Materials Literature
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Several cationic porphyrins are known to bind to DNA by intercalative and outside binding modes. This study identifies the cis and trans isomers of bis(N-methyl-4-phridiniumyl)diphenyl porphyrin as DNA intercalators based on evidence from a DNA topoisomerase I assay. Moreover, both isomers are shown to be potent photo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystalline aromatic polyesters derived from 2,5-thiopheneRubing Cai, Jack Preston, and Edward T. SamulskiCite this: Macromolecules 1992, 25, 2, 563–568Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 19…
A new absorbable polymer prepared from polyhydroxybutyrate (PHB) was inserted as a pericardial patch in sheep to serve as a temporary scaffold for regeneration of pericardial tissue. Postoperative adhesions were rare or absent. The present study focuses on characterization of the regenerated surface cells. The luminal…
The effect of the temperature of reduction by H2 of Pd/CeO2 catalysts on the accessibility of the metal to carbon monoxide adsorption has been estimated from a study of the integrated intensity of the ν(CO) absorption bands. No adsorption occurred when the reduction temperature was higher than 673 K; the behaviour of…
Biochemical Aspects of Microbial Oxidation of Inorganic Sulfur Compounds (Susumu Takakuwa). Sulfur Ligand in Metalloproteins and Metalloenzymes (Norikazu Ueyama and Akira Nakamura). Biochemical Reactions Involving Thioesters (Kenji Ogino and Hisashi Fujihara). Biochemistry of Disulfide (Yong Hae Kim). Oxygenation and…
The existence of superconductivity in chiral molecular systems is suggested by studies of the title compound. The work, which is an important extension of studies of recently organic superconductors based on unsymmetrical molecules, shows that a sudden, but incomplete loss of resistivity (by a factor of 500) takes pla…
Ferromagnetism in non-metallic solids is quite a rare property. In solids containing molecular building blocks it is even rarer. One strategy for preparing ionic ferromagnets is to combine a low-dimensional continuous lattice containing transition-metal ions with organic molecular ions. In this article we review the s…
Properties of α-alumina surface, dissociated fraction of polyacrylic acid, and the interaction between alumina surface and polyacrylic acid were investigated in aqueous suspensions in the pH range of 2.2 to 10.5. The isoelectric point of the colloidal α-alumina particles was pH 7.7, and the surface was charged positiv…
For pt.IX see ibid., vol.7, no.6, p.5 et seq. (1991). An overview of engineering practice related to partial discharge (PD) measurements in gas-insulated substations (GISs) is provided. The following questions are addressed: why measure PD in GIS?; in which phases of the life cycle should PD be measured?; what PD meas…
The use of an imaging plate as a two-dimensional (2-D) detector removes many of the difficulties that arise in performing angle-dispersive powder diffraction at high pressures in a diamond-anvil cell. Due to the 2-D nature of the imaging plate, a substantial part of each Debye Scherrer ring is intercepted and recorded…
The introduction of a metal into a mesogenic molecule can result in a complex with interesting electrical and magnetic properties. By reacting the non‐mesogenic cyclic amine shown in the figure with Ni(NO 3 ) 2 · 6H 2 O in absolute THF the first member of a new class of columnar liquid‐crystalline metal complexes with…
The effect of γ\ ightleftarrowsε cyclic transformation on the subsequent γ→ε martensitic transformation has been studied in an Fe-24%Mn-6%Si shape memory alloy in order to obtain fundamental information on the role of Si in the shape memory effect. The γ→ε martensitic transformation is markedly enhanced by the thermal…
We consider three systems containing rigid and/or flexible main-chain nematogenic polymers: mixtures of a rigid and a flexible polymer, mixtures of two different rigid polymers, and a system of diblocks of rigid and flexible pieces. The flexible components are modeled as chains with freely rotating bonds, while the ri…
We have prepared novel colloidal polyaniline–silica composites by chemically polymerising aniline in the presence of small silica particles of 38 ± 7 nm diameter; these composites have been characterised by various techniques including thermogravimetry micoanalyses, scaning, electron microscopy, photon correlation spe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility and phase separation in poly(methyl methacrylate)/poly(vinyl chloride) blends: study of thermodynamics by thermal analysisSunny Shen and John M. TorkelsonCite this: Macromolecules 1992, 25, 2, 721–728Publication Date (Print):January 1, 1992Publication History Pub…
The scanning electrochemical microscope has been used to probe the diffusion layer by measuring the potential difference between a large reference electrode located in the bulk of the solution and a microindicator electrode positioned a few µm away from a substrate electrode. Ag microdiscs (10 and 50 µm diameter) have…
The infrared spectra of CO adsorbed at 77 K on sintered polycrystalline MgO and Ni/MgO, Co/MgO solid solutions, containing 10% nickel and cobalt in atoms are reported. These solids are properly designed for the estimation of the role played by d–π overlap in the bonding between the isolated transition-metal cations an…
Trialkylstannyltetrathiafulvalenes undergo palladium-catalysed cross-and homo-coupling reactions to give aryl-substituted tetrathiafulvalenes and bitetrathiafulvalene; the methodology has been applied to the synthesis of p-phenylenebistetrathiafulvalene and 2,5-thiophenediylbistetrathiafulvalene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThin-film processing and optical properties of conjugated rigid-rod polyquinolines for nonlinear optical applicationsAshwini K. Agrawal and Samson A. JenekheCite this: Chem. Mater. 1992, 4, 1, 95–104Publication Date (Print):January 1, 1992Publication History Published online…
The complete amino acid sequence of glutamate dehydrogenase from the thermoacidophilic archaebacterium Sulfolobus solfataricus has been determined. The sequence was reconstructed by automated sequence analysis of peptides obtained after cleavage by trypsin, cyanogen bromide, Staphylococcus aureus V8 protease and pepsi…