Materials Literature
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The possible redox (oxidation reduction) chemical methods for precisely determining the oxygen content in the perovskite manganites including hole-doped La1-xCaxMnOy and electron-doped La1-xTexMnOy compounds are described. For manganites annealed at different temperatures, the oxygen content of the samples was determi…
We report on the first direct observation of a transition from a Tomonaga-Luttinger liquid to a Fermi-liquid behavior in potassium-intercalated mats of single-wall carbon nanotubes. Using high resolution photoemission spectroscopy, an analysis of the spectral shape near the Fermi level reveals a Tomonaga-Luttinger liq…
Tetragonal ZrO 2 exhibits good ionic conductivity, high strength, and fracture toughness. But while annealing at relatively low temperatures (63−400 °C), tetragonal ZrO 2 spontaneously transforms to a monoclinic one, and its electrical and mechanical properties degrade severely. The phenomenological observations of th…
We study the defect-induced nonlinear transmission of a periodic structure created by alternating slabs of two materials with positive and negative refractive index. We demonstrate bistable switching and tunable nonlinear transmission in an unconventional band gap that corresponds to the vanishing average refractive i…
Bone marrow-derived endothelial precursor cells incorporate into neovasculature and have been successfully used as vehicles for gene delivery to brain tumors. To determine whether systemically administered Sca1+ bone marrow cells labeled with superparamagnetic iron oxide nanoparticles can be detected by in vivo magnet…
Electric field-driven fiber formation (electrospinning) is developing into a practical means for preparing novel porous filament with unusual structures and affordable mechanical properties. Polycaprolactone (PCL) was dissolved in solvent mixtures of methylene chloride/N,N-dimethyl formamide with ratios of 100/0, 75/2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConducting Metal Dithiolene Complexes: Structural and Electronic PropertiesReizo KatoView Author Information Condensed Molecular Materials Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan Cite this: Chem. Re…
We prepared ZnO nanostructures using chemical and thermal evaporation methods. The properties of the fabricated nanostructures were studied using scanning electron microscopy, x-ray diffraction, photoluminescence, and electron paramagnetic resonance (EPR) spectroscopy. It was found that the luminescence in the visible…
The high catalytic activity of gold clusters on oxides has been attributed to structural effects (including particle thickness and shape and metal oxidation state), as well as to support effects. We have created well-ordered gold mono-layers and bilayers that completely wet (cover) the oxide support, thus eliminating…
the new CCP14 PDRA, replacing Lachlan Cranswick, who left in March 2003 to take up a permanent position at NRC, Chalk River.The CCP14 is continuing in its efforts to provide freely available crystallographic resources and workshops to academics.Presented here is a snapshot of the continually expanding catalogue of
Bacterial DsbC proteins are involved in rearranging or reducing mismatched disulfide bonds folding within the periplasm. The X-ray structure of the enzyme from Haemophilus influenzae has been solved and compared with the known structure of the Escherichia coli protein. The proteins act as V-shaped dimers with a large…
A laser assisted zone melting process has been used to texture large Bi-2212 planar polycrystalline samples with approximate dimensions 100 mm × 10 mm × 1 mm using a high power diode laser. In this technique, the temperature of the support strongly affects the microstructure and the superconducting properties of the t…
For more than forty years, the experimental determination and analysis of electron densities have played a fundamental role in advances in the chemical bond concept. The present paper illustrates the application of this approach to the field of molecular magnetism with examples that recently appeared in the literature…
The nucleation and growth of $\mathrm{Ag}$ nanocrystals, embedded in an initially homogeneous and supersaturated $\mathrm{Ag}$-doped sodium borate glass, were studied by in situ small-angle x-ray scattering (SAXS) during isothermal annealing at different temperatures, from 813 up to 843 K. The SAXS results correspondi…
Abstract Poly( L ‐lactic acid) (PLLA: M w = 19.4 × 10 4 )/poly(ethylene glycol) (PEG: M w = 400) blend films were formed by use of a solvent‐cast technique. The properties and structures of these blend films were investigated. The Young's modulus of the PLLA decreased from 1220 to 417 MPa with the addition of PEG 5 wt…
Accurate low-order Fourier coefficients of the crystal potential of SrTiO(3) are measured by quantitative convergent-beam electron diffraction. The accuracy in the corresponding derived X-ray structure factors is about 0.1% for the strong low-order reflections (sin theta/lambda < 0.3 A(-1)). This accuracy is better th…
Abstract Two new adsorbents [β‐cyclodextrin–chitosan (β‐CD–CTS) and β‐cyclodextrin‐6–chitosan (β‐CD‐6‐CTS)] were synthesized by the reaction of β‐cyclodextrin (β‐CD) with epoxy‐activated chitosan (CTS) and the sulfonation of the C‐6 hydroxyl group of β‐cyclodextrin with CTS, respectively. Their structures were confirm…
APRV (Automatic Processing, Refinement and Visualization) is a new program that enables high-throughput batch processing of crystallographic data. The program combines processing of raw diffraction images, initial structure refinement and visual inspection of resulting electron density into a seamless one-step procedu…
The crystal structure of serine acetyltransferase (SAT) from Haemophilus influenzae Rd determined at 2.7 A resolution is presented. SAT is a member of a family of hexapeptide-containing transferases that contain six-residue tandem repeats (LIV)-G-X(4) that have been shown to form left-handed parallel beta-helices. In…
A topic of current interest is engineering surface mutations in order to improve the success rate of protein crystallization. This report explores the possibility of using metal-ion-mediated crystal-packing interactions to facilitate rational design. Escherichia coli apo acyl carrier protein was chosen as a test case…