Materials Literature
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A subcellular fraction enriched in twisted tubules was obtained by differential centrifugation of a homogenate of neurons isolated from areas of the brain with many neurofibrillary tangles from patients with Alzheimer's presenile-senile dementia. A unique protein (molecular weight 50,000 daltons) which does not co-mig…
Phase relations in the systems alkali monotungstate‐tungsten trioxide were investigated in the range 600° to 1100°C.In the Li system, compounds with an A 2 O/WO 3 ratio of 1:2 and 1:4 are stable and melt incongruently at 745° and 805°C, respectively. In the Na system, the 1:2 compound melts congruently at 746°C, where…
The visible absorption spectrum and magnetic circular dichroism (MCD) spectrum have been measured for Cs2NaEuCl6 at room temperature. The absorption spectrum and Zeeman splitting have been measured at liquid helium temperature as well. The Eu3+ is in a site of six-coordinate octahedral symmetry. Transitions from the 7…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGraft Copolymerization of 2-Methyl-2-oxazoline onto Chloromethylated Polystyrene and Hydrolysis of Graft Copolymer to a Chelating Resin of Poly(styrene-g-ethylenimine)Takeo Saegusa, Shiro Kobayashi, and Akira YamadaCite this: Macromolecules 1975, 8, 4, 390–396Publication Dat…
"The Theory of Polarization Phenomena." Optica Acta: International Journal of Optics, 22(7), p. 638
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual metalloporphyrins. XXIII. Unusual metalloporphyrin complexes of rhenium and technetiumM. Tsutsui, C. P. Hrung, D. Ostfeld, T. S. Srivastava, D. L. Cullen, and E. F. Meyer Jr.Cite this: J. Am. Chem. Soc. 1975, 97, 14, 3952–3965Publication Date (Print):July 1, 1975Publ…
Abstract Investigation of the clay mineralogy of forty-seven samples of sediments from boreholes in the western Nile Delta, an area little studied hitherto, and from surface sites on the mouth of the Nile and adjacent coast shows that the clay fractions consist of dominant iron-rich, dioctahedral, randomly interstrati…
The equilibrium shape of dissociated dislocations in thin foils of Cu-10 at.% Al is investigated by weak-beam electron microscopy. It is found that dislocations assume a truncated triangular shape caused principally by the reduction in line energy when Shockley partials rotate towards screw character. The effects of i…
An isolated acceptor impurity is shown to be responsible for the ∼113-meV deep luminescence band which is frequently seen in GaAs layers grown by molecular-beam epitaxy. We establish that this center, which is also observed in melt-grown and solution-grown GaAs and which has often been associated with the presence of…
Several electrochemical systems exhibit an intense color change when an electrochemical reaction is induced by an applied electrical field or current. The electrochemical and electro‐optical properties of several such systems have been investigated. These systems are termed electrochemichromic and they can be classifi…
Abstract The melting behavior of restrained isotactic polypropylene fibers is examined quantitatively in terms of the influence the anisotropic structural state of the polymer has on the observed properties. Two endotherm peaks are observed to occur in some of the samples. The formation and location of the multiple pe…
The effects of fabrication variables on the high‐temperature strength of hot‐pressed Si 3 N 4 containing 5 wt% Y 2 O 3 were studied. Materials containing a crystalline grain‐boundary phase, formed as a consequence of a high‐temperature presintering heat treatment and identified as Si 3 N 4 ·Y 2 O 3 , had high‐temperat…
Abstract The multiple melting transitions previously reported for cis ‐polyisoprene have been related to different morphological species observed in thin films using transmission electron microscopy. Two distinct types of spherulitic lamellar crystal have been identified which have characteristic growth rates, lamella…
In this paper a general spectral approximation theory is developed for compact operators on a Banach space. Results are obtained on the approximation of eigenvalues and generalized eigenvectors. These results are applied in a variety of situations.
The quantum efficiency of Dy 3+ ‐activated phosphors is reasonably high in lattices where a low activator concentration (≤ 1%) is already sufficient for effective energy transfer from the lattice to the activator ions. When more activator is needed for effective energy transfer, the quantum efficiency is limited due t…
Aspects of the behavior of the twist elastic modulus K22 of a lyotropic liquid crystal formed by the α-helical polypeptide poly-γ-benzyl-L-glutamate of three molecular weights (MW= 300 000, 310 000, and 550 000) in three solvents (dioxane, dichloromethane, and chloroform) were investigated as a function of concentrati…
The analysis of diffusional transport limitation of nutrient uptake rates by phytoplankton, derived earlier for spherical cells, is extended to include, in an approximate manner, cylindrical and disk‐shaped cells. Transport limitation of nutrient (NO 3 − and NO 2 − ) uptake rates by the marine diatom, Ditylum brightwe…
Characteristic electron-energy-loss processes in crystalline silicon foils are examined for scattering angles less than 2.5 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}4}$ rad. The relatively high energy of the electron beam (75 keV), combined with a low angular divergence (8 \ifmmode\times\else\texttimes\…
Structural changes accompanying extreme boron-enrichment of boron carbide were deduced with Mo K0¢ X-ray diffraction data obtained from a twinned aggregate containing a minimal amount of carbon. The crystal system remains rhombohedral, probable space group R-3m, as for B4C, but unit-cell parameters show significant ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of molecular complexing on the properties of binary nematic liquid crystal mixturesJ. W. Park, C. S. Bak, and M. M. LabesCite this: J. Am. Chem. Soc. 1975, 97, 15, 4398–4400Publication Date (Print):July 1, 1975Publication History Published online1 May 2002Published i…