[Effect of chronic exposure to nitrogen dioxide on biogenic amine levels in the brain of guinea pigs].

The experiment was carried out on male guinea pigs exposed to NO2 at a constant concentration of 0.1 ppm 24 h daily for 1, 2.5 and 6 months, or NO2 concentration was increased to 0.

Hypotensive action of prolactin in rats with spontaneous hypertension.

Rats (SHR) weighing 240 +/- 10 g with spontaneous hypertension were given intraperitoneally porcine prolactin in doses from 0.2 to 2000 micrograms/kg of body weight. The systolic pressure was measured before hormone administration and 2 hours after it.

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.