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http://www.sciencenews.org/view/issue/id/5667
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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 4th, 2004
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Prolonged stress can cause cells to age faster than normal. (p. 355)
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Researchers have identified a compound made by the senior workers in a honeybee colony that prolongs the time that teenage bees stay home babysitting. (p. 355)
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A drug tested in mice prevents gallstones by stimulating a gene that controls levels of different chemicals in the gallbladder. (p. 356)
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The discovery of a 4,200-year-old farming settlement in Uruguay challenges traditional notions of where early South American societies took root. (p. 356)
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A photograph from Earth orbit of an immense plume of snow wafting from Mount Everest could shed new light on how strong winds redistribute precipitation in the Himalayas and other mountain chains. (p. 358)
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A protein called Nrf2 defends against emphysema by activating dozens of genes that combat free radicals and toxic pollutants, a study in mice suggests. (p. 358)
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Scientists are using a small piece of DNA as a molecular bar code, a unique identifier to separate organisms into species. (p. 360)
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Researchers are helping to turn the art of generating randomness into a precise science. (p. 362)
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Airborne soot and other pollutant particles can impair the ability of tiny vessels in the body to properly regulate blood flow, an animal study finds. (p. 365)
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Circadian-clock genes may play an important role in governing the body's metabolism of dietary sugars and fats. (p. 365)
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Detailed analyses of large earthquakes suggest that some of them may have been triggered by strong tides in Earth's crust. (p. 365)
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Preventive treatment with inexpensive drugs decreases rainy-season cases of malaria in Senegal. (p. 366)
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Researchers have discovered an enzyme that is indispensable to the parasite that causes sleeping sickness, and disabling that enzyme could offer a novel treatment strategy for the disease. (p. 366)
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Hundreds of U.S. soldiers serving in Iraq and Afghanistan have contracted leishmaniasis, a parasite-borne disease that attacks the skin. (p. 366)
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A vaccine for cholera has proved up to 81 percent effective in a large-scale public health trial in Mozambique. (p. 366)
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(p. 367)
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