Materials Literature
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To use the structure-forming potential and the biodegradability of cellulose and nonionic cellulose ethers, we developed synthesis pathways for soluble and regenerable silyl celluloses suitable for the design of advanced materials. A 6-0-silylation of cellulose takes place in a heterogeneous phase reaction in the pres…
Nanoporous sensor materials based on tin chalcogenides are shown to respond to be absorption of guest molecules by a measurable deformation of their open‐framework structures which results in changes in heir optical absorption properties. The magnitude and type of deformation depends on the identity of the guest speci…
We have studied heat and mass transfer in wool, cotton, nylon, and polyester fabric beds during steaming. Our mathematical model, which is based on local volume average methods, considers the finite rates of heat and mass transfer between the solid, gaseous, and liquid phases of the system. Experiments involve the ste…
On the basis of known equations for calculating X-ray diffraction intensities from a given number of unit cells of a crystal phase in polycrystalline material, as due to: (i) Bragg reflections; (ii) average diffuse scattering caused by thermal plus first-kind disorder; and (iii) incoherent scattering, a relationship h…
For carbohydrates the GROMOS force field has been extended to a more realistic all-atom model, with the use of parameters from the force field proposed by Ha, Giammona, Field & Brady [Carbohydr. Res. (1988), 180, 207-221]. This extended and modified GROMOS force field has been used to simulate the crystal structures o…
Abstract Die bisher unbekannte Kristallstruktur von Cu 3 SbSe 3 wurde aus Einkristalldaten ermittelt. Die Verbindung kristallisiert orthorhombisch, RG Pnma (Nr. 62) mit a = 7,9865(8), b = 10,6138(9) und c = 6,8372(7) Å, V = 579.6(1) Å 3 , Z = 4. Die Struktur zeichnet sich durch Baugruppen [Cu 3 Se 8 ] aus drei cis‐kan…
Previous publications have demonstrated the presence of a cryptic gene encoding a novel Enzyme I of the phosphoenolpyruvate:sugar phosphotransferase system (PTS). Recent Escherichia coli genome sequencing revealed a gene (ptsA) encoding a new Enzyme I homologue in the 89.1-89.3 centisome region. We have analysed this…
A laser technique was used to initiate single corrosion pits as well as geometrically ordered arrays of pits on Al (99.999%) immersed in 1 M NaCl at pH 11. The current was measured during potentiostatic growth and, upon termination of each experiment, the shape of each pit was recorded. It was found that single pits h…
The crystal structure of the room-temperature metastable phase of 2-oxo-1-pyrrolidineacetamide (piracetam), C 6 H 10 N 2 O 2 , has been solved using the atom-atom potential method and refined by Rietveld refinement from powder diffraction data collected with a curved position-sensitive detector (INEL CPS 120) using De…
His343 in Citrobacter freundii tyrosine phenol-lyase is conserved in all known sequences of both tyrosine phenol-lyase and tryptophan indole-lyase; it is located near the active-site Lys257 in C. freundii tyrosine phenol-lyase [Antson, A. A., Demidkina, T. V., Gollnick, P., Danter, Z., Von Tersch, R.L., Long, J., Bere…
Polyurethane (PU) sheets and foams having plant components in their network were prepared by using the following procedure. Polyethylene glycol (PEG) was mixed with one of the following; molasses, lignin, woodmeal, or coffee grounds. The mixture obtained was reacted with diphenylmethane diisocyanate (MDI) at room temp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTopological and Nontopological Rearrangement in Crystal Lattice of Cholic Acid Inclusion Complex Induced by Guest ExchangeMotonari Shibakami, Masanori Tamura, and Akira SekiyaCite this: J. Am. Chem. Soc. 1995, 117, 16, 4499–4505Publication Date (Print):April 1, 1995Publicati…
The phase diagram of the sodium dodecylsulphate/decanol/water system is studied by2H NMR spectroscopy in the range between the calamitic nematic (N+ C) and discotic nematic (N− D) phases. In this narrow range a nematic biaxial phase (NBX) is observed. The phase transitions between the nematic phases are all of first o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence Quenching of Copper(II) Porphyrins with Lewis BasesFang Liu, Kurstan L. Cunningham, Wendy Uphues, Gerald W. Fink, Johnathan Schmolt, and David R. McMillinCite this: Inorg. Chem. 1995, 34, 8, 2015–2018Publication Date (Print):April 1, 1995Publication History Publ…
Abstract The entitled compound was synthesized by using a step-growth polymerization technique and its molecular structure was determined by X-ray crystallography. This dendrimer showed a distinct UV absorption maximum at 264 nm and exhibited two very feeble fluorescence maxima at 320 nm and 400 nm.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled Synthesis of Bicyclic "Eight-Shaped" Poly(chloroethyl vinyl ether)sMichel Schappacher and Alain DeffieuxCite this: Macromolecules 1995, 28, 8, 2629–2636Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 19…
The formation of ${\mathrm{O}}_{2}$ by radiative association and by inverse predissociation of ground-state oxygen atoms is studied using quantum-mechanical methods. Cross sections, emission spectra, and rate coefficients are presented and compared with prior experimental and theoretical results. At temperatures below…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure and Magnetic Properties of a 2D Sheetlike .mu.-Cyanido- and .mu.-Oxamidato-Bridged Fe(III)-Cu(II) Bimetallic ComplexZhong Ning Chen, Jing Ling Wang, Jun Qiu, Fang Ming Miao, and Wen Xia TangCite this: Inorg. Chem. 1995, 34, 8, 2255–2257Publication Date (Pri…
The properties of a quasi-one-dimensional (quasi-1D) superconductor with an open Fermi surface are expected to be unusual in a magnetic field. On the one hand, the quasi-1D structure of the Fermi surface strongly favors the formation of a nonuniform state [Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) state] in the presence…
Changes in the surface structure of the single-crystal Si/SiO 2 /Si system during vacuum heating (950-1200° C) have been investigated using atomic force microscopy and scanning Auger electron microscopy. When the top Si layer is sufficiently thin, e.g. , below ∼30 nm for heating at 1100° C, holes are formed due to Si…