de Huelva. El ADN mitocondrial de animales Manchado de Jabugo y Large White presenta secuencias coincidentes tanto para la región de control D-loop, como para los genes Cyt b, ATPasa8, ATPasa6 y NADH5. La mutación IGF2 g.3072G>A, ocurrida en un cromosoma asiático, se detecta en la población Manchado, y está presente asimismo en Large White y Berkshire. Ello concuerda con la posible contribución fundacional de ambas razas británicas, en las que se introdujeron genes de origen asiático a partir del siglo XVIII. Finalmente, esta población presenta cuatro alelos del gen MC1R. El alelo MC1R*3 es característico de la variedad negra de cerdo Ibérico y del Large White. Los alelos MC1R*6 y MC1R*7 de la variedad colorada, y el primero también del Berkshire. La presencia del alelo MC1R*4, característico de la raza Duroc indica una contribución más reciente de esta otra raza foránea al germoplasma del Manchado de Jabugo.Animals born at the end of the XIX century from crosses between Red and Black Iberian pigs were the main founders of the black spotted population named Manchado de Jabugo. Pigs of the Large White and Berkshire breeds had also contributed to the foundation of this population, which was isolated for several decades in some villages of Huelva. Our objective was to verify the possible genetic traces of founder varieties and breeds in this population, preserved by the Diputación de Huelva. The mitochondrial DNA from Manchado and Large White animals shows identical sequences for the control region D-loop, and also for the Cyt b ATPase8, ATPase6 and NADH5 genes. The IGF2 g.3072G>A mutation, apparently occurred in an Asian chromosome, is also present in the Manchado population. Both results agree with the quoted founder contribution of two British breeds, because Asian germplasm was introgressed into these breeds from the XVIII century. Finally, four alleles of the MC1R gene are segregating in this small population. The MC1R*3 allele is characteristic of Black Iberian variety and Large White breed. The MC1R*6 and MC1R*7 alleles are characteristic of Red Iberian pigs, and the first one of the Berkshire pigs. The unexpected presence of the MC1R*4 allele, characteristic of Duroc, indicates the contribution of this breed to the current Manchado germplasm

Seasonal Variation of Crude Protein Content of Different Herbaceous, Shrub and Tree Species

Silvopastoralism is a sustainable way of land management that reduces fire risk due to the reduction of fuel under trees when plants are used as animal food. This is particularly important in areas like Galicia that have 16% of the fired area of Europe. Silvopastoral systems can contribute to environment conservation and provide feed for autochthonous breeds more adapted to mountain conditions, enhancing biodiversity conservation. In formation on seasonal changes in crude protein content of spontaneous species will indicate better management of pasture resources in mountain areas

Effect of Tree Species and Density on Pasture Production in Galicia, Spain

Galicia produces 50% of the forest products of Spain. Livestock production earns 62% of the income of the agrarian sector in Galicia. Afforestation has been very important in the last decade to such an extent that the area of forest and woodlands now covers 62% of Galicia. It is necessary to increase the rate of return on investments in planted forests in order to avoid rural depopulation through improvement of rural development and welfare. This paper reports on the effect of combining pastures with trees