Articles

 The Question of South Africa

David S. Evans
Science 18 February 1972: 705.
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 Letter to the Editor

Eduard M. van Zinderen Bakker, Sr.
Science 18 February 1972: 705.
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 Letter to the Editor

Lewis Greenwald
Science 18 February 1972: 705.
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 National Security and the Environment

Larry M. Svart
Science 18 February 1972: 705-706.
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 Test Bias Bibliography

Richard O. Fortna
Science 18 February 1972: 706-707.
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 Antilead Regulations

William B. Hoyt
Science 18 February 1972: 707.
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 Kansas State University

Robin Higham
Science 18 February 1972: 707.
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 Energy Conservation

Ann E. Larimore, Paul S. Hoover, and Robert L. Olson
Science 18 February 1972: 707.
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 Old Cities, New Cities, No Cities

Science 18 February 1972: 709.
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 Ecolibrium

Athelstan Spilhaus
Science 18 February 1972: 711-715.
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 Peace through Change: The Risk and Promise for Man's Future

Hubert H. Humphrey
Science 18 February 1972: 716-719.
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The Fluid Mosaic Model of the Structure of Cell Membranes

S. J. Singer and Garth L. Nicolson
Science 18 February 1972: 720-731.
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 The Soviet Space Program: Effort Said to Surpass Peak U. S. Level

Robert Gillette
Science 18 February 1972: 731-736.
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 HEW Study on Financial Distress in Medical Schools Focuses on Shortcomings in Data Showing Cost Allocation

John Walsh
Science 18 February 1972: 732-733.
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 Human Environment Conference: Search for a Modus Vivendi

Nigel Hawkes
Science 18 February 1972: 736-738.
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 Vietnam Land Devastation Detailed

Constance Holden
Science 18 February 1972: 737.
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 Symbolic Changes at NSF

C. H.
Science 18 February 1972: 738.
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 Physics with Lasers: High Resolution Coming of Age

William D. Metz
Science 18 February 1972: 739-740.
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 Book Reviews

Science 18 February 1972: 741-747.
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 Books Received

Science 18 February 1972: 747-815.
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Venus Clouds: A Dirty Hydrochloric Acid Model

Bruce Hapke
Science 18 February 1972: 748-751.
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Photolysis of Formaldehyde as a Hydrogen Atom Source in the Lower Atmosphere

Jack G. Calvert, J. Alistair Kerr, Kenneth L. Demerjian, and Robert D. McQuigg
Science 18 February 1972: 751-752.
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Ultrathin Amorphous Coatings on Lunar Dust Grains

J. P. Bibring, J. P. Duraud, L. Durrieu, C. Jouret, M. Maurette, and R. Meunier
Science 18 February 1972: 753-755.
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Size Frequency Distribution of Martian Craters and Relative Age of Light and Dark Terrains

Alexander Woronow and Elbert A. King, Jr.
Science 18 February 1972: 755-757.
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Cyclic Nucleotide Phosphodiesterase: High Activity in a Mammalian Photoreceptor

R. G. Pannbacker, D. E. Fleischman, and D. W. Reed
Science 18 February 1972: 757-758.
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Air Containing Nitrogen-15 Ammonia: Foliar Absorption by Corn Seedlings

Lynn K. Porter, Frank G. Viets, Jr., and Gordon L. Hutchinson
Science 18 February 1972: 759-761.
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Dihydroxyphenylalanine in Rat Food Containing Wheat and Oats

R. Hoeldtke, B. S. Baliga, P. Issenberg, and R. J. Wurtman
Science 18 February 1972: 761-762.
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Presence of Lateral Eye Lens Crystallins in the Median Eye of the American Chameleon

David S. McDevitt
Science 18 February 1972: 763-764.
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Triiodothyronine: The 3'-Iodine Is Proximal to the -Ring in Crystal Structure Conformation

Norman Camerman and Arthur Camerman
Science 18 February 1972: 764-766.
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Tissue Factor (Thromboplastin): Localization to Plasma Membranes by Peroxidase-Conjugated Antibodies

