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

VOA: special.2009.06.22

They also suggest actions like providing protective boots to wear while working in fields, and not sleeping on the ground.

VOA: special.2010.01.25

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

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

An astronaut who does work outside the space shuttle usually is wearing more than seventeen pieces of protective equipment.

VOA: special.2011.04.06

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

VOA: special.2010.12.15

We would see all other taxes ended before we surrender any part of the protective tariff system."

VOA: special.2010.05.27

They also brought protective clothes for the beekeepers and equipment to gather and package the honey.

VOA: special.2009.06.29

He says it also shows where to send much-needed medicines, insecticide products and protective mosquito nets.

VOA: special.2010.04.20

In nineteen-thirty-three, he developed protective clothing that made it possible for him to fly very high.

VOA: special.2011.04.06

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

VOA: special.2011.06.22

His campaign workers went to businessmen who had become rich because of high protective tariffs.

VOA: special.2010.05.27

Cleveland said some men had become rich, because protective tariffs let them charge high prices.

VOA: special.2010.05.20

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

VOA: special.2010.01.06

Because of the risk of flooding, the city is surrounded by protective levees and floodwalls.

VOA: special.2010.01.22

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