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The self‐association of chymotrypsinogen A at pH 8.1 and at ionic strength of 0.021 has been examined by means of sedimentation equilibrium. The data have been analyzed by several methods and results compared. Application of the older methods available in the literature indicate that the concentration dependence of mo…
This work used a conventional thermomechanical analyzer (TMA) to measure the depth of indentation at room temperature of elastomers and Finkin's equation to calculate Young's moduli of elastomers, which have been measured by Drutowski, from the radius of contact of an indentor on thin sheets of sample. Data obtained f…
The mineral brazilianite, NaAI3(PO4)2(OH)4, is monoclinic, space group P21/n, with a = 11.233 (6), b = 10142 (5), c=7-097 (4) ,& and fl=97.37 (2) A~. With Z = 4 the calculated density, 2.998 (4), compares well with the measured density, 2.98 (1) gcm -3. The structure was solved by direct phasing and Fourier techniques…
The characteristics of an accelerating lens system composed of three anodes in the scanning electron microscope are described. The main advantages of this accelerating lens system are that the working distance can be changed freely or the accelerating voltage can be changed over a wide range (about 0.3–100 kV) without…
Abstract A study was conducted of the anionic polymerization of a series of methyl‐ and/or phenyl‐substituted five‐membered cyclocarbosiloxanes. The polymerization was initiated by lithium n ‐butyldiphenylsilanolate in the presence of tetrahydrofuran. The rate of conversion of monomer to polymer was measured in an NMR…
The dynamic properties of the molecular model proposed by Maier-Saupe (MS) for nematic liquid crystals are investigated. It is shown that the model predicts diffusive optic soft modes, describing nematic-order-parameter fluctuations which condense at the isotropicnematic stability limit. Since the MS Hamiltonian in it…
90° ferroelectric domain boundaries were observed by direct transmission electron microscopy in single crystals of pure BaTiO3 and (Ba,Pb)TiO3 solid solutions. Domain-wall thickness measurements were made from electron image plates by a densitometer-trace-curve-fitting technique. Boundary widths varied from 50 to 150…
Abstract BaThO3 had an orthorhombic lattice (a=6.345Å, b=6.376Å, c=8.992Å) with four pseudomonoclinic perovskite units(a′=c′=4.498Å, b′=4.496Å, β=90°17′). Ba2(BaU)O6 was a tetragonal, ordered perovskite(a=b=6.286Å, c=8.972Å). Ahrens′ radius of octahedral Ba2+ in Ba2(BaU)O6 was evaluated to be 1.16Å via a lattice param…
The absorption and magnetic circular dichroism (MCD) spectra of a single crystal of [K(H2O)6][Al(Cr)(H2O)6](SO4)2, with an aluminium : chromium ratio of approximately 10 : 1, have been measured in the range 14 500–33 000 cm-1 at various temperatures between 5 and 300 K. An analysis of the temperature dependence of the…
Helium, deuterium, and neon permeability, diffusivity, and solubility have been measured for CGW-7740 glass. The results indicate that gas migration occurs primarily through the silica-rich phase. Reaction of deuterium with the glass structure is evident at temperatures exceeding 300°C. The activation energy associate…
An improved band structure of Pd calculated by the empirical pseudopotential method is used to compute the density of states and the reflectivity, R( omega ). The reflectivity of Pd with dipole matrix elements calculated by the actual wave functions is given for 0<or=h(cross) omega <or=10eV and is compared with measur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Infinite-Dilution Activity Coefficients for Predicting Azeotrope Formation at Constant Temperature and Partial Miscibility in Binary Liquid MixturesVincenzo BrandaniCite this: Ind. Eng. Chem. Fundamen. 1974, 13, 2, 154–156Publication Date (Print):May 1, 1974Publicatio…
Various types of insulators have been energized with ±250 kV dc voltage and exposed to natural conditions by the seaside continuously. Salt deposit density and flashover phenomenon of these insulators have been investigated extensively for about two years. According to the results obtained so far, the influence of dc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExistence of associated species in lanthanum (III) chloride-potassium chloride meltsVictor E. Maroni, Ellen J. Hathaway, and G. N. PapatheodorouCite this: J. Phys. Chem. 1974, 78, 11, 1134–1135Publication Date (Print):May 1, 1974Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of di-.mu.-chlorobis[dichloro(guaninium)copper(II)] dihydrate. Second determinationRobert F. Drake, Van H. Crawford, Nancy W. Laney, and William E. HatfieldCite this: Inorg. Chem. 1974, 13, 5, 1246–1249Publication Date (Print):May 1, 1974Publication Histo…
Synthetic crystals of silver iodide are shown to form polytypes other than the previously reported wurtzite-type β-AgI and sphalerite-type γ-AgI. Four new polytypes have been discovered and their layer sequences determined by X-ray diffraction. The constant of proportionality between percentage hexagonality and birefr…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation S. M. Curry, A. L. Schawlow; Measuring the Diameter of a Hair by Diffraction. Am. J. Phys. 1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence quenching of dicyanobis(1,10-phenanthroline)ruthenium(II) by cupric ion in aqueous solutions. Dynamic and static processesJ. N. Demas and J. W. AddingtonCite this: J. Am. Chem. Soc. 1974, 96, 11, 3663–3664Publication Date (Print):May 1, 1974Publication History P…
The optical constants of Se and CdTe have been measured in the far ir from 10 cm(-1) to 100 cm(-1) using Fourier transform spectroscopy. An oscillator model has been fit to the available data for both materials over the entire ir range from 10 cm(-1) to 10,000 cm(-1). Several three-phonon absorption peaks have been ob…
In this paper an experimental study is reported of the pure bending and recovering properties of wool plain-knitted fabrics for bending in the two principal directions of the fabric. The mechanisms of fabric bending were found to be relatively complex and were studied from both a geometrical and rheological point of v…