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Your search has returned 13 articles:
  • News

    Gene dispensers

    From Chicago, at the American Chemical Society Meeting

    Researchers have developed a new means for transferring genes to treat diseases. The gene therapy method relies on a nanoscale architecture with many alternating layers of polyester and DNA. Once this material is inside the body, water degrades the polyester layer by layer, for a slow, controlled release of genetic material to...

    04/10/2007 - 15:16 Chemistry
  • News

    Too Few Jaws: Shark declines let rays overgraze scallops

    A shortage of big sharks along the U.S. East Coast is letting their prey flourish, and that prey is going hog wild, demolishing bay scallop populations.

    That's the conclusion of researchers led by the late Ransom Myers of Dalhousie University in Halifax, Nova Scotia, who died this week. Combining census surveys from the past 35 years, Myers' team...

    03/28/2007 - 11:47 Animals
  • News

    Ghostly Electrons: Particles flit through atom-thin islands

    Confine electrons within microscopically thin layers of material and weird things happen. Experiments on semiconductors in the 1980s demonstrated that to physicists (SN: 10/17/98, p. 247).

    Now, two independent research teams have found that electrons imprisoned within a carbon sheet one atom thick behave in yet other odd ways, unlike anything seen in other materials. The...

    11/09/2005 - 13:09 Physics
  • Feature

    Armor-Plated Puzzle

    A few years after Francis H. Crick and James D. Watson unveiled the structure of DNA in 1953, they rocked the fledgling field of molecular biology again with a bold notion: Viruses are, in part, structured as crystals are. That idea captivated Donald L.D. Caspar and Aaron Klug, who then systematically applied what they knew about crystal geometry to classify and predict the structures that...

    08/29/2005 - 10:49 Numbers
  • Feature

    Will Mr. Bowerbird Fall for a Robot?

    Gail Patricelli wasn't so sure that courtship is really as one-sided as the ill-fated show "Who Wants to Marry a Millionaire?" where contestants strutted, and a watcher of the other sex selected. So, Patricelli decided to build a robot to find out.

    The question of dating dynamics comes up in many species. However, Patricelli is sticking to...

    10/18/2004 - 20:34 Animals
  • News

    Stone Age Combustion: Fire use proposed at ancient Israeli site

    Our prehistoric ancestors may have been a fiery bunch. By about 750,000 years ago, the inhabitants of a lakeshore in what is now northern Israel had learned to build fires in hearths, a research team contends.

    For the next 100,000 years, Stone Age folk who frequented the Middle Eastern site used hearths for what must have been a variety of purposes, including staying warm,...

    04/28/2004 - 13:29 Archaeology
  • News

    Study bolsters head injury, Alzheimer's link

    Veterans who suffered a moderate or severe concussion during World War II face a heightened risk of Alzheimer's disease now that they have reached old age, a new study finds. The research reinforces other evidence that brain trauma can set off a long degenerative process resulting in the confusion, memory loss, and disorientation that mark Alzheimer's disease.

    Using Navy and Marine...

    04/19/2004 - 11:33 Biomedicine
  • Feature

    New PCBs?

    Polybrominated diphenyl ether (PBDE) is hardly a household phrase. Yet it probably should be. Household products ranging from kids' pajamas to computers release these brominated flame retardants. The chemicals have been turning up in house and yard dust, as well as in specimens collected from sewage sludge, streams, and even people's bodies. For 3 decades, manufacturers have been putting...

    10/21/2003 - 10:52 Earth & Environment
  • Food for Thought

    As If You Needed Another Reason to Eat Strawberries (with recipe)

    Whether draped atop shortcake, cooked with rhubarb and slathered over vanilla ice cream, or downed in the garden just after picking, strawberries are one of summer's delights. Now, scientists at Cornell University find that this fragile fruit not only tastes great and contains vitamins but also may offer surprisingly potent benefits in the body's fight against cancer and heart disease.

    10/15/2003 - 13:16 Nutrition
  • News

    Secrets of Dung: Ancient poop yields nuclear DNA

    Researchers have extracted remnants of DNA from an unlikely source: the desiccated dung of an extinct ground sloth that lived in Nevada at the height of the last ice age. The feat is the first recovery of genetic material from cell nuclei of fossils that haven't been sheathed in permafrost. It suggests that scientists may be overlooking caches of fossil DNA preserved in warm arid environments...

    07/09/2003 - 13:34 Paleontology