A protective coating of colloidal silver is painted on the inside and outside of the filter to kill bacteria.

VOA: special.2009.06.22

He explains that as the water freezes, it produces heat,and the ice forms a protective blanket around the tree.

VOA: special.2010.01.12

Two years ago,European researchers reported that aspirin may have what they called a "long-term protective effect against colorectal cancer."

VOA: special.2010.12.14

But new research suggests that this might have a protective effect a few years later when children start school.

VOA: special.2010.12.15

Material from the RQ36 asteroid will be sent back to Earth in a special protective device.

VOA: special.2011.06.22

The aim should be to aggressively create what he calls a "protective barrier" against loneliness.

VOA: special.2010.01.06

This complex system throughout the body makes and transports a protective fluid called lymph.

VOA: special.2011.03.23

But there are many methods and protective devices that can increase a climber's safety.

VOA: special.2009.12.09

Or,a gallery show could include art made from aprons, protective clothing worn when cooking.

VOA: special.2009.08.05

It's like an American school could be a protective box."

VOA: special.2009.11.05

Another form of the enzyme creates a protective effect.

VOA: special.2009.10.20

The fibers form a protective barrier against gunfire.

VOA: special.2011.03.01

But the shutters stayed closed until after astronauts removed the windows' protective covers during a nearly six-hour spacewalk Wednesday.

VOA: standard.2010.02.18

Sergeant Will Blair,a medic, is decontaminating victims in a protective suit in extremely hot temperatures.

VOA: standard.2010.07.26

"We saw a protective effect for drinking more than 4 cups of coffee per day."

VOA: standard.2010.06.30

"We continue to look for ways to engage with Russia on missile defense in a way that is mutually beneficial and protective of countries' security against these new threats we face in the world."

VOA: standard.2010.03.26