224 research outputs found
Quantitative image of fluorescence of ceramic and resin-cement veneers
The main of the study was quantify the effect of two ceramics with two underlying resin cements on apparent fluorescence levels. Buccal surfaces of two bovine incisors were ground flat producing one enamel and one dentin substrate. The veneers were fabricated (0.5 and 1.0 mm thickness) using two ceramics (IPSe. max Press and IPSe. max Zirpress, Ivoclar Vivadent). Veneers were cemented using either light-cured (Variolink II, Ivoclar Vivadent) or self-adhesive dual (Rely X U200, 3M ESPE) cement. The layered Control group materials had no cement application. Semi-quantitative fluorescence image analysis (Matlabs software, Matworks) involved processing the images as captured under each daylight (DL, Gretagmacbeth) and ultraviolet illuminants (UVA, Sylvania) within a neutral-gray lightbox (Macbeth Spectral Light). Statistical analysis of the quantitative fluorescence values was performed using two-way ANOVA and Tukey's test (p < 0.05). The e. max Zirpress on the dentin substrate produced greater fluorescence (p < 0.05) when subjected to UV illumination and more fluorescence (p < 0.05) than e. max Press in both cement groups. Light-cured cement produced higher (p < 0.05) fluorescence than the dual-cement with e. max Press on enamel under UV illumination. The fluorescence for e. max Press on the dentin substrate was greater (p < 0.05) than for e. max Zirpress using dual self-adhesive cement subjected to daylight illumination. Thus, it is possible to conclude that the combination of ceramic and cement produce definite, significant effects on the apparent fluorescence, vital quality for restorative dentistry3
Towards NNLO Accuracy in the QCD Sum Rule for the Kaon Distribution Amplitude
We calculate the and gluon radiative
corrections to the QCD sum rule for the first Gegenbauer moment of the
kaon light-cone distribution amplitude. The NNL0 accuracy is achieved for the
perturbative term and quark-condensate contributions to the sum rule. A
complete factorization is implemented, removing logarithms of -quark mass
from the coefficients in the operator-product expansion. The sum rule with
radiative corrections yields a_1^K(1 \GeV)=0.10\pm 0.04.Comment: 14 pages, 2 figure
Reduction of blood nitric oxide levels is associated with clinical improvement of the chronic pelvic pain related to endometriosis
The objective of this prospective study was to determine the plasma levels of nitric oxide (NO) in women with chronic pelvic pain secondary to endometriosis (n=24) and abdominal myofascial pain syndrome (n=16). NO levels were measured in plasma collected before and 1 month after treatment. Pretreatment NO levels (μM) were lower in healthy volunteers (47.0±12.7) than in women with myofascial pain (64.2±5.0, P=0.01) or endometriosis (99.5±12.9, P<0.0001). After treatment, plasma NO levels were reduced only in the endometriosis group (99.5±12.9 vs 61.6±5.9, P=0.002). A correlation between reduction of pain intensity and reduction of NO level was observed in the endometriosis group [correlation = 0.67 (95%CI = 0.35 to 0.85), P<0.0001]. Reduction of NO levels was associated with an increase of pain threshold in this group [correlation = -0.53 (-0.78 to -0.14), P<0.0001]. NO levels appeared elevated in women with chronic pelvic pain diagnosed as secondary to endometriosis, and were directly associated with reduction in pain intensity and increase in pain threshold after treatment. Further studies are needed to investigate the role of NO in the pathophysiology of pain in women with endometriosis and its eventual association with central sensitization.484363369CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQSem informaçã
The 16th moment of the three loop anomalous dimension of the non-singlet transversity operator in QCD
We present the result of the three loop anomalous dimension of non-singlet
transversity operator in QCD for the Mellin moment N=16. The obtained result
coincides with the prediction from arXiv:1203.1022 and can serve as a
confirmation of the correctness of the general expression for three loop
anomalous dimension of non-singlet transversity operator in QCD for the
arbitrary Mellin moment.Comment: 7 pages, 1 figure, minor changes in the tex
Supersymmetric Extension of the Lorentz and CPT-Violating Maxwell-Chern-Simons Model
Focusing on gauge degrees of freedom specified by a 1+3 dimensions model
hosting a Maxwell term plus a Lorentz and CPT non-invariant Chern-Simons-like
contribution, we obtain a minimal extension of such a system to a
supersymmetric environment. We comment on resulting peculiar self-couplings for
the gauge sector, as well as on background contribution for gaugino masses.
Furthermore, a non-polynomial generalization is presented.Comment: revtex4, 4 pages, no figure
Anomalous dimensions and phase transitions in superconductors
The anomalous scaling in the Ginzburg-Landau model for the superconducting
phase transition is studied. It is argued that the negative sign of the
exponent is a consequence of a special singular behavior in momentum space. The
negative sign of comes from the divergence of the critical correlation
function at finite distances. This behavior implies the existence of a Lifshitz
point in the phase diagram. The anomalous scaling of the vector potential is
also discussed. It is shown that the anomalous dimension of the vector
potential has important consequences for the critical dynamics in
superconductors. The frequency-dependent conductivity is shown to obey the
scaling . The prediction is
obtained from existing Monte Carlo data.Comment: RevTex, 20 pages, no figures; small changes; version accepted in PR
Incidência de ferrugem em folhas de pessegueiro e nectarineira do germoplasma IAC
The occurrence of rust leaf disease (Tranzschelia discolor f. sp domesticae) was verified in 24 peach and nectarine selections at the Jundiaí Experimental Station (23°08'S and 46°55'W) State of São Paulo, Brazil. The trees of the germoplasm bank were evaluated using a sympton scale to evaluate selection susceptibility to the pathogen, at different levels. The less susceptible selections were: 1) peaches 'Regis' and IAC 4685-45 and 2) nectarines 'Josefina' and IAC N 2680-91.Avaliou-se, em fins do verão de 1993, o grau de incidência da ferrugem (Tranzschelia discolor f. sp. domesticae), em dezoito seleções IAC de pessegueiro e seis de nectarineira, mantidos em lote de germoplasma na Estação Experimental de Jundiaí (23°08'S; 46°55'W). A porcentagem de incidência do patógeno foi estimada através de observações macroscópicas das folhas, atribuindo-se notas de 1 a 5 (1 = nula, 2 = leve, 3 = moderada, 4 = severa, 5 = muito severa), conforme o grau da severidade do sintoma. Todo o material pesquisado mostrou-se suceptível ao patógeno, entretanto, as seleções apresentaram sensíveis variações em graus de susceptibilidade. As seleções com maior tolerância ao patógeno foram: 1) pêssegos 'Régis' e IAC 4685-45 e 2) nectarinas 'Josefina' e IAC N 2680-91
Pegamento da enxertia em diferentes combinações de variedades e espécies utilizadas como copa e como porta-enxertos de maracujazeiro
Economic analysis of an agrosilvipastoral system for a mountainous area in Zona da Mata Mineira, Brazil
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