Materials Literature
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The changes in the structure of commercial polyethylene terephthalate yam, when it is textured on a spindle false- twist machine, have been studied over a range of heater temperatures and heater contact times. Compared to the un textured yarn, crystalline content increases on texturing, but crystallite orientation, bi…
Measurements have been made of the width of the dislocation loop-free zones formed around 〈100〉 tilt boundaries in quench-aged pure aluminium and some dilute aluminium solid solutions as a result of vacancy-loss to the boundary during cooling. The width is found to increase as the quench-rate decreases except for the…
Pangolagrass (Digitaria decumbens, Stent) and water hyacinth (Eichhornia crassipes, Mart) were ensiled and fed to sheep to compare voluntary feed intake and nutrient digestibility. Dry matter intake of pangolagrass silage was larger (P < .05) than for water hyacinth silage. Digestibility of dry matter, organic matter…
Abstract The optical absorption of (CH 3 NH 3 ) 2 CuCl 4 has been investigated at 300 K in the spectral range between 0.2 and 40 μm and down to 4.2 K between the optical absorption edge and 2.5 μm. Absorption has also been measured with polarized light, parallel or perpendicular to the crystal axes or a magnetic field…
An acoustic light modulator, using a liquid crystal (CBOOA) in nematic or smectic phase, is presented. It is shown that with good acoustical matching it is possible, in the nematic phase, to have a modulation of light from very low frequencies up to about 1 MHz, at the least. To the authors’ knowledge this is the firs…
Abstract The aminoalkoxysilanes, γ‐aminopropyltriethoxysilane and N‐aminoethyl‐γ‐ainopropyl‐trimethoxysilane, were chemically modified by ring‐opening addition of γ‐propanesultone. Surfaces coated with polymers from these new monomers have, at the surface, zwitterionic functions of sulfobetaines which are attached to…
Co films were deposited by electron-beam evaporation onto oxidized Si wafers. The resistivity was measured after annealing at temperatures up to 500 °C. The resistivity after deposition is about 8 μΩ cm and decreases to the bulk value on annealing. This occurs in two stages: 230–380 °C (stage A) and 410–430 °C (stage…
Cellulose microfibrils are viewed as imperfect array of elementary fibrils. We have investigated the possible defects in Valonia cellulose microfibrils, which are such that the microfibrils can be broken into elementary fibrils by deformation, but are not sufficient to allow for a small angle maximum corresponding to…
Dissociative excitation of CO2 by electron impact has been studied using the methods of translational spectroscopy and an angular distribution analysis. Earlier time-of-flight studies revealed two overlapping spectra, the slower of which has been attributed to metastable CO(a 3π) fragments. The fast peak is the focus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDensities and apparent molal volumes of some aqueous rare earth solutions at 25.deg.. III. Rare earth nitratesF. H. Spedding, L. E. Shiers, M. A. Brown, J. L. Baker, L. Guitierrez, L. S. McDowell, and A. HabenschussCite this: J. Phys. Chem. 1975, 79, 11, 1087–1096Publication…
The Rouse-Bueche-Zimm molecular theory of viscoelasticity has been extended to compute the retardation time spectra of block copolymers of various configurations and compositions. The basic assumption of the block copolymer model is that the effect of the presence of foreign blocks on the retardation spectrum is due e…
During in vivo maturation, and also during in vitro incubation with physiological buffers, native collagen fibers display a progressive increase in tensile strength and insolubility. Paralleling these physiologically important changes is a progressive loss of the reducible cross-links which initially join the triple-c…
Hair samples were collected from several socioeconomic and ethnic groups in Japan and from 2 groups (vegetarians vs nonvegetarians) in India. The samples were analyzed for the amount of total mercury and methylmercury. A large amount of mercury in the hair of molybdenum refinery workers who were exposed to mercury vap…
The presence of only one thiolase (EC 2.3.1.9) in wild-type Escherichia coli induced for enzymes of beta oxidation was demonstrated. A different thiolase was shown to be present in a mutant constitutive for the enzymes of butyrate degradation. The two thiolases were purified to near homogeneity by a simple two-step pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.sigma.- vs. .pi.-Bonded organoactinides. Synthesis and structural analysis of tris(.eta.5-cyclopentadienyl)-.eta.1-2-methylallyluranium(IV)Gordon W. Halstead, Edgar C. Baker, and Kenneth N. RaymondCite this: J. Am. Chem. Soc. 1975, 97, 11, 3049–3052Publication Date (Print):…
Periodic structures indicating discontinuous growth of shell wall plates have been observed in thin sections of shell and on the outer surface of shell plates of many species of operculate (Bourget, 1975). When sectioned and etched the shell plates appear to be composed of successive thin layers of shell material, eac…
The energy bands of the compound Cr${\mathrm{B}}_{2}$ have been calculated by using the Korringa-Kohn-Rostoker method in the muffin-tin-potential approximation. The bands near the Fermi level have mostly Cr $d$ character, and one of the bands gives rise to a very flat piece of Fermi surface perpendicular to the hexago…
The purpose of this paper is to inform experimenters of what can be done to predict from the Electromagnetic Theory the properties of gratings when their profile and the indices of the materials making them up are known. Four broad methods are discussed: analytic, semi-analytic, integral and differential methods.
Multiple forms of 7-alpha-hydroxysteroid dehydrogenase were detected in six of nine strains of Bacteroides fragilis. The enzymes differed with respect to pyridine nucleotide specificity, thermal stability, divalent metal cation requirement, and elution profilies from Sephadex G-200 columns. The nicotinamide adenine di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of silica supported chromium ions. III. Two-ligand complexes. Nitric oxide adsorptionA. Zecchina, E. Garrone, C. Morterra, and S. ColucciaCite this: J. Phys. Chem. 1975, 79, 10, 978–983Publication Date (Print):May 1, 1975Publication History Published online1 May 20…