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Science, New Series, Vol. 230, No. 4721, Oct. 4, 1985


Previous Issue: New Series, Vol. 229, No. 4720, Sep. 27, 1985
Next Issue: New Series, Vol. 230, No. 4722, Oct. 11, 1985


Front Matter (14 pp.)


Letters
Periodicity of Extinctions, p. 8
Antoni Hoffman; Roger Lewin
Destroyers by the Pound?, p. 8
Thomas L. Lincoln


Erratum: Crassulacean Acid Metabolism in the Strangler Clusia rosea Jacq., p. 8
The Status of Engineering, p. 13
D. Kenneth Baker

Origins, pp. 15-18
Steven Weinberg

Cell Interactions in Myxobacterial Growth and Development, pp. 18-24
Martin Dworkin; Dale Kaiser

Pathways of Protein Secretion in Eukaryotes, pp. 25-32
Regis B. Kelly

Structure of the GDP Domain of EF-Tu and Location of the Amino Acids Homologous to ras Oncogene Proteins, pp. 32-36
Frances Jurnak

Human Apolipoprotein B: Structure of Carboxyl-Terminal Domains, Sites of Gene Expression, and Chromosomal Localization, pp. 37-43
Timothy J. Knott; Stanley C. Rall; Thomas L. Innerarity; Shellie F. Jacobson; Mickey S. Urdea; Beatriz Levy-Wilson; Lyn M. Powell; Richard J. Pease; Roger Eddy; Hiroshi Nakai; Mary Byres; Linda M. Priestley; Elaine Robertson; Leslie B. Rall; Christer Betsholtz; Thomas B. Shows; Robert W. Mahley; James Scott


News and Comment
Working Solar Monitor Shot down by ASAT, pp. 44-45
Eliot Marshall
NSA to Provide Secret Codes, pp. 45-46
Gina Kolata
Another Biotech Board Proposal, p. 46
Barbara J. Culliton
Social Scientists Make Case to Congress, p. 47
Constance Holden


Briefing
A Cleanup Plan for Chesapeake Bay, p. 48
Marjorie Sun
Science Textbooks Too Bland for California, p. 48
Eliot Marshall
Pesticide Pact Struck by Opposing Groups, pp. 48-49
Marjorie Sun
Soviets Target Campuses for Intelligence Operations, pp. 49-50
R. Jeffrey Smith
OTA Study Highlights Star Wars Difficulties, p. 50
R. Jeffrey Smith
Magnets Chosen for Supercollider, p. 50
M. Mitchell Waldrop


Research News
New Plasma Physics Lab at Giacobini-Zinner, pp. 51-52
Richard A. Kerr
Microscopy with Spin-Polarized Electrons, pp. 53-54
Arthur L. Robinson
Making mRNA from a Pair of Precursors, p. 55
Roger Lewin


AAAS News
Scientists Aid Search for Argentina's ``Desaparecidos'', pp. 56-57
Eric Stover
Instruments and Lab Equipment Needed, p. 56
Transcripts of National Security Discussion Offered, p. 57
Directory to Identify Research on Impacts of Technology, p. 57


Book Reviews
A Technological Intrusion, pp. 58-59
Ranching, Mining, and the Human Impact of Natural Resource Development
Raymond L. Gold
Review author[s]: Craig R. Humphrey
Intelligence Reexamined, pp. 59-61
Beyond IQ
Robert J. Sternberg
Review author[s]: Robert Glaser
A System of Academies, p. 61
Science Reorganized
James E. McClellan
Review author[s]: Theodore S. Feldman
Gauge Theories, pp. 61-62
Progress in Gauge Field Theory
G. 'T Hooft; A. Jaffe; H. Lehmann; P. K. Mitter; I. M. Singer; R. Stora
Review author[s]: Erhard Seiler


Reports
Infrared Speckle Observations of Io: An Euroption in the Loki Region, pp. 63-65
R. R. Howell; M. T. McGinn
Characterization of Io's Volcanic Activity by Infrared Polarimetry, pp. 65-69
Jay D. Goguen; William M. Sinton
Nodal Modulation of the Lunar Semidiurnal Tide in the Bay of Fundy and Gulf of Maine, pp. 69-71
L.-F. Ku; D. A. Greenberg; C. J. R. Garrett; F. W. Dobson
Induction of AIDS-Like Disease in Macaque Monkeys with T-Cell Tropic Retrovirus STLV-III, pp. 71-73
N. L. Letvin; M. D. Daniel; P. K. Sehgal; R. C. Desrosiers; R. D. Hunt; L. M. Waldron; J. J. MacKey; D. K. Schmidt; L. V. Chalifoux; N. W. King
A Cyanobacterium Capable of Swimming Motility, pp. 74-76
John B. Waterbury; Joanne M. Willey; Diana G. Franks; Frederica W. Valois; Stanley W. Watson
Partial Inversion of the Initiation-Promotion Sequence of Multistage Tumorigenesis in the Skin of NMRI Mice, pp. 76-78
Gerhard Fürstenberger; Volker Kinzel; Michael Schwarz; Friedrich Marks
A Model for the Tertiary Structure of p21, the Product of the ras Oncogene, pp. 78-82
Frank McCormick; Brian F. C. Clark; Troels F. M. la Cour; Morten Kjeldgaard; Leif Norskov-Lauritsen; Jens Nyborg
Z-DNA Forms without an Alternating Purine-pyrimidine Sequence in Solution, pp. 82-84
Juli Feigon; Andrew H.-J. Wang; Gijs A. Van Der Marel; Jacques H. Van Boom; Alexander Rich
Isolation of a Spirochete from the Soft Tick, Ornithodoros coriaceus: A Possible Agent of Epizootic Bovine Abortion, pp. 85-87
Robert S. Lane; Willy Burgdorfer; Stanley F. Hayes; Alan G. Barbour
Intercontinental Spread of a New Antibiotic Resistance Gene on an Epidemic Plasmid, pp. 87-88
Thomas F. O'Brien; Maria Del Pilar Pla; Kenneth H. Mayer; Hiroichi Kishi; Elaine Gilleece; Michael Syvanen; John D. Hopkins
A Neuroendocrine Marker in Tissues of the Immune System, pp. 89-90
Ruth Hogue Angeletti; William F. Hickey


Back Matter (18 pp.)

Previous Issue: New Series, Vol. 229, No. 4720, Sep. 27, 1985
Next Issue: New Series, Vol. 230, No. 4722, Oct. 11, 1985



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