Ludmila P. Kozyreva

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Growth parameters (temperature and pH) were determined for collection cultures of aerobic heterotrophic bacteria. Analysis of the experimental data with the use of the Rosso model made it possible to calculate the extreme values of temperature and pH permissive for culture growth. The cultures examined were subdivided into three groups with respect to their(More)
The activity of methanogenic and methanotrophic bacteria was evaluated in bottom sediments of Lake Baikal. Methane concentration in Baikal bottom sediments varied from 0.0053 to 81.7 ml/dm3. Bacterial methane was produced at rates of 0.0004–534.7 μl CH4/(dm3 day) and oxidized at rates of 0.005–1180 μl CH4/(dm3 day). Peak methane production and oxidation(More)
Influence of nitrogen source on proteinases synthesis in aerobic alkalotolerant and halotolerant bacteria from soda-salt lakes of Transbaikalia was studied. Maximal accumulation of proteinases was revealed on medium with peptones. Introduction of various sources of nitrogen in the medium did not result in increase of enzyme activity in cultural liquid. It(More)
The structural features of a cyanobacterial mat from Lake Khilganta (Southeastern Transbaikal Region) developing at different values of salinity and pH were determined based on our long-term investigation of the natural community, as well as results obtained during experimentation with its laboratory analogue. At water mineralization of 40–50 g/l,(More)
The activity of methanogenic and methanotrophic bacteria was evaluated in bottom sediments of Lake Baikal. Methane concentration in Baikal bottom sediments varied from 0.0053 to 81.7 ml/dm3. Bacterial methane was produced at rates of 0.0004-534.7 microliters CH4/(dm3 day) and oxidized at rates of 0.005-1180 microliters CH4/(dm3 day). Peak methane production(More)
The diversity of the microbial community from the sandy mat of the soda lake Zun-Torey (Transbaikalia) has been studied using enrichment cultures. The use of classical microbiological and molecular genetic techniques allows one to assess the numbers and diversity of species of decomposer bacteria from the cellulolytic communities formed in different(More)
It is established that the microbial community of the bacteria-destructors in bottom sediments and crust of the soda Lake Khilganta is able to develop in a wide range of pH and mineralization. The community of bacteria-destructors functions most actively in neutral or weakly alkaline conditions and at low salt concentration. The simultaneous action of two(More)
A novel haloalkaliphilic sulfate-reducing bacterium, designated Al915-01T, was isolated from benthic sediments of the Lake Alginskoe, a soda lake located in the Trans-Baikal Region, Russia. Cells of the strain were Gram-stain negative, motile, non-spore-forming vibrion (0.4–0.5 × 1.2–2.3 µm). Strain Al915-01T grew in the pH range from 8.0 to 10.5 (optimum(More)
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