Polyamine levels in sarcoma-bearing rats in relation to growth and necrosis of the tumour cells.

Putrescine (PU), spermidine (SPD) and spermine (SPM) levels in blood serum of MC Sa 1828 P-bearing rats have been studied in relation to tumour weight and the histological picture. A statistically significant increase of PU and SPD was found in the course of tumour development. Decrease in the level of polyamines in the necrosis stage was also found.

[Monoamine oxidase (MAO) activity in the liver and brain of guinea pigs exposed to an electric field of industrial frequency].

The activity of MAO has been determined in the brain and liver of 36 male guinea-pigs. The animals have been exposed to electric fields of 50 Hz and 100 kV/m frequency. The guinea-pigs have been divided into the following groups (12 animals each): group I--every day 4 hrs' exposure to electric fields (total dose--100 hours), group II--4 hrs' exposure every other day (total dose--100 hours), group III--4 hrs' exposure every third day (total dose--100 hours).

[Treatment of diabetes by implantation of isolated islands of Langerhans in semipermeable chambers].

The biological tolerance of chambers with membranes of regenerated cellulose and the influence of the implantation of isolated islets of Langerhans in these chambers on the blood sugar level of rats with experimental diabetes was investigated. It was concluded that retroperitoneal space offers the best conditions for the implantation of such chambers. The technique of implantation and the preparation of the chambers are the critical factors for the degree of foreign body reaction.

[Functional estimation of the isolated islands of Langerhans in semipermeable membrane chambers].

The possibility for the use of membranes of regenerated cellulose was tested for constructing semipermeable chambers for the cultivation and implantation of the isolated islets of Langerhans. The membranes of regenerated cellulose was well-permeable for insulin. An implantation for one month had no influence at the rate of diffusion of insulin.

Studies on the influence of combustion exhaust gases and the products of their reaction with ammonia on the living organism. II. The influence on aspartate aminotransferase (AspAT) and alanine aminotransferase (AiAt) activities in the liver of guinea pig.

The behaviour of aspartate aminotransferase (AspAT) an alanine aminotransferase (AIAT) in the whole homogenate and subcellular liver fractions of guinea pigs exposed to combustion exhaust gases and the neutralization products of these gases is presented in this paper. In the liver of animals exposed to the chronic action of combustion exhaust gases a decrease of both enzyme activities in the whole homogenate as well as in the subcellular fractions could be noted. Statistically significant changes are shown by AspAT.

Studies on the influence of combustion exhaust gases and the products of their reaction with ammonia on the living organism. I. The influence on DNA, RNA and soluble proteins in the liver of guinea pig.

The paper presents the behaviour of DNA, RNA and soluble proteins in whole homogenate as well as the nuclear, mitochondrial and postmitochondrial liver fractions in guinea pigs exposed to combustion exhaust gases and the products of their reaction with ammonia. A decrease of RNA level was found in the liver of animals exposed to combustion exhaust gases together with a decrease of soluble proteins in all the studied fractions. On the other hand, in the group of animals subjected to the action of neutralization products of combustion gases by ammonia, the studied components were increased.

Aspartate carbamoyltransferase activity in rat liver at different stages of its development.

Aspartate carbamoyltransferase (ACTase) activity has been measured in rat livers at different stages of their development and in intact and regenerating livers. The level of enzyme activity was found to be the highest in the earliest fetal livers (about 7 times higher than in the adult rat liver). Deproteinized by heating, supernatants of sheep liver homogenates were purified on a Sephadex G-25 column.