Materials Literature
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Equations governing the flow behavior of Sm-C and Sm-${\mathit{C}}^{\mathrm{*}}$ liquid crystals are derived. It is shown that the general theory for the description of the macroscopic flow properties of the system demands 20 viscosity coefficients. Using thermodynamic arguments, one can show that these coefficients m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Spectroscopy on Dilute Blends of Polyisoprene/Polybutadiene: Effects of Matrix Polybutadiene on the Dynamics of Probe PolyisopreneKeiichiro Adachi, Takao Wada, Tatsuyoshi Kawamoto, and Tadao KotakaCite this: Macromolecules 1995, 28, 10, 3588–3596Publication Date (…
Abstract The surface fractal dimension of commercial rubber-grade carbon blacks and of pyrolytic carbon blacks ( CB p ) was determined using nitrogen sorption data. The CB p were produced by vacuum pyrolysis of used tires at different temperatures and pressures. Commercial carbon blacks and CB p obtained at low pyroly…
In contrast to lysozymes, which undergo two-state thermal denaturation, the Ca(2+)-free form of the homologous alpha-lactalbumins forms an intermediate "molten globule" state. To understand this difference, we have produced a chimera of human lysozyme and bovine alpha-lactalbumin. In the synthetic gene of the former t…
Characterization of the rRNA operon from the obligate intracellular bacterium Coxiella burnetii has determined the order of the rRNA genes to be 16S-23S-5S. A 444-bp intervening sequence (IVS) was identified to interrupt the 23S rRNA gene beginning at position 1176. The IVS is predicted to form a stem-loop structure f…
113 randomly selected frustules of Cyclotella taxa, taken from the plankton of four lakes, have been investigated with respect to variation between the two thecae of each frustule and also variation within and between populations occurring in the different lakes. Multivariate statistical analyses of phenetic similarit…
Isopentenyl diphosphate (IPP) isomerase catalyzes an essential activation step in the isoprene biosynthetic pathway. The Saccharomyces cerevisiae gene for IPP isomerase, IDI1, was recently isolated and characterized (Anderson, M. S., Muehlbacher, M., Street, I. P., Proffitt, J., and Poulter, C. D. (1989) J. Biol. Chem…
The feasibility of grafting poly(methyl acrylate) and poly[1-(methoxycarbonyl) ethylene] onto chitosan, poly-β(1←-4)-2-amino-2-deoxy-d-glucose, was investigated. The grafting reaction was carried out in aqueous solution by using ferrous ammonium sulfate (FAS) in combination with H2O2 as redox initiator. The effects of…
The dependence of the bulk photovoltaic effect (BPE) on illumination intensity and wavelength has been studied in (Pb 0.97 , La 0.03 )(Zr 0.52 , Ti 0.48 ) 1-0.03/4 O 3 ceramics normally sintered at 1200° C for 2 h and then heat-treated in various atmospheres such as nitrogen, air and oxygen at 900° C for 1 h to invest…
A new formulation of the polarizable continuum method (PCM) is presented to describe the electrostatic interaction between molecular solutes and anisotropic media (e.g., liquid crystals, crystalline matrices). The main features of the PCM (ab initio treatment of solute, cavity of arbitrary shape, dielectric reaction d…
Previous analyses of Si 3 N 4 oxidation on the basis of diffusion control by a suboxide layer yielded impossibly high N 2 pressures. Those models assumed interfacial reactions as the oxidation mechanism. However, it is now thought that the oxidation process is in situ substitution of O for N in silicon oxynitride of g…
To analyse the plasticity of quasicrystals a numerical simulation method has been developed by which shear stress is applied to a two-dimensional atomic configuration of Lennard-Jones particles. The method is based on a microconvergence relaxation procedure. We present results of simulations on a simple binary tiling…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Class of Heterocyclic Compounds for Nonlinear OpticsHui Pan, Xuling Gao, Yue Zhang, Paras N. Prasad, Bruce Reinhardt, and Ram KannanCite this: Chem. Mater. 1995, 7, 5, 816–821Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHyaluronic Acid-(Hydroxypropyl)cellulose Blends: A Solution and Solid State StudyVipul Dave, Monica Tamagno, Bonaventura Focher, and Enrico MarsanoCite this: Macromolecules 1995, 28, 10, 3531–3539Publication Date (Print):May 1, 1995Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculated Structures and Electronic Absorption Spectroscopy for Magnesium Phthalocyanine and Its Anion RadicalMarshall G. Cory, Hiroaki Hirose, and Michael C. ZernerCite this: Inorg. Chem. 1995, 34, 11, 2969–2979Publication Date (Print):May 1, 1995Publication History Publis…
Profiles of Bragg reflections from earth-grown crystals of lysozyme from hen egg-white and collagenase from Hypoderma lineatum were directly recorded with a quasi-planar X-ray wave. One crystal of each protein was chosen for a detailed investigation. Each sample is shown to consist of only a few (three and two, respec…
Electron-beam induced deposition represents a new technology for production of three-dimensional nanoscale structures. The properties of the deposited material are determined by the precursor material as well as the deposition parameters. The deposits of very different organometallic precursor molecules show similar m…
Author: Rubin, S. F. et al.; Genre: Journal Article; Issued: 1995; Title: EFFECT OF MESOPHASE ORDER AND MOLECULAR-WEIGHT ON THE DYNAMICS OF<br/> NEMATIC AND SMECTIC SIDE-GROUP LIQUID-CRYSTALLINE POLYMERS
Chemical analyses of surface films and corrosion products formed on pure Cu, Zn, Ni, and Ag samples exposed up to 12 months in various mild indoor environments have been performed by infrared reflection‐absorption spectroscopy (IRAS) and x‐ray photoelectron spectroscopy. The analyses reveal metal carboxylates to be th…
ABSTRACT Thermal polymerization and mechanical degradation rates were measured for wheat gluten and glutenin at 25–30% moisture. Changes in soluble protein and disulfide bonds were measured at 85°C to 180°C, residence times of 2–60 set and shear rates of 10–275 sec ‐l . Polyrnerization rates without shear were evaluat…