Antiradical Activity of Porphyrins with a Diisobornylphenol Fragment at the Macrocycle Periphery.

This article focuses on the antiradical activity of a number of 2,6-diisobornylphenol-porphyrin conjugates with various spacers between the porphyrin and phenolic fragments in the model reaction of ethylbenzene oxidation initiated by azoisobutyric acid dinitrile. The study has shown that the electronic effects of the groups directly related to the 2,6-diisobornylphenol fragment exert the predominant influence both on the reactivity of the phenolic hydroxyl group in interaction with free radicals and on the antiradical activity of the molecule as a whole. The antiradical activity of the molecule is generally less affected by the nature of the substituents in the porphyrin macrocycle, mainly due to a change in the stoichiometric inhibition coefficient in the presence of relatively easily oxidizable groups.

[Results of intraocular lens implantation on top of the anterior capsule in cases of phaco complications].

Unlabelled: Posterior capsule rupture during cataract extraction requires that the intraocular lens (IOL) implanted on top of the capsular bag was stable and well-centered. The objective of this study was to evaluate the results of Rayner C-flex aspheric and M-flex aspheric (United Kingdom) IOLs implantation on top of the capsular bag and their stability in patients with phaco complications.

Material And Methods: A total of 2556 phacoemulsification cases were analyzed.

[Lecithin influence on the effectiveness of the antioxidant effect of flavonoids and alpha-tocopherol].

Influence of the widely used food supplement lecithin on the effectiveness of the inhibiting effect of the natural antioxidants (quercitin, dihydroquercitin, and alpha-tocopherol) has been studied in dependence of the rate of free radicals generation in the model oxidation reactions. It has been found that during the initiated and autoxidation of methyl oleat, lecithin decreased the antioxidant effectiveness of flavonoids. The effect value increased with the lecithin concentration increase.

[Effect of lecithin on the inhibitory efficiency of alpha-tocopherol during methyl oleate oxidation].

It has been established that the effect of lecithin on the oxidation of methyl oleate depends on the rate of the free radical initiation: lecithin does not affect the reaction rate at high rates of radical initiation (the initiated oxidation) and accelerates the oxidation at low rates (autooxidation), causing the reduction of the induction period. The inhibitory action of mixtures of lecithin and the natural antioxidant alpha-tocopherol depends on the concentrations of both alpha-tocopherol and lecithin at different rates of oxidation. The inhibitory efficiency of mixtures with low concentrations of alpha-tocopherol is close to additive.

[Study of an accommodational response after surgical correction of myopia with an ICL intraocular lens].

The paper analyzes the nature of an accommodational response in 11 patients (19 eyes) before and after surgical correction of myopia with ICL intraocular lenses (IOLs). Rapid and slow accommodational responses were studied to different values of an accommodation stimulus (from 1.0 to 3.