Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 5, Issue 4, Pages 321-326Publisher
WILEY-BLACKWELL
DOI: 10.1046/j.1462-2920.2003.00419.x
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We report the isolation and properties of several species of bacteria from Siberian permafrost. Half of the isolates were spore-forming bacteria unable to grow or metabolize at subzero temperatures. Other Gram-positive isolates metabolized, but never exhibited any growth at - 10degreesC. One Gram-negative isolate metabolized and grew at - 10degreesC, with a measured doubling time of 39 days. Metabolic studies of several isolates suggested that as temperature decreased below + 4degreesC, the partitioning of energy changes with much more energy being used for cell maintenance as the temperature decreases. In addition, cells grown at - 10degreesC exhibited major morphological changes at the ultrastructural level.
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