objectives : the aim of this in-vitro experimental study was to assess the effect of application of a desensitizing varnish on the enamel and dentin marginal seal. materials and methods: seventy-two freshly extracted, intact human premolar teeth were divided into four groups (n=18). class v cavities (3mm in length, 2mm in width and 2mm in depth) were prepared on the buccal surface of each tooth...

The adsorption of dyes in the solutions using activated sludge might be a promising approach in wastewater treatment units. The adsorption of Basic Red 18 and Basic Blue 9 from aqueous solution by dried activated sludge was investigated with in a batch system. The activated sludge had the highest dye uptake capacity, having the monolayer adsorption capacity 285.71 and 256.41 mg g(-1) for Basic ...

The composition, with respect to nucleic acids, of the L.E. bodies resulting from the action of the plasma of patients with systemic lupus erythematosus on substrate leukocyte nuclei in different kinds of preparations was compared microspectrophotometrically with that of control lymphocyte nuclei. Binding of the basic dye methyl green to DNA was uniformly found to be depressed in L.E. bodies as...

background and aims. bleaching may exert some negative effects on existing composite resin restorations. the aim of this study was to evaluate the effect of home bleaching on microleakage of fiber-reinforced and particle-filled composite resins. materials and methods. ninety class v cavities (1.5×2×3 mm) were prepared on the buccal surfaces of 90 bovine teeth. the teeth were randomly divided in...

Basic redox dyes, such as methylene blue, induce a loss of K(+) from yeast cells. The maximal loss, rather than the rate of loss, is related to the dye concentration, the response following a normal distribution on a plot of log-dose, versus percentage loss of K(+). This fact taken together with the observed correlation between K(+) loss and frequency of staining (as measured by microscopic obs...

The adsorption of basic dye (i.e., ethyl violet or basic violet 4) from aqueous solution onto the regenerated spent bleaching earth (RSBE) was carried out by varying the process parameters such as initial concentration, pH, and temperature. As analytical comparisons, activated bleaching earth (ABE) was also used as adsorbent for the adsorption of the basic dye at various initial concentrations....

Background and Objectives: Extended-pulse dye lasers (EPDL) are commonly used to treat a variety of vascular lesions. This study evaluated whether differences in pulse formats and cooling methods might affect outcome in the treatment of small facial telangictasia. Study Design/Materials and Methods: Ten subjects presenting with symmetric, bilateral facial telangiectasia were studied. Each side ...

"In the years immediately following the invention of the laser, its potential for application to the study of a broad class of physical and chemical problems was perceived by many people. However, the use of early lasers in these studies was severely constrained by the limited number of available wavelengths. In 1966 P. P. Sorokin and, independently, F. P. Schafer, demonstrated that stimulated ...