[The meaning of the concept "ecological hazard"].

Anthropogenic activity transforms the natural media and in the wide sense is a stimulus of further evolution. The late consequences of anthropogenic activity are mainly unpredictable. It is possible to acknowledge anthropogenic activity as ecologically hazardous only when it has a damaging effect on the health of man or interferes with its interests, i.

[Changes in the cellular reactivity of guinea pigs sensitized with Bacillus thuringiensis].

Changes in the cell-mediated responsiveness of the body under the action of different variants of B. thuringiensis have been studied in experiments on guinea pigs. The data thus obtained indicate that the development of sensitization occurs in the animals, which is manifested by the increase of the sensitivity of leukocytes to the specific allergen and by the increase of the phagocytic activity of peritoneal macrophages.