[Infant mortality in Leningrad Region].

Presented in the paper is the level and dynamic figures (for a period of 15 years) of infant mortality, i.e. one of the most important indices of population health and of quality of medical care, including all its components, as well as of perinatal mortality as observed in Leningrad Region.

[Rate of local cerebral blood flow in newborn rats in normo- and hypercapnia].

Local cerebral blood flow (1CBF) measured by hydrogen saturation technique, and cerebral blood volume (CBV) observed by photoplethysmographic method were investigated in unanesthetized newborn rats. 1CBF in newborn animals was found to be much lower than in the adult ones. In contrast to adult animals, CO2 inhalation in newborn rats failed to increase 1CBF.

Some characteristics of human lymphocyte responsibility to stimulation in vitro.

Attempts were made to examine the input of some ecological and physiological factors into the fluctuation of the lymphocyte transformation assay results. The spontaneous and PHA-induced 3H-thymidine uptake in lymphocyte cultures of adult healthy persons and healthy or rheumatic fever children fluctuated at different seasons of the year with the maximum at summer. The activity of cultured women's lymphocytes depended on the phases of menstrual cycle of donors.

[Cerebrovascular response in newborns].

It was shown by the plethysmographic method that, in contrast to adult animals, in the newborn rats the blood vessels of the cerebral hemispheres and of diencephalon while displaying a distinct response to oxygen, failed to react to carbon dioxide, the latter being attributed to the low carbonic anhydrase activity in the tissues of these portions of the brain.