Materials Literature
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The motion of two gas bubbles in response to an oscillatory disturbance in the ambient pressure is studied. It is shown that the relative motion of bubbles of unequal size depends on the frequency of the disturbance. If this frequency is between the two natural frequencies for volume oscillations of the individual bub…
Abstract λ(BEDT-TSF)2GaCl4 has revealed to be a new organic superconductor, where BEDT-TSF is bis(ethylenedithio)tetraselena-fulvalene. The onset temperature of the superconducting transition was about 9.5 K and the mid-point transition temperature (Tc) was 8 K. The crystal belongs to triclinic system. BEDT-TSF molecu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ab initio MO study of the thermal decomposition of chlorinated monosilanes, SiH4-nCln (n = 0-4)Ming Der Su and H. Bernard SchlegelCite this: J. Phys. Chem. 1993, 97, 39, 9981–9985Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Publi…
Abstract In this paper, the Monte Carlo method for numerically simulating the kinetics and chain‐length distribution in radical polymerization is described. Because the Monte Carlo method is not subject to the assumption of steady‐state, it is particularly suitable for studying the kinetic behaviour before the steady‐…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMono(cyclopentadienyl)titanium complexes as initiators for the living ring-opening polymerization of .epsilon.-caprolactoneJun Okuda and Ilya L. RushkinCite this: Macromolecules 1993, 26, 20, 5530–5532Publication Date (Print):September 1, 1993Publication History Published on…
Monomethoxypolyethylene glycol (mPEG) of average molecular weight 5000 was transformed in a series of synthetic steps to a new activated form of PEG, a stable thiol-protected intermediary, for reaction with cysteine residues in proteins under mild conditions to produce PEG--protein conjugates as possible candidates fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTopology and maximum content of isolated species (Al, Ga, Fe, B, Si, ...) in a zeolitic framework. An approach to acid catalysisD. BarthomeufCite this: J. Phys. Chem. 1993, 97, 39, 10092–10096Publication Date (Print):September 1, 1993Publication History Published online1 May…
The catalytic subunit of cAMP-dependent protein kinase expressed in Escherichia coli is a phosphoprotein. By in vivo labeling with [32Pi]orthophosphate, the sites of phosphorylation were identified as Ser-10, Ser-139, Thr-197, and Ser-338. Two of these sites, Thr-197 and Ser-338, are found in the mammalian enzyme (Sho…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsothermal thickening and thinning processes in low-molecular-weight poly(ethylene oxide) fractions crystallized from the melt. 4. End-group dependenceStephen Z. D. Cheng, Scott S. Wu, Jianhua Chen, Qizhou Zhuo, Roderic P. Quirk, Ernst D. von Meerwall, Benjamin S. Hsiao, Ant…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRemoval of nitrogen monoxide on copper ion-exchanged zeolites by pressure swing adsorptionWen Xiang Zhang, Hidenori Yahiro, Noritaka Mizuno, Jun Izumi, and Masakazu IwamotoCite this: Langmuir 1993, 9, 9, 2337–2343Publication Date (Print):September 1, 1993Publication History…
Abstract Dispersion of clay affects soil physical properties and can result in clay transport with surface runoff or with percolating water moving through soil macropores. The water‐dispersihle fine clay (<0.2 µm) is probably the most mobile fraction with percolating water. This study was conducted to characterize…
A new type of passivity in carbon (C) steels that occurs in the correct range of carbon dioxide (CO2) bicarbonate (HCO3–), sodium chloride (NaCl), and potential was discovered. C steels normally become passive at about -0.65 VSCE in sodium bicarbonate (NaHCO3) solutions. In sodium chloride (NaCl) solutions, pitting oc…
Six samples of congruently melting lithium niobate (∼Li0.95Nb1.01O3) have been examined by powder x-ray diffraction for the occurrence of niobium antisite defects (niobium on lithium sites). Contrary to current thinking, we have found no evidence for the occurrence of high concentrations of such defects, which also re…
Abstract The perfectly alternating ethylene carbon monoxide copolymer (polyketone; POK) has been studied by means of 1 H nuclear magnetic resonance and thermal analysis, and the crystal structure, determined by wide angle x‐ray scattering methods, is presented. The crystal structure of this polymer in well‐oriented fi…
Polymer chains are irreversibly grafted to a surface in a good solvent and the solvent quality is then reduced dramatically. The chains then collapse. If the grafting density is very high then the collapsed layer should be fairly uniform. However, at lower grafting densities the chains are predicted to form surface “m…
Effects of temperature on stress corrosion crack growth rates were studied on three heats of sensitized type 304 (UNS S30400) stainless steel (SS) and one heat of sensitized alloy 600 (UNS N06600). Data were obtained using reversed direct current (DC) potential drop crack length monitoring on 25-mm compact-type (CT) s…
It is generally known that secondary cellulose acetate (with 53 to 56% acetyl groups) is suitable for thermoplastic processing. With appropriate plasticizers a plastic material is obtained which excels in transparency and pleasant texture, and it is therefore often used for tool handles, combs, spectacle frames, and t…
It has been proposed that the binding of Zn2+ to alpha-lactalbumin switches the conformation to one akin to a state intermediate in the folding of the protein. However, the high resolution x-ray crystal structure of human alpha-lactalbumin-Zn2+ complex at 1.7-A resolution (pH 7.6) does not reveal any significant chang…
The microstructures of alumina‐aluminum titanate (A‐AT) composites have been tailored with the intent of altering their crack‐resistance ( R ‐ or T ‐curve) behavior and resulting flaw tolerance. Specifically, two microstructural parameters which influence grain‐localized crack bridging, viz., (i) internal residual str…
The structure of isocitrate dehydrogenase (IDH) with a bound complex of isocitrate, NADP+, and Ca2+ was solved at 2.5-A resolution and compared by difference mapping against previously determined enzymatic complexes. Calcium replaces magnesium in the binding of metal-substrate chelate complex, resulting in a substanti…