Thermal analysis of whole bacterial cells exposed to potassium permanganate using differential scanning calorimetry: a biphasic dose-dependent response to stress.

The DSC technique applied to the study of the toxic impact of permanganate on bacterial cell culture detected the lack of linearity in the dose-response effect. The results were confirmed by the traditional assay of colony forming ability. The changed pattern of thermal spectra of A.

The peculiarities of water crystallization and ice melting processes in the roots of one-year plants (Plantago major L.).

Results are presented of a water phase transition study in plantain (Plantago major L.) roots, which were used as a model system to research the peculiarities of water crystallization and ice melting processes in complex heterogeneous biological systems. It was confirmed that water in such systems is crystallized in two clearly distinguished temperature ranges: -10 to -25 degree capital ES, Cyrillic and -25 to -45 degree capital ES, Cyrillic.

New calorimetric system and some results of water phase transition research in plant roots.

The principle of operation and main parameters of the recently created scanning differential reverse microcalorimeter of the new generation are presented. The microcalorimeter is destined for studying water crystallization and ice melting processes in heterogeneous systems, including plant and animal cells and tissues in the temperature range of 20 to -55 degrees C. In order to obtain maximum information from the experimental results respective algorithms and applied software package were developed.

[Genetic burden of psychosomatic diseases and exogenous risk-factors of cardiovascular diseases in healthy students with different physiological and psychological adaptation abilities].

Exogenous risk factors of cardiovascular diseases and genetic burden of psychosomatic pathologies have been studied in practically healthy students with various physiological and psychological adaptation abilities for differential analysis of the risk for development of cardiological diseases. The complex of genetic burden of psychosomatic pathologies and exogenous risk factors was significantly more frequent in practically healthy students with strong profile of adaptation mechanisms, increased circadian profile, zero type and weak persistence of fixated set.

Effect of chromium(VI) action on Arthrobacter oxydans.

Arthrobacter species is of interest because of its high potential for bioremediation. Bacteria can detoxify chromium, by either reduction or accumulation inside the bacteria and/or absorption of chromium(VI) (CrVI) on their surface, and efflux pump. The possible pathway of Cr(VI) reduction by Arthrobacter oxydans isolated from Columbia basalt rocks at a US DOE highly contaminated site (USA) has been considered in the present study.

A calorimetric characterization of Cr(VI)-reducing Arthrobacter oxydans at different phases of the cell growth cycle.

This is the first of a series of calorimetric studies designed to characterize and understand survival mechanisms of metal-reducing bacteria isolated from metal-polluted environments. In this paper we introduce a new concept of thermal spectrum of the endothermic melting of complex biological systems (e.g.

[Features of the process of chromatin denaturation in leukemic tissue and murine spleen cells].

It was shown by the method of differential scanning microcalorimetry that an additional peak, at about 57 degrees C appears on heat absorption curves of the whole spleen tissue and cells of BalB/c mouse injected with Rausher virus. It is supposed that this peak is due to the melting of AT-rich regions of internucleosomal DNA in chromatin fibers of tumor cells, which results from the partial loss of proteins or the modification of H1 histone.

[Possibility of using WHO questionnaires, distributed by mail, for detecting stenocardia during mass screening].

In the non-organized population of males and females aged 30 to 50 years who live on the territory served by a Tbilisi district polyclinic, the authors have examined the possibilities of applying the WHO questionnaire sent by mail to the detection of angina pectoris, to the establishment of prevalence of arterial hypertension and smoking and the people's awareness of the presence of coronary heart disease. It has been shown that the questionnaire may assist the physician in detecting patients with exercise-associated angina, establishing the priorities of inviting patients for screening to the polyclinic, forming a follow-up group. The high prevalence of arterial hypertension was found among males (24.

[Process of water crystallization in plant tissues].

Results of microcalorimetric studies of water crystallization in some plant tissues are presented. It was shown that in each tissue water is crystallized in a specific temperature region and the process is independent of water crystallization in other tissues. Besides this water fraction, there exists another one in the tissues which is united in a single system.