4,539 research outputs found
Uso do azul de toluidina seguido Da quimioluminiscência como método euxiliar de diagnóstico clínco de lesões bucais cancerizáveis
No full textTCC (graduação) - Universidade Federal de Santa Catarina. Centro de Ciências da Saúde. Odontologia.O diagnóstico precoce do câncer de boca é fundamental para elevar as taxas de sobrevida dos pacientes, no entanto, a maioria destas lesões continua sendo diagnosticada nos estágios tardios da doença. Evidências demonstram que o desenvolvimento do câncer bucal está associado ao aparecimento de lesões bucais com potencial de transformação carcinomatosa, conhecidas como lesões cancerizáveis. Deste modo, o desenvolvimento de técnicas que facilitem o diagnóstico clínico adequado destas condições merece destaque. Enfatiza-se a técnica da aplicação do Azul de Toluidina (AT) seguido da Quimioluminiscência (QL), que destaca características de lesões bucais suspeitas de malignidade, facilitando o diagnóstico e monitoramento, além de ajuda na seleção do melhor sítio para biópsia. A amostra foi composta por 50 pacientes adultos portadores de lesões bucais brancas, nos quais se aplicou a técnica em estudo. A área mais corada pelo AT foi biopsiada e os resultados histopatológicos foram comparados aos diagnósticos clínicos. Os resultados mostraram que 95,8% dos resultados histopatológicos foram compatíveis com os clínicos. As áreas mais coradas pelo AT foram as que apresentaram maior grau de displasia epitelial, portanto, maior risco de transformação maligna, o que faz do AT um importante método auxiliar na detecção de lesões suspeitas de malignidade e na seleção de sítios para biópsia. Já o dispositivo de QL melhorou a visualização dos bordos de algumas lesões, mas não acrescentou dados clínicos significativos ao diagnóstico, segundo critérios observacionais
Uso do azul de toluidina seguido da quimioluminiscência como método auxiliar de diagnóstico clínico de lesões bucais cancerizáveis
No full textTCC (graduação) - Universidade Federal de Santa Catarina, Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Curso de Odontologia.O diagnóstico precoce do câncer de boca é fundamental para elevar as taxas de sobrevida dos pacientes, no entanto, a maioria destas lesões continua sendo diagnosticada nos estágios tardios da doença. Evidências demonstram que o desenvolvimento do câncer bucal está associado ao aparecimento de lesões bucais com potencial de transformação carcinomatosa, conhecidas como lesões cancerizáveis. Deste modo, o desenvolvimento de técnicas que facilitem o diagnóstico clínico adequado destas condições merece destaque. Enfatiza-se a técnica da aplicação do Azul de Toluidina (AT) seguido da Quimioluminiscência (QL), que destaca características de lesões bucais suspeitas de malignidade, facilitando o diagnóstico e monitoramento, além de ajuda na seleção do melhor sítio para biópsia. A amostra foi composta por 50 pacientes adultos portadores de lesões bucais brancas, nos quais se aplicou a técnica em estudo. A área mais corada pelo AT foi biopsiada e os resultados histopatológicos foram comparados aos diagnósticos clínicos. Os resultados mostraram que 95,8% dos resultados histopatológicos foram compatíveis com os clínicos. As áreas mais coradas pelo AT foram as que apresentaram maior grau de displasia epitelial, portanto, maior risco de transformação maligna, o que faz do AT um importante método auxiliar na detecção de lesões suspeitas de malignidade e na seleção de sítios para biópsia. Já o dispositivo de QL melhorou a visualização dos bordos de algumas lesões, mas não acrescentou dados clínicos significativos ao diagnóstico, segundo critérios observacionais
Role of plant-derived omega-3 fatty acids in human nutrition
No full textAn international workshop on the role of plant-derived omega-3 fatty acids in human nutrition took place in Milan on February 9, 2000, The meeting was sponsored by the Nutrition Foundation of Italy and was organized by its Scientific Director, Dr. Andrea Poli. It was attended by experts in polyunsaturated fatty acids and human lipid nutrition. This is the first meeting devoted to the health aspects of alpha-linolenic acid, the omega-3 fatty acid contained in plant-derived edible products, as distinct from the more widely studied long-chain omega-3 products typically present in fish and fish-derived products. This report, which is based on updated scientific evidence presented and discussed at the workshop, was prepared by the international expert panel. Copyright (C) 2000 S. Karger AG, Basel
The Treatment of Ties in AP Correlation
