Materials Literature
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The dynamic mechanical property of the vitreous body was studied as functions of frequency and temperature. The data at different temperatures were found to be superposable onto a single set of master relaxation curves. It was found that the shape of the composite master relaxation curves of the vitreous body resemble…
Solid-state Si and Al NMR, using high-resolution techniques, have been used to examine the dehydroxylation of the 2:1 phyllosilicate mineral pyrophyllite. Si results are consistent with the maintenance of the 2:1 layer structure in the dehydroxylate phase and provide data on chemical shift/structure variation in sheet…
The crystallization of leucine aminopeptidase from hog kidney is reported for the first time. The crystals which diffract to 4-A resolution have the space group P2(1)2(1)2(1) (a = 186.3 A, b = 223.2 A, and c = 80.5 A) and contain four hexamers per unit cell, or one per asymmetric unit. Electron micrographic images of…
This paper reports an experimental study of a meandering water stream upon an inclined smooth hydrophobic surface. It was found that the sinuosity (ratio of the total stream length to the length of the projection of the stream on the line of maximum slope of the surface) increases with both increasing discharge rate a…
The crystallization of disordered surface layers on highly oriented pyrolytic graphite (HOPG) has been studied by Rutherford backscattering spectrometry and channeling techniques. Disordered layers (∼1000–3000 Å thick) are produced on the surface of HOPG by the implantation of various ions. The disordered layers are r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline ordering in solutions of semiflexible macromolecules with rotational-isomeric flexibilityA. R. Khokhlov and A. N. SemenovCite this: Macromolecules 1984, 17, 12, 2678–2685Publication Date (Print):December 1, 1984Publication History Published online1 May 200…
Histidine enriched in 15N in the imidazole nitrogens was incorporated into the catalytic triad of alpha-lytic protease, and high-resolution solid-state 15N NMR spectra of lyophilized enzyme powders were recorded. The lyophilized powders were prepared from aqueous solutions with pH values ranging from 4.9 to 9.3. The b…
Abstract The previously reported method for the preparation of tri‐ O ‐benzylcellulose was applied to the preparation of various tri‐O‐substituted cellulose ethers. By this method, in which a mixture consisting of SO 2 , diethylamine (DEA), and dimethylsulfoxide (DMSO) and powdered sodium hydroxide were used as a cell…
Abstract The isothermal macrokinetic equation of polymer crystallization has been generalized to cover nonisothermal situations as well. The process of nonisothermal crystallization of poly(caproamide) has been studied experimentally. It is shown that the macrokinetic equation of the autocatalytic type can be used to…
Novel rechargeable battery cells have been constructed using a reduced form of the conducting organic polymer, polyacetylene, as the anode, the inorganic intercalating material, titanium disulfide as the cathode, and either 1.0 M LiClO 4 in THF or 1.0 M NaPF 6 in THF as the nonaqueous electrolyte. A feasibility study…
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Leakage currents in new and degraded (typically at twice rated voltage, 125°C) ZSU and X7R types Of multilayer ceramic (MLC) capacitors show both ohmic and space charge limited current behavior. The near 3/2 power voltage characteristic (la V3/2) of new devices can be attributed to electron emission from electrode poi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNegative activation energies and curved Arrhenius plots. 3. Hydroxyl + nitric acid and hydroxyl + peroxynitric acidJohn J. Lamb, Michael Mozurkewich, and Sidney W. BensonCite this: J. Phys. Chem. 1984, 88, 25, 6441–6448Publication Date (Print):December 1, 1984Publication His…
Fibroin is normally composed of one H chain (350 kd) and one L chain (25 kd) which are connected by disulfide bond(s). However, the small amount of fibroin secreted into the lumen of the posterior silk gland of the Nd(2) (naked pupa) mutant does not contain L chain, although L chain mRNA is present and L chain is synt…
Abstract A self‐seeding technique, coupled with isothermal crystallization, was used to prepare isotactic polypropylene specimens of varying spherulite size, but of constant crystallinity and lamellar thickness. The latter quantities were also varied by changing the isothermal crystallization temperature. The electric…
The bidirectional hydrogenase from Clostridium pasteurianum W5 is an iron-sulfur protein containing approximately 12 Fe atoms and 12 labile sulfides. We have studied oxidized samples of the enzyme with Mössbauer and electron nuclear double resonance (ENDOR) spectroscopy to elucidate the nature of the center that gives…
A root-finding algorithm for the solution of the eigenvalue equation linked with the theoretical study of lossy lamellar gratings is outlined. The computation time seems to be shorter than required when using a method proposed by Botten et al. (1981). The agreement is found to be excellent.
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The a.c. conductivity of binary V2O5-P2O5 glasses containing 40, 50, 60 and 70mol% V2O5 has been measured at temperatures between 100 and 423 K, and for frequencies up to 100 MHz. The results are interpreted in terms of Long's polaron hopping model. The polaron parameters calculated from the above model appear reasona…
Abstract It is proposed that titanium‐derived coupling agents react with free protons at the inorganic interface to form organic monomolecular layers on the inorganic surface, which causes inorganic/organic phase compatibilization resulting in new composite property, catalysis, adhesion, and rheology performance stand…