The character of radionuclide contamination of natural lakes at the territory of the Semipalatinsk test site.

The paper presents data on the research of the radionuclide contamination redistribution in the ecosystems of natural lakes at the Semipalatinsk test site and adjacent territories. Natural lakes, which are the research objects, are located on the territory of the test sites, in the zone of their influence, in the zone impacted by radioactive fallout or in the "background" territories. Sampling of water, bottom sediments and plants was carried out, in which the content of radionuclides Am, Cs, Sr and Pu was determined.

[The stability of vitamin C in powdered mixes for beverages].

Factors influencing vitamin C stability in powder mixtures for beverages were studied and the main ways of its decomposition in products preserved in glass containers or paper packages covered with polymeric film were established. The phenomenon of vitamin C self-stabilization has been observed.

[Entomophthorosis of Culex pipiens (Culicidae) mosquitoes breeding in basements].

Foci of mycosis of C. p. pipiens and C.

[Role of E. coli 06 in the epidemiology of acute intestinal diseases].

The authors demonstrated the etiological role of E. coli 06 in group acute intestinal diseases with the clinical picture of food poisoning. The leading role of the food factor in the spread of this infection was established.