CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False colour transmission electron micrograph of the bacterium Escherichia coli, a normal member of human intestinal flora. Under certain conditions it may become harmful causing an infection in the intestinal or urinogenital tracts. The micrograph shows the bacterium dividing (binary fission), a pinching in process which divides the cell into 2 daughter cells. The green mass (centre of cells) highlights the nucleic acid (DNA), the genetic information, which lies unbound by a membrane in the bacterial cytoplasm. As experimental laboratory organisms, E.coli have supplied scientists with most of the genetic information available today. Mag: X17,650 (at 35mm size).
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