scientific american - 2002 11 - when stars collide

... COMMON IN CERTAIN GALACTIC NEIGHBORHOODS BY MICHAEL SHARA WHEN STARS COPYRIGHT 2002 SCIENTIFIC AMERICAN, INC. COPYRIGHT 2002 SCIENTIFIC AMERICAN, INC. might well be the most dramatic. If the incoming ... earth is imaged, showing a magnetic- field disturbance (concentric rings) in the mantle. COPYRIGHT 2002 SCIENTIFIC AMERICAN, INC. 26 SCIENTIFIC AMERICAN NOVEMBER 2002...

Ngày tải lên: 12/05/2014, 16:14

... did not warrant reme- dial legislation or regulatory action. 24 SCIENTIFIC AMERICAN November 1993 COPYRIGHT 1993 SCIENTIFIC AMERICAN, INC. But the Six Cities Study directly ad- dressed such factors. ... fea- tures, he resembles a high- tech Buddha. Minsky is unable, or unwil- ling, to inhabit any emotion for long. Early on, as predict- ed, he plays the curmud- geon. His only rival in g...

Ngày tải lên: 12/05/2014, 14:50

... GEL SEROGROUP A Neisseria meningitidis III-1 I-1 I-2 I-3 I-4 I-5 I-6 I-7 I-8 I-9 II-1 II-2 II-3 II-4 III-2 III-3 III-4 IV-1 IV-2 IV-3 IV-4 CLONES SUBGROUP 4 SUBGROUP 1 SUBGROUP ... and mem- brane-bound lipooligosaccharides com- mon to N. lactamica and N. meningi- tidisÑmay confer immunity. This mechanism of immunity could explain the Þve- to 12-year intervals be- tween ... BI...

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... capabil- ities of the applications in which they are embedded: a word-processing mac- ro, for example, might use the search- and-replace function in conjunction with the word-counting command to ad- just ... GOLTZ Copyright 1995 Scientific American, Inc. ond, but at the higher latitudes now being monitored, its speed changes abruptly to 750 kilo- meters per second. The bound- ary between t...

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... the executive order’s “state-of-the-art” tech- nology exemption to the bulk declassi - cation rule. But that introduces another concern. “The issue is, what does state- of-the-art technology mean?” ... ener- gy constantly to the balls, allowing rip- ples and other features to form at the surface. Different patterns form as the vibra- tion is varied. When the powder is shak- en at about t...

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... and dracun- culiasis (guinea worm), in which ingested larvae mature inter- nally and eventually burst through the skin. Water-related ill- nesses are also spread through food, hand-to-mouth contact or ... form a connection. OIL IN 4-D Time-lapse software boosts oil recovery APPLIED GEOLOGY COURTESY OF JEAN-CLAUDE BRADLEY Copyright 1997 Scientific American, Inc. VIRUS-KILLING NETWORKS • PR...

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... hours after they last heard from it, they reenacted one of those Tranquilli- ty-base-here-the-Eagle-has-landed, NASA-flight-control jubilation scenes. Laima is the Latvian goddess of good fortune, ... interested in them for use in bal- listic-missile intercep- tors; a space-based pro- jectile of less than a kilogram could acceler- News and Analysis50 Scientific American November 1998 DARP...

Ngày tải lên: 12/05/2014, 15:48

... being per- formed by Monsanto —often with ad- miring publicity. In December, an up- roar swept India when rumors cir- culated that Mon- santo had insert- ed a “terminator” gene in its trans- genic ... Agency Start fidgeting Copyright 1999 Scientific American, Inc. News and Analysis28 Scientific American March 1999 W hen dozens of rotting, headless, three-quarter-ton walrus carcasses s...

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... zero-g-simulating “Vomit Comet” FIELD NOTES RICHARD SHUNNARAH Copyright 1999 Scientific American, Inc. News and Analysis 28 Scientific American November 1999 Neural Fountain of Youth Age-related ... ex- periment in the intermittently weight- less cargo bay of the National Aeronau- tics and Space Administration’s gravity- beating KC-135A aircraft. The airplane, a military version of Bo...

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... H c-ARI PCNA/Gadd45 Karp1 P44 P50 P45 P43 1 4-3 -3 o C11b P42 P17 P17 P16 P33 P24 P29 P41 p300 P47 P32 P5 P31 News & Analysis Copyright 2000 Scientific American, Inc. E galitarian democracy made a spectacular American debut in 1828, when ... devices communi- cate through a house-wide wireless net. A radio-locating system can pinpoint any tagged object to within 10 feet. The two-...

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