Materials Literature
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Abstract Vermiculites and smectites in soils and sediments are frequently partially interlayered or “chloritized”. Dioctahedral expansible layer silicates are those most frequently interlayered, and hydroxy-Al appears to be the principal component of the non-exchangeable interlayer material. The most favorable soil co…
An electrostatic lens system which compensates for chromatic aberration has been tested in an electron spectrometer. The results indicate that this lens is suitable for comparisons of peak intensities in electron-impact spectra. Relative intensities in vibrational progressions that belong to a single electronic transi…
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In a limited temperature range above the clearing point of crystal suspensions, submicroscopic entities representing unmeasurably small portions of the original crystal population may survive whose existence is revealed by crystals nucleated on subsequent cooling [1]. Factors influencing the number of these nuclei and…
For an arbitrary electron configuration l1n1l2n2l3n3⋯, analytical expressions are derived for the energy-matrix coefficients of the electrostatic-interaction parameters Fk(li,lj) and Gk(li,lj) and of the spin–orbit parameters ζ(li). A computer program is described which calculates decimal values of these coefficients…
Ferroelectric Ba0.27Sr0.75Nb2O5.78, with Tc = 348° ± 15°K, is a tungsten bronze-type structure crystallizing in the tetragonal system, with lattice constants a = 12.43024 ± 0.00002 and c = 3.91341 ± 0.00001 Å at 298°K, space group P4bm, and five formulas in the unit cell. The integrated intensities of 6781 structure f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegulation of glutamine synthetase. XII. Electron microscopy of the enzyme from Escherichia coliR. C. Valentine, B. M. Shapiro, and E. R. StadtmanCite this: Biochemistry 1968, 7, 6, 2143–2152Publication Date (Print):June 1, 1968Publication History Published online1 May 2002P…
Phosphorus, the element itself, becomes superconducting near 4.7 degrees K and at pressures exceeding 100 kilobars. This constitutes one of the four last missing links in the proof that superconductivity is normal behavior for every truly metallic sp element. The three remaining ones are arsenic, sulfur, and iodine.
The crystalline material covering the cocoon of Malacosoma neustria testacea (Lasiocampidae, Lepidoptera) was analyzed physically and chemically. The mean component was identified as calcium oxalate monohydrate, and the crystals were found to be whewellite in form.
Abstract Anionic polymerizations of methyl and other n ‐alkyl cinnamtes with organometallic catalysts were studied. Calcium‐zinc‐tetraethyl showed the greatest catalytic activity for the polymerization of the above monomers. In copolymerization of cis and trans isomers of methyl crotonate and isopropyl crotonate the t…
A recent microscopic elasticity formalism is generalized to nonprimitive, nonpiezoelectric crystals, and extended to treat long-range electrostatic interactions explicitly. Its relationship with the macroscopic theory of crystal elasticity is established for this type of crystal up to, and including, third order. The…
Neutron-diffraction studies on powered samples of BaLiH3 and BaLiD3 have shown that the structure is of the inverted perovskite type with the atomic positions of space group Pm3m: Ba in (0, 0, 0), Li in (12, 12, 12), and H or D in (12, 12, 0; 0, 12, 12; 12, 0, 12). The SrLiH3 and EuLiH3 are presumably isostructural. T…