The concept of using photochemical probes in the study of biological systems was developed by Westheimer who published the first photoaffinity labeling experiments more than twenty years ago (J.Bio1. Chem. 237, (1962) 3006). Since then the concept has been used successfully in various areas of biochemistry and recently several new interesting and exciting aspects of the concept have been developed. It is the general opinion by scientists in the "field" that the full potential of photochemical probes in biochemical studies has far from been exploited yet. This is mostly due to the interdisciplinary character of the concept involving photochemistry, synthetic chemistry as well as biochemistry/molecular biology. The perspective of the NATO advanced workshop on "Photochemical Probes in Biochemistry", held in Holte (Copenhagen) Denmark 14-19, August, 1988, was several fold. The workshop was to give an account of the "state of the art" of using photochemical probes in biochemistry as well as to bring together specialists in photochemistry, syn thetic chemistry and molecular biology in order to analyze advantages as well as the inherent problems and pitfalls of the concept and provide suggestions and guidelines for fu ture research. Furthermore, it is the hope of the editor that the present publication which gives an account of the lectures presented at the workshop, will provide an introduction to scientists who are not familiar with photochemical probes, but to whom these could help answer central and pertinent questions.

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Concepts of Biology is designed for the single-semester introduction to biology course for non-science majors, which for many students is their only college-level science course. As such, this course represents an important opportunity for students to develop the necessary knowledge, tools, and skills to make informed decisions as they continue with their lives. Rather than being mired down with facts and vocabulary, the typical non-science major student needs information presented in a way that is easy to read and understand. Even more importantly, the content should be meaningful. Students do much better when they understand why biology is relevant to their everyday lives. For these reasons, Concepts of Biology is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand.We also strive to show the interconnectedness of topics within this extremely broad discipline. In order to meet the needs of today's instructors and students, we maintain the overall organization and coverage found in most syllabi for this course. A strength of Concepts of Biology is that instructors can customize the book, adapting it to the approach that works best in their classroom. Concepts of Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand--and apply--key concepts.