Materials Literature
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The recent serial section electron microscopic studies by Adamson and Michel (1993) on microves gels of frog mesentery have revealed that the large pores in the junction strand of the interendothelial cleft are widely separated 150 nm wide orifice-like breaks whose gap height 20 nm is the same as the wide part of the…
We present a solution of a modified time-dependent Ginzburg-Landau equation in the limit of infinite order-parameter dimension N. The scalar (N=1) model is believed to describe phase separation in chemically reactive binary mixtures, block copolymers, and other systems where competing short-range and long-range intera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst Observation of a n-Doped Quasi-One-Dimensional Electronically-Conducting Discotic Liquid CrystalNeville Boden, Ruth C. Borner, Richard J. Bushby, and Jonathan ClementsCite this: J. Am. Chem. Soc. 1994, 116, 23, 10807–10808Publication Date (Print):November 1, 1994Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Porphyrin Ring Distortion on Redox Potentials of .beta.-Brominated-Pyrrole Iron(III) TetraphenylporphyrinsKarl M. Kadish, Francis D'Souza, Anne Villard, Marie Autret, Eric Van Caemelbecke, Paola Bianco, Alessandra Antonini, and Pietro TagliatestaCite this: Inorg. C…
A magnetic polymer composite containing γ‐Fe 2 O 3 nanoparticles and prepared from poly(pyrrole‐ N ‐propylsulfonate) by a simple reaction with aqueous NH 4 OH is described. The results of physical characterization by X‐ray powder diffraction and an investigation of the magnetic properties are presented. Such composite…
DSC and X-ray diffraction studies on a series of 1,3-phenylene bis[4-(4-alkoxyphenyliminomethyl)benzoates] are presented. The only mesophase exhibited by the methoxy to hexadecyloxy homologues is of the smectic C type. The reversal of the iminomethyl linkage reduces drastically the incidence of a mesophase; that is, o…
In this paper we introduce a new method for proving area-minimization which we call "paired calibrations." We begin with the simplest application, the cone over the tetrahedron, which appears in soap films. We then discuss immiscible fluid interfaces, crystal surfaces, and one-dimensional networks minimizing other nor…
A pedagogical presentation of the propagation of electromagnetic waves in stratified media is given. The usual 2 × 2 matrix analysis is simplified and generalized. A Bloch factor eigenvalue equation is obtained, valid for all periodic stratifications. The implications of the band structure of an infinite periodic stru…
A new ordered state characterized by non-zero toroidal moment density is described. A review of its electrical and magnetic properties is presented. A second order phase transition to the toroidal state is accompanied by Curie-Weiss behavior of a new type of response function, the toroidal susceptibility, which descri…
An atom is defined as a region of space bound by a surface of local zero flux in the gradient vector field of the electron density. The same boundary condition defines a proper open system, one whose observables and their equations of motion are defined by quantum mechanics. Applied to a crystal, this boundary conditi…
Abstract The existing models based on classical nucleation theory are not able to explain satisfactorily the nucleation phenomenon of microcellular foams in thermoplastics. Here, we extend the analysis of Kweeder (24), who developed a new model that considers the presence of microvoids, resulting from the thermal proc…
With a view to verifying the symmetry of the antiferromagnetic phase of LiCoPO4 crystals, quasi-static and dynamic magnetoelectric (ME) experiments have been undertaken by means of magnetic field induced polarization (MEH effect). After magnetoelectric annealing all nine components of the ME tensor have been tested at…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiamagnetic and Paramagnetic Keggin Polyoxometalate Salts Containing 1-D and 3-D decamethylferrocenium Networks: Preparation, Crystal Structures and Magnetic Properties of [Fe(C5Me5)2]4(POM)(solv)n (POM = [SiMo12O40]4-, [SiW12O40]4-, [PMo12O40]4-, [HFeW12O40]4-; solv = H2O,…
ac and dc conductivities of fast-ion conducting x${\mathrm{Na}}_{2}$S+(1-x)${\mathrm{B}}_{2}$${\mathrm{S}}_{3}$ glasses in the composition range 0.001\ensuremath{\le}x\ensuremath{\le}0.1 were analyzed using the Almond-West formula \ensuremath{\sigma}(\ensuremath{\nu})=${\mathrm{\ensuremath{\sigma}}}_{\mathrm{dc}}$[1+(…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFTIR Identification of the Supported Phases Produced in the Preparation of Silica-Supported Nickel CatalystsM. Kermarec, J. Y. Carriat, P. Burattin, M. Che, and A. DecarreauCite this: J. Phys. Chem. 1994, 98, 46, 12008–12017Publication Date (Print):November 1, 1994Publicatio…
A process to produce a family of novel materials from polycarbonate, having a microcellular structure, is described. The process utilizes the high solubility of carbon dioxide in polycarbonate to nucleate a very large number of bubbles, on the order of 1 to 10 × 109 bubbles/cm3, at temperatures well below the glass tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of NO into NO2 over Active Carbon FibersIsao Mochida, Seiki Kisamori, Motohiro Hironaka, Shizuo Kawano, Yuji Matsumura, and Masaaki YoshikawaCite this: Energy Fuels 1994, 8, 6, 1341–1344Publication Date (Print):November 1, 1994Publication History Published online1…
The Tyr corner is a conformation in which a tyrosine (residue "Y") near the beginning or end of an antiparallel beta-strand makes an H bond from its side-chain OH group to the backbone NH and/or CO of residue Y - 3, Y - 4, or Y - 5 in the nearby connection. The most common "classic" case is a delta 4 Tyr corner (more…
A recombinant strain of Escherichia coli, which overexpressed phaC and phaE from Chromatium vinosum, was used to isolate poly(3-hydroxyalkanoic acid) synthase. The isolation was performed by a two-step procedure including chromatography on DEAE-Sephacel and Procion Blue H-ERD. The poly(3-hydroxyalkanoic acid) synthase…
The protein super‐family of medium‐chain alcohol dehydrogenases (and glutathione‐dependent formaldehyde dehydrogenase), polyol dehydrogenases, threonine dehydrogenase, archaeon glucose dehydrogenase, and eye lens reductase‐active ζ‐crystallins also includes Escherichia coli quinone oxidoreductase, Torpedo VAT‐1 protei…