Diferencias biomecánicas entre jugadores principiantes y de alto rendimiento en el lanzamiento en salto en baloncesto

La valoración y el aprendizaje de la técnica del lanzamiento en salto en baloncesto están relacionados con el conocimiento de la diferencias existentes en la ejecución técnica de este gesto entre jugadores con diferente nivel de rendimiento. Las diferencias obtenidas en las variables biomecánicas, entre los tres niveles de rendimiento establecido, ha aportado los aspectos claves en los que debemos focalizar nuestra atención durante la ejecución de este gesto. La muestra que se ha utilizado para realizar esta investigación ha estado compuesta por jugadores representativos de tres niveles de rendimiento, analizándose los lanzamientos mediante la metodología de análisis tridimensionales de video (50 Hz). En general, se puede afirmar que las diferencias halladas entre jugadores de alto rendimiento y jugadores en fase de aprendizaje tienen su fin en la fase final de salida del balón, en donde los jugadores con menor nivel de rendimiento lanzan en trayectoria ascendente del centro de gravedad con el objeto de poder aplicar al balón una gran velocidad de salida. Por lo que se deduce que no existe un modelo teórico universal aplicable del alto rendimiento a jugadores en proceso formativo.Peer Reviewe

Análisis cinemático del viraje en el esquí alpino de competición

Esta comunicación trata sobre la aplicación de la Biomecánica Deportiva como perspectiva científica, al análisis cinemático del esquí alpino como objeto de estudio, y ha sido realizada basándose en una situación real de competición como fue el Campeonato del Mundo de 1996 celebrado en Sierra Nevada (Granada). Para el análisis de la muestra, utilizamos la metodología y las tecnologías propias de la biomecánica Deportiva como son el método indirecto y las técnicas fotogramétricas tridimensionales, basadas en la filmación del gesto deportivo utilizando el vídeo. Los resultados obtenidos muestran la existencia de un patrón general de movimiento en la muestra de esquiadoras analizadas en cuanto a las velocidades tangenciales medias del CG(S).del sistema (esquiador más implementos). Entre las conclusiones, destacamos la existencia de una reducción de la velocidad tangencial media resultante en el recorrido analizado que es mayor aún, en el instante de paso del palo de viraje en particular y cuanto más curva es la trayectoria. Atendiendo a la desviación típica del comportamiento de la velocidad media resultante, podemos decir que en este tramo de paso de la puerta encontramos las diferencias entre la técnica individual de las esquiadoras analizadas. Este estudio nos confirma la importancia del entrenamiento en situación real de competición (en cuanto a material, características pista de entrenamiento, etc.

Immune-mediated hookworm clearance and survival of a marine mammal decrease with warmer ocean temperatures

Indexación: Scopus.We appreciate the logistical support of the Chilean Navy, Artisanal fishermen of Quellon (Vessel crews Marimar II and Nautylus V), and the crews of the Chilean Navy lighthouse. We thank Amanda Hooper, Eugene DeRango, Elvira Vergara, Ignacio Silva, Dr. Lorraine Barbosa, Emma Milner, Sian Tarrant, Emily Morris, Suzette Miller, and Piero Becker for dedicated field assistance. We thank Dr. Vanesa Ezenwa for comments and insights in earlier versions of the manuscript. This work was supported by The Rufford Small Grant Foundation (Grant N 18815–1), Morris Animal Foundation (Grant N D16ZO-413), and the Society for Marine Mammalogy Small Grants in aid awards 2015 and 2016.Increases in ocean temperature are associated with changes in the distribution of fish stocks, and the foraging regimes and maternal attendance patterns of marine mammals. However, it is not well understood how these changes affect offspring health and survival. The maternal attendance patterns and immunity of South American fur seals were assessed in a rookery where hookworm disease is the main cause of pup mortality. Pups receiving higher levels of maternal attendance had a positive energy balance and a more reactive immune system. These pups were able to expel hookworms through a specific immune mediated mechanism and survived the infection. Maternal attendance was higher in years with low sea surface temperature, therefore, the mean hookworm burden and mortality increased with sea surface temperature over a 10-year period. We provide a mechanistic explanation regarding how changes in ocean temperature and maternal care affect infectious diseases dynamics in a marine mammal. © Seguel et al.https://elifesciences.org/articles/3843

Eficiencia de la capacitación agrícola como componente del sistema de extensión agraria.

