The American Chemical Society, the world's largest scientific society, with a membership of more than 163,000 chemists and chemical engineers, offers experts in the area of homeland security. Among them:

Dr. Rudy Richardson, University of Michigan,

(on travel Aug. 17-30). Expert in neurotoxicology; can comment on chemical warfare weapons.

Dr. Catherine Fenselau, University of Maryland,

Expert in developments in analytical chemistry to improve homeland defense, including detection, neutralization, detoxification and protection of explosives and chemical and biological agents. Analytical technologies are being used to detect explosives, chemical and biological agents in the air and pathogens in food and livestock.