Human blood cells. Coloured scanning electron micrograph (SEM) of four platelets (thrombocytes, yellow), a red blood cell (erythrocyte, red) & two white blood cells (leucocytes, blue and purple). Platelets are produced in the bone marrow, they are involved in the process of blood clotting. Red blood cells carry oxygen from the lungs to all the cells of the body, and carbon dioxide from these cells back to the lungs. White blood cells are involved with the human immune system. Lymphocytes (blue) recognise foreign antigens and destroy invaders, neutrophils (purple) engulf bacteria and release an antibacterial enzyme (lysozyme). Magnification x4250 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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