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This journal provides immediate access to some articles. Volume 39(12); December 1953 Astronomy Satellites, Comets, and Interplanetary Material PMCID: PMC1063930 Note on the Origin of the Asteroids PMCID: PMC1063931 Magellanic Clouds: VIII. On the Population Characteristics of the Two Clouds PMCID: PMC1063932 Magellanic Clouds: IX. The Nebulosities of the Small Coud PMCID: PMC1063933 Biochemistry The Enzymatic Synthesis of Porphyrins from Porphobilinogen PMCID: PMC1063934 Competition Among Ionic Species in Cation Activation of Enzymes PMCID: PMC1063935 Enzymatic Reactions in Purine Decomposition by Preparations of Clostridium Acidi-Urici PMCID: PMC1063936 Botany Effect of Amino Acids, Especially Asrartic and Glutamic Acid and Their Amides, on the Growth of Datura Stramonium Embryos in Vitro PMCID: PMC1063937 Chemistry The Behavior of Micellar Electrolytes in the Neighborhood of the Critical Concentration PMCID: PMC1063938 Engineering On the Effect of Pretwisting on Bending PMCID: PMC1063939 Genetics The Effect of Generation Time on the Delayed Appearance of Induced Mutants in Escherichia Coli PMCID: PMC1063940 The Relationship between Kappa and Paramecin in Paramecium Aurelia PMCID: PMC1063941 Cross Reactivation of Genetic Loci of T2 Bacteriophage after Decay of Incorporated Radioactive Phosphorus PMCID: PMC1063942 Effect of X-Rays on Chromatid Aberrations in Air and in Nitrogen PMCID: PMC1063943 Mathematics Spiral and Other Asymptotic Paths, and Paths of Complete Indetermination, of Analytic and Meromorphic Functions PMCID: PMC1063944 The Global Behavior of Differential Equations on N-Dimensional Manifolds PMCID: PMC1063945 Conjugate Nets, Conformal Structure, and Interior Transformations on Open Riemann Surfaces PMCID: PMC1063946 On a Differential-Geometric Method in the Theory of Analytic Stacks PMCID: PMC1063947 On a Theorem of Lefschetz and the Lemma of Enriques-Severi-Zariski PMCID: PMC1063948 On a New Problem Concerning Trinomial Congruences Involving Rational Integers PMCID: PMC1063949 National Academy of Sciences Vital Statistics of our Foreign Associates PMCID: PMC1063952 Physiology Mechanochemical Properties of Fibers of Surface-Spread Actomyosin PMCID: PMC1063950 Zoology Phosphomonoesterases in Reef-Building Corals PMCID: PMC1063951 Corrections Linear Parabolic Differential Equations of Arbitrary Order; General Boundary-Value Problems for Elliptic Equations PMCID: PMC1063953 Corrects: Linear Parabolic Differential Equations of Arbitrary Order; General Boundary-Value Problems for Elliptic Equations. Proc Natl Acad Sci U S A. 1953 March; 39(3): 185–190. Development and Genetics of a Sex-Influenced Trait in the Livers of Mice PMCID: PMC1063954 Corrects: Development and Genetics of a Sex-Influenced Trait in the Livers of Mice. Proc Natl Acad Sci U S A. 1953 August; 39(8): 811–817. Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||
