... the delicate bal-ance among symbionts is destroyed. SCIENTIFIC AMERICAN January 1993 65Copyright 1992 Scientific American, Inc. SCIENTIFIC AMERICAN January 1993 69tures. Although it appears ... homogeneous. SCIENTIFIC AMERICAN January 1993 75IRON ABUNDANCE (SOLAR UNITS)OXYGEN-TO-IRON RATIO (SOLAR UNITS)0.010.001 0.1 1.04321HALO STARSOLD DISK STARSCopyright 1992 Scientific American, ... Chaput; Vice Presi-dents: Jonathan Piel, John J. Moeling, Jr.10 SCIENTIFICAMERICAN January 1993Copyright 1992 Scientific American, Inc.s a feminist in a family with Victo-rian mores and...
... zinc-centeredstructure devoted to DNA recognition.62 SCIENTIFICAMERICAN February 1993Copyright 1993 Scientific American, Inc.68 SCIENTIFICAMERICAN February 1993product; cilastatin does not. ... in the number of bases separating the half sites.64 SCIENTIFICAMERICAN February 1993Copyright 1993 Scientific American, Inc.44 SCIENTIFICAMERICAN February 1993the combined eÝect of environmentalproblems ... Bar-ger; Vice Presidents : Jonathan Piel, John J.Moeling, Jr.8 SCIENTIFICAMERICAN February 1993Copyright 1993 Scientific American, Inc.three hydrophobic amino acids in vir-tually identical...
... Bar-ger ; Vice Presidents: Jonathan Piel, John J.Moeling, Jr.8 SCIENTIFICAMERICAN July 1993PRINTED IN U.S.A.Copyright 1993 Scientific American, Inc.repolarize and prepare for Þring anew.Impulses ... THRESHOLDCopyright 1993 Scientific American, Inc.LETTERS TO THE EDITORSMore Black Hole ParadoxesI enjoyed ÒBlack Holes and the Cen-trifugal Force Paradox,Ó by Marek Ar-tur Abramowicz [SCIENTIFIC AMERICAN, March], ... workplace and consumerproducts.Second, these oÛcials have often40 SCIENTIFICAMERICAN July 1993Copyright 1993 Scientific American, Inc....
... think,Why not? ÑJohn Horgan38 SCIENTIFICAMERICAN November 1993Copyright 1993 Scientific American, Inc. SCIENTIFIC AMERICAN November 1993 73Copyright 1993 Scientific American, Inc.glycine receptors, ... Iwould have to add that this is true forAfrican-Americans, Hispanic-Americans,female Americans, gay Americans, poorAmericans, handicapped Americans andother oppressed minorities. ÒSociety ... bombers).Battleship, 1941Continued on page 76Copyright 1993 Scientific American, Inc.Copyright 1993 Scientific American, Inc.12 SCIENTIFICAMERICAN November 199350 AND 100 YEARS AGO0NOVEMBER 1943ÒAir-conditioning...
... X-RAYSCOMPTONOBSERVATORYRADIOTELESCOPEOPTICAL TELESCOPECopyright 1993 Scientific American, Inc.18 SCIENTIFICAMERICAN December 1993hree years ago W. French Ander-son, then at the National ... safety,Ó Radlick boasts,Òand we got very good metabolic sup-32 SCIENTIFICAMERICAN December 1993Copyright 1993 Scientific American, Inc.portÑenough to encourage us verystrongly to go into ... a viable and reliable treatment inits own right. ÑW. Wayt Gibbs SCIENTIFIC AMERICAN December 1993 33Copyright 1993 Scientific American, Inc.razilian lore has it that a red-haired, human-sized...