Materials Literature
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Abstract N-Alkyl imidazoles are effective axial ligands to achieve highly enantioselective epoxidation of unfunctionalized olefins by combined use of molecular oxygen and pivalaldehyde with optically active Mn(III)-salen-type complex catalysts. In the presence of N-alkyl imidazole, the epoxidation of 2,2-dimethylchrom…
In order to elucidate the role of the aromatic ring in recognition of the sugar ring, Trp-62 of hen egg white lysozyme, which is proposed on the basis of x-ray crystallography data to make contact with a sugar ring through van der Waals interaction, was replaced with aliphatic amino acids (Leu, Ile, Val, and Ala) and…
Studies of binding of substrates and inhibitors of the enzyme D-xylose isomerase show, from X-ray diffraction data at 1.6-1.9 A resolution, that there are a variety of binding modes. These vary in the manner in which the substrate or its analogue extend, on binding, across the carboxy end of the (betaalpha)(8)-barrel…
Abstract The principal features of models of structural relaxation in the glassy state were reviewed. The concepts of fictive temperature as the structural parameter and nonexponentiality and nonlinearity of structural relaxations were described. Various expressions for the structural relaxation time were presented an…
The catalytic domain of Schizosaccharomyces pombe casein kinase-1 (the product of the cki1 gene) has been overexpressed in Escherichia coli, purified by chromatographic methods, characterized in vitro, and crystallized in the presence and absence of nucleotide substrate. The best crystals belong to the trigonal space…
Abstract Homopolymeric polyacrylonitrile and fibre‐forming copolymers containing either vinyl acetate or methyl acrylate comonomer have been studied by thermal analysis (DSC, TGA and DTG) at various heating rates (10–100 K min −1 ) and under air and nitrogen. Three well‐defined pyrolysis stages have been observed whic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst Observation of the Converse Flexoelectric Effect in Bilayer Lipid MembranesA. T. Todorov, A. G. Petrov, and J. H. FendlerCite this: J. Phys. Chem. 1994, 98, 12, 3076–3079Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published iniss…
Part of the Al[sbnd]Ni[sbnd]Fe alloy system, including the region of the decagonal phase, was studied by scanning electron microscopy, energy-dispersive X-ray analysis, X-ray diffractometry and transmission electron microscopy. The decagonal phase is thermodynamically stable in a narrow compositional range around Al71…
A die pressing test was developed for quick and inexpensive estimation of the agglomerate strength of ceramic powders. The critical nominal pressure ( p c ) at which contact areas between agglomerates start to increase rapidly was found from the relationship between change in sample height and applied pressure in unia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Assembly of Novel Covalent, Extended Structures Based on [AsxSy]n- Building Blocks Derived from Condensation of AsS33-. Isolation of (Ph4P)2[InAs3S7] and (Me4N)2Rb[BiAs6S12]Jun-Hong Chou and Mercouri G. KanatzidisCite this: Inorg. Chem. 1994, 33, 6, 1001–1002Pub…
Molecular-dynamics simulations of stress relaxation have been performed for models of metals and polymers. A method that employs coupling between the simulation cell and an applied stress as well as an external thermal bath has been used. Two-dimensional models of the materials are defined with interactions described…
Author: Zamir, S. et al.; Genre: Journal Article; Issued: 1994; Title: MOLECULAR ORDERING AND DYNAMICS IN THE COLUMNAR MESOPHASE OF A NEW<br/> DIMERIC DISCOTIC LIQUID-CRYSTAL AS STUDIED BY X-RAY-DIFFRACTION AND<br/> DEUTERIUM NMR
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCO Oxidation on Palladium. 2. A Combined Kinetic-Infrared Reflection Absorption Spectroscopic Study of Pd(111)Janos Szanyi, W. Kevin Kuhn, and D. Wayne GoodmanCite this: J. Phys. Chem. 1994, 98, 11, 2978–2981Publication Date (Print):March 1, 1994Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of Crosslinking on the Molecular Relaxation of an Amorphous Copolymer Near Its Glass-Transition TemperatureJoachim K. W. Glatz-Reichenbach, Louis Sorriero, and John J. FitzgeraldCite this: Macromolecules 1994, 27, 6, 1338–1343Publication Date (Print):March 1, 1994P…
The Raman spectra of both the NAD-pyruvate and the pyridine aldehyde adenine dinucleotide (PAAD)-pyruvate bound to pig heart, pig muscle, and Bacillus stearothermophilus lactate dehydrogenases were measured and are nearly the same, which is consistent with the conserved shell of residues surrounding the active-site ca…
This paper summarises the properties of archiral and chiral liquid crystalline (LC) elastomers, the latter of which have found interest due to their piezoelectric properties. In addition the formation of new LC elastomers by a radical polymerization of acrylate groups covalently linked to LC polymers was investigated.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPacking Characteristics of Crystalline Monolayers of Fatty Acid Salts, at the Air-Solution Interface, Studied by Grazing Incidence X-ray DiffractionC. Boehm, F. Leveiller, D. Jacquemain, H. Moehwald, K. Kjaer, J. Als-Nielsen, I. Weissbuch, and L. LeiserowitzCite this: Langmu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-Sensing Mechanism of Phthalocyanine Langmuir-Blodgett FilmsHong-Ying Wang and Jerome B. LandoCite this: Langmuir 1994, 10, 3, 790–796Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://doi.org/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDensity functional theory predictions of polarizabilities and first- and second-order hyperpolarizabilities for molecular systemsNobuyuki Matsuzawa and David A. DixonCite this: J. Phys. Chem. 1994, 98, 10, 2545–2554Publication Date (Print):March 1, 1994Publication History Pu…
Summary The sorption of phosphate on amorphous aluminium hydroxides was investigated using 27 Al and 71 P solid‐state magic‐angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, following the effect of different exposures to soluble phosphate. The spectra obtained were compared with the spectrum of amorpho…