Argon Ion Laser
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Influence of photo-activation source on enamel demineralization around restorative materials
This study evaluated the effects of the photoactivation source and restorative material on the development of caries-like lesions on human enamel after an in vitro pH challenge. Enamel cavities were prepared in 36 blocks, which were assigned to two groups according to the restorative material: resin-modified glass ionomer (RMGI) and composite resin (CR). Sam
Braz. oral res.. Publicado em: 01/03/2013
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2. Avaliação da influência das fontes de ativação na profundidade de polimerização de materiais restauradores e seus efeitos na resistência á desmineralização do esmalto. / Evaluation of the influence of sources of activation in depth of cure restorative materials and their effects on resistance to demineralization esmalto.
profundidade de polimerização de materiais restauradores e seus efeitos na resistência à desmineralização do esmalte. Dezoito dentes humanos foram seccionados em trinta e seis blocos. Cavidades foram realizadas e os dentes foram divididos em 2 grupos de acordo com o material restaurador (n=18): ionômero de vidro modificado por resina - IVRM (Vitremer-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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3. Effect of active sources in microhardness restorations and composite resin-modified glass ionomer resin and cariostatic. / Efeito de fontes ativadoras na microdureza de restaurações de resina composta e ionômero de vidro modificado por resina e potencial cariostático.
O objetivo desse estudo foi avaliar os efeitos das fontes de ativação e de materiais restauradores após desafio ácido in vitro por meio de microdureza de esmalte humano e o grau de polimerização indireto dos materiais restauradores. Dentes humanos foram seccionados em trinta e seis blocos. Cavidades de 1,6mm foram realizadas com pontas diamantadas. Os
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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4. Como as tecnicas restauradoras podem influenciar na qualidade das restaurações esteticas : avaliação da microdureza, selamento marginal e resistencia de união
The development of new restorative adhesive techniques has continuously advanced resulting in huge changes in the adhesive Dentistry. Thus, in this study it was evaluated the influence of some factors involved during the photoactivation procedures on the marginal adaptation and microhardness of Class II resin composite restorations; it was also investigate t
Publicado em: 2005
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5. Argon Ion Laser Atheroablation: Influence of Plaque Composition
This study quantifies the relationship between exposure time, depth of penetration, extent of lateral and deep cellular disruption (LCD and DCD, respectively), and the intrinsic resistance of different grades of atherosclerotic plaque. Argon ion laser atheroablation (AILA) was accomplished via a 200-μ quartz fiber using 2.0 and 5.0 watts of power for standa
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6. Argon laser photocoagulation of fluorescein stained retina--an unrecognised hazard?
Sodium fluorescein staining of the retina following fluorescein angiography may affect the absorption characteristics of argon ion laser photocoagulation. This hypothesis was investigated by performing laser photocoagulation on control and fluorescein stained porcine retinas. The resultant damage was viewed by scanning electron microscopy. In both specimens,
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7. High-resolution laser desorption mass spectrometry of peptides and small proteins.
Matrix-assisted laser desorption/ionization (MALDI) has been used with an external ion source Fourier-transform mass spectrometer to obtain the highest mass resolution ever, to our knowledge, demonstrated for laser-produced ions (m/delta m = 1,100,000 for [Arg8]vasopressin, 228,000 for melittin, and 90,000 for bovine insulin). The peaks in the isotope cluste
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8. Tunable Laser Resonance Raman Spectroscopy of Bacteriorhodopsin
Bacteriorhodopsin is a rhodopsin-like protein found in the cell membrane of Halobacterium halobium. It shows an absorption maximum at 570 nm and, in the light, undergoes cyclic spectral changes which include a relatively long-lived complex absorbing maximally at 412 nm. Excitation profiles have been obtained with several laser frequencies for two vibrations
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9. Kinetics of the alkaline tetramer leads to dimer dissociation in liganded human hemoglobin: a laser light-scattering stopped-flow study.
The first-order dissociation of tetrameric HbCO to the dimer has been studied overthe pH range 10.30-11.57 in a light-scattering stopped-flow apparatus using argon-ion laser excitation. The first-order dissociation rate constant varies from 0.25 sec-1 to 24.0 sec-1over this pH interval. A semilogarithmic plot of k versus pH has a slope of 2.56 at pH 11.07, t
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10. Photosensitized destruction of human bladder carcinoma cells treated with chlorin e6-conjugated microspheres.
A photosensitizer conjugate, chlorin e6 (Ce6) covalently bound to 1-micron-diameter polystyrene microspheres, has been investigated in the photodynamic destruction of MGH-U1 human bladder carcinoma cells in vitro. The microspheres were taken up avidly by the carcinoma cells; confocal laser scanning fluorescence microscopy showed them to be localized in the c
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11. New energy transfer dyes for DNA sequencing.
We have synthesized a set of four energy transfer dyes and demonstrated their use in automated DNA sequencing. The donor dyes are the 5- or 6-carboxy isomers of 4'-aminomethylfluorescein and the acceptor dyes are a novel set of four 4,7-dichloro-substituted rhodamine dyes which have narrower emission spectra than the standard, unsubstituted rhodamines. A rig
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12. Bacterial viability and antibiotic susceptibility testing with SYTOX green nucleic acid stain.
A fluorescent nucleic acid stain that does not penetrate living cells was used to assess the integrity of the plasma membranes of bacteria. SYTOX Green nucleic acid stain is an unsymmetrical cyanine dye with three positive charges that is completely excluded from live eukaryotic and prokaryotic cells. Binding of SYTOX Green stain to nucleic acids resulted in