Materials Literature
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Europium(II1) and gadolinium(II1) hexafluoroacetylacetonates, M(hfac),, form stable bis adducts with nitronyl nitroxides (2- R-4,4,5,5-tetramethyl-4,5-dihyd1rHo-- imidazolyl-1-oxy13 -oxide, NITR; R = phenyl, ethyl). The magnetic properties of Gd- (hfac),(NITPh), were investigated in the range 1.1-300 K, while all the…
A ruthenium heteropolyanion, SiRu(H2O)W11O395–, has been synthesized which catalyses the liquid phase oxidation of alkanes and alkenes with various primary oxidants including potassium persulphate, sodium periodate, t-butyl hydroperoxide, and iodosylbenzene; the activity and selectivity vary with the oxidant used.
The assessment of the polymorphic composition of calcium carbonate precipitates is important for understanding the mechanism of their formation at conditions of environmental or technological interest. A simple and accurate method is presented, based on infrared spectroscopy, for the quantitative analysis of calcium c…
Blood compatibility of regenerated silk fibroin was ecamined by in vivo blood tests. In vivo tests were made by a method of peripheral vein indelling suture. The coating of sample fibroin on the polyester suture was made by casting either from aqueous or from formic acid solution. The fibroin-coated sutures from aqueo…
The paper shows how a new frequency-dependent impedance formula, derived on the assumption of a solid homogeneous core, may be adapted to permit calculation of the self and mutual impedances of coil sections on a practical transformer core. Experimental measurements, in comparison with calculated values, show that the…
Mammary galactosyltransferase and alpha lactalbumin are the two protein components of lactose synthase which catalyze the transfer of galactose from UDP-gal to glucose in the presence of divalent cations. Recent studies suggest that alpha lactalbumin may have a broader function in modifying cell surface carbohydrates…
Raman spectra of paratellurite, tellurite and pure TeO2 glass were measured. The normal vibration of paratellurite and tellurite was analyzed. The spectrum of pure TeO2 glass were deconvoluted into symmetric Gaussian functions. The normal vibrations of paratellurite are exactly described as combined representations of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ionically crosslinkable polyphosphazene: poly[bis(carboxylatophenoxy)phosphazene] and its hydrogels and membranesHarry R. Allcock and Sukky KwonCite this: Macromolecules 1989, 22, 1, 75–79Publication Date (Print):January 1, 1989Publication History Published online1 May 20…
Collagen undergoes progressive browning with aging and diabetes characterized by yellowing, fluorescence and crosslinking, the cause of which remains unelucidated. As an initial step towards understanding the mechanism(s) of insolubilization of collagen in aging, the major fluorophores/chromophores from the insoluble…
The rate constants for the quenching of the excited states of metal ions and complexes in homogeneous fluid solution are reported in this compilation. Values of kq for dynamic, collisional processes between excited species and quenchers have been critically evaluated, and are presented with the following information,…
The charge-storage mechanism and the design of the ultracapacitor are described. Based on a ceramic with an extremely high specific surface area and a metallic substrate, the ultracapacitor provides extremely high energy densities and exhibits low ESR (equivalent series resistance). The combination of low ESR and extr…
The methionine analog norleucine was produced during the synthesis of bovine somatotropin by Escherichia coli strain W3110G containing the recombinant plasmid pBGH1. Norleucine was generated by the leucine biosynthetic pathway from pyruvate or alpha-ketobutyrate in place of alpha-ketoisovalerate as the initial substra…
Cu–Zn hydroxycarbonates have been studied as precursors of Cu–ZnO catalysts, with particular reference to the effect on catalyst activity of ageing the precursor prior to decomposition and reduction. The precursor obtained by precipitation from mixed nitrate solution (Cu/Zn molar ratio 2:1) at 333 K and pH 7.0 consist…
An instrument has been developed to determine the adhesive fracture energy as a function of the most important parameters such as temperature, contact time etc. and to study the stress–strain behaviour during bond separation. Additionally, the deformation processes during debonding were observed by high speed photogra…
"‘Ternary alloys - a comprehensive compendium of evaluated constitutional data and phase diagrams’." British Corrosion Journal, 24(3), pp. 180–181
The introduction of 3d transition metals (M) into the van der Waals gaps between the weakly coupled layers of transition metal dichalcogenides TX2 (T:transition metal, X:chalcogen) produces an interesting family of intercalation compounds, M x TX2, the physical properties of which are different from those of the host…
Fourier transform infrared reflection absorption spectroscopy (FT‐IRAS) and polarization resistance measurements have been used to investigate the surface structure and inhibiting properties of all four monosubstituted methylbenzotriazoles on copper surfaces. The formation of a protective barrier layer is strongly dep…
ANION-EXCHANGE IN LITHIUM ALUMINATE HYDROXIDES
A B ST R A C T : Well-cuttings and core samples from four Gulf Coast areas have been examined by high-resolution scanning-transmission electron microscopy and other techniques to detail the chemical, mineralogical and textural changes during diagenesis. Wells in each of the four areas exhibit a distinct smectite-to-il…
The isotropic-symmetry-breaking bifurcations occurring in a class of liquid-crystal models describing particles with the symmetry of rectangular slabs are studied. The model free-energy functional employed is appropriate to both the mean-field treatment of anisotropic dispersion forces and the Onsager approximation fo…