Materials Literature
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A crystalline orientated interatomic-potential model, including the directionality of Si—O bonds, has been applied in molecular-dynamics simulations of the atomic-scale structures of x[yNa2O·(1 –y)K2O].(1 –x)SiO2 glasses. The structures of the mixed-alkali-metal silicate glasses were investigated both as a function of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure functionalization of diaza-crown ethers: new synthesis of silver(1+) ion-specific bindersHiroshi Tsukube, Hiroyuki Minatogawa, Megumi Munakata, Mitsuo Toda, and Kiyoshi MatsumotoCite this: J. Org. Chem. 1992, 57, 2, 542–547Publication Date (Print):January 1, 19…
Als Ausschnitte aus der V 2 O 5 ‐Schichstruktur (Bild rechts; verbrückende O‐Atome große schattierte, terminale O‐Atome große weiße und V‐Atome kleine weiße Kugeln) lassen sich die im Titel erwähnten, in jüngster Zeit hergestellten, neuartigen Polyvanadat‐Strukturen beschreiben und systematisieren. Diese im Gegensatz…
New phthalocyanines (M = Cu, Zn, Ni, Co or 2H) substituted with four 17-membered trioxadiaza macrocycles have been prepared. Detosylation of aza groups with concentrated sulfuric acid simultaneously leads to sulfonated groups on the aromatic rings of the macrocyclic substituents. While the N-tosylated derivatives are…
The optical properties of doped columnar phases formed either by a 1 : 1 mixture of an electron donor [2,3,6,7,10,11-hexa-(n-pentyloxy)triphenylene] and an electron acceptor (2,4,7-trinitrofluoren-9-one) or by a dimer in which the donor (triphenylene moiety) and the acceptor (trifluorenone moiety) are covalently linke…
Fourier-transform infrared (FTIR) spectra are reported of formic acid and formaldehyde on ZnO/SiO2, reduced Cu/ZnO/SiO2 and reoxidised Cu/ZnO/SiO2 catalyst. Formic acid adsorption on ZnO/SiO2 produced mainly bidentate zinc formate species with a lesser quantity of unidentate zinc formate. Formic acid on reduced Cu/ZnO…
Long-circulating liposomes can be prepared by coating liposome surface with a hydrophilic layer of oligosaccharides, glycoproteins, polysaccharides and synthetic polymers in order to make liposomes “invisible” for scavenger cells of the mononuclear phagocyte system. Incorporation of lipid-anchored poly(ethylene glycol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and dynamics of a rod/sphere composite liquidMark A. Tracy and R. PecoraCite this: Macromolecules 1992, 25, 1, 337–349Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pu…
The structure of the solvated lithium cation in acetone solutions has been investigated using Raman spectroscopy. Two bands at 1220 and 1238 cm–1 have been assigned to two types of asymmetric carbon–carbon stretching vibration of acetone: the former is from the bulk solvent and the latter arises from acetone molecules…
A number of substituted aryloxycyclotriphosphazenes were synthesized and studied, with the objective of meeting the lubricant requirements of the Integrated High Performance Turbine Engine Technology (IHPTET) initiative. These compounds were evaluated for pour point, oxidative stability, and lubricity behavior. Furthe…
Abstract
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix isolation ESR and theoretical investigations of 11B14N11B and 10B14N11B: laser vaporization generationLon B. Knight Jr., Devon W. Hill, T. J. Kirk, and C. A. ArringtonCite this: J. Phys. Chem. 1992, 96, 2, 555–561Publication Date (Print):January 1, 1992Publication His…
BaTiO3-Ni mixed powders were sintered at 1300°C in Ar or air, and the sintering behavior and dielectric properties were investigated. The bulk density of sintered bodies was 95-99% of theoretical. BaTiO3-Ni composites were produced in Ar. When coarse Ni powder (4-7μm) and ultrafine BaTiO3 powder (0.02μm) were used, a…
The crystal structure of the ζ2′ Au-49.5 at%Cd martensite, which has been controversial for 50 years, has been determined by using single crystal data collected by four-circle diffractometer with Mo Kα radiation. The space group is P3, trigonal, which has no center of symmetry. This result is in disagreement with that…
Bone and several other vertebrate mineralized tissues are formed by the organized growth of crystals of carbonated apatite within a matrix of type 1 collagen fibers. The development of this process in isolated fibrils of young turkey leg tendons has been studied by transmission electron microscopy. Collagen banding, p…
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…