PURPOSE An in vitro study was conducted to measure the adsorption of major tear film lipids to soft contact lenses over time. METHODS Commercial balafilcon A (PureVision; Bausch & Lomb, Rochester, NY), galyfilcon A (Acuvue Advance; Johnson & Johnson Vision Care), lotrafilcon A and B (Night & Day And O(2)Optix; CIBA Vision, Duluth, GA), senofilcon A (Acuvue Oasys; Johnson & Johnson Vision Care...

a method was developed for removal, preconcentration and spectrophotometric determination of trace amounts of methyl red based on sio2-coated fe3o4magnetic nanoparticles. the influence of ph, dosage of adsorbent and contact time on the adsorption of dye was explored by central composite design. the kinetic data were analyzed based on the langmuir and freundlich adsorption isotherms. the langmui...

Mixed silanes are often used as coupling agents in sizings for glass fibres. A technique has been developed which enables the preferential adsorption of a particular silane onto a model E-glass from a mixed aqueous silane solution to be probed. It is shown that け-Aminopropyltriethoxysilane (APS) is preferentially adsorbed over け-glycidoxypropyltrimethoxysilane (GPS) onto model E-glass fibres. H...

The research focuses on ammonia and phosphate removal from wastewater by using a novel metal microwave-treated clinoptilolite. For increasing adsorption capacity, the samples were calcinated or microwave irradiated in solutions of Fe(III), Cu (II), Ca(II) chlorides. BET-specific surface area measurement revealed that calcination led to decrease 18.254 11.658 m2/g. results fitted theoretical mod...

The adsorption of polyelectrolytes to charged surfaces can be applied to build up multilayers of polyelectrolytes of alternating charge by layer-by-layer assembly. Here, poly-(allylamine hydrochloride) (PAH) is adsorbed to colloidal latex particles in aqueous solution, and to particles precoated with four layers of polyelectrolytes. The method of H NMR transverse relaxation is applied to monito...

The current imbalance in the biogeochemical cycle of nitrogen is as serious as that of carbon. One way to mitigate this problem is through the electrochemical reduction of nitrates under mild conditions, which is an appealing though not fully understood process. Therefore, deeper insight into the electrocatalytic reaction mechanism is needed to optimize this process. Here we thoroughly analyse ...

The fluorescence of the single tryptophan (Trp69) of cutinase from Fusarium solani pisi, free in aqueous solution and adsorbed onto the surface of poly(methyl methacrylate) (PMMA) latex particles, was studied at pHs of 4.5 and 8.0. The monodisperse PMMA particles (d=106.0+/-0.1 nm) were coated with a quite compact monolayer of cutinase at both pH values. The Trp decay curve of the folded free c...

The biosynthetic thermoplastic poly-4-hydroxybutyrate (P4HB) possesses favorable tensile strength and elongation performance and has been studied as a new implantable polymer material for medical uses. However, its hemocompatibility has not been tested to confirm its applicability to tissue engineering. In this study, a series of experiments was performed that included erythrocyte hemolysis tes...

Three strains of Pseudomonas fluorescens with different motility rates and adsorption rate coefficients were injected into porous-medium reactors packed with l-mm-diameter glass spheres. Cell breakthrough, time to peak concentration, tailing, and cell recovery were measured at three interstitial pore velocities (higher than, lower than, and much lower than the maximal bacterial motility rate). ...

After biological treatment, coke wastewater contains small amounts of phenolic compounds resistant to such treatment. The removal of phenols and COD from coke wastewater subjected to biological treatment was studied. The adsorbents used were granular activated carbon and the resins XAD-2, AP-246 and OC-1074. Equilibrium, kinetics and column assays were carried out, fitting the equilibrium data ...