This journal provides immediate access to some articles. Volume 67(4); December 1970 Article National Academy Of Sciences Autumn Meeting PMCID: PMC283458 Biological Sciences: Biochemistry Evolution and the Need for Ascorbic Acid PMCID: PMC283405 Model for the Action of Hemoglobin PMCID: PMC283409 Mechanism and Stereochemistry of 5-Dehydroquinate Synthetase PMCID: PMC283410 Differences between the Ribonucleic Acids of Transforming and Nontransforming Avian Tumor Viruses PMCID: PMC283411 Protein Chain Initiation by Methionyl-tRNA in Wheat Embryo PMCID: PMC283412 Photo-Affinity Labeling of Specific Acetylcholine-Binding Sites on Membranes PMCID: PMC283413 Amino Acid Incorporation by Isolated Rat Liver Mitochondria during Liver Regeneration PMCID: PMC283414 Translational Repression in the Arginine System of Escherichia coli PMCID: PMC283415 Evidence for an Extended Active Center in Elastase PMCID: PMC283420 Steroidal Free Radicals as Possible Intermediates in the Biosynthesis of C19-16-Steroids PMCID: PMC283423 Adenosine Triphosphate: Glutamine Synthetase Adenylyltransferase of Escherichia coli: Two Active Molecular Forms PMCID: PMC283424 Specificity of mRNA Binding Factor in Eukaryotes PMCID: PMC283427 RNA-Dependent DNA Polymerase Activity in Five RNA Viruses: Divalent Cation Requirements PMCID: PMC283428 Reversal of Malignant Transformation by Tumor DNA PMCID: PMC283435 T4 Endonuclease Involved in Repair of DNA PMCID: PMC283437 On the State of the Iron and the Nature of the Ligand in Oxyhemoglobin PMCID: PMC283438 Cell-Free Hemoglobin Synthesis in Beta-Thalassemia PMCID: PMC283439 Bovine Parathyroid Hormone: Amino Acid Sequence PMCID: PMC283440 Messenger and Heterogeneous Nuclear RNA in HeLa Cells: Differential Inhibition by Cordycepin PMCID: PMC283442 Possible Role of Microtubules in Thyroid Secretion PMCID: PMC283445 Ribosomal Proteins, XIII. Molecular Weights of Isolated Ribosomal Proteins of Escherichia coli PMCID: PMC283446 Abnormal DNA Patterns in Animal Mitochondria: Ethidium Bromide-Induced Breakdown of Closed Circular DNA and Conditions Leading to Oligomer Accumulation PMCID: PMC283449 The Rolling Circle for ϕX DNA Replication, II. Synthesis of Single-Stranded Circles PMCID: PMC283450 Glycyl-tRNA Synthetase: An Oligomeric Protein Containing Dissimilar Subunits PMCID: PMC283454 Biological Sciences: Botany Contemporaneous Disequilibrium, a New Hypothesis to Explain the „Paradox of the Plankton” PMCID: PMC283416 An In Vitro System That Simulates Plant Cell Extension Growth PMCID: PMC283432 Biological Sciences: Genetics Mutation and Recombination of Bacteriophage Lambda: Effect of Ultraviolet Radiation PMCID: PMC283418 Temperature-Dependent Properties of Cells Transformed by a Thermosensitive Mutant of Polyoma Virus PMCID: PMC283426 DNA-Induced Transformation in Drosophila: Evidence for Transmission without Integration PMCID: PMC283436 Regulation of Specific Functions of Glial Cells in Somatic Hybrids, II. Control of Inducibility of Glycerol-3-Phosphate Dehydrogenase PMCID: PMC283441 The SV40 Pseudovirus: Its Potential for General Transduction in Animal Cells PMCID: PMC283443 Neutral Amphiplasty and Regulation of the Cell Cycle in Crepis Herbs PMCID: PMC283444 Uptake of Transfer Ribonucleic Acid by Normal and Leukemic Cells PMCID: PMC283451 Identical Linear Order of Chromosomes in Both Gametes of the Acoel Turbellarian Polychoerus carmelensis: A Preliminary Note PMCID: PMC283452 Biological Sciences: Immunology Suppression of Immunoglobulin G Synthesis as a Result of Antibody-Mediated Suppression of Immunoglobulin M Synthesis in Chickens PMCID: PMC283448 Biological Sciences: Medical Sciences Cell Density-Dependent Changes of Glycolipid Concentrations in Fibroblasts, and Loss of This Response in Virus-Transformed Cells PMCID: PMC283421 Leukemia Virus Activation in Chronic Allogeneic Disease PMCID: PMC283447 Biological Sciences: Microbiology Affinity Labeling of the Heavy and Light Chains of a Myeloma Protein with Anti-2,4-Dinitrophenyl Activity PMCID: PMC283408 Recovery of a New Virus from Apparently Normal Chick Cells by Infection with Avian Tumor Viruses PMCID: PMC283429 The N-Terminal Amino Acid Sequence of Two Avian Leukosis Group Specific Antigens PMCID: PMC283430 Biological Sciences: Physiology Determination of Arterial Blood Flow by Percutaneously Introduced Flow Sensors in an External Magnetic Field, I. The Method PMCID: PMC283425 S100 Brain Protein: Correlation with Behavior PMCID: PMC283453 Biological Sciences: Zoology Ecological Consequences of Island Colonization by Southwest Pacific Birds, II. The Effect of Species Diversity on Total Population Density PMCID: PMC283417 Physical Sciences: Applied Mathematical Sciences Current Induced in a Plasma by a Penetrating Electron Beam PMCID: PMC283407 Physical Sciences: Chemistry Nuclear Magnetic Resonance Spectroscopy. A Stereospecific 3JCF Coupling in the Low-Temperature 13C Nmr Spectrum of 1,1-Difluorocyclohexane PMCID: PMC283406 Configuration Interaction in the Calculation of Oscillatory and Rotatory Intensities of Nonplanar π-Electronic Systems PMCID: PMC283419 Application of the Chloro Ketal Claisen Reaction to the Total Synthesis of Squalene. Experimental Details PMCID: PMC283431 A Short Stereoselective Synthesis of Cecropia Juvenile Hormone. Experimental Details PMCID: PMC283434 Physical Sciences: Mathematics Embedding Trees in the Rationals PMCID: PMC283422 Physical Sciences: Physics One- and Two-Fluid van der Waals Theories of Liquid Mixtures, I. Hard Sphere Mixtures PMCID: PMC283433 Corrections Sensitive Criteria For the Critical Size For Helix Formation in Oligopeptides PMCID: PMC283455 Corrects: SENSITIVE CRITERIA FOR THE CRITICAL SIZE FOR HELIX FORMATION IN OLIGOPEPTIDES. Proc Natl Acad Sci U S A. 1969 October; 64(2): 444–450. Low Temperature and Chloramphenicol Induction of Respiratory Deficiency in a Cold-Sensitive Mutant of Saccharomyces cerevisiae PMCID: PMC283456 Corrects: Low Temperature and Chloramphenicol Induction of Respiratory Deficiency in a Cold-Sensitive Mutant of Saccharomyces cerevisiae. Proc Natl Acad Sci U S A. 1970 September; 67(1): 52–58. Mechanixm of Carcinogenesis By RNA Tumor Viruses, I. An RNA-Dependent DNA Polymerase In Murine Sarcoma Viruses PMCID: PMC283457 Corrects: Mechanism of Carcinogenesis by RNA Tumor Viruses, I. An RNA-Dependent DNA Polymerase in Murine Sarcoma Viruses. Proc Natl Acad Sci U S A. 1970 September; 67(1): 385–393. Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||