New strategy for the design of inclusion compounds:discovery of the ‘hexa-hosts’
A novel concept for the design of inclusion compounds, which has lead to the discovery of a series of hosts, is described.
Materials Literature
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Hot pressing of sodium lithium niobate ceramics with perovskite-type structures
Specimens of LixNa1-xNbO3 where 0.02 ≤ x ≤ 0.15 have been hot pressed to densities greater than 99% of the theoretical density and their dielectric and electromechanical properties measured as functions of density and composition. An enhancement of electromechanical properties has been observed for composition with x…
Poiseuille flow in nematics : experimental study of the instabilities
This work discusses experimentally the hydrodynamic instabilities of an oriented nematic film contained in a plane Poiseuille flow cell such that the director is initially perpendicular to the velocity and velocity gradient. Homogeneous instabilities having a uniform distortion in the plane of the boundary plates are…
Degradation of polyvinyl alcohol by microorganisms. II. Purification and some properties of polyvinyl alcohol-degrading enzyme produced by Pseudomonas O-3.
Purification was conducted on polyvinyl alcohol (PVA) degrading enzyme produced and secreted into the culture medium by Pseudomonas O-3 strain. The enzyme was found to separate into several fractions by ion-exchange chromatography and gel filtration. Among these fractions, a fraction adsorbed to SP-Sephadex C-50 at pH…
Moisture Diffusion in Fiber Reinforced Plastics
Fiber-reinforced epoxy laminates were exposed to several combinations of temperature and relative humidity. The purpose was to determine rates and extent of moisture absorption. Diffusion rates varied with temperature, and equilibrium moisture contents varied with relative humidity. Data analysis provided values for t…
The Crystal and Molecular Structure of 12, 13‐Dibromopseurotin
Abstract The crystal structure of 12,13‐dibromopseurotin has been determined by single crystal X‐ray analysis. The crystals belong to space group P2 1 with a = 16.75, b = 9.63, c = 7.42 Å, β 95.9°, Z = 2. The structure was solved by the heavy atom technique and refined to R = 0.062 with 819 significant reflexions for…
Spin-reorientation transitions in rare-earth magnets
Переходы спиновой переориентации в редкоземельных магнетиках, Белов К.П., Звездин А.К., Кадомцева А.М., Левитин Р.З.
Morphology and Viscoelastic Behavior of Styrene-Diene Block Copolymers in Pressure Sensitive Adhesives
Linear (SDS) and radial (SD)x block copolymers of styrene (S) and dienes (D=butadiene or isoprene), varying in composition and molecular weight, were formulated as pressure sensitive adhesives. The morphology of these compositions was determined by electron microscopy of ultra-thin sections and dynamic viscoelastic me…
Thermodynamic considerations in co-ordination. Part XXII. Sequestering ligands for improving the treatment of plumbism and cadmiumism
Potentiometrically determined formation constants are reported for cadmium(II), lead(II), and zinc(II) with ethylenediaminetetra-acetic acid, 1,2,di(2-aminoethoxy)ethanetetra-acetic acid, glutathione, cysteine, and D-penicillamine at 25 °C, I= 3.00M(NaClO4). Computer-simulated models of blood plasma conditions were us…
Theoretical predictions on the configurations of polymer chains in the amorphous state
Statistical mechanical models used to treat mixtures of random-coiling polymer chains with solvents invariably lead to a partition function that can be separated into a factor for the intramolecular configurations of the chains and another factor for mixing with solvent. It follows that the average configuration of a…
Improved delivery through biological membranes. 3. Delivery of N-methylpyridinium-2-carbaldoxime chloride through the blood-brain barrier in its dihydropyridine pro-drug form
Administration of N-methyl-1,6-dihydropyridine-2-carbaldoxime hydrochloride, the pro-drug form of 2-PAM, resulted in an average of 13-fold increase in the amount of 2-PAM delivered into the brain of mice as compared to the administration of 2-PAM. The pro-drug which crossed the BBB resulted in a dramatic increase in t…
Growth of polymer crystals during annealing
Observations by transmission electron microscopy are reported on the processes involved in polymer crystal growth during annealing. The observations suggest that crystal growth occurs by two processes. One process involves the melting of those regions of the crystals in which the melting point is lower than the anneal…
Nucleation characteristics of aqueous nickel ammonium sulphate solutions
The nucleation of nickel ammonium sulphate hexahydrate from aqueous solution has been studied by two different methods which involved measuring (a) the maximum allowable undercooling (the metastable zone width) and (b) the induction period before the onset of visible nucleation.Three different nucleation mechanisms we…
Raman scattering in ordered and disordered perovskite type crystals
Raman scattering from mixed ordered and disordered crystals with perovskite structure has been investigated. In the paraelectric phase of the ordered crystal first-order lines were observed with symmetry properties forbidden for an ideal perovskite structure. Also, Raman line in the high frequency region is attributed…
Relation between Drape Coefficients and Mechanical Properties of Fabrics
In this paper, drape coefficients and mechanical properties of 138 samples of woven fabrics are measured, and the relation between them is analyzed by means of residual-regression method. A linear equation by which the drape coefficient can be calculated from the mechanical properties is presented.As a result, it is s…
Selective preparation of cation-complexing cyclic oligoethers from ethylene oxide by a template effect
Ethylene oxide gives the cyclic tetra-, penta-, and hexa-mer with BF3 in the presence of fluoroborate, fluorophosphates, or fluoroantimonates of alkali metals, alkaline earths or transitions metal.
Rhombohedral distortion in highly magnetostrictive Laves phase compounds
A model is presented which produces a magnetostrictively driven rhombohedral distortion (λ111) in cubic diamond‐like structures. No tetragonal magnetostrictive distortion (λ100) is allowed, which is consistent with the experimental observation, λ111≫λ100. From x‐ray and single crystal measurements we find ‖λ111/λ100‖≳…
Secondary nucleation of two fast growth systems in a mixed suspension crystallizer: Magnesium sulfate and citric acid water systems
Abstract Secondary nucleation of magnesium sulfate and citric acid was studied in a seeded back mixed crystallizer. The MSMPR type of exponential population density distribution was obtained above 8 μm size in quasi steady state operation. Growth rates were satisfactorily correlated with supersaturation. Nucleation ra…
Nematic Liquid Crystals Containing Pyridine and Benzazole Rings
The liquid crystalline 6-alkoxynicotinic acids were prepared, and their transition temperatures measured. The isomeric 5-alkoxypicolinic acids are not mesomorphic. A series of 2, 6- and 2,5-disubstituted benzazoles were also synthesized. The effects of a molecule geometry, central linkages and a heteroatom on the meso…
Infrared spectroscopic characterization of the α-alumina surface
Several α-Al2O3 specimens were prepared by thermal treatment of pure transition aluminas, already in the form of i.r. pellets. When the starting material is a high external area phase, the resulting sample is still suitable for i.r. work. In particular two preparations are considered, which only differ in the number o…