Materials Literature
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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…
Abstract 9,9‐Bis[4‐( p ‐aminophenoxy)phenyl]fluorene ( II ) was used as a monomer with various aromatic dicarboxylic acids and tetracarboxylic dianhydrides to synthesize polyamides and polyimides, respectively. The diamine II was derived by a nucleophilic substitution of 9,9‐bis(4‐hydroxyphenyl)fluorene with p ‐chloro…
Besides their technological importance in electromagnetic applications, composites materials made of magnetic metal inclusions in an insulating matrix provide a stringent test of effective medium theories. While there exists numerous experimental and theoretical studies in the long wavelength approximation, that is, w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of lanthanide(III) texaphyrinsJonathan L. Sessler, Tarak D. Mody, Gregory W. Hemmi, and Vincent LynchCite this: Inorg. Chem. 1993, 32, 14, 3175–3187Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Pu…
Alpha decay in Cm‐doped Ca 2 Nd 8 (SiO 4 ) 6 O 2 , Pu‐doped ZrSiO 4 , and natural ZrSiO 4 minerals results in the simultaneous accumulation of point defects and amorphous regions that both contribute to the macroscopic swelling. A composite model for the macroscopic swelling is used to determine the amorphous fraction…
Tissue culture polystyrene (TCPS) supports good attachment of adherent cells whereas unmodified polystyrene (PS) does not, but the mechanism of this difference is not well characterized. We have compared TCPS and PS for the amounts of vitronectin (Vn) and fibronectin (Fn) which adsorb from the fetal bovine serum (FBS)…
The catalytic reaction CO(a)+O(a)→CO2(g) has been studied on Pt(335) using infrared reflection absorption spectroscopy (IRAS) and temperature programmed reaction (TPR) methods. Both dissociative O2 adsorption and CO adsorption occur preferentially on the step sites. It has been found that chemisorbed CO on the (111) t…
We consider the problem of nonlinear thermal-solutal convection in the mushy zone accompanying unstable directional solidification of binary systems. Attention is focused on possible nonlinear mechanisms of chimney formation leading to the occurrence of freckles in solid castings, and in particular the coupling betwee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of aromatic amines with hydrogen peroxide catalyzed by cetylpyridinium heteropolyoxometalatesSigeki Sakaue, Takashi Tsubakino, Yutaka Nishiyama, and Yasutaka IshiiCite this: J. Org. Chem. 1993, 58, 14, 3633–3638Publication Date (Print):July 1, 1993Publication Histo…
β‐Si 3 N 4 powder containing 1 mol% of equimolar Y 2 O 3 –Nd 2 O 3 was gas‐pressure sintered at 2000°C for 2 h (SN2), 4 h (SN4), and 8 h (SN8) in 30‐MPa nitrogen gas. These materials had a microstructure of “ in‐situ composites” as a result of exaggerated grain growth of some β Si 3 N 4 grains during firing. Growth of…
Zirconia–ceria solid solutions of tetragonal symmetry ( t ’ZrO 2 ) containing 30 to 65 mol% ceria were prepared by annealing c ′‐ZrO 2 at 627°C samples sintered at 1660–1760°C, where c ′‐ZrO 2 is defined as a cubic or tetragonal phase whose axial ratio c/a (tetragonality) is equal to 1. The lattice parameters and the…
Zn 2 − x Mn x SiO 4 is an efficient phosphor for plasma display panels. However, it is not usable for TV applications because of its too long decay around 30 ms. In this study, we have investigated the decrease of the decay time of Zn 2 − x Mn x SiO 4 phosphors synthesized by solid‐state reaction. Photoluminescence de…
Abstract This work has reviewed and summarized the present understanding of the fundamental science and chemistry of rubber vulcanization. The future of this area holds much potential. Recent studies have begun to fully elucidate the accelerator and accelerator complex chemistry, and definitively answer questions that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-valent transition metal chemistry. Moessbauer and EPR studies of high-spin (S = 2) iron(IV) and intermediate-spin (S = 3/2) iron(III) complexes with a macrocyclic tetraamido-N ligandKimberly L. Kostka, Brian G. Fox, Michael P. Hendrich, Terrence J. Collins, Clifton E. F…