Materials Literature
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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…
NADP(+)-isocitrate dehydrogenase (NADP(+)-IDH) from the dinitrogen-fixing filamentous cyanobacterium Anabaena sp. strain PCC 7120 was purified to homogeneity. The native enzyme is composed of two identical subunits (M(r), 57,000) and cross-reacts with antibodies obtained against the previously purified NADP(+)-IDH fro…
Weaire and Phelan's recent discovery of a clathrate structure (that of β-tungsten) as an ordered minimal froth (space-filling assembly of polyhedral bubbles) with less surface per unit volume than Kelvin's b.c.c. arrangement of truncated octahedra suggests searching among other known tetrahedrally close-packed crystal…
The dynamics of spreading of miroscopic nonvolatile polymer droplets on surfaces has been studied by the molecular-dynamics method. Simulations have been performed for mixtures of solvent and dimer, solvent and tetramer, and solvent and octamer droplets. For solvent particles and dimers, the dynamical layering is char…
Abstract A review is given on comparative investigations onto the structure of regenerated cellulose fibers of the regular viscose type (modal) and of solvent spun fibers of the lyocell type, namely the NMMO fiber spun from a solution of cellulose in N–methylmorpholine N–oxide and water. It was found that in the lyoce…
Abstract Degradation of polyvinylchloride has been reexamined in the light of its DT‐DSC‐TG analytical behavior up to a temperature of 1000°C in an inert atmosphere. Four distinct stages of degradation have been identified. The first stage is almost eventless with no change in weight for untreated PVC samples. The sec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and Chemical Investigations of Na3(ABO4)3.cntdot.4H2O-Type Sodalite PhasesTina M. Nenoff, William T. A. Harrison, Thurman E. Gier, Nancy L. Keder, Charlotte M. Zaremba, Vojislav I. Srdanov, Jaqueline M. Nicol, and Galen D. StuckyCite this: Inorg. Chem. 1994, 33, 1…
Abstract Fourier transform (FT) Raman spectroscopy has been proved to be an adequate technique for the study of the quantitative structural changes which take place in poly(ethylene terephthalate) on annealing. The two‐phase conformational model proposed previously in the infrared domain using photoacoustic FTIR has b…