Radioprotection
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. AplicaÃÃo da citogenÃtica na avaliaÃÃo da radioproteÃÃo de traumatologistas do Recife / Application of cytogenetics for evaluating radioprotection conditions of traumatologists in Recife
Among the activities involving the application of ionizing radiation in medicine, fluoroscopic procedures correspond to the major source of irradiation to doctors. Fluoroscopy consists of X-ray equipment coupled with an image intensifier. This methodology permits a real time visualization of interior of the patientâs body during a surgery. A recent study pe
Publicado em: 2006
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14. Physical and biological dosimetry for risk perception in radioprotection
O crescente aumento das aplicações das radiações ionizantes, em particular as radiações de origem nuclear, tem sido acompanhado pelo aumento do interesse público em relação aos riscos associados a essas aplicações. A percepção de tais riscos por parte da população é freqüentemente baseada na filosofia que a radiação ionizante é perigosa i
Brazilian Archives of Biology and Technology. Publicado em: 2005-10
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15. Emprego das aberraÃÃes cromossÃmicas instÃveis e micronÃcleos no biomonitoramento individual: estudo comparativo
Biodosimetry is based on the investigation of radioinduced biological effects in order to correlate them with the absorbed dose. The quantification of unstable chromosome aberrations and micronuclei, in peripheral blood lymphocytes, are two methods commonly used in biodosimetry. In this context, the aim of this research was to compare these methods in the bi
Publicado em: 2005
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16. EstabilizaÃÃo radiolÃtica do poli(metacrilato de metila) industrial
Poly(methyl methacrylate), PMMA, Acrigel, a Brazilian polymer, is used in the manufacture of medical supplies sterilizable by ionizing radiation. However, when PMMA is gammairradiated it undergoes main chain scissions, which promote molecular degradation causing reduction in its physical properties. Therefore, radiolytic stabilization of PMMA is important fo
Publicado em: 2005
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17. Radon and progeny in dwellings of the city of Sao Paulo / Radônio e filhos em residências da cidade de São Paulo
As doses resultantes da contaminação ambiental por radônio e seus filhos em residências geram discussões entre pesquisadores sobre os reais danos biológicos que elas possam causar. De um lado as agências de proteção radiológica adotam o modelo proposto por vários pesquisadores de que qualquer dose, por menor que seja, pode produzir dano. Por outro
Publicado em: 2005
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18. Dosimetric evaluation in panoramic and teleradiography procedures / AvaliaÃÃo DosimÃtrica em procedimentos de Radiografia PanorÃmica e Teleradiografias
The present work had as an objective to evaluate the skin surface entrance dose in panoramic and teleradiography procedures in three clinics in Recife - Pernambuco - Brazil, and to contribute with data for the determination of reference levels for supercited extraoral procedures, for this purpose, operational conditions in 3 clinics were evaluated in Recife,
Publicado em: 2004
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19. Vitamina E e seu efeito radioprotetor sobre o tecido de reparo : estudo morfologico e histometrico
This research had for purpose to evaluate the action of the vitamin E as a radioprotector in the process of the tissue repair in rats, that suffered previously a surgical procedure, which consists of the wound production in the dorsal area. The animais were divided into 8 groups: group C (control) - it consists only of animais in which the wound was made; VE
Publicado em: 2004
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20. Avaliação do efeito radioprotetor do selenito de sodio no processo de reparação tecidual : estudo experimental em ratos
The aim of this study was to evaluate the Sodium Selenite as protection substance. It were made rectangular wounds (2,5 X 1,5 cm) in the dorsal region of the rats, in order to stimulate the growing of the repair process. The rats were then divided into four groups as follows: control group, where only were made the wounds; selenium group, where 2 mg of sodiu
Publicado em: 2001
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21. Intestinal radioprotection by vitamin E (alpha-tocopherol).
OBJECTIVES: The major objective of this study was to test vitamin E as a potential radioprotectant for the small bowel of the rat. SUMMARY BACKGROUND DATA: Vitamin E has previously been shown to provide radioprotection in animal models: increased survival after whole-body irradiation, diminished absorptive malfunction, and modest diminution in postirradiatio
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22. Steel factor influences the distribution and activity of murine hematopoietic stem cells in vivo.
To determine the effects of steel factor (SIF) on the number and distribution of phenotypically defined hematopoietic stem cells in vivo, mice were treated with continuous s.c. infusions of SIF for up to 7 days. The bone marrow demonstrated a transient 5-fold increase in the number of c-kit-positive lineage-negative/low cells with no change in cellularity. T
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23. Radioprotection of human lymphoid cells by exogenously supplied glutathione is mediated by gamma-glutamyl transpeptidase.
Human lymphoid cells depleted of glutathione by treatment with buthionine sulfoximine, a specific inhibitor of gamma-glutamylcysteine synthetase, may be partially repleted by adding glutathione in the medium. The mechanism of repletion involves the action of gamma-glutamyl transpeptidase on exogenous glutathione, transport of products of glutathione metaboli
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24. IκB-kinaseβ-dependent NF-κB activation provides radioprotection to the intestinal epithelium
Acute injury to the intestinal mucosa is a major dose-limiting complication of abdominal radiation therapy. We studied the role of the transcription factor NF-κB in protection against radiation-induced apoptosis in the intestinal epithelium in vivo. We use mice in which NF-κB signaling through IκB-kinase (IKK)-β is selectively ablated in intestinal epith
National Academy of Sciences.