DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) of Geobacillus stearothermophilus (formerly known as Bacillus stearothermophilus), Gram-positive, rod spore-forming prokaryote This bacterium grows at warm temperatures and is considered a thermophile. It is among the most abundant in warm compost piles. Spores of bacteria allow the bacteria to survive harsh conditions until the time when the bacterium can grow and reproduce. It is used as a biological indicator, including monitoring sterilization processes. Magnification: x2,000 when shortest axis printed at 25 millimetres.
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