Materials Literature
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Measurements of rotational viscosity in the various liquid crystalline phases of TBBA (terephthal-bisbutylaniline) are reported. The quantity measured is the viscous energy dissipation in the liquid crystal as it oscillates in a magnetic field. This dissipation varies greatly in the different smectic phases. It is sma…
Abstract Darstellung und Kristallaufbau für das kupferrote Rubidiumsuboxid Rb 9 O 2 werden beschrieben. Die Verbindung besteht aus Ionengruppen der gleichen Zusammensetzung, die metallisch aneinander gebunden sind. Durch Vergleich der Röntgendaten wird nachgewiesen, daß der Hauptanteil des mehrfach als „Rb 3 O”︁ besch…
The interaction of myosin subfragment-1 (S-1) with 4,4'-bis(1-anilinonaphthalene 8-sulfonate) (bis-ANS) has been studied by monitoring the fluorescence of the latter when the two components form a complex. Because ATP and ATP analogs partially displace complexed bis-ANS it has also been possible to study interactions…
The need for partial discharge (corona) measurements at very low frequencies is explained, and the results of tests on epoxy resin and polyethylene samples are given for the frequency range 0.1 Hz to 50 Hz. As no suitable commercial generator was available, a new type of low-frequency low-noise generator has been deve…
A molecular theory of cholesteric liquid crystals is presented. By means of symmetry considerations we obtain a general form of the intermolecular potential containing chiral contributions, which are then shown to be responsible for forming the cholesteric phase. The temperature dependence of the cholesteric pitch is…
The morphological aspects of biosynthesis of cellulose by Acetobacter xylinum and Acetobacter acetigenus were studied by transmission electron microscopy of both freeze-etch replicas and sections of cellulose-free cells in suspension culture before and subsequent to the induction of cellulose synthesis. Also examined…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence quenching of dicyanobis(2,2'-bipyridine)ruthenium(II) and dicyanobis(1,10-phenanthroline)ruthenium(II) by transition metal complexesJ. N. Demas, J. W. Addington, Steven H. Peterson, and E. W. HarrisCite this: J. Phys. Chem. 1977, 81, 11, 1039–1043Publication Dat…
The experimental results pertaining to the electronic structure of covalent amorphous semiconductors are briefly reviewed. It is found that three classes of materials exist, depending on the lowest-energy coordination of the predominant chemical component. In each case, the transport properties are ordinarily controll…
Magnetic measurements on the single crystal RGa intermetallic compounds (R=Pr, Nd, Sm, Tb, Dy, Ho and Er) have been carried out in the 4.2 K to 350 K temperature range. All the compounds, except ErGa, are ferromagnetism with high coercive force along the easy direction. ErGa compound is antiferromagnetism. The magneti…
Klebsiella pneumoniae ATCC 25955 (formerly named Aerobacter aerogenes PZH 572, Warsaw), which is known to produce coenzyme-B12-dependent glycerol dehydratase when grown anaerobically in a glycerol medium, formed coenzyme-B12-dependent diol dehydratase in a 1,2-propanediol-containing medium. Both the diol dehydratase a…
Abstract Aluminous hydroxy 2/1 clay minerals (‘intergrades’) can form in two ways: Al can either come externally from the solution, or internally from the mineral itself (octahedral or tetrahedral layers). This study is more concerned with the latter which seems the main source in acid soils. The most common organic a…
The results of an investigation of fluctuation-induced diamagnetism in superconducting layered compounds are presented. These results are used to establish the dimensionality of the superconducting fluctuation effects near ${T}_{c}$. Compounds studied include the intercalated compound $\mathrm{Ta}{\mathrm{S}}_{2}{(\ma…
Abstract Binary mixtures of a linear polyester (poly(ϵ‐caprolactone)) and a crystallizable monomer (trioxane) have been investigated by means of differential scanning calorimetry and optical and electron microscopy. The phase diagram indicates the existence of a eutectic at a temperature T mE = 314°K and for a polymer…
The temperature dependence of the mutual diffusion coefficient at zero solvent concentration for a number of polystyrene–solvent systems is satisfactorily represented by an equation derived from a new version of the free-volume theory of molecular transport. The free-volume parameter which governs the temperature depe…
Thermochemical data for gaseous UF5 and UF4 were obtained from equilibrium and electron impact measurements made by high temperature mass spectrometry. Equilibrium measurements yielded for the gaseous reaction Ag+UF5=AgF+UF4 the enthalpy change ΔH298=16.9±1.5 kcal by second law analysis. Additionally, the sublimation…
No abstract available.
Abstract α-Cyclodextrin (α-CDx) forms a 1 : 1 complex with p-nitrophenol (p-NP) and p-hydroxybenzoic acid (p-HB). The crystal structures were determined by the X-ray method. The crystals of both complexes are orthorhombic, and the space group is P212121 with Z=4. The cell dimensions are a=13.455(1), b=15.296(1), and c…
Abstract Laminated algal mats are well developed at Laguna Mormona, a closed hypersaline lagoonal complex on the west coast of Baja California, Mexico. These mats and underlying organic accumulations attain a maximum thickness of 30 cm. Their morphology is controlled mainly by the degree of desiccation: mound-shaped s…