Relationships between adolescent physical self-concept and physical activity

El objetivo de este estudio es someter a prueba dos modelos contrapuestos sobre las relaciones entre las autopercepciones físicas y la actividad físico-deportiva en la adolescencia: mientras que un modelo postula la influencia de la actividad física sobre el autoconcepto físico, el modelo alternativo propone al autoconcepto físico como factor influyente en la actividad físicodeportiva. Participan en la investigación 704 estudiantes, 394 (55.96 %) hombres y 310 (44.04 %) mujeres entre 11 y 19 años (M = 14.91; D.T. = 2.13), residentes en dos Comunidades Autónomas (Cantabria y País Vasco) de España. Los resultados indican que las influencias entre el autoconcepto físico y la actividad físico-deportiva se producen de forma bidireccional si bien ajusta mejor el modelo que propone al autoconcepto físico como factor influyente. Se comprueban diferencias entre hombres y mujeres en el modelo. Por otro lado, la autopercepción de atractivo físico mantiene una relación negativa con la actividad físico-deportivaThe aim of this study is to test two opposing models of the relationship between physical self-perceptions and physical activity during adolescence: one which postulates that physical activity influences physical self-concept, and another one which proposes that physical self-concept influences physical activity. Participants were 704 students aged between 11 and 19 (M = 14.91; SD = 2.13) from two different Autonomous Regions in Spain (Cantabria and the Basque Country). 394 (55.96%) were male and 310 (44.04%) were female. The results indicate that the influences between physical self-concept and physical activity are bidirectional in nature, although the model that proposes physical selfconcept as an influencing factor was found to have a better fitness. Differences were found in the model between male and female students. Furthermore, selfperception of physical attractiveness was found to be negatively related to physical activityEste artículo lo firman componentes del Grupo Consolidado de Investigación del Sistema Universitario Vasco IT701-13 y forman parte de los resultados del proyecto EDU2009-10102 (subprograma EDUC) subvencionado por el MICINN. La investigación se ha realizado con la colaboración del Programa para la Contratación de Doctores Recientes de la Universidad del País Vasco (UPV/EHU

The quasi-cylindrical description of submerged laminar swirling jets

TThe quasi-cylindrical approximation is used to describe numerically the structure of a submerged swirling jet for subcritical values of the swirl ratio S<Sc . The emerging flow structure is affected by the swirling motion, which enhances the entrainment rate of the jet and induces an adverse pressure gradient that reduces its momentum flux. The effect is more pronounced as the swirl ratio S is increased, yielding for sufficiently large values of S a jet with an annular structure. The integration describes the smooth transition towards the far-field self-similar solution for all values of S smaller than a critical value S5Sc , at which the numerical integration fails to converge at a given downstream location. The comparisons with previous experimental results confirm the correspondence between the onset of vortex breakdown and the failure of the quasi-cylindrical approximation

Early hours of treatment in a neonate nine-banded armadillo (dasypus novemcinctus) rescued from illegal trafficking in Ecuador

This paper presents the case of a baby nine-banded armadillo (Dasypus novemcinctus), which was rescued from illegal wildlife trafficking in the province of Pastaza (Ecuador) and was delivered to the Center for Wildlife Rescue Flor de la Amazonia Wayra Urku (Km.35 via Arajuno, Puyo-Pastaza, Ecuador). This animal had at the time of rescue, severe hypothermia and dehydration, was treated and later was introduced to a change in diet ideal for raising it. In this review we discuss the different ways to approach the case and the treatment chosen to avoid premature death of the animal. It is believed that proper protocol was chosen to correct the initial unstable state and start hand rearing.En este trabajo se expone el caso de una cría de armadillo de nueve bandas (Dasypus novemcinctus) que fue rescatado del tráfico ilegal de especies en la provincia de Pastaza (Ecuador) y que fue entregado al Centro de Rescate de Fauna Silvestre Flor de la Amazonía Wayra Urku (Km.35 vía Arajuno, Puyo-Pastaza, Ecuador). Dicho animal presentaba en el momento del rescate una severa hipotermia y deshidratación de la que fue tratado y posteriormente se instauró el cambio de dieta ideal para la crianza a biberón del neonato. En este trabajo se discuten las diferentes formas de abordar el caso así como los tratamientos elegidos para evitar la muerte prematura del animal. Se considera que se eligió un correcto protocolo para corregir el estado inestable inicial y comenzar con la crianza a mano de la cría

Niveles de glucosa y triglicéridos en plasma seminal y motilidad espermática en COBAYOS alimentadas con 10% más en energÍa digestible

The objective the study was to determine the levels of glucose and triglycerides in seminal plasma of 10 guinea pigs, which were fed for a period of 2 months with a diet containing 10% more ED. The level of glucose found in seminal plasma was 11.59 ± 0.5 mg/dL and triglyceride value was 55.95 ± 3.2 mg/dL, while the motility was 97% on average. We conclude that in guinea pigs the levels both glucose and triglycerides were increased by major level of ED in feed, but the spermatic motility was not.El objetivo del presente estudio fue determinar los niveles de los componentes energéticos (glucosa y triglicéridos) en el plasma seminal y la motilidad espermática de 10 cobayos, los cuales fueron alimentados por un período de 2 meses con una dieta 10% mayor en energía digestible (ED). El nivel de glucosa encontrado en plasma seminal fue de 11.59 ± 0.5 mg/dL y el valor de triglicéridos fue de 55.95 ± 3.2 mg/dL, mientras que la motilidad promedio fue de 95%. Concluimos que en cobayos los niveles de glucosa y triglicéridos se incrementan al aumentar el nivel de ED en dieta sin producir alteraciones en la motilidad espermática

