Sleeping pill molecule. Computer model of a molecule of the sleeping pill drug triazolam. Atoms are represented as spheres and are colour- coded carbon (purple), hydrogen (white), nitrogen (pink) and chlorine (green). Triazolam belongs to a group of drugs, known as benzodiazepines, that are used to treat insomnia. It promotes sleep by enhancing the effects of the neurotransmitter gamma-aminobutyric acid (GABA), which inhibits nerves and brain activity. The drug has a short half-life and so does not cause drowsiness the next morning. Triazolam was banned in the UK in 1991 due to a high frequency of psychiatric side effects, which include hallucinations, paranoia and aggression.
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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