A new brush-type HPLC chiral stationary phase (CSP) comprising π-acidic N-(3,5-dinitrobenzoyl)-D-α-phenylglycine chiral units bound to the quinoxaline units of modified γ-aminopropyl silica gel by a 1,2-diaminoethane spacer has been prepared by solid-phase synthesis. To test the CSP attempts were made to separate the enantiomers of twenty-two racemates with different functional groups and the r...

Introduction: Orthodontic treatment can cause difficulties in maintaining good oral hygiene leading to the accumulation of dental plaque, gingival inflammation, periodontal disease, and caries. This study aimed to evaluate the efficacy of three different tooth brushing techniques on the prevention of periodontal diseases in patients with fixed orthodontics treatment. Materials and Methods:In t...

Block copolymers are macromolecular surfactants that self-assemble into a variety of nanostructural elements or reduce the interfacial tension between incompatible polymers. Here, we examine the ability of diblock copolymers differing in composition to stabilize bilayered homopolymer nanolaminates on flat solid supports. In this arrangement, self-assembly competes with interfacial modification ...

Poly(acrylic acid) polyelectrolyte brushes were synthesized by surface-initiated atom transfer radical polymerization (SI-ATRP) of tert-butyl acrylate on planar gold surfaces and subsequent hydrolysis. Three types of monolayers with different numbers of thiol binding sites per initiating unit were used. The binding strength to the gold surface turned out to be of crucial importance for the form...

In this work, a method to assemble nanoscale hybrid solar cells in the form of a brush of radially oriented CdS nanowire crystals around a single carbon fiber is demonstrated for the first time. A solar cell was assembled on a carbon fiber with a diameter of ~5-10 μm which served as a core electrode; inorganic CdS nanowire crystals and organic dye or polymer layers were successively deposited o...

PURPOSE To evaluate the plaque- and gingivitis-reducing efficacy of a newly developed multi-directional power toothbrush in comparison to a commercially-available sonic power toothbrush. METHODS Adult subjects with mild-to-moderate gingivitis were eligible for this 4-week, randomized and controlled, single-center, examiner-blinded, parallel group study. At baseline, plaque and gingivitis stat...

Full-body, unencumbered, gestural interfaces o er new possibilities for computer painting tools. However, traditional painting metaphors and current gestural input technology are not well suited to one another; the user cannot be tracked with su cient accuracy to support brush-like or pen-like painting. Our approach to this problem has been to interpose di erent layers of abstraction between in...

We propose an adaptation of the osmotic stress technique for determining equations of state of colloids covered by polymer films. We describe here the case of silica particles covered by 6 or 7 layers of polyelectrolyte multilayers. The establishment of a pressure-distance curve allows the interpretation of colloidal interactions over more than four orders of magnitude in pressure. This large r...

The predictions of turbulent burning velocity parameterizations for non-unity Lewis number flames have been assessed based on a single-step chemistry Direct Numerical Simulation (DNS) database premixed Bunsen different values characteristic numbers ranging from 0.34 to 1.2. It has found that the definition is strongly dependent choice projected flame brush area in burner configuration. highest ...

PURPOSE To assess the ability of a novel multi-directional power toothbrush to control plaque and gingivitis when compared to a marketed sonic power toothbrush control. METHODS This was a randomized and controlled, examiner-blinded, parallel group, 8-week study at a single center, in adult subjects with mild-to-moderate gingivitis. Pre-treatment gingivitis levels and plaque coverage were eval...