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Abstract Blends of bisphenol‐A polyarbonate (PC) and poly(ethylene terephthalate) (PET) has been investigated by differential scanning calorimetry and scanning electron microscopy. Blends were prepared by screw extrusion and solution casting with weight fractions of PC in the blends varying from 0.90 to 0.10. From the…
Single-crystal neutron-diffraction studies of PbTiO3, in its tetragonal (ferroelectric) phase at room temperature, at Tc - 60 K and at Tc - 20 K, and in its cubic phase at Tc+ 2 K, Tc + 50 K and Tc + 100 K, give evidence that the phase transition, at T, = 763 K, is order-disorder in character. In particular, the Pb at…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of the reaction of hydrogen peroxide with a water soluble non .mu.-oxo dimer forming iron(III) tetraphenylporphyrin. 2. The reaction of hydrogen peroxide with 5,10,15,20-tetrakis(2,6-dichloro-3-sulfonatophenyl)porphinato iron(III) in aqueous solutionRick Panicucci a…
Saccharomyces cerevisiae myristoyl-CoA:protein N-myristoyltransferase has been efficiently expressed in Escherichia coli and subsequently purified to homogeneity using phosphocellulose chromatography. The interactions between apoenzyme and its acyl-CoA and peptide ligands were examined by an isoelectric focusing gel s…
Quantum-size crystallites of Zn0.95Cd0.05S in an aqueous colloidal solution were optically excited using intense subpicosecond laser pump pulses tuned to the exciton band. Optical probing in the UV registered saturation and the kinetics of ground-state recovery due to carrier recombination, with lifetimes in the 0.8–3…
A T - E phase diagram of MHPOBC (C 8 H 17 O– - -COO– -COO * CH(CH 3 )C 6 H 13 ) has been obtained by means of the temperature ( T ) dependence of the dielectric constant under a dc biased electric ( E ) field. It is presumed from the T - E phase diagram that there is a temperature range where the field-induced antifer…
(μ-Oxo)bis[octakis(alkoxy)phthalocyaninatoiron (III)] 6a-c are obtained by treatment of the cyclotetramerisation product of 4,5-bis(alkoxy)-phthalonitriles in lithium pentanolate with iron(II) acetate. Compounds 6a-c are reduced to bisaxially coordinated octaalkoxyphthalocyaninatoiron(II) in the presence of ligands su…
Experimental evidence is presented that indicates the occurrence of a temperature-induced neutral-ionic transition occurring at ${\mathit{T}}_{\mathit{c}}$\ensuremath{\simeq}205 K in the mixed-stack organic charge-transfer crystal, 3,3',5,5'-tetramethylbenzidine-7,7,8,8-tetracyanoquinodimethane (TMB-TCNQ). The transit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChlorophyll-porphyrin heterodimers with orthogonal .pi. systems: solvent polarity dependent photophysicsMichael R. Wasielewski, Douglas G. Johnson, Mark P. Niemczyk, George L. Gaines III, Michael P. O'Neil, and Walter A. SvecCite this: J. Am. Chem. Soc. 1990, 112, 18, 6482–6…
Quarterwave plates can be made as holographic gratings in positive photoresist. We studied the effect of the grating period and relief depth on the phase retardation and on the rotation of the polarization of the transmitted light. Experiments were performed with gratings of different periods, which also exhibit an an…
A high-angular-resolution two-circle powder diffractometer equipped with long diffracted-beam collimators has been built at Daresbury Laboratory. The diffractometer has encoders mounted directly on the 2θ and ω axes. These give a nominal angular resolution of 0.1 and 1.0 mdeg respectively. Repeated scans of single pow…
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 Wesley R. Burghardt, Gerald G. Fuller; Transient shear flow of nematic liquid crystals: Manifesta…
Mitochondrial NAD(H)-specific isocitrate dehydrogenase was purified from Saccharomyces cerevisiae for analyses of subunit structure and expression. Two subunits of the enzyme with different molecular weights (39,000 and 40,000) and slightly different isoelectric points were resolved by denaturing electrophoretic techn…
Energy stability theory has been applied to a basic state of thermocapillary convection occurring in a cylindrical half-zone of finite length to determine conditions under which the flow will be stable. Because of the finite length of the zone, the basic state must be determined numerically. Instead of obtaining stabi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology control in electrochemically grown conducting polymer films. 1. Precoating the metal substrate with an organic monolayerIsrael Rubinstein, Judith Rishpon, Eyal Sabatani, Antonio Redondo, and Shimshon GottesfeldCite this: J. Am. Chem. Soc. 1990, 112, 16, 6135–6136P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolated redox centers within microporous environments. 1. Cobalt-containing aluminophosphate molecular sieve fiveConsuelo. Montes, Mark E. Davis, Brendan. Murray, and Mysore. NarayanaCite this: J. Phys. Chem. 1990, 94, 16, 6425–6430Publication Date (Print):August 1, 1990Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolated redox centers within microporous environments. 2. Vanadium-containing aluminophosphate molecular sieve fiveConsuelo. Montes, Mark E. Davis, Brendan. Murray, and Mysore. NarayanaCite this: J. Phys. Chem. 1990, 94, 16, 6431–6435Publication Date (Print):August 1, 1990P…
We present a detailed experimental characterization of an optical storage technique that uses monodomain films of liquid-crystalline polymers (LCP’s). This technique employs the trans–cis isomerization of cyanoazobenzene mesogenic groups of the LCP’s, which is photoinduced in the glassy state. Changes in the molecular…
The twist viscosity has been measured in a binary liquid-crystal mixture above the nematic--smectic-C transition near the nematic--smectic-A--smectic-C multicritical point using the dynamic Fr\'eedericksz deformation and found to exhibit a monotonic divergence. This study also shows that the splay elastic constant has…
The complex [Ni(12-aneN4)(OH2)2](ClO4)2·H2O (12-aneN4 = 1,4,7,10-tetraazacyclododecane) has been prepared and its structure determined. The complex crystallizes in the orthorhombic space group P212121 With a= 11.173(5), b = 11.976(5) and c = 13.969(4) Å. The volume of the unit cell is 1869(1) Å3. The total reflections…