1.   Swamping future historians with vast amounts of digital information may impede their research as they attempt to navigate through it.

2.   Atlas of the American Society of Microbiology said banning all foreigners from labs would seriously impede research.

3.   But other scientists and drug-company executives say the new laws may impede research that promises to yield immense therapeutic benefits.

4.   Still, many scientists worry that restrictions may merely impede research aimed at countering biological agents and treating infectious diseases, without really deterring terrorists.

5.   The coalition also says that, as a practical matter, patenting the breast cancer gene could impede cancer research.

6.   Marivaux said follow-up research is being impeded by the bombing of Afghanistan and the instability it has created in the region.

7.   Michael Mithoefer said the fact that Ecstasy is a hot commodity among some teen-agers should not impede research.