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http://www.sciencenews.org/view/issue/id/4720
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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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February 14th, 2004
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Scientists have for the first time carried test-tube cloning of a human embryo to the stage at which it can yield stem cells. (p. 99)
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By harnessing the self-assembling properties of DNA, researchers coerced a single strand of the genetic material to assume the shape of an octahedron. (p. 99)
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New analyses of a fossil suggest that winged insects may have emerged as early as 400 million years ago. (p. 100)
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Blood concentrations of two proteins that affect blood vessel growth appear to foretell the pregnancy condition known as preeclampsia. (p. 100)
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In separate studies, researchers have gathered the first systematic evidence showing that baboons and chimpanzees regularly use caves, a behavior many anthropologists have attributed only to people and our direct ancestors. (p. 101)
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A South American bee that ignores flowers and collects carrion from carcasses has an unexpected taste for live, abandoned wasp young. (p. 101)
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Squashed or stretched versions of spheres snuggle together more tightly than randomly packed spheres do. (p. 102)
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Birds that hide and recover thousands of separate caches of seeds have become a model for investigating how animals' minds work. (p. 103)
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Chemical tags applied to proteins that DNA wraps around regulate genetic activity. (p. 106)
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Researchers are learning how to adapt sophisticated technologies to meet the health-care needs of the developing world. (p. 108)
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A newly identified bacterial protein generates the sinuous shapes of some bacteria. (p. 109)
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Blasted by the heat and radiation from its parent star, a planet 150 light-years from Earth is literally blowing off its atmosphere. (p. 109)
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A part of the brain that's involved in sound processing shows pronounced activity when rhesus monkeys hear their comrades vocalizing but not when the same animals hear other sounds. (p. 109)
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Human metapneumovirus, first isolated in 2001, is present in many respiratory infections that had previously gone unexplained. (p. 109)
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The blind mole rat is the first animal discovered to navigate by combining dead reckoning with a magnetic compass. (p. 110)
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Analyses of sediment and water samples taken from an arctic lake indicate that an ancient whaling community left a mark on the lake’s ecosystem that persists today, even though the settlement was abandoned more than 400 years ago. (p. 110)
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A new radiocarbon analysis indicates that a skeleton found more than a century ago in an Italian cave dates to around 26,400 to 23,200 years ago. (p. 110)
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(p. 111)
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