Materials Literature
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This work studies the ternary Si-C-N phases ${\mathrm{SiC}}_{2}{\mathrm{N}}_{4}$ and ${\mathrm{Si}}_{2}{\mathrm{CN}}_{4},$exploiting an analogy between the NCN and O groups. Starting from the molecular model of ${N,N}^{\ensuremath{'}}\ensuremath{-}\mathrm{bis}(\mathrm{trimethylsilyl})\ensuremath{-}\mathrm{carbodiimide…
Poly(3-hydroxyalkanoate)-g-poly(ethylene glycol) crosslinked graft copolymers are described. Poly(3-hydroxyalkanoate)s containing double bonds in the side chain (PHA-DB) were obtained by co-feeding Pseudomonas oleovorans with a mixture of nonanoic acid and anchovy (hamci) oily acid (in weight ratios of 50/50 and 70/30…
Serendipity has been a major player in most dye discoveries, and phthalocyanines are no exception. The true account of their discovery in 1928 is given using information provided by one of the individuals involved (Ron Greig). One of the inventors, Drescher, after making a key observation as to the nature of the insol…
It has been shown before by (31)P NMR that Ras bound to the nonhydrolyzable GTP analogue guanosine 5'-O-(beta, gamma-imidotriphosphate) (GppNHp) exists in two conformations which are rapidly interconverting with a rate constant of 3200 s-1 at 30 degrees C [Geyer, M., et al. (1996) Biochemistry 35, 10308-10320]. Here w…
Abstract Mechanisms by which organic bases are adsorbed on hydrated smectite surfaces were investigated. Three Ca-saturated reference smectites (Otay, SPV, and Panther Creek) were dispersed in distilled water containing 5 μmol of pyridine or 3-butylpyridine. The pH was adjusted to between 7.5 and 3 using 0.01 M HCl. A…
Infrared spectroscopy is used to investigate the electronic structure and charge carrier relaxation in crystalline films of ${\mathrm{CrO}}_{2}$ which is the simplest of all half-metallic ferromagnets. Chromium dioxide is a bad metal at room temperature but it has a remarkably low residual resistivity $(<5 \ensurem…
Abstract Some A 2 + B 3 and A 3 + B 3 reagent pairs have been used for the direct polyamidation reaction leading, besides the network formation, to hyperbranched aramid structures. Depending on the chosen experimental conditions, variable amounts of a sol fraction having close similarities with the hyperbranched arami…
As type IX collagen is a minor cartilage component, it is difficult to purify sufficient amounts of it from tissues or cultured cells to study its structure and function. Also, the conventional pepsin digestion used for fibrillar collagens cannot be utilized for purifying type IX collagen, because it contains several…
Fumed silica is a synthetic amorphous silicon dioxide produced by burning silicon tetrachloride in an oxygen-hydrogen flame. Surface areas range from 50 up to 400 m2/g. Using particle sizing techniques, fumed silica shows micro-sized particles leading to surface areas markedly lower than expected. Fumed silica appears…
Four kinds of polyetherimides with different diamines were prepared and used to improve the toughness of bismaleimide resins composed of bis(4-maleimidediphenyl)methane and o,o′-diallyl bisphenol A. Dynamic mechanical analysis and scanning electron microscopy were used to characterize the phase structure of the modifi…
To elucidate the process and mechanism of the prograde conversion of saponite to chlorite through corrensite, the microstructures of a series of chlorite-smectite (C-S) mixed-layer samples from Kamikita, northern Japan were examined by high-resolution transmission electron microscopy using both lattice and structure i…
Optical spectroscopy and theory demonstrate that photon excitation of the positively charged anion vacancies ${(F}^{+}$ centers) at 5.0 eV in neutron-irradiated MgO crystals releases holes that are subsequently trapped at V-type centers, which are cation vacancies charge compensated by impurities, such as ${\mathrm{Al…
Instead of the conventional sol‐gel process in which heat treatment is used to form a dense composite film after dipping/withdrawing a substrate into/from the sol, a new sol‐gel process incorporating ultraviolet (UV) irradiation at ambient temperature has been attempted to improve the alkaline corrosion resistance of…
In order to scale up medium-chain-length polyhydroxyalkanoate (mcl-PHA) production in recombinant microorganisms, we generated and investigated different recombinant bacteria containing a stable regulated expression system for phaC1, which encodes one of the mcl-PHA polymerases of Pseudomonas oleovorans. We used the m…
Lanthanum zirconate (La 2 Zr 2 O 7 ) was prepared by coprecipitating lanthanum nitrate and zirconyl oxychloride at pH 10, followed by ethanol washing. The initial high surface area of ∼304 m 2 ·g −1 decreased very rapidly with increased sintering temperature and decreased to an immeasurably small value after heating a…
Premature fracture and splitting of human head hair is cosmetically undesirable and at worse, unsightly. It is often regarded both by the hair's owner and by others as indicative of hair in poor condition and attracts considerable expenditure on hair toiletry products in sometimes vague attempts to prevent or repair t…
The glow curve structure of LiF:Mg,Ti (TLD-100) has been investigated following irradiation by low energy alpha particles and 4He ions following both air and N2 annealing. Tm-Tstop analysis was carried out following 60Co gamma volumetric, low ionisation density, irradiation (annealing in air) as well as low energy alp…
In this paper we present new observations of a laser generated cavitation bubble interacting with an inertial boundary. Employing schlieren photography and Mach–Zehnder interferometry techniques, we present photographic sequences of a cavity interacting with a flexible membrane. During expansion the membrane is deform…
Abstract The growth kinetics of calcite crystals are studied in a batch‐fluidized‐bed crystallizer, which is maintained at a constant pH. The growth experiments are conducted in the metastable region explored as part of this research. The crystal growth rates are evaluated from the consumption rates of calcium ions, u…
Biofilms are edible films formed from biopolymers. In the casting process technique, the biofilm is obtained by the drying of a colloidal solution in the final process stage The aim of this work was to analyse the drying process of gelatin based biofilms, in room frontier conditions. The biofilms were prepared initial…