Materials Literature
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Abstract A joint project of different european aircraft manufacturers involves the investigation of the involvement of microorganisms in corrosion damage in aircraft. In a first step, the microflora of corrosion failures was investigated. Swab samples were taken from corroded sites and were cultured on different media…
Lead titanate particles of controlled size around the nanometer range were prepared by hydrolyzing a mixture of the constituent metal alkoxides. The hydrolysate powder was crystallized by calcination into a tetragonally distorted perovskite structure. The hydrolysate started to crystallize by calcination at 470° C for…
The amount of IIAGlc, one of the proteins of the phosphoenolpyruvate:glucose phosphotransferase system (PTS), was modulated over a broad range with the help of inducible expression plasmids in Salmonella typhimurium. The in vivo effects of different levels of IIAGlc on glycerol and maltose metabolism were studied. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Organic Chemical Partition in Soils. 1. Development of a General Partition Model and Application to Linear IsothermsFrank C. Spurlock and James W. BiggarCite this: Environ. Sci. Technol. 1994, 28, 6, 989–995Publication Date (Print):June 1, 1994Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-Temperature Tunneling in the Spin-State Relaxation Dynamics of Iron(III) Spin-Crossover CompoundsSabine Schenker and Andreas HauserCite this: J. Am. Chem. Soc. 1994, 116, 12, 5497–5498Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Publ…
Abstract Competition between phase separation and transesterification in immiscible polymer blends of polycarbonate (PC) and a copolyester (PET) is studied as a function of time and temperature by differential scanning calorimetry (DSC) and small‐angle neutron scattering (SANS). We found that (1) Global structure coar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic study of the carboxymethylation of celluloseTapio Salmi, Daniel Valtakari, Erkki Paatero, Bjarne Holmbom, and Rainer SjoholmCite this: Ind. Eng. Chem. Res. 1994, 33, 6, 1454–1459Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Exchange Kinetics of Chemically Different PolymersJ. C. Dijt, M. A. Cohen Stuart, and G. J. FleerCite this: Macromolecules 1994, 27, 12, 3229–3237Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://p…
The dynamic mechanical and infrared spectroscopic investigation of ionomer blends of poly-(diacety1ene)-a nd polystyrene-based ionomers has shown that miscibility of this usually incompatible polymerpair can be achieved through ion-ion interactions between the blend components. Microphase separationis prevented throug…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvolution of Crystalline Structures of Poly(.epsilon.-caprolactone)/Polycarbonate Blends. 1. Isothermal Crystallization Kinetics As Probed by Synchrotron Small-Angle X-ray ScatteringY. Wilson Cheung, Richard S. Stein, Benjamin Chu, and Guangwei WuCite this: Macromolecules 19…
The enzyme CoA transferase (succinyl-CoA:3-ketoacid coenzyme A transferase [3-oxoacid CoA transferase], EC 2.8.3.5) is essential for the metabolism of ketone bodies in the mammalian mitochondrion. It is known that its catalytic mechanism involves the transient thioesterification of an active-site glutamate residue by…
Electrochemical Behavior of Polyaniline‐Poly(styrene sulfonate) Composite Films in Organic Electrolyte Solutions, Morita, Masayuki, Miyazaki, Seijiro, Tanoue, Hiroyuki, Ishikawa, Masashi, Matsuda, Yoshiharu
The crystal structure of kombatite, Pb,o(voo),o,clo, a : 12.682(2), b : 22.566(5), c : r r . 279 (2 ) A , B : l l s . l l ( l f , v : 2847 ( l ) [ t , 7 :4 , C2 /c , has been so l ved by d i rec t methods and refined to an R index of 9.00/o using MoKa X-ray data. There is one unique V position tetrahedrally coordinate…
High-quality sizable single crystals of the radical compound 2,4,6-triphenylverdazyl (TPV) have been prepared and their magnetic properties investigated by neutron-diffraction and magnetization measurements. Neutron-diffraction peaks corresponding to long-range antiferromagnetic ordering have been observed below the N…
A two-dimensional dynamics model for the motion of fibers in an accelerating laminar air flow is presented. Nonlinear model equations for each fiber include effects of inertia, air drag, and flexural rigidity. This rigidity, or stiffness, acts in such a way that a curled or hooked fiber resists being straightened. Ran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of Metal-meso-Octaethylporphyrinogen Complexes Leading to Novel Oxidized Forms of Porphyrinogen Other than Porphyrins. 1. The Redox Chemistry of Nickel(II)- and Copper(II)-meso-Octaethylporphyrinogen Complexes Occurring with the Formation and Cleavage of a Cyclopro…
Cluster models of increasing complexity have been used to model magnetic interactions in KNiF3. These clusters contain two or four magnetic centers plus the bridge F− anions and different representations of the remaining of the crystal. The magnetic coupling constant has been obtained by computing ab initio wave funct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonte Carlo Simulation of Polymer Network Formation with Complex Chemical Reaction Mechanism: Kinetic Approach on Curing of Epoxides with AminesKuo-Chung Cheng and Wen-Yen ChiuCite this: Macromolecules 1994, 27, 12, 3406–3414Publication Date (Print):June 1, 1994Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrene Sorption in Organic-Layered Double-Metal HydroxidesPrabir K. Dutta and Daniel S. RobinsCite this: Langmuir 1994, 10, 6, 1851–1856Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10…
The optical absorption coefficient at room temperature has been measured for cerium-doped Y2O3 and Y1.4Gd0.6O3 samples from 1500 to 45000 wave numbers. Diffuse reflectivity has been measured on cerium-doped powders of Y2O3, Lu2O3, Sc2O3, Ba2GdTaO6, and ThO2 over the same range. A number of 4f − 4f and 4f − 5d transiti…