Transdermal drug delivery methods, composite computer artwork. Transdermal devices deliver controlled doses of drugs through the skin directly into the bloodstream. At top is a transdermal patch. The drug is stored in the raised reservoir. This type of patch is commonly used for hormone replacement therapy (HRT) and nicotine patches. At centre is an electric patch. An electric current is passed through 2 electrodes on the skin's surface, causing the drug to be pushed through the skin. This process, iontophoresis, is being developed for large ionised drug molecules. At bottom is an ultrasound machine, which uses ultrasonic frequencies to transfer high molecular weight drugs through the skin, a process known as phonophoresis.
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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