Table of Contents

• Merle A. Tuve

N. A. S. Symposium on the Years of the Quiet Sun—IQSY: INTRODUCTORY REMARKS

• Martin A. Pomerantz

N. A. S. Symposium on the Years of the Quiet Sun—IQSY: THE IQSY AND SOLAR-TERRESTRIAL RESEARCH

• Herbert Friedman

N. A. S. Symposium on the Years of the Quiet Sun—IQSY: RADIATIONS FROM THE SUN

• Kenneth G. McCracken

N. A. S. Symposium on the Years of the Quiet Sun—IQSY: PARTICLES AND FIELDS IN THE INTERPLANETARY MEDIUM

• Brian J. O'Brien

N. A. S. Symposium on the Years of the Quiet Sun—IQSY: PARTICLES AND FIELDS IN THE MAGNETOSPHERE

• Francis S. Johnson

N. A. S. Symposium on the Years of the Quiet Sun—IQSY: DEVELOPMENTS IN UPPER ATMOSPHERIC SCIENCE DURING THE IQSY

• Linus Pauling

MAGNETIC-MOMENT EVIDENCE FOR THE POLYSPHERON STRUCTURE OF THE LIGHTER ATOMIC NUCLEI

• Ralph A. Alpher,
• George Gamow,
• and Robert Herman

THERMAL COSMIC RADIATION AND THE FORMATION OF PROTOGALAXIES

• J. R. Hϕegh-Krohn

PARTLY GENTLE PERTURBATION WITH APPLICATION TO PERTURBATION BY ANNIHILATION-CREATION OPERATORS

• W. J. Sweeney

A NONCOMPACT DIRICHLET NORM

• Joe Grosh,
• Mu Shik Jhon,
• Taikyue Ree,
• and Henry Eyring

SIGNIFICANT STRUCTURE THEORY OF ISOTOPE EFFECT

• Roy A. Scott,
• Garret Vanderkooi,
• Robert W. Tuttle,
• Peter M. Shames,
• and Harold A. Scheraga

MINIMIZATION OF POLYPEPTIDE ENERGY, III. APPLICATION OF A RAPID ENERGY MINIMIZATION TECHNIQUE TO THE CALCULATION OF PRELIMINARY STRUCTURES OF GRAMICIDIN-S

• Asao Nakamura
• and Oleg Jardetzky

SYSTEMATIC ANALYSIS OF CHEMICAL SHIFTS IN THE NUCLEA MAGNETIC RESONANCE SPECTRA OF PEPTIDE CHAINS, I. GLYCINE-CONTAINING DIPEPTIDES

• G. N. Reeke,
• J. A. Hartsuck,
• M. L. Ludwig,
• F. A. Quiocho,
• T. A. Steitz,
• and W. N. Lipscomb

THE STRUCTURE OF CARBOXYPEPTIDASE A, VI. SOME RESULTS AT 2.0-Å RESOLUTION, AND THE COMPLEX WITH GLYCYL-TYROSINE AT 2.8-Å RESOLUTION

• M R Bernfield
• and P E Fell

Separation of the proliferating and differentiating cell populations of cultured embryonic pancreatic epithelium

• C Ceccarini,
• R Maggio,
• and G Barbata

Aminoacyl-sRNA synthetases as possible regulators of protein synthesis in the embryo of the sea urchin Paracentrotus lividus

• D L Hartl,
• Y Hiraizumi,
• and J F Crow

Evidence for sperm dysfunction as the mechanism of segregation distortion in Drosophila melanogaster

• A Watanabe,
• I Tasaki,
• and L Lerman

Bi-ionic action potentials in squid giant axons internally perfused with sodium saltssalts

• C B Huggins,
• J Pataki,
• and R G Harvey

Geometry of carcinogenic polycyclic aromatic hydrocarbons

• H Niewisch,
• H Vogel,
• and G Matioli

Concentration, quantitation, and identification of hemopoietic stem cells

• K McIntosh,
• W B Becker,
• and R M Chanock

Growth in suckling-mouse brain of "IBV-like" viruses from patients with upper respiratory tract disease

