DR TONY BRAIN / SCIENCE PHOTO LIBRARY DR TONY BRAIN / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) 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, x7000 at 6x7cm size, x27,600 at 8x10-inch size. Reference: MICROCOSMOS, figure 5.15, page 96.
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