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How does the discovery of “extremophiles” change our understanding of the tree of life?
Member rating: No Rating | Words: | Submitted: Thu Jul 11 2002
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How does the discovery of "extremophiles" change our understanding of the tree of life? Extremophiles have been known about for many years, since the 1950s; at this point in time they were not well understood - scientists have now recognised that places once assumed to be sterile abound with microbial life1. The first classification system was put forward by Carolus Linnaeus (1707-1178); other 'designs' were introduced over the years, until 1937 when the French marine biologist Edouard Chatton suggested the term 'procaryotique' and 'eucaryotique' to distinguish animal and plants cells from those of the bacteria2. From this the 'Five Kingdom' theory was proposed, and it 'worked' for many years - for the most part, all organisms discovered could be categorised within the 'Five Kingdoms'. It was Carl Woese who led the research regarding extremophiles, some 20 years ago, using the technique oligonucleotide cataloging. This technique consisted of breaking a rRNA molecule...
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