Panton-Valentine toxin. Computer artwork of the molecular structure of a sub-unit of the Panton- Valentine leucocidin (PVL) toxin from the bacteria Staphylococcus aureus. The alpha-helical (cylinders) and beta-sheet (flat) structure is shown. This is the F sub-unit, it combines with a S sub-unit to form the toxin. PVL targets white blood cells, part of the body's immune system. It makes pores in the white blood cell's membrane, causing the cell contents to leak, thus killing the cell. This destruction of cells leads to skin and soft tissue infections. These are mainly abscesses, but it can also cause pneumonia. The toxin has been found in strains of the antibiotic- resistant MRSA (methicillin-resistant S. Aureus) bacteria.
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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