Laminar Craya-Curtet jets

This Brief Communication investigates laminar Craya-Curtet flows, formed when a jet with moderately large Reynolds number discharges into a coaxial ducted flow of much larger radius. It is seen that the Craya-Curtet number, C=(J/sub c//J/sub j/)/sup 1/2/, defined as the square root of the ratio of the momentum flux of the coflowing stream to that of the central jet, arises as the single governing parameter when the boundary-layer approximation is used to describe the resulting steady slender jet. The numerical integrations show that for C above a critical value C/sub c/ the resulting streamlines remain aligned with the axis, while for C<C/sub c/ the entrainment demands of the jet cannot be satisfied by the coflow, and a toroidal recirculation region forms. The critical Craya-Curtet number is determined for both uniform and parabolic coflow, yielding C/sub c/=0.65 and C/sub c/=0.77, respectively. The streamlines determined numerically are compared with those obtained experimentally by flow visualizations, yielding good agreement in the resulting flow structure and also in the value of C/sub c

Surgery technique for ovine ruminal cannulation

The study of the ruminants' digestive system is of great interest to improve their productive efficiency. From 1928, in which Schalk and Amadon described the technique of cannulation in one stage for bovine and ovine, are developed numerous modifications of that technique as well as new others. A common problem is that can appear complications as movements of the cannula, increases in size of the fistula by necrosis of the tissue or ruminal fluid leak. The developed technique provides a simplification to the surgery, minimizes the complications and lengthens functional life of the cannula.El estudio del sistema digestivo de los rumiantes es de gran interés para conseguir mejorar su eficiencia productiva. Desde 1928, año en el que Schalk y Amadon describieron la técnica de canulación en una fase para su utilización en bovino y ovino, se desarrollan numerosas modificaciones de esta técnica así como otras nuevas. Un problema común es que pueden aparecer complicaciones como movimientos de la cánula, aumentos de tamaño de la fístula por necrosis o fugas de líquido ruminal. La técnica desarrollada aporta una simplificación a la cirugía, minimiza las complicaciones y alarga vida funcional de la cánula

Correlaciones entre la infección por microquistes de S. lamacanis y CK-MB, Ast y LDH alpacas

El presente estudio tuvo objetivo determinar la correlación entre el número de microquistes de S. lamacanis en miocardio (N°Mq) y los niveles en sangre de las enzimas CK-MB, AST y LDH en alpacas, a fin de usarlos como predictores de salud o grado de infección por sarcocystiosis. Se utilizaron 41 alpacas de 3-5 años de edad del matadero Municipal Ninacaca, Pasco-Perú, las muestras de sangre se colectaron ante-mortem y las de miocardio post-mortem. El 100 % de los animales presentaron microquistes de S. Lamacanis, y los coeficientes de correlación entre el N°Mq y CK-MB fue de 0.17, AST 0.04 y para LDH 0.06. Se concluye que la correlación es muy baja o casi nula, por lo que las enzimas evaluadas no tendrían mayor importancia para determinar daño cardiaco por infección de microquistes de S. Lamacanis en alpacas

Mutual optical injection in coupled DBR laser pairs

We report an experimental study of nonlinear effects, characteristic of mutual optical coupling, in an ultra-short coupling regime observed in a distributed Bragg reflector laser pair fabricated on the same chip. Optical feedback is amplified via a double pass through a common onchip optical amplifier, which introduces further nonlinear phenomena. Optical coupling has been introduced via back reflection from a cleaveended fibre. The coupling may be varied in strength by varying the distance of the fibre from the output of the chip, without significantly affecting the coupling time. © 2008 Optical. Society of America

Synchronization of spatiotemporal semiconductor lasers and its application in color image encryption

Optical chaos is a topic of current research characterized by high-dimensional nonlinearity which is attributed to the delay-induced dynamics, high bandwidth and easy modular implementation of optical feedback. In light of these facts, which adds enough confusion and diffusion properties for secure communications, we explore the synchronization phenomena in spatiotemporal semiconductor laser systems. The novel system is used in a two-phase colored image encryption process. The high-dimensional chaotic attractor generated by the system produces a completely randomized chaotic time series, which is ideal in the secure encoding of messages. The scheme thus illustrated is a two-phase encryption method, which provides sufficiently high confusion and diffusion properties of chaotic cryptosystem employed with unique data sets of processed chaotic sequences. In this novel method of cryptography, the chaotic phase masks are represented as images using the chaotic sequences as the elements of the image. The scheme drastically permutes the positions of the picture elements. The next additional layer of security further alters the statistical information of the original image to a great extent along the three-color planes. The intermediate results during encryption demonstrate the infeasibility for an unauthorized user to decipher the cipher image. Exhaustive statistical tests conducted validate that the scheme is robust against noise and resistant to common attacks due to the double shield of encryption and the infinite dimensionality of the relevant system of partial differential equations.Comment: 20 pages, 11 figures; Article in press, Optics Communications (2011