Light micrograph of Nostoc sp., a blue-green nitrogen-fixing algae which grows in the absence of combined nitrogen and converts gaseous nitrogen into a usable form. Useful in enriching the soil, for instance in rice culture, it is a filamentous organism which forms chains of individual creatures. Aggregations of Nostoc form mucilaginous masses, usually seen resting on the soil. It is also being investigated for possible applications in biotechnology. Phase contrast micrograph. Magnification x160 at 35mm, x320 at 6x7cm size.
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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