Effect of stimulation of subthalamic nucleus on grooming movements and their rhythmicity in pups and mature rats.

The effect of rhythmic stimulation of subthalamic nucleus on grooming movements and their rhythmicity was studied on mature rats and on 13- and 14-day rat pups. Unilateral monopolar stimulation of subthalamic nucleus was performed on unrestrained animals via implanted electrodes. This stimulation activated virtually all grooming movements (scratching, hair-plucking, licking, and body-shaking); the effect was most pronounced in pups.

[The temporal organization of human fetal motor function].

Fetal motor bursts were recorded in pregnant women at 11-18, 20-24 and 30-32 weeks of pregnancy. It was stated that spontaneous motor activity in human fetus is similar to autogenic periodic motor excitation observed in other species of vertebrates, i.e.

[Graphic registration of grooming behavior and its parameters in rat ontogenesis].

Ontogenic development of grooming behaviour (washing, scratching, lacking, shake down) by using precise graphic recording was studied. For this reason actograph with crystal pickup and electroencephalograph were used. A rhythmic phase of grooming behaviour is formed gradually, reaching the adult level up to the period in 16-17 days.

[An evaluation of the radiation similarity between soft biological tissue and a modified ferrosulfate dosimeter].

On the basis of recent recommendations on soft biotissue composition and data concerning value of specific neutron kerma for a number of element atoms within the energy from thermal one to 29 MeV obtained were the values of electron density, effective atomic number and specific kerma of neutrons for soft biotissue and ferrosulphate dosimeter sensitized by benzoic acid. The data are proposed for practical use in radiobiological experiments.