Table of Contents

• Arnold S. Rubin
• and Albert H. Coons

Specific Heterologous Enhancement of Immune Responses

• W. D. Biggar,
• B. Holmes,
• and R. A. Good

Opsonic Defect in Patients with Cystic Fibrosis of the Pancreas

• M. G. Hanna, Jr.,
• R. W. Tennant,
• and J. H. Coggin, Jr.

Suppressive Effect of Immunization with Mouse Fetal Antigens on Growth of Cells Infected with Rauscher Leukemia Virus and on Plasma-Cell Tumors

• M. Hatanaka,
• T. Kakefuda,
• R. V. Gilden,
• and E. A. O. Callan

Cytoplasmic DNA synthesis Induced by RNA Tumor Viruses

• Jan Cerny,
• Robert F. McAlack,
• Walter S. Ceglowski,
• and Herman Friedman

Divergence between Immunosuppression and Immunocompetence during Virus-Induced Leukemogenesis

• Henry Erying,
• Betsy J. Stover,
• and Russell A. Brown

The Dynamics of Life, V. Applying the Steady-State Theory of Mutations to Human Cancer

• L. Eidels
• and M. J. Osborn

Lipopolysaccharide and Aldoheptose Biosynthesis in Transketolase Mutants of Salmonella typhimurium

• Thomas Douša,
• Oscar Hechter,
• Irving L. Schwartz,
• and Roderich Walter

Neurohypophyseal Hormone-Responsive Adenylate Cyclase from Mammalian Kidney

• Olga Greengard
• and Henry K. Dewey

The Prematurely Evoked Synthesis of Liver Tryptophan Oxygenase

• Richard B. Goldberg
• and Erwin Chargaff

On the Control of the Induction of β-Galactosidase in Synchronous Cultures of Escherichia coli

• I. Björk,
• F. A. Karlsson,
• and I. Berggård

Independent Folding of the Variable and Constant Halves of a Lambda Immunoglobulin Light Chain

• Giovanni Rovera,
• John Farber,
• and Renato Baserga

Gene Activation in WI-38 Fibroblasts Stimulated to Proliferate: Requirement for Protein Synthesis

• Young S. Kim,
• Jose Perdomo,
• Agustin Bella, Jr.,
• and Judith Nordberg

N -Acetyl-D-Galactosaminyltransferase in Human Serum and Erythrocyte Membranes

• Y. Aloni
• and G. Attardi

Symmetrical In Vivo Transcription of Mitochondrial DNA in HeLa Cells

• Joseph Bryan
• and Leslie Wilson

Are Cytoplasmic Microtubules Heteropolymers?

• I. Haruna,
• Y. H. Itoh,
• K. Yamane,
• T. Miyake,
• T. Shiba,
• and I. Watanabe

Isolation and Properties of RNA Replicases Induced by SP and FI Phages

• Anthony A. Infante
• and Ralph Baierlein

Pressure-Induced Dissociation of Sedimenting Ribosomes: Effect on Sedimentation Patterns

• W. Ford Doolittle
• and Norman R. Pace

Transcriptional Organization of the Ribosomal RNA Cistrons in Escherichia Coli

• Sigrid S. Thach
• and Robert E. Thach

Translocation of Messenger RNA and “Accommodation” of fMet-tRNA

• Juan Modole Ll,
• Bartolomé Cabrer,
• Andrea Parmeggiani,
• and David V Azquez

Inhibition by Siomycin and Thiostrepton of Both Aminoacyl-tRNA and Factor G Binding to Ribosomes

• D. J. Brunswick
• and Barry S. Cooperman

Photo-Affinity Labels for Adenosine 3′:5′-Cyclic Monophosphate

• Dietmar Richter,
• Fritz Lipmann,
• Adela Tarragó,
• and Jorge E. Allende

Interaction of Eukaryote Initiator Methionyl-tRNA with the Eukaryote Equivalent of Bacterial Elongation Factor T and Guanosine Triphosphate

• R. G. Crystal,
• D. A. Shafritz,
• P. M. Prichard,
• and W. F. Anderson

Initial Dipeptide Formation in Hemoglobin Biosynthesis

• Eva Bartels,
• Norbert H. Wassermann,
• and Bernard F. Erlanger

Photochromic Activators of the Acetylcholine Receptor

• Michael A. Venis

Stimulation of RNA Transcription from Pea and Corn DNA by Protein Retained on Sepharose Coupled to 2,4-Dichlorophenoxyacetic Acid

• Pierre Freychet,
• Jesse Roth,
• and David M. Neville, Jr.

