Materials Literature
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We measured the relative solubility of collagen in acetic acid after pepsin digestion and tentatively identified the types of collagen present in corneas of rabbits of various ages and in corneal scar tissue, using hydroxyproline assays and polyacrylamide gel electrophoretic analyses. More than 80% of the collagen in…
The response of and photoelectrodes to subband gap light has been explored as a function of numerous variables, including intensity and wavelength of light, applied potential, temperature, and electrolyte composition. The photoresponse is shown to be linear with light intensity, to depend on the square root of the app…
In the extremely sensitive polymethylated erbium complex (1) , the central erbium atom is surrounded by six monohapto ‐bonded methyl groups in a distorted octahedral configuration. The methyl groups are bridged pairwise by a lithium atom, which is co‐ordinated to the two nitrogen atoms of the N,N,N ′, N ′‐tetramethyle…
Research on the phosphorescent states of organic molecules has experienced a very active and rapid growth since World War II. The growth was undoubtedly initiated in 1944 by the identification of phosphorescence in organic molecules with the triplet state by Lewis and Kasha [1]. Since then, a great number of experimen…
Lattice parameters of LiCsSO4 have been measured in the temperature range 160–550 K with an X-ray single-crystal Bond diffractometer. The monoclinic angle γ in the low-temperature ferroelastic phase has been interpreted as an order parameter. Detailed results of X-ray studies of the ferroelastic domain structure suppo…
We show that the double minimum potential governing the proton motion in KDP, and its dependence on the oxygen-oxygen separation 2R, can be well represented by two back-to-back Morse functions. The overtone infrared absorption band at 4600 cm−1 observed by Viswanath and Miller is assigned as a |0> - |2> transition, an…
Abstract A new type of chiral solid mesophase was obtained by evaporating the solvents from solutions or jellies of chiral 12-hydroxyoctadecanoic acid (12HOA). The mesomorphic solids exhibited some optical properties characteristic of a helicoidal mesophase: (1) spherulitic or Schlieren texture under a polarizing micr…
The program for the synthesis of nonabsorbing thin film systems by the method of gradual evolution [J. A. Dobrowolski, Appl. Opt. 4, 937 (1965)] has been extended to include new features and to handle absorbing materials. In the analysis mode the new program calculates the spectral transmittance, reflectance, and abso…
The x-ray diffraction pattern of liquid ZnCl2 has been measured. The distances and coordination numbers derived from the data indicate that the Cl− ions are closed packed, and that the Zn2+ ions are located in the tetrahedral holes typical of such a structure.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[Rh10As(CO)22]3-. Example of encapsulation of arsenic by transition-metal carbonyl clusters as illustrated by the structural study of the benzyltriethylammonium saltJose L. VidalCite this: Inorg. Chem. 1981, 20, 1, 243–249Publication Date (Print):January 1, 1981Publication H…
Ruled gratings of 0.33–3.33-μm wavelength fabricated with SiO, SiO2, and In2O3-SnO2 are used to study the topographical effects of the surface on the twisted nematic (TN) alignments of liquid crystals (LC’s). The types of LC’s are Schiff base, azoxy, biphenyl, biphenyl ester, and phenyl cyclohexane. All of the LC’s, e…
Manganese(III) tetraphenylporphin MnIII(tpp)Cl catalyses the specific oxidation of olefins to ketones by O2 in the presence of [NBu4][BH4]; the latter reagent further reduces the ketones to the alcohols.
Nous examinons le comportement de solutions diluées de « bâtons durs », en présence de diverses perturbations extérieures : a) Près d'une paroi plane agissant de façon purement stérique (pas d'adsorption), la concentration en monomères est réduite sur une distance L (L, longueur des bâtons). Nous évaluons le profil de…
The properties and morphology of the cholesteric « blue » phase (BP) are discussed in terms of the « quasicrystalline » (QC) hypothesis, which states that the BP is ordered with three-dimensional translational periodicity. The lattice parameter of the « crystalline » BP is comparable to optical wavelengths, giving ris…
Liquid‐crystalline Heterocycloalkanes. I. Synthesis and Properties of Substituted 1,3‐Dioxanes The synthesis of 2,5‐disubstituted 1,3‐dioxanes is described, their melting and clearing points and their physical properties (dielectric anisotropy, viscosity, transition enthalpies, optical birefringence) are investigated.…
The optical absorption, emission, and excitation spectra for the Eu 5+ ion in the alkali halides have been investigated at room temperature. It was found that the magnitude of the 10Dq splitting of the 4f 6 5d configuration into its t 2g and e g components caused by the cubic crystalline field follows the spectrochemi…
Yeast enolase as prepared by current procedures is inherently chemically homogeneous, though deamidation and partial denaturation can produce electrophoretically distinct forms. A true isozyme of the enzyme exists but does not survive the purification procedure. The chemical sequence for both has been established. The…
Dielectric and light scattering spectroscopy are the most sensitive methods for the direct observation of low-frequency excitations in incommensurate phases. In several cases they have been successfully used for the observation of amplitudon and phason modqs. Whereas the amplitudon below the normal-incommensurate tran…
Measurements we have made of electric permittivities have revealed new pre-transitional effects in nematics with cyano end groups. These effects have been found to be related to the discontinuity in the mean permittivity at TNI observed for these nematics and they have been attributed to pre-transitional changes in th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of doping and degradation of polyacetylene by oxygenJ. M. Pochan, D. F. Pochan, H. Rommelmann, and H. W. GibsonCite this: Macromolecules 1981, 14, 1, 110–114Publication Date (Print):January 1, 1981Publication History Published online1 May 2002Published inissue 1 Jan…