Materials Literature
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Electrocrystallization or even reaction with a copper wire leads to conversion of two 2, 5-disubstituted DCNQIs (1 and 2) into the alloy 3. Such an alloy displays metallic conductivity. Moreover, the phase transformation that normally causes the pure components to become semiconductors upon cooling can be suppressed t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a bis(oxo)-bridged MN(III)Mn(III) complex, bis(.mu.-oxo)bis[N,N'-bis((6-methylpyrid-2-yl)methyl)ethane-1,2-diamine]dimanganese(III) perchloratePatricia A. Goodson and Derek J. HodgsonCite this: Inorg. Chem. 1989, 28, 18, 3606–3608Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure of sulfate species on magnesium oxideM. Bensitel, M. Waqif, O. Saur, and J. C. LavalleyCite this: J. Phys. Chem. 1989, 93, 18, 6581–6582Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 September 1989htt…
The hdc gene coding for the pyridoxal 5'-phosphate dependent histidine decarboxylase from Morganella morganii has been expressed in Escherichia coli under control of the lac promoter. The enzyme accumulates to 7-8% of total cell protein and is purified to homogeneity by passage through three columns. Fourteen site-dir…
With the development of new ceramic materials, including those for structural applications, there is an increasing demand to join, ceramic components to metal structures. One of the major problems of joining ceramic to metal is the thermal expansion mismatch between them. Generally, the ceramic materials have lower th…
Abstract The interaction between oppositely charged linear and crosslinked polyelectrolytes and the molecular mechanism of the transport of linear polyelectrolytes into oppositely charged gels were studied. The mechanism represents a “relay‐race” transfer of polyion segments from one fragment of the polyelectrolyte ne…
Plastics degrade through the influence of such factors as the sun's radiation, temperature, humidity, rain, the oxygen content of the air, and atmospheric pollutants. The most deleterious of these effects is radiation, which is responsible for breaking up polymer chains. The sun emits a complete spectrum of energy rad…
We present a report of our analysis of wave vector dependence of the static dielectric function of a dipolar liquid obtained by a microscopic calculation. At low values of the wave vector (k), the longitudinal dielectric function ε(k) increases with k, in contradiction to some assumptions reported in the literature. A…
Abstract A simple and efficient procedure for the preparation of water-soluble chitin was developed by controlled partial N-acetylation of chitosan. Acetylated chitosans with about 50% substitution prepared in a highly swelled state exhibited high water-solubility, and the procedure proved much superior to the convent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural and theoretical characterization of a nickel(0) complex of tribenzocyclyne (TBC) and the preparation of a novel organometallic conductorJoseph D. Ferrara, Auro A. Tanaka, Cristian Fierro, Claire A. Tessier-Youngs, and Wiley J. YoungsCite this: Organo…
The glass formability and magnetic properties of rapidly solidified Co-Zr-B alloys were investigated in the composition range Co/sub 80/Zr/sub x/B/sub 20-x/ (2>
The mechanical denaturation process of silk fibroin is examined by Raman spectroscopy. The fresh silk fibroins from the middle gland of mature silkworms are drawn to various ratios on a tensile tester ( R = l drawn / l initial , where l is length) and their conformations are measured with Raman spectroscopy. Undrawn s…
Emission spectra recorded during thermoluminescence provide a fuller understanding of defect properties. Also, as detailed changes in spectra occur with dose, dose rate and thermal treatments, knowledge of emission spectra will make even simple radiation dosimetry, as well as applications such as archaeological and ge…
Plane strain thermomechanical deformations of a viscoplastic body are studied with the objective of analyzing the localization of deformation into narrow bands of intense straining. Two different loadings, namely, the top and bottom surfaces subjected to a prescribed tangential velocity, and these two surfaces subject…
Corrosion of steel (SIS 1146) by two marine isolates, Serratia marcescens EF190 and a Pseudomonas sp. S9 was investigated by weight loss measurements of metal coupons placed in static batch cultures. Cell suspensions with and without nutrients were compared with cell free extracts of cultures and uninoculated controls…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxamidato complexes. 1. A study of the formation of complexes between copper(II) and H2pmox (H2pmox = N,N'-bis(2-pyridylmethyl)oxamide). Synthesis, crystal structure, and magnetic properties of the alternating-chain compound [Cu2(pmox)(H2pmox)(H2O)2](NO3)2.cntdot.8H2OFrances…
A non‐Arrhenius segregation isotherm is derived which includes the change in the heat of segregation with surface coverage due to impurity—impurity interactions. It is shown that a linear dependence of log ( X s ) on the reciprocal temperature, where X s is the surface atomic ratio, can derive either from a constant h…
A porous glass‐ceramic in the CaO–TiO 2 —P 2 O 5 system has been prepared by crystallization and subsequent chemical leaching of the corresponding glass. By applying a two‐step heat treatment to 45CaO · 25TiO 2 · 30P 2 O 5 glasses containing a few mol% of Na 2 O, volume crystallization results in the formation of dens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution and solid state characterization of europium and gadolinium Schiff base complexes and assessment of their potential as contrast agents in magnetic resonance imagingPaul H. Smith, J. R. Brainard, D. E. Morris, G. D. Jarvinen, and R. R. RyanCite this: J. Am. Chem. Soc…
We show that a sufficiently large ac electric field reorients the smectic layers irreversibly in chiral smectic-C liquid crystals. Using uniformly aligned samples, prepared by unidirectional buffing, it is demonstrated that at a given temperature the layers tilt away from the buffing axis, b^, by an angle equal to the…