Downy mildew infection. Light micrograph of a section through a grapevine (Vitis sp.) leaf infected with downy mildew (Plasmopara viticola). Each downy mildew spore germinates and forms a tube that penetrates the leaf's stomata. Together the tubes form a matrix of mycelium that penetrates the cells of the leaf and extracts the nutrients. Hyphae then produce sporangiophores (blue, branching) which protrude through the stomata to the outside of the leaf. They bear sporangia (red-purple) that contain spores and form white, grey or violet patches on the leaves. Magnification x70 when printed 10 centimetres wide.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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