The Centers for Disease Control says HEPA filters are effective in clearing the air of many particles that cause disease.

VOA: special.2009.07.14

The study in Benin found that solar-powered pumps are effective in supplying water, especially during the long dry season.

VOA: special.2010.01.11

So far it has proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.07

The vaccine has already proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.22

In the United States, the Armed Forces Radiobiology Research Institute is looking for more-effective treatments for radiation exposure.

VOA: special.2011.03.30

"If I felt that I could have been increasingly effective in that job, I suppose I would have continued to do it.

VOA: special.2010.05.09

He says there is clear evidence of the kinds of policies and programming interventions that can be most effective in combating the problem.

VOA: special.2010.05.17

And it sank,too. The Confederacy also developed very effective underwater explosive devices for use in the harbors.

VOA: special.2009.09.10

He says the study shows that, in theory,white roofs could be effective in reducing urban heat.

VOA: special.2010.03.02

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

Scientist Ian Wilson at the Scripps Research Institute in California says the antibodies proved highly effective in laboratory mice exposed to deadly levels of virus.

VOA: special.2009.03.04

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

And again, Americans all around the country took note of this quiet,serious man who did such effective work in so many different kinds of situations.

VOA: special.2011.02.10

In another study, the vaccine was effective in reducing clinical malaria by thirty-five percent.

VOA: special.2010.04.20