Materials Literature
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A texture model suitable for use in Rietveld-refinement programs is proposed. It is based on the series expansion of the pole distribution function in symmetrized harmonics. The model was tested on a textured plate sample of Al 2 O 3 .
The amino acid sequences of the NH2 terminus and internal peptide fragments of a Rhodococcus rhodochrous J1 nitrilase were determined to prepare synthetic oligonucleotides as primers for the polymerase chain reaction. A 750-base DNA fragment thus amplified was used as the probe to clone a 5.4-kilobase PstI fragment co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRosarin: a new, easily prepared hexapyrrolic expanded porphyrinJonathan L. Sessler, Steven J. Weghorn, Takashi Morishima, Miguel Rosingana, Vincent Lynch, and Virgil LeeCite this: J. Am. Chem. Soc. 1992, 114, 21, 8306–8307Publication Date (Print):October 1, 1992Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePerfluorinated polyimide synthesisShinji Ando, Tohru Matsuura, and Shigekuni SasakiCite this: Macromolecules 1992, 25, 21, 5858–5860Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992https://pubs.acs.org/doi/10.1…
Polyaniline (PANI) electrodes with redox capacities >1 C/cm 2 were investigated by in situ electrogravimetry in aqueous electrolytes of pH values varying from <0 to 3 and in nonaqueous, propylene carbonate‐based media. Film mass, volume, and bulk density were determined in situ as a function of electrode potential. Fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of poly(styrenesulfonate) onto an ammonium monolayer on mica: a surface forces studyPeter Berndt, Kazue Kurihara, and Toyoki KunitakeCite this: Langmuir 1992, 8, 10, 2486–2490Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Pub…
C 2 H 2 cristallise dans Pa3, Z=4, avec a T=131, 141K, a o =6.0940,6.1050; et affinement jusqu'a R=0.065,0.052. C 2 D 2 cristallise a T=143K dans Pa3 avec Z=4, a o =6.1020A, et a T=15K dans Acam avec Z=4, a=6.198, b=6.023, c=5.578A. Pour ces deux temperatures, l'affinement atteint R=0.068, 0.081
Recent progress in the field of charge storage and charge transport in polymers irradiated with partially penetrating electron beams is discussed. The analytical model used to describe these phenomena takes the following physical parameters and processes into consideration: charge and energy deposition profiles, ohmic…
The use of an implanted, mass-separated carrier-free 105Ag radiotracer improves the sensitivity for measuring grain-boundary (GB) penetration profiles. In this way the GB self-diffusion coefficient DGB in silver was directly determined from experiments in type-C kinetics conditions. When multiplying the DGB values wit…
The extraction of pure-specimen X-ray diffraction-line broadening is described using a convolution of the instrumental profile and an exact Voigt function. Real Fourier coefficients were computed from the Cauchy and Gauss integral breadths and were input for Warren–Averbach analysis. Smooth surface-weighted and volume…
A force field (MSXX) for molecular dynamics simulations of silicon nitride is derived using the Hessian biased technique from ab initio calculations on N(SiH3)3 and Si(NH2)4 clusters. This is used to model the nitrogen and silicon centers of the α and β forms of crystalline Si3N4 for prediction of crystal structures,…
The metal-insulator transition in the orthorhombic perovskites PrNiO 3 and NdNiO 3 is accompanied by the sudden 3D magnetic ordering of the Ni ions (μ Ni ≈ 0.9 μ B ). The magnetic ground state, described by a commensurate κ = (1/2, 0, 1/2) spin density wave, is unprecedented in a perovskite structure. The coexistence…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, self-assembly, and photophysical dynamics of stacked layers of porphyrin and viologen phosphonatesSolomon B. Ungashe, William L. Wilson, Howard E. Katz, Geoffrey R. Scheller, and Thomas M. PutvinskiCite this: J. Am. Chem. Soc. 1992, 114, 22, 8717–8719Publication D…
From a genomic library of Chromatium vinosum strain D in lambda L47, a 16.5-kbp EcoRI-restriction fragment was identified by hybridization with a DNA fragment harboring the operon for Alcaligenes eutrophus poly(3-hydroxyalkanoate) (PHA) synthesis. This fragment and subfragments thereof restored the ability to synthesi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of high-nuclearity spin clusters. Fourteen- and fifteen-oxovanadium(IV) clustersAnne Laure Barra, Dante Gatteschi, Luca Pardi, Achim Mueller, and Joachim DoeringCite this: J. Am. Chem. Soc. 1992, 114, 22, 8509–8514Publication Date (Print):October 1, 1992P…
The microhardness, H, and Young’s modulus, E, of a polycrystalline diamond film and several amorphous diamondlike carbon (DLC) films were determined from force-displacement curves obtained using an ultralow-load microhardness instrument (UMIS-2000). Measurements were made at a constant loading rate of 3 mN/s, to a max…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase separation kinetics in segmented polyurethanes: effects of soft segment length and structureBenjamin Chu, Tong Gao, Yingjie Li, Jian Wang, C. Richard Desper, and Catherine A. ByrneCite this: Macromolecules 1992, 25, 21, 5724–5729Publication Date (Print):October 1,…
Abstract The Laves phase structures (MgCu 2 MgZn 2 and MgNi 2 types) are adopted by a large number of binary intermetallic compounds of composition AB 2 . These phases belong to the class of tetrahedrally closepacked alloys. Two of the structural features of the Laves phases which have aroused interest are, firstly th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of silicon-containing diphenylacetylenes and high gas permeability of the product polymersKenji Tsuchihara, Toshio Masuda, and Toshinobu HigashimuraCite this: Macromolecules 1992, 25, 21, 5816–5820Publication Date (Print):October 1, 1992Publication History Pub…
From genomic libraries, the polyhydroxyalkanoate gene locus of Pseudomonas aeruginosa PAO1 was cloned and characterised at the molecular level. Two genes coding for polyhydroxyalkanoate synthases, phaC1Pa and phaC2Pa, a polyhydroxyalkanoate depolymerase gene, phaDPa, and four adjacent open reading frames (ORF1, ORF2,…