X Ray Densitometry
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. Dendrocronologia de árvores de mogno, Swietenia macrophylla King., Meliaceae, ocorrentes na floresta tropical Amazônica do Departamento de Madre de Dios, Peru / Dendrochronology of the mahogany trees, Swietenia macrophylla King., Meliaceae, occurring in the Amazon Rainforest of the Department of Madre de Dios, Peru
Studies in phenology and wood anatomy show a cyclical development and growth related to climatic conditions (temperature and rainfall) and site characteristics (competence, light, water storage in the soil, etc.), the sensibility to these factors results, for some tree species, in seasonality of cambium activity and formation of annual tree-rings. This chara
Publicado em: 2009
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14. Caracterização da estrutura anatômica do lenho, dos anéis de crescimento e dos canais de resina de árvores de Pinus caribaea var. hondurensis Barr. et Golf. / Characterization of the anatomical structure of the wood, the growth rings and the resin ducts in Pinus caribaea var. hondurensis Barr. et Golf.
The research on resin tapping trees with pine species have shown the effect of factors that affect the production and quality of resin, related with the species, genetic variability, growth rate, age, forest management, etc.. The gum-resin extraction practices, the concentration, frequency of application of chemical stimulants, the time of year that panels a
Publicado em: 2009
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15. Erros inter e intra-tÃcnicos na qualificaÃÃo da densidade Ãssea
Uma das tÃcnicas mais utilizadas para o monitoramento da densidade mineral Ãssea (DMO) Ã a absortometria de raio-X de dupla energia (AXDE), no entanto, suas limitaÃÃes sÃo pouco consideradas. Assim, os objetivos deste estudo sÃo 1) comparar, separadamente, as trÃs anÃlises feitas pelo software e por dois tÃcnicos, referentes a trÃs exames de AXDE,
Publicado em: 2007
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16. Electrical field stimulation improves bone mineral density in ovariectomized rats
Osteoporosis and its consequent fractures are a great social and medical problem mainly occurring in post-menopausal women. Effective forms of prevention and treatment of osteoporosis associated with lower costs and the least side effects are needed. Electrical fields are able to stimulate osteogenesis in fractures, but little is known about their action on
Brazilian Journal of Medical and Biological Research. Publicado em: 25/10/2006
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17. Evaluation of drying period and quality of image of radiographs submitted to immersion in ethyl alcohol at different concentrations / Avaliação do tempo de secagem e da qualidade da imagem de radiografias submetidas a banho em alcool etilico em diferentes concentraçãoes
This study evaluated the action of ethyl alcohol at concentrations of 46ºGL, 70ºGL and 92ºGL as an accelerator of drying of dental radiographs, with a view to reduce the time required for processing. Also, it was observed whether this product might cause alterations in the density, sensitometric properties and quality of these radiographs after a 6- month
Publicado em: 2005
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18. Anéis de crescimento de árvores de Araucaria columnaris Hook.: caracterização anatômica, densitométrica e aplicação no monitoramento ambiental / Tree rings of Araucaria columnaris Hook: anatomical and densitometrical characterization and environmental monitoring applicability
The present work has the aim to characterize the micro anatomical features of the tree rings of the A. columnaris, determinate the age and the growth rate, analyze the lead concentration in a tree ring sequence previously dated and to verify the applicability of the this specie in the environmental monitoring using the dendrochemistry techniques. It is defin
Publicado em: 2005
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19. v Effects of aging and osteoporosis on thoracic kyphosis, on proprioception and on trunk muscle torque. / Efeitos do envelhecimento e da osteoporose na cifose torácica, na propriocepção e no torque dos músculos do tronco.
The aim of this study was to evaluate the effects of aging and osteoporosis on thoracic kyphosis degree, on extensors and flexors trunk muscles torque and on proprioception. Moreover, this study investigated the possible correlation among the variables studied in this work. It was evaluated 40 voluntary women, divided in four distinct groups: Young Group (10
Publicado em: 2005
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20. Tibial dyschondroplasia and bone mineral density
This study was carried out at Faculdade de Medicina Veterinária e Zootecnia, UNESP, Botucatu-SP, Brazil. The aim was to establish the normal values of bone mineral density (BMD) expressed in millimeters of aluminum in the tibia of broiler chickens using optical densitometry of radiographs. Four hundred Cobb male chicks were reared from 1 to 40 days of age,
Revista Brasileira de Ciência Avícola. Publicado em: 2004-12
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21. Análise do risco de fratura óssea por ultrasonometria e ensaio mecânico de compressão / Analysis of bone fracture risk using ultrasonometry and mechanical compression essays
Osteoporosis is a disease that affects bone tissue and is characterized by a decrease in its mass and deterioration of its architeture. The current method used in osteoporosis diagnostic is bone densitometry (DEXA- Dual Energy X-ray Absorption), which utilizes ionizing radiation. Various studies have been published discussing alternatives or complimentary te
Publicado em: 2004
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22. Avaliação de fatores determinantes da densidade mineral ossea areal na sindrome de Turner : estudo transversal de 58 casos
Turner syndrome (TS) is an abnormality of the X ehromosome, characterized mainly by endogenous estrogen deficieney and short stature. Most bone density studies in patiens with TS have presented osteoporosis as a consequence of the absence of pubertal development and low estrogen levels. However, intrinsie factors of bone changes related to TS have not been c
Publicado em: 2001
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23. Otimização da tecnica de densitometria optica em imagens radiograficas de peças osseas : estudo "in vitro"
This experiment was designed in order to determine the sensibility and precision of radiographic optical densitometry by the characteristic curves setorization of radiographics films. We used the mathematic expression describted by PELÁ et aI. (1990), a special computer software (PELÁ et aI., 1992) adapted for to this analysis and the correction of X radia
Publicado em: 1994
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24. Correlation of regional densitometry patterns, radiological appearances, and pulmonary function tests in chronic bronchitis and emphysema
In 20 male patients suffering from chronic bronchitis and emphysema investigated by pulmonary x-ray densitometry, five different types of densitometer trace pattern were observed during the FEV manoeuvre, which appeared to be related to the degree of zonal airway obstruction and the radiological severity of emphysema. We thought some of the features of the t