PENN STATE UNIVERSITY / SCIENCE PHOTO LIBRARY PENN STATE UNIVERSITY / SCIENCE PHOTO LIBRARY
Ultra-small extremophile bacteria. Coloured scanning electron micrograph (SEM) of Chryseobacterium greenlandensis. This bacteria was retrieved from a 120,000 year old ice core 3000 metres beneath a glacier in Greenland. The species is classified as an ultra-small bacterium as it is approximately 100 times smaller than E. coli. It is also an extremophile as it can survive sub-zero temperatures, high pressure, low oxygen and a nutrient-poor habitat.
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