• J D Regan
• and J S Cook

Photoreactivation in an established vertebrate cell line

• W Munyon,
• E Paoletti,
• and J T Grace, Jr

RNA polymerase activity in purified infectious vaccinia virus

• P M Knopf,
• R M Parkhouse,
• and E S Lennox

Biosynthetic units of an immunoglobulin heavy chain

• L Wofsy
• and D Michaeli

Affinity labeling of the anionic site of acetylcholinesterase

• C Corredor,
• K Brendel,
• and R Bressler

Studies of the mechanism of the hypoglycemic action of 4-pentenoic acid

• L M Sherwood

Similarities in the chemical structure of human placental lactogen and pituitary growth hormone

• M Sekiguchi
• and S Iida

Mutants of Escherichia coli permeable to actinomycin

• M Goulian,
• A Kornberg,
• and R L Sinsheimer

Enzymatic synthesis of DNA, XXIV. Synthesis of infectious phage phi-X174 DNA

• F G Liming, Jr,
• J N Herak,
• and W Gordy

Hydrogen addition radicals of stilbestrol, hexestrol, and benzestrol

• J Friedland
• and J W Hastings

Nonidentical subunits of bacterial luciferase: their isolation and recombination to form active enzyme

• M H Green,
• B Gotchel,
• J Hendershott,
• and S Kennel

Regulation of bacteriophage lambda DNA replication

• I Bekhor
• and L A Bavetta

Evidence for a low-molecular-weight collagen precursor

• B W O'Malley
• and P O Kohler

Studies on steroid regulation of synthesis of a specific oviduct protein in a new monolayer culture system

• A S Dion
• and E J Herbst

The localization of spermidine in salivary gland cells of Drosophila melanogaster and its effect on H3-uridine incorporation

• M G Rush
• and R C Warner

Multiple-length rings of phi-X-174 replicative form, II. Infectivity

• F E Young

Requirement of glucosylated teichoic acid for adsorption of phage in Bacillus subtilis 168

• T E Likover
• and C G Kurland

The contribution of DNA to translation errors induced by streptomycin in vitro

• M Young

Studies on the structural basis of the interaction of myosin and actin

• I G Wool
• and K Kurihara

Determination of the number of active muscle ribosomes: effect of diabetes and insulin

• S K Bose
• and R J Warren

In vitro stability of phage messenger ribonucleic acid

• W Gilbert
• and B Müller-Hill

The lac operator is DNA

• P Vassalli,
• B Lisowska-Bernstein,
• M E Lamm,
• and B Benacerraf

Studies on cell-free synthesis of rat immunoglobulins, II. Synthesis of immunoglobulin and of antibody to the dinitrophenyl hapten

• P Traub,
• K Hosokawa,
• G R Craven,
• and M Nomura

Structure and function of E. coli ribosomes, IV. Isolation and characterization of functionally active ribosomal proteins

• J J Holland,
• M W Taylor,
• and C A Buck

Chromatographic differences between tyrosyl transfer RNA from different mammalian cells

• R J Kassner
• and M D Kamen

The photoreduction of spinach ferredoxin in the presence of porphyrin and an electron donor

• J H Wang
• and L Parker

Pretransition-state protonation and the rate of chymotrypsin catalysis

• H P Ghosh
• and H G Khorana

Studies on polynucleotides, LXXXIV. On the role of ribosomal subunits in protein synthesis

• D W Misch
• and M S Misch

Dimethyl sulfoxide: activation of lysosomes in vitro

• W T Hsieh
• and J M Buchanan

Polymerization of nucleoside diphosphate with a manganese-dependent enzyme from Escherichia coli Q13

• W F Mommaerts

Conformational studies on the membrane protein of sarcotubular vesicles

• S Y Wang,
• M H Patrick,
• A J Varghese,
• and C S Rupert

Addendum: concerning the mechanism of formation of UV-induced thymine photoproducts in DNA

Interrelations between Hepatic Fatty Acid Oxidation and Gluconeogenesis: A Possible Regulatory Role of Carnitine Palmityltransferase

Electron Paramagnetic Resonance of Heme at Intermediate Oxidation States of Cytochrome c Oxidase