scientific american - 2003 03 - dinosaur feathers

... COPYRIGHT 2 003 SCIENTIFIC AMERICAN, INC. 36 SCIENTIFIC AMERICAN MARCH 2 003 INTERNATIONAL CENTER FOR NEUROLOGICAL RESTORATION (CIREN) news SCAN I n its hard-currency-based health econo- my, Cuba ... simpsoni. COPYRIGHT 2 003 SCIENTIFIC AMERICAN, INC. 30 SCIENTIFIC AMERICAN MARCH 2 003 DOUG M. BOYER University of Michigan at Ann Arbor news SCAN unlike euprimates, t...

Ngày tải lên: 12/05/2014, 16:16

... is also a con- sequence of the bending of light. . Copyright 1993 Scientific American, Inc. SCIENTIFIC AMERICAN March 1993 75 Copyright 1993 Scientific American, Inc. 78 SCIENTIFIC AMERICAN March ... glu- tamate stimulates additional NMDA re- SCIENTIFIC AMERICAN March 1993 29 Copyright 1993 Scientific American, Inc. ceptors, increasing the potential for neu- rotoxicity, B...

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... predictions. Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, Inc. 20 SCIENTIFIC AMERICAN March 1994 In the ÒnaiveÓ quark model, one of the three quarks spins in a direction oppo- site ... Mukerjee Copyright 1994 Scientific American, Inc. SCIENTIFIC AMERICAN March 1994 21 membranes surrounding neurons. Pet- tegrew thinks schizophrenics have an impai...

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... CRAWFORD Copyright 1995 Scientific American, Inc. G etting rid of the long-lived, ra- dioactive by-products of nucle- ar power is a problem that has stalked the industry for its 40-year his- toryÑand the ... (800) 77 7-0 444. ScientiÞc American- branded products available. For free catalogue, write Sci- entiÞc American Selections, P.O. Box 11314, Des Moines, IA 5034 0-1 314, or call...

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... 18 SCIENTIFIC AMERICAN March 1996 tion under way in the rem- nant of supernova 1006, this process probably oc- curs in other young super- nova remnants,Ó notes Rob- ert Petre of the ... that arid ice-age con- ditions had broken the Amazonian rain forest into several separate blocks. Haf- fer, a professional geologist and ama- teur bird-watcher, proposed that the ice-age drying ... materia...

Ngày tải lên: 12/05/2014, 15:06

... Schneider News and Analysis22 Scientific American March 1997 Copyright 1997 Scientific American, Inc. News and Analysis24 Scientific American March 1997 T he first time that paleontolo- gist Olivier Rieppel ... of the exhaust noise creat- ed by high-performance jet engines. This noise has prevented widespread use of super- sonic passen- ger aircraft. Current de- signs for mini- mizi...

Ngày tải lên: 12/05/2014, 15:21

... “No; it was very expensive,” he explains. At Dolphin on West 19th, I met Fabi- an, a six-foot-tall, 258-pound, 34-year- old professional wrestler who lifts five times a week. In Fabian’s mind, Fabian is ... pounds.” The one content lifter I met was at Johnny Lats Gym, a 24-hour-a-day hard- core joint on East 17th. Kevin, a 27-year- old bodyguard, stands 6 feet, 6 inches tall and weighs 290 pou...

Ngày tải lên: 12/05/2014, 15:34

... being per- formed by Monsanto —often with ad- miring publicity. In December, an up- roar swept India when rumors cir- culated that Mon- santo had insert- ed a “terminator” gene in its trans- genic ... worked on the small, high-pre- cision screens used in pocket-size com- puters and organizers. Today he supervises a variety of proj- ects. His mantra, printed 12 times con- secutively in his tex...

Ngày tải lên: 12/05/2014, 15:56

... 22 ANTI GRAVITY C-A-T-T-T-T-T-T-T-T T he fog comes on little cat feet,” wrote Carl Sandburg. The great poet and historian may merely have been attempting to animate water va- por, but he presciently ... affirmation was short-lived. The back-to-back failures of the next two spacecraft, the $125-million Mars Climate Or- PAT RAWLINGS Copyright 2000 Scientific American, Inc. biter and the $165-...

Ngày tải lên: 12/05/2014, 16:01

... fast-food wrappers to semicon- ductor coatings and airplane hydraulic fluid. To its credit, 3M decided to phase out its flourishing $300-million-a-year fluorochemical business after it discov- ered ... co- author of the XP report, published a study last year using photolyase, a fasci- nating DNA-repair enzyme, from cyano- bacteria. It directly reverts UV-induced dimers back to normal, us- ing .....

Ngày tải lên: 12/05/2014, 16:08