Materials Literature
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Circular dichroic spectroscopy clearly reveals a solvent-induced conformational change of insulin in the presence of zinc ions. The spectral change corresponds to an increase in helix content. The transition observed in solution is an equivalent of the 2Zn----4Zn insulin transformation in the crystal. This is inferred…
Abstract (Zn, Mn)S mixed crystals with Mn concentrations up to 32 mol% and electron‐beam evaporated (Zn, Mn)S thin films are studied by photoluminescence emission, excitation, and decay measurements in the temperature range2 to 300 K. Besides the usual yellow an additional red emission band is observed with the same e…
Abstract The placement of ionic groups within the molecular structure of a polymer produces marked modification in physical properties. A large number of studies have been performed on these ion‐containing polymers, but few have focused on the effects of anion–cation interactions (i.e., counterion binding or ionizatio…
Streptomyces griseus synthesizes proline for osmoregulation under salt stress. Uptake of exogenous [14C]proline and internal synthesis of proline were quantified in cells growing at salt concentrations from 0 to 1 M NaCl. Externally supplied proline accounted for an increased proportion of the intracellular pool of fr…
The developments of the last decade are reviewed on a technical basis for heat-resistant alloys in application to the high-temperature structural components of the process heating high-temperature gas-cooled reactor. The major activities have fallen into two categories: the near-term development for the experimental r…
Abstract A series of uniaxially drawn films has been prepared from isotropic, amorphous poly(ethylene terephthalate) (PET) by using solid‐state coextrusion below its T g . To evaluating the crystallization behavior of the coextrudates, the cold‐crystallization temperature T c , Crystallization rate constant k , and ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe reaction of aromatic molecules in the interlayer of transition-metal ion-exchanged montmorillonite studied by resonance Raman spectroscopy. 1. Benzene and p-phenylenesY. Soma, M. Soma, and I. HaradaCite this: J. Phys. Chem. 1984, 88, 14, 3034–3038Publication Date (Print)…
Abstract Hard‐segment model compounds containing one to five 4,4′‐methylene bis( p ‐phenylisocyanate) (MDI) units extended with 1,4‐butanediol (BD) were synthesized. The ends of the model compounds were reacted with ethanol. The melting point ( T m ) of the model compounds increased with the number of MDI units to an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDepression of glass transition temperature in aramid-polybutadiene multiblock copolymersTakashi Inoue, Shinichi Ogata, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1984, 17, 7, 1417–1419Publication Date (Print):July 1, 1984Publication History Published online1…
When a metal is deformed cold, a small fraction of the energy expended in its deformation is stored in the crystal lattice associated with crystal defects and their elastic strain fields. There is evidence that grains having different orientations store different amounts of strain energy, although the data available a…
Abstract Highly oriented polyacetylene was synthesized using nematic liquid crystals as polymerization solvent
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic resonance studies of hydrogen-reduced rhodium/titanium dioxide catalystsJ. C. Conesa, P. Malet, G. Munuera, J. Sanz, and J. SoriaCite this: J. Phys. Chem. 1984, 88, 14, 2986–2992Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Publi…
Abstract Studies of the optical birefringence of solutions of acid‐soluble collagen from rat‐tail tendon at 22°C in the pH range 1.0–6.0 show that collagen exhibits an isotropic to mesophase transition only between pH 2.4 and 3.0 at 10% weight concentration. Such liquid crystalline order is probably essential for the…
A high contrast bright-field lattice imaging method in high resolution transmission electron microscopy and its application to the observation of microcrystalline domains in a partially decomposed amorphous Fe 84 B 16 alloy are described. A selection of an optimum defocus value was found to be necessary in obtaining d…
We report the results of a comprehensive x-ray-scattering study of multilayer ethylene physisorbed on graphite. At temperatures well below the triple point of bulk ethylene (103.8 K), adsorption only occurs up to a finite number of layers; any further addition of material results in the nucleation of bulk crystallites…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxations and molecular motions in homopolymers and copolymers of vinylidene fluoride and trifluoroethyleneT. Furukawa, M. Ohuchi, A. Chiba, and M. DateCite this: Macromolecules 1984, 17, 7, 1384–1390Publication Date (Print):July 1, 1984Publication History Publi…
A 7Be transport test was performed in the Beryllium-7 Experimental Lithium Loop with hot leg at 270°C and cold leg at 230°C. The “cold leg” test stringer was in a rising temperature region at 250°C. A total of 108 test coupons were included in the material compatibility and deposition test programs, containing AISI Ty…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of oxidation of methyl ethyl ketone and cyclohexanone by potassium bis(tellurato)cuprate(III)Ganesh Prasad Panigrahi and A. C. PathyCite this: Inorg. Chem. 1984, 23, 14, 2133–2138Publication Date (Print):July 1, 1984Publication History Published online…
The general theory developed by the authors for the light propagation in cholesteric liquid crystals has been applied to the analysis of the high resolution reflectance spectra measured in a monodomain sample, in various optical conditions and in a wide wavelength range by Takezoe et al. The dispersion relation for th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal degradation of sodium dodecyl sulfateJohn M. Patterson, Zbigniew Kortylewicz, and Walter T. Smith Jr.Cite this: J. Agric. Food Chem. 1984, 32, 4, 782–784Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissue 1 July 1984ht…