Arginine. Molecular model of the amino acid arginine. Its chemical formula is C6.H14.N4.O2. Atoms are represented as spheres and are colour- coded carbon (blue), hydrogen (gold), oxygen (red) and nitrogen (dark blue). Amino acids are the building blocks of proteins. Arginine is a semi-essential amino acid. It can be synthesised by the body and so does not need to come from the diet. However, infants and children are unable to synthesis sufficient quantities for normal growth and so must obtain some from animal or plant proteins. Arginine plays an important role in the production of urea, the principal form in which mammals excrete nitrogenous compounds from the body. It also plays a role in wound healing and cell division.
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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