Abstract
Two extremely thermophilic archaea, designated W-12 and P-4, were isolated from a geothermal vent in the tidal zone of Whale Island, New Zealand, and from geothermally heated bottom deposits of the Bay of Plenty, New Zealand, respectively. Cells of isolate W-12 are irregular cocci, 0.3-1.2 microns in diameter, motile with polar flagella. The cell envelope consists of one layer of subunits with a major protein of M(r) 75,000. Cells produce protrusions of different kinds: prostheca-like, chains of bubbles, or network of fimbriae. Cells of isolate P-4 are regular cocci, 0.7-1.0 micron in diameter, motile with polar flagella. The cell envelope consists of two layers of subunits; its major protein has an M(r) of 56,000. Both organisms are obligate anaerobes, fermenting peptides in the case of strain W-12, or peptides and starch in the case of P-4. Elemental sulfur is required for growth and is reduced to hydrogen sulfide. The optimal growth temperature of the new isolates is in the range 80-88 degrees C. The optimal growth pH is 6.5-7.2. The G + C content of the DNA of strain W-12 is 50.6 mol%, and of strain P-4 is 53.3 mol%. Based on physiological characteristics, 165 rDNA sequence comparison and DNA base composition, the new isola...Continue Reading
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