Materials Literature
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Under stress, many crystalline materials exhibit irreversible plastic deformation caused by the motion of lattice dislocations. In plastically deformed microcrystals, internal dislocation avalanches lead to jumps in the stress-strain curves (strain bursts), whereas in macroscopic samples plasticity appears as a smooth…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The peptide-derived glyoxal inhibitor Z-Ala-Pro-Phe-glyoxal, where Z is benzyloxycarbonyl, is an extremely potent inhibitor of chymotrypsin. When it is bound to chymotrypsin both the glyoxal (RCOCHO) keto and aldehyde carbons are sp3 hybridized with chemical shifts of 100.7 and 91.4 ppm, respectively. However it is ha…
The tryptophan synthase alpha2beta2 complex catalyzes the last two steps in the biosynthesis of l-tryptophan in bacteria, plants, and fungi, the conversion of indole-3-glycerol phosphate and l-serine to l-tryptophan, glyceraldehyde 3-phosphate, and water. The beta-subunit binds pyridoxal 5'-phosphate and catalyzes the…
Cr 3+ singly doped and Eu 2+ , Cr 3+ co-doped SrAl 12 O 19 nano-rods with different diameters have been prepared by a combustion method. A new emission band of Cr 3+ centered at 704 nm on the low energy side of the R-line at 688 nm originating from the 2 E– 4 A 2 transition of Cr 3+ is observed. This band enhances wit…
Abstract A theory of general solutions of plane problems is developed for the coupled equations of plane elasticity of one‐dimensional quasicrystals. By introducing a displacement function, very large numbers of complicated equations of the in‐plane problem are simplified to a sixth‐order partial differential governin…
Abstract In this paper we demonstrate how secondary ion mass spectrometry (SIMS) can be applied to ZnO nanowire structures for gold catalyst residue determination. Gold plays a significant role in determining the structural properties of such nanowires, with the location of the gold after growth being a strong indicat…
The structure of the layered noncentrosymmetric titanosilicate AM-1 (also known as JDF-L1, disodium titanium tetrasilicate dihydrate), Na 4 Ti 2 Si 8 O 22 ·4H 2 O, grown as small single crystals without the use of organics, has been refined from single-crystal X-ray diffraction data. The H atom has been located for th…
BACKGROUND: Electrospinning is a non-mechanical processing strategy that can be used to process a variety of native and synthetic polymers into highly porous materials composed of nano-scale to micron-scale diameter fibers. By nature, electrospun materials exhibit an extensive surface area and highly interconnected po…
We present here a study of the magnetic properties of the ${\mathrm{Nd}}_{2\ensuremath{-}x}{\mathrm{Ho}}_{x}{\mathrm{Fe}}_{14}\mathrm{B}$ series. The macroscopic properties of these compounds evolve continuously from those of ${\mathrm{Nd}}_{2}{\mathrm{Fe}}_{14}\mathrm{B}$ to those of ${\mathrm{Ho}}_{2}{\mathrm{Fe}}_{…
Plasmon resonant structures with unique topographic characteristics and tunable optical properties for surface-enhanced Raman scattering, Zin, Melvin T, Leong, Kirsty, Wong, Ngo-Yin, Ma, Hong, Jen, Alex K-Y
A two-step catalyst annealing process is developed in order to control the diameter of nickel catalyst particles for the growth of carbon nanotubes (CNTs) by microwave plasma-enhanced chemical vapour deposition (MW PECVD). Thermal annealing of a continuous nickel film in a hydrogen (H 2 ) environment in a first step i…
AIMS: The aim of the present study was to describe an aerobic, mesophilic and heterotrophic bacterium, designated RA26, able to produce a medium-chain-length polyhydroxyalkanoate (PHA). It was isolated from a French Polynesian bacterial mat located in the atoll of Rangiroa. METHODS AND RESULTS: This micro-organism, on…
The critical magnetic fields required to induce the magnetostructural transformation below $\ensuremath{\sim}30\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in ${\mathrm{Gd}}_{5}{\mathrm{Ge}}_{4}$ are dependent on the size of the magnetic-field step employed during isothermal measurements of magnetization: the smaller the st…
First-principle density functional calculations of [0001] ZnO nanowires demonstrate that exposure of the mixed-terminated side surfaces to atomic hydrogen can result in drastic changes of electronic properties. When the dangling bonds of the side surfaces are completely saturated by H atoms, the nanowires are insulati…
The final oxidation state of iron particles, used as catalysts for the growth by chemical vapor deposition of carbon nanotubes, was investigated by means of in situ photoelectron spectroscopy. Although the chemical evolution of the catalyst during the process is known to depend strongly on the nature of the substrate,…
Bimetallic ytterbocene complexes with bridging N-heterocylic ligands have been studied extensively in recent years due to their potential applications ranging from molecular wires to single-molecule magnets. Herein, we review our recent results for a series of ytterbocene polypyridyl bimetallic complexes to highlight…
Abstract An ethylene–propylene copolymer synthesized with a Ziegler–Natta catalyst was fractionated by a combination of dissolution/precipitation and temperature‐gradient extraction fractionation. The fractions were characterized with 13 C‐NMR, differential scanning calorimetry, and wide‐angle X‐ray diffraction. The f…
The interaction of bare graphene nanoribbons (GNRs) was investigated by ab initio density functional theory calculations with both the local density approximation (LDA) and the generalized gradient approximation (GGA). Remarkably, two bare 8-GNRs with zigzag-shaped edges are predicted to form an (8, 8) armchair single…
Large-scale debundling of single-walled nanotubes has been demonstrated by dilution of nanotube dispersions in the solvent γ-butyrolactone. This liquid, sometimes referred to as 'liquid ecstasy', is well known for its narcotic properties. At high concentrations the dispersions form an anisotropic, liquid crystalline p…