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ISSN 0036-8 -

5 January L 9Volume 203, No. 4375

LETTERS Significance of Nitrosamines in Animal Diets: G. S. Ew(bards andJ. G. Fox; Phenacetin Studies: P. Ciiatrecasas; Science andRegulatory Policy: D. L. Dalvis; C. L. Co,nar.

EDITORIAL Spectacular Science and Ponderous Process: M. F. Singer .

ARTICLES The Early Days of Experimental Neutrino Physics: F. Reines.

Echolocation and Pursuit of Prey by Bats: J. A. Simrnons et al.

Australian Prehistory: New AspectsofAntiquity:J. P. White andJ. F. O'Connell

NEWS AND COMMENT

RESEARCH NEWS

Toxic Substances: EPA and OSHA Are Reluctant Regulators . . . . .. .. . . . .

Study of Terrorism Emerging as an International Endeavor. . . . . . . . . .. ..

OSHA Carcinogen Policy Delayed .

Mental Disorders: A New Approach to Treatment".

Prospects for Proprietary Synchrotron Radiation Research . . . . . . . .. . . . .

The Great Titration Contest. ..........................

AAAS NEWS Margaret Mead: An American Phenomenon, 1901-1978: R. Revelle; AAASSocio-Psychological Prize; San Francisco Meeting in 1980; Asian RegionalSeminar Held in New Delhi; Annual Meeting Notes .

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BOOK REVIEWS

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Science in Culture, reviewed bv A. Thiackrav; Chemists by Profession,J. W. Serwos; Structure and Properties of Nearby Galaxies andThe Large Scale Structure of the Universe, V. Riabin; The Originof the Solar System, S. J. Weidenschilling; Avian BreedingCycles, R. E. Ricklefs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

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AMERICAN ASSOCIATION rOR THE ADVANCEMENT OF SCIENCE

REPORTS \'iking Bistaitic Radar Observations of the Hellas Basin on Mars:Preliminary Results: R. A. Siml)son etal .................... . 45

Coral ReefGrowth in the Galapagos: Limitation by Sea Urchins:P. IV. GlnIniii. G. 1l. Wellington, C. Birkelan(1 ................. . 47

Pyrite: Its Rapid Formation in a Salt Marsh and Its Importance inEcosystem Metabolism: R. W. Howarth . . . . . . . . . . . . . . . . . . . . . 49

Diphytanyl and Dibiphytanyl Glycerol Ether Lipids of MethanogenicArchaebacteria: T. G. Tornuabenie and T. A. Langvworthyv ........... . 51

Ethanol Ingestion: Differences in Blood Acetaldehyde Concentrations inRelatives of Alcoholics and Controls: M. A. Schiickit and V. Ravses . . . . . . 54

N-Acetyl Gramicidin: Single-Channel Properties and Implications forChannel Structure: G. Szabo and D. W. Urrv . . . . . . . . . . ... . . . . . 55

Irradiance Modulation Used to Examine Sound-Radiating Cuticular Motion inInsects: W. Al. Afasters ............................ .

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Synaptic Phosphoproteins: Specific Changes After Repetitive Stimulationof the Hippocampal Slice: M. Browt'ning et al .................. . 60

Catechol-O-Methyltransferase: Thermolabile Enzyme in Erythrocytes ofSubjects Homozygous for Allele for Low Activity: P. D. Scanilon,

F. A. Rawnon(, R. M. Weinshilbouni . 63

Octopamine Receptors, Adenosine 3',5'-Monophosphate, and Neural Controlof Firefly Flashing: J. A. Nathanisoni . . . . . . . . . . . . . . . . . . . . . . . 65

Cholecystokinin in the Brains of Obese and Nonobese Mice: E. St-rais andR. S. Yalosw.................................... . 68

Target Range-Sensitive Neurons in the Auditory Cortex of the Mustache Bat:W. E. O'Neill and N. Siga ........................... . .69

Reducing Epileptic Seizures Through Operant Conditioning of CentralNervous System Activity: Procedural Variables: A. Cott, R. P. Patcloski,A.H.Black ................................... . 73

Plasticity: The Mirror of Experience: D. N. Spinelli and F. E. Jensen ....... . 75

Membrane Glycolipids: Regional Synthesis and Axonal Transport in a SingleIdentified Neuron ofAplysia californica: A. A. Slerbanv, R. T. Ambron,J. H. Schlwtartz..................... ............... . 78

Techniical Commnenits: Factors in Summer Ozone Production in the San FranciscoAir Basin: J. J. Bifalinii; P. R. Miller, J. N. Pitts, Jr., A. Af. Witier;J. S. Sad(lberg, Af. J. Basso, B. A. Okini . . . . . . . . . . . . . . . . . . . . . 81

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OCALcsoN M-(0) --; TRIAL-SCIENCM. Lowan"te CoytT. Wilson Robert LStemrISTICS (U)68{':~-t ' VATMOSHRICAND HYDROSPHERIC GENERAL (X)ueFW -Greenhouset s -SCIENCES(W) -Aen" V. Astm'Glaser'- - - nneth -C Spengler JosephF. Coates

ki n Asociatin *or the AdvnGcent of Scinc was foned in 1648 nd nporad in 1874. Is obecti.fuwher the work of scient, to faclitate Cooperaon among them, to fosr slentifictreedom and6sponstbihpovwehe ecines Of sie In the prmotion of hmn wefre, and to incre plc undetandendcito fihemnpoetacorn proie of the methods of science in human progress.

COVER

Slate-pencil sea urchin, Emci(laristhoi,arCsii (Val.), perched on the reef-building coral Pocillopora (lalmicorlnis(L.). In Panama, the urchin grazes onthe coral only if deprived (for severalweeks) of coralline algae and other pre-ferred prey. See page 47. IG. M. Wel-lington, University of California, SantaBar-baral

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203 (4375)

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