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Your search has returned 15 articles:
  • News

    Double cord-blood transplant helps cancer patients

    For patients with blood diseases who need a stem cell transplant, doctors often turn to umbilical cord blood. But the small supply of blood in each cord is often inadequate to meet the needs of an adult patient (SN: 10/26/02, p. 261: Blood Booster: Growth signal shifts cord stem cells into high gear).

    To up the stem cell dose in each transplant, researchers gave 32 adults with lethal...

    12/30/2002 - 11:05 Biomedicine
  • Feature

    Breathtaking Science

    Nearly 2,400 years ago in a treatise aptly titled "On Breath," Aristotle posed a question that continues to captivate scientists today: "How can we account for the maintenance of the breath inherent in us, and for its increase?" In a suburb just outside Washington, D.C., Jeffrey C. Smith shows just how close modern researchers are to answering that question. With the aid of a powerful...

    12/30/2002 - 10:00
  • Feature

    Hawaii's Hated Frogs

    Puerto Rico's beloved mascot is a miniature tree frog named for its distinctive call: ko-KEE. All night long, choirs of love-starved males serenade would-be mates, who respond with quiet guttural chuckles. "To me, it's pleasant—just like birds singing," says Bryan Brunner, a University of Puerto Rico plant breeder in Mayaguez. "Here, everybody loves the coquies." And legend has it, he says,...

    12/27/2002 - 11:18 Earth & Environment
  • News

    Clear Skin: Injections counteract psoriasis in patients

    Injections of an immune system protein can alleviate skin problems in people with psoriasis, a German-Dutch research team reports. The well-tolerated protein, called interleukin-4, works as well as a powerful standard therapy known to cause severe side effects. If the results are confirmed in larger studies, interleukin-4 could offer an alternative therapy for this difficult-to-treat disease...

    12/26/2002 - 07:39 Biomedicine
  • News

    Coffee Jitters: Caffeine boosts predictor of heart problems

    Whether it comes from coffee or another source, caffeine gives a troubling boost to one biological indicator of poor heart health, a new study suggests. Moreover, other ingredients in coffee appear to at least double the effect of caffeine alone.

    Past studies have shown that drinking coffee can increase blood concentrations of the amino acid homocysteine, which has been...

    12/26/2002 - 07:34 Nutrition
  • News

    Secrets of Memory All-Stars: Brain reflects superior recollection strategy

    Some people have flypaper memories. Bits and pieces of information stick in their minds, enabling them to remember a dizzying array of stuff.

    These memory all-stars aren't smarter than the rest of us. Nor do they possess brains equipped with beefed-up memory centers. According to a report in the January Nature Neuroscience, their advantage lies in a propensity to use a learning strategy...

    12/26/2002 - 07:28
  • News

    Homing Lobsters: Fancy navigation, for an invertebrate

    Scientists willing to drive boats and cars in convoluted patterns say that spiny lobsters are the first animals without backbones to pass tests for the orienteering power called true navigation.

    This capability lets homing pigeons and a few other animals figure out not just compass orientation–which way is north–but also their current address on the planet, explains Larry...

    12/26/2002 - 07:21 Animals
  • News

    Sulfur Studies: Early Earth's air was oxygen-poor

    Analyses of ancient sulfide minerals and the modern organisms that create sulfides are giving scientists a better idea of what Earth's atmosphere and oceans may have been like billions of years ago. The findings may also explain a paradox that has long puzzled solar astronomers.

    In one of the new studies, scientists looked at the ratio of isotopes in sulfide particles trapped in...

    12/26/2002 - 06:58 Earth
  • News

    Fracture Protection: Nanotubes toughen up ceramics

    Ceramics are famous for being hard but easy to break. Now, researchers have demonstrated that adding carbon nanotubes to a ceramic material can nearly triple its resistance to fracturing.

    Since carbon nanotubes were discovered a decade ago, ceramics researchers have tried to exploit the tiny tubes' extraordinary strength and flexibility to make much more fracture...

    12/26/2002 - 06:45 Materials
  • News

    Brain learns to sharpen its focus

    Practicing a perceptual skill dramatically alters the way the visual system works, according to a study that appears in the Dec. 24, 2002 Proceedings of the National Academy of Sciences. For people tested on their ability to spot subtle visual distinctions, practice on the task beforehand results in intensified activity in the neural gateway for information from the eyes, say Sophie Schwartz...

    12/19/2002 - 11:33