Light micrograph of an unidentified species of desmid, a type of green alga. Members of this group show great morphological variety but are related by common features of cell structure and method of reproduction. Most desmids are unicellular, with a single nucleus and one or more chloroplasts (the site of photosynthesis within the cell). The cell walls all have a inner layer rich in cellulose and an outer, thickened pectin layer. Dark field illumination. Magnification unknown.
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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