41.   --Can chemicals be used to slow down memory loss, make memories sharper and help the brain repair itself from injury?

42.   Called the Acid Phosphatase Test, which also uses two chemicals.

43.   Cheap but effective herbicides like atrazine have been restricted, putting pressure on farmers to be more careful about how many chemicals they use and when they use them.

44.   Chemicals are used in plastics and other materials used to make automobiles.

45.   Chemicals should be used judiciously, she added.

46.   Commodity chemicals are widely used as building blocks for other chemicals and plastics.

47.   Do not use more chemicals than you need.

48.   Experts say that the process, which uses chemicals that gum up the genetic material of germs, could eliminate the rare cases of AIDS transmission through transfusions.

49.   Fire marshals and hazardous-materials investigators for the state Department of Environmental Conservation were trying to determine what chemicals were used and stored at the site.

50.   Fireflies use the chemical as a defense against predation, Eisner said, and have one of the highest concentrations of steroids found in nature.