Rapid Detection and Quantification of Five Periodontopathic Bacteria by Real-Time PCR
摘要:
AbstractThe quantity of periodontopathic bacteria in plaque samples is an important determinant for understanding the etiologic role of bacteria. The real‐time PCR method was used to detect and quantify periodontopathic bacteria, such as Actinobacillus actinomycetemcomitans, Bacteroides forsythus, Porphyromonas gingivalis, Treponema denticola, and Treponema socranskii, in saliva and subgingival plaque samples. There was good agreement between the results of conventional PCR and real‐time PCR methods. Using the LightCycler™ system we were able to determine the amount of periodontopathic bacteria within an hour. The real‐time PCR method was linear for samples containing from 103 to more than 108 cells (r2=0.999). The application of the real‐time PCR method should be useful in the rapid detection and quantification of periodontopathic bacteria in clinical samples.
The finite‐element method (FEM) is used to study the influence of porosity and pore shape on the elastic properties of model porous ceramics. Young's modulus of each model is practically independent of the solid Poisson's ratio. At a sufficiently high porosity, Poisson's ratio of the porous models converges to a fixed value independent of the solid Poisson's ratio. Young's modulus of the models is in good agreement with experimental data. We provide simple formulas that can be used to predict the elastic properties of ceramics and allow the accurate interpretation of empirical property–porosity relations in terms of pore shape and structure.
DE850751
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