ABSTRACT
A morfologia das células epiteliais do intestino médio de larvas de Anticarsia gemmatalis (Hübner) é descrita em microscopia de luz e eletrônica de transmissão. O intestino médio de A. gemmatalis é a maior porção do trato digestivo, apresentando três regiões distintas: proximal, média e distal. Sua parede é formada por um tecido epitelial pseudo-estratificado colunar, com quatro tipos celulares: células colunares, caliciformes, regenerativas e endócrinas. As células colunares, observadas em maior quantidade, são altas, apresentam longas e numerosas microvilosidades na porção apical e na porção basal as invaginações da membrana formam o labirinto basal. As células caliciformes apresentam uma grande câmara central delimitada por projeções citoplasmáticas repletas de mitocôndrias no interior. As células regenerativas têm o citoplasma mais elétron-denso e com poucas organelas. As células endócrinas são caracterizadas pela presença de grânulos secretores bastante elétron-densos concentrados principalmente no citoplasma basal da célula.
Subject(s)
Animals , Epithelial Cells , Intestines , Lepidoptera , Larva/ultrastructure , Microscopy, ElectronABSTRACT
The morphology of the midgut epithelium cells of Anticarsia gemmatalis (Hübner) larvae is described by light and transmission electron microscopy. The midgut of A. gemmatalis is the largest portion of the digestive tract, with three distinct regions: proximal, media and distal. Its wall is formed by pseudostratified columnar epithelial tissue having four cell types: columnar, goblet, regenerative, and endocrine cells. The columnar cells are numerous and long, with the apical portion showing many lengthy microvilli and the basal portion invaginations forming a basal labyrinth. The goblet cells have a large goblet-shaped central cavity delimited by cytoplasmic projections filled with mitochondria. The regenerative cells present electron-dense cytoplasm and few organelles. The endocrine cells are characterized by electron-dense secretory granules, usually concentrated in the cytoplasm basal region.
A morfologia das células epiteliais do intestino médio de larvas de Anticarsia gemmatalis (Hübner) é descrita em microscopia de luz e eletrônica de transmissão. O intestino médio de A. gemmatalis é a maior porção do trato digestivo, apresentando três regiões distintas: proximal, média e distal. Sua parede é formada por um tecido epitelial pseudo-estratificado colunar, com quatro tipos celulares: células colunares, caliciformes, regenerativas e endócrinas. As células colunares, observadas em maior quantidade, são altas, apresentam longas e numerosas microvilosidades na porção apical e na porção basal as invaginações da membrana formam o labirinto basal. As células caliciformes apresentam uma grande câmara central delimitada por projeções citoplasmáticas repletas de mitocôndrias no interior. As células regenerativas têm o citoplasma mais elétron-denso e com poucas organelas. As células endócrinas são caracterizadas pela presença de grânulos secretores bastante elétron-densos concentrados principalmente no citoplasma basal da célula.
ABSTRACT
En las adolescentes con ambigüedad sexual el handicap del conflicto biológico dificulta el proceso de asunción de la idoneidad sexual. Se exponen los caos en donde los procesos fueron diferentes y pensamos que la resolución de la subjetividad femenina dependió en gran medida de la estructura psicopatológica individual y familiar, de la historia y de las vivencias ifantiles
Subject(s)
Adolescent , Humans , Male , Female , Gender Identity , Psychology, Adolescent , Psychosexual Development , Sex Education , Sexual Behavior/psychology , Sexual Maturation , ArgentinaABSTRACT
Hepatitis B immunization for health care workers is common policy in many countries where they constitute a particular at risk group. A seroepidemiological study of hepatitis B virus (HBV) in Fiji health care workers was conducted to determine whether this occupational group (or subgroups thereof) were at higher risk of infection than the general Fiji population. The purpose of this study was to ascertain whether health staff should be immunized, or whether it would be more productive to focus resources on neonatal immunization. Blood samples were obtained from 2,639 health workers and the sera analysed by radio-immunoassay for hepatitis B surface antigen (HBsAg), and hepatitis B surface antibody (anti-HBs). Prevalence rates of HBV markers of infection were compared with those observed in the general population, from a previous population-based cluster sample survey. Approximately 70% of the health care staff participated in the study. Prevalence of total HBV markers was 24%. The rate of HBsAg was 5%. Sex and ethnic group specific prevalence rates varied. Male subjects, Fijians and "other" Pacific Islanders all experienced higher rates of infection. Rural/urban and age related trends were also observed. Rates of infection in health staff were lower than those reported in the general population. Previous studies have indicated that most of the transmission of hepatitis B in hyperemdemic Pacific populations occurs at birth or within the next few years. There was no consistent pattern of hepatitis B infection in different occupational groups of health care workers. Certain relatively socially homogeneous subgroups of health workers were analysed separately, and among these health workers there was evidence for increased risk of infection due to exposure to blood or used hypodermic syringes, but not due to patient contact. Until health staff assume a higher risk of infection than the general Fijian population, efforts directed at community-wide control of hepatitis B continue to be the most appropriate use of resources.