scientific american - 2004 04 - has science missed half the brain
scientific american - 2004 04 - has science missed half the brain
... dependence.COPYRIGHT 2 004 SCIENTIFIC AMERICAN, INC.26 SCIENTIFIC AMERICAN APRIL 2 004 JEFF GREEN Reuters Newmedia Inc./CorbisIn mid-February the U.S. governmentgave up on its search for the herd matesof the ... in the tube, their brain activity,seen on a computer screen, is recorded.COPYRIGHT 2 004 SCIENTIFIC AMERICAN, INC.SCAN30 SCIENTIFIC AMERICAN APRIL 2 004 newsPhysicists investigating heavy-particlecollisions ... memories.COPYRIGHT 2 004 SCIENTIFIC AMERICAN, INC.NEUROSCIENCE54 The Other Half of the Brain BY R. DOUGLAS FIELDSGlial cells, long viewed as mere support players in the brain, may be nearly...
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scientific american - 2004 07 - will gene doping change the nature of sport
... PAP6 T cells then attack PAP-containing cancer cell40 SCIENTIFIC AMERICAN JULY 2 004 COPYRIGHT 2 004 SCIENTIFIC AMERICAN, INC.quires isolating the patient’s white blood cells and thenseparating ... PercussionCOPYRIGHT 2 004 SCIENTIFIC AMERICAN, INC.A 400-YEAR-OLD HOAX? • $1-MILLION PROOF FOR THE SHAPE OF SPACEJULY 2 004 WWW.SCIAM.COMMad Cow Disease: Faster Tests, Future TherapiesWhen MethaneRuled ... COPYRIGHT 2 004 SCIENTIFIC AMERICAN, INC.38 SCIENTIFIC AMERICAN JULY 2 004 NASA/JPL/CORNELL (top); CONEYL JAY Science Photo Library (bottom) newsSCANBIOLOGYMixing inMitochondria The energy-producing...
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scientific american - 1993 04 - controlling the quantum jitters of atoms
... SciDex™, SCI-ENTIFIC AMERICAN, 415 Madison Ave-nue, New York, N.Y. 1001 7-1 111, or fax(212) 35 5-0 408.Photocopying rights are hereby grant-ed by Scientific American, Inc., to li-braries and others ... stable, the highbirth 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 older, how-ever, the average age of the ... aÝected pro-cesses are at the time of their disregula-tion and the ability of the organism ei-ther to compensate for or to repair the damage. If the damage disrupts the reg-ulation of cell growth...
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scientific american - 1994 04 - the dilemmas of prostate cancer
... powerscan help them rise to the top.Since then, the Morrises and Alexan-der have had a falling-out, with eachside accusing the other of hogging cred-it for the concept of nonlethality. ÒAlex-ander ... of the AC Þeld. When the marbleis hopping down the egg tray with the help of the AC Þeld, augmenting the av-erage tilt of the egg tray by increasing the DC voltage does not change the av-erage ... quantum-mechan-ical eÝect has since been conÞrmed byother groups. Tunneling has been pre-dicted by Kazumi Maki of the Universi-ty of Southern California and by the lateJohn Bardeen of the University...
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scientific american - 1995 03 - can science cure crime
... CRAWFORDCopyright 1995 Scientific American, Inc.Getting 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 pressure ... CubansÕhealth has worsened because they havehad little to eat during what the govern-ment has dubbed the periodo especial. The crisis has prompted a U.S basedphysiciansÕ group to ask that the Amer-ican ... ar-ticle in the October 1994 issue of the Journal of the Florida Medical Associa-tion, The Time Has Come to Lift the Economic Embargo against Cuba,Ó not-ed that the country experienced sub-stantially...
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scientific american - 1995 04 - machines that learn from hints
... from the earth. Each quasar shines throughonly a single part of a cloud, however,so the structure and extent of thesecosmic will-oÕ -the- wisps remained un-known. The absorbed radiation is most-ly ... trig-ger a sensation of pleasure, enticing the drinker to indulge further.Naltrexone mimics the shape of en-dorphins but not their action. By block-ing the binding of these neurotransmit-ters ... 1996 Scientific American, Inc.stantially diÝerent from those expect-ed. Resolving the discrepancies may behelpful to theoreticians trying to pre-dict the properties of the long-soughtBose-Einstein...
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scientific american - 1996 04 - smart rooms
... America into the world of the future, but it has nonethe-less shattered the status quo. There is noturning back. Americans must now ei-ther build the media world they want—dragging their leaders ... from the market.” Dow Corning, one of the lead-ing producers of silicone used in medi-cal devices, has stopped supplying im-plant companies with the material. Ac-cording to the FDA, there has ... threesome—herself, the birdand a student. One person holds up anobject; the other names and then re-ceives it. Listening, watching and prac-ticing, the bird learns the word thatwill get him the new toy. These...
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scientific american - 1997 04 - why things go wrong
... with the best features. They havefound that they can boost production bymanipulating water level, sunlight andother factors. But the tricky part—mak-ing sure the treasured stigmas, the fe-male ... streets. The vehi-cle is available only in southern Califor-nia and Arizona, partly because coldweather adversely affects the lead-acidbatteries and shortens the car’s range.And the vehicle ... are abnor-mal versions ofamyloid protein(PrP). Research-ers at the Nation-al Institutes ofHealth and the University of Mi-lan recentlyfound normal PrPin the brains ofspawning sal-mon....
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scientific american - 1998 04 - the unwired world
... in-fects more than 95 percent of the motor neurons in the spinal cordand many other cells in the brain. The infected cells either overcome the virus or die. The extent of paralysis is unpre-dictable. ... aperture, the su-perconducting magnet deflects the neg-atively charged electrons in one direc-tion and the positively charged protonsand positrons in the other. The detectorsmeasure the charge ... personsexperiencing the late effects of polio - nally started attracting the attention of the medical community, and in the ear-ly 1980s the term post-polio syndromewas coined. Today the syndrome is de-fined...
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scientific american - 1999 04 - endless space (maybe not)
... the turn of the century.These giant light-col-lecting machines in-clude another MaunaKea resident, the Gemini North Obser-vatory, backed by the U.S. and six other na-tions, which is near-ing ... clean-running vehicle” that gets55 to 65 rather than 80 mpg but other-wise meets the supercar goals. In addi-tion, PNGV executives emphasize the program’s two other, lesser-known tar-gets: ... Richard K.Guy of the University of Calgary. The book has become the bible of recreation-al mathematics; it describes dozens of brain- teasing games, most of them in-vented by the authors, with...
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