Ultrastructural characteristics of the cerebral capillaries of aging animals subjected to hypoxic hypoxia

The ultrastructure of capillary walls of the mamillary bodies was studied in rats distributed in two age groups: adult (6-8-month-old) and old (28-30-month-old) animals under hypoxic hypoxia. It was found that age-related differences in the response of brain capillary walls to the injuring agent were reduced to a rapid increase in dystrophic phenomena and less conspicuous compensatory processes seen in the old animals. More profound injuries to other brain tissues adjacent to the vessels were also indicative of less efficacy of the adaptive reactions in the old animals.     

Radiation resistance of animals subjected to lethal irradiation with chemical protection

The data are presented on radioresistance of mice 1, 5 and 9 months after irradiation (LD95-99/30) in conditions of protection with cystamine. It was shown that the resistance of these animals to repeated irradiation with LD50/30 is considerably lower than that of the animals not exposed previously. The radioresistance and such indices of the haemopoietic system status as quantity of caryocytes and colony-forming capacity of the bone marrow are compared.     

Morphological characteristics of testicular tissue in animals subjected to unilateral laser castration

In this paper, results of the morphological studies of mammalian testicular tissue after exposure of one of the testes to powerful laser radiation are reported. The results obtained are compared with those reported in the literature on the biological effect of penetrating radiation. No negative influence of powerful laser radiation is registered at the organism level. The criteria for estimation are the tissue response, morphological picture of spermatogenesis, and reproductive functions of exposed animals and of their progeny.