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Your search has returned 18 articles:
  • News

    Smells Funny: Fish schools break up over body odor

    Just an hour's swim in water lightly contaminated with a common pollutant can turn fish into rejects with an odor that causes their untainted schoolmates to shun them, researchers say.

    In a lab test, brief exposure to 4-nonylphenol (4-NP), a surfactant used in many soaps, detergents, and other products, disrupted the normal tendency of banded killifish (Fundulus diaphanus)...

    10/24/2007 - 10:35 Animals
  • News

    Not So Clear-Cut: Soil erosion may not have led to Mayan downfall

    Hand-planted maize, beans, and squash sustained the Mayans for millennia, until their culture collapsed about 1,100 years ago. Some researchers have suggested that the Mayans' very success in turning forests into farmland led to soil erosion that made farming increasingly difficult and eventually caused their downfall. But a new study of ancient lake sediments has revealed that most erosion...

    10/24/2007 - 10:16 Anthropology
  • News

    Odd Couples: Big black holes challenge star theory

    The most massive stars in the universe collapse to form black holes at the end of their lives. Theory suggests that such black holes can't have much more than about 10 times the sun's mass, but a team has now identified one that tips the scales at 15.65 times the sun's mass. Another research group has tentative evidence of an even bigger beast.

    The findings may call into...

    10/24/2007 - 10:03 Astronomy
  • News

    Let There Be Aluminum-42: Experiment creates surprise isotope

    Physicists have created the heaviest isotope yet of magnesium, but in their experiments an unexpected isotope of aluminum also showed up. The findings could help astrophysicists understand occasional X-ray emissions from neutron stars that are growing in mass.

    The 7-day-long experiment took place at the National Superconducting Cyclotron Laboratory (NSCL), an atom smasher at Michigan...

    10/24/2007 - 09:39 Physics
  • News

    Good Buzz: Tiny vibrations may limit fat-cell formation

    Young mice that spend time on a mildly vibrating platform increase muscle and bone production at the expense of fat, researchers report. The finding suggests that exposure to subtle mechanical movement—even a modest buzz—might beneficially influence cell formation, says study coauthor Clinton T. Rubin, a bioengineer at Stony Brook (N.Y.) University.

    Rubin's team tested laboratory mice...

    10/24/2007 - 09:14
  • News

    Catch a Wave: Carbon nanotubes go wireless

    Despite all the hubbub about carbon nanotubes as possible building blocks of superstrong materials or as components of supersmall electronics, few practical applications have yet come to fruition. Integrating nanotubes into functioning electronic devices has proved especially difficult, but researchers have now built a carbon-nanotube component into a simple radio receiver.

    10/24/2007 - 08:46 Technology
  • News

    Digging the Scene: Dinos burrowed, built dens

    Paleontologists have unearthed an ancient, sediment-filled burrow that holds remains of the creatures that dug it. The find is the first indisputable evidence that some dinosaurs maintained an underground lifestyle for at least part of their lives.

    While scouring 95-million-year-old strata in southwestern Montana, paleontologist David J. Varricchio of Montana...

    10/24/2007 - 08:36 Paleontology
  • News

    HIV-positive people getting heavier

    From San Diego, at a meeting of the Infectious Diseases Society of America

    Exaggerated weight loss—wasting—used to be a hallmark of HIV infection. With the success of new medicines, however, that appears to be changing. In two hospitals, at least, people with HIV are becoming overweight or obese at the same rate as the U.S. population in general.

    A survey of 663 HIV-infected...

    10/23/2007 - 15:07 Biomedicine
  • News

    'Knuckle fever' reaches Italy

    From San Diego, at a meeting of the Infectious Diseases Society of America

    An exotic virus that debilitates victims with fevers and joint pain has spread from Africa and India to Italy, where it has caused at least 284 cases of illness.

    The chikungunya-virus outbreak began in 2004 on Lamu, an island off the east coast of Africa, says Robert Breiman, an epidemiologist at the...

    10/23/2007 - 14:59 Biomedicine
  • News

    Twice bitten

    From San Diego, at a meeting of the Infectious Diseases Society of America

    Second episodes of Lyme disease are probably caused by a second tick bite rather than a return of the original illness, according to a first-of-its-kind study.

    Lyme disease is the most common tick-borne disease in the United States, infecting about 20,000 people each year. The disease is caused by the...

    10/23/2007 - 14:52 Biomedicine