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http://www.sciencenews.org/view/issue/id/9154
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In the December 5 Issue:
- TABLE OF CONTENTS
- Climate might be right for a deal: Copenhagen negotiations will take steps toward a climate-stabilizing treaty
- Botanical Whales: Adventures in the Tortugas reveal that seagrass fields need saving too
- Breaking the Speed Limit: Studies examine physiology and technology to better foresee the ultimate edge of human performance
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December 1st, 2007
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The Venus Express probe has found evidence that Venus once had more water than it does today, and has provided new measurements of the weather on Venus, proof of lightning on the planet, and signs of a formerly unknown hot spot near its south pole. (p. 339)
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A single population of prehistoric Siberians crossed the Bering Strait into Alaska and fanned out to North and South America, a new genetic analysis of living Native Americans suggests. (p. 339)
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A gene that can hold off the decrepitude of old age in plants offers an unusual approach to protecting crops from drought. (p. 340)
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Diminished bone density in elderly people contributes to fractures following traumatic accidents. (p. 340)
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North America's vegetation soaks up millions of tons of carbon dioxide from the atmosphere each year, an impressive rate of sequestration that still can't keep up with the prodigious emissions of the planet-warming gas generated by human activity on the continent. (p. 341)
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The first precise measurements of DNA's sideways conductivity confirm its similarities with semiconductors. (p. 342)
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By slowly unraveling a protein, scientists have shown how other proteins called chaperones influence protein folding. (p. 342)
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Scientists are refining carbon dating techniques to make the archaeological timeline more precise. (p. 344)
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The plight of polar bears may get most of the attention as climate change disrupts the Arctic ice, but plenty of other species, from walrus and seals to one-celled specks, are also going to see their world change radically. (p. 346)
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Newly unearthed fossils of a 9.8-million-year-old ape in eastern Africa come from a creature that may have evolved into a common ancestor of African apes and humans. (p. 349)
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A new brain-scan investigation indicates that attention-deficit hyperactivity disorder involves substantial delays in children's brain development. (p. 349)
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A new bioreactor produces hydrogen hundreds of times as fast as previous prototypes. (p. 349)
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Common food colorings and the preservative sodium benzoate have the potential to foster hyperactivity and inattentiveness in children, a new study finds. (p. 349)
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A patch worn on the skin delivers a vaccine against a form of Escherichia coli that causes traveler's diarrhea. (p. 350)
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A skin infection in people living on the Pacific island of Satowan stems from swimming in ponds formed from World War II bomb craters there. (p. 350)
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The first oral drug for sleeping sickness is showing effectiveness in a trial in central Africa. (p. 350)
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Scientists have discovered that 12 units of blood donated in Puerto Rico in late 2005 contained the dengue virus. (p. 350)
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(p. 351)
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