Selenocysteine. Molecular model of the amino acid selenocysteine. Its chemical formula is C3.H7.N.O2.Se. Atoms are represented as balls and are colour-coded carbon (blue), hydrogen (yellow), nitrogen (dark blue), oxygen (red) and selenium (orange). Amino acids are the building blocks of proteins. Selenocysteine is an essential amino acid. Selenium, its core component, needs to be obtained from food in order for the body to make the amino acid. Brazil nuts have the highest concentrations of selenium, but it is also found in seafood, fish, meats, eggs and cereals. Selenocysteine is an important component of many enzymes, such as glutathione peroxidases, a group of antioxidant enzymes.
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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