LEE D. SIMON / SCIENCE PHOTO LIBRARY LEE D. SIMON / SCIENCE PHOTO LIBRARY
Bacterial cell dividing. False-colour transmission electron micrograph (TEM) of a single Bacillus licheniformis bacterium undergoing cell division. This rod-shaped bacterium is in a late phase of replication. The cell wall (at centre) separating the two new sister cells has almost completely formed. Bacteria do not contain a nucleus, and the DNA genetic material is seen scattered (blue) inside each developing cell. Other bacteria in this image appear rounded as they have been sectioned across instead of lengthwise. Bacillus licheniformis is not pathogenic to humans and may be isolated from soil samples. Magnification: x14,500 at 35mm size.
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