Rheumatoid arthritis. Illustration showing the mechanism of rheumatoid arthritis, with bones of the hand in the background. Rheumatoid arthritis occurs when the body's immune system attacks joint tissue. Affected joints become painful and inflamed, limiting movement. The inflamed synovium (joint capsule lining) produces fibrous, vascular tissue called pannus (purple) that grows to cover the articular cartilage. The synovial fluid (white) fills with white blood cells which stimulate the release of enzymes which destroy bone (brown) & cartilage (blue). There is no cure, although drugs may relieve symptoms or check the progress of the disease.
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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