Materials Literature
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1. Oxalacetase from Asperigillus niger was found to be an inducible enzyme, the induction being dependent not only on neutralisation of the acidic growth medium but also on the presence of carbonate. An explanation is proposed. 2. Three methods were established for the quantitative determination of oxalacetase activit…
Polycrystalline samples of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Pb}}_{x}{\mathrm{Mn}}_{1\ensuremath{-}y}^{57}\mathrm{Fe}_{y}{\mathrm{O}}_{3}$ with $0.20<x<0.45$ and $0.03<~y<~0.17$ have been made and characterized by x-ray and wet chemical analysis. Earlier, it had been established that manganites wit…
In the albite-orthoclase-nepheline-kalsilite-water system the assemblage analcite-melt (±nepheline albite and orthoclase) can only exist in the pressure range 5 to 13 Kbars and at temperatures between 640 and 600 °C. Primary igneous analcite will have a similar restricted PT range which probably means that interstitia…
A classical model for Raman and fluorescent scattering by molecules embedded in particles is extended to the case where the particle consists of concentric spheres made of different dielectric materials.
Abstract Ein einfaches Verfahren zum Testen des Aufkohlungsverhaltens von hochhitzebeständigen CrNiFe‐Stählen ist die Glühung von Proben, die in Kohlenstoff eingepackt werden. Es wird gezeigt, daß auf Grund der thermodynamischen Bedingungen während dieser Untersuchung zwischen 900 und 1050°C auf der Probenoberfläche e…
Abstract Torsional braid analysis (TBA) (∼0.3 Hz) and differential thermal analysis (DTA) data are presented for the temperature for the region 0–200°C for two series of atactic polystyrenes with narrow molecular weight distributions: (a) anionic series, M̄ n = 600–2×10 6 , M̄ w /M̄ n ≃ 1.1; (b) fractionated thermal s…
A native oxidation of by anodization in mixed solutions of glycol and water (AGW) is described. A detailed comparison between the AGW process and anodization in aqueous solutions (AAS) shows the basic importance of ( i ) the simultaneous oxide dissolution during growth and ( ii ) the initial electrochemical active‐pas…
Liquid crystals are complex organic systems exhibiting a variety of interesting phase transitions. In this paper, work is reviewed in two areas: (1) lattice dynamics of nematogenic crystals as the crystal-nematic liquid crystal phase transition is approached, and (2) vibrational spectroscopic changes at the gel-liquid…
Abstract To clarify the effects of salt and alkali on Fe 2+ and Mn 2+ equilibria in submerged soils, Maahas clay (a Haplustalf) was amended with NaCl and NaHCO 3 to give initial electrical conductivities of 5, 10, 20, and 25 mmhos/cm at 25°C and exchangeable Na percentages of 5, 10, 15, 20, and 25, respectively. The a…
Abstract Melt rheology and its time‐temperature dependence have long been known to be fundamental properties associated with satisfactory expansion characteristics in vinyl foam. Since much is known about the relationship between rheology and material variables like polymer morphology and system composition, adequate…
Kinetic results of the crystal growth and dissolution of seed crystals of calcium fluoride and magnesium fluoride, obtained conductimetrically and potentiometrically, indicate that both processes are controlled by a surface reaction mechanism. An initial reaction surge in the case of magnesium fluoride is consistent w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExtrinsic circular dichroism in twisted nematic mesophasesF. D. Saeva and G. R. OlinCite this: J. Am. Chem. Soc. 1976, 98, 10, 2709–2711Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published inissue 1 May 1976https://pubs.acs.org/doi/10.1…
Abstract The synthesis, processing characteristics, thermal propers, and adhesive and composite properties of polyphenvlqmnoxahnes are briefly reviewed. In addition, new high molecular weight soluble carbonate/phenylquinoxaline copolymers from the cyclopolycondensation of aromatic bis( o ‐diamines) with a bis(benzilyl…
Abstract The presence of a high temperature (> T g ) relaxation in amorphous polystyrene has been investigated further. In the previous work, 1 the techniques of differential thermal analysis (DTA) and torsional braid analysis (TBA) were employed to study polystyrene as a function of “monodisperse” molecular weight…
M e th ods of abso lut e a nd re lati ve radi a nl a nd q ua ntum effi c ie ncy m eas ure me nts a re described fo r ultrav iole t , vis ibl e , ca thod e-ray, a nd xray exc ita tio ns. Da ta o n so me s ta nd a rd lumin esce nt ma te ri a ls a re gjve n.
Abstract The dispersion of surface plasmon‐polaritons and their associated fluctuation densities and electric fields are calculated for a spatially dispersive semi‐infinite electron plasma, with, parameters appropriate to the metallic state. The model is hydrodynamic and the electron density is assumed to be uniform a…
A theoretical analysis is performed to determine the intrinsic variables which affect the green strength of ideal dry bodies held together by organic binders. The parameters which influence strength (i.e. types of bonds formed, the amount of binder, the density of the ceramic, the packing density, and the cohesive or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChanges in lysozyme due to reactions with peroxidizing methyl linoleate in a dehydrated model systemJoseph Kanner and Marcus KarelCite this: J. Agric. Food Chem. 1976, 24, 3, 468–472Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published i…
The citric acid‐hydrogen peroxide‐water system has been developed for preferential etching of through photoresist masks. Etching rates depend strongly on the composition of the solution and on the crystal orientation of , with the rates in the order (111)B > (100) > (111)A. Flat‐bottomed holes were obtained for all co…
Expressions are derived for the estimation of the variance and the covariance in the deformation electron density qo/k - qc, for a centrosymmetric crystal structure. The uncertainty in the calculated density qc depends strongly on the distance to the nuclei. The uncertainty in the observed density qo is fairly constan…