But traditional guidelines say not to use tPA if more than three hours have passed after the first signs of a stroke.

VOA: special.2009.08.12

Some experts think banks have seen the worst of their losses and that the worst of the financial crisis may already have passed.

VOA: special.2009.04.17

But recent findings suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.09.22

But recent findings have suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.08.12

The American Lung Association says half of the fifty states have passed smoke-free laws.

VOA: special.2009.05.27

On May fifteenth, just seventeen days after leaving New York, Captain Creesy wrote this in the Flying Cloud's log: "We have passed the Equator in two days less time than ever before.

VOA: special.2009.12.23

(Speaking) Travelers facing even greater scrutiny come from, or have passed through, the 14 nations that the U.S.

VOA: standard.2010.01.05

Variations of it have passed recently in Vermont,California, and Oregon.

VOA: standard.2010.03.23

Weeks have passed support, since President Obama's top commander in Afghanistan formally urged the White House to order a swift surge of U.S.troops to battle militant extremists in the violence-plagued nation.

VOA: standard.2009.11.23

There have been laws that have been passed, and many police officers and other authorities are being trained about this.

VOA: special.2010.06.24

This is the first time scientists have successfully passed on a foreign gene to a future generation.

VOA: special.2009.06.23

More than forty percent of Americans have an ancestor who passed through Ellis Island.

VOA: special.2009.06.29

The Senate and House of Representatives have each passed their own health care legislation.

VOA: special.2010.01.23

Fifty years have now passed without any changes to the American flag.

VOA: special.2010.04.02

That person must have been surprised when the substance passed the test.

VOA: special.2010.02.09

"You can imagine the impact that this would have on whole communities throughout the country and why there would be such passions that have been passed on from generation to generation even at the remove of one hundred fifty years."

VOA: special.2011.04.09

"And the only think worse than the policy itself has been the process that the Democrats have followed to get this passed,".

VOA: standard.2009.12.27

Since the federal law was passed a decade ago, many state and local communities have followed suit.

VOA: standard.2010.02.18

That information should have been passed on to U.S.databases, but it is unclear if that actually happened.

VOA: standard.2009.12.28

The measure then would have to be reconciled with the House-passed legislation before a final bill is sent to President Obama for his signature.

VOA: standard.2009.05.20

"We did our job. A significant phase has been passed through with as little harm done as conceivably could have been done under the circumstances.

VOA: standard.2010.04.21

More than 2 million jobs have been lost since Congress passed Mr.Obama's in February.

VOA: standard.2009.07.14

"We have lost two-million jobs since the stimulus bill was passed,".

VOA: standard.2009.08.02