1.   American biologists have called for the establishment of a network of trained amateurs drawn from local populations to help tap potential medical resources of tropical forests.

2.   An American biologist who studies butterflies simply said it smelled like his laboratory.

3.   A team of American biologists is starting to explore the possibilities by weaning Earth bacteria onto a diet that they would not normally encounter on this planet.

4.   But an American biologist who works for the Defense Department on germ defenses said the finding was more surprising than that.

5.   Famous American biologists do not need to learn how to fix old equipment when it breaks.

6.   Parsegian has recruited several Russians whose backgrounds in physics and chemistry have helped American biologists better understand the forces that control living cells.