Ruhli notes researchers used that technique to study the evolution of the tuberculosis bacteria from 2,000-year-old mummified tissue to modern-day strains.

VOA: standard.2010.05.05

Jackson says having one genome in hand will make it easier to spot useful genetic variations in other strains.

VOA: standard.2010.02.01

A combination vaccine, using strains of HIV common in Thailand,was tested on Thai men and women aged 18 to 30 years old, who were HIV-negative.

VOA: standard.2009.10.20

When they listen to his mazurkas and polonaises, they hear not only the strains of Polish folk music, but also nostalgia and patriotism for his homeland.

VOA: standard.2010.03.04

The discovery should dramatically speed up the process of breeding better strains.

VOA: standard.2010.02.01

The growing strains stem largely from Ankara's increasing criticism of Israel's occupation of Palestinian territory, and more recently, Ankara' canceled joint military exercises with Israel scheduled for later this month.

VOA: standard.2009.10.27

In a number of races around the country, strains are developing between some traditional Republican candidates and more conservative politicians who want to return the party to what they believe are its more conservative roots.

VOA: standard.2010.05.04

Other infectious disease experts,however, have insisted Australia's is over-reacting to the outbreak of the A-H1N1 virus, insisting that,so far, the disease is no worse than other strains of influenza that kill hundreds of Australians every year during the colder winter months.

VOA: standard.2009.05.30

At the same hearing, he says in one of the best studies used molecular fingerprinting to follow an outbreak of drug-resistant bacteria: "You actually can trace the specific bacteria around and they find that the resistant strains in humans match the resistant strains in the animals."

VOA: standard.2010.07.21

Some want an independent review. And the trial's researchers, like Dr.Nelson Michael, of the Walter Reed Institute of Research in the United States, say it's unclear what difference the findings will make for areas like Africa where rates of HIV/AIDS are much higher than among the test population and where there are many strains of the virus.

VOA: standard.2009.10.20