Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of Thorium Monophosphide, ThP1-x, and Phase Studies of the Partial System Th-ThPKarl A. Gingerich and Daniel W. WilsonCite this: Inorg. Chem. 1965, 4, 7, 987–993Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Publ…
Cotton fibers from bolls harvested at 5-day intervals beginning at 20 days after flowering and ending at 50 days ( when the bolls had opened on the plant) 'were preserved in three ways for study in the never-dned state. Preservation was accom plished in 70% aqueous ethanol, 50% aqueous dioxane, and by freezing. Measur…
Abstract Viscoelastic properties of unsaturated polyesters were investigated in the glass‐rubber transition region in relation to the temperature dependence of specific volume. Polyesters which are homologous with respect to crosslinking density were prepared by using mixtures of succinic and fumaric acid as the dibas…
Abstract The techniques involved in dynamic thermal gravimetric analysis are reviewed. Methods of studying overall kinetics of degradation, especially with respect to evaluation of order of reaction and overall activation energy, are outlined. Some applications to polymers such as Teflon and epoxide resins are describ…
Abstract Recrystallization of amorphous cellulose prepared by saponification of cellulose triacetate in an non‐aqueous medium was found to occur only at very high relative humidities, i.e., near 100%. At lower relative humidities the amount of recrystallization occurring was slight though significant. Correspondingly,…
Drastic decreases in the thermal conductivity upon deformation similar to those reported by Sproull, Moss, and Weinstock have been found in NaCl, KCl, and NaF crystals. Unexpected differences in the frequency dependence of the phonon—defect relaxation times lead to an investigation of whether point defects, created du…
1. Glucosamine 6-phosphate deaminase [2-amino-2-deoxy-d-glucose 6-phosphate ketol-isomerase (deaminating), EC 5.3.1.10] of Bacillus subtilis has been partially purified. Its K(m) is 3.0mm. 2. Extracts of B. subtilis contain N-acetylglucosamine 6-phosphate deacetylase (K(m) 1.4mm), glucosamine 1-phosphate acetylase and…
Journal of the Physical Society of Japan 58 (1989) pp. 3106'3110 Ising Model with Even-Bonds Plaquettes on the Square Lattice Tsuyoshi Horiguchi Journal of the Physical Society of Japan 67 (1998) pp. 2300'2305 Explicit KF-Percolation Transitions in 2D Strongly-Frustrated Spin Systems Hideo Ikeda and Yasuhiro Kasai Jou…
An electron spin resonance study of vanadyl phthalocyanine magnetically diluted in metal-free and zinc phthalocyanine salts, and in sulfuric acid solution, confirms the placement of the 3d unpaired electron in the dxy singlet orbital of the vanadium ion. An improved method of synthesis for vanadyl phthalocyanine which…
M easurem ents were m a de on r efractive index changes with h yd ro static pressures between 1 ba r a nd 1 kbar usin g the h elium yellow line . Thc ma te rials studies were: KBr NaCI, LiF, diamond, MgO, quartz, A120 3, a nd t hree silicate glasses. All t he materials increased in refractive index with pressure excep…
Abstract It has been shown that the introduction of a few stable crosslinks into the skin protein can greatly increase the resistance of the leather to deterioration by moist heat and perspiration. A method based on stress‐strain measurements has been developed for the determination of the number of crosslinks introdu…
A systematic study of quantum efficiencies and lifetimes has been carried out for the visible fluorescences of Pr3+ in single-crystal LaF3. An analysis of the results as a function of Pr3+ concentration is given in terms of a two-site model in which a Pr3+ ion can either be in an isolated site or in a site where it is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of Carbon Vapor. I. Reactions of Triatomic Carbon with OlefinsP. S. Skell, L. D. Wescott Jr., J.-P. Golstein, and R. R. EngelCite this: J. Am. Chem. Soc. 1965, 87, 13, 2829–2835Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Publi…
Diatoms usually undergo a decrease in size concomitant with cell division. Because the developmental and physiological faculties of diatoms are dependent on cell size, the ability to manipulate cell size would be valuable for experimental purposes. Although enlargement of cells usually can be obtained by auxospore for…
SUMMARY A number of commercial heparin preparations have been examined for the presence of amino acids. Heparin which had been prepared by use of mild methods essentially based on treat- ment with proteolytic enzymes, contained residual amino acids with serine as the main component. In some preparations serine was the…
A review is given of the various methods which are now available for the direct observation of lattice imperfections in crystals. After a brief historical introduction a summary of some of the more important properties of lattice imperfections is given, with particular emphasis on properties which allow the imperfecti…
Single crystals of Na 2 S 2 O 3• 5H 2 O were irradiated and examined, at room temperature, with an e.s.r. spectrometer. Two radicals are present: the species present in highest concentration is S 2 O 2 − ; the other species has not yet been identified.
Corrosion of iron in an aggressive medium containing sulfate and chloride ions has been completely inhibited by addition of minute amounts of the pertechnetate ion. Its effectiveness on the basis of mol concentration required under similar conditions is much greater than that of such widely-used inhibitors as the nitr…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePrinciples of the Theory of Solids.R. S. KnoxCite this: J. Am. Chem. Soc. 1965, 87, 14, 3288Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.acs.org/doi/10.1021/ja01092a079https://doi.org/10.1021/ja01092…
Oriented aggregates of ethylene glycol-montmorillonite were studied by x-ray diffractometer methods. Basal reflections, through the 00 14, provided the basis for structural analysis by Fourier and trial and error methods. On the basis of the intensity data, it is concluded that glycol molecules form a staggered, two-l…