scientific american - 1999 01 - revolution in cosmology

... chem- istry of life while fending off attacks from soil-dwelling, non-car- bon-based organisms. The key was active watching —stopping the videotape and discussing the concepts; in this way, a single episode ... nonprofit or- ganization based in Pasade- na, Calif., a project called SETI@home. This venture in- vites the public to join in the search for extraterrestrial in- telligence....

Ngày tải lên: 12/05/2014, 15:51

... stream. $500.00 $100.00 $50.00 $100.00 $500.00 $400.00 $450.00 $350.00 DEPOSIT CHECK#314 DEPOSIT CHECK#315 4/5/94 4/26/94 4/27/94 11/3/94 011 111000000 0010 1010 1000000 0010 00 0011 1 1011 10BITSTREAM: UNINTENDED 5-BIT KEY (VALUE OF 011 11=15) INTENDED 4-BIT KEY (VALUE OF 011 1=7) UNINTENDED 15-BIT DATA BYTE INTENDED 7-BIT DATA BYTES LAURIE ... discarded. (In extreme cases, transla- tio...

Ngày tải lên: 12/05/2014, 15:00

... tumor proteins.Inject- ed into the patients,the proteins pro- voked an immune response;18 of 20 pa- tients remain in remission four years af- ter being vaccinated.Unlike previous vaccine trials,this ... stress). The Au- gust 1999 Izmit rupture (light blue line) occurred in a zone of increased stress. Copyright 1999 Scientific American, Inc. I t all began in the “Letters to the Ed...

Ngày tải lên: 12/05/2014, 16:00

... 4,650 4,400 12-BILLION-YEAR- OLD AGE TRACK 15-BILLION-YEAR- OLD AGE TRACK NGC 288 NGC 362 Copyright 1992 Scientific American, Inc. means that within the halo the only re- maining main-sequence stars ... Inc. case, it was my good chance.Ó Levi-Mon- talcini and her family left Turin in 1942 for the surrounding hills and success- fully survived the war in hiding. By con- vincing farmers t...

Ngày tải lên: 12/05/2014, 14:48

... supplementary insulin injections, the cyclosporine ther- apy was stoppedÑbut the implants con- tinued to function. Some are still churn- ing out insulin more than a year after in- jection. Soon-Shiong ... example, the receptor proteins for the interleukin-3 and interleukin-5 cytokines share the same beta-chain subunit. 34 SCIENTIFIC AMERICAN June 1993 David’s Victory Gene causing “bubbl...

Ngày tải lên: 12/05/2014, 14:49

... of low doses in drinking water is suspected of contributing to a high rate of human liver cancer in cer- tain parts of China. Copyright 1994 Scientific American, Inc. This Þnding, in turn, raised ... blow or a tooth- ache. HighÞeld and Car- ter note that before the breakup of EinsteinÕs Þrst marriage, the young phys- icist lived with Elsa Ein- stein, a cousin, in Berlin, leaving hi...

Ngày tải lên: 12/05/2014, 14:50

... assassins allegedly planted gamma-ray-emitting pellets in the office of a Moscow businessman, kill- ing him within months. At least half a dozen similar in- cidents have been reported in Russia since ... synthesis Slows age-related increases in: Cross-linking of long-lived proteins; free-radical production by mitochondria; unrepaired oxidative damage to tissues Delays onset of late-li...

Ngày tải lên: 12/05/2014, 15:04

... But as the dopamine-pro- ducing neurons die, the resulting de- cline in dopamine signaling disrupts the smooth functioning of the overall mo- tor network and compromises the per- son’s activity. ... years old, but new evidence reported in Na- ture hints that life on the earth in fact be- gan 300 million years earlier. Burrowing into 3.8-billion-year-old rock in Green- land, scientists...

Ngày tải lên: 12/05/2014, 15:20

... undermine the out- of-Africa model by suggesting that some genes have non-African origins. Univer- sity of Oxford geneticist Rosalind M. Harding studies variation in the beta- globin gene, certain ... levels of GCs inter- act with insulin to increase food intake and redistribute energy stores in the body. “The results may be very clinical- ly relevant because sustained respon- siveness of...

Ngày tải lên: 12/05/2014, 15:33

... College (inset) Copyright 1999 Scientific American, Inc. F ire ants, aptly named for their burning stings, have long been an infernal pest in the southern U.S., destroying crops, displacing other insects and ... Chaos for International Business RODGER DOYLE Copyright 1999 Scientific American, Inc. herpetologist at South- ern Illinois University who has tracked sever- al frog colla...

Ngày tải lên: 12/05/2014, 15:53