STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Bacillus megaterium bacteria, coloured scanning electron micrograph (SEM). This rod-shaped Gram positive bacteria is found in soil. It is one of the biggest bacterial cells, measuring up to four micrometres in length. Because of this it is a popular organism for bacterial research. Magnification: x2000 when printed at 10 centimetres wide.
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