E. coli bacteria, coloured transmission electron micrograph (TEM). E. coli are Gram-negative rod-shaped bacteria that are part of the normal flora of the human gut. Some strains produce a toxin that causes severe diarrhoea and can be fatal, especially in the very young or elderly. Magnification: x12,000 when printed at 10 centimetres wide.
September 12th, 2018
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