21.   Ferriter said researchers are looking for a poison that can kill the fern without destroying other plants, and might use some combination of flood and fire.

22.   Everything the researchers looked at, even the patterns of the fungal family trees, indicated that the fungi were having sex.

23.   For the most part, researchers have looked to large-scale environmental changes.

24.   For the first time, researchers looked at federal quality-control records for patients in Medicare managed-care plans.

25.   Harvard University researchers are looking for an elusive protein in fly saliva that thins the blood of victims, allowing greenheads to feed amply off the crimson flow.

26.   He said researchers first look at a particular crop and the amino acids in which it is deficient.

27.   Herbal product makers criticized the new study, saying researchers looked at the wrong kind of patients.

28.   Henney said FDA researchers are looking at whether animal organs might carry viruses that could infect humans.

29.   However, as the rates of asthma and some cancers grow, researchers look at the proliferation of toxic chemicals as possible causes.

30.   In another study, researchers looked at male and female MBAs who had risen to within three levels of the chief executive position.