Age-dependent resistance to Porcine reproductive and respiratory syndrome virus replication in swine

<p>Abstract</p> <p>Background</p> <p>Porcine reproductive and respiratory syndrome virus (PRRSV) causes a prolonged, economically devastating infection in pigs, and immune resistance to infection appears variable. Since the porcine adaptive immune system is not fully competent at birth, we hypothesized that age influences the dynamics of PRRSV infection. Thus, young piglets, growing 16-20-week-old finisher pigs, and mature third parity sows were infected with virulent or attenuated PRRSV, and the dynamics of viral infection, disease, and immune response were monitored over time.</p> <p>Results</p> <p>Virulent PRRSV infection and disease were markedly more severe and prolonged in young piglets than in finishers or sows. Attenuated PRRSV in piglets also produced a prolonged viremia that was delayed and reduced in magnitude, and in finishers and sows, about half the animals showed no viremia. Despite marked differences in infection, antibody responses were observed in all animals irrespective of age, with older pigs tending to seroconvert sooner and achieve higher antibody levels than 3-week-old animals. Interferon γ (IFN γ) secreting peripheral blood mononuclear cells were more abundant in sows but not specifically increased by PRRSV infection in any age group, and interleukin-10 (IL-10) levels in blood were not correlated with PRRSV infection status.</p> <p>Conclusion</p> <p>These findings show that animal age, perhaps due to increased innate immune resistance, strongly influences the outcome of acute PRRSV infection, whereas an antibody response is triggered at a low threshold of infection that is independent of age. Prolonged infection was not due to IL-10-mediated immunosuppression, and PRRSV did not elicit a specific IFN γ response, especially in non-adult animals. Equivalent antibody responses were elicited in response to virulent and attenuated viruses, indicating that the antigenic mass necessary for an immune response is produced at a low level of infection, and is not predicted by viremic status. Thus, viral replication was occurring in lung or lymphoid tissues even though viremia was not always observed.</p

A Bilingual “Neighborhood Club”: Intervening with Children Exposed to Urban Violence

Mental health practitioners have offered relatively little in response to the pervasive community violence faced by many children living in impoverished neighborhoods. The “neighborhood club” is a school-based, short-term, support group designed to assist children with the psychological impact of exposure to community violence. Ten “neighborhood clubs” were conducted in two public elementary schools in Detroit, Michigan. This paper reviews the implementation of a bilingual “neighborhood club,” undertaken to better serve the Spanish-speaking Latino students in a school community. We discuss many of the rewards and challenges of conducting a bilingual, multicultural support group for children and conclude that a bilingual support group provides all children with a model that validates ethnic and cultural diversity while also building empathic bonds based on mutually-reinforcing, common experiences.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/42734/1/10464_2006_Article_9016.pd

EGRAFIA 2009 ROSARIO. Memorias del seminario “La gráfica en la formación de grado para los profesionales del futuro”

Por cuestiones de tamaño la presentación fue dividida en 7 archivos. Estos no son independientes unos de los otros, se deben descargar todos y descomprimirlos (con Winrar u otro programa).Publicación del Seminario EGRAFIA 2009 Rosario, realizado con el objetivo de intercambiar las experiencias desarrolladas en relación a la Expresión Gráfica en Arquitectura, Ingeniería y otras Áreas del Diseño. Se trataron temas relacionados con la docencia y el modelo curricular en las asignaturas de grado en distintas Universidades