D. PHILLIPS / SCIENCE PHOTO LIBRARY D. PHILLIPS / SCIENCE PHOTO LIBRARY
False colour scanning electron micrograph (SEM) of a colony of the rod-shaped, Gram-negative bacteria Escherichia coli. E.coli, as the bacterium is commonly known, is found in the human intestines, where it is normally harmless. Under certain conditions it may become pathogenic, causing urinogenital infections & diarrhoea. It is also the organism most commonly used in microbiological studies & genetic engineering experiments. Magnification unknown.
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