OBJETIVO: O presente estudo objetivou identificar conhecimentos sobre DST, atitudes autorreferidas por adolescentes relacionadas à prática sexual e verificar fatores associados a não utilização de preservativo masculino. MÉTODOS: Estudo transversal realizado com 1.820 adolescentes de escolas públicas da cidade de Uberaba (MG), nos anos de 2005 e 2006. RESULTADOS: A maioria dos adolescentes era do sexo masculino, conversavam sobre sexo, referiram não ter apresentado DSTs, consideravam que o preservativo masculino evitava DSTs e informaram utilizar preservativo. Fatores relacionados ao não uso do preservativo foram ser do sexo feminino, acreditar que o preservativo não evita DST, ser inconveniente e ter parceiro fixo. CONCLUSÃO: Os resultados indicam que a maioria dos adolescentes possui informações suficientes sobre DST e adotam comportamentos responsáveis em relação a sua saúde e a do parceiro, porém é fundamental adotar ações continuadas para todos perceberem a importância da prevenção.
The aim of this work was the study of ultrastructural morphologic and morphometric changes in myocardiocytes from chronic chagasic hamsters (Mesocricetus auratus), comparatively with changes described in other animal models and in human Chagas disease. Four chagasic animals and three nonchagasic controls were studied. Mitochondria changes were the most conspicuous findings, varying from swelling to complete organelle destruction. Noteworthy, T-tubules appeared tortuous and interrupted at the Z-line level and there was dehiscence in intercalated disks, especially in adherens junctions;in addition, the myofibrils were separated from each other by intracellular edema, with mild to accentuated focal lyses. In morphometric analysis, both the numeric density and the area of mitochondria from chagasic and normal control animals were statistically similar; however, the infected hamsters showed statistically significant enlarged sarcomeres and reduced myofibril thickness. Based on the morphologic and morphometric characteristics observed in these experimental animals, one may conclude that heart changes described at light microscopy in human Chagas disease can have a substrate on electron microscopy. Moreover, the hamster also constitutes a useful animal model to pathology studies in Chagas disease on electron microscopy.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.