Ever since our remote ancestors discovered how to use fire, we human beings have continued striving to develop science and technology. Over the long span of human history, science and technology have constantly helped to improve our standards of living. Yet, people continue their quest for healthier and more comfortable living. Today, we are faced with the global challenge of environmental degradation. I believe that it is the responsibility of all scientists and engineers to resolve this challenge, for both present and future generations. Ishihara Sangyo Kaisha, Ltd. (ISK), in seeking cooperation from people all over the