Materials Literature
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Thermogravimetric analysis was carried out to investigate the thermal decomposition behavior of a commercial fire retarded (FR) and a non-fire retarded (NFR) flexible polyurethane foam. The effects of the heating rate and the reaction atmosphere on the thermal decomposition process were studied at three different heat…
The x-ray crystallographic structure of selenomethionyl cytosine-5'-monophosphate-acylneuraminate synthetase (CMP-NeuAc synthetase) from Neisseria meningitidis has been determined at 2.0-A resolution using multiple-wavelength anomalous dispersion phasing, and a second structure, in the presence of the substrate analog…
The comonomer composition and its distribution have been investigated for poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HH)], which was bacterially synthesized by Ralstonia eutropha from coconut oil as a carbon source. Using a chloroform/heptane mixed solvent, they were fractionated into several fractions w…
The clinical usefulness of antitumor chemotherapy has been strongly limited by the lack of specificity of most anticancer drugs, which act also against healthy cells. The aim of this work was to design, synthesize, and evaluate a macromolecular prodrug of Cytarabine, a known antitumor drug, which is a specific substra…
The effects of lead content on the structure and electrical properties of Pb((Zn 1/3 Nb 2/3 ) 0.5 (Zr 0.47 Ti 0.53 ) 0.5 )O 3 ceramics were investigated. Specimens with various lead concentrations were prepared by the conventional oxide‐mixing method. When the lead concentration was slightly less than the stoichiometr…
Abstract The sol—gel reaction of tetraethoxysilane produced the fine and well-dispersed in situ silica particles in the “green” natural rubber (NR) matrix before curing. This new method was developed for a NR/silica composite material, and a good reinforcement effect of in situ silica was observed on the NR vulcanizat…
A series of novel human-made functional fibers (biofibers) based on chitin and chitosan are prepared by the wet-spinning and the post chemical modification of chitosan fiber. The wet-spinning gives rise to a series of biofibers: chitin, chitosan, chitin-cellulose, chitosan-cellulose, chitin-silk fibroin, chitin-glycos…
Production of chitosan was conducted using two Mucoralean strains, Mucor racemosus and Cunninghamella elegans. Chitosan was extracted from mycelia of M. racemosus and C. elegans at different growth phases on YPD medium. In both fungi, chitosan was rapidly produced, while highest yield of extractable chitosan was found…
Gear hobbing is an efficient method to manufacture high quality and performance toothed wheels, although it is associated with complicated process kinematics, chip formation and tool wear mechanisms. The variant cutting contribution of each hob tooth to the gear gaps formation might lead to an uneven wear distribution…
The dry etching mechanism of lead zirconate titanate (PZT) films was studied in high density CF 4 and Cl 2 /CF 4 inductively coupled plasmas. The concentrations of atomic Cl and F as well as the flux and energy of bombarding ions were monitored as a function of etching parameters such as etching gas ratio, substrate b…
The influence of external charges on the radiative recombination rate of an electron−hole pair in a CdSe quantum dot is investigated via atomistic empirical pseudopotential calculations. It is found that, when a negative external charge is near the surface of a CdSe quantum dot, its Coulomb potential could be strong e…
The isolation and structural characterization of [(terpy)Mn(III)(N3)3], complex 1, is reported (terpy = 2,2':6',2' '-terpyridine). Complex 1, a product of the reaction between the mixed-valence dimer [(terpy)(H2O)Mn(III)(O)2Mn(IV)(OH2)(terpy)](NO3)3 and NaN3, crystallizes in a triclinic system, space group P1, a = 8.4…
Several triterpenes isolated from Leptadenia hastata latex were tested for their anti-inflammatory activity. Lupeol (1), its acetate (2) and palmitate (3) esters were found to be the main antiinflammatory constituents in the croton oil-induced ear oedema test. Furthermore, lupeol hemisuccinate (4), synthesized from lu…
Control of the orientation of thin Pd films on (100) SrTiO3 surfaces was obtained by changing the growth temperature. In particular, a three-step growth method was applied to deposit thin single-crystal Pd films on single-crystal (100) SrTiO3 surfaces. This was realized by first growing epitaxial Pd seeds at elevated…
Density functional theory (DFT) calculations have been carried out for a variety of iron and manganese porphyrin complexes with metal oxidation states of +3 and above. In general, DFT gives very good descriptions of molecular structure and electron distributions, but appears less reliable in predictions of the relativ…
Nanochannel arrays with an ideally ordered hole configuration with a 63 nm hole periodicity and 15–40 nm hole diameter were fabricated using anodization of the pretextured Al in sulfuric acid solution. The SiC mold with an array of convexes, which was prepared by electron beam lithography, was used for the nanoindenta…
Polyethylene is widely used as an insulating material (especially as cable insulation); therefore, of interest are ionization aging processes that cause its breakdown. For cable diagnostics, the partial discharge (PD) technique is used. In particular, PD characteristics may help in identifying the type of a defect [1]…
Different parameters affect the electrical resistivity of green specimens. This paper presents the effect of the particle size distribution, the compacting pressure, and the oxidation of the powder on the electrical resistivity of green specimens fabricated with different powders (Fe, Zn, Ni, and Cu). The results show…
3,6-Dibromocarbazole was identified to be triboluminescent for the first time. From the triboluminescence and photoluminescence spectra, it was found that the room-temperature triboluminescence spectrum of 3,6-dibromocarbazole, unlike most other triboluminescent materials, was different from its photoluminescence spec…
Temperature variation of the optical absorption edge of Sn2P2S6 ferroelectric with three-dimensional crystalline structure and SnP2S6 layered crystals with 2D structure is studied. In both cases the Urbach shape of the absorption edge is revealed, its temperature behaviour in Sn2P2S6 crystal being determined by the pr…