[Estimation of the total and active microbial biomass in burial mound paleosoils of a different age].

Microorganisms that were isolated from steppe soils buried below kurgans from 5800 to 750 years ago were analyzed for the completeness of isolation, total biomass (the sum of glucose-reactivated and resting microbial cells), and active biomass (metabolically active cells). The metabolic state of microbial communities in buried and modern background soils was estimated from the proportion of active and total biomasses. The paleosoils were found to be characterized by lower total and active biomasses and a lower proportion of active microorganisms as compared to the modern background soils.

[The establishment of the maximum permissible concentration of orlok in the air of a work area when used in agriculture].

Inhaled Orlok causes changes in the CNS, blood morphology, renal function. The threshold concentration of Orlok is 0.17 mg/m3, its subthreshold concentration is 0.

[Morphology of experimental extrinsic allergic alveolitis caused by dust typical to swine-breeding farms].

Prolonged experiments performed on white rats revealed that inhalation of the dusts of swine-breeding farms caused the development of exogenous allergic alveolitis with the clinical picture of its acute and preacute stages. The characteristics of the immuno-morphologic changes fully depended on the dust concentration levels and the duration of the contact.