DNA

Osama bin Laden shot dead by US forces in firefight

Osama bin Laden, the slippery chief of the dreaded terrorist outfit Al-Qaeda, was shot dead by a CIA-led team at a compound inside Pakistan Sunday night, bringing to a close the world's highest-profile manhunt of the decade.

Global data equivalent to US covered in 13 layers of books

Can you guess the amount of information stored in the world? Scientists have measured the data available and found it to be 295 exabytes by 2007. An exabyte is equal to ten to the power of 18 bytes. Scientists say that information is equivalent to 1.2 billion hard drives.

Smoking damages genes in minutes--study

Health hazards of smoking are known to all, but did you know that damage starts much earlier than thought?

DNA identifies rare Australian bird

Adelaide, Australia -- Australian researchers using DNA says they have identified a new but critically endangered species of parrot in Western Australia.

DNA experts from the University of Adelaide using museum specimens up to 160 years old say populations of ground parrots in eastern and western Australia are highly distinct from each other and that the western populations should be recognized as a new species, Pezoporus flaviventris, BiologyNews.net reported.

"The discovery has major conservation implications," said research leader Stephen Murphy of the Australian Wildlife Conservancy.

Single drop of blood could reveal age

Rotterdam, Netherlands -- Dutch researchers say they've developed a way to tell a person's approximate age from one drop of blood, a test that could be used in crime investigation.

Scientists at Erasmus University Medical Center in Rotterdam say as a forensic technique it could be used to revive police investigations that have hit a dead end, AAAS ScienceMag.org reported Monday.

The blood-age test relies on a peculiarity of T cells, immune cells in the body that recognize and fight microbial infections.

As T cells develop, they modify their DNA to recognize a wide variety of bacteria and other pathogens.

In the modification, some DNA is left over that is useless to the T cell, which discards it, researchers say.

Study: Europe's first farmers invaded

Adelaide, Australia -- An international team led by DNA experts in Australia says it has resolved the longstanding question of who introduced farming to Europe about 8,000 years ago.

A detailed genetic study of one of the first farming communities in Europe, in central Germany, reveals marked similarities with populations living in the Ancient Near East -- modern-day Turkey, Iraq and other countries -- rather than those from Europe, a release from Australia's University of Adelaide says.

Progress to lethal stage slow in pancreatic cancer--study

Contrary to popular belief that pancreatic cancer is an aggressive form of malignancy right from the onset and spreads to other organs very quickly, a new study claims that the ailment in fact progresses to the lethal stage slowly.

Passenger pigeons' family tree set

Champaign, Ill. -- The place of the extinct passenger pigeon in the family tree of pigeons and doves has been determined using century-old DNA samples, researchers say.

With a bit of DNA from stuffed museum specimens, scientists at the University of Illinois have determined the passenger pigeon was most closely related to other North and South American pigeons and not to the morning dove, as was long believed, a university release said.

One of North America's most spectacular birds was also one of the first to be driven to extinction, researchers said.

Study finds ADHD linked to genes, not poor parenting

Contrary to popular belief that unhealthy eating habits and bad parenting is responsible for children developing attention deficit hyperactivity disorder (ADHD), a new study claims it is a genetic condition.

Parrot attacks burglars

Coventry, England -- A young parrot that attacked burglars who invaded an English pet store could crack the case, police said, because it obtained DNA samples.

Caroline Hobday, who owns Hobday's Pet Shop in Coventry, called Jack, a sun conure parrot, a hero, saying the bird may have prevented thieves from taking more and doing worse damage, The Mirror reported. The burglars, who left a blood trail, made off with three corn snakes and another parrot late Tuesday or early Wednesday, killed some tropical fish and tore a lizard's tail off.

School performance linked to gene variants

Tallahassee, Fla. -- Academic performance in adolescents will suffer if their DNA contains one or more of specific dopamine gene variations, a U.S. study says.

Florida State University researchers says performance in at least one of four key subjects -- English, math, science or history -- can fall during middle and high school based on the interplay of specific genes, a university release says.

African museum to do DNA test on dodo egg

Johannesburg, South Africa -- A South African museum says it has the world's last surviving dodo egg and is preparing to allow DNA testing of the precious exhibit to confirm it.

The flightless dodo became extinct in the mid-17th century after being extensively hunted in its native home of Mauritius by visiting sailors and the dogs and cats they brought on voyages with them, which plundered the birds' nests, The Daily Telegraph reported Friday.

The egg was given to South Africa's East London Museum in 1915 by the great aunt of the museums curator at the time, the British newspaper said. It was given to the aunt by a sea captain who made many trips to Mauritius where he said he found it in a swamp.