Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCondensed System LiF-NaF-ZrF4-Phase Equilibria and Crystallographic Data.R. E. Thoma, H. Insley, H. A. Friedman, and G. M. HebertCite this: J. Chem. Eng. Data 1965, 10, 3, 219–230Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published ini…
The absorption spectrum of polycrystalline and single‐crystal magnesium oxide was determined in the 4000 to 166 cm −1 spectral region. In the range 4000 to about 1100 cm −1 , the absorption coefficient of the polycrystalline MgO was higher than that of the single‐crystal MgO owing to scattering by the grain boundaries…
The vaporization rates in vacuum of hot‐pressed HfC, TaC, and solid solutions of these carbides in the range 2225° to 2725°C were determined by a Langmuir‐type method. A composition near 80TaC.ZOHfC (mole %) exhibited the lowest vaporization rate of the compositions within this pseudobinary system. Variations in initi…
The theory is based on the assumption that the paths of all the filaments in a continuous-filament yarn are identical, except for a displacement along, and rotation about, the yarn axis. The path of the single filament is characterized by a regular periodic migration between the axis and the periphery; the form of thi…
Intergranular corrosion of nonsensitized stainless steels is reviewed, with emphasis on corrosion experienced in nitric-dichromate solutions. Electrical resistance changes occurring during corrosion of Type 304 stainless steel in nitric-dichromate solutions are used to measure the rate of intergranular attack. Effects…
The general, linearized, coupled magnetoelastic equations for arbitrarily anisotropic, magnetically saturated insulators, which were derived in a previous paper, are specialized to the important case of a homogeneous, static biasing state. The equations applicable in the special case of a material in cubic class m3m a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscosity of Glass-Forming Solvent Mixtures at Low TemperaturesHina Greenspan and Ernst FischerCite this: J. Phys. Chem. 1965, 69, 7, 2466–2469Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://doi.org/10.1…
Abstract The sorption of boron by clay minerals from natural waters has been studied experimentally. The quantity of boron sorbed per unit weight of clay mineral is dependent on both the salinity and the boron content of the solution. Previous work has shown that illite is the best clay mineral sorbent, though kaolini…
B. K. Vainshtein Translated and Edited by E. Feigl and J. A. Spink Oxford: Pergamon Press. 1964. Pp. vi + 420. Price 100s. The analysis of crystal structure by electron diffraction, particularly by the use of Fourier methods, is a subject which was originally developed in Russia, notably by Vainshtein, Pinsker and Zvy…
Measurements of the thermal conductivity, using a steady-state technique, and of the specific heat, using a transient technique, have been performed between 4.5° and 1°K on commercial samples of polytetrafluoroethylene (Teflon), polychlorotrifluoroethylene (Kel-F), nylon, and three samples of polyethylene of varying d…
Abstract An explanation is presented to account for the deterioration of the mechanical properties at very low concentrations of absorbed oxygen. The induction time as measured by the oxygen absorption technique overestimates the time to failure with respect to the mechanical properties. Furthermore, it is shown that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophobic Bonding and Micelle Stability1Douglas C. Poland and Harold A. ScheragaCite this: J. Phys. Chem. 1965, 69, 7, 2431–2442Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.acs.org/doi/10.1021/…
Abstract The mineralogy of the clay fractions of two soil profiles representing the end-members of a catena developed on a glacial till derived from basic lavas has been determined. Particular attention has been given to the assessment of the nature of the amorphous inorganic material in the clay fraction of these soi…
The magnitude of the linear electro-optic effect at 5461 Å in single-crystal barium titanate has been determined in the temperature range from 5° to 120°C. The low-frequency or stress-free values were obtained for r42 and rc = r33 − (na/nc)3r13. The polarimetric measurement did not separate r33 from r13. The quantity…