[Impulse activity of visual cortex neurons at successive stages of instrumental behavior].

Dynamics of spike activity of 62 units was studied in the projection visual area of the cerebral cortex in unrestrained cats during their performance of a conditioned alimentary instrumental reaction. Analysis of the activity of each unit was made at intervals from the beginning of the conditioned signal (light or sound) to the beginning of lapping milk which appeared in the feeding trough after the cat pressed the pedal. It has been found that the form of activity of the cortical unit greatly depends on the modality of the conditioned stimulus (light or sound).

Photoinduction kinetics of electrical potential in a single chloroplast as studied with micro-electrode technique.

1. Using single chloroplasts of Peperomia metallica the kinetics of light-induced potential changes were studied. Three kinetic components (the initial fast rise, the decay in the light and the decay in the dark) were found to be characterized by time constants 4, 220 and 60 ms, respectively at light intensity 5000 1x and temperature 18 degrees C.

[Study of the ultrastructural and functional expression of the hepatocyte genome under conditions of prolonged depression of protein biosynthesis by cycloheximide. III].

Dynamics of changes in mtRNA synthesis and mitochondria ultrastructure is strictly dependent on the level of inhibition of biosynthesis of cytoplasm proteins and "soluble" proteins of mitochondria by cycloheximide in hepatocytes: 1-6 hrs later a progressive weakening of protein synthesis is accompanied by a drop in mtRNA synthesis and essential destruction of mitochondria; from 12 to 24 hrs a partial restoration of protein biosynthesis induces the processes of the above-mentioned indexes normalization.

[Ultrastructural and functional expression of the hepatocyte genome in conditions of prolonged inhibition of protein biosynthesis with cycloheximide. II].

The correlation of changes in sedimentary properties of polysome preparation and ultrastructure of the rough endoplasmatic reticulum in the rat liver cells was found in dynamics of the protein biosynthesis inhibition by cycloheximide (CH1). In particular, 6 hrs after CHI introduction the greatest fragmentation of the reticulum is accompanied by the greatest destruction of polysomes; however at the end of the 24-hour period a tendency is observed to restore the studied components of the protein synthesis system.