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。
The novel network polymers 2a-2d based on calix[4]resorcinarene derivatives were obtained with yields 2a:80%, 2b:90%, 2c:70%, 2d:70%. Polymers 2a and 2b containing fragments of tetramethylcalix[4]resorcinarene or tetraphenylcalix[4]resorcinarene as a repeating units were synthesized by condensation cis-tetramethylcali…
This study describes the biosynthesis of novel sulfur-containing polyhydroxyalkanoates (PHAs), which consist exclusively of hydroxypropylthioalkanoic acid containing thioether groups in the side chains. In addition, the utilization of alkylthioalkanoic acids (=thia fatty acids) by various bacteria was investigated. Ba…
The effect of seeding on the microstructure and mechanical properties of single‐phase Y‐α‐SiAlON ceramics with elongated grains has been studied. Seeds of the intended α‐SiAlON compositions but with different size, shape, and number of grains have been compared for their effects. The microstructure, resistance (R‐curv…
The magnetization of p-GaN or p-AlGaN/GaN superlattices was measured after implantation with high doses (3–5×1016 cm−2) of Mn, Fe, or Ni and subsequent annealing at 700–1000 °C. The samples showed ferromagnetic contributions below temperatures ranging from 190–250 K for Mn to 45–185 K for Ni and 80–250 K for Fe. The u…
We report on further experimental studies of the ac field response of transient and permanent gratings written with visible light in both planar and homeotropic, dye-doped liquid crystal cells. It is found that the diffraction efficiency of these gratings can be controlled by the applied ac field. High ac frequencies…
Through layer-by-layer assembly, a series of undecatungstozincates monosubstituted by first-row transition metals, ZnW11M(H2O)O (M=Cr, Mn, Fe, Co, Ni, Cu or Zn) were first successfully immobilized on a 4-aminobenzoic acid modified glassy carbon electrode surface. The electrochemical behaviors of these polyoxometalates…
Nanoparticles were synthesized using a modified aerosol decomposition process. The goal of this work was to investigate the breakup of micrometer/submicrometer particles into nanosized particles in salt microreactors using NiO synthesis as a model. The influence of various operating conditions such as temperature, typ…
Shear behavior is one of the most important characteristics that contribute to the performance and appearance of woven fabrics. In this paper, a model derived from Kilby's work is first used to predict fabric shear rigidity in different directions. Based on the existing literature, a strong linear relationship is foun…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTIn-Plane Photoalignment of Liquid Crystals by Azobenzene−Polyelectrolyte Layer-by-Layer Ultrathin FilmsMi-Kyoung Park and Rigoberto C. AdvinculaView Author Information Department of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294-1240 Cite this: Langmu…
Flavodoxin is an alpha/beta protein with a noncovalently bound flavin-mononucleotide (FMN) cofactor. The apo-protein adopts a structure identical to that of the holo-form, although there is more dynamics in the FMN-binding loops. The equilibrium unfolding processes of Azotobacter vinelandii apo-flavodoxin, and Desulfo…
[reaction: see text] The crystal and molecular structures of two six-coordinate tin(IV)porphyrin phenolate complexes show that infinite cylindrical channels of uniform pore dimension are formed along the crystallographic c-direction. The underlying recognition event responsible for the porosity is an extremely tight i…
Inorganic silica nanoparticles were encapsulated with an epoxy resin to give waterborne nanocomposite dispersions, using the phase-inversion emulsification technique. Sub-micron-sized waterborne particles with narrow size distribution were prepared such. Microscopy results indicate that all the silica nanoparticles ar…
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…