No full textThe Kendall tau and AP correlation coefficients are very commonly use to compare two rankings over the same set of items. Even though Kendall tau was originally defined assuming that there are no ties in the rankings, two alternative versions were soon developed to account for ties in two different scenarios: measure the accuracy of an observer with respect to a true and objective ranking, and measure the agreement between two observers in the absence of a true ranking. These two variants prove useful in cases where ties are possible in either ranking, and may indeed result in very different scores. AP correlation was devised to incorporate a top-heaviness component into Kendall tau, penalizing more heavily if differences occur between items at the top of the rankings, making it a very compelling coefficient in Information Retrieval settings. However, the treatment of ties in AP correlation remains an open problem. In this paper we fill this gap, providing closed analytical formulations of AP correlation under the two scenarios of ties contemplated in Kendall tau. In addition,we developed an R package that implements these coefficients.Best Short Paper Accepted author manuscriptMultimedia ComputingWeb Information System
Delamination Analysis of A Class of AP-PLY Composite Laminates
No full textA recently developed fiber placement architecture, AP-PLY, has been shown to give significantly improved damage tolerance characteristics of composite structures. The behavior of delaminations resulting from low speed impact damage is of particular concern. Major attention has been paid to expand current knowledge on the delamination response of simple AP-PLY composite structure and move towards in-depth understanding of the failure mechanisms behind the damage tolerance. This thesis presents the approaches to predict delamination onset and analyze delamination growth, in support of the search of the optimum woven pattern for AP-PLY composite laminates. The recovered interlaminar stress between layers combined with the maximum stress criterion determined the delamination onset of simple AP-PLY composite laminate under out-of-plane loads. 2D finite element models with cohesive elements inserted in the interfaces of woven layers have been built to evaluate the delamination initiation and propagation in the different woven patterns of simple AP-PLY composite beams. The parameters of the woven pattern, such as the woven angle, the number of woven plies, the number of straight filled plies, and the location of the woven patterns in through the thickness direction, were investigated and shown to have a significant effect on delamination creation and growth. An energy method based on beam theory was proposed to analyze the strain energy release rate (SERR) of an existing crack in an AP-PLY beam structure. The developed analytical method was implemented in isotropic materials and the obtained SERR of a crack was validated by reference results and finite element solutions. The general behavior of crack growth on the left or right crack tip was evaluated and basic trends leading to crack propagation on one side of the crack were established. A correction factor was introduced to improve the accuracy of the SERR of a small crack through the numerical calculation. The singularity of crack tip caused by dissimilar materials was investigated and was found that the inclusion of the singularity effect could increase the accuracy for small cracks. It has been shown that the neutral axis needs to be relocated to decouple the bending and membrane behavior of unsymmetrical composite laminates, thus to meet the requirement of minimizing the strain energy of the delaminated beam to calculate the SERR of a delaminated composite beam. The calculated SERR of a crack in a composite beam has been verified by comparing with a finite element model. The woven plies in AP-PLY composite laminate altered the layup and two conventional laminates with different stacking sequences were identified in an AP-PLY composite laminate based on the assumption that the resin areas were ignored. A step by step approach was developed to obtain the SERR of a crack that goes across different materials. The analytical SERR determined when two materials are used in sequence, sets the stage for optimization of AP-PLY composite laminates without taking account of the effect of the resin area. The procedure of optimization of simple AP-PLY pattern was proposed and industry may benefit for many applications. An equivalent stiffness approach was used to model regions containing resin pockets and straight or inclined composite layers. A series of three point bending tests was carried out where the failure process and loading capacity were evaluated. The methodology, procedure of optimization, philosophy outlined in this thesis might also be applied to the more complicated fully woven AP-PLY composite laminates. The work in this thesis contributes to the understanding of the behavior of AP-PLY composite laminates with delaminations
The 1st Congress of the International Society for the Study of Fatty Acids and Lipids (ISSFAL): fatty acids and lipids from cell biology to human disease
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