Se evaluó con una herramientade diagnóstico participativo que integra varias técnicas, la eficiencia del trabajo organizacional para la capacitación de los productores agropecuarios. Se realizaron tres ejercicios participativos: la técnica de tormenta de ideas; las diez preguntas y la matriz de las nueve casillas o matriz General Electric (GE). Se pudo determinar las deficiencias del proceso de capacitación y cómo solucionarlas; la necesidad del trabajo en equipo para los diagnósticos de la demandas, bancos de problemas, diseños de programas y su aplicación; además, se valoró el momento en que se encuentra la escuela para invertir capital y recursos e insertar los productos y servicios en el mercado.Efficiency ofAgricultural Training As anAgrarian Extensionist System Component.ABSTRACTEvaluation was effected through a participative-diagnosis tool which integrates several techniques and the organizational work for agroproducers training. Three participative exercises, i.e., brainstorming, tenquestions, and the nine-square matrix or General Electric matrix were performed. Deficiencies inthe training process and how to solve them; the need of team work todiagnose demands, problems, programs design, and programs application were determined. Besides, the current situation of the School of Training for Agricultural Managers affiliated to the Ministry of Agriculture division in Camagüey was assessed inorder toinvest capitaland resources and also introduce agriproducts and services intothe market

A transcriptomic analysis of gene expression in the venom gland of the snake Bothrops alternatus (urutu)

<p>Abstract</p> <p>Background</p> <p>The genus <it>Bothrops </it>is widespread throughout Central and South America and is the principal cause of snakebite in these regions. Transcriptomic and proteomic studies have examined the venom composition of several species in this genus, but many others remain to be studied. In this work, we used a transcriptomic approach to examine the venom gland genes of <it>Bothrops alternatus</it>, a clinically important species found in southeastern and southern Brazil, Uruguay, northern Argentina and eastern Paraguay.</p> <p>Results</p> <p>A cDNA library of 5,350 expressed sequence tags (ESTs) was produced and assembled into 838 contigs and 4512 singletons. BLAST searches of relevant databases showed 30% hits and 70% no-hits, with toxin-related transcripts accounting for 23% and 78% of the total transcripts and hits, respectively. Gene ontology analysis identified non-toxin genes related to general metabolism, transcription and translation, processing and sorting, (polypeptide) degradation, structural functions and cell regulation. The major groups of toxin transcripts identified were metalloproteinases (81%), bradykinin-potentiating peptides/C-type natriuretic peptides (8.8%), phospholipases A₂(5.6%), serine proteinases (1.9%) and C-type lectins (1.5%). Metalloproteinases were almost exclusively type PIII proteins, with few type PII and no type PI proteins. Phospholipases A₂were essentially acidic; no basic PLA₂were detected. Minor toxin transcripts were related to L-amino acid oxidase, cysteine-rich secretory proteins, dipeptidylpeptidase IV, hyaluronidase, three-finger toxins and ohanin. Two non-toxic proteins, thioredoxin and double-specificity phosphatase Dusp6, showed high sequence identity to similar proteins from other snakes. In addition to the above features, single-nucleotide polymorphisms, microsatellites, transposable elements and inverted repeats that could contribute to toxin diversity were observed.</p> <p>Conclusions</p> <p><it>Bothrops alternatus </it>venom gland contains the major toxin classes described for other <it>Bothrops </it>venoms based on trancriptomic and proteomic studies. The predominance of type PIII metalloproteinases agrees with the well-known hemorrhagic activity of this venom, whereas the lower content of serine proteases and C-type lectins could contribute to less marked coagulopathy following envenoming by this species. The lack of basic PLA₂agrees with the lower myotoxicity of this venom compared to other <it>Bothrops </it>species with these toxins. Together, these results contribute to our understanding of the physiopathology of envenoming by this species.</p

Restructuring of Pancreatic Islets and Insulin Secretion in a Postnatal Critical Window

Function and structure of adult pancreatic islets are determined by early postnatal development, which in rats corresponds to the first month of life. We analyzed changes in blood glucose and hormones during this stage and their association with morphological and functional changes of alpha and beta cell populations during this period. At day 20 (d20), insulin and glucose plasma levels were two- and six-fold higher, respectively, as compared to d6. Interestingly, this period is characterized by physiological hyperglycemia and hyperinsulinemia, where peripheral insulin resistance and a high plasmatic concentration of glucagon are also observed. These functional changes were paralleled by reorganization of islet structure, cell mass and aggregate size of alpha and beta cells. Cultured beta cells from d20 secreted the same amount of insulin in 15.6 mM than in 5.6 mM glucose (basal conditions), and were characterized by a high basal insulin secretion. However, beta cells from d28 were already glucose sensitive. Understanding and establishing morphophysiological relationships in the developing endocrine pancreas may explain how events in early life are important in determining adult islet physiology and metabolism

