Nuclear and Radiochemistry
"Nuclear and Radiochemistry." Nuclear Science and Engineering, 21(4), pp. 584–585
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Ultraviolet light‐induced change in collagen macromolecules
Abstract Viscosity measurements and calculated rotary diffusion constants show that collagen undergoes photopolymerization when irradiated with ultraviolet light of 2537 A. Fibril formation at the same time is inhibited. The results are correlated with the aromatic amino acid content of the dangling peptides protrudin…
Migration of Fibers in Yarns
is given in Table IV.As already indicated, features such as a random continuous filament structure with low binder content, crimp hetween bonds, and high filament separation combine to give unique products.They result in some unasual performance characteris- tics and permit new combinations among properties such as te…
EXPERIMENTAL OBSERVATIONS ON THE FLOTATION OF MARINE DIATOMS. I. THALASSIOSIRA CF. NANA, THALASSIOSIRA ROTULA AND NITZSCHIA SERIATA
The influence of cell age, size, and shape and mode of colony formation on diatom sinking rates was investigated in 25 experiments with Thalassiosira cf. nana Lohmann, Thalassiosira rotula Meunier and Nitzschia seriata Cleve. The settling experiments were conducted in 45 ml of 32‰ seawater at 15C using a glass settlin…
CARBONATE EQUILIBRIA: A GRAPHIC AND ALGEBRAIC APPROACH1
Graphic solutions for a wide variety of problems in carbonate equilibrium can be obtained if one uses the total carbonate carbon and alkalinity as abscissa and ordinate. At any point on such a diagram the carbonate system is completely defined and the pH, carbon dioxide pressure, bicarbonate concentration, and carbona…
Theoretical determination of sterically allowed conformations of a polypeptide chain by a computer method
Abstract A mathematical method has been developed, together with a digital computer program for its evaluation, for the determination of possible conformations of a polypeptide chain for any given amino acid sequence. Allowed conformations were required to satisfy predetermined criteria regarding the locations of pote…
Phototropy (or Photochromism)
ADVERTISEMENT RETURN TO ISSUEPREVArticlePhototropy (or Photochromism)Richard Exelby and Roger GrinterCite this: Chem. Rev. 1965, 65, 2, 247–260Publication Date (Print):April 1, 1965Publication History Published online1 May 2002Published inissue 1 April 1965https://pubs.acs.org/doi/10.1021/cr60234a005https://doi.org/10…
The Macromolecular Chemistry of Gelatin.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Macromolecular Chemistry of Gelatin.Peter H. von HippelCite this: J. Am. Chem. Soc. 1965, 87, 8, 1824Publication Date (Print):April 1, 1965Publication History Published online1 May 2002Published inissue 1 April 1965https://pubs.acs.org/doi/10.1021/ja01086a059https://doi.…
On the theory of ferroelectricity and anharmonic effects in crystals
A microscopic theory of ferroelectricity is developed in which the temperature dependence of the normal modes of vibration arises from the anharmonic interactions between those normal modes. The conditions for the stability of the crystal are discussed and detailed expressions given for the physical properties of both…
Oxidation‐Reduction Equilibria in Molten Na 2 O.2SiO 2 Glass
The oxidation‐reduction equilibria in molten glasses having a soda/silica ratio of 1/2 and containing small amounts of variable‐valence ions of the transition elements titanium, vanadium, iron, cobalt, and nickel, the post‐transition elements tin and antimony, and the rare‐earth element cerium were obtained by equilib…
Optical absorption features associated with paramagnetic nitrogen in diamond
A survey of the optical and E.P.R. absorption in a large number of diamonds revealed that most natural diamonds contain substitutional nitrogen exclusively in non-paramagnetic, platelet form. These diamonds are classified as Type I a. A small group of transparent natural diamonds contain dispersed, paramagnetic nitrog…
Aromatic polypyromellitimides from aromatic polyamic acids
Abstract Aromatic diamines react with pyromellitic dianhydride in solvents such as dimethyl‐acetamide to form solutions of high molecular weight polyamic acids. These soluble polymers can be converted to insoluble aromatic polyimides. The aromatic polyimides exhibit zero strength temperatures above 700°C. and possess…
Complexes Derived from Strong Field Ligands. XIX. Magnetic Properties of Transition Metal Derivatives of 4,4',4",4'''-Tetrasulfophthalocyanine
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes Derived from Strong Field Ligands. XIX. Magnetic Properties of Transition Metal Derivatives of 4,4',4",4'''-TetrasulfophthalocyanineJames H. Weber and Daryle H. BuschCite this: Inorg. Chem. 1965, 4, 4, 469–471Publication Date (Print):April 1, 1965Publication Histor…
The mechanical fatigue limit for rubber
Abstract Investigations of the dynamic cut growth behavior of vulcanized rubbers indicate that there is a minimum tearing energy at which mechanical rupture of chains occurs. The limiting value is characteristic of each vulcanizate, but is in the region of 0.05 kg./cm. The mechanical fatigue limit, below which the num…
Carbametallic Boron Hydride Derivatives. I. Apparent Analogs of Ferrocene and Ferricinium Ion
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbametallic Boron Hydride Derivatives. I. Apparent Analogs of Ferrocene and Ferricinium IonM. Frederick Hawthorne, Donald C. Young, and Patrick A. WegnerCite this: J. Am. Chem. Soc. 1965, 87, 8, 1818–1819Publication Date (Print):April 1, 1965Publication History Published o…
The Occurrence of Metastable Tetragonal Zirconia as a Crystallite Size Effect
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Occurrence of Metastable Tetragonal Zirconia as a Crystallite Size EffectRonald C. GarvieCite this: J. Phys. Chem. 1965, 69, 4, 1238–1243Publication Date (Print):April 1, 1965Publication History Published online1 May 2002Published inissue 1 April 1965https://pubs.acs.org…
The Isoelectric Points of Solid Oxides, Solid Hydroxides, and Aqueous Hydroxo Complex Systems
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Isoelectric Points of Solid Oxides, Solid Hydroxides, and Aqueous Hydroxo Complex SystemsGeorge A. ParksCite this: Chem. Rev. 1965, 65, 2, 177–198Publication Date (Print):April 1, 1965Publication History Published online1 May 2002Published inissue 1 April 1965https://pub…
Hopping Conduction in NiO
Received 15 February 1965DOI:https://doi.org/10.1103/PhysRevLett.14.497©1965 American Physical Society
Polymerization of δ‐valerolactone and preparation of a thermostable derivative from its polyester
Abstract The kinetics of the polymerization of δ‐valerolactone initiated with ethylene glycol or monoethanolamine has been studied. An activation energy of 6.4 kcal./mole was obtained, and the mechanism of polymerization was also discussed. Though the produced polymer, a polyester with two alcoholic end‐groups, is eas…
Knight Shift Anisotropy in Scandium and Yttrium and Nuclear Quadrupole Coupling in Scandium
The anisotropic Knight shift of the ${\mathrm{Sc}}^{45}$ and ${\mathrm{Y}}^{89}$ nuclear magnetic resonances (nmr) in polycrystalline scandium and yttrium metal, respectively, has been observed and measured at room temperature by means of the magnetic field dependence of the \textonehalf{} \ensuremath{\leftrightarrow}…