Steven M. Zeldis, Yale Nemerson, Frances A. Pitlick, and Thomas L. Lentz
Science 18 February 1972: 766-768.
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1,25-Dihydroxycholecalciferol: A Potent Stimulator of Bone Resorption in Tissue Culture

L. G. Raisz, C. L. Trummel, M. F. Holick, and H. F. Deluca
Science 18 February 1972: 768-769.
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Spermatogenesis in Cultured Testes of the Cynthia Silkworm: Effects of Ecdysone and of Prothoracic Glands

Michael P. Kambysellis and Carroll M. Williams
Science 18 February 1972: 769-770.
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Atmospheric Ammonia: Absorption by Plant Leaves

G. L. Hutchinson, R. J. Millington, and D. B. Peters
Science 18 February 1972: 771-772.
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Evidence of Pollen Tubes in Paleozoic Pteridosperms

Gar W. Rothwell
Science 18 February 1972: 772-774.
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Cytochalasin B: Does It Affect Actin-Like Filaments?

Arthur Forer, J. Emmersem, and O. Behnke
Science 18 February 1972: 774-776.
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Wound-Induced Proteinase Inhibitor in Plant Leaves: A Possible Defense Mechanism against Insects

T. R. Green and C. A. Ryan
Science 18 February 1972: 776-777.
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Cannabinoids with a Propyl Side Chain in Cannabis: Occurrence and Chromatographic Behavior

Rokus A. de Zeeuw, Jaap Wijsbeek, Douwe D. Breimer, Tom B. Vree, Cees A. M. van Genneken, and Jacques M. van Rossum
Science 18 February 1972: 778-779.
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Ultrastructural Evidence for Nephropathy Induced by Long-Term Exposure to Small Amounts of Methyl Mercury

Bruce A. Fowler
Science 18 February 1972: 780-781.
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Improved Flow Rates with Porous Sephadex Gels

David H. Sachs and Elizabeth Painter
Science 18 February 1972: 781-782.
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Scanning Electron Microscopy of the Human Fallopian Tube

Alex Ferenczy, Ralph M. Richart, Frederic J. Agate, Jr., Mabel L. Purkerson, and Edward W. Dempsey
Science 18 February 1972: 783-784.
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Inhibition of Antibodies to Nuclear Antigen and to DNA in New Zealand Mice Infected with Lactate Dehydrogenase Virus

Michael B. A. Oldstone and Frank J. Dixon
Science 18 February 1972: 784-786.
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Photosynthetic Adaptation to High Temperatures: A Field Study in Death Valley, California

Ollw Björkman, Robert W. Pearcy, A. Tyrone Harrison, and Harold Mooney
Science 18 February 1972: 786-789.
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Rapid Increase of Phenylethanolamine N-Methyltransferase by Environmental Stress in an Inbred Mouse Strain

Roland D. Claranello, Jeffrey N. Dornbusch, and Jack D. Barchas
Science 18 February 1972: 789-790.
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Auditory Evoked Response: Meaningfulness of Stimuli and Interhemispheric Asymmetry

Y. Matsumiya, V. Tagliasco, C. T. Lombroso, and H. Goodglass
Science 18 February 1972: 790-792.
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Hippocampal Unit Activity during Classical Aversive and Appetitive Conditioning

Menahem Segal, John F. Disterhoft, and James Olds
Science 18 February 1972: 792-794.
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 Nuclear Magnetic Relaxation Time of Blood and Blood Velocity

J. Kumar, V. Kumar, and J. R. Singer
Science 18 February 1972: 794-795.
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 Absolute Dating Techniques

G. J. Wasserburg, J. C. Huneke, F. A. Podosek, Liaquat Husain, 0. A. Schaeffer, and J. F. Sutter
Science 18 February 1972: 795.
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 Leonard M. Rieser, President-Elect, 1972

Gerald Holton
Science 18 February 1972: 796-797.
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 AAAS Council Meeting, 1971

William Bevan
Science 18 February 1972: 798-799.
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 Report to the Association—1971

Athelstan Spilhaus and William Bevan
Science 18 February 1972: 800-803.
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 AAAS Officers, Committees, and Representatives for 1972

Science 18 February 1972: 804-808.
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 AAAS Audiotapes - New for 1972

Science 18 February 1972: 809.
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