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Table of Contents

September 01, 1956; vol. 42 no. 9

Biochemistry

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    A NERVE GROWTH-STIMULATING FACTOR ISOLATED FROM SNAKE VENOM
    Stanley Cohen and Rita Levi-Montalcini
    PNAS September 1, 1956 42 (9) 571-574; https://doi.org/10.1073/pnas.42.9.571
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    BACTERIAL PROTOPLASTS INDUCED BY PENICILLIN
    Joshua Lederberg
    PNAS September 1, 1956 42 (9) 574-577; https://doi.org/10.1073/pnas.42.9.574
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    HINDERED CIS ISOMERS OF VITAMIN A AND RETINENE: THE STRUCTURE OF THE NEO-b ISOMER
    William Oroshnik, Paul K. Brown, Ruth Hubbard, and George Wald
    PNAS September 1, 1956 42 (9) 578-580; https://doi.org/10.1073/pnas.42.9.578
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    ON THE SYNTHESIS OF ANTIBODY PROTEIN IN VITRO
    Donald F. Steiner and H. S. Anker
    PNAS September 1, 1956 42 (9) 580-586; https://doi.org/10.1073/pnas.42.9.580
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    PRODUCTION OF PROTOPLASTS OF ESCHERICHIA COLI BY LYSOZYME TREATMENT
    Norton D. Zinder and William F. Arndt
    PNAS September 1, 1956 42 (9) 586-590; https://doi.org/10.1073/pnas.42.9.586

Chemistry

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    ION ASSOCIATION IN AQUEOUS SOLUTIONS OF 1-1 ELECTROLYTES AT 25°
    Mario Azzarri and Charles A. Kraus
    PNAS September 1, 1956 42 (9) 590-596; https://doi.org/10.1073/pnas.42.9.590
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    THE OPTICAL ROTATORY DISPERSION OF SIMPLE POLYPEPTIDES. I
    William Moffitt and Jen Tsi Yang
    PNAS September 1, 1956 42 (9) 596-603; https://doi.org/10.1073/pnas.42.9.596

Engineering

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    ISOTROPIC MATERIALS WHOSE DEFORMATION AND DISTORTION ENERGIES ARE EXPRESSIBLE BY SCALAR INVARIANTS
    T. Y. Thomas
    PNAS September 1, 1956 42 (9) 603-608; https://doi.org/10.1073/pnas.42.9.603

Genetics

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    CYTOLOGICAL DEMONSTRATION OF THE HELICAL STRUCTURE OF GIANT CHROMOSOMES
    William Hovanitz
    PNAS September 1, 1956 42 (9) 609-613; https://doi.org/10.1073/pnas.42.9.609
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    HETEROCARYOSIS AND PROTOPLASMIC INCOMPATIBILITY IN NEUROSPORA CRASSA
    Laura Garnjobst and James F. Wilson
    PNAS September 1, 1956 42 (9) 613-618; https://doi.org/10.1073/pnas.42.9.613
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    THE ORIENTATION AND EXTENT OF GENE TRANSFER IN ESCHERICHIA COLI
    P. D. Skaar and Alan Garen
    PNAS September 1, 1956 42 (9) 619-624; https://doi.org/10.1073/pnas.42.9.619

