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Science, New Series, Vol. 265, No. 5178, Sep. 9, 1994


Previous Issue: New Series, Vol. 265, No. 5177, Sep. 2, 1994
Next Issue: New Series, Vol. 265, No. 5179, Sep. 16, 1994


Front Matter (22 pp.)
Editorial: Risk Assessments of Low-Level Exposures, p. 1507
Philip H. Abelson


Letters
Genetic Testing, pp. 1509-1510
J. Alexander Lowden; James E. Cleaver
Mechanism of Scrapie Replication, p. 1510
Peter T. Lansbury
Biodiversity Questions, pp. 1510-1511
Paul R. Epstein; Godfrey P. Chikwenhere; Truman P. Young
Protein Configurations, p. 1511
J. Edwin Blalock


Corrections and Clarifications: Ecologists Gather for Mix of Policy, Science in Nashvilles, p. 1511
ScienceScope, p. 1515
Richard Stone


News and Comment
NSF Gears Up for a Building Boom, pp. 1516-1518
Jeffrey Mervis
USDA Holds Up Grants to Make a Political Point, pp. 1518-1519
Eliot Marshall
EPA Campaigns for Safer Chemicals, p. 1519
Faye Flam
Agreements Set Rules of the Road for Global Collaboration, pp. 1520-1521
Robert F. Service
Ecologists Draft Plan to Dig in the Dirt, p. 1521
Peter Aldhous


Research News
Triggering the First Line of Defense, pp. 1522-1524
Robert F. Service
A New Way of Seeing Proteins in Motion, p. 1525
Jocelyn Kaiser
Tuna Stocks: East Meets West, pp. 1525-1526
Constance Holden
Astronomers Gossip About The (Cosmic) Neighborhood, pp. 1526-1527
Ray Jayawardhana
Climate Modeling's Fudge Factor Comes Under Fire, p. 1528
Richard A. Kerr


Random Samples, p. 1529
Constance Holden


Policy Forum
Which Whales Are Hunted? A Molecular Genetic Approach to Monitoring Whaling, pp. 1538-1539
C. S. Baker; S. R. Palumbi


Perspectives
Thumbs Up for Our Early Ancestors, pp. 1540-1541
Leslie C. Aiello
Attractive Axon Guidance Molecules, pp. 1541-1542
Herwig Baier; Friedrich Bonhoeffer


First Images of Asteroid 243 Ida, pp. 1543-1547
M. J. S. Belton; C. R. Chapman; J. Veverka; K. P. Klaasen; A. Harch; R. Greeley; R. Greenberg; J. W. Head III; A. McEwen; D. Morrison; P. C. Thomas; M. E. Davies; M. H. Carr; G. Neukum; F. P. Fanale; D. R. Davis; C. Anger; P. J. Gierasch; A. P. Ingersoll; C. B. Pilcher

Catastrophes, Phase Shifts, and Large-Scale Degradation of a Caribbean Coral Reef, pp. 1547-1551
Terence P. Hughes


