Samara Journal of ScienceSamara Journal of Science2309-43702782-3016Samara State University of Social Sciences and Education2223110.17816/snv20152108Research ArticleTHERMOPHILIC ORGANOTROPHIC BACTERIA OF THE GENUS <i>MEIOTHERMUS</i> IN ALKALINE HYDROTHERMS OF PRIBAIKALYE (BURYATIA)BudagaevaValentina Grygoryevna<p>graduate student at Laboratory of Microbiology</p>valmpa@mail.ruBarkhutovaDarima Dondokovna<p>Candidate of Biological Sciences</p>darima_bar@mail.ruInstitute of General and Experimental BiologyInstitute of General and Experimental Biology, SB, RAS1506201542303210032020Copyright © 2015, Budagaeva V.G., Barkhutova D.D.2015<p>Aerobic, facultative anaerobic hydrolytic bacteria are widespread in the sediments and microbial mats of alkaline hot springs in Baikal region (Buryatia). Typical representatives of hydrolytic bacteria are alkalotermophylic bacilli which are capable of utilizing organic matter in alkaline hot spring waters. Two pure cultures of bacteria growing on acetate, pyruvate and soetone were isolated from the microbial mat of Baikal region thermal springs (Buryatia). These strains were non-sporeforming straight or curved rods that morphologically similar to the representatives of the genus Meiothermus. Bacteria on agar medium formed small smooth pink colonies. Ecophysiological properties of isolates are studied (with respect to temperature and pH). Optimal growth temperature of culture Um-14-2-1 was 450C, the temperature range was 35-600C. The temperature range of strain Al-14-3 was 30-60C, with an optimum 50 C. The pH range of strain Um-14-2-1 is 6.5 to 9.5, the optimum of 8.0. The pH range of strain Al-14-3 is 6.5 to 9.5, the optimum of 8.5. 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