Materials Literature
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The Structure of a new bis-cyclotribenzyl cavitand, (2), forming an internal 1 : 1 Complex (‘cavitate’) with dichloromethane, has been determined by single X-ray crystallography.
Abstract A number of polysaccharides of the starch type, including maltodextrins and cyclodextrins and some other well‐known polysaccharides have been oxidized by periodate/chlorite (two‐step method) or hypochlorite (one‐step method), yielding ring‐opened polycarboxylates. The oxidation products from the starch type s…
Substitution of tetraphenylporphyrinatomanganese(III) complexes on the peripheral phenyl groups makes these compounds suitable as catalysts for the epoxidation of terminal olefins with mono-oxygen donors such as sodium or lithium hypochlorite and potassium hydrogen peroxomonosulphate in a biphasic system.
Single-crystal e.s.r. spectra of u.v.-irradiated octakis(methylammonium) decamolybdate(VI) dihydrate, [NH3Me]8[Mo8O26(MoO4)2]·2H2O, show the formation of two distinct localized MoVO5(OH) sites, resulting from a hydrogen-bonding proton transfer from [NH3Me]+ to a bridging oxygen atom in the anion. Analysis of the e.s.r…
Dans cet article sont donnes 150 parametres de solubilite de matieres cosmetiques ainsi que les methodes pour leur calcul et un programme d'ordinateur
Résumé. 2014 Les variations en fonction de la température des invariants du paramètre d’ordre sont mesurées dans les phases nématiques uniaxes et biaxes de différents mélanges de laurate de potassium, 1-decanol, D2O. Elles montrent que les transitions de phase nématique uniaxe-biaxe sont du second ordre et de champ mo…
The relationship between low-molar-mass or monomeric liquid crystals and polymeric liquid crystals is explored by examining the historical development of experimental and theoretical aspects of the latter materials. Polymeric liquid crystals are initially contrasted with conventional, non-mesogenic, flexible polymer c…
Aqueuous solutions of copper(I) iodide, potassium iodide, and the crown ether from unexpectedly different and novel structure: [Cu4I6][Cu8I13]K7(12-crown-4)6 with two different clusters per asymmetric, unit and polymeric modifications, [Cu4I6]K2(15-crown-5)2, and [Cu3I4]K(dibenzo-24-crown-8) depending upon identity of…
Hydrogen attack (HA) is a degradation process occurring in steel exposed to hot, high-pressure hydrogen. It is caused by the nucleation, growth, and ultimate link-up into fissures of small methane bubbles – primarily on grain boundaries. The location and growth kinetics of the submicrometre bubbles during the incubati…
Abstract In Abhängigkeit von der durch Natronlaugenbehandlung hervorgerufenen Gitterumwandlung werden Veränderungen der übermolekularen Struktur von Linters‐Cellulose durch geeignete Parameter (Kristallinitätsgrad, Ordnung und Größe der kristallinen Bereiche) charakterisiert. Die Anwendung des Verfahrens nach Ruland‐V…
I.r. bands due to dissociative adsorption of hydrogen onto ZrO2 at room temperature were observed by Fourier transform i.r. spectroscopy at 3780 and 3668 cm–1 for ZrOH and at 1562 and 1371 cm–1 for ZrH and ZrHZr, respectively.
Sericin gene expression in the middle silk glands during Bombyx mori larval development was analyzed using probes from a genomic DNA clone for 10.5 kb sericin mRNA. The 10.5 kb mRNA, the most abundant in the fifth instar, is not detected in the third feeding, fourth feeding and fourth moulting stages. It becomes detec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxo anion-supported organoactinides: the [(C5H5)3U(MW5O19)2]5- anions (M = Nb, Ta) and their thorium analogs [(C5H5)3Th(MW5O19)2]5-V. W. Day, W. G. Klemperer, and D. J. MaltbieCite this: Organometallics 1985, 4, 1, 104–111Publication Date (Print):January 1, 1985Publicati…
Based on experimental observations, a theoretical framework has been established to quantify the geometry of a three-dimensional braided fabric. Predictions of the strength of the fabric and composite were made using a geometric model.
The effect of hydrostatic pressure on the corrosion of aluminium in sea water oj pH 8·2 containing 7ppm dissolved oxygen has been investigated at 20°C. On increasing the pressure from 1 to 300 atm, the corrosion rate increased, an effect attributable to an increase in the rate of the anodic reaction while the cathodic…
Abstract It is observed that neither inspection of z values, consideration of near-neighbour coordination, nor chemical considerations show in all cases which atom occupies site 2 ( c I ) and which site 2 ( c II ) of the Cu 2 Sb tP 6 structure. Calculation of the Wirkungsbereiche by the Dirichlet construction shows in…
In this brief history, the author reviews the observations that led to his developing a nonionic contrast medium. Current knowledge suggested that if a water-soluble medium could be made isotonic to human plasma, it would cause less pain and toxicity than the ionic media then in use. The principles and design of such…
A recent study by Gross et al. showed the possibility of positive charging of dielectric materials by low energy electron irradiation. In this paper we model the charging process allowing us to predict the voltage builtup or decay and the corresponding charging currents under various initial potential conditions of th…
The xylose isomerase gene from Bacillus subtilis was cloned from a genomic BamH1 library by complementation of an isomerase defective Escherichia coli strain as previously described. The ATG initiation codon is preceded by a Shine-Dalgarno sequence and two hexamers being characteristic for the promoter region of Bacil…
The crystal structure of a small calcium-binding protein, the parvalbumin IIIf from Opsanus tau in which Tb was substituted for Ca, has been analysed by multiwavelength anomalous diffraction. Data at a resolution of 2.3 A were collected at three wavelengths near the L3 absorption edge of Tb (1.645-1.650 A), using the…