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Natrialba magadii bacteria. Coloured scanning electron micrograph (SEM) of a group of the extremophile Natrialba (or Natronobacterium) magadii bacteria. These bacillus (rod-shaped) bacteria live in pools with high salt concentration, and high (alkaline) pH. They can tolerate a pH as high as 11. Due to their particular requirements, they are not pathogenic in humans. Magnification: x2000 at 6x7cm size. (KEYSTONE/SCIENCE PHOTO LIBRARY/EYE OF SCIENCE)