Insulin Receptors in the Liver: Specific Binding of [ 125 I]Insulin to the Plasma Membrane and Its Relation to Insulin Bioactivity

• Nina V. Fedoroff
• and Norton D. Zinder

Structure of the Poly(G) Polymerase Component of the Bacteriophage f2 Replicase

• Nicholas W. Seeds

Biochemical Differentiation in Reaggregating Brain Cell Culture

• M. J. Leibowitz
• and R. L. Soffer

Modification of a Specific Ribosomal Protein Catalyzed by Leucyl, Phenylalanyl-tRNA:Protein Transferase

• John W. Daly,
• Isabella Karle,
• Charles W. Myers,
• Takashi Tokuyama,
• James A. Waters,
• and Bernhard Witkop

Histrionicotoxins: Roentgen-Ray Analysis of the Novel Allenic and Acetylenic Spiroalkaloids Isolated from a Colombian Frog, Dendrobates histrionicus

• Günter Blobel

Isolation of a 5S RNA-Protein Complex from Mammalian Ribosomes

• L. S. Lerman

A Transition to a Compact Form of DNA in Polymer Solutions

• J. S. Parks,
• M. Gottesman,
• K. Shimada,
• R. A. Weisberg,
• R. L. Perlman,
• and I. Pastan

Isolation of the gal Repressor

• S. P. Mahadik
• and P. R. Srinivasan

Stimulation of DNA-Dependent RNA Synthesis by a Protein Associated with Ribosomes

• D. W. Urry,
• M. C. Goodall,
• J. D. Glickson,
• and D. F. Mayers

The Gramicidin A Transmembrane Channel: Characteristics of Head-to-Head Dimerized π (L,D) Helices

• Stephen Lien,
• Anthony San Pietro,
• and Howard Gest

Mutational and Physiological Enhancement of Photosynthetic Energy Conversion in Rhodopseudomonas capsulata

• Michael I. Page
• and William P. Jencks

Entropic Contributions to Rate Accelerations in Enzymic and Intramolecular Reactions and the Chelate Effect

• Frederick T. Wall

Alternative Derivations of the Statistical Mechanical Distribution Laws

• Piero A. Temussi
• and Murray Goodman

Conformational Transition in Oligopeptides: An NMR Spectroscopic Study

• Florante A. Quiocho,
• George N. Reeke, Jr.,
• Joseph W. Becker,
• William N. Lipscomb,
• and Gerald M. Edelman

Structure of Concanavalin A at 4 Å Resolution

• Joel D. Pincus

The Spectrum of Seminormal Operators

• K. O. Friedrichs
• and P. D. Lax

Systems of Conservation Equations with a Convex Extension

• Gert K. Pedersen

The “Up-Down” Problem For Operator Algebras

• Samuel D. Balk

Stimulation of the Proliferation of Chicken Fibroblasts by Folic Acid or a Serum Factor(s) in a Plasma-Containing Medium

• Terrell L. Hill
• and Yi-Der Chen

On the Theory of Ion Transport Across the Nerve Membrane, II. Potassium Ion Kinetics and Cooperativity (with x = 4)

• Robert J. Lefkowitz
• and Edgar Haber

A Fraction of the Ventricular Myocardium That Has the Specificity of the Cardiac Beta-Adrenergic Receptor

• Bin G. Kang
• and Stanley P. Burg

Rapid Change in Water Flux Induced by Auxins

• Peter Albersheim
• and Anne J. Anderson

Proteins from Plant Cell Walls Inhibit Polygalacturonases Secreted by Plant Pathogens

• J. A. DrPaolo,
• P. J. Donovan,
• and R. L. Nelson

X-Irradiation Enhancement of Transformation by Benzo(a)Pyrene in Hamster Embryo Cells

• Alfred G. Knudson, Jr.,
• Nicola Di Ferrante,
• and John E. Curtis

Effect of Leukocyte Transfusion in a Child with Type II Mucopolysaccharidosis

• Avram Goldstein,
• Louise I. Lowney,
• and B. K. Pal

Stereospecific and Nonspecific Interactions of the Morphine Congener Levorphanol in Subcellular Fractions of Mouse Brain

• P. Hwang,
• H. Guyda,
• and H. Friesen

A Radioimmunoassay for Human Prolactin

• Larry Eron
• and Ricardo Block

Mechanism of Initiation of Repression of In Vitro Transcription of the Lac Operon of Escherichia coli

• Alexander Tomasz,
• Eva Zanati,
• and Richard Ziegler

DNA Uptake during Genetic Transformation and the Growing Zone of the Cell Envelope

• Gérard Orth,
• Philippe Jeanteur,
• and Odile Croissant

Evidence for and Localization of Vegetative Viral DNA Replication by Autoradiographic Detection of RNA·DNA Hybrids in Sections of Tumors Induced by Shope Papilloma Virus

Molecular characteristics of some carcinogenic hydrocarbons

• Frederick Seitz

A Tribute to the Life and Work of Hugh L. Dryden

• Herbert Friedman

Symposium on Energy for the Future—Problems and Prospects

• Edward E. David, Jr.

Initiatives for the Future of Energy

• Manson Benedict

Electric Power from Nuclear Fission

• R. F. Post

Fusion Power

• Rolf Eliassen

Power Generation and the Environment

Members of the National Academy of Sciences