RESUMEN
Resumen La política internacional de protección del patrimonio mundial de la UNESCO se integró en las agendas de desarrollo nacional y local de los países de América Latina, gestionando proyectos de mejoramiento social y urbano en barrios históricos de las ciudades. Los efectos sociales, ambientales y económicos de estos procesos de patrimonialización de los lugares no han sido suficientemente analizados. En este sentido, y asumiendo una perspectiva psicoambiental, esta investigación describe y compara los índices de Apego al Lugar e Identidad de Lugar en habitantes de tres barrios de la ciudad de Valparaíso (n=544) (Chile) y dos en la ciudad de Quito (n=209) (Ecuador), que se encuentran ubicados en zonas catalogadas como Patrimonio de la Humanidad. A través de la aplicación de pruebas t de Student de comparación de medias y d de Cohen de valoración del tamaño del efecto, se observó que las personas que cuentan con mayor tiempo de residencia, que habitan barrios patrimoniales consolidados (donde las dimensiones socio-urbanas del entorno se encuentran mayormente intervenidas y desarrolladas) y que son propietarias de sus viviendas presentan puntajes más altos de Apego al Lugar e Identidad de Lugar. Se observó un nivel moderado de Apego de Lugar e Identidad de Lugar en los habitantes de los barrios patrimoniales de las ciudades de Valparaíso y Quito.
Abstract UNESCO's international policy for the protection of world heritage was integrated into the national and local development agendas of Latin American countries, managing social and urban improvement projects in historic city districts. The social, environmental and economic effects of these processes of heritage sites have not been sufficiently analyzed. In this sense and assuming a psycho-environmental perspective, this research describes and compares the indices of place attachment and place identity in 3 neighborhoods in the city of Valparaiso (n=544) and 2 in the city of Quito (n=209), which are located in areas classified as World Heritage. Through the application of Student t tests for comparing means and Cohen d tests for assessing the size of the effect, it was observed that people who have resided for longer periods of time, who live in consolidated heritage neighborhoods and who own their own homes, show higher scores in terms of place attachment and place identity. A moderate level of Place Attachment and Place Identity was observed in Valparaíso and Quito.
RESUMEN
In this article, we focus on the fundamental role of vitamin C transporters for the normal delivery of vitamin C to germ cells in the adluminal compartment of seminiferous tubules. We argue that the redox status within spermatozoa or in semen is partly responsible for the etiology of infertility. In this context, antioxidant defence plays a critical role in male fertility. Vitamin C, a micronutrient required for a wide variety of metabolic functions, has long been associated with male reproduction. Two systems for vitamin C transport have been described in mammals. Facilitative hexose transporters (GLUTs), with 14 known isoforms to date, GLUT1-GLUT14, transport the oxidized form of vitamin C (dehydroascorbic acid) into the cells. Sodium ascorbic acid co-transporters (SVCTs), SVCT1 and SVCT2 transport the reduced form of vitamin C (ascorbic acid). Sertoli cells control germ cell proliferation and differentiation through cell-cell communication and form the blood-testis barrier. Because the blood-testis barrier limits direct access of molecules from the plasma into the adluminal compartment of the seminiferous tubule, one important question is the method by which germ cells obtain vitamin C. Some interesting results have thrown light on this matter. Expression of SVCT2 and some isoforms of GLUT transporters in the testis have previously been described. Our group has demonstrated that Sertoli cells express functionally active vitamin C transporters. Kinetic characteristics were described for both transport systems (SVCT and GLUT systems). Sertoli cells are able to transport both forms of vitamin C. These findings are extremely relevant, because Sertoli cells may control the amount of vitamin C in the adluminal compartment, as well as regulating the availability of this metabolite throughout spermatogenesis.