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Your search has returned 15 articles:
  • Food for Thought

    A Trans Fat Substitute Might Have Health Risks Too

    A controversial nutritional test of a chemically modified fat suggests that the substance may be more harmful, at least in its potential to cause diabetes, than is a trans fat–rich, partially hydrogenated vegetable oil.

    Many food producers are phasing out partially hydrogenated oils, which contain harmful trans fats. For certain products such as baker's shortening and margarine, some...

    02/08/2007 - 09:51 Nutrition
  • News

    Good for Something: Prion protein maintains stem cells

    The same protein that, in an altered shape, causes mad cow disease and other neurodegenerative disorders maintains the body's cache of blood-producing stem cells, a new study suggests.

    Called the prion protein, or PrP, it's scattered throughout the body in mammals. When, in rare occurrences, PrP becomes misshapen, it causes neurodegenerative diseases in cows (SN: 1/10/04, p. 19: Cow...

    02/01/2006 - 12:32 Other
  • News

    Wafting pesticides taint far-flung frogs

    Federal researchers have added new evidence to the growing case that agricultural pesticides blowing into California's wilderness areas have played a role in mysterious declines in frog populations.

    Traces of the common pesticides Diazinon and chlorpyrifos showed up in more than half the Pacific tree frogs sampled in Yosemite National Park, but in only 9 percent of the frogs...

    11/15/2004 - 12:33 Earth & Environment
  • Feature

    Frozen Assets

    Ninety percent of the nation's dairy cows—some 8.2 million animals—belong to a single breed: Holstein. Owing to the dairy industry's extensive reliance on artificial insemination using semen from only the choicest bulls, this Holstein population is heavily inbred. "Today, it's as if there were only about 35 unrelated cows [contributing genes to] our national Holstein herd," explains...

    11/09/2004 - 11:55 Agriculture
  • Food for Thought

    We're Very Supplemented

    Most U.S. adults don't depend solely on food for their nutrition, a new government study finds. Increasingly, men and women reach for pills—vitamins, minerals, and other commercial supplements—to insure against the possibility they're not eating a healthy diet.

    Researchers collected data on supplement taking during 1999 and 2000 from participants in the National Health and...

    08/26/2004 - 14:18 Nutrition
  • Feature

    On Shifting Ground

    Earthquakes now endanger more people than ever. The world population has more than doubled in the past 50 years and, by 2007, half of the planet's 6.6 billion people will be living in urban centers. Because more than 380 major cities lie on or near unstable seams in the Earth's crust, one seismologist has come to a grim conclusion: A catastrophic temblor sufficient to kill 1 million people...

    08/19/2003 - 11:18 Earth
  • Feature

    In Search of a Scientific Revolution

    Plenty of people claim to have theories that will revolutionize science. What's rare is for other scientists to take one of these schemes seriously. Yet that's what's happened since May 2002 when theoretical physicist Stephen Wolfram self-published a book in which he alleged to have found a new way to address the most difficult problems of science. Tellingly, he named this treatise A New Kind...

    08/12/2003 - 12:48 Humans & Society
  • Feature

    Words Get in the Way

    Law-enforcement officials typically solicit descriptions of criminals from eyewitnesses, often just after an offense has occurred. It stands to reason that thorough accounts by those who saw what happened will help investigators round up the likeliest suspects. Eyewitnesses can then pick the criminals out of a lineup. When crime-scene interviewing had its first brush with memory research in...

    04/15/2003 - 10:25 Other
  • News

    Cannibalism's DNA Trail: Gene may signal ancient prion-disease outbreaks

    Cannibalism among prehistoric humans may have left lasting genetic marks, a team of scientists contends. Their controversial argument hinges on a link between specific DNA mutations and a disease that afflicted South Pacific villagers who practiced cannibalism as late as 1950.

    Gene variations that protect against prion diseases–deadly neurological illnesses caused by proteins known as...

    04/09/2003 - 11:41 Anthropology
  • Feature

    Drama in Numbers

    As the curtain rises, an illuminated mathematical expression dominates the scene. "Do you see that theorem?" the narrator asks. "In 1637, Pierre de Fermat . . . wrote it down in the margin of a book. Then he added this tantalizing note." A spotlight suddenly reveals a bearded, bewigged, flashily dressed Fermat, who promptly sings,

    "I have discovered a truly...

    12/16/2002 - 13:38 Numbers