MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Bacillus stearothermophilus. Coloured Scanning Electron Micrograph (SEM) of a cluster of bacteria Bacillus stearothermophilus on wheat straw. These rod-shaped bacilli are thermophilic, requiring a high temperature to survive. Their optimum temperature for growth is 55-75 degrees Celsius (they remain alive at 90 degrees Celsius). Bacillus stearothermophilus lives in dung and manure, and is specially bred for biological sewage works. Magnification: x2,250 at 35mm size.
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