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Abstract The magnetic susceptibilities of CuX2L (X: halide ion, L: 1,2,4-triazole, pyridazine, phthalazine, 4-amino-1,2,4-triazole) conform to the linear Ising model or Heisenberg model, indicating the presence of linear magnetic chains in the crystals. Fermi contact shift observed in the broad-line PMR spectrum indic…
The structure of ammonium hydrogen sulphate (AHS) has been determined in an (010) projection from X-ray diffraction data collected photographically at - 81°C. At this temperature AHS is in its ferroelectric phase. The asymmetric unit of the pseudo-orthorhombic unit cell (space group Ba) contains four formula units whi…
Abstract An aspartate racemase has been purified approximately 60-fold from the supernatant fraction of Streptococcus faecalis (ATCC 9790), a gram-positive organism whose peptidoglycan is cross-linked by d-isoasparagine residues. This partially purified preparation racemizes l-alanine about half as rapidly as it racem…
A synthetic compound SrTeO3 was discovered to exhibit ferroelectricity in the temperature range between 312 and 485°C. Small single crystals could be grown by the Kyropoulos method. The crystal belongs to the monoclinic system and its space group is C2/ c − C2 h6 at room temperature. A pronounced dielectric anomaly wa…
The temperature dependences of the magnetization and of the hyperfine field in ferromagnetic metals such as Fe or Ni are different even after transformation to constant volume. It is suggested that the effect of lattice vibrations can explain the observed explicit temperature dependence of the hyperfine field at const…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of the complex di-.mu.-hydroxo-bis[2-(2-ethylaminoethyl)pyridine]dicopper(II) perchlorateDavid Y. Jeter, David L. Lewis, Judith C. Hempel, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1972, 11, 8, 1958–1960Publication Date (Print):Augu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectrum of trinuclear chromium(III) acetateL. Dubicki and P. DayCite this: Inorg. Chem. 1972, 11, 8, 1868–1875Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972https://pubs.acs.org/doi/10.1021/ic50…
Abstract The formation of silver crystallites in silver-form zeolites was investigated, mainly by means of X-ray diffraction analysis. Silver ions were reduced to the zero-valent state; they aggregated to metals in three cases in this study—first, when silver-form zeolites were heated in a helium flow at above 600°C;…
The majority of theoretical work on the scattering of radiation from plasma is restricted to the low temperature regime where v/c<<1. Nevertheless it is common practice to apply the results of these theories to plasmas for which v/c/ approximately 0.05. (T e > approximately 600 eV). The theory of incoherent scattering…
The crazing behaviour of a grade of polystyrene which crazes profusely when tested in tension has been studied at 293°K using quantitative optical, electron and electron scanning microscopy. Tensile tests on this material showed that a high density of crazes was produced at room temperature. The crazes formed in a zon…
The kinetics of the initial‐stage sintering of a UO 2 powder in H, were investigated over the range 600° to 1200°C by dilatometry. Decreasing green density below #40% of theoretical leads to progressively reduced rates of sintering. Initiation of the effect is related to a critical value of the ratio of pore size to p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spectroscopy for chemical analysis (ESCA) studies on catalysts. Rhodium on charcoalJ. S. Brinen and A. MeleraCite this: J. Phys. Chem. 1972, 76, 18, 2525–2526Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 Aug…
The polarized laser-Raman scattering of oriented single crystals of β-AgI has been investigated at 300°, 80°, and 4.2°K. The fundamental optic lattice modes predicted by group theory were observed and assigned on the basis of scattering tensors. Further support for the present assignments of the β-AgI optic lattice mo…
In a copper crystallite containing many hundreds of atoms the static and dynamic behavior of point defects is simulated by means of an electronic computer. This follows the lines of an earlier work by Gibson et al. We have extended their investigation to collisions with subthreshold energies using a new computer progr…
The compound Bi2WO6 has been prepared as a ceramic and in single crystal form. Growth of Bi2WO6 single crystals from the melt by the Czochralski method produced boules as large as 20 mm in diameter by 60 mm long. On cooling to room temperature these boules invariably cracked, yielding for experimental investigations s…
Abstract On the example of transition metal hydrides, the role of interaction between interstitial atoms in the formation of ordered solid solutions and interstitial compound structures has been examined.
After revision, the molecular weight of the subunit of Escherichia coli K12 aspartokinase I‐homoserine dehydrogenase I is 86000 ± 4000 instead of 60000 as previously published. The enzyme is a tetramer, not an hexamer. The electrophoretic homogeneity of the subunits, the number of unique sequences around cysteinyl and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIndication of the magnitude of orientation factors in esterificationDan R. Storm and D. E. Koshland Jr.Cite this: J. Am. Chem. Soc. 1972, 94, 16, 5805–5814Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972http…
ADVERTISEMENT RETURN TO ISSUEPREVArticle1,3-Dioxolan-2-ylium and related heterocyclic cationsCharles U. Pittman, Samuel P. McManus, and John W. LarsenCite this: Chem. Rev. 1972, 72, 4, 357–438Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972https://doi…
The intensity ratio of the 004 to the 002 diffraction line, I(004)/I(002), was measured for graphitizing C atoms, non-graphitizing C atoms, carbon blacks and a neutron-irradiated carbon. The values of I(004)/I(002) are different for different C atoms even when they have the same interlayer spacing d002. For example, a…