Separate detection of homologous surfactants by means of solid-contact unmodified and modified with molecular sieves potentiometric sensors.

To improve the selectivity of surfactant sensors, the surface of their membranes was modified with molecular sieves with predetermined pore sizes. Water-soluble anionic, cationic and non-ionic surfactants were used as pore generators in the molecular sieves and introduced into the source membrane at the stage of its formation. The modified sensors enable detection of alkylsulfates homologues and alkylpyridinium with different lengths of the hydrocarbon chain (C(10)-C(18)); homologous poly(oxyethylated nonylphenols) differing in the number of oxyethyl groups (m=10-100).

[Surgical treatment in parasternal diaphragmatic hernias].

The article presents an analysis of experiences with surgical treatment of 26 patients with parasternal diaphragmatic hernias for the period from 1969 till 1999. In most cases (88.5%) right localization was noted.

[Risk factors in the development of fibro-cavernous pulmonary tuberculosis and its outcomes].

A number of social and clinical factors has been revealed which contribute to the development of fibrocavernous pulmonary tuberculosis in patients under the present conditions (alcoholism in 56%, inadequate treatment 52%, serious concurrent diseases 48.2%, unsatisfactory material and living conditions 51.1%).