Materials Literature
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Orotidine-5′-phosphate pyrophosphorylase was isolated from wheat embryos and purified 35-fold. The enzyme is inhibited by high concentrations of orotate. Cu ++ and Mn ++ ions can replace the Mg ++ ion requirement. The enzyme shows a primary and secondary optimum at pH 8.5 and 9.8. Dihydro-orotate:NAD dehydrogenase als…
Abstract It is possible to draw analogies between linear polymers and cyclic compounds. Stereochemical considerations developed in this connection led to the recognition of new aspects of importance for the systematic classification of both classes of compounds; for example, asymmetric structures can be predicted whic…
Cotton print cloth (68 X 72) has been treated with aqueous solutions of dihydroxy ethyleneurea (DHEU) and several of its derivatives in the presence of inorganic catalysts at constant molar concentration of the metallic ion. The derivatives were N,N'-dimeth yloldihydroxyethyleneurea (DMDHEU), a dioxane complex of DMDH…
Abstract Polyclic compounds consisting of small rings have been known for several years. Their chemical and physical properties, which are of both theortical and practical interest, are discussed, and methods of preparation of a few examples are illustrated. The carbon skeletons of tetrahedrane, Dewar benzene, prisman…
It is shown that after brief neutron irradiation the elastic constants of polycrystalline reactor graphite are reasonably consistent with the single crystal values in a uniform stress (Reuss) approximation. A method is proposed for dealing with the anisotropy of the polycrystalline aggregate by reference to the coeffi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes of the Lanthanide Elements with α-Picolinate and α-Picolinate N-Oxide IonsH. Yoneda, G. R. Choppin, J. L. Bear, and A. J. GraffeoCite this: Inorg. Chem. 1965, 4, 2, 244–246Publication Date (Print):February 1, 1965Publication History Published online1 May 2002Publis…
Field measurements were recorded of water table, Eh, moisture, and temperature for three members of the Uplands catena throughout 2 years. Samples of the Orthic Podzol (Uplands), Gleyed Orthic Podzol (Rubicon), and Orthic Gleysol (St. Samuel) were analyzed.High Eh values (above 600 mv) and a water table below 4 ft pre…
The ${\mathrm{V}}^{51}$ NMR frequency shift ($\frac{\ensuremath{\Delta}\ensuremath{\nu}}{\ensuremath{\nu}}$) in metallic ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ has been measured in the temperature range of 175 to 575\ifmmode^\circ\else\textdegree\fi{}K the frequency shift at these two temperatures being -0.61% and +0.1%…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIMMERSIONAL WETTING OF SOLID SURFACESA. C. ZettlemoyerCite this: Ind. Eng. Chem. 1965, 57, 2, 26–36Publication Date (Print):February 1, 1965Publication History Published online1 May 2002Published inissue 1 February 1965https://pubs.acs.org/doi/10.1021/ie50662a005https://doi.…
The smooth, nearly Gaussian, optical absorption band of $F$ centers in most alkali halides contrasts with that observed at low temperatures in the cesium halides, where two or sometimes three components are partially resolved. A strong spin-orbit coupling could account for two components, but the third has remained a…
The emission spectra of the tris and tetrakis forms of four β-diketone chelates of europium were studied in the solid powder, and in alcohol solution with and without dimethylformamide added. Partial dissociation of the tetrakis form was observed in solution. Effective site symmetries, subject to steric distortion, we…
Electron spin resonance data for [VOCl5]3— and [MoOCl5]2— in dilute single crystals are reported and and analyzed to give the spin Hamiltonian parameters for these complexes. A molecular orbital formulation is given for the spin Hamiltonian parameters, and terms dependent on spin—orbit interactions near ligand nuclei…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferentilal Thermal Analysis and Reaction KineticsR. L. Reed, Leon Weber, and B. S. GottfriedCite this: Ind. Eng. Chem. Fundamen. 1965, 4, 1, 38–46Publication Date (Print):February 1, 1965Publication History Published online1 May 2002Published inissue 1 February 1965https:…
This paper reports experiments with KI to determine whether the near-uv emission characteristic of the "pure" crystal arises from the recombination of an electron with a ${V}_{K}$ center. KI crystals containing Tl or Eu, when irradiated at 77\ifmmode^\circ\else\textdegree\fi{}K with 1.7-MeV electrons, exhibit absorpti…
The quadrupole splitting of 57Fe Mössbauer spectra gives the magnitude, but not the sign, of the electric-field gradient. The sign can be determined by magnetically perturbing the energy levels, such that one line splits into a triplet and the other line splits into a doublet. A first-order perturbation treatment for…
Spiral etch pits are produced by etching natural graphite cleavage flakes in sodium peroxide. By etching matched cleavage faces, a correspondence has been found between the number, nature and position of the spiral etch pits on these faces. Similar correspondence has been found in the etch patterns produced on the two…
Abstract The crystallization kinetics of a sample of isotactic polystyrene have been measured at various temperatures. Despite the presence of secondary crystallization sufficient accuracy can be attained to enable an Avrami relationship with a constant integral value of n to be assigned to most of the rate curves. Th…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. H. Norman, H. Gene Staley, Wayne E. Bell; Mass‐Spectrometric Study of Gaseous Oxides of Iridiu…
Tetsuo Nozoe, Kahei Takase, Masao Tada; The Anionoid Substitution Reaction of Diethyl 6-Bromoazulene-1,3-dicarboxylate, Bulletin of the Chemical Society of
Abstract A number of commercial and experimental fluoropolymers were subjected to ionizing radiation at elevated temperatures and the changes in melt viscosity were measured as an indication of the degree of crosslinking or degradation which occurred. Polytetrafluoroethylene, polychlorotrifluoroethylene, polyhexafluor…