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E. coli bacterium

E. coli bacterium. Coloured transmissionelectron micrograph (TEM) of an Escherichia coli ( E. coli ) bacterium in the early stagesof binary fission, the process by which thebacterium divides. This Gram-negative bacillus(rod-shaped) bacterium normally inhabits the humanintestines. Under certain conditions it mayundergo rapid division, which increases itsnumbers to such an extent that it causesinfection. E. coli cause 80% of all urinary tractinfections, travellers' diarrhoea andgastroenteritis in children. The hair-likeappendages around the bacterium are pili, structures used for bacterial conjugation.Magnification: x17, 500 at 6x7cm size.. Stunning Photo Gifts From Science Photo Library