Materials Literature
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Pyrocatechasewas purified from extracts of benzoateinduced cells of Pseudomonas arvilta.The most purified preparation had a specific activity of 29.6, about 50% higher than that previously reported, and was homogeneous as judged by ultracentrifugation and by electrophoresis.The molecular weight was estimated to be app…
An experimental technique has been developed for the absolute measurement of the density of a surface charge on a dielectric. The apparatus is described and includes provision for producing the surface charges by electron and ultra-violet irradiation, and by the contact of metal electrodes of known differences in work…
Abstract On décrit le formalisme de la méthode LCAO SCF CO permettant d'étudier les propriétés des systèmes périodiques conjugés et un procédé semi‐empirique pour évaluer les intégrales intervenant dans les éléments de matrice de l'operateur du champ autocohérent de ces systèmes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of Friction in Oil Pipelines by Polymer AdditivesArie Ram, Ehud Finkelstein, and Chaim ElataCite this: Ind. Eng. Chem. Process Des. Dev. 1967, 6, 3, 309–313Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Published inissue 1 July 1…
Abstract The degree to which HAF black restricts the swelling of natural rubber vulcanizates in n -decane has been determined using a vulcanizing system in which the stoichiometry of crosslinking is unaffected by the carbon black. The dependence of the degree of restriction, as measured by the ratio of the volume frac…
Abstract The adsorption of various alkylammonium cations from aqueous solution by sodium and calcium montmorillonite has been studied. Adsorption occurred through an exchange reaction between the inorganic cations on the clay and the alkylammonium ions in solution. The affinity of the clay for these cations was linear…
Abstract Die Menge der an der Oