Parasitic protozoa erupting from a stomach cell. Coloured scanning electron micrograph (SEM) of several merozoites (yellow) of the Cryptosporidium sp. protozoan parasite. The parasite causes a disease called cryptosporidiosis and has a complicated life cycle. Merozoites are the result of asexual reproduction and when released from the stomach or intestinal cells, may repeat asexual reproduction, or may reproduce sexually to form the oocyst stage that passes between hosts in infected faeces. This parasite causes diarrhoea.
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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