DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of Pseudomonas syringae, Gram-negative, aerobic, enteric, rod prokaryote. Pseudomonas syringae is a plant pathogen which can infect a wide range of plant species, and occurs as over 50 different pathovars. P.yringae can act as nuclei for the formation of ice crystals in cold temperatures. This ability was discovered during research into frost prevention for plants. The ice-minus variant of P. syringae a mutant, lacking the gene responsible for ice-nucleating surface protein production. This lack of surface protein provides a less favourable environment for ice formation. Pseudomonas sp. are able to grow in extreme environments. Any carbon or hydrocarbon source is a suitable place for them to live. Magnification: x3,400 when shortest axis printed at 25 millimetres.
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