11.   Hospitals throughout New York City were put on a heightened state of alert.

12.   In future storms, they will exhibit a heightened state of alarm, she said.

13.   Indeed, the Cole was reportedly on a heightened state of alert on Thursday in preparation for its four-hour refueling stop.

14.   In this heightened state, signals that turn on genes are released.

15.   It describes the passage from an initial state of equilibrium through one or more unbalancing episodes to a heightened state of equipoise.

16.   Kelly said the school would conduct a security sweep sometime before classes start today and that staff would be on a heightened state of alert.

17.   Last week, U.S. forces in Bosnia went on a heightened state of alert.

18.   Later, however, Hendry conceded that the Alomar incident has put umpires in a heightened state of alert.

19.   Many office and government buildings throughout the city went on a heightened state of alert Tuesday, police said.

20.   Meanwhile, across the nation, law enforcement agencies went on a heightened state of alert, on guard for a possible retaliatory terrorist strike on US soil.