DR TONY BRAIN / SCIENCE PHOTO LIBRARY DR TONY BRAIN / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph 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. The fibrous material in the micrograph is the remnants of the nutrient medium in which the bacteria were grown. Magnification: x3500 at 35mm size. Gold tint. Original is BW B230/17M. Reference: MICROCOSMOS, figure 5.15, page 96.
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