27.3 MB (27.0 MB compressed)
2690 x 3543 pixels
22.9 x 30.0 cm ⏐ 9.0 x 11.8 in (300dpi)
A.B. DOWSETT / SCIENCE PHOTO LIBRARY A.B. DOWSETT / SCIENCE PHOTO LIBRARY
Erwinnia chrysanthemi. Coloured Transmission Electron Micrograph of the bacterium Erwinnia chrysanthemi. Long flagellae can be seen; shorter filaments known as pili are also visible on the cell wall. E. chrysanthemi is a Gram-negative rod- shaped bacteria of the Enterobacteriaceae group. In nature, it causes vascular wilting in a wide range of plants. In the laboratory, this bacteria is grown for the enzyme L-asparaginase which it contains. The enzyme is extracted from E. chrysanthemi and purified as a drug for acute lymphoblastic leukaemia (ALL). ALL is a cancer of white blood cells found largely in children. Magnification: x24, 000 at 6x4. 5cm size.
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