Materials Literature
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The decoupling of short-range valence-bond states into topologically distinct sectors is discussed. On a square-lattice strip with odd width, this decoupling implies that short-range resonating-valence-bond (RVB) states are doubly degenerate. This result is precisely equivalent to the Lieb-Schultz-Mattis (LSM) theorem…
Abstract The pure γ‐form of isotactic poly(propylene) can be obtained by melt‐crystallization starting from a fraction of a random ethylene‐propene copolymer (ethylene content 4 wt.‐%) soluble in p ‐xylene at 28°C. Some structural models previously reported are tested by comparing calculated wide‐angle X‐ray diffracti…
Large thermally induced changes in the end-interface reflectance and transmittance of silica fibers coated with vanadium dioxide films have been observed.
We report the DNA sequence and in vivo transcription start of pdxB, which encodes a protein required for de novo biosynthesis of pyridoxine (vitamin B6). The DNA sequence confirms results from previous minicell experiments showing that pdxB encodes a 41-kilodalton polypeptide. RNase T2 mapping of in vivo transcripts a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical, theoretical, and ESR characterizations of porphycenes. The .pi. anion radical of nickel(II) porphyceneM. W. Renner, A. Forman, W. Wu, C. K. Chang, and J. FajerCite this: J. Am. Chem. Soc. 1989, 111, 23, 8618–8621Publication Date (Print):November 1, 1989Publi…
Using nuclear extracts from Bombyx mori middle silk glands (MSG) where the sericin-1 (Ser-1) mRNA is produced specifically, we have studied the in vitro transcription of the Ser-1 gene. To determine the sites required for the promoter function of the Ser-1 gene and characterize the factors binding to these sites, the…
Humic substances, the dark-colored, natural organic polyelectrolytes that are found in practically all soils, sediments, and natural water, strongly interact with both inorganic and organic pollutants. Inorganic cationic species generally undergo complexation reactions with humic substances. The binding of cations, su…
Since its development in the early 1970s, synchrotron‐based X ray absorption spectroscopy (XAS) has proven to be a versatile structural probe for studying the local environments of cations in a variety of earth materials ranging from crystalline solids, silicate glasses, and high‐temperature silicate melts to aqueous…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanisms of the thermal dehydration of dilithium sulfate monohydrateNobuyoshi Koga and Haruhiko TanakaCite this: J. Phys. Chem. 1989, 93, 23, 7793–7798Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 No…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe first structural characterization of a nickel(I) macrocyclic system: structure of nickel(I) diphenyldi-p-toyl-21-thiaporphyrinLechoslaw Latos-Grazynski, Marilyn M. Olmstead, and Alan L. BalchCite this: Inorg. Chem. 1989, 28, 22, 4065–4066Publication Date (Print):November…
Abstract 5,10,15,20-tetra(4-sulfonatophenyl)porphin (TSPP) is intercalated into the interlayer space of hydrotalcite by anion exchange. The intercalated porphyrin anions are possibly arranged with the molecular plane perpendicular to the hydroxide layers.
Zinc silicates are important in CRTs and lamp phosphors. Previous work has shown that a sol‐gel‐like method (termed CGUPS) can produce uniform zinc silicate phosphor particles whose surface layer possesses an appropriate activator concentration gradient and exhibits efficient cathodoluminescence (CL). This work furthe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteric influence of the trimethylsilyl group in organic reactionsJih Ru Hwu and Naelong WangCite this: Chem. Rev. 1989, 89, 7, 1599–1615Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989https://pubs.acs.or…
Crystals suitable for X-ray diffraction studies at moderate resolution have been grown from two forms of human chorionic gonadotropin (hCG): HF-treated hCG and neuraminidase-treated hCG. The enzymatically desialylated form of hCG produced crystals that diffract to 2.8 A as compared to the HF-treated hCG crystals that…
Copper(II) pyruvaldehyde bis(N4-methylthiosemicarbazone) ([Cu]PTSM) has shown potential as a flow tracer and can be labeled with the generator-produced positron emitting radionuclide 62Cu as well as with other copper radioisotopes. To define the myocardial handling of [Cu]PTSM, the externally detected single pass extr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical disorder in non-oxide chalcogenide glasses. Site speciation in the system phosphorus-selenium by magic angle spinning NMR at very high spinning speedsDavid Lathrop and Hellmut EckertCite this: J. Phys. Chem. 1989, 93, 23, 7895–7902Publication Date (Print):November 1…
The present work includes twelve invited review papers with comprehensive descriptions of the challenges in six topical areas: analytical fracture mechanics, nonlinear and time-dependent fracture mechanics, microstructure and micromechanical modeling, fatigue crack propagation, environmentally assisted cracking, and f…
Focused ion beam induced deposition of metals has up to now produced films with resistivities 30–5000 times higher than bulk values for metals because of high concentrations of impurities from the precursor gas incorporated into the films. We have demonstrated for the first time deposition of submicron Au films with r…
A chemical potential diagram for A‐B‐O (A, B = metallic elements) systems has been constructed to make visually clear the thermodynamic stability of double oxides; the stability area of metallic elements, their binary oxides, and double oxides can be presented as convex polygons in a log ( a A / a B ) vs log P (O 2 )…
The purpose of this study was to develop a new casting machine for titanium and Ni-Ti alloys. Properties of cast pure titanium and Ni-Ti alloys were studied by means of the tensile and casting tests. As gas in the mold was removed by the mold being heated under a high vacuum, the reaction between the molten metal and…