Materials Literature
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Amorphous phases have been prepared by melt spinning technique from the oxide samples having compositions 41.3 mol%SrO-41.3 mol%Fe2O3-17.4 mol%B2O3 (composition S) and 63.1 mol%SrO-19.4 mol%Fe2O3-17.5 mol%B2O3 (composition T). When these amorphous phases are heat-treated by heat treatment, SrO·6Fe2O3 crystal particles…
Isocitrate dehydrogenase (IDH) of Escherichia coli is regulated by phosphorylation and dephosphorylation. This phosphorylation cycle controls the flow of isocitrate through the glyoxylate bypass, a pathway which bypasses the CO2 evolving steps of the Krebs' cycle. IDH is phosphorylated at a single serine which resides…
The expression and purification of the rabbit muscle aldolase A (D-fructose 1,6-bisphosphate:D-glyceraldehyde-3-phosphate lyase, EC 4.1.2.13) from an expression plasmid in bacteria is described. The enzyme is produced in bacteria at a level of 300 mg/liter and is indistinguishable from the enzyme isolated from muscle…
The AC electromigration of multilayered interconnect systems consisting of TiW-AlSiCu and CVD W-AlSiCu is studied under stress of repetitive dual-pulse current waveforms at 2 MHz. By using a general AC waveform in which the peak current density of the first pulse j/sub 1/ is fixed and the second is varied from +j/sub…
The ionic and electronic conductivities of poly-[1-methyl-3-(pyrrol-1-ylmethyl)pyridinium perchlorate] have been measured as a function of potential in various solvents by impedance spectroscopy. The ionic conductivity of this polymer shows a strong solvent dependence, ranging from 0.31 mS cm–1 in water to 8.0 µS cm–1…
Specimens of breast milk were obtained from each breast in a lactating patient for a 24-hour period after a gadolinium-enhanced MR imaging examination was performed. A quantitative analysis of gadolinium content in specimens obtained at 2, 11, 17, and 24 hours after the intravenous administration of gadopentetate dime…
The X-ray structure of the new fully oxidized isopolyvanadate, (TMA)3H6VV15O42·2.5H2O 1(TMA = tetramethyl-ammonium), prepared by reaction of H2O2 with VOSO4·4H2O shows a bicapped Keggin structure with four-, five- and six-coordinate vanadium atoms; 51V NMR indicates that the same structure has considerable kinetic sta…
The fluorinated ethanols F(n)CH(3-n)CH20H (n = 0-3) form fluorinated ethoxides when adsorbed on oxidized Cu(111), Cu(110), Cu(100), and Ag(110) surfaces. The fluorinated ethoxides decompose at elevated temperatures by Beta- hydride elimination to yield fluorinated acetaldehydes. Inclusion of fluorine in the methyl gro…
Hydrogen silsesquioxane, (HSiO)8, T8, has been synthesized and isolated in synthetically useful quantities. The T8 cage-like structure allows eight pendant groups to be placed symmetrically about the surface of a sphere to form an ‘octopus’ molecule. Using T8 to hydrosilylate compounds with the formula CH2CH(X)nY, oct…
Abstract The structure of a dimeric Keggin-typed polyoxotungstate, [Ge2Ti6W18O77]14−, was investigated by X-ray diffractometry and 183W NMR spectroscopy. K9H5[Ge2Ti6W18O77]·16H2O crystallizes in triclinic a = 17.582(4), b = 22.139(5), c = 12.960(2) Å, α = 101.26(2), β = 94.07(2), γ = 109.20(2)°, V = 4622(4) Å3. The D3…
This paper describes the newly developed specimen hot stage and its applications. The hot stage is designed for high resolution TEM image observation at high temperatures and EDX analysis at room temperature. A fine metal wire is employed as the heating element of the stage and battery is used as the heating power sou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic study on chemical oxidation of leucoemeraldine base polyaniline to emeraldine baseDoo Kyung Moon, Masahiro Ezuka, Tsukasa Maruyama, Kohtaro Osakada, and Takakazu YamamotoCite this: Macromolecules 1993, 26, 2, 364–369Publication Date (Print):January 1, 1993Publication…
Acetylene, methylacetylene and ethylacetylene interact with the Brønsted acid sites of H-ZSM5 with the formation of hydrogen-bonded (precursor) species characterized by well defined IR properties. These precursors are then protonated to give intensely coloured carbocationic species. The speed of protonation is in the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of manganese-copper complex MnCu(obbz)(H2O)3.cntdot.DMF (obbz = N,N'-oxamidobis(benzoato) and DMF = dimethylformamide), a precursor of the molecular-based magnet MnCu(obbz).cntdot.H2O with Tc = 14 KFrancesc Lloret, Miguel Julve, Rafa…
Preface. Introduction. 1. Dynamic Stability of Crystallization - the Basis of Shaped Crystal Growth. 2. The Czochralski Technique. 3. Techniques of Pulling from Shaper. 4. The Verneuil Technique. 5. The Floating-Zone Technique. 6. Radial Instability of Vapor Whiskers. 7. Stability of Cylindrical Pore Growth. 8. Two Sh…
A series of progressively acid-treated montmorillonite clays and a range of porous silicas are tested for their effectiveness as supports for ZnCl2 alkylation catalysts. Support materials are characterised in terms of surface areas, pore volumes and pore size distributions, in an attempt to identify surface properties…
What are carbon-carbon composites and what do they offer, C. Thomas the importance of fibre type and fibre surface in controlling composite properties, E. Walker matrix precursors for carbon-carbon composites, B. Rand manufacturing considerations for carbon-carbon, R. Fisher multidirectional reinforced carbon-carbon,…
We present the analysis of static properties of a simple phenomenological model of antiferroelectric liquid crystals, capable of explaining some different sequences of phase transitions found experimentally. Stability analysis shows the existence of three simply modulated phases. Results are summed up in phase diagram…
Since their discovery in 1984, several thousand papers have been published dealing with various aspects of quasicrystals. Despite this flurry of activity, questions concerning the development, structure, and physical properties of this new phase remain only partially answered. This article reviews investigations of th…
Raman scattering has been carried out on PbTiO3 thin films prepared on platinum-coated (100) silicon by radio-frequency (rf)-magnetron sputtering without substrate heating and a post-deposition thermal treatment. The Raman spectra obtained from the thin film are characteristic of powder Raman spectra: In comparison wi…