Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We investigated some relationships between the hydrolysis rate with cellulase and the swelling degree of the cellulose fibers of different samples. The water retention value (WRV) determined by the centrifugal method was used as a measure of the swelling degree. A linear relationship was observed between the hydrolysi…
In the two modifications of TeO 2 and in the tellurites two limiting cases for the coordination of oxygen around tellurium are known: on the one hand a 3-coordination in the shape of a trigonal pyramid, and on the other hand a 4-coordination in the shape of a trigonal dipyramid with one of the corners of the equatoria…
Abstract A thermodynamic study was conducted of water vapor adsorption on four hydrophilic polymers (agar, carboxymethyl cellulose, gelatin, and maize starch) at 12 and 25°C. Monolayer coverage amounted, after correction for crystallinity, respectively, to 0.93, 1.46, 0.51, and 0.77 mol water/mol monomer. Evidence is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetoxication mechanisms. III. Scope and mechanism of the iron-catalyzed dealkylation of tertiary amine oxidesJ. P. Ferris, Roderick D. Gerwe, and G. R. GapskiCite this: J. Org. Chem. 1968, 33, 9, 3493–3498Publication Date (Print):September 1, 1968Publication History Publishe…
In the extremely interesting Jubilee article 'Electrons in metals and alloys' by Prof. H. Jones in the June 1968 issue of Physics Bulletin, I was disappointed to see that the electron diffraction patterns of CuAu alloys were described as 'Laue photographs', and that both were stated to be projections of the reciprocal…
Systematic infrared studies of a series of polyhexamethylene adipamides (nylon 66) have resulted in the assignment of two bands to the regularly folded polymer chain. Utilizing this assignment and long-period measurements by small-angle X-ray diffraction, a method has been developed to compare the amount of regular ch…
The principal emission from the salicylideneanilines, salicyclidene-2-aminoanthracene, and 2-hydroxynaphthylideneaniline is assigned as a fluorescence originating from a π, π* singlet state of a short-lived intermediate, cis†. The cis† arises as the first product of the photochemistry and is a species in which proton…
An investigation of failures of hard-drawn copper water pipes (phosphorus-deoxidised copper) in service due to pitting corrosion was conducted from November, 1962 to February, 1965. Fifteen cases were reported. All those about which information could be obtained came from hot water installations and occurred in water…
Cytolytic processes in posterior silk gland cells of the silkworm, Bombyx mori, during metamorphosis from larva to pupa have been studied. During this stage, the wet weight and the amounts of RNA and protein of the gland decrease rapidly and markedly, while the amount of DNA decreases slowly and slightly. The ultrastr…
The levels of eight enzymes from several different metabolic pathways were determined during growth and sporulation, as well as in the mature spore, of Bacillus subtilis. Three different patterns of development were observed. In one, the levels of DNA polymerase, adenylate kinase, and nucleoside phosphorylase closely…
The magnetic properties of a series of discrete trinuclear transition-metal complexes derived from tetradentate Schiff bases have been investigated over the temperature range 80°–400°K. The complexes contain the groupings of metals CuMCu where M is Cu(II), Ni(II), Co(II), Fe(II), and Mn(II), and the three metal atoms…
Studies of cathodic polarisation of steel in sulphate-reducing bacteria growing without sulphate metabolism, but in the presence or absence of chemically prepared suspensions of ferrous sulphide, indicate that two distinct mechanisms of depolarisation can occur. In addition to utilisation of polarising hydrogen by the…
The location of vinyl end groups in monolayer polyethylene crystals (specially prepared to have surfaces highly accessible to gaseous reactants) has been investigated by exposing the crystals to ozone and determining the extent of reaction by infrared spectroscopy. It was found that, for the type of crystals used, abo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic characterization of a new polymorph of metal-free phthalocyanineJames H. Sharp and Marcel LardonCite this: J. Phys. Chem. 1968, 72, 9, 3230–3235Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue 1 September…
Defect clusters are observed to form in copper and aluminium during examination at ∼20°C in a high voltage electron microscope when the voltage is greater than ∼500 kv and the beam current is high (0·1–0·4 μamps in a 5 μ spot). Experimental and theoretical considerations show that the damage is the result of the direc…
An electron optical scheme has been developed for a low energy electron gun in which the focal properties are independent of final electron energy or beam current over a wide range of these variables. The scheme includes focus-independent provisions for pulsing the beam and regulating the current. Constructional detai…
Hydrothermal synthesis studies in portions of the system CaO—P 2 O 5 –H 2 O—CO 2 –F have produced apatites with composition variations. The lattice constants of the apatites have been determined using computer analyses of x-ray powder diffraction data. By this method compositional fluctuations of a phase within a mixt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative Measurement of Void Content in Glass-Filament-Wound Composites and Correlation of Interlaminar Shear Strength with Void ContentE. J. Kohn, A. G. Sands, and R. C. ClarkCite this: Ind. Eng. Chem. Prod. Res. Dev. 1968, 7, 3, 179–183Publication Date (Print):Septembe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrong hydrogen bonds. IV. The B2H7- speciesWilbur G. Evans, Clive E. Holloway, Kamthorn Sukumarabandhu, and Darl H. McDanielCite this: Inorg. Chem. 1968, 7, 9, 1746–1748Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue…
Serpierite, Ca(Cu, Zn)4(on)6(SO4)2.3H20, crystallizes in the monoclinic system, space group C2/c, with a=22.186, b= 6.250, c=21.853 A, B= 113.36° and Z=8. The analysis of the crystal structure was carried out by the interpretation of the Patterson function and by three-dimensional Fourier syntheses and refined by the…