scientific american - 1999 11 - up, up and far away

... 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 ... Pavonis Mons by balloon NOVEMBER 1999 $4.95 www.sciam.com SLAVES, QUEENS AND CHEMISTRY • VISION AND CONSCIOUSNESS Up, Up and Far Away • Exploring Mars by Balloon • H...

Ngày tải lên: 12/05/2014, 15:59

... dietary-supplement industry would pay for safety and efficacy trials. But the industry quakes at sugges- tions that it be held to pharmaceutical- level standards. The Dietary Supple- ment Health and ... Francisco News and Analysis34 Scientific American February 1998 NATURAL-BORN GUINEA PIGS A start -up discovers genes for tremor and psoriasis in the DNA of inbred Icelanders GENOM...

Ngày tải lên: 12/05/2014, 15:33

... OBSERVATORY Wolf-Rayet 104 News and Analysis20 Scientific American June 1999 L unar Prospector is not an impres- sive-looking spacecraft. Shaped like a soup can with its ends cut off, the 295-kilogram (650-pound) orbiter ... brain and to distin- guish white and gray matter there; xe- non passes across the blood-brain bar- rier (producing anesthesia and eupho- ria). Even though x...

Ngày tải lên: 12/05/2014, 15:57

... 2003 SCIENTIFIC AMERICAN, INC. NOVEMBER 2003 W ith its multiple dams, flood-con- trol mechanisms and crop-irri- gating structures, the Rio Grande has provided residents of Col- orado, New Mexico and ... Planetary Society, a space-interest group, and the entertain- ment media firm Cosmos Studios [see “Sailing on Sunlight,” News Scan, Sci- entific American, July 2001]. Both or- ganizatio...

Ngày tải lên: 12/05/2014, 16:18

... observed. 32 SCIENTIFIC AMERICAN March 1993 NATIONAL OPTICAL ASTRONOMY OBSERVATORIES Copyright 1993 Scientific American, Inc. known as up and down. Other ßavorsÑ strange, charm and bottomÑcan be pro- duced ... the ediÞce. A supreme the- orist and experimentalist, he recast chemistry in the mold of quantum me- chanics and pioneered techniques such as x-ray and electron diÝra...

Ngày tải lên: 12/05/2014, 14:49

... tobacco smoking, and so 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 ... recently been recog- nized and is associated with the view- point of ecological, or steady-state, eco- nomics. It means that the input of raw materials and energy to an...

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 2 SUBGROUP ... proteins 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 int...

Ngày tải lên: 12/05/2014, 14:59

... 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...

Ngày tải lên: 12/05/2014, 15:02

... togeth- er,” he says. These clustered voices be- longed to major movers and shakers, such as then President George Bush and then candidate Clinton, and mega- celebrities Barbra Streisand and Elizabeth Taylor. ... 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 sha...

Ngày tải lên: 12/05/2014, 15:16

... intestines, 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 ... privacy regula- tion to industry and consumer groups, to let security standards and manage- ment be driven by market forces, to ad- dress Internet copyright protection is- sues, an...

Ngày tải lên: 12/05/2014, 15:31