Materials Literature
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The ether fraction of the defatted ethanol extract of the aerial parts of Caralluma penicillata (defl) M. E. Br. (Asclepiadaceae) yielded four new oxypregnane glycosides, penicillosides D-G. The structures of the isolated compounds were established by different spectroscopic methods.
The regulator Fur represses with Fe2+ as cofactor iron uptake genes. The fhuF gene reacts very sensitive to minor changes of Fe2+ and Fur. It is assumed that FhuF helps in the mobilisation of iron out of the hydroxamate siderophores transported into the cell. Analysis of the protein revealed an unusual [2Fe-2S] cluste…
Abstract Changing transmission characteristics of food packaging materials by colouring the materials may be a suitable way of reducing photo‐oxidative quality changes. This study proved that packaging in black laminates provided the best protection of Havarti cheese, followed by a white laminate. However, transparent…
A quantum approachA Quantum Approach to Condensed Matter Physics introduces the theory underlying many properties of solids.
A study is reported on the thermal behavior of a (Ce,Zr)Ox/Al2O3 specimen prepared by a microemulsion method and subjected to aging treatments. A similarly prepared classical CeOx/Al2O3 support was used as a reference. Attention is paid to the 1273–1373 K region of treatment, where previous experience demonstrates tha…
The reaction of FeBr2 with three equivalents of NaOtBu in THF affords the first heterometallic FeII alkoxide, [(THF)NaFe(OtBu)3]2 (1), to be structurally characterised. The central core of the structure is an M2O6M′2 fragment with C2 symmetry. The compound is shown to be promising as a new precursor for magnetic iron…
We demonstrate the use of high-angle X-ray scattering to explore protein conformational states in solution by resolving oxidation state- and temperature-dependent changes in the conformation of horse heart cytochrome c. Several detailed models exist for oxidation-dependent changes in mitochondrial class I c cytochrome…
Advanced materials (ceramics, fibers, composites...) exhibit unique high temperature properties but long term durability assessment is mandatory on account of high processing costs. We used Raman micro-spectroscopy to analyze the corrosion resistance of commercially available SiC fibers versus Na+ ions, with or withou…
It is reported that a pretreatment step is required for the fabrication of ordered nanopore arrays on Al by anodization. In this study, one step anodization was carried out on the Al foils with different surface features that resulted from different polishing conditions. The effect of surface morphologies on their ano…
Electrical resistivity, specific heat and electron diffraction experiments at low temperatures unambiguously reveal that the cubic Cd 6 Yb crystal, which is a 1/1 cubic approximant to the recently discovered icosahedral Cd 5.7 Yb, undergoes a reversible order-disorder transition at about 110 K. The transition is most…
The magnetization of the dilute magnetic alloy GaMnP:C prepared by the implantation of Mn into p-GaP:C or by direct molecular-beam epitaxy is reported. The material implanted to produce a Mn level of 3% produces ferromagnetic behavior that persists up to a temperature of 330 K, while the epitaxially derived material s…
A unitary spinor transformation is used to show that the spin-down density of states (DOS) of half-metallic ferromagnets becomes nonzero at finite temperatures. In a strict sense, this thermally activated spin mixing means that half-metallic ferromagnetism is limited to zero temperature. Similar effects are created by…
Abstract The background to the development and production of x‐ray instruments in the former USSR and Russia is due to the work of a number of scientists in educational and research institutions. The development of mass‐produced instruments and their practical introduction throughout the country were made possible by…
The use of an alumina primary coat to eliminate the interaction between aluminium in NiAl single crystal alloy and silica in the ceramic investment casting mould has been examined in this study. The properties of the alumina slurry were characterised and the main factors controlling stability identified. It was found…
Open-pore flexible polyurethane (PUR) foam with varioius pore sizes (1-8 mm) was used as filler to reinforce low-density closed-cell PUR flexible foam. The final composite has a sandwich structure, where the core zone has “foam-in-foam” structure and skin zones are unreinforced PUR foams. Compared to the regular, non-…
Thickeners are used in paint systems to achieve particular rheological properties such as shear-rate dependent behavior, to control the viscosity at low and high shear rates, sag resistance and application viscosity. This contribution addresses the use and application of thickeners in water-borne paints.Examples of su…
Foam bubbles can be a very severe problem in all kinds of coating systems. Mechanisms of foam stabilization and mechanisms of defoamers are briefly reviewed. The chemistry of different defoamer classes (mineral oil defoamers, silicone defoamers, silicone-free polymeric defoamers) together with their typical applicatio…
The pulp and paper industry uses significant amounts of water and energy for the paper production process. Closing the water cycles in this industry, therefore, promises large benefits for the environment and has the potential of huge cost savings for the industry. Closing the water cycle on the other hand also introd…
Semiempirical theory for secondary electron emission is extended to cover the layered structure. Secondary electron emission for the two-layered structure, i.e., a thin film on a substrate, is calculated and compared with the experiment. Good agreement between the two indicates the usefulness of this theory for the la…
Reflectivity spectra of HxMoO3 and LixMoO3 thin films were measured over the photon energy range from 0.4 to 4.2 eV. It was found that microcrystalline molybdenum bronzes have reflectances between 6% and 30% over the concentration x, range 0⩽x⩽0.64. Values for the real part of the refractive index n were also determin…