Materials Literature
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A survey of the use of cyclo- and poly(phosphazenes) in fire resis tant applications is presented. Where appropriate, synthesis and commercial availability will be indicated. Two fundamentally different approaches, phosphazenes as additives or as intrinsically flame resistant materials, will be discussed. While the fo…
We present a theoretical approach for calculating the fields diffracted by gratings made of highlyconducting wires that have a rectangular shape. The fields between the wires are represented in terms of modal expansions that satisfy the approximated impedance boundary condition. Our results show thatthis procedure is…
The light protein components of silk fibroin were analyzed by Western blotting using polyclonal antibodies against two synthetic peptides that are segment of the light (L-) chain [Yamaguchi et al. (1989) J. Mol. Biol. 210, 127-139] and P25 [Chevillard et al. (1986) Sericologia 26, 435-449], respectively, and against t…
Although descriptions of the effect of stress on spontaneous magnetization within a single domain already exist, there remains no adequate mathematical model for the effects of noncoaxial magnetic field and stress on bulk magnetization in a multidomained specimen. This article addresses the problem and provides a phen…
Abstract Bifunctional telechelics with defined structure can be prepared by oligomerization of oxiranes, β‐butyrolactone and L‐lactide using aluminium Schiff's base complexes as initiators. Chiral initiator (SALCENAlCl) shows a stereoelective character leading to preferential oligomerization of one enantiomer from a r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMesomorphic form of syndiotactic polystyrene as composed of small imperfect crystals of the hexagonal (.alpha.) crystalline formFinizia Auriemma, Vittorio Petraccone, Francesco Dal Poggetto, Claudio De Rosa, Gaetano Guerra, Carla Manfredi, and Paolo CorradiniCite this: Macro…
The role of different inorganic cations of several elements and organic materials in combination with different concentrations of propargyl alcohol (PA) was investigated in an effort to control the dissolution of mild steel in boiling (102 ± 1°C) hydrochloric acid (HCl) solution. Inorganic cations of chromium (Cr6+),…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetrahedral gold cluster [Au4]2+: crystal structure of {[(tert-Bu)3PAu]4}2+(BF4-)2.2CHCl3Edgar Zeller, Holger Beruda, and Hubert SchmidbaurCite this: Inorg. Chem. 1993, 32, 15, 3203–3204Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of backbone flexibility on the transitional properties of side-chain liquid-crystalline polymersC. T. Imrie, F. E. Karasz, and G. S. AttardCite this: Macromolecules 1993, 26, 15, 3803–3810Publication Date (Print):July 1, 1993Publication History Published online1 May 2…
Crystallographers use x-ray spectra to understand the structure of solids and ergodic theorists use spectra of abstract dynamical systems for structural studies; the relation of the two is shown here.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic, photophysical, and redox properties of some meso-substituted free-base porphyrinsHarold N. Fonda, Julanna V. Gilbert, Russell A. Cormier, Julian R. Sprague, Keiko Kamioka, and John S. ConnollyCite this: J. Phys. Chem. 1993, 97, 27, 7024–7033Publication Date (P…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. Bousmina, R. Muller; Linear viscoelasticity in the melt of impact PMMA. Influence of concentra…
Ga2O3 is a purely n-conducting metal oxide at high temperatures. Increasing interest is being shown in this material as the basic material for gas sensors since its electrical conductivity is gas dependent. To investigate its electrical conductivity mechanism in the temperature range between 800 and 1000 °C, conductiv…
We report the resistivity, thermopower, and dc susceptibility of R${\mathrm{NiO}}_{3}$ (R=La,Pr) ceramic samples for 1.4 K\ensuremath{\le}T\ensuremath{\le}300 K. The resistivity of ${\mathrm{LaNiO}}_{3}$ shows a ${\mathit{T}}^{2}$ dependence below 80 K and changes over to a ${\mathit{T}}^{1.5}$ dependence at higher te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature decomposition of some halogenated hydrocarbons using metal oxide/porous carbon catalystsSteven C. Petrosius, Russell S. Drago, Vaneica Young, and Gerald C. GrunewaldCite this: J. Am. Chem. Soc. 1993, 115, 14, 6131–6137Publication Date (Print):July 1, 1993Publ…
The Stokes-Einstein relation D=${\mathit{k}}_{\mathit{B}}$T/(C\ensuremath{\eta}a) (\ensuremath{\eta} is the shear viscosity; D is the diffusion constant; C=6\ensuremath{\pi} for no-slip and 4\ensuremath{\pi} for slip boundary conditions; a is the molecular diameter) holds over a wide temperature range in many liquids.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRheological mechanism and overview of nucleated crystallization kineticsYash P. KhannaCite this: Macromolecules 1993, 26, 14, 3639–3643Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.org/doi/10.…
Cells of Escherichia coli increase greatly the synthesis of a small cytoplasmic protein as soon as the cell growth rate falls below the maximal growth rate supported by the medium, regardless of the condition inhibiting growth. The gene, designated uspA (universal stress protein A), encoding this protein has been clon…
This work was supported by the Comisión Interministerial de Ciencia y Tecnologia (Grant MAT89-0177) and the Institució Valenciana d'Estudis i Investigació. We thank \nthe Spanish Ministerio de Educación y Ciencia for a Grant (CE89-0010-CO2-02) and for a Fellow Grant (to C.J.G.-G).
The crystal structure of bovine seminal ribonuclease, a homodimeric enzyme closely related to pancreatic ribonuclease, has been refined at a nominal resolution of 1.9 A employing data collected on an electronic area detector. The final model consists of two chains containing 1990 non-H atoms, seven sulfate anions and…