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Spirochaetes, SEM

Spirochaetes, SEM

C029/6061

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Credit

STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY

Caption

Coloured scanning electron micrograph (SEM) of spirochaetes (pink) from a contaminated water sample. Spirochaetes are a group comprised of six genera of bacteria in a family known as Spirochaete. They are named because of their spiral shape. Typically, spirochaetes are very slender. Their length can vary from about five microns to several hundred microns, depending on the species. Spirochaeta are free-living nonpathogenic inhabitants of mud and water, typically thriving in anaerobic (oxygen-deprived) environments. Other species of spirochaetes however are a significant health threat to humans. Both syphilis and Lyme disease are caused by spirochetes. Beneficially, spirochetes contribute to digestion in ruminants such as cows. Other bacteria (green) are also present in the image. Magnification: x7000 when printed at 10 centimetres wide.

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