scientific american - 2001 10 - beyond the zone

... produce therapeutic pro- teins. McCormick thinks that the single-chain anti- bodies can be adapted easily to one-size-fits-all thera- pies, perhaps against cancers of the pancreas, colon and other ... incorporates the three-dimension- al shape of a tire. They presented their work on August 27 at the Internoise 2001 meeting in the Hague, the Netherlands. —Alison McCook 0.0003 9 1...

Ngày tải lên: 12/05/2014, 16:10

... Molecule OXYGEN Copyright 2001 Scientific American, Inc. Scientific American March 2001 19www.sciam.com News & Analysis R ENO, NEV. The Chicxulub Cra- ter, sprawled across the Gulf of Mexico and the Yucatán Penin- sula, ... an approximately 18 0- kilometer-wide remnant of the impact of a 1 0- kilometer-wide meteorite. It has been called the smoking gun in the extinc...

Ngày tải lên: 12/05/2014, 16:08

... 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

... all the vehicles on the road, the emissions-control equip- ment was either removed by the own- er or damaged by the use of leaded fu- els. The latter problem has abated in recent years as the ... cells incorpo- rated the HS-tk gene, whereas virtually no normal cells did. When they then gave the rats ganciclovir, they got an- other pleasant surprise. The drug killed not onl...

Ngày tải lên: 12/05/2014, 14:50

... is a prime success of the big bang cosmology. GALAXY 3C 382 REDSHIFT 0.06 GALAXY 3C 330 REDSHIFT 0.50 DENSITY 0 .10. 01 RELATIVE ABUNDANCE 1.0 1.0 10 -2 10 -4 10 -6 10 -8 10 -1 0 HELIUM HELIUM 3 LITHIUM DEUTERIUM Copyright ... from each other by their length. En- zymes snip the markers from the longer strands of DNA within which they are embedded; markers of dif...

Ngày tải lên: 12/05/2014, 14:58

... value. Scien- tists have identified fewer than 1 percent of the fauna that thrive in the park’s 10, 000 thermal sites. Diver- sa gets the rights to any discoveries and products from them, and the park shares ... 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 len...

Ngày tải lên: 12/05/2014, 15:30

... archaeologists tell layers apart by playing a game of which-stars- are-not-like -the- others. The sun and most other stars swirl around the galactic center within a thin circular disk. Nearly a ... makes peo- ple ask more questions.” —Kate Wong NEW ENTRY into the hominid ranks 30 SCIENTIFIC AMERICAN JUNE 2001 Copyright 2001 Scientific American, Inc. 32 SCIENTIFIC AMERICAN...

Ngày tải lên: 12/05/2014, 16:08

... Copyright 2001 Scientific American, Inc.Copyright 2001 Scientific American, Inc. or Life By Rakesh K. Jain and Peter F. Carmeliet Copyright 2001 Scientific American, Inc.Copyright 2001 Scientific American, ... Scientific American, Inc. 36 SCIENTIFIC AMERICAN DECEMBER 2001 BETTMANN/CORBIS Profile of the most-talked-about environmental issues of the 20th century...

Ngày tải lên: 12/05/2014, 16:11

... prevent mother-to-child transmis- sion, two months after treatment. Neverthe- less, the benefits of these drugs clearly out- weigh the possibility of resistance, says Lynn Morris of the National ... single fat- ty-acid-producing gene called SCD-1 gorged on high-fat, sucrose-rich diets without packing on the pounds or sending their blood into a diabetes-in- ducing sugar rush. Instead th...

Ngày tải lên: 12/05/2014, 16:14

... after they have passed through the cavity. The red laser beam traces the line of the in- frared laser used to excite the atoms; the blue beam marks the path of the atoms themselves. When in use, the ... stable, the high birth rates of the baby boom postponed the aging of the population by widen- ing the base of the age structure again. As the baby boomers grow...

Ngày tải lên: 12/05/2014, 14:49