985 resultados para Tipos de migración


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The present paper deals with the evaluation of morphological and morphometric alterations of slow-twist (I) and fast-twitch (II) fibers of rectus abdominis muscle of adult female dog during pregestational phase, at 30 and 60 days of pregnancy and at 30 days after the parturition. At the every phases, using the open biopsy technique, muscle samples were collected. The samples were plunged. Histological sections were cut in a microtome. For general morphology, some sections were stained with HE. Subsequent sections were reacted for myofibrillar ATPase (m-ATPase), after alkaline (pH 10.4) and acid (pH 4.4) pre-incubations, in order to identificate type I and II fibers. In the pre-gestational phase, muscle tissue revealed to be composed by fibers with different diameters, presenting polygonal outlines and one or more periphery nuclei. At 30 days of pregnancy, muscle fiber characteristics were similar. At 60 days, in addition to the existence of normal fibers, polymorphic and small diameter fibers were frequent. At 30 days after the parturation, the morphology of muscle fiber were similar to that observed in the pre-gestational phase. In the four phases, type II fiber diameters were lager than type I. The diameters of both fiber types showed a significant reduction in the 30 days phase and a significative increasing at 60 days. The expansion of the abdominal wall during the pregnancy represents a chronic stimulus, induced changes in the morphology and in the fiber type diameters.

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En Centroamérica y la República Dominicana se está consolidando un complejo proceso de movimiento poblacional. Alrededor de 5,4 millones de personas de la subregión reside en otro país, y los flujos intrarregionales han adquirido una dimensión progresivamente importante. Para avanzar en el proceso de integración de la subregión con un enfoque de promoción de los derechos de los migrantes, es necesario atender a las formas institucionales que dan cumplimiento a estos derechos, en particular en relación a los derechos laborales y de protección social. Este documento esboza los principales desafíos de los países de la subregión para promover la movilidad intrarregional laboral de las personas y, en particular, para el acceso a la protección social de los migrantes. Asimismo, se destaca el rol de las asimetrías de los mercados laborales y de la protección social como uno de los factores determinantes de los movimientos poblacionales. Para que la migración laboral intrarregional contribuya al desarrollo de la subregión sería necesaria una política migratoria integral que favorezca la libre movilidad, el reconocimiento mutuo de calificaciones profesionales, y la homologación de prestaciones y derechos laborales, incluyendo la seguridad social.

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Anterior cruciate ligament (ACL) injuries are common in sports. Studies investigating injury mechanisms have demonstrated that most injuries arise from landing tasks. Despite the demonstration of differences between male and female kinematics, there are no studies showing how males behave during different landing tasks. The objective of this study was to compare the angular and temporal kinematics of the lower limbs between two different landing tasks. Double leg and single leg landings were recorded in the frontal and sagittal plane in 15 male volleyball athletes by videogrammetry. Reduced hip and knee flexion and increased knee valgus were observed in the single leg landing task compared to the double leg landing task. No significant difference in landing time was observed between the two tasks. In conclusion, the results support the premise that lower limb kinematics change according to the task performed. Further studies are necessary to explore the impact of these kinematic differences on knee loading and to relate them to ACL injury mechanisms in men.

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