The origin of this text was a request by industry and government to summarize the biological effects and to estimate the limits of safe exposure to longwave ul- traviolet radiation. The specific issue was the safety of a small medium-pressure mercury arc designed to emit UV-A (NUVA-Lite, L. D. Caulk Co., Milford, Delaware) for photopolymerization of resinous fillings used in dentistry. How-- ever, the context grew to become a consideration of the risks and benefits to hu- mans of electromagnetic radiation between the biologically active short UV and the visible spectrum. We have accumulated...

This report presents a summary of the forest monitoring data collected in 2008 by the National Capital Region Network Inventory and Monitoring Program. The data collected is used for reporting on three vital signs: forest condition, exotic invasive plant species, and forest pests and diseases.

In this book we attempt to summarize the present state of knowledge in the field of photoimmunology and to provide the background necessary to put this knowledge into perspective. This objective requires descriptive overviews in photobiology, immunology, and dermatology. Our hope is to facilitate interdis ciplinary communication and to stimulate interest in photoimmunology. Section I, Principles of Photoimmunology, describes (1) basic interactions between UV and visible radiation and biologic matter, (2) the optical properties of human skin, and (3) normal and abnormal responses to UV...

Mercy is a marginalized virtue in contemporary public life, but understanding its complex conceptual history suggests how that might change.