Other subjects explored include hydrogen bonding effects on the photochemistry of chromophores in solution, photochemical generation of silicon-centered radicals and their reactions, and photochemical processes at the air-water interface of atmospheric droplets.
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class of psychoactive drugs. It is the world's most widely consumed psychoactive drug, but unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world.
Part II. Caffeine. Caffeine, one of a class of chemicals known as the xanthines, is still prescribed occasionally by physicians. Xanthines (caffeine, theobromine, theophylline) can in varying degrees cause central nervous system stimulation and cardiac stimulation; they also act as mild diuretics.Combined with other drugs, caffeine is sometimes used for headache, particularly migraine, and in some pain remedies (for example, A-P-C capsules). Tobacco was discovered on Columbus's first voyage. Cocaine was found in large areas of South America. Caffeine and LSD-like drugs were found scattered all over the world. During the next two centuries, the Europeans not only adopted nicotine and caffeine but spread them everywhere.