Over the years,researchers have identified several substances in the blood that can serve as what they call cardiac biomarkers.

VOA: special.2009.07.15

She believed that training women to serve as support pilots at home could free up men to fly combat operations overseas.

VOA: special.2010.11.08

Jackson was grateful for Van Buren's help, and asked him to come to Washington to serve as secretary of state.

VOA: special.2009.01.01

She is the first woman to serve as solicitor general of the United States and earlier, as head of Harvard Law School.

VOA: special.2010.05.15

But if the plan succeeds, it could serve as a model for America's biggest carmaker,General Motors.

VOA: special.2009.05.01

In the book,he says jeans serve as a sign for two American values, creativity and rebellion.

VOA: special.2009.12.18

The handheld devices serve as a telephone and as an e-mail and Web connection.

VOA: special.2010.06.22

And they serve as nurseries for shrimp and other saltwater organisms.

VOA: special.2010.04.20

Its experts serve as part of the Pacific Tsunami Warning System.

VOA: special.2009.03.17

The employer would serve as sponsor in that case.

VOA: special.2011.05.20

She will now serve as the minority leader.

VOA: special.2011.01.10

The space station complex will serve as observatory, laboratory and workshop for astronauts and cosmonauts who live and work there.

VOA: standard.2009.11.30

The Pakistani government has repeatedly said such attacks kill mostly civilians and only serve as a recruitment tool for Islamic militants.

VOA: standard.2009.06.03

He told the Italian daily La Repubblica that he was "ready to serve as a mediator with Iran,"

VOA: standard.2009.03.18