scientific american - 1998 12 - animal or vegetable

... 5-androstenediol, 1 9-4 -norandrostenedione and 1 9-5 -norandrostene- diol. (The Merck Index classifies 5-androstenediol and 1 9-5 -norandrostenediol as anabolic steroids.) The argument about whether such nonprescrip- tion ... and Human Rights Watch World Report, 1998, Hu- man Rights Watch, New York, 1997. Data from all three organizations are for 1997. RODGER DOYLE Copyright 1998 Sc...

Ngày tải lên: 12/05/2014, 15:50

... quite diÝer- ent kind of neutrino detectorÑthe So- viet -American Gallium Experi- ment, or SAGEÑbegan opera- tion below Mount Andyrchi in the Russian Caucasus. SAGE incorporates a 60-ton tank of liquid ... tumor cell might suÝer 12, or perhaps 15, repeti- tions. Perucho speculated that patients with such tumors might have a Òmuta- tor mutationÓÑone that introduces er- rors when DNA is r...

Ngày tải lên: 12/05/2014, 14:50

... long-dead Native Americans or fossils of even longer- dead hominid ancestors. In a matter of hours these ancient objects are trans- formed into data Þles that can be stored on a CD-ROM or restored into ... can browse through in- formation from all over the world; Mo- saic Communications Corporation has announced a version that can encrypt commercial information such as a cred- it-card num...

Ngày tải lên: 12/05/2014, 14:59

... behavior. The gene that caus- es Lesch-Nyhan syndrome, which often involves self-mutilation, is one. Anoth- er is a variant gene for the thyroid hor- mone receptor, which can lead to at- tention-deÞcit ... certify that all in- formation furnished above is true and complete. I un- derstand that anyone who furnishes false or mislead- ing information on this form or who omits material or i...

Ngày tải lên: 12/05/2014, 15:03

... easier-to-use work- stations based on off-the-shelf proces- sors increased in power, fewer buyers were willing to pay for relatively com- plex supercomputers based on custom News and Analysis40 Scientific ... false or misleading information on this form or who omits material or information re- quested on the form may be subject to criminal sanc- tions (including fines and imprisonment...

Ngày tải lên: 12/05/2014, 15:18

... periodic orbits in a spherical cav- ity are just the trajectories that the par- ticles can take: they shoot back and forth along a diameter or follow around var- ious polygons with three or more cor- ners. ... normal metabol- ic end points such as carbon dioxide and salts. (That would mark a distinct change in phy- toremediation efforts: for ex- ample, in heavy-metal extrac- tion plants s...

Ngày tải lên: 12/05/2014, 15:32

... silicon-germanium-carbon technol- ogy developed at France’s Institute of Fundamental Electronics (IEF) for op- toelectronic applications. The Semicon- ductor Research Corporation, a con- sortium ... arti - cially for the sole purpose of storing or- gans for harvesting and transplanta- tion. At about the zenith of surreality, a former director of the National Institutes of Health reported...

Ngày tải lên: 12/05/2014, 15:33

... presents for the world from the frozen North. —W. Wayt Gibbs in San Francisco News and Analysis34 Scientific American February 1998 NATURAL-BORN GUINEA PIGS A start-up discovers genes for tremor and ... ener- gy from the sound wave. Still, the reso- nator has generated enough sonic power to interest a major appliance manufac- turer, which has a license to incorporate the resonator as...

Ngày tải lên: 12/05/2014, 15:33

... Crisis S PECIAL R EPORT: THE END OF CHEAP OIL Copyright 1998 Scientific American, Inc. M anufacturers of the ma- chine tools that make the parts for a Ford Explorer or a Honda Accord still often ... possible to de- The Bose-Einstein Condensate40 Scientific American March 1998 The Bose-Einstein Condensate Three years ago in a Colorado laboratory, scientists realized a long-stan...

Ngày tải lên: 12/05/2014, 15:34

... either ana- lyze the rocks there more thoroughly than Viking did or bring samples back.” —W. Wayt Gibbs in San Francisco Copyright 1998 Scientific American, Inc.Copyright 1998 Scientific American, ... Berke- ley Laboratory used a particle accelera- tor to create them. In 1995 scientists at CERN, the European laboratory for particle physics near Geneva, synthe- sized atoms of anti...

Ngày tải lên: 12/05/2014, 15:35