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Characterization of Culturable Thermophilic Actinobacteria from Livingston Island, Antarctica

Author Affiliations

  • 1Department of Applied Microbiology, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 26, 1113 Sofia, BULGARIA

Int. Res. J. Biological Sci., Volume 3, Issue (3), Pages 30-36, March,10 (2014)


Thermophilic microorganisms in Antarctica are poorly investigated. This paper reports partial characterization and biosynthetic abilities of 26 thermophilic actinobacteria isolated from soil and penguin excrements samples from Livingston Island, Antarctica. About 15% of the tested Antarctic actinobacteria were able to tolerate up to 4% NaCl in the growth medium. We found that all strains are sensitive to eight, and 77% to ten of the 12 tested antibiotics suggesting relatively low anthropogenic impact in this Antarctic region. The Antarctic actinobacteria were tested for hydrolytic enzymes activity, antibiotic and hemolytic activity. It was found that all strains were able to hydrolyze starch, 81% - tributirin, and 65% - casein. All Antarctic actinobacteria demonstrated hemolytic activity, and about 27% - antimicrobial activityagainst some common bacterial pathogens. The results obtained revealed promising strains producers of industrially important thermostable enzymes and antibiotic compounds.


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