Inhibitory Effects of Vitamin E on Collagen Synthesis and Wound Repair
From the Department of Surgery and Department of Biochemistry and Biophysics at the University of California, San Francisco, California 94122
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Recent improvements in the optical and electrooptic properties of plzt ceramics
Continuing studies on the improvement of the optical quality of lanthanum modified lead zirconate titanate (PLZT) ceramics have shown that (1) bulk residual porosity and (2) chemical inhomogeneity are primary factors contributing to optical losses in thick plates of the material. This paper describes methods by which…
Inelastic Electron-Proton Scattering at Large Momentum Transfers and the Inelastic Structure Functions of the Proton
Differential cross sections for electrons scattered inelastically from hydrogen have been measured at 18\ifmmode^\circ\else\textdegree\fi{}, 26\ifmmode^\circ\else\textdegree\fi{}, and 34\ifmmode^\circ\else\textdegree\fi{}. The range of incident energy was 4.5 to 18 GeV, and the range of four-momentum transfer squared…
Metal-Insulator Transition and Antiferromagnetism in a One-Dimensional Organic Solid
An experimental study of the organic charge-transfer salt $N$-methyl-phenazinium tetracyanoquinodimethan (NMP-TCNQ) is presented. Magnetic-susceptibility, specific-heat, spin-resonance, and conductivity measurements indicate a metallic state above 200 \ifmmode^\circ\else\textdegree\fi{}K with a continuous transition t…
Solubility of potassium halides in fused acetamide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility of potassium halides in fused acetamideRichard A. WallaceCite this: Inorg. Chem. 1972, 11, 2, 414–415Publication Date (Print):February 1, 1972Publication History Published online1 May 2002Published inissue 1 February 1972https://pubs.acs.org/doi/10.1021/ic50108a04…
X-ray diffraction measurements of the cation distributions in spinel structures
X-ray diffraction methods are applied to determine the cation distribution and the oxygen positional parameter in low-substituted magnetites with Al3+, Ga3+, or In3+ as substituents. It is possible to conclude that the tetrahedral site preference increases in the sequence Al3+, Fe3 +, In≃Ga3+, in good agreement with m…
Liquid-Crystalline Curvature Electricity: The Bending Mode of MBBA
Abstract Measurements are reported which show that the room-temperature nematic MBBA can be deformed by means of curvature electricity if it is contained in a thin sandwich cell with the electric field parallel and the unique axis normal to the bounding walls. Meyer's coefficient e 33 was determined to be 4 · 10 -5 dy…
Electrostatic cylinder lenses II: Three element einzel lenses
For Pt. I see ibid., vol. 4, 625 of 1971 The potential distribution inside three equidiameter coaxial cylinders separated by finite distances has been used to calculate the focal lengths, mid focal lengths and spherical aberration coefficients of some triple cylinder einzel lenses. The lenses considered have the lengt…
Crystal Growth and Properties of Boron Monoarsenide
Boron arsenide, a semiconductor with an energy gap of 1.46 eV, decomposes irreversibly at temperatures above 900 °C, thus limiting the temperature of the crystal growth process. In this work, single crystals of boron arsenide, identified by the x-ray diffraction method, have been prepared by the chemical transport of…
Laser‐raman study of crystallinity changes in poly(ethylene terephthalate)
Abstract The bandwidth at one‐half maximum intensity of the Raman‐active CO stretching vibration was found to correlate with density in poly(ethylene terephthalate). This correlation is valid for unoriented as well as highly oriented materials. It is suggested that a number of rotational states of the terephthalate s…
Electromechanical Properties of Oxygen-Octahedra Ferroelectric Crystals
A phenomenological theory of the electromechanical properties of various types of oxygen-octahedra ferroelectrics is presented. The electrostrictive constants reduced to those of the perovskite-type oxide are nearly constant with the values Q11p≈0.10 m4/C2, Q12p≈−0.034 m4/C2, and Q44p≈0.029 m4/C2. These constants are…
Mie scattering by optically active particles
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMie scattering by optically active particlesDavid J. GordonCite this: Biochemistry 1972, 11, 3, 413–420Publication Date (Print):February 1, 1972Publication History Published online1 May 2002Published inissue 1 February 1972https://pubs.acs.org/doi/10.1021/bi00753a018https://…
The Cholesteric Domain Texture
When a large pitch cholesteric is held between parallel glass plates a distance d apart, near the isotropic transition, a characteristic striped pattern appears. The distance between stripes is about the half pitch p oo/2 (providing d > p oo) and the texture has no measurable optical rotatory power. It does not appear…
Bound rubber in elastomers: Analysis of elastomer‐filler interaction and its effect on viscosity and modulus of composite systems
Abstract Bound rubber measurement may be very misleading as a measure of elastomer–carbon black interaction because sometimes only part of the apparently bound rubber is truly adsorbed on the carbon black surface. A theory is proposed which utilizes bound rubber measurements, but separates truly adsorbed rubber from o…
Macromolecule‐small molecule interactions; introduction of additional binding sites in polyethyleneimine by disulfide cross–linkages
Abstract Polyethyleneimine and its acyl derivatives have been thiolated with thiobutyrolactone and the SH groups introduced have been crosslinked in the presence of and in the absence of methyl orange, respectively. After crosslinking of the polymers, the bound methyl orange was removed. The resultant two kinds of cro…
Thermo‐optical and differential scanning calorimetric observations of mobility transitions in polystyrene‐poly(2,6‐dimethyl‐1,4‐phenylene oxide) blends
Abstract Transition temperatures by thermo‐optical analysis (TOA) and by DSC were measured on films of polystyrene (PS), poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO resin) and nine homogeneous blends of these polymers. The TOA procedure consists of automatically monitoring light transmission through birefringent scrat…
On the Measurement of Indices of Refraction of Nematic Liquids
We wish to report on a simple method for measuring the birefringence and indices of refraction of nematic liquids with an accuracy comparable with or superior to previously reported means.(1–3) The method is exemplified in measurement of the temperature dependences of the indices of refraction of p-methoxybenzylidene…
Conductivity Studies in Europium Oxide
The electrical and optical properties of EuO are studied in order to help determine conduction mechanisms. A strong relationship between growth parameters and electrical behavior is noted. Free-carrier absorption below the band edge in energy is observed in moderately conducting crystals. By comparing optical and elec…
Superconductivity and Magnetoresistance in NbSe2
Electron conduction in single crystals of Nb${\mathrm{Se}}_{2}$ has been measured at 4.2\ifmmode^\circ\else\textdegree\fi{}K in magnetic fields up to 150 kOe. The upper critical field ${H}_{c2}$ has been measured as a function of the angle between the applied field and the layers of the crystal for currents flowing bo…
Short Range Order Effects on EPR Frequencies in Heisenberg Linear Chain Antiferromagnets
The temperature dependence of paramagnetic resonance frequencies in a short range ordered spin state is studied theoretically and experimentally for two typical one-dimensional Heisenberg antiferromagnets, CsMnCl 3 2H 2 O and (CH 3 ) 4 NMnCl 3 . The present theory with the classical nearest-neighbor Heisenberg model p…