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1.
Medisan ; 21(3)mar. 2017. tab
Artículo en Español | LILACS | ID: biblio-841667

RESUMEN

Se realizó un estudio observacional, descriptivo y transversal de 59 trabajadores que se encontraban laborando físicamente en el Servicio de Estomatología del Policlínico Docente Julián Grimau de Santiago de Cuba, desde julio de 2015 hasta igual mes de 2016, con el fin de identificar la iluminación como agente físico negativo en el ambiente laboral. En la serie predominaron el sexo femenino (93,2 por ciento), el grupo etario de 50-54 años (23,7 por ciento), los estomatólogos generales integrales (44,0 por ciento), así como el departamento de Ortodoncia y Periodoncia como el de menor iluminación. Por otra parte, 81,4 por ciento de los trabajadores estaban expuestos a esta problemática y 93,8 por ciento presentaban afecciones oculares. Se evidenció que la iluminación deficiente encontrada en todos los departamentos del mencionado centro resulta perjudicial para la salud de los profesionales de la estomatología


An observational, descriptive and cross-sectional study of 59 workers that were physically working in the Stomatological Service of Julián Grimau Teaching Polyclinic in Santiago de Cuba, was carried out from July, 2015 to the same month in 2016, with the purpose of identifying the illumination as negative physical agent in the working environment. In the series there was a prevalence of the female sex (93.2 percent), the 50-54 years age group (23.7 percent), the comprehensive general dentists (44.0 percent), as well as the Orthodontics and Periodontics department as that of less illumination. On the other hand, 81.4 percent of the workers were exposed to this problem and 93.8 percent presented ocular disorders. It was evidenced that poor illumination found in all the departments of the mentioned center is harmful for the stomatology professionals health


Asunto(s)
Humanos , Masculino , Femenino , Adulto , Persona de Mediana Edad , Anciano , Iluminación , Medicina Oral , Oscuridad/efectos adversos , Servicio Odontológico Hospitalario , Odontología , Epidemiología Descriptiva , Estudios Transversales , Estudio Observacional
2.
Egyptian Journal of Histology [The]. 2008; 31 (2): 354-361
en Inglés | IMEMR | ID: emr-86280

RESUMEN

This study aimed to investigate by using electron microscope and immunohistochemistry, effects of short duration of light exposure on the Leydig cells of rat's testis. It tries to relate between seasonally changed environmental light factor and an important part of male reproductive system. Sixteen adult male albino rats were divided according to light exposure into control group [six rats] exposed to light: dark 12:12 h and group II [ten rats] exposed to light: dark 8:16h, daily for eight weeks. Light was provided by 20 watt fluorescent bulb. Testes Specimens were prepared for electron microscope and paraffin sections were stained for Fas and VEGF immunohistochemistry. Optical density of VEGF immunoreaction in Leydig cells was assessed morphometrically. In group II, the ultrastructural findings showed less mitochondria, smooth endoplasmic cisternae and secretary vesicles. Cytoplasmic vacuoles and irregularity of cell membrane of some Leydig cells were detected. Irregular nuclear membrane and condensation of nuclear chromatin were seen. Immunoreactivity for Fas was positive in some Leydig cells of group II. VEGF immunoreaction was decreased in many Leydig cells and this was proved by a significant decrease in mean optical density of VEGF immunoreaction. Short photoperiod exposure [which reflects short days of the year] may result in hypofunction of the Leydig cells in rat's testis with possible consequent decreased testosterone secretion and reproductive regression. So, seasonal fluctuations in Leydig cells morphology and function may serve to synchronize reproduction with favorable environmental conditions


Asunto(s)
Masculino , Animales de Laboratorio , Iluminación/efectos adversos , Oscuridad/efectos adversos , Testículo , Microscopía Electrónica , Inmunohistoquímica , Endotelio Vascular , Factores de Crecimiento Endotelial , Receptor fas , Ratas , Factor A de Crecimiento Endotelial Vascular
3.
Arq. bras. oftalmol ; Arq. bras. oftalmol;67(3): 455-458, maio-jun. 2004. ilus, graf
Artículo en Portugués | LILACS | ID: lil-361698

RESUMEN

OBJETIVO: A proposta deste estudo é descrever e analisar o comportamento palpebral após escuridão abrupta em indivíduos normais. MÉTODOS: Foram captadas imagens das pálpebras em ambiente claro e após escurecimento total. Os grupos foram crianças com idades entre 2 a 11 meses, 22 a 36 meses e adultos entre 19 e 61 anos. A distância entre o centro pupilar e a margem palpebral superior foi medida nas duas imagens. RESULTADOS: Houve elevação da pálpebra superior após privação de luz em todos os indivíduos, sendo que nas crianças houve maior amplitude. CONCLUSÕES: A privação de luz provoca elevação transitória da pálpebra superior em crianças e adultos.


Asunto(s)
Humanos , Lactante , Preescolar , Adulto , Persona de Mediana Edad , Oscuridad/efectos adversos , Párpados/fisiología
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