Introduction and Definitions
The limits of life on this planet have been the subject of many studies. One of the interesting results of these studies was the phenomenon that water availability and water activity under conditions extremely deviating from the average surface conditions on the Earth are key factors for the establishment and success of very special ecosystems. We understand today that extremely cold, extremely hot and extremely saline environments are similar in this respect. The mere fact that glycerol is used in the preservation of bacterial strains in deep-frozen state and at the same time is one of the many compounds produced for adaptation to hypersaline conditions demonstrates this relationship.
KeywordsDust Sulfide Petroleum Uranium Photosynthesis
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