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Your search has returned 26 articles:
  • News

    Extracting Estrogens: Modern treatment plants strip hormone from sewage

    Reproductive hormones, both natural and the synthetic ones in contraceptive drugs, sometimes survive sewage treatment and turn up in the environment where they can affect wildlife. Modern sewage-treatment facilities, about half of those used in Europe, break down these sex hormones more effectively than older plants do.

    A new study shows why: Only the modern, multiple-chamber treatment...

    07/30/2003 - 09:28 Earth & Environment
  • Feature

    Transplanted Hopes

    A compelling description of untreated diabetes comes from Aretaeus of Cappadocia. Writing in the second century A.D., he called the disease "a melting down of the flesh and limbs to urine."

    Despite such an early recognition of the symptoms and severity of diabetes, effective treatment proved elusive. In the late 1800s, researchers localized the problem to the pancreas, a 100-gram...

    06/16/2003 - 14:45 Biomedicine
  • Feature

    New Concerns about Phthalates

    Phthalates. Difficult to spell and harder to sound out, this class of compounds would be forgettable if the name didn't keep popping up in debates over the safety of intravenous-blood bags, food packaging, and children's toys.

    Phthalates have become ubiquitous in modern society. Some of these oily substances find use as...

    06/16/2003 - 12:59 Earth & Environment
  • News

    Super Fibers: Nanotubes make tough threads

    The superior mechanical and electrical properties of carbon nanotubes have intrigued materials scientists for a decade. But they've struggled to take advantage of the hollow tubes, just nanometers wide, for macroscopic projects.

    Now, researchers have spun the tubes into composite fibers that are tougher than steel, Kevlar, or spider silk. The new fibers appear to...

    06/11/2003 - 10:23 Materials
  • News

    Estrogen effects linger in male fish

    Estrogen-mimicking pollutants can trigger gender-bending effects in wildlife. For instance, male fish exposed to such hormonally active pollutants will make vitellogenin, an egg-yolk protein that's normally fashioned only by females (SN: 1/8/94, p. 24: http://www.sciencenews.org/sn_edpik/ls_7.htm). A new study finds that once initially spurred to make vitellogenin, males don't need a steady...

    04/08/2003 - 16:48 Earth & Environment
  • Feature

    The Case for DDT

    The pesticide DDT has a long and checkered history. Today, it evokes particularly contentious argument. Though environmentalists have come to demand this poison's elimination from the face of the Earth, some tropical-disease specialists laud DDT as an irreplaceable weapon in their fight against malaria. Which view prevails may be a life-and-death matter for nearly a half-billion people.

    ...
    01/17/2003 - 16:55 Earth & Environment
  • News

    Moms' POPs, Sons' Problems: Testicular cancer tied to a fetus' pollutant contact

    Women who've had substantial exposure to certain environmental pollutants are more likely than others to bear sons who develop testicular cancers. These findings of a new epidemiological study jibe with a current hypothesis that contact with hormonelike chemicals before birth raises a male's risk of various genital problems.

    In the United States, the testicular cancer rate climbed 67...

    01/08/2003 - 12:37 Biomedicine
  • News

    Contraceptive-Patch Worry: Disposal concern focuses on wildlife

    Lately, television commercials in Europe and the United States have shown scantily clad women sporting the latest accessory–a contraceptive patch. Impregnated with the same synthetic estrogen that's in birth-control pills, these plastic bandages are worn for a week and then tossed. Some scientists now worry that because the discards still contain plenty of the hormone, sending them down...

    10/16/2002 - 11:39 Earth & Environment
  • News

    Prize honors physicist with conscience

    Physicist Freeman J. Dyson will receive an award next month of greater monetary value than the Nobel prize.

    Yet the $948,000 Templeton prize, to be presented in a public ceremony May 16 in Washington, D.C., will not recognize Dyson, 76, for his physics research. The annual honor goes to individuals for originality in advancing religious understanding.

    Dyson has been a physics...

    10/02/2002 - 10:56 Physics
  • News

    Cloned pigs, down on the corporate farm

    Dozing on a farm in Blacksburg, Va., are Alexis, Carrel, Christa, Dotcom, and Millie, the first pigs ever cloned from the cells of an adult swine. The corporate parent of the litter is PPL Therapeutics of Edinburgh, Scotland, the same firm that funded the creation of Dolly, the cloned sheep (SN: 3/1/97, p. 132: http://www.sciencenews.org/sn_arc97/3_1_97/fob1.htm).

    Hoping to...

    09/20/2002 - 14:42