507 resultados para root vole (Microtus oeconomus L.)


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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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The first search at the LHC for the extinction of QCD jet production is presented, using data collected with the CMS detector corresponding to an integrated luminosity of 10.7 fb-1 of proton-proton collisions at a center-of-mass energy of 8 TeV. The extinction model studied in this analysis is motivated by the search for signatures of strong gravity at the TeV scale (terascale gravity) and assumes the existence of string couplings in the strong-coupling limit. In this limit, the string model predicts the suppression of all high-transverse-momentum standard model processes, including jet production, beyond a certain energy scale. To test this prediction, the measured transverse-momentum spectrum is compared to the theoretical prediction of the standard model. No significant deficit of events is found at high transverse momentum. A 95% confidence level lower limit of 3.3 TeV is set on the extinction mass scale.

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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The usefulness of fluoride-releasing restorations in secondary caries prevention may be questioned because of the presence of other common sources of fluoride and because of ageing of the restorations. This study tested the hypothesis that glass-ionomer cement restorations, either aged or unaged, do not prevent secondary root caries, when fluoride dentifrice is frequently used. Sixteen volunteers wore palatal appliances in two phases of 14 days, according to a 2 x 2 crossover design. In each phase the appliance was loaded with bovine root dentine slabs restored with either glass-ionomer or resin composite, either aged or unaged. Specimens were exposed to cariogenic challenge 4 times/day and to fluoridated dentifrice 3 times/day. The fluoride content in the biofilm (FB) formed on slabs and the mineral loss (Delta Z) around the restorations were analysed. No differences were found between restorative materials regarding the FB and the Delta Z, for either aged (p = 0.792 and p = 0.645, respectively) or unaged (p = 1.00 and p = 0.278, respectively) groups. Under the cariogenic and fluoride dentifrice exposure conditions of this study, the glass-ionomer restoration, either aged or unaged, did not provide additional protection against secondary root caries. Copyright (c) 2006 S. Karger AG, Basel.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV