Materials Literature
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Two spectroscopically distinct types of tyrosine (Tyr) residues in triply point mutated bacteriophage T4 lysozyme, which contains no tryptophan (Trp), have been detected by optical detection of triplet-state magnetic resonance (ODMR) spectroscopy. Their triplet states are characterized by similar E but different D val…
The effects of isoelectronic doping of GaAs by In or Sb on the electron deep levels in n-GaAs grown by molecular-beam epitaxy have been investigated in the growth temperature range 500–600 °C for Si doping levels of 4–7×1016 cm−3 and As-stabilized conditions. The two dominant traps M3 and M6 are drastically reduced in…
The periplasmic nonspecific acid phosphatase II from Salmonella typhimurium was purified to homogeneity from a mutant strain that overproduces the enzyme (Uerkvitz, W., and Beck, C.F. (1981) J. Biol. Chem. 256, 382-389). It was shown that the enzyme transfers phosphate groups from organic phosphoric acid esters (donor…
An expression plasmid containing a hybrid gene encoding a protein having the primary amino acid sequence of the adenylate cyclase from Escherichia coli was constructed. When the gene was induced, the adenylate cyclase could be expressed at high levels in a cya- strain of E. coli. The majority of the enzymatic activity…
As a part of a study to develop a stainless steel (SS) with superior resistance to intergranular stress corrosion cracking (IGSCC), intergranular corrosion (IGC), and pitting corrosion, an investigation was initiated to identify possible ways to improve the properties of an 18Cr-8Ni SS. This paper discusses the influe…
The composition of NOx generated in the dissolution of UO2 has been described in different ways by earlier authors. Finding a way to determine the NOx composition in the dissolution included experiments concerning the reactions of NO and NO2 with 3 to 6 M HNO3. The following conclusions have been obtained for the diss…
A colloidal dispersion consisting of optically matched host particles and a small amount of strongly scattering tracer particles has been studied with dynamic light scattering. Analysis of the self-dynamic structure factor ${F}_{s}$(q,t) obtained from these measurements demonstrates that the displacement statistics of…
Abstract It is shown how the morphology and the bulk physico‐mechanical properties of polymer blends and alloys may be tailored, by using proper physical and processing conditions for homogeneous systems, and molecular engineering of the interfaces for heterophase ones. That approach, which has been substantiated by a…
Abstract Electron probe micro‐analysis is applied to the determination of thin films (20–200 nm) deposited on a known substrate. Bulk standards are used for calibration and data reduction is based on the computation of Φ( pz ) depth distribution functions. The Φ( pz ) model of Pouchou and Pichoir and the Gaussian Φ( p…
Multiple resonance frequency spectra (MRFS) provide a rapid and repeatable method for determining the flexural stiffness and modulus of elasticity, E, of segments of plant stems and leaves. Each resonance frequency in a spectrum can be used to compute E, and removal of the distal portion of an organ produces character…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibria and dissociation kinetics of lanthanide complexes of diaza crown ether carboxylic acidsC. Allen Chang, Peter H. L. Chang, V. K. Manchanda, and S. P. KasprzykCite this: Inorg. Chem. 1988, 27, 21, 3786–3789Publication Date (Print):October 1, 1988Publication History…
Abstract The concept of thermally reversible crosslinking was investigated by using poly[bis(trifluoroethoxy)phosphazenes] with different percentages of cyclopentadienylethoxy and dicyclopentadienyldiethoxy substituent groups. The resultant structures of these polymers are discussed and the phenomenon of reversible cr…
Silicone rubber has great advantages as a contact lens material because of its very high oxygen permeability, softness, and excellent mechanical strength and durability. Practical application is hampered by inherent characteristics of elastomers, i.e., high tackiness and highly hydrophobic surface properties. By apply…
Abstract The rate of dissolution of akaganéite in HCl increased with time over the bulk of the reaction leading to a sigmoid dissolution vs. time curve. The bulk of the dissolution of lepidocrocite could be described by the cube root law. Transmission electron microscopy examination of partly dissolved crystals of aka…
Article Structural and magnetic properties of the clinopyroxenes NaFeSi2O6 and LiFeSi2O6 was published on October 1, 1988 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 183, issue 1-4).
The so-called group index of refraction may be measured by observing the shift of the visibility envelope when a sample is inserted into one arm of a Twyman–Green interferometer. Although the group and phase index curves are related, the phase index cannot be directly calculated from the group index because there are…
The relationship of TL response and glow curve structure of LiF(Mg,Cu,P) to the concentration of dopants has been investigated systematically. The experimental results have shown that the relative height and light integration of the main glow peak depend strongly upon the technique of preparing the TL material and the…
A Monte Carlo calculation of diffuse scattered intensity of p-polarized light from a randomly rough Ag grating shows enhancement in the backward direction, as predicted in perturbation theory by the selective summation of maximally crossed diagrams for the resonantly excited surface polaritons.
The series of the title compounds were prepared by solid-state reactions. The phase transitions between room temperature and 1450 °C were investigated by DTA and X-ray diffraction. All compounds undergo at least one reversible phase transition in the solid state. The Rb containing compounds, with the exception of thos…
Abstract Amplified optical image storage has been demonstrated in polymer liquid crystals (PLC). A small amount (< 5 mol%) of a low molecular weight mesogen with a photoresponsive moiety, 4-butyl-4′-methoxyazobenzene (BMAB), was doped in the films of polyacrylates with mesogenic side chain, poly(4′-methoxypheny…