This journal provides immediate access to some articles. Volume 68(3); March 1971 Biological Sciences: Biochemistry Optical Activity of Human Lysozyme PMCID: PMC388978 Putrescine and Spermidine Biosynthesis in the Development of Normal and Anucleolate Mutants of Xenopus laevis PMCID: PMC388979 Light-Induced Electron-transfer Reactions between Chlorophyll a and Hydrogenated Pteridine Derivatives in Solution PMCID: PMC388983 Biochemical Studies on Adenovirus Multiplication, XIX. Resolution of Late Viral RNA Species in the Nucleus and Cytoplasm PMCID: PMC388987 Adenyl Cyclase as a Link between Photon Capture and Changes in Membrane Permeability of Frog Photoreceptors PMCID: PMC388988 Substrate Anchoring and the Catalytic Power of Enzymes PMCID: PMC388989 Control of Translation by the Conformation of Messenger RNA PMCID: PMC388991 The Leader Sequence from the 5′-Terminus to the A-Protein Initiation Codon in MS2-Virus RNA PMCID: PMC388995 The Mechanism of Protein Synthesis Activation After Fertilization of Sea Urchin Eggs PMCID: PMC388998 Inhibition of the Metabolism of 25-Hydroxycholecalciferol by Actinomycin D and Cycloheximide PMCID: PMC388999 Heme Binding and Transport—A Spectrophotometric Study of Plasma Glycoglobulin Hemochromogens PMCID: PMC389000 Compounds I of Catalase and Horse Radish Peroxidase: π-Cation Radicals PMCID: PMC389001 Mammalian Peptide Chain Termination, II. Codon Specificity and GTPase Activity of Release Factor PMCID: PMC389002 Electron Spin Resonance of Chlorophyll and the Origin of Signal I in Photosynthesis PMCID: PMC389003 The Question of Histidine Content in c-Type Cytochromes PMCID: PMC389004 Specific Transformylation of One Methionyl-tRNA from Cotton Seeding Chloroplasts by Endogenous and Escherichia coli Transformylases PMCID: PMC389007 The Carboxyl Transferase Component of Acetyl CoA Carboxylase: Structural Evidence for Intersubunit Translocation of the Biotin Prosthetic Group PMCID: PMC389010 On the Concept of Orbital Steering in Catalytic Reactions PMCID: PMC389011 The Gramicidin A Transmembrane Channel: A Proposed π(L,D) Helix PMCID: PMC389014 Absence of Histones from the Chromosomal Proteins of Fungi PMCID: PMC389015 The Yeast Phenylalanyl-Transfer RNA Synthetase Recognition Site: The Region Adjacent to the Dihydrouridine Loop PMCID: PMC389016 Direction of Chain Elongation in the Formation of Escherichia coli Ribosomal Protein PMCID: PMC389018 Biological Sciences: Botany Pathogenicity Resulting from Mutation at the b Locus of Ustilago maydis PMCID: PMC388981 Isolation of Glucanase-Containing Particles from Budding Saccharomyces cerevisiae PMCID: PMC389006 Biological Sciences: Genetics Cytological and Biochemical Correlation of Late X-Chromosome Replication and Gene Inactivation in the Mule PMCID: PMC388984 Biological Sciences: Immunology Expression of H-2 and Moloney Leukemia Virus-Determined Cell-Surface Antigens in Synchronized Cultures of a Mouse Cell Line PMCID: PMC388990 Amino Acid Sequences of Two Mouse Immunoglobulin Lambda Chains PMCID: PMC388996 Biological Sciences: Medical Sciences Effects of L-Dopa on Norepinephrine Metabolism in the Brain PMCID: PMC389012 Biological Sciences: Microbiology Use of Monkey-Mouse Hybrid Cells for the Study of the Cellular Regulation of Interferon Production and Action PMCID: PMC388994 Serum Factor Requirements of Normal and Simian Virus 40-Transformed 3T3 Mouse Fibroblasts PMCID: PMC389008 Biological Sciences: Physiology Kinetics of Insulin Release from the Perfused Rat Pancreas Caused by Glucose, Glucosamine, and Galactose PMCID: PMC388982 A Mechanochemical Mechanism for Muscle Contraction PMCID: PMC389017 Biological Sciences: Zoology Absence of Adaptive Modification in Developing Retinotectal Connections in Frogs after Visual Deprivation or Disparate Stimulation of the Eyes PMCID: PMC388980 Hour-Glass Behavior of the Circadian Clock Controlling Eclosion of the Silkmoth Antheraea pernyi PMCID: PMC388997 Chromosomal Aberrations and Mortality of X-Irradiated Mammalian Cells: Emphasis on Repair PMCID: PMC389013 Physical Sciences: Applied Physical Sciences Evidence of Widespread Effects of Cloud Seeding at Two Arizona Experiments PMCID: PMC389009 Physical Sciences: Astronomy Performance of an Automated Computerized Plate Scanner PMCID: PMC388977 Physical Sciences: Chemistry Effect of Pressure on the Electronic Structure of Ferric Hydroxamates and Ferrichrome A PMCID: PMC388985 Photocatalytic Production of Organic Compounds from CO and H2O in a Simulated Martian Atmosphere PMCID: PMC388992 Physical Sciences: Mathematics The Weierstrass-Laguerre Transform PMCID: PMC388986 Subordinate Quadratic Forms and Their Complementary Forms PMCID: PMC388993 Physical Sciences: Physics One- and Two-Fluid van der Waals Theories of Liquid Mixtures, II. 6:12 Molecules PMCID: PMC389005 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||