Materials Literature
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The edema factor exotoxin produced by Bacillus anthracis is an adenylyl cyclase that is activated by calmodulin (CaM) at resting state calcium concentrations in infected cells. A C-terminal 60-kDa fragment corresponding to the catalytic domain of edema factor (EF3) was cloned, overexpressed in Escherichia coli, and pu…
The formation of coils is common in nature when achiral symmetry breaking occurs. Here we describe spectacular examples of single, double and triple coils observed in smectic liquid crystal phases of achiral banana-shaped molecules. Such molecules form chiral smectic phases due to two symmetry-breaking instabilities:…
Raman scattering from individual single-wall carbon nanotube (SWNT) bundles was measured using confocal optical microscopy with 632 nm laser excitation. The Raman scattering from metallic SWNTs was found to depend sensitively on adsorbed oxidizing molecules. Tangential mode Raman lines of HNO 3 -treated SWNTs exhibite…
A new efficient laboratory method of preparation of chlorodimethylsilane (Cl(CH 3 ) 2 SiH) has been elaborated, which is a modification of the Eaborn et al. method (34) and is based on a transsilylation reaction of substituted (amino)dimethylhydrosilanes, R 2 NSiMe 2 H (R 2 = Me 2 , Et 2 , (CH 2 ) n , etc.) with dimet…
Three composites that were 96% alumina were mixed and uniaxially dry‐pressed into bars and pellets; all had monoclinic SrAl 2 Si 2 O 8 as an intergranular phase. The diffraction patterns, microstructure, density, dielectric properties, strength, and toughness were measured. The first composition, which contained cryst…
A series of copolyimides were prepared from two alicyclic dianhydrides having the common molecular formula C10H8O6, rel-[1S,5R,6R]-3-oxabicyclo[3.2.1]octane-2,4-dione-6-spiro-3′-(tetrahydrofuran-2′,5′-dione) (DAn) and c-3-carboxymethyl-r-1,c-2,c-4-cyclopentanetricarboxylic acid 1,4:2,3-dianhydride (TCAAH), with p-phen…
The introduction of a ceramic gas turbine component in commercial power generation service will require significant effort. A careful assessment of the power plant performance benefit achievable from the use of ceramic components is necessary to rationalize the priority of this development compared to other alternativ…
Polyurethane flexible foam materials have a wide range of industrial applications. These applications include flexible foams for packaging, polyurethane-based foam materials for seat cushions in buses, railways, the airline industry, prisons, and domestic bedding. There is a substantial need for the development of fle…
Copper oxide supported on MgO was prepared by the wet impregnation method using basic magnesium carbonate and copper nitrate. Thus, a known weight of basic magnesium carbonate was treated with a known amount of copper nitrate dissolved in the least amount of distilled water necessary to make a paste. The paste was dri…
A high-concentration ozone generator operating at atmospheric pressure was developed to produce ozone for use in fabrication of ultrathin silicon oxide films. A technique for adsorption onto silica gel, in which ozone has adsorption priority over oxygen, was adopted to obtain concentrated ozone. An ozone–oxygen mixtur…
The influence of quasihydrostatic pressure on the electrical transport in epitaxial La0.7Ca0.3MnO3/MgO(100) thin films prepared by pulsed laser deposition (PLD) and metalorganic aerosol deposition (MAD) was studied for temperatures T=4.2–300 K and magnetic fields B=0–12 T. Usual or “intrinsic” pressure effect, charact…
Low density, high modulus, and potentially improved wear resistance are the major benefits of a ferrous composite material. A BS S.156 (4%NiCrMo)gear steel reinforced with 15 vol.-% titanium diboride particles has been demonstrated for possible high performance structural applications. This composite has been produced…
Susceptibility to intergranular attack (IGA) and intergranular stress corrosion cracking (IGSCC) of Alloy 690 (UNS N06690) was investigated using chemical etching, double-loop electrochemical potentiokinetic reactivation (DL-EPR), and slow strain rate tests. Alloy 690 was solution-annealed at 1,100°C for 30 min, water…
Microwave losses due to conductivity and magnetic permeability are investigated in ${\mathrm{La}}_{0.9}{\mathrm{Ca}}_{0.1}{\mathrm{MnO}}_{3}$ films illuminated with photons in the energy range of $E=0.5--2\mathrm{eV}.$ Growth of photoinduced ferromagnetic hysteresis is observed when the magnetic field is swept between…
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Electronic structure calculations predict Ag3AuTe2 to be a small-band-gap semiconductor. Polycrystalline samples of the pure and doped materials have been synthesized, and the physical properties are reported. Thermoelectric power measurements indicate that pure Ag3AuTe2 is a p-type material with a very large room-tem…
A rigorous model of polymerization-induced phase separation (PIPS), based on the non-linear Cahn-Hilliard (C-H) and Flory-Huggins (F-H) theories combined with a second-order polymerization reaction equation, has been formulated and its solutions characterized. The model describes phase separation in system consisting…
Lamprin is a unique structural protein which forms the extracellular matrix of several cartilaginous structures found in the lamprey. Lamprin is noncollagenous in nature but shows sequence similarities to elastins and to insect structural proteins. Here, we characterize the structure and organization of lamprin genes,…
The four compounds in the series from chloro[subphthalocyaninato]boron(III) to chlo-ro[subnaphthalocyaninato]boron(III) were synthesized in a one-pot reaction. To obtain a more soluble set of compounds, the mixture was then reacted with the sodium salt of trihexylsilanol. This mixture was separated by chromatography t…
The deformation mechanism of polystyrene- block -poly(ethylene- alt -propylene) diblock copolymer having soft spherical microdomains composed of poly(ethylene- alt -propylene) block chains in a hard matrix composed of polystyrene block chains under large oscillatory shear deformation with a strain amplitude of 0.41 at…