Efecto repelente y tiempo de protección de aceites esenciales frente al estadio adulto de Aedes aegypti

The aim of this was to evaluate the repellent effect and protection time of essential oils against the adult Aedes aegypti mosquito. A completely randomized design was used with a factorial arrangement that included 10 essential oils (Minthostachys mollis, Schinus molle, Ruta graveolens, Piper aduncun, Myrica pubescens, Lippia alba, Mentha piperita, Lantana glutinosa, Cymbopogon citratus, Eucalyptus globulus and the DEET control. 10%) and four concentrations of the oils (125, 250, 500 and 1000 mg/ml). Each experimental group consisted of 50 adult female A. aegypti mosquitoes raised in the laboratory and the repellent effect and protection time were evaluated using a sedated animal bait (Rattus rattus) with applications of 0.1 ml of the oils on the legs, tail and face. The rats and mosquitoes were found in two communicating cages of 25x25x40 cm. The oils with the greatest repellent effect and protection time, respectively, were C. citratus (97.4%; 165 minutes), E. globulus (95.8%; 165 minutes), L. glutinosa (93.8%; 180 minutes) and M. piperite (93.5%; 180 minutes) in its highest concentration (1000 mg/l); with differences between oils and between concentrations (p&lt;0.001). Likewise, DEET 10% obtained a repellency of 95.3% and a protection time of 173 minutes. It is concluded that the essential oils of C. citratus, E. globulus, L. glutinosa and M. piperita can be considered as having natural repellent potential for A. aegypti.El estudio tuvo como objetivo evaluar el efecto repelente y tiempo de protección de aceites esenciales frente al mosquito adulto de Aedes aegypti. Se trabajó con un diseño completamente al azar con arreglo factorial que incluyó 10 aceites esenciales (Minthostachys mollis, Schinus molle, Ruta graveolens, Piper aduncun, Myrica pubescens, Lippia alba, Mentha piperita, Lantana glutinosa, Cymbopogon citratus, Eucalyptus globulus y el control DEET 10%) y cuatro concentraciones de los aceites (125, 250, 500 y 1000 mg/ml). Cada grupo experimental se constituyó por 50 mosquitos hembra adultos de A. aegypti criados en laboratorio y el efecto repelente y tiempo de protección se evaluaron usando un cebo animal sedado (Rattus rattus) con aplicaciones de 0.1 ml de los aceites en patas, cola y cara. Las ratas y los mosquitos se encontraron en dos jaulas comunicadas de 25x25x40 cm. Los aceites con mayor efecto repelente y tiempo de protección, respectivamente, fueron: C. citratus (97.4%; 165 minutos), E. globulus (95.8%; 165 minutos), L. glutinosa (93.8%; 180 minutos) y M. piperita (93.5%; 180 minutos) en su concentración mayor concentración (1000 mg/l); con diferencias entre aceites y entre concentraciones (p&lt;0.001). Asimismo, el DEET 10% obtuvo una repelencia de 95.3 % y tiempo de protección de 173 minutos. Se concluye que los aceites esenciales de C. citratus, E. globulus, L. glutinosa y M. piperita pueden considerarse con potencial repelente natural para A. aegypti

The CARMENES search for exoplanets around M dwarfs High-resolution optical and near-infrared spectroscopy of 324 survey stars

The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the survey sample by publishing one CARMENES spectrum for each M dwarf. These spectra cover the wavelength range 520–1710 nm at a resolution of at least R >80 000, and we measure its RV, Hα emission, and projected rotation velocity. We present an atlas of high-resolution M-dwarf spectra and compare the spectra to atmospheric models. To quantify the RV precision that can be achieved in low-mass stars over the CARMENES wavelength range, we analyze our empirical information on the RV precision from more than 6500 observations. We compare our high-resolution M-dwarf spectra to atmospheric models where we determine the spectroscopic RV information content, Q, and signal-to-noise ratio. We find that for all M-type dwarfs, the highest RV precision can be reached in the wavelength range 700–900 nm. Observations at longer wavelengths are equally precise only at the very latest spectral types (M8 and M9). We demonstrate that in this spectroscopic range, the large amount of absorption features compensates for the intrinsic faintness of an M7 star. To reach an RV precision of 1 m s−1 in very low mass M dwarfs at longer wavelengths likely requires the use of a 10 m class telescope. For spectral types M6 and earlier, the combination of a red visual and a near-infrared spectrograph is ideal to search for low-mass planets and to distinguish between planets and stellar variability. At a 4 m class telescope, an instrument like CARMENES has the potential to push the RV precision well below the typical jitter level of 3–4 m s−1