scientific american - 1997 05 - the 100 - year weather forecast

... preda- tors. Once the cubs can move, though, the mothers bring them out into the open to join the rest of the pride. If any of the other females have cubs, they form a crèche and remain in near-con- stant ... offered to them, some home owners will balk at the idea of selling their excess electricity at a dis- count to the local utility, which then re- sells the power for sev...

Ngày tải lên: 12/05/2014, 15:23

... Among the most com- mon mines in this group are the Italian scatterable mines TS-50 and SB-33 and the hand-laid VS-50 and VAR-40, the U.S made M14, and the Chinese Type 72. Typically, these weapons ... Space Adminis- tration unveiled the X-36 the first high-performance jet with no tail at all. Remotely controlled and powered by a cruise-mis- sile engine, the 5.4-meter-long, 600-...

Ngày tải lên: 12/05/2014, 15:08

... polydiacety- lene film, which happens to be blue. But the binding of E. coli toxin to the other part of the molecule (the cell-surface re- ceptor) breaks the links joining the lip- ids to one another, ... the way from the sun’s in- terior to the earth and out to the farthest reaches of the solar wind. Some of its in- struments are now poised to resolve sev- eral other myst...

Ngày tải lên: 12/05/2014, 15:21

... of bird-watchers, and they love the birds. And after they watch them, they go home and put up their bug zappers. These birds, even the seed eaters, are feeding heavily on insects when they’re ... CRAWFORD Copyright 1997 Scientific American, Inc. News and Analysis Scientific American June 1997 31 But the videotapes revealed that dis- satisfied females rarely assume the prop-...

Ngày tải lên: 12/05/2014, 15:26

... disrupting the signals between neurons. COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. 28 SCIENTIFIC AMERICAN MAY 2004 I n the 18 years since they were dis- covered, high-temperature supercon- ductors ... what remains of the mess left by the Exxon Valdez. The oil compo- nents are poisoning the otters. COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. www.sciam.com SCIENTIFIC AMERIC...

Ngày tải lên: 12/05/2014, 16:20

... inhibit candor when they are posed the ques- tion, ÒHow big is the diÝerence?Ó (Fur- ther, the work has not yet been peer-re- viewed or published, so the team re- mains quite cautious about the details.) Essentially ... DNA, the ruthenium-ribose combination revealed something extraordinary. The researchers examined the electri- cal properties of short lengths of dou- ble-helix...

Ngày tải lên: 12/05/2014, 15:01

... Copyright 1997 Scientific American, Inc. News and Analysis32 Scientific American October 1997 So last summer the group experiment- ed with the two structures, first on computer models, then on the real ... Bal- asubramanian. Last year, while chatting in the car on the way home from a con- ference, Regan suggested that two pro- teins being studied in the lab might just...

Ngày tải lên: 12/05/2014, 15:30

... Within the U.S. there is a wide variation in the status of fish, with the southern half of the country having far more imper- iled species than the northern half; the large map below shows the number ... which they originally resid- ed. Instead they flow rather freely be- tween the atoms and are said to be de- localized. But they stay in or around the cluster because they ar...

Ngày tải lên: 12/05/2014, 15:32

... Biológica of Doñana-CSIC. At night, the animals leave the safety of the scrubs to hunt on the open lands and find themselves at the mercy of hounds unleashed by the poach- ers during their nocturnal ... badgers belonged to the five territories in Coto del Rey; the others resided within the core of the park, Reserve Biológica. Of the tagged bad- gers, the team recorded 13...

Ngày tải lên: 12/05/2014, 16:08

... CELSIUS) 4,9 005, 150 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 ... declines as the reefs get farther away from two centersÑone in the Indo-Pa- ciÞc and the other in the Caribbean. The outlines of a map marking plum- metin...

Ngày tải lên: 12/05/2014, 14:48