Materials Literature
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A gene encoding a 2-deoxy-d-ribose-5-phosphate aldolase (DERA) homolog was identified in the hyperthermophilic Archaea Aeropyrum pernix. The gene was overexpressed in Escherichia coli, and the produced enzyme was purified and characterized. The enzyme is an extremely thermostable DERA; its activity was not lost after…
This paper derives a mathematical model for the hysteresis characteristics of spin-ferromagnetic materials on a quantum-mechanical basis. For a given material, the model provides a link between the micromagnetic behavior at the atomic/domain levels and the details of the scalar hysteresis loop at the macroscopic level…
Abstract Probiotic bacteria, added to yoghurt to impart health benefits, require a low‐oxygen environment for maximum viability. The aim of this experiment was to produce yoghurt with minimal oxygen content using packaging systems. Three packaging systems were evaluated for the effect they exert on the dissolved oxyge…
The second harmonic generation (SHG) hyperpolarizabilities of a family of peripherally substituted push−pull phthalocyanines 1, 2, and 3, having an ethynediyl subunit in the linking bridge between the acceptor and donor moieties, have been measured. Electric field induced second harmonic (EFISH) generation experiments…
Abstract The high-temperature stability of zirconias co-doped with Y and Gd and synthesized as metastable single phases within the equilibrium tetragonal + cubic field is investigated. The motivati...
Ti/Si/2TiC powders were prepared using a mixture method (M) and a mechanical alloying (MA) method to fabricate Ti 3 SiC 2 at 1200°–1400°C using a pulse discharge sintering (PDS) technique. The results showed that the Ti 3 SiC 2 samples with <5 wt% TiC could be rapidly synthesized from the M powders; however, the Ti…
Two Zr−Ce (1:1 molar ratio) mixed oxide specimens, made by the same microemulsion method from different cerium precursor salts (samples ZC1 and ZC2), have been studied by a combination of physicochemical techniques. After calcination at 773 K (high surface area materials HS: S BET = 96 ± 1 m 2 g -1 ) both samples pres…
A new superhard phase of single wall carbon nanotube (SP-SWNT) has been synthesized under non-hydrostatic compression at room temperature. The SP-SWNT was studied in comparison with diamond and ultrahard fullerite both in situ under pressure in a shear diamond anvil cell and after pressure release. After intermediate…
Abstract The goal of primary interest in these investigations was the development of a novel method for preparing elastomeric networks having unusually good ultimate properties. The technique involves end linking mixtures of very short and relatively long functionally‐terminated chains to give bimodal networks. Such (…
Glasses of composition (in equivalent percent) (28 − x )Mg: x Y:56Si:16Al:(100 − y )O: y N, with x = 0, 14, or 28 for y = 0 and 15 and with x = 0, 7, 14, 21, or 28 for y = 10, were prepared by melting and casting. For glasses where the nitrogen content was varied for a constant cationic ratio, the glass molar volume (…
We report the development of new biomacromolecule coatings on biodegradable biomaterials based on electrostatic assembly of extracellular matrix-like molecules. Poly(ethylene imine) (PEI) was employed to engineer poly(dl-lactide) (PDL-LA) substrate to obtain a stable positively charged surface. An extracellular matrix…
An electrospray ionization mass spectrometry based assay was developed for kinetic measurements and inhibitor screening of yeast hexokinase. There is considerable discrepancy in the literature as to the accuracy of kinetic data obtained for hexokinase. In the assay described herein, the product, glucose 6-phosphate wa…
Abstract Electron‐transfer processes in complex chemistry are usually described by Taube’s “outer sphere” and “inner sphere” mechanisms. A behaviour related to these electron‐transfer mechanisms in complex chemistry can be observed for charge‐transfer transport between ligand protected Au 55 nanoclusters. A linear dep…
Abstract The continuous recovery and recycling of soluble metal nanoparticles by means of ultrafiltration is described, employing hybrids of palladium nanoparticles with highly branched amphiphilic polyglycerol as a catalyst for cyclohexene hydrogenation as a model reaction. In a continuously operated membrane reactor…
To study the effects of plasma chemistries on etch characteristics and plasma-induced damage to the optical properties, dry etching of ZnO films has been carried out using inductively coupled plasmas of Cl2/Ar, Cl2/H2/Ar, and CH4/H2/Ar. The CH4/H2/Ar chemistry showed a faster etch rate and a better surface morphology…
Abstract Mono‐ and bi‐functional guest molecules, poly(ethylene glycol)‐ n ‐alkyl‐3‐sulfopropyl diether (PEG‐AS) and poly(ethylene glycol)dicarboxylic acid (PEG‐DC), containing hydrophilic polyoxyethylene (PEO) chains of different ethylene oxide units (EOUs) are incorporated between the layers of Cu 2 Cr(OH) 6 Cl· n H…
We study ion-irradiation-induced electrical isolation in n-type single-crystal ZnO epilayers. Emphasis is given to improving the thermal stability of isolation and obtaining a better understanding of the isolation mechanism. Results show that an increase in the dose of 2 MeV O16 ions (up to ∼2 orders of magnitude abov…
The innovative electrochemical monitoring probe (BIOX) recently developed to improve the antifouling treatments of cooling systems in industrial plants is presented. On the basis of the good results obtained from applications on marine sites, some research has been stated to validate this technique in biofilm growth a…
Abstract To obtain transparent, scratch‐ and abrasion‐resistant coating materials a high content of nanosized silica and alumina filler was embedded in radiation‐curable acrylate formulations by acid catalyzed silylation using trialkoxysilanes. 29 Si magic angle spinning (MAS) NMR spectroscopy and matrix‐assisted lase…
Abstract Stress-induced crystallization is studied in an extensional flow device (a cross-slot flow cell) for an isotactic Polypropylene (iPP) by measuring the micro-structure that develops after flow. Birefringence and Wide Angle X-ray experiments were performed. The birefringence experiments with flow below the melt…