Interaction of oxygen with the X-rayed tissues, chemical substances and elements is one of the main mechanism of radioactive damage. Radiosensibilization by oxygen (oxygen effect) is most highly exhibited under the action of high and moderate radiation doses. However there is only scanty investigations and information about oxygen-dependent processes under low doses of internal and external radiation due to their intricate character.
View Article and Find Full Text PDFUkr Biokhim Zh (1978)
November 1992
The 24-hour's changes in ATP content in the gastrocnemiuses of intact rast are not significant. Both the ADP and AMP content is subjected to 24-hour's variations. It reaches its maximum within the time period from 12 to 15 o'clock p.
View Article and Find Full Text PDFFiziol Zh (1978)
August 1992
The effect of a single intraperitoneal administration of corticotropin (1 unit) and hydrocortisone (5 mg) per 100 g of a body weight on the membrane potential (MP) as well as on the response rate of miniature end plate potentials (RRMEPP) of musculus soleus fibres of various polarization levels has been investigated in rats. It is shown that administration of corticotropin does not change the MP value, while that of hydrocortisone elicits its increase at the low initial polarization level of the muscle fibre membrane and its decrease at the high level. Hydrocortisone administration does not change the MP value at normal levels of fibre polarization.
View Article and Find Full Text PDFWe have compared the embryotoxic effect of aliphatic alcohols on antenatal embryogenesis of rats and the activity of alcohol dehydrogenase (EC.1.1.
View Article and Find Full Text PDFUkr Biokhim Zh (1978)
January 1990
The 7 day-long intragastric administration of ethanol and ethyleneglycol in a dose of 1/3 DL50 was studied for its effect on the circadian variations of the aspartate aminotransferase activity (AST, EC 2.6, 1.1) in the liver, brain, myocardium and kidney of male rats.
View Article and Find Full Text PDFUkr Biokhim Zh (1978)
August 1988
The intraperitoneal administration of corticotropin (ACTH) in the rate of 1 and 2 units per 100 g of body weight and that of hydrocortisone in the rate of 1 mg and 5 mg per 100 g body weight were studied for their effects on carbohydrate metabolism rate in musculus gastrocnemius as well as on the level of 11-oxycorticosteroids in blood plasma of rats. The glycogen level in muscles was found to rise 3 hours after ACTH and hydrocortisone administration and it correlated with the hydrocortisone level increase in blood plasma (r = 0.714 and 0.
View Article and Find Full Text PDFThe effect of corticotropin (ACTH1-39), synacthen (ACTH1-24) and hydrocortisone-hemisuccinate on the activity of Ca-ATPase of skeletal muscle sarcoplasmic reticulum (SR) and calcium (Ca) accumulation in SR vesicles has been studied. It has been shown that ACTH1-39 (I U per 100 g body weight) increased the activity of Ca-ATPase in skeletal muscle SR of rats, while hydrocortisone (5 mg per 100 g body weight) did not change the activity of Ca-ATPase in skeletal muscle SR. However, both hormones increase the total activity of ATPase.
View Article and Find Full Text PDFA method is suggested for determining the activity of pyruvate kinase (ATP: pyruvate-phosphotransferase). The method is based on evaluation of the amount of ATP formed in the course of phosphoenolpyruvic-to-pyruvic acid transformation in the presence of ADP and magnesium ions. The ATP amount in the reaction medium is determined by paper electrophoresis with subsequent spectrophotometry.
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