Search Results for: Bears

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6,903 results

6,903 results for: Bears

  1. Protein Portal: Enzyme acts as door for the SARS virus

    A protein that regulates blood pressure also serves as the cellular portal for the SARS virus.

    By John Travis
  2. Earth

    Ash Clouds: Severe storms can lift smoke into stratosphere

    New field observations, satellite images, and computer models suggest that a severe thunderstorm, enhanced by heat from forest fires, can boost soot, smoke, and other particles as far as the lower stratosphere, an unexpected phenomenon.

    By Sid Perkins
  3. Earth

    Ash Clouds: Severe storms can lift smoke into stratosphere

    New field observations, satellite images, and computer models suggest that a severe thunderstorm, enhanced by heat from forest fires, can boost soot, smoke, and other particles as far as the lower stratosphere, an unexpected phenomenon.

    By Sid Perkins
  4. Astronomy

    Cradled galaxies betray violent past

    Hubble snaps ‘the Penguin’ and its egg-shaped companion.

    By Jessica Shugart
  5. Life

    Ancient horse’s DNA fills in picture of equine evolution

    An entire genome compiled from a 700,000-year-old bone yields new information about equine history.

    By Tina Hesman Saey
  6. Genetics

    Technique inactivates Down-causing chromosome

    Though far from a cure, the advance could eventually lead to gene therapy that alleviates some symptoms.

    By Tina Hesman Saey
  7. Life

    Rogue genes on X chromosome turn on in testicles

    Chunks of rapidly evolving DNA could affect sperm production in males.

    By Jessica Shugart
  8. Animals

    Eye-tracking cameras show peahens’ wandering gaze

    Data show that female birds are not so riveted by their suitors’ magnificence

    By Susan Milius
  9. Humans

    Y chromosome analysis moves Adam closer to Eve

    A pair of genetic studies has pushed back age of men's most recent common ancestor.

    By Erin Wayman
  10. Life

    Evolution of mammalian monogamy remains mysterious

    Two large studies reach opposing conclusions about why males stay with females.

    By Cristy Gelling
  11. Materials Science

    Toylike blocks make lightweight, strong structures

    Bucking trend toward reducing numbers of parts, MIT engineers suggest building planes from thousands of identical pieces.

    By Meghan Rosen
  12. Astronomy

    ‘Space beads’ push back origins of iron working

    Ancient Egyptians used advanced techniques to make beads out of 'metal from the sky.'

    By Bruce Bower