Mathematics

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    A PROPERTY OF SPECIAL JORDAN ALGEBRAS
    A. A. Albert
    PNAS September 1, 1956 42 (9) 624-625; https://doi.org/10.1073/pnas.42.9.624
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    ON A CLASS OF FUNCTIONAL EQUATIONS OF MODULAR TYPE
    Richard Bellman
    PNAS September 1, 1956 42 (9) 626-629; https://doi.org/10.1073/pnas.42.9.626
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    ON THE PRINCIPLE OF INVARIANT IMBEDDING AND PROPAGATION THROUGH INHOMOGENEOUS MEDIA
    Richard Bellman and Robert Kalaba
    PNAS September 1, 1956 42 (9) 629-632; https://doi.org/10.1073/pnas.42.9.629
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    ON MULTIPLICATIVE IDEMPOTENTS OF A POTENT SEMIRING
    Samuel Bourne
    PNAS September 1, 1956 42 (9) 632-638; https://doi.org/10.1073/pnas.42.9.632
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    GENERALIZED RESOLUTIONS OF THE IDENTITY FOR CLOSED SYMMETRIC ORDINARY DIFFERENTIAL OPERATORS
    Earl A. Coddington
    PNAS September 1, 1956 42 (9) 638-642; https://doi.org/10.1073/pnas.42.9.638
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    CAUCHY'S PROBLEM FOR LINEAR DIFFERENTIAL EQUATIONS WITH CONSTANT COEFFICIENTS
    Leon Ehrenpreis
    PNAS September 1, 1956 42 (9) 642-646; https://doi.org/10.1073/pnas.42.9.642
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    A UNIFIED THEORY OF GENERAL RELATIVITY OF GRAVITATION AND ELECTROMAGNETISM. II
    Luther P. Eisenhart
    PNAS September 1, 1956 42 (9) 646-650; https://doi.org/10.1073/pnas.42.9.646
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    SINGULAR INTEGRAL EQUATIONS FOR DIFFERENTIAL FORMS ON RIEMANNIAN MANIFOLDS
    J. J. Kohn
    PNAS September 1, 1956 42 (9) 650-653; https://doi.org/10.1073/pnas.42.9.650
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    MEASURES OF THE VALUE OF INFORMATION
    John McCarthy
    PNAS September 1, 1956 42 (9) 654-655; https://doi.org/10.1073/pnas.42.9.654
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    DIOPHANTINE EQUATIONS IN CERTAIN RINGS
    H. S. Vandiver
    PNAS September 1, 1956 42 (9) 656-665; https://doi.org/10.1073/pnas.42.9.656

Physics

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    A FUNDAMENTAL THEORY OF SUPERCONDUCTIVITY
    Kenneth S. Pitzer
    PNAS September 1, 1956 42 (9) 665-670; https://doi.org/10.1073/pnas.42.9.665
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    CONVERGENT APPROACH TO THE THEORY OF ELEMENTARY PARTICLE INTERACTIONS
    I. E. Segal
    PNAS September 1, 1956 42 (9) 670-676; https://doi.org/10.1073/pnas.42.9.670

Physiology

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    TEMPERATURE INDEPENDENCE IN A UNICELLULAR “CLOCK”
    Victor G. Bruce and Colin S. Pittendrigh
    PNAS September 1, 1956 42 (9) 676-682; https://doi.org/10.1073/pnas.42.9.676
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    INFLUENCE OF PROTEIN AND CALCIUM ADDITIONS TO ALREADY ADEQUATE DIET
    Henry C. Sherman, Constance S. Pearson, Mary E. R. Bal, Andrea McCarthy, and Caroline Sherman Lanford
    PNAS September 1, 1956 42 (9) 682-687; https://doi.org/10.1073/pnas.42.9.682
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    MEASUREMENT OF IMPOSED VOLTAGE GRADIENT ADEQUATE TO MODULATE NEURONAL FIRING
    C. A. Terzuolo and T. H. Bullock
    PNAS September 1, 1956 42 (9) 687-694; https://doi.org/10.1073/pnas.42.9.687

ZoÖlogy

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    IN VITRO AND IN VIVO EFFECTS OF A NERVE GROWTH-STIMULATING AGENT ISOLATED FROM SNAKE VENOM
    Rita Levi-Montalcini and Stanley Cohen
    PNAS September 1, 1956 42 (9) 695-699; https://doi.org/10.1073/pnas.42.9.695
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    ON TIME LAGS IN EQUATIONS OF GROWTH
    P. J. Wangersky and W. J. Cunningham
    PNAS September 1, 1956 42 (9) 699-702; https://doi.org/10.1073/pnas.42.9.699

Correction

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    COURSE OF PRODUCTION OF AN ISOANTISERUM EFFECTING TUMOR HOMOGRAFT SURVIVAL IN MICE
    PNAS September 1, 1956 42 (9) 702;
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