1.   Nature produces many chemicals in two forms that are mirror images of each other - so-called left-handed and right-handed molecules.

2.   Some have modified cells that are capable of producing luminous chemicals.

3.   The herrings and preservative had reacted together and produced a chemical which was poisonous to mink.

4.   They produce chemicals that are toxic to their pests.

5.   It is an unusual technological challenge to be certain of the market and racing to produce the chemical to meet it.

6.   A prevailing theory is that the immature retina produces a chemical that stimulates growth of blood vessels.

7.   Algae blooms often kill other marine life by depleting oxygen in the water or producing toxic chemicals.

8.   Coumadin works by preventing the liver from producing a chemical needed to clot blood.

9.   Du Pont, which produces basic chemicals used in the automobile and housing industries, finds that its fate rises and falls with the economy.