Materials Literature
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The primary structure of human uromodulin, a 616-amino acid, 85-kilodalton glycoprotein with in vitro immunosuppressive properties, was determined through isolation and characterization of complementary DNA and genomic clones. The amino acid sequence encoded by one of the exons of the uromodulin gene has homology to t…
Nonuniform flux distributions in amorphous toroidal cores can result in anomalous eddy current losses. Amorphous toroidal cores were excited (by a sinusoidal magnetic flux) and the resulting core losses and local flux distributions measured. Though the overall core flux was sinusoidal, the local flux distribution was…
The wear rate of cast iron and the corrosion potential (Ecorr) and current (Icorr) were measured in sulphuric acid in order to study the mechanism of corrosive wear of cast iron. The corrosive wear rate of cast iron was found to reach a maximum at around 35 wt. percent sulphuric acid concentration and increase with lo…
Abstract In this study the apparent rate constant model was used to determine the mechanism of termination and other rate constants for free radical copolymerizations that are chemically controlled with no penultimate effect. The data required were the number average molecular weight and the conversion obtained at var…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyiodides of triethylenediamine: single-crystal resonance Raman spectra and x-ray structuresAndre D. Bandrauk, K. D. Truong, C. Carlone, and A. W. HansonCite this: J. Phys. Chem. 1987, 91, 8, 2063–2069Publication Date (Print):April 1, 1987Publication History Published onli…
Abstract The isotypic compounds SrPt 4 P 6 , SrPt 4 As 6 and BaPt 4 As 6 were found to crystallize with a Pyrite-type derivative structure (monoclinic, C2/c, Z = 4) in which one Sr or Ba atom per formula unit occupies the position of a P 2 or As 2 pair. BaPt 2 P 3 forms another Pyrite-type related structure (monoclini…
Reduced (4-O-methyl-D-glucurono)-D-xylan and nine methylglycosides related to this polysacharide were studied by dynamic and isothermal thermogravimetry. It could be stated from the results that the thermal stability of saccharides is increasing with increasing number of pyranose units. The models related to (4-O-meth…
Formation of fission gas bubbles heretofore has not been observed in uranium-aluminide fuels. Recent irradiations to record high burnups offered a possibility to determine the onset of fission gas bubble formation in this type of fuel. Present experimental evidence suggests that UAl2, UAl3, and UAl4 do not form fissio…
Abstract The activation energies for the racemization of the optically active diaryl selenoxides were estimated by the use of the 77Se NMR spectra of the diastereomeric diaryl selenoxides.
Abstract Successful new thermo‐crosslinking reactions of copolymers of various phenyl methacrylates by use of polyfunctional epoxy compounds were carried out in the film state at 100–150°C in presence of quaternary ammonium salts, quaternary phosphonium salts, tert ‐amines, or the crown ether dicyclohexyl‐18‐crown‐6/p…
Abstract Polymerization conditions of di‐ t ‐butyl fumarate and di‐trimethylsilyl fumarate were studied in detail. They cannot be polymerized by either anionic or coordination initiators, but radical and radiation polymerizations are successful. Characterization of poly(di‐ t ‐butyl fumarate), obtained thereby, with 1…
Mark E. Krejci, Rex L. Lowe, The Seasonal Occurrence of Macroscopic Colonies of Meridion circulare (Bacillariophyceae) in a Spring-Fed Brook, Transactions of the American Microscopical Society, Vol. 106, No. 2 (Apr., 1987), pp. 173-178
In a series of studies on the wettability of textile assemblies, apparent contact angles (ϕ) of wax-coated monofilament nylon and polyester mesh screens to water were measured to investigate the effect of the woven structure on the repellency of textiles. Expressions for the liquid-solid and liquid-air interfaces per…
As a model for a poly(methyl methacrylate ) chain which contains a head-to-head unit, the thermal degradation of tetramethyl 2,4,5,7-tetramethyloctane-2,4,5,7-tetracarboxylate has been studied. The meso compound degraded at 210º to give seven products which have been characterized by spectroscopic techniques and synth…
Measurements of the proton spin-lattice relaxation rate, ${T}_{1}^{\mathrm{\ensuremath{-}}1}$, reveal that the organic insulator copper phthalocyanine Cu(PC) is a highly one-dimensional Heisenberg system. ${T}_{1}^{\mathrm{\ensuremath{-}}1}$ diverges as ${\ensuremath{\omega}}^{\mathrm{\ensuremath{-}}1/2}$ down to 11.4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR characteristics of separated fractions of mesophase pitchesL. S. Singer, I. C. Lewis, D. M. Riffle, and D. C. DoetschmanCite this: J. Phys. Chem. 1987, 91, 9, 2408–2415Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1…
This paper deals with the evaluation of crystal lattice transformations and decrys tallization brought about in cotton fibers by chemical treatments, using x-ray diffiaction techniques. Suitable indices have been evolved to quantify cellulose II and total crys tallinity values, and cotton fibers subjected to widely di…
Abstract Two mixed oxides, La2NiO4−x and LaSrNiO4−x, had the K2NiF4 structure in the oxygen-pressure range from 58000 down to 130 Pa at 1173 K. The oxygen-vacancy concentration, x, in both La2NiO4−x and in LaSrNiO4−x at 1173 K was determined by thermogravimetric analysis in the oxygen-pressure range from 58000 to 1.3…
A study is presented of the optical order parameters and spectroscopic properties of 3′-hydroxyquinophthalone and 3,9-disubstituted perylene dyes in nematic liquid crystalline mixtures. The results of this study are discussed in terms of the effects of the dye structure on the order parameters. From the systematic var…
The carbon fiber/carbon matrix composites (C/C composites) are widely used in such systems as rocket nozzles, reentry shields of space vehicles, disk brakes, and heating elements. However, the unprotected C/C composites have very poor oxidation resistance even at temperature as low as 500°C. In this work, the oxidatio…