Materials Literature
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Schafarzikite, FeSbrOo, is tetragonal, space group P4.z/mbc, with c : 8.59, c : 5.91A. The crystal structure is characterized by the presence of edge-sharing iron octahedra connected with corner-sharing antimony ry'-tetrahedra (Fischer and Pertlik, 1975). Versiliaite is orthorhombic, space group Pbam, a : 8.492, b : 8…
By acidification of an aqueous solution of Rb 2 MoO 4 with sulfuric acid the rubidium trimolybdatosulfate Rb 2 SMo 3 O 13 · 0.72 H 2 O is formed. A compound with the same composition and evidently the same structure but free of crystal water is obtainable by melting a mixture of Rb 2 SO 4 and MoO 3 in molar ratios 1:3…
KEYWORDS: fusion reactordeuteriumtritiumisotope separationseparation factorspalladium membranepermeabilityhydrogengas mixture
The photoemission characteristic of high-density polyethylene is found to change after the polymer is electrified by contact with metals. In contact with Cr (work function=4.35 eV), the emission yield after contact ( y a ) is smaller than that before contact ( y b ) at h ν<4.9 eV. On the other hand, at h ν>4.9 eV, y a…
The chemical interaction between biaxially-oriented polypropylene film and diarylalkane has been investigated by studying the dielectric properties of the polypropylene film impregnated by the fluid. It was found that the ß dispersion in its dissipation factor-temperature relationship is related to the segmental motio…
A group of 20 middle-class women between 20 and 40 yr. of age and in the third trimester of pregnancy was compared with a control group of 20 non-pregnant women for cutaneous sensitivity (to a tickle) and for modifications of body schema which were hypothesized to occur during pregnancy. Latency and actual duration we…
Comparative analysis of the high-field 1H N.M.R. spectrum followed by selective 1H decoupling experiments provides complete assignment for the 12 carbon-13 resonances observed in sucrose, especially C2, C5, C4' and C5'.
The primary reactions of the neutral and protonated riboflavin triplet states with phenylacetic acid, indole-acetic acid and several similar derivatives have been examined by laser flash photolysis. The results indicate that one-electron transfer to the flavin triplet state(s) is the major reaction of all the substrat…
X-ray photoelectron spectroscopy (XPS) was employed to identify radiolytic products in NaClO3, LiClO3, LiBrO3, and LiIO4 which were irradiated in situ with 1.4 keV electrons. While LiIO4 was exceedingly resistant to radiation damage, the remaining compounds decomposed readily by an apparent stepwise release of oxygen…
Using thermal analysis it is possible to determine solidification rate by measuring the amount of heat emitted by a sample. Different methods of calculating the heat lost under various conditions are discussed. Using solidification rates thus determined, the solidification cycle and solidification kinetics are analyse…
Rings having 10 delocalizable electrons are of interest as potentially aromatic compounds. The unsubstituted 1,4-dihydro-1,4-diazocine (1) has now been prepared by two independent syntheses. Some N,N′-disubstituted derivatives of this ring system were already known. On the basis of its chemical behavior, spectra, and…
The Brillouin and Rayleigh scattering spectra have been observed near the transition temperature T c in the paraelectric phase of KD 2 PO 4 as a function of the direction of the scattering vector q in several scattering geometries. The broad central component ascribed to dynamical spectrum of the Debye type relaxation…
Abstract Cation-exchange equilibrium for Ca-K-montmorillonite was studied at 35°, 50°, and 90°C and at three total normalities of the equilibrium solution (0.1, 0.05, and 0.01 N). Changes of the standard free energy for the exchange from K-montmorillonite to Ca-montmorillonite were determined to be −53, −270, and −393…
The binding of the various substrates to Escherichia coli glutamyl-tRNA synthetase has been investigated by using as experimental approaches the binding study under equilibrium conditions and the substrate-induced protection of the enzyme against its thermal inactivation. The results show that ATP and tRNAGlu bind to…
The microscopic dynamic behavior of some simple liquids has been investigated by observing the time evolution of the separation between members of pairs of atoms. The distribution function for this process was calculated in molecular-dynamics studies of several states of two model fluids: Lennard-Jones and simulated r…
Evidence for reductive carboxylation of succinate to synthesize alpha-ketoglutarate was sought in anaerobic heterotrophs from the rumen and from other anaerobic habitats. Cultures were grown in media containing unlabeled energy substrates plus [14C]succinate, and synthesis of cellular glutamate with a much higher spec…
Topical interest in photochromic systems is due in part to their application in silver-free photography, in data display technology, and possibly even in solar energy storage. The new system (1)⇌(2) is readily accessible and open to wide structural variation.
In Cyelotella meneghiniana the location of the nucleus in the vegetative cell changes as the cell diameter is decreased by successive cell divisions. Other features of the vegetative cell are ultrastructurally similar to other diatoms: chloroplasts are enveloped by chloroplast endoplasmic reticulum; pyrenoids are trav…
Abstract Infrared and Raman spectra (10–4000 cm −1 ) of single crystals and of polycrstalline samples of (NH 3 (CH 2 ) 3 NH 3 )MnCl 4 and of its ND 3 deuterated derivative have been investigated in the 10–400 K temperature range. An assignment of most of the observed bands is proposed. The first‐order phase transition…
Samples from the Antarctic and Subantarctic Zones were used for a study of three taxa of the diatom genus Thalassiosira with circumpolar distribution. Most records were from south of the Antarctic Polar Front Zone. T. perpusilla, T. gracilis var. gracilis, T. gracilis var. expecta, stat. nov., have the longer extensio…