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ABSTRACT Phosphorus‐rich alkali feldspars were found in three peraluminous highly differentiated albite‐topaz‐Li‐mica granites in the W and S parts of the Bohemian Massif. The average contents of P 2 O 5 in K‐feldspars (Křížovy kámen 0.57 wt%, Homolka 0.77 wt%, and Podlesí 0.83 wt%) are higher than the average content…
We present a rapidly converging, real-space expansion to compute the electrostatic energy of point-charge configurations on a fixed lattice. The rapid convergence is obtained by requiring that the expansion only reproduce well the configurations with energies below some cutoff energy. The convergence rate can be syste…
Abstract Vibrational spectra of two dyes, malachite green and crystal violet are presented. Raman and hyper‐Raman spectra are recorded as surface‐enhanced (hyper‐) Raman spectra on silver colloids. These data are compared to the respective IR spectra with respect to the point group of the molecules (C 2 and C 3 ). The…
The dynamic fatigue characteristics of silica glasses with fictive temperatures of 1000°, 1100°, and 1300°C and soda‐lime glasses with fictive temperatures of 470° and 530°C were measured in air. For both glasses, samples with higher fictive temperatures had a greater fatigue resistance. Inert strength of silica glass…
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…