Materials Literature
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We have prepared and fully characterized by means of multinuclear NMR and UV-vis spectroscopy a series of pyridoneimines and pyridonemethides in order to show how it is possible to finely tune pi-electron structure properties by properly exploiting substituent and solvent effects. Substituents with different electron-…
Nanocrystalline zirconia with a grain size of ∼5 nm was surface‐doped with 3 and 30 mol% alumina by chemical vapor synthesis using two sequential hot‐wall reactors. The powders were characterized by high‐resolution transmission electron microscopy, X‐ray diffractometry (XRD), and nitrogen adsorption. Aqueous dispersio…
Nucleating agents are used in semi-crystalline polymer systems (mainly polyolefins) to increase the rate of crystallization. These agents increase degree of crystallinity and lamellae thickness and, hence, improve stiffness and strength. In addition to altered mechanical characteristics, clarifying agents do also impr…
Ion implantation and its related processes are powerful techniques for modifying the surface composition and, accordingly, the surface properties of metals. Research on the effect of ion implantation on the corrosion behavior of metals has now been carried out for over thirty years. This paper reviews research done be…
Abstract The thermodynamics and kinetics of CO 2 speciation in silicate melts have been studied by measuring the concentration of CO 2 mol and carbonate in jadeite glass annealed at 575, 450 and 400°C. Assuming that the reaction is 1 where CO 2 mol ..O br represents a CO 2 molecule weakly bonded to a bridging oxygen i…
Incorporation of the photoisomerizable amino acid phenylazophenylalanine (PAP) into enzyme structures has been proposed as a strategy for photoswitching enzyme activity. To evaluate the strengths and limitations of this approach to enzyme photo-control, we performed a kinetic analysis of RNase S analogues containing P…
Oligo(1,4-phenyleneethynylene)s 1a−e, with solubilizing propoxy side chains, were prepared by use of Hagihara−Sonogashira coupling reactions. The synthetic strategy was based on a building block system and on the use of trimethylsilyl and triisopropylsilyl protecting groups that could be cleaved selectively. The exten…
Porous alumina filters were coated by vacuum deposition with silver metal and used as substrates for surface-enhanced Raman scattering (SERS). These were studied by UV-Vis absorption spectroscopy and scanning electron microscopy. The substrates exhibit reproducible Raman enhancement for different molecules tested in t…
An amine-functionalized polymer has been used to simultaneously assemble carboxylic acid functionalized gold and silica nanoparticles into extended aggregates. This three component assembly process is highly versatile, with aggregate morphology controlled through stoichiometry, and nanoparticle segregation within the…
Cell growth inhibition by several d-amino acids can be explained by an in vivo production of d-aminoacyl-tRNA molecules. Escherichia coli and yeast cells express an enzyme, d-Tyr-tRNA(Tyr) deacylase, capable of recycling such d-aminoacyl-tRNA molecules into free tRNA and d-amino acid. Accordingly, upon inactivation of…
The relation between the polycrystal deformation and single crystal deformation has been studied for pure polycrystalline copper deformed in tension. The dislocation microstructure has been analyzed for grains of different orientation by transmission electron microscopy (TEM) and three types of microstructures have be…
A multistep synthesis of the electron-rich 3,4-ethylenedioxyselenophene (EDOS) monomer is described. The electrochemical properties as well as the electropolymerization of EDOS are presented. [structure: see text]
A new synthesis pathway for MCM-48 is developed using fumed silica as the silicate source and a Gemini surfactant (GEM 16-12-16) as the surface directing agent. Different synthesis parameters have been optimized in order to obtain a highly ordered mesostructure. The determining factor in the stabilization of the final…
Er 3+ and Yb3+ ions codoped calcium aluminum germanate glass has been synthesized by solid-state reaction. An intense infrared emission at 1534 nm, which corresponds to the minimum losses of silica based fibers used in optical communications, and visible emissions at 416, 490, 525, 548, and 660 nm, corresponding to th…
As an evaluation test method for surface insulation degradation of organic insulating materials, the tracking test method is described in IEC Publ.112 as a safe and reliable evaluation. This publication has now been applied to the material selection. Due to the fact that the experimental values of the comparative trac…
MtaN (Multidrug Transporter Activation, N terminus) is a constitutive, transcriptionally active 109-residue truncation mutant, which contains only the N-terminal DNA-binding and dimerization domains of MerR family member Mta. The 2.75 A resolution crystal structure of apo-MtaN reveals a winged helix-turn-helix protein…
Nanopores in alumina membranes can serve as reaction vessels for the generation of nanosized gold particles. In addition, they enable a quasi one-dimensional arrangement of nanoparticles, the optical properties of which can easily be investigated due to their transparency in the visible and near ultraviolet (UV) regio…
We have developed a three-dimensional Monte Carlo simulator for thin film growth and applied it to understand the morphologies of thin films prepared by dynamic oblique deposition with a special emphasis on an effective surface area. Columnar shapes zigzag, helix, and cylinder are successfully reproduced, and the pack…
Abstract New types of phase transitions occurring in molecule-based materials have recently drawn great attention, in which electrons are directly involved. In this paper are given calorimetric investigations aimed at the elucidation of the mechanisms governing such phase transitions as (i) spin crossover phenomena oc…
The 20 MHz water relaxivity (r(1)) of gadolinium(III) complexes formed with two fatty acid analogues of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis(methylene phosphonate) were shown to increase substantially in the presence of albumin. The r(1) values of Gd(C(8)-DOTP)(5-) and Gd(C(11)-DOTP)(5-) in water were simi…