[Ultrastructural study of TNT effect on the callus cells and the cells of intact plants of Yucca gloriosa L].

Intracellular distribution of assimilated 2,4,6-trinitrotoluene (TNT) in callus cells, flower buds and leaves of intact Yucca gloriosa L. plants using electron microscope radioautography. The radiotracer was detected in vacuoles, plastids, mitochondrion, endoplasmic reticulum and cytoplasm.

Effects of partial intraspecies deprivation of rats on short-term image memory.

An individual's zoosocial experience plays a significant role in the formation of adaptive behavior in animals. Published data show that significant restriction of intraspecies interactions induces impairments of higher nervous activity, including such functions as learning, memory, and the control of emotions. These changes are particularly marked when deprivation of zoosocial interactions occurs in the early stage of the animal's postnatal development.

[Influence of partial intraspecies deprivation on short-term image-driven memory in rats].

Behavior and short-term memory function were studied in adult rats risen under conditions of partial intraspecies social deprivation. Testing of delayed responses (and emotional state) showed that the partial deprivation of intraspecies communication at the early stage of postnatal ontogeny led not only to disorders of short-term memory in the adult rats, but also to behavioral alterations, which may be due to impaired development of the regulatory mechanisms of motivation and emotions.

Tissue and subcellular localization of oligofurostanosides and their specific degrading beta-glucosidase in Dioscorea caucasica Lipsky.

The application of the histochemical technique using the Ehrlich reagent showed that the oligofurostanosides--the steroid glycosides of the furostan series--are localized in idioblasts (special cells--receptacles) of the epidermal layer of Dioscorea caucasica leaves. The activity of oligofurostanoside-specific beta-glucosidase was localized mainly in the membrane fraction of the thylakoides and was also found in the Dioscorea caucasica leaves. We have suggested, that the differential tissue, the subcellular localization of the oligofurostanosides and their degrading enzymes provide the maintenance of the furostanol structure of steroid glycosides which is necessary for their transport within the leaf and from the leaf to the rhizome.

[Characteristics of the formation of short-term memory in rats at various time intervals between tests].

Dependency of the speed of short-term memory formation in rats on the intertrial interval was studied. The so called direct method was applied for determining the delay time of the complex perception of food location. Conclusion is made that not less than 2 minutes intertrial intervals appear to be optimal for the formation of short-term memory.