scientific american - 1998 11 - greenland''s mysterious meteor - fire over the ice

... one of those Tranquilli- ty-base-here -the- Eagle-has-landed, NASA-flight-control jubilation scenes. Laima is the Latvian goddess of good fortune, and the name was a homage to the heritage of Juris ... first time. The heat is daunting. As the after- noon wears on, the debate between Johnson and Fiedel moves first one way, then the other, like a tug-of-war. The debate might never...

Ngày tải lên: 12/05/2014, 15:48

... la Mare of the Austra- lian Antarctic Division of the Department of the Environment, Sport and Territories has found that be- tween the mid-1950s and the early 1970s the sea ice edge in the Antarctic most ... successive- ly, echoes from the waves map the fea- tures of an oil field over time. Oil com- panies then plug the seismic data into the software. Tapping those s...

Ngày tải lên: 12/05/2014, 15:31

... in which the disease was inher- ited along with the section of chromo- 28 SCIENTIFIC AMERICAN November 1993 cause damage or whether blame belongs to the chemicals they carry deep into the lungs. Many ... growth), they do so at the expense of labor in the high-wage coun- tries. They thereby increase income in- equality there. Most citizens are wage earners. In the U.S., 80 pe...

Ngày tải lên: 12/05/2014, 14:50

... MOVE TO THE SAME LOCATION IN THE 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 ... 54]. The bottom of the bowl rep- resents the energy minimum. The posi- tion of the ball corresponds to the val- ue of the scalar Þeld. Of course, the equations describ...

Ngày tải lên: 12/05/2014, 14:59

... conclusion. De- spite the hype surround- ing the Þeld, the experts wrote, Òthere is a substan- tial gap between the tech- nology that is available and the technology that is needed to realize the po- tential ... loners. The families have very diÝerent char- acters, which reßect the person- ality of the matriarch. In the case of Echo, the family is low- key and nonaggress...

Ngày tải lên: 12/05/2014, 14:59

... Þnding the genes will help scientists uncover the biochemistry of manic-depression. ÒThere are a lot of theories about neurotransmitters, but at the end of the day, when they Þnd the genes, theyÕre ... as scripting. These simple programming languages can make use of the capabil- ities of the applications in which they are embedded: a word-processing mac- ro, for example, might u...

Ngày tải lên: 12/05/2014, 15:02

... and Analysis Scientific American October 1996 37 Copyright 1996 Scientific American, Inc. E uropean governments are dis- covering the Internet, and they aren’t too sure they like it. The Net is ... that there are more of them available to de- stroy the cancerous cells; these white blood cells could then be put back in- side the body to reproduce and to battle the tumor. Furth...

Ngày tải lên: 12/05/2014, 15:15

... risk factors may affect the expres- sion of the disorder,” the group con- cludes in the Journal of the American Medical Association. The lead author of the study, the larg- est of its kind ever ... psychology at the University of Liverpool, and other academics have ruffled a few well-groomed feathers in the staid linguis- tics community. Their gos- sip-grooming hypothesis...

Ngày tải lên: 12/05/2014, 15:16

... de- mand for their services is surg- ing thanks to long-distance price wars and burgeoning Internet use. But many firms were caught off guard by the run on bandwidth. The trunks of their - ber-optic ... Brynjolfs- son’s model, the more the information- rich accelerate away from the informa- tion-poor (the assumption is that infor- mation-haves will generally prefer to hobnob with...

Ngày tải lên: 12/05/2014, 15:20

... of a tiny needle. They also tested the glucose levels in these volunteers by the finger-stick method. They found that both the skin-fluid sample and the fin- ger-stick measured the correct glucose levels ... outside the cell and the other inside. The component outside the cell is the extracellu- lar matrix; the compressive “girders” inside the cell can be ei- ther micr...

Ngày tải lên: 12/05/2014, 15:33