E Iu Chirkova

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The experiments with unconscious cats and dogs have demonstrated that the calcium antagonist nimodipine has a profound anti-ischemic property. The drug reduces the average value of ST-segment elevation in multiple epicardial ECG leads, during acute myocardial ischemia. Nimodipine maintains cardiac pump and contractile functions, elevates ATP levels in the(More)
The experiments on different species of animals (mice, cats) showed the lack of parallelism between the antihypoxic and anti-ischemic effects of pharmacological agents. Of four studied antihypoxic agents (lithium oxybutyrate, piracetam, glyo-6, a derivative of pyrimidine S-207) only GABA derivatives showed an increase of the lactate/pyruvate ratio in the(More)
Accumulation of DNA-protein crosslinks during "stationary phase ageing" (i.e. with the increase of non-proliferating period) of cultured transformed Chinese hamster cells and normal embryonic diploid human fibroblasts was determined by the improved method of column chromatography using hydroxylapatite of 14C-valine, 14C-leucine and 3H-thymidine-labelled(More)
The effect of vasocyclin (prostacyclin) on the blood supply, activity and functional state of the intact and ischemic myocardium was studied in experiments on anesthetized cats. The drug (100, 300 and 500 mg/kg/min) was shown to produce a dose-dependent increase of the coronary blood flow, systolic and cardiac outputs, an enhancement of the myocardial(More)
On the basis of the Verhulst-Pearl equation, a model of cultured cell growth kinetics is devised. Analysing both authors' and literature data, a possibility was shown to use the model for description of growth kinetics of different cultured cell types. The proposed method of analysis of cell growth kinetic characteristics also provides a rapid evaluation of(More)
"Stationary phase ageing" of cultured Chinese hamster cells (when proliferation rate decreases and in the stationary growth phase) produces an increase in the frequency of spontaneous sister chromatid exchanges (SCE). Thiophosphamide-induced (24 h) frequency of SCE increases from 2-day to 5-day "age" and later (in the stationary phase) is practically the(More)
With the help of the earlier devised model of cultured cell growth kinetics it is shown that the "plateau" level on the growth curve of Chinese hamster cells decreased proportionally to a dose of the agent applied after a short-term treatment by gamma-radiation or by alkylating agent thiophosphamide. The analysis of our own and literature data enabled us to(More)
During "stationary phase ageing" of cultured Chinese hamster cells (B11dii-FAF28 line, 2372a clone), i. e. while decreasing the proliferation rate and in the stationary growth phase the frequency of spontaneous sister chromatid exchanges (SCE) progressively increases (from 2- to 23-day "age"); the frequency of thiophosphamide-induced (1h) SCE increases from(More)