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scientific american - 1998 04 - the unwired world

scientific american   -  1998 04  -  the unwired world

scientific american - 1998 04 - the unwired world

... andapplied them to the time-honored tech-nology of fuel cells. The key was in the packaging. Whereas most fuel-cell re-searchers start with the design of the electrolyte and electrodes, Hockaday re-alized ... 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 ... http://hpl3sn05.cern.ch:8080/ams01. html on the World Wide Web.Cosmic AntimatterALFRED T. KAMAJIANSACopyright 1998 Scientific American, Inc.Post-Polio Syndrome42 Scientific American April 1998 Post-Polio SyndromeDecades...
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scientific american   -  1994 04  -  the dilemmas of prostate cancer

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 ... apply a DC volt-age? The egg tray on which the marblelies will tilt. If the tiltÑthat is, the volt-ageÑis great enough, the marble canroll out of the eggcup and down the eggtray. The marble...
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scientific american   -  1993 04  -  controlling the quantum jitters of atoms

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   -  1995 06  -  the world's strongest magnets

scientific american - 1995 06 - the world's strongest magnets

... thatthey were the few Cretaceous survivors. The foundation of this theory beganto shake in 1981, when fossils of Òop-posite birdsÓ were unearthed in Chinaand, then, all over the Northern Hemi-sphere. ... and lead to the hy-poactivity seen there during clinical de-pression. If he is right, the theory wouldexplain the gender gap, at least in part.Others at the NIMH have more to add.ÒThere are ... year. The game is the low-ranking maleshide, and the females try to get to them.But the high-ranking males follow the females and try to keep them from mat-ing with the low-ranking males,Ó Berarddescribes....
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scientific american   -  1998 01  -  flying over the solar system

scientific american - 1998 01 - flying over the solar system

... of a tiny needle. They also tested the glucose levels in these volunteers by the finger-stick method. They found thatboth the skin-fluid sample and the fin-ger-stick measured the correct glucoselevels ... 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 microtubules or large bundles of cross-linked ... are the com-pression struts, and muscles, tendons and ligaments are the tension-bearing members. At the other end of the scale, pro-teins and other key molecules in the body also stabilize them-selves...
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scientific american   -  1998 02  -  wrapping up the universe

scientific american - 1998 02 - wrapping up the universe

... the thigh was shorter than the shin,and the fibula, the bone to the side of the shinbone, was re- The Origin of Birds and Their Flight Scientific American February 1998 43Bones of ContentionAlthough ... bats, the hand part of the wing generates the thrust, and the rest of the wing provides the lift.Jeremy M. V. Rayner of the University of Bristol showed in the late 1970s that the down-and-forward ... BIRDS The Origin of Birds and Their FlightTHREE FUNCTIONAL TOESTHEROPODACoelophysis40 Scientific American February 1998 ED HECKCopyright 1998 Scientific American, Inc.with Deinonychus and other...
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scientific american   -  1998 11  -  greenland's mysterious meteor  -  fire over the ice

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 goodfortune, and the name was a homageto the heritage of Juris ... firsttime. The heat is daunting. As the after-noon wears on, the debate betweenJohnson and Fiedel moves first oneway, then the other, like a tug-of-war. The debate might never be resolved. The site’s ... rocket. The National Aero-nautics and Space Ad-ministration has consid-ered them for space sci-ence. The Departmentof Defense is interestedin them for use in bal-listic-missile intercep-tors;...
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scientific american   -  2003 04  -  50 years of the double helix

scientific american - 2003 04 - 50 years of the double helix

... development,” the au-thors wrote in the winter-spring issue of Law and Con-temporary Problems. (Their other article on the Bayh-Dole Act appeared in the January-February issue of American Scientist.)Rai ... moreof the craft’s mass to the all-important ther-mal shield. After descending to the lower at-mosphere, the capsule could float on para-chutes to an ocean landing, just as the Apol-lo modules ... commu-nity?” The average of their answers is the ba-sis of the subjective threshold calculation, in-dicated by the dark blue line. On average the respondents named a figure 76 percent high-er than the...
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scientific american   -  2004 04  -  has science missed half the brain

scientific american - 2004 04 - has science missed half the brain

... the turn of the 20th century.” The stone “contains morelithium than any other stone on the planet” and “emits a signa-ture one-of-a-kind healing energy.” How does the Golden ‘C’water get these ... subjects at the time of the serendipitous observation. Of the 30 individuals who received the EP-MRSIscans, 23 reported immediate mood im-provement, the team says in the January issueof the American ... blockbuster By GARY STIX1Design the protein2Synthesize peptides3Attach polymers4Join peptide chains5Fold into active protein Gly-Leu-Phe-Asp-Gln Gly-Leu-Phe-Asp-Gln PolymerDESIGNERPROTEIN...
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scientific american   -  1993 01  -  the turbulent birth of the milky way

scientific american - 1993 01 - the turbulent birth of the milky way

... 4,40012-BILLION-YEAR-OLD AGE TRACK15-BILLION-YEAR-OLD AGE TRACKNGC 288NGC 362Copyright 1992 Scientific American, Inc.means that within the halo the only re-maining main-sequence stars are the extremely ... declines as the reefs get farther awayfrom two centersÑone in the Indo-Pa-ciÞc and the other in the Caribbean. The outlines of a map marking plum-meting diversity coincide with the con-tours ... around the world in the latitudes that general-ly fall between the southern tip of Flori-da and mid-Australia. They rank among the most biologically productive of allmarine ecosystems. Because they...
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