Materials Literature
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The structure of concanavalin A, a saccharide-binding metalloprotein of subunit molecular weight 25000 Da§, is reported with precision and accuracy equivalent to those of small-molecule crystal structures. An X-ray data-to-parameter ratio of 6.1:1 has allowed the first unrestrained anisotropic refinement of a protein…
A local nonequilibrium approach to rapid solidification of undercooled alloys is presented. Taking into account the finite speed of mass signals, a steady-state solution to the nonisothermal rapid solidification problem has been obtained. We have found that, if the solidification front moves at a velocity V equal to o…
The three-dimensional structure of the 29-residue designed coiled coil having the amino acid sequence acetyl-E VEALEKK VAALESK VQALEKK VEALEHG-amide has been determined and refined to a crystallographic R-factor of 21.4% for all data from 10-A to 2.1-A resolution. This molecule is called coil-VaLd because it contains…
Titanium oxide and platinum have been intercalated into H 2 Ti 4 O 9 and H 4 Nb 6 O 17 by the successive reactions of H 2 Ti 4 O 9 and H 4 Nb 6 O 17 with [Pt(NH 3 ) 4 ]Cl 2 , n-C 3 H 7 NH 2 and acidic TiO 2 colloid solutions followed by UV light irradiation. The thicknesses of titanium oxide and platinum were less tha…
Abstract Members of the genera Rhodococcus and Nocardia corallina were investigated for their capability to accumulate storage lipids that occur in the cytoplasm during cultivation of the cells under nitrogen‐limiting conditions in the absence or presence of various effectors. All bacteria were able to accumulate tria…
To test the approach of combining both ionic and hydrogen-bonding interactions for the design of non-linear optical (NLO) materials, a number of phenol–pyridine co-crystals have been synthesized and their NLO properties investigated. The co-crystals are characterized by second harmonic generation measurements as well…
Fine (}0.1μm) β‐SiC powders, with 3.3 wt% large (}0.44μm) α‐SiC or β‐SiC particles (seeds) added, were hot‐pressed at 1750°C and then annealed at 1850°C to enhance grain growth. Microstructural development during annealing was investigated using image analysis. The introduction of larger seeds into β‐SiC accelerated t…
Transparent zinc oxide (ZnO) films had been chemically deposited on nonconductive glass from aqueous solutions containing zinc nitrate and dimethylamine‐borane (DMAB) kept at 323 K. The ZnO films had a wurtzite structure and exhibited an optical bandgap energy of 3.3 eV which is characteristic of ZnO. A 0.2 μm thick Z…
Foams can be created from coagulation of gas bubbles in liquid. After removal of cell faces, an open-cell foam remains consisting of a strut framework. In the past, mechanical properties were estimated by a small unit cell consisting of only a few struts. However, the random geometry of the foam can be of importance f…
The structure and magnetic properties of novel hybrid molecule-based magnets formed by combination of two magnetically active sublattices, the bimetallic oxalato-bridged honeycomb net [Mn II M III (ox) 3 ] (M II = Mn, Fe, Co, Cr, Ni, Cu; M III = Cr, Fe) and the organometallic cation decamethylferrocenium, are reported.
Henry reaction between nitroalkanes and aldehydes was performed in aqueous media, using NaOH 0.025M as catalyst, in the presence of cetyltrimethylammonium chloride (CTACl)as cationic surfactant.
Al-containing MCM-41 materials are prepared by grafting Al onto purely siliceous MCM-41; the resulting materials retain the hexagonal order and physical properties of the purely siliceous parent MCM-41 and exhibit higher Brønsted acid content compared to Al-MCM-41 prepared by direct hydrothermal synthesis.
Although spider silk has been studied for a number of years the structures of the proteins involved have yet to be definitely determined. X-ray diffraction and solid-state nuclear magnetic resonance (NMR) were used to study major ampullate (dragline) silk from Nephila clavipes. The silk was studied in its natural stat…
Tri- and tetra-dendron poly(amidoamine) (PAMAM) dendrimers were converted into hydrocarbon-soluble polymers and used as hydrophobic nanoscopic scaffolding by reacting their primary amino chain ends with various epoxyalkanes. These hydrophobically modified modules performed well as nanoscopic transport molecules. They…
ABSTRACT Fractional conversion ( f ) takes into account the nonzero texture property upon prolonged heating. This was applied as an alternate technique for reanalyzing texture degradation kinetics based on published data which indicated that the softening of vegetables followed a dual mechanism first order kinetic mod…
Inorganic nanoparticles in organic/inorganic hybrid devices are expected to have properties of interest for electroluminescence applications. The preparation of films of CdSe nanoparticles and poly(phenylenevinylene), PPV, by means of self‐assembly is presented and photoluminescence and electroluminescence studies of…
The synthesis and characterisation of some lead(ii) dithiocarbamato complexes Pb(S 2 CNRR′) 2 is reported. These compounds were used as single molecule precursors to produce nanocrystalline PbS by their thermolysis in trioctylphosphine oxide. The optical and morphological properties of the resulting PbS nanocrystallit…
Abstract This paper is a description of the stopping power routine utilized in the CASINO program that is based on the experimental measurement of the energy loss function (ELF). In addition, we present an ANSI C standard program that can be used to generate the data needed for the stopping power routine. Both optical…
Comb-like polyethylene oxide (PEO) surfaces were prepared on low-density polyethylene (PE). The comb-like PEO chain density was changed gradually along the sample lengths by corona discharge treatment with gradually increasing power and the following graft copolymerization of poly(ethylene glycol) monomethacrylate mac…
The concentration of acid sites in non-dealuminated (Si/Al=10), and dealuminated (Si/Al=20–90) H-beta zeolites has been studied by quantitative IR measurements of pyridine sorption. The number of Brønsted sites was found to be less than that of Al atoms. Most probably this was due to the presence of Al in extraframewo…