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http://www.sciencenews.org/view/issue/id/675
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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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July 22nd, 2000
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A new type of optical microscope, which can discern objects smaller than a supposedly fundamental limit for visible-light viewing, may make it possible to see finer details of the insides of living cells. (p. 52)
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Thanks to lucky circumstances, bird researchers find rare evidence that food, not sex appeal, makes some male and female hummingbirds look different. (p. 52)
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A metanalysis reveals right-handedness is more common among heterosexuals than homosexuals, suggesting a neurobiological basis for sexual orientation. (p. 53)
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A toxin from a bacterium that causes food poisoning appears to kill cells by interacting with a protein called Bcl-2. (p. 53)
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The central portion of Greenland's ice sheet is, on the whole, not getting any thinner, but most margins of the ice sheet are thinning substantially and contributing to rising sea levels. (p. 54)
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Genetically engineered potatoes can deliver an edible vaccine against Norwalk virus, a common diarrhea-causing pathogen. (p. 54)
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Rapid-eye-movement sleep may help consolidate some newly acquired memories, brain scans suggest. (p. 55)
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Tired of grinding their gears, micromachine researchers turn to surface science. (p. 56)
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Gene swapping muddles the history of microbes. (p. 60)
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For some elderly stars, the fountain of youth may be only a collision away. (p. 59)
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Astronomers studying the universe at millimeter-wave energies-the high-frequency portion of the radio spectrum-were given an official guarantee last month that commercial satellites and other communication devices won't interfere with the scientists' observations. (p. 59)
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Some newly recognized chemical wizardry lets some Heliconius caterpillars thrive on leaves that defend themselves with cyanide. (p. 59)
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Male blue-ringed octopuses get pretty far along in their courtship before they determine whether their partner is a female. (p. 59)
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Female wasps that found a colony together show no favoritism toward their own offspring when the adults feed larvae. (p. 59)
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Neuroligins may help brain cells form specialized links known as synapses. (p. 63)
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The rodent brain can be stimulated to replace damaged cells with new ones. (p. 63)
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Scientists have constructed an artificial thymus to make immune cells in the laboratory. (p. 63)
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A shortage of the enzyme ALDH-2, which is needed to break down alcohol in the body, causes a buildup of the cancer-linked chemical acetaldehyde, perhaps explaining why alcoholics lacking ALDH-2 have high rates of mouth and throat cancers. (p. 63)
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Scientists have identified the gene that is mutated in people who have color blindness on the Pacific island of Pingelap, perhaps paving the way for genetic screening. (p. 63)
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A heavenly deception in which dead stars lie about their ages could throw into disarray theories describing some of the densest objects in the cosmos. (p. 55)
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