Materials Literature
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Abstract In soils low in organic matter but high in clay mineral content, the fixation and release of NH 4 by soil clay may have a significant impact on available N, in addition to the organic N. The objective of this work was to evaluate the contribution that nonexchangeable NH 4 , newly fixed by clay minerals, may h…
Effective conjugation coordinate (ECC) theory has previously been used to interpret the Raman spectra of oligopyrroles and polypyrrole, providing information on conjugation and delocalization. However, the materials used in real applications have long alkaline side chains (to aid solubility), which leads to conformati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR and Electronic Spectra of (3-chloroanilinium)8[CuCl6]Cl4: Evidence for Tetragonally Elongated CuCl64- Ions with the Long Axis Disordered in 2-DimensionsHorst Stratemeier, Burghard Wagner, Elmars R. Krausz, Rolf Linder, Hans Herbert Schmidtke, Juergen Pebler, William E. H…
Abstract An electrochemical cell, Pd | YSZ | Pd, was constructed to remove both NO and CH4 from an oxidizing atmosphere. When the direct current was supplied to the cell at 700 °C in the reactant flow containing 1000 ppm NO, 1000 ppm CH4 and an excess amount of O2, NO was reduced to N2 at the cathode, and CH4 was oxid…
The distribution of keratan sulphate (KS) in normal endometrium has been studied by immunohistochemistry using monoclonal antibody 5D4. KS is present in association with glandular epithelium throughout the normal cycle. Production is hormonally regulated, as indicated by the significant increase observed in the secret…
Abstract The effectiveness of predicting rubber performance based on measured silica physical properties in silica- and carbon black-filled compounds is presented for three rubber formulations: an off-the-road tire tread, a wire coat stock and a V-belt. Correlation and regression analyses were performed using SAS soft…
An acid phosphatase containing a 27-kDa polypeptide component has been identified in Escherichia coli by means of a zymogram technique. The enzyme is secreted in the periplasmic space and is able to hydrolyze several organic phosphate esters, but not diesters, showing preferential activity on p-nitrophenyl phosphate a…
In A2BX4 structures which are isostructural to β-K2SO4 (with A being a monoatomic cation) there are two crystallographically independent cations surrounded by 11 and 9 X-atoms. The 11-coordinated cation is less firmly bound and the arrangement of its five closest neighbours is irregular. One of these contacts is appro…
Abstract A direct optimization method to estimate nucleation and crystal growth rate parameters from seeded batch cooling crystallization experiments is evaluated. The experimental information applied comprises the concentration of the solution and the temperature as functions of time and the final product size distri…
The viscosity of a monolayer of a suspension of bimodally distributed hard spheres is determined for area fractions, φa, from 0.15 to 0.74 with different particle size ratios, λ (diameter of large sphere/diameter of small spheres=1, 2, and 4), and different fractions of small spheres of total solids, ξ (0.07, 0.27, 0.…
The effects of softened fabrics on the skin were evaluated by a forearm wet and dry test, under conditions simulating real-life skin contact with fabrics. 15 volunteers with sensitive skin according to dermatological assessment and their own recognition entered a double-blind 12 day, 3 sessions per day, forearm wettin…
Yeast (Saccharomyces cerevisiae) acetyl coenzyme A (CoA) synthetase (EC 6.2.1.1) catalyzes the synthesis of adenosine 5'-tetraphosphate (P4A) and adenosine 5'-pentaphosphate (p5A) from ATP and tri- or tetrapolyphosphate (P3 or P4), with relative velocities of 7:1, respectively. Of 12 nucleotides tested as potential do…
When the 5F5 levels of Ho3+ in LaF3 were resonantly excited with a red dye laser beam of 640 nm, blue and green emissions were detected from the 5G5, the 5F3, and the 5S2(5F4) levels at 416, 485, and 546 nm, respectively. We found that excited ions in the 5F5 state undergo nonradiative relaxation to the 5I6 state and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Crystal Structure, and Magnetic Properties of a Ferromagnetically Coupled Angular Trinuclear Copper(II) Complex [Cu3(O2CMe)4(bpy)3(H2O)](PF6)2Shanmugam Meenakumari, Satish K. Tiwary, and Akhil R. ChakravartyCite this: Inorg. Chem. 1994, 33, 10, 2085–2089Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Chain and Oligomeric Condensed Cluster Phases for Gadolinium Iodides with Manganese InterstitialsMasahiro Ebihara, James D. Martin, and John D. CorbettCite this: Inorg. Chem. 1994, 33, 10, 2079–2084Publication Date (Print):May 1, 1994Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA2Zn3As2O2 (A = Ba, Sr): A Rare Example of Square Planar ZincStephanie L. Brock and Susan M. KauzlarichCite this: Inorg. Chem. 1994, 33, 11, 2491–2492Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.ac…
Bright-field image contrast of thermotropic cholesteric liquid crystalline materials in the transmission electron microscope (TEM) is investigated. Possible sources of contrast for these systems are discussed in terms of their molecular anisotropy. A cholesteric side-chain liquid crystalline compound was investigated…
We analyze the linear stability of a planar solidification front with sharp-interface and phase-field models in two physical situations: (1) an isothermal system at the melting point in the unperturbed state, and (2) constant-speed growth of a crystal into its hypercooled melt. The parameters in the phase-field models…
The temperature dependence of the local distortions in ${\mathrm{SrTiO}}_{3}$ has been studied by EXAFS spectroscopy at the titanium K edge (4982 eV). The oxygen-ion Debye-Waller factor ${\mathrm{\ensuremath{\sigma}}}_{0}^{2}$ has been determined from 4.5 to 240 K. The antiferrodistortive transition at 105 K is eviden…
We report the 470-MHz (11.7 T) 19F solution nuclear magnetic resonance (NMR) spectra of 2-, 3-, and 4-fluorophenylalanine incorporated into the egg white lysozymes (EC 3.2.1.17) of chicken, pheasant, and duck, as well as spectra of 4-fluorotryptophan incorporated into chicken, California valley quail, and Bob White qu…