Vibrational and impedance analysis of the β-stannic acid samples plasticized by perchloric acid.

The β-stannic acid powders(I) containing various amounts of perchloric acid with an initial concentration of 56.2 wt% HClO were studied by IR and Raman spectroscopy combined with XRD analysis and impedance spectroscopy. The addition of aqueous perchloric acid to I at room temperature leads to the adsorption compound formation.

Conjugates of natural compounds with nitroxyl radicals as a basis for creation of pharmacological agents of new generation.

Synthesis and research of pharmacological properties of polyfunctional "hybrid" compounds containing fragments of nitroxyl radicals (NR) in a molecule (spin-labeled conjugates) is a rapidly developing area of medicinal chemistry. Many examples of various classes of natural compounds have shown that the introduction of nitroxyl fragment into a molecule leads to either strengthening of biological activity or its modification, decrease of general toxicity, or increase of selective cytotoxicity. The review of the published data on spin-labeled biologically active natural compounds has revealed that various classes of natural compounds, such as anthracycline antibiotics, lignans, triterpene acids, chromanes, flavonoids, stilbenoids, alkaloids, amino acids, etc.

[Health status and physical development in Stavropol' preschool children].

A total of 1097 children aged 2 to 6 years who went to preschool children's facilities in Stavropol were examined. Of them there were 525 (47.7%) boys and 574 (52.