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http://www.sciencenews.org/view/issue/id/371
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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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April 15th, 2000
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New evidence supports the view that people occupied a site in coastal Virginia at least 15,000 years ago. (p. 244)
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An Institute of Medicine panel reported that dietary antioxidants such as vitamins A and E can limit cellular damage from free radicals but warned that studies in people have never adequately established a direct connection between antioxidant consumption and prevention of chronic disease. (p. 244)
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Astronomers have identified a new solar mechanism that may explain some coronal mass ejections. (p. 245)
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Up to 30 percent of a cell's proteins get recycled as soon as they roll off the cellular assembly line. (p. 245)
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Tides may sometimes be strong enough to tug Earth into an ice age. (p. 246)
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To rebuild northeastern U.S. populations of the spiny dogfish, the first fishing quotas on this species limit the harvest to roughly 10 percent of the 1998 haul. (p. 246)
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DNA interactions that bend tiny diving boards, or cantilevers, may open the door to powering micromachines by means of molecular reactions. (p. 246)
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The largest amphibian data set ever crunched—936 populations in 37 countries—confirms global declines. (p. 247)
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Some breast cancer patients without a mutation in the BRCA1 gene nevertheless have an incapacitated gene, silenced by a process called hypermethylation of nearby DNA. (p. 247)
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Can interrupting their treatment benefit HIV-infected people? (p. 248)
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When birds trill and whales woo-oo, we call it singing. Are we serious? (p. 252)
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The relatively rare brew known as white tea offers more caffeine than green tea—and perhaps more anticancer activity. (p. 251)
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The extremely toxic and reactive chemical used to inflate airbags could cause risks to human health and wildlife if accidentally released into the environment. (p. 251)
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Processing to erase the distinctive flavors and colors in cooking oils also removes or deactivates compounds that can defuse biologically damaging chemical reactions in the body. (p. 251)
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The active ingredient in the anticancer drug taxol has turned up in hazelnuts and fungi. (p. 251)
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Aroma chemists have discovered a carotenoid-processing enzyme that makes the chemicals that give rose oil its smell. (p. 255)
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Scientists have discovered a gene in German cockroaches that may lead to a new type of insect control—contraception for male cockroaches. (p. 255)
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Taste researchers have narrowed the search for the sweet tooth gene, at least in mice, to a 100-gene region. (p. 255)
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A new way to produce mysterious quantum correlations among particles ups the record to four particles linked, or entangled, and opens the door to correlating many more particles on cue, a prerequisite for making quantum computers. (p. 255)
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Physicist-author Freeman J. Dyson received the Templeton prize for originality in advancing religious understanding. (p. 255)
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