Zorigto B. Namsaraev

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We have studied the activity and composition of several geochemically significant physiological groups of bacteria in more than twenty alkaline salt lakes of the north-east Mongolia steppe with water salinity from 3 to 390 g l−1 and pH values ranging from 9.0 to 10.6. Active and diverse microbial communities have been found in most of the lakes. The(More)
A novel, obligately anaerobic, alkalithermophilic, chemo-organotrophic bacterium was isolated from the sediment of an alkaline hot spring located on Paoha Island in Mono Lake, California, USA. This rod-shaped bacterium was motile via peritrichous flagella. Isolated strains grew optimally in 5-25 g NaCl l(-1), at pH 9.0-9.5 and at a temperature of 58 degrees(More)
The structure and production characteristics of microbial communities from the Urinskii alkaline hot spring (Buryat Republic, Russia) have been investigated. A distinctive characteristic of this hot spring is the lack of sulfide in the issuing water. The water temperature near the spring vents ranged from 69 to 38.5°C and pH values ranged from 8.8 to 9.2.(More)
Cyanobacteria inhabit the Antarctic continent and have even been observed in the most southerly ice-free areas of Antarctica (86–878 S). The highest molecular diversity of cyanobacterial communities was found in the areas located between 708 S and 808 S. Further south and further north from this zone, the diversity abruptly decreased. Seventy-nine per cent(More)
A Gram reaction positive, spore-forming, facultative anaerobic bacterium belonging to the Phylum Firmicutes, was isolated from alkaline hot (80°C, pH 9.8) spring Tsenher, Central Mongolia. The cells were rod shaped, feebly motile, peritrichously flagellated. Strain T4T was moderately thermophilic with optimum growth at 60°C. Maximum temperature for growth(More)
Microbial communities growing in the bed of the alkaline, sulfide hot spring Bol'sherechenskii (the Baikal rift area) were studied over many years (1986–2001). The effluent water temperature ranged from 72 to 74°C, pH was from 9.25 to 9.8, and sulfide content was from 12 to 13.4 mg/ml. Simultaneous effects of several extreme factors restrict the spread of(More)
Two strains of alkaliphilic thermophile bacteria of the genus Anoxybacillus from hydrothermal vents of Lake Baikal were detected and characterized. It was demonstrated that proteinases secreted by these bacteria had wide substrate specificity, hydrolyzed proteins and n-nitroanilide substrates, and showed maximal activity at(More)
We studied the distribution of anoxygenic phototrophs in 23 steppe lakes in the Transbaikal region (Russia), in Uzbekistan (Central Asia) and in the Crimean peninsula (Ukraine). The lakes varied in their mineral content and composition (salinities from 0.2 to 300 g L(-1) ). The Transbaikal lakes were alkaline (pH>9), with high amounts of soda. The Uzbek and(More)
Considerable amount of publications describes various techniques to extract pigments and to calculate the pigment concentration [1, 2]. In general, the procedure is as follows: (1) a sample of a known volume (in case of water or liquid culture samples) or area (bacterial mats and fouling) is collected; (2) the sample is concentrated on a filter,(More)
Lacustrine microbial mats in Antarctic ice-free oases are considered modern analogues of early microbial ecosystems as their primary production is generally dominated by cyanobacteria, the heterotrophic food chain typically truncated due to extreme environmental conditions, and they are geographically isolated. To better understand early fossilization and(More)