POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Bacteria on a pin. Coloured scanning electron micrograph (SEM) of bacteria (orange) on the tip of a pin. Although considered sharp and smooth on a human scale, it can be seen that the surface of the pin is rough and the tip is blunt on the scale of a bacterium. Magnification: x1600 when printed 10cm high. In terms of microns (thousandths of a millimetre), the tip of the pin is some 30 microns across, and the bacteria are about 5 microns long.
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