Reports
Simultaneous Observation of Columnar Defects and Magnetic Flux Lines in High-Temperature Bi2Sr2CaCu2O8 Superconductors, pp. 1552-1555
Hongjie Dai; Seokwon Yoon; Jie Liu; Ramesh C. Budhani; Charles M. Lieber
Lattice Location of Trace Elements Within Minerals and at Their Surfaces with X-ray Standing Waves, pp. 1555-1557
Yonglin Qian; Neil C. Sturchio; Ronald P. Chiarello; Paul F. Lyman; Tien-Lin Lee; Michael J. Bedzyk
Reduction of Permeability in Granite at Elevated Temperatures, pp. 1558-1561
Diane E. Moore; David A. Lockner; James D. Byerlee
Grain Size-Dependent Alteration and the Magnetization of Oceanic Basalts, pp. 1561-1563
Dennis V. Kent; Jeff Gee
Rapid Emplacement of Young Oceanic Lithosphere: Argon Geochronology of the Oman Ophiolite, pp. 1563-1565
Bradley R. Hacker
Milankovitch Forcing of the Last Interglacial Sea Level, pp. 1566-1568
Thomas J. Crowley; Kwang-Yul Kim
Carbon Dioxide Supersaturation in the Surface Waters of Lakes, pp. 1568-1570
Jonathan J. Cole; Nina F. Caraco; George W. Kling; Timothy K. Kratz
Fossil Evidence for Early Hominid Tool Use, pp. 1570-1573
Randall L. Susman
Requirement of Transcription Factor PU.1 in the Development of Multiple Hematopoietic Lineages, pp. 1573-1577
Edward W. Scott; M. Celeste Simon; John Anastasi; Harinder Singh
Direct Observation of Enzyme Activity with the Atomic Force Microscope, pp. 1577-1579
Manfred Radmacher; Monika Fritz; Helen G. Hansma; Paul K. Hansma
Detection of Endogenous Malondialdehyde-Deoxyguanosine Adducts in Human Liver, pp. 1580-1582
Ajai K. Chaudhary; Munetaka Nokubo; G. Ramachandra Reddy; Suresh N. Yeola; Jason D. Morrow; Ian A. Blair; Lawrence J. Marnett
Control of Angiogenesis in Fibroblasts by p53 Regulation of Thrombospondin-1, pp. 1582-1584
Kristina M. Dameron; Olga V. Volpert; Michael A. Tainsky; Noël Bouck
Mutations in aquaporin-1 in Phenotypically Normal Humans Without Functional CHIP Water Channels, pp. 1585-1587
Gregory M. Preston; Barbara L. Smith; Mark L. Zeidel; John J. Moulds; Peter Agre
Reduced Rate of Disease Development After HIV-2 Infection as Compared to HIV-1, pp. 1587-1590
Richard Marlink; Phyllis Kanki; Ibou Thior; Karin Travers; Geoffrey Eisen; Tidiane Siby; Ibrahima Traore; Chung-Cheng Hsieh; Mamadou Ciré Dia; El-Hadji Gueye; James Hellinger; Aissatou Guèye-Ndiaye; Jean-Louis Sankalé; Ibrahima Ndoye; Souleymane Mboup; Max Essex
Analysis of Sequence Transfers Resembling Gene Conversion in a Mouse Antibody Transgene, pp. 1590-1593
Bo Xu; Erik Selsing
Involvement of Nitric Oxide in the Elimination of a Transient Retinotectal Projection in Development, pp. 1593-1596
Hope H. Wu; Cheri V. Williams; Steven C. McLoon
Activation of the Sphingomyelin Cycle Through the Low-Affinity Neurotrophin Receptor, pp. 1596-1599
Rick T. Dobrowsky; Mark H. Werner; Alexander M. Castellino; Moses V. Chao; Yusuf A. Hannun


Technical Comments
Entropic Elasticity of λ-Phage DNA, pp. 1599-1600
C. Bustamante; J. F. Marko; E. D. Siggia; S. Smith
Explicit and Implicit Learning and Maps of Cortical Motor Output, pp. 1600-1601
Michael A. Stadler; Alvaro Pascual-Leone; Jordan Grafman; Mark Hallett


Book Reviews
The Statistics of HIV, pp. 1602-1603
AIDS Epidemiology. A Quantitative Approach.
Ron Brookmeyer; Mitchell H. Gail
Review author[s]: Ira M. Longini Jr.
Lowell's Venture, p. 1604
The Explorers of Mars Hill. A Centennial History of Lowell Observatory, 1894-1994.
William Lowell Putnam
Review author[s]: John Lankford
----------------, pp. 1604-1605
The History of Modern Mathematics. Vol. 3, Images, Ideas, and Communities.
Eberhard Knobloch; David E. Rowe
Review author[s]: Katherine Livingston
----------------, p. 1605
Early Quantum Electrodynamics. A Source Book.
Arthur I. Miller
Review author[s]: Katherine Livingston
Books Received, p. 1605


Back Matter (23 pp.)

Previous Issue: New Series, Vol. 265, No. 5177, Sep. 2, 1994
Next Issue: New Series, Vol. 265, No. 5179, Sep. 16, 1994



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