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Science, New Series, Vol. 272, No. 5260, Apr. 19, 1996


Previous Issue: New Series, Vol. 272, No. 5259, Apr. 12, 1996
Next Issue: New Series, Vol. 272, No. 5261, Apr. 26, 1996


Front Matter (21 pp.)
Editorial: Ambiguity in the Practice of Science, p. 333
Frederick Grinnell


Letters
Politics and Science, p. 335
H. David Kay; Henry Lardy
Internet Access, pp. 335-337
Marvin E. Gozum; Richard L. Meier; Robin Standish; R. F. Soames Job; Jaap J. Beintema
Nile Delta Erosion, p. 337
Robert L. Wiegel
New Database, pp. 337-338
Jiri Vondrasek; Alexander Wlodawer
Affirmative Action, pp. 338-339
E. B. Hook
DOE Privatization, p. 339
Richard I. Mateles


Corrections and Clarifications: Tilting Against a Major Theory of Movement Control, p. 339
Corrections and Clarifications: Manic-Depression Findings Spark Polarized Debate, p. 339
Corrections and Clarifications: Faunal Evidence and Sterkfontein Member 2 Foot Bones of Early Hominid, p. 339
Corrections and Clarifications: Natural' Cancer Prevention Trial Halted, p. 339
Corrections and Clarifications: Alabama and Evolution, p. 339
ScienceScope, p. 341
Jocelyn Kaiser


News
URI Tries Downsizing by Formula, pp. 342-344
Wade Roush
Deliberate Flood Renews Habitats, pp. 344-345
Bernice Wuethrich
Report Urges NSF to Promote Teaching, p. 345
Jeffrey Mervis
First Americans: Not Mammoth Hunters, But Forest Dwellers?, pp. 346-347
Ann Gibbons
Gambling On a Martian Landing Site, pp. 347-348
Richard A. Kerr
A 24-Hour Circadian Clock is Found in the Mammalian Retina, p. 349
Virginia Morell


Random Samples, p. 351
Constance Holden


Special News Report
The Explosions That Shook the World, pp. 352-354
Richard Stone
Chernobyl Research Becomes International Growth Industry, pp. 355-356
Nigel Williams; Michael Balter
Children Become the First Victims of Fallout, pp. 357+359-360
Michael Balter
Leukemia Studies Continue to Draw a Blank, p. 358
Nigel Williams


Book Reviews
Grand Constructors, pp. 363-364
Engineers of Dreams. Great Bridge Builders and the Spanning of America.
Henry Petroski
Review author[s]: Emory L. Kemp
Also Noteworthy, p. 364
Physics of the Magnetopause.
P. Song; B. U. Ö. Sonnerup; M. F. Thomsen
Review author[s]: Fran Bagenal
Also Noteworthy, p. 364
Conservation Genetics. Case Histories from Nature.
John C. Avise; James L. Hamrick
Review author[s]: Katherine Livingston
Books Received, p. 364


Perspectives
Giant Magnetoresistance in Transition Metal Oxides, pp. 369-370
C. N. R. Rao; A. K. Cheetham
Green Light for Steroid Hormones, pp. 370-371
David W. Russell
Histone Deacetylase: A Regulator of Transcription, pp. 371-372
Alan P. Wolffe


Paleoindian Cave Dwellers in the Amazon: The Peopling of the Americas, pp. 373-384
A. C. Roosevelt; M. Lima da Costa; C. Lopes Machado; M. Michab; N. Mercier; H. Valladas; J. Feathers; W. Barnett; M. Imazio da Silveira; A. Henderson; J. Silva; B. Chernoff; D. S. Reese; J. A. Holman; N. Toth; K. Schick


Reports
Molecularly Adsorbed Oxygen Species on Si(111)-(7×7): STM-Induced Dissociative Attachment Studies, pp. 385-388
R. Martel; Ph. Avouris; I.-W. Lyo
Spatiotemporal Chaos in Electroconvection, pp. 388-390
Michael Dennin; Guenter Ahlers; David S. Cannell
Continental Crust, Crustal Underplating, and Low-Q Upper Mantle Beneath an Oceanic Island Arc, pp. 390-392
Kiyoshi Suyehiro; Narumi Takahashi; Yoshiro Ariie; Yasutaka Yokoi; Ryota Hino; Masanao Shinohara; Toshihiko Kanazawa; Naoshi Hirata; Hidekazu Tokuyama; Asahiko Taira
Rapid Exchange between Soil Carbon and Atmospheric Carbon Dioxide Driven by Temperature Change, pp. 393-396
Susan E. Trumbore; Oliver A. Chadwick; Ronald Amundson
Engineered Interfaces for Adherent Diamond Coatings on Large Thermal- Expansion Coefficient Mismatched Substrates, pp. 396-398
Rajiv K. Singh; D. R. Gilbert; J. Fitz-Gerald; S. Harkness; D. G. Lee
A Role for Brassinosteroids in Light-Dependent Development of Arabidopsis, pp. 398-401
Jianming Li; Punita Nagpal; Veronique Vitart; Trevor C. McMorris; Joanne Chory
Switching from Cut-and-Paste to Replicative Tn7 Transposition, pp. 401-404
Earl W. May; Nancy L. Craig
Independent Modes of Natural Killing Distinguished in Mice Lacking Lag3, pp. 405-408
Toru Miyazaki; Andrée Dierich; Christophe Benoist; Diane Mathis
A Mammalian Histone Deacetylase Related to the Yeast Transciptional Regulator Rpd3p, pp. 408-411
Jack Taunton; Christian A. Hassig; Stuart L. Schreiber
Regulation of an Early Developmental Checkpoint in the B Cell Pathway by Igβ, pp. 411-414
Shiaoching Gong; Michel C. Nussenzweig
Homocysteine Antagonism of Nitric Oxide-Related Cytostasis in Salmonella typhimurium, pp. 414-417
Mary Ann De Groote; Traci Testerman; Yisheng Xu; George Stauffer; Ferric C. Fang
CNS Gene Encoding Astrotactin, Which Supports Neuronal Migration Along Glial Fibers, pp. 417-419
Chen Zheng; Nathaniel Heintz; Mary E. Hatten
Circadian Rhythms in Cultured Mammalian Retina, pp. 419-421
Gianluca Tosini; Michael Menaker
Requirement for α-CaMKII in Experience-Dependent Plasticity of the Barrel Cortex, pp. 421-423
Stanislaw Glazewski; Chuan-Min Chen; Alcino Silva; Kevin Fox


Technical Comments
Does Macroscopic Quantum Coherence Occur in Ferritin?, pp. 424-426
Javier Tejada; Anupam Garg; S. Gider; D. D. Awschalom; D. P. DiVincenzo; D. Loss


Back Matter (26 pp.)

Previous Issue: New Series, Vol. 272, No. 5259, Apr. 12, 1996
Next Issue: New Series, Vol. 272, No. 5261, Apr. 26, 1996



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