A model was developed to describe the overall dissolution kinetics of semicrystalline PVA gels prepared by freezing and thawing techniques. The dissolution process was described as a three-step mechanism: detachment-, diffusion-, and disentanglement-controlled dissolution. The unfolding of crystalline regions due to detachment and diffusion was calculated. The lamellar thickness of a PVA crysta...

Corneal thickness changes were monitored in ten subjects (1) over a 36-hour period without contact lens wear and (2) during 7 days continuous wear of three types of hydrogel contact lenses of different back vertex powers. Measured on awakening, the mean overnight central corneal edema without lenses was 3.0% ± 1.2%. With the lenses used in this study, the mean overnight corneal swelling over th...

PURPOSE To determine whether maintenance of corneal hydration is dependent on bicarbonate ions and whether these ions can be derived from metabolic or exogenous CO2, and to investigate the relationship of transendothelial fluid movement to control of hydration. METHODS The thickness of intact or deepithelialized rabbit corneas was measured while superfused on the endothelial surface with eith...

the use of agriculture residues as filler in composites is increasing due to their strength, abundance and low cost. soya stalks show promising renewable natural fiber. in polyethylene composites the physical and mechanical properties (flexural resistance, tensile, impacted absorbed energy, water uptake and thickness swelling) was examined at different composites. the results showed that, the m...

Abstract
 This study aims to determine the effect of concentration stearic acid and cellulose from tapioca processing solid waste on characteristics foam biocomposite glucomannan optimal so as produce best biocomposite. used a randomized block design with two factors. Factor I is which consists 3 levels (2% ; 4% 6%). II maleic anhydride (2.5%; 5%; 7.5%). The variables observed were tensile...

The surface V3 of the denuded corneal stroma was separated into the anterior and posterior segments; the swelling ratio of each was compared under zero pressure. In the rabbit, cat, and bovine corneas, the anterior segment was less hydrophilic than the posterior one, in both the central and peripheral regions. In the rabbit cornea, the swelling ratio of the posterior segment was significantly l...

garlic and onions as dietary constituents and medicines have been used for many disorders which dates back to the early civilization. it has been shown that different species of allium have immunomodulating effects. in this study, we sought to determine if methanolic and chloroformic extracts of allim fistulosum l. (leek) have any effect on cell-mediated immune response in mice. methanolic and ...

the aim of this study was to explore the minimum amount of urea formaldehyde (uf) resin content and optimum particleboard density while maintaining boards’ quality to reduce production costs. board density at three levels (520, 620 and 720 kg m-3) and resin content (6, 7 and 8%) were variable parameters. stepwise multivariate linear regression models were used to evaluate the influence of board...

in this research the utilization of acacia wood (acacia salicina) in medium density fiber board production was investigated. sample boards were made from acacia fibers at two resin contents (10, 12%), two press temperatures (175, 185 ˚c) and three press times(3, 4, 5 min). the results were analyzed based on a complete randomized design (crd) under a factorial experiment. results revealed that i...

The use of agriculture residues as filler in composites is increasing due to their strength, abundance and low cost. Soya stalks show promising renewable natural fiber. In polyethylene composites the physical and mechanical properties (flexural resistance, tensile, impacted absorbed energy, water uptake and thickness swelling) was examined at different composites. The results showed that, the m...