Materials Literature
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The witA gene located between pss and rrnG on the Escherichia coli chromosome encodes a 432-amino acid protein. It is homologous to a human hepatoma glucose transporter and to E. coli membrane proteins that transport citrate (CitA), arabinose (AraE), and xylose (XylE), and, like these carrier proteins, WitA also conta…
Composite crystals are crystals that consist of two or more subsystems, in first approximation each one having its own three-dimensional periodicity. The symmetry of these subsystems is then characterized by an ordinary space group. Due to their mutual interaction the true structure consists of a collection of incomme…
Atomistic studies of stacking faults and dislocation cores in several h.c.p. metals have been carried out using recently constructed empirical many-body potentials. These potentials are fitted so as to reproduce the correct c/a ratios and allow us to study the effect of the deviation from close packing upon the disloc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of [M(N-methylimidazole)6]S8 (M = manganese, iron, nickel, magnesium). Polysulfide salts prepared by the reaction N-methylimidazole + metal powder + sulfurSomanath Dev, Emannuel Ramli, Thomas B. Rauchfuss, and Scott R. WilsonCite this: Inorg. Chem. 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of (micro)phase separation during fast, bulk copolymerization: some synchrotron SAXS experimentsAnthony J. Ryan, Wayne R. Willkomm, Todd B. Bergstrom, Christopher W. Macosko, Jeffrey T. Koberstein, Chung Chien Yu, and Thomas P. RussellCite this: Macromolecules 1991,…
The temperature dependence of the first sharp diffraction peak (FSDP) in the neutron structure factor has been measured from room temperature to 1036 \ifmmode^\circ\else\textdegree\fi{}C. With increasing temperature, the FSDP decreases in amplitude in a normal fashion. This is in contrast to the anomalous temperature…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular engineering of liquid crystalline polymers by living polymerization. 10. Influence of molecular weight on the phase transitions of poly{ι-[(4-cyano-4'-biphenylyl)oxy]alkyl vinyl ether}s with nonyl and decanyl alkyl groupsVirgil Percec and Myongsoo LeeCite this: Mac…
Abstract New transparent flexible hybrid network “ceramer” materials have been synthesized by incorporating triethoxysilane capped polytetramethylene oxide with highly reactive titanium isopropoxide or zirconium n ‐propoxide without adding chelating agents. Both of these types of ceramer materials display high transpa…
The porphyrin rings in the porphyrin dimer 1 are nearly planar, but they are considerably tilted toward each other. Compound 1 is of interest as a model for the special pair of the photosynthetic reaction center. The average distance between the two porphyrin planes is only 3.43 Å. The resulting strong interactions—re…
A successful technique for electroejaculation with nonmetallic electrodes cut from defibrillation pads is described. Twenty-six adult male cynomolgus and eleven adult male rhesus macaques were electroejaculated while immobilized with chair restraint. From 123 attempted electroejaculations in both species of macaques,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic polyphosphazenes with spiropyran unitsHarry R. Allcock and Chulhee KimCite this: Macromolecules 1991, 24, 10, 2846–2851Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https://pubs.acs.org/doi/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical, electrochemical, and chemical formation of the .pi.-cation-radical species of magnesium phthalocyanine. Analysis of the absorption and MCD spectra of [MgPc(-1)].bul.+Edward Ough, Zbigniew Gasyna, and Martin J. StillmanCite this: Inorg. Chem. 1991, 30, 10, 2301…
Abstract The chemistry of the catalyst‐cocatalyst interaction was investigated in systems containing different internal/external donor pairs. Qualitatively similar results were obtained with the ethyl benzoate/methyl p ‐toluate (EB/MPT) and dibutyl phthalate/triethoxy(phenyl)silane (DBP/EPS) systems, which thus were a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLong-lived photoinitiated charge separation in carotene-diporphyrin triad moleculesDevens Gust, Thomas A. Moore, Ana L. Moore, Feng Gao, David Luttrull, Janice M. DeGraziano, Xiaochun C. Ma, Lewis R. Makings, Seung Joo Lee, and Cite this: J. Am. Chem. Soc. 1991, 113, 10, 363…
A valence force field for free-base porphine (H<sub>2</sub>P) is developed from a recently reported Ni-porphine (NiP) force field (Li, X.-Y.; et al. J. Phys. Chem. 1990, 94, 31-47). It allows for force constant adjustments related to bond length changes indicated by X-ray diffraction studies. All fundamental frequenci…
Properties of new homologous series of low molecular mass thermotropic liquid crystals containing non-linear mesogenic cores, 2,5-thiophene (T) and 2,2′-bithio-phene (BT), are presented for the purpose of refining molecular structural prerequisities for liquid crystallinity. Herein we focus on the effect of core linea…
Abstract High‐surface‐area, Zr‐pillared, layered clays are synthesized and characterized for their adsorption properties. Although large free interlayer spacings are claimed in the literature (as also found in this work, 14.3 Å), the limiting pore size is the narrow interpillar spacing. The distribution of interpillar…
An efficient and stable eigenmode method is presented for the analysis of dielectric gratings of arbitrary profiles and thicknesses. The solution is expanded in terms of multiple sets of modes. The method differs from the usual eigenmode methods in that mode couplings are achieved through an iterative one-way wave mul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanum copper tin oxide (La2CuSnO6): a new perovskite-related compound with an unusual arrangement of B cationsMark T. Anderson and Kenneth R. PoeppelmeierCite this: Chem. Mater. 1991, 3, 3, 476–482Publication Date (Print):May 1, 1991Publication History Published online1…
Single crystals have been successfully grown by floating-zone melting of an intermetallic compound Ti3Al which has the β- to α-phase transformation at about 1453 K. Single-crystal specimens of three major orientations were compressed in a temperature range from 300 to 1273 K and examined for the deformation characteri…