Vol. 161 No. #15
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More Stories from the April 13, 2002 issue

  1. Agriculture

    Journal disowns transgene report

    The journal Nature now says it shouldn't have published a report that genetically engineered corn is leaking exotic genes into the traditional maize crops of Mexico.

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  2. Humans

    Web site debuts on junior high science

    A new Web site reviews the accuracy of commonly used middle school physical science books and offers tips and assistance for teachers working from those texts.

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  3. Immune cells carry concealed weapons

    Scientists propose that protein-cleaving enzymes called proteases are the real microbe destroyers in bacteria-killing cells called neutrophils.

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  4. Health & Medicine

    Pulse pressure linked to dialysis death rate

    People on kidney dialysis who have high pulse pressure—the difference between the top and bottom numbers on a blood pressure reading—seem to be at a greater risk of dying than those with low pulse pressure.

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  5. Plants

    Trees dim the light on spring flowers

    Early spring flowers and the sugar maples they grow under use different alarm clocks to get going in the spring, which can make life hard for the flowers in northern forests.

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  6. Health & Medicine

    Diluted smallpox vaccine is potent

    About 15 million doses of smallpox vaccine held by the U.S. government can be diluted to one-tenth their original concentration and still be effective for immunizing people.

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  7. Earth

    Do your bit to fight toxic pool pollution

    New data suggest that showering before a swim in the community pool could help limit the formation of toxic chemicals in the water.

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  8. Health & Medicine

    Vanquishing a Virus: New drugs attack herpes infections

    Scientists have identified a new class of compounds that stop herpes simplex virus from replicating.

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  9. Anthropology

    The DNA Divide: Chimps, people differ in brain’s gene activity

    The distinctive looks and thinking styles of people and chimpanzees derive from the contrasting productivities of their similar DNA sequences.

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  10. Astronomy

    Gamma-Ray Burst: A black hole is born

    New evidence supports the notion that gamma-ray bursts, the most violent explosions in the universe, are the primal calling cards of newborn black holes.

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  11. Materials Science

    Steely Glaze: Layered electrolytes control corrosion

    Experiments with ultrathin organic coatings applied to steel suggest a new technique for slowing corrosion.

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  12. Physics

    Molding Atoms: Using a tiny template to make tinier structures

    With the help of a molecular mold composed of exactly 188 atoms, researchers have been able to impose textures at an even smaller atomic scale on a metal surface.

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  13. Animals

    Toxic Tools: Frogs down under pack their own poison

    An Australian frog can synthesize its own protective poison, rather than obtain it from the insects it eats.

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  14. Globin Family Grows: Blood-protein relative is in all tissues

    Researchers discovered a relative of the blood protein hemoglobin in all the body's tissues.

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  15. Ecosystems

    Climate Upsets: Big model predicts many new neighbors

    The biggest effects of climate change during the next 50 years may not be extinctions but major reshuffling of the species in local communities.

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  16. Chemistry

    The True Sweet Science

    New techniques and tools are helping scientists elucidate the roles that complex sugars play in the human body and in drug manufacturing.

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  17. Earth

    Stemming the Tide

    New approaches to stopping the introduction by ships of invasive species to North American waters are beginning to show promise but have a long way to go.

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