Light-dependent therapies, such as photodynamic therapy and extracorporeal photopheresis, are not new, but have remained of interest to chemists and health care professionals since the middle of the twentieth century. While most people link light-dependent therapies only to the treatment of cancer, these therapies may be of use for a diverse set of medical conditions, from acne to AIDS. The techniques arise directly from the application of chemical concepts, such as spectroscopy, MO theory, and organic chemical reactions. Because of its application to health care, the field of photochemistry provides a tool to demonstrate the significance of chemistry to a socially important issue.
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