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Growth of the facultative anaerobes from Antarctica, Alaska, and Patagonia at low temperatures
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Paper Abstract

Psychrotolerance, as an adaptation for surviving in extreme environments, is widespread among mesophilic microorganisms. Physico-chemical factors such as pressure, red-ox potential, pH and salinity could significantly alter the features of ecosystems by providing liquid water at subzero temperatures. Furthermore, organisms can respond to temperature changes by several known mechanisms, including changing the conformation capacities of constitutional proteins or by the synthesis of mucopolysaccharides around the cell wall and membrane. Such protective mechanisms make it possible for cells to not only passively survive low temperatures in a state of anabiosis, but also to be capable of actively metabolizing substrates and reproducing normally. The physiological and biochemical characteristics of the species, as well as genetics, could be remarkably changed due to adaptation and surviving in extreme environments. The cold shock genes of some of the studied strains of psychrotolerant facultative anaerobes were reported previously. In this paper we present experimental data for psychrotolerant, non spore-forming, facultative anaerobes isolated from geographically different cold regions of our planet. We show the growth response on changing from anaerobic conditions to aerobic with cultivation at low temperatures.

Paper Details

Date Published: 1 November 2004
PDF: 11 pages
Proc. SPIE 5555, Instruments, Methods, and Missions for Astrobiology VIII, (1 November 2004); doi: 10.1117/12.564382
Show Author Affiliations
Elena V. Pikuta, NASA National Space Science and Technology Ctr. (United States)
Richard B. Hoover, NASA National Space Science and Technology Ctr. (United States)

Published in SPIE Proceedings Vol. 5555:
Instruments, Methods, and Missions for Astrobiology VIII
Richard B. Hoover; Gilbert V. Levin; Alexei Y. Rozanov, Editor(s)

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