This journal provides immediate access to some articles. Volume 60(1); May 1968 Introduction to the symposium on the international biological program. PMCID: PMC539085 The international biological program and the science of ecology. PMCID: PMC539127 Adaptability and human genetics. PMCID: PMC539090 The biology of islands. PMCID: PMC539105 Human welfare and international cooperation. PMCID: PMC539122 Conservation, the federal government, and the international biological program. PMCID: PMC539126 ON STELLAR ROTATION PMCID: PMC539128 THE RESONATING-VALENCE-BOND THEORY OF SUPERCONDUCTIVITY: CREST SUPERCONDUCTORS AND THROUGH SUPERCONDUCTORS PMCID: PMC539129 ON THE CONVERGENCE OF APPROXIMANTS TO A MARKOV CHAIN, I PMCID: PMC539130 ON GENERALIZED STANDARD ALGEBRAS PMCID: PMC539131 SECTIONAL CURVATURES OF GRASSMANN MANIFOLDS PMCID: PMC539132 THEORETICAL DISTRIBUTION OF TWO-DIMENSIONAL PROJECTIONS IN ELECTRON-MICROSCOPIC SECTIONS PMCID: PMC539133 Nuclear magnetic resonance studies of the active site of carboxypeptidase A. PMCID: PMC539134 Nuclear magnetic resonance studies of the structure and binding sites of enzymes. II. Spectral assignments and inhibitor binding in hen egg-white lysozyme. PMCID: PMC539135 Electron paramagnetic resonance of chlorophyll-water aggregates. PMCID: PMC539086 Triplet-triplet energy transfer in proteins as a criterion of proximity. PMCID: PMC539087 Action of hydrogenated ergot alkaloids upon transmission to sweat glands in the cat. PMCID: PMC539088 The dependence of nerve membrane potentials upon extracellular ionic strength. PMCID: PMC539089 Growth control in cultured cells: selection of sublines with increased sensitivity to contact inhibition and decreased tumor-producing ability. PMCID: PMC539091 Streptococcal group-specific antibodies: occurrence of a restricted population following secondary immunization. PMCID: PMC539092 Localization of vitamin A in the eye of a pulmonate snail. PMCID: PMC539093 Extraretinal light perception in the sparrow. II. Photoperiodic stimulation of testis growth. PMCID: PMC539094 Evidence for the appearance of novel gene products during amphibian blastulation. PMCID: PMC539095 Formation of merodiploids in matings with a class of Rec- recipient strains of Escherichia coli K12. PMCID: PMC539096 Transduction and the clustering of genes in fluorescent Pseudomonads. PMCID: PMC539097 Proteins in dinosaur bones. PMCID: PMC539098 The structure of acid mucopolysaccharides produced by Hurler fibroblasts in tissue culture. PMCID: PMC539099 Genetic modification of energy-conserving systems in yeast mitochondria. PMCID: PMC539100 Physical conservation of parental cytoplasmic DNA through meiosis in Chlamydomonas reinhardi. PMCID: PMC539101 Structure-function relationships of protein polysaccharide complexes: specific ion-binding properties. PMCID: PMC539102 Psychedelic drugs: steric factors that predict psychotropic activity. PMCID: PMC539103 Sequential cleavage of dinucleotides from DNA by phage Sp3 DNAse. PMCID: PMC539104 Evidence for the steroid-induced accumulation of tyrosine-aminotransferase messenger RNA in the absence of protein synthesis. PMCID: PMC539106 De novo synthesis of myosin in a cell-free system. PMCID: PMC539107 SIZE AND STRUCTURAL VARIATIONS OF MITOCHONDRIAL DNA PMCID: PMC539108 Electron-microscopic visualization of deletion mutations. PMCID: PMC539109 The action of heat and ionizing radiation on the infectivity of isolated phi-X-174 DNA. PMCID: PMC539110 The generation of antihapten antibodies with electrophoretically homogeneous L chains. PMCID: PMC539111 Cohesive sites and helper phage function of P2, lambda, and 186 DNA's. PMCID: PMC539112 The activation of amino acids for biosynthesis of gramicidin S. PMCID: PMC539113 On the noncatalytic proteins of membrane systems. PMCID: PMC539114 Studies on polynucleotides. LXXXVII. The joining of short deoxyribopolynucleotides by DNA-joining enzymes. PMCID: PMC539115 A radioimmunoassay for thyrocalcitonin. PMCID: PMC539116 "Contact inhibition" of cell division in 3T3 cells. PMCID: PMC539117 On the initiation of transcription of the tryptophan operon in Escherichia coli. PMCID: PMC539118 The periodicity of RNA polymerase initiations: a new regulatory feature of transcription. PMCID: PMC539119 Cell-free protein synthesis directed by Q beta-RNA and by two specific fragments. PMCID: PMC539120 Studies of DNA replication in vivo. I. Isolation of the first intermediate of DNA replication in bacteria as single-stranded DNA. PMCID: PMC539121 The continued presence of quantasomes in ethylenediaminetetraacetate-washed chloroplast lamellae. PMCID: PMC539123 STUDIES ON POLYNUCLEOTIDES, LXXXIV. ON THE ROLE OF RIBOSOMAL SUBUNITS IN PROTEIN SYNTHESIS PMCID: PMC539124 Correction THE in vitro INDUCTION OF AN INCREASE IN CELL MULTIPLICATION AND CELLULAR LIFE SPAN BY THE WATER-SOLUBLE CARCINOGEN DIMETHYLNITROSAMINE PMCID: PMC539125 Corrects: The in vitro induction of an increase in cell multiplication and cellular life span by the water-soluble carcinogen dimethylnitrosamine. Proc Natl Acad Sci U S A. 1968 January; 59(1): 77–82. Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||