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Biomedical subjects

M B Vaĭnshteĭn

Publications and source records attributed to M B Vaĭnshteĭn.

9 recordsLinked to original sources
PubMed1989

[Effect of the oxidation-reduction potential of the medium on the production of gentamycin].

The medium redox potential had an effect on gentamicin production by Micromonospora purpurea v. violacea, strain VNIIA 7R. The Eh influence was shown to be statistically reliable when the results were expressed in relative units against the control. In the laboratory experiments with low volumes of the medium the Eh increase by more than 170 per cent induced inhibition of gentamicin biosynthesis while the Eh increase by 108 to 168 per cent induced stimulation of the activity.

Culture Media↗
PubMed1989

[Effect of hyperbaric oxygenation on the corticosterone content of the blood in experimental acute respiratory distress syndrome].

The three series of experiments conducted on 139 adult wistar rats it was found, that two-hour stay of the animals in barochamber under the pressure of 3 atmospheres reduces considerably the percentage of mortality rate and decelerates the development of arterial hypoxemia in rats with an experimental model of acute respiratory distress syndrome (ARDS) reproduced by intrapleural injection of oleic acid (0.27 ml/100 g). Stalle in comparison with the control (I) series elevation of corticosterone in the animal blood II and III series (conduction of HBO correspondingly in 4 and 12 hours from the beginning of the process) is considered as the manifestation of one of the most important mechanism of organism adaptation to the development of acute hypoxia in ARDS.

Acute Disease↗
PubMed1988

[Use of hyperbaric oxygenation to correct an acute experimental respiratory insufficiency syndrome].

The results of the experiments on 159 Wistar rats have shown that one two-hour session of hyperbaric oxygenation (HBO) under the pressure of 3 ata affects considerably the course of acute respiratory insufficiency syndrome: the mortality rate decreases markedly, the development of arterial hypoxemia and structural changes peculiar to the "wet" lung could be averted. The results of the investigations demonstrate the possibility of HBO application for the prophylaxis and treatment of the syndrome.

Acute Disease↗
PubMedDate not supplied

[About nannobacteria].

Bacterial nanocells 0.2-0.3 micron in size and hundreds of a cubic micron in volume have been revealed in natural habitats and obtained in pure cultures. The taxonomic analysis of naturally occurring nanobacteria showed that they belong to the known taxa of the kingdom Eubacteria. The results of the cytological investigation of nanocells suggest that they are universally formed in response to stress impacts.

Adaptation, Biological↗
PubMedDate not supplied

[Characteristics of sulfur bacteria from lakes of the Mari ASSR].

Five karst lakes were investigated in the Mari Autonomous Republic. The vertical distribution of thionic bacteria in water was correlated to the distribution and content of dissolved sulphides. The concentration of thionic bacteria was higher in more productive lakes. A symbiotic culture of thionic and denitrifying bacteria, but not Thiobacillus denitrificans, was isolated from water of these lakes.

Oxygen↗
PubMedDate not supplied

[Corrosion of pipe steel samples and conjugated conversion of sulfur compounds by thiobacteria Halothiobacillus neapolitanus DSM 15147].

The kinetics of conversion of sulfur compounds by Halothiobacillus neapolitanus DSM 15147 bacteria was studied in the presence of steel samples. It was shown that the presence of steel altered the known pathway of sulfur compound oxidation by thiobacteria. Production of atomic hydrogen via the interaction between biogenic sulfuric acid and steel enhanced secondary production of intermediates and decreased the content of sulfate produced previously. The process was accompanied by pH elevation and continuation of intense growth of the thiobacterium culture. Thiobacteria formed a corrosive medium, which caused metal destruction. The protective properties of anticorrosive coatings 225 LS and 640 mk were tested. It was shown that these coatings protected steel from the destructive effect of biogenic sulfuric acid.

Corrosion↗
PubMedDate not supplied

[Thiosulfate as an intermediate product of bacterial sulfate reduction].

Sulfur compounds produced at intermediate stages during transformation of sulfate to sulfide were analyzed in experiments with a culture of sulfate reducing bacteria. Small quantities of thiosulfate can accumulate in the medium at the beginning of growth of the sulfate reducing bacterium. The data are discussed and compared with the results of Chambers and Trudinger (1975) who could not detect thiosulfate in similar experiments.

Culture Media↗