Materials Literature
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Spectroscopic techniques are used to investigate energy transfer and radiation-induced reactions on the surfaces of particulate silicas. Upon subjection to high energy radiation, hydrogen atoms are produced with significant yields in all silica samples pretreated at 150 °C, for an example, G (H) = 4.2 in silica gel Da…
The present necessity to use heat-resistant materials in electronics justified the scientific interest in different heterocyclic polymers. This paper is especially concerned with the preparation of novel heat-resistant materials having benzimidazole moieties in the main chain. The poly(ether benzimidazole)s were prepa…
UDP-galactose 4-epimerase plays a critical role in sugar metabolism by catalyzing the interconversion of UDP-galactose and UDP-glucose. Originally, it was assumed that the enzyme contained a "traditional" catalytic base that served to abstract a proton from the 4'-hydroxyl group of the UDP-glucose or UDP-galactose sub…
We have studied stable structures of hydrogenated Si clusters grown from silane gas in an ion trap developed for cluster growth. The grown clusters were extracted from the ion trap through two different pathways and were analyzed by mass spectrometers. The Si6Hx+ cations were stably grown, among them clusters with x=1…
Oligomerization of a mixture of monomeric iron(III) 2-hydroxy-5,10,15,20-tetraphenylporphyrin, (2-OH-TPP)Fe(III)Cl, manganese(III) 2-hydroxy-5,10,15,20-tetraphenylporphyrin, (2-OH-TPP)Mn(III)Cl, and gallium(III) 2-hydroxy-5,10,15,20-tetraphenylporphyrin, (2-OH-TPP)Ga(III)Cl, complexes affords the series of heterometal…
A lead zirconate titanate ( Pb(Zr, Ti)O 3 , PZT) thick film was produced using the Jet Molding System which was developed from a gas deposition method. Some of the characteristics of the deposited lead zirconate titanate were determined by X-ray diffraction, scanning electron microscopy and atomic force microscopy. Th…
A series of μ-tto- (tto = C 2 S 4 2 - = tetrathiooxalato) bridged bimetallic Ni(II) complexes with the general formula (Y) 2 {tto[Ni(L)] 2 } (where Y = Bu 4 N +, L = dsit = C 3 Se 2 S 3 2 - = 2-thioxo-1,3-dithiole-4,5-diselenolato ( 2 ) and dmise = C 3 SeS 4 2 - = 2-selenoxo-1,3-dithiole-4,5-dithiolato ( 3 ); and wher…
We report a chemical, thermogravimetric, and electron-diffraction/microscopy study of a tin-monoxide phase. A large deviation from the ideal stoichiometry is observed due to metal vacancies, resulting in the formula ${\mathrm{Sn}}_{1\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}\mathrm{O}.$ This nonstoichiometry…
As proton concentration increases, the first two reversible (1 e - )-reduction processes of the anion α-[S 2 Mo 18 O 62 ] 4 - in 95/5 MeCN/H 2 O convert to an overall (2 e - )-reduction process. Half-wave potentials for reversible one-electron reduction of [S 2 Mo 18 O 62 ] 4 - itself and its two one-electron-reduced…
Many fabric mechanics researchers have reported that specimens being tested on the KES shear tester are not subjected to pure shear deformation; therefore, test results cannot lead directly to a determination of the fabric shear modulus and stress/strain relationship, particularly in the nonlinear range of stress-stra…
We have studied the fire behavior and the heat transfer in the in tumescent formulations polypropylene (PP)-ammonium polyphosphate (APP)/pentaerythritol (PER) and PP-Hostaflam AP750 (AP750). We have shown that the fire proofing properties (LOI, UL-94 and cone calorimeter) of PP was strongly improved using the commerci…
The voltammetric response of an electrode covered with an electroactive self-assembled monolayer is modeled including discreteness of charge effects and interfacial ion association. Discreteness of charge potentials are estimated according to the hexagonal array model of Macdonald and Barlow, and results are compared…
The measured macroscopic growth rates of the (110) face of tetragonal lysozyme show an unexpectedly complex dependence on the supersaturation. In earlier studies it has been shown that an aggregate growth unit could account for experimental growth-rate trends. In particular molecular packing and interactions in the gr…
Protein p6 from Bacillus subtilis phage phi29 (Mr = 11 800) binds in vitro to DNA forming a large nucleoprotein complex in which the DNA wraps a multimeric protein core. The high intracellular abundance of protein p6 together with its ability to bind the whole phi29 DNA in vitro strongly suggests that it plays a role…
Niobium oxide films are promising cathodic electrochromic materials that in certain aspects can compete with the more frequently studied films. The films reported here were prepared using the sol‐gel route from a precursor. The electrochromic properties were pronounced for crystalline films heat‐treated at 500°C exhib…
A domain model consistent with the measured capacitance–voltage (CV) characteristics of lead zirconate titanate (PZT) capacitors is proposed. Two variants of this model are presented and compared with experimentally measured CV data. The basic model is developed adopting a macroscopic electric field that is spatially…
GTD-43, a polypeptide with 43 amino acid residues, has been designed to fold into a hairpin helix-loop-helix motif that can dimerize to form a four-helix bundle. The mean residue ellipticity is −21000 deg cm 2 dmol - 1, and the magnitude is independent of pH in the interval of 2.4−4.6. The chemical shift dispersion of…
Cerium-doped TiO 2 thin films have been prepared by reactive RF sputtering. At low Ce concentration, X-ray diffraction indicates that the films have the anatase structure. Ce concentrations higher than 1.2 at.% result in an amorphization of the film which remains stable up to 873 K. The TiO 2 electrical properties hav…
A kinetic model is presented, which describes the platinum-catalyzed selective oxidation of methyl α- d -glucopyranoside to sodium methyl α- d -glucuronate with molecular oxygen in the presence of deactivation by overoxidation. Overoxidation is completely reversible and most adequately described by a reversible transf…
Inosine-5'-monophosphate dehydrogenase (IMPDH) is an attractive drug target for the control of parasitic infections. The enzyme catalyzes the oxidation of inosine monophosphate (IMP) to xanthosine monophosphate (XMP), the committed step in de novo guanosine monophosphate (GMP) biosynthesis. We have determined the crys…