Mechanical properties of a glassy epoxide polymer: Effect of molecular weight between crosslinks
Trademark of Shell Chemical Co. The material is essentially the diglycidyl
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Biochemical Studies of Bacterial Sporulation and Germination
RNA synthesis, one of the early events in spore germination, is underway by the 2nd min. During the first 10 min of germination, RNA synthesis can proceed in the absence of exogenous nutrients at the expense of previously existing RNA. Salvage pathways for bases, nucleosides, and nucleotides are operative during this…
High‐temperature pyrolysis of poly(vinyl chloride): Gas chromatographic‐mass spectrometric analysis of the pyrolysis products from PVC resin and plastisols
Abstract A pyrolysis–gas chromatographic–mass spectrometric technique for analyzing the pyrolysis products from polymers in an inert atmosphere is described. Initial studies encompassing the pyrolysis of poly(vinyl chloride) homopolymer and a series of PVC plastisols (based on o ‐phthalate esters) have provided a comp…
Principles of electron structure research at atomic resolution using conventional electron microscopes for the measurement of amplitudes and phases
An electron microscope equipped with conventional electron optics can be used as a `diffractometer' for structure research on individual aperiodic objects. The resolution limit of the electron microscope is not the resolution limit of the `diffractometer' and electron structure research with atomic resolution is possi…
Effect of oxide additions on the polymorphism of tantalum pentoxide. III. ""Stabilization"" of the low temperature structure type
Th e " low te mperature stru cture type" of Ta, O. has bee n found to occur in two di stin c t forms with th e lowes t te mp e rature form hav in g a unit cell 14 tim es th e s ub ce ll a nd an inte rm ed ia ,e te mlJe ra ture form with a unit ce ll 11 tim es the subcell. Th e two t ypes form inte rm ediate partially…
Selective Dissolution and Differential Infrared Spectroscopy for Characterization of 'Amorphous' Constituents in Soil Clays
Abstract Poorly crystalline inorganic materials were removed from soil clays of different origin and mineral composition by successive treatments with sodium dithionite, 2 % Na 2 CO 3 and 0·5 N NaOH. Techniques are described whereby difference spectra representing the infrared absorption of the materials removed by th…
The structure of bacilysin and other products of Bacillus subtillis
1. Mass spectra of the trimethylsilyl derivative and the methyl ester of the N-trifluoroacetyl derivative of bacilysin indicated that the antibiotic had a molecular weight of 270. Several peaks in the spectrum of the methyl ester were consistent with the presence of an N-terminal alanine residue in the molecule. 2. Th…
Cooperative Dynamic Jahn-Teller Effect. I. Molecular Field Treatment of Spinels
A theory of cubic-to-tetragonal transformations occurring in spinels containing octahedrally coordinated ($B$ site) ${d}^{9}$ and ${d}^{4}$ transition-metal ions in high concentration is developed. The problem is treated in the spirit of the molecular field approximation. For each Jahn-Teller (JT) susceptible ion in t…
Reduction of Electromigration in Aluminum Films by Copper Doping
We have found that the lifetime of aluminum films subjected to high current densities at elevated temperatures can be increased by the addition of copper. Previous studies have indicated that the failure mechanism is a combination of electromigration-induced phenomena, including nucleation and growth of voids, which a…
Spin label studies of oriented smectic liquid crystals (a model system for bilayer membranes)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin label studies of oriented smectic liquid crystals (a model system for bilayer membranes)Joachim SeeligCite this: J. Am. Chem. Soc. 1970, 92, 13, 3881–3887Publication Date (Print):July 1, 1970Publication History Published online1 May 2002Published inissue 1 July 1970http…
I.R. Study of Alkyl-Ammonium Vermiculite Complexes
Abstract Two octyl-ammonium vermiculite complexes with different 001 periodicities have been studied by i.r. spectroscopy. In each case i.r. spectroscopy affords information on the orientation of the — NH 3 + groups and the strength of the hydrogen bond between these groups and the silicate oxygen surfaces. Also a per…
Excitons
An exciton is a quantum of electronic excitation energy travelling in the periodic structure of a crystal; it is electrically neutral and hence its movement through the crystal gives rise to the transportation of energy but not charge. This is a concise description of the ideal exciton. The authors give a more physica…
Pyrolysis and combustion of cellulose. I. Effects of triphenyl phosphate in the presence of nitrogenous bases
Abstract The ability of selected phosphorus‐containing compounds and nitrogen‐containing compounds to act as flame retardants for cotton cellulose was investigated using flame tests, thermal gravimetric analysis (TGA), and differential thermal analysis (DTA). The effectiveness of the organophosphorus compounds was fou…
Ruthenium complex having both linear and bent nitrosyl groups
ADVERTISEMENT RETURN TO ISSUEPREVArticleRuthenium complex having both linear and bent nitrosyl groupsCortlandt G. Pierpont, Donald G. Van Derveer, William Durland, and Richard EisenbergCite this: J. Am. Chem. Soc. 1970, 92, 15, 4760–4762Publication Date (Print):July 1, 1970Publication History Published online1 May 200…
A Study of Weathering in a Soil Derived from a Biotite-Hornblende Rock
Abstract The weathering of biotite in a sedentary soil profile developed on biotitehornblende- rock near Rehiran, Inverness-shire has been investigated by optical, X-ray, chemical, infrared and differential thermal methods. In the C horizon a direct transformation to hydrobiotite was observed. This involves oxidation…
Thermodynamic studies of the assembly in vitro of native collagen fibrils
Measurements of the solubility of calf-skin tropocollagen in neutral phosphate buffers in the temperature range 20-37 degrees C show that native collagen fibril formation is an endothermic process made thermodynamically favourable by a large positive entropy of precipitation associated with structural changes in the s…
Magnetization changes induced by stress in a constant applied field
Measurements have been made of magnetization curves obtained by applying stresses to various polycrystalline magnetic materials in the presence of a small, constant, magnetic field. The materials examined were nickel, mild steel, and both isotropic and cube textured silicon iron. Residual stray fields were carefully c…
Some thermodynamic aspects of polymer adhesion
Abstract Recently developed techniques permit the estimation of the surface free energy of polymers and the separation of this free energy into dispersion and hydrogen‐bonding components. These techniques have been used to calculate the thermodynamic reversible work of adhesion of a vinylidene chloride copolymer coati…
Electronic densities of states from x-ray photoelectron spectroscopy
In x-ray photoe lectro n spectrosco py (XPS), a sample is exposed to low energy x rays (a pp rox im ately keY), and th e res ultant photoelectrons a re analyzed with hi gh precis ion for kin eti c energy. Aft er co rrection for in e las ti c scatt erin g, th e measured ph otoe lectron spectrum s hould refl ect th e va…
ANNUAL REVIEW Solids Mixing
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTANNUAL REVIEW Solids MixingL. T. Fan, S. J. Chen, and C. A. WatsonCite this: Ind. Eng. Chem. 1970, 62, 7, 53–69Publication Date (Print):July 1, 1970Publication History Published online1 May 2002Published inissue 1 July 1970https://pubs.acs.org/doi/10.1021/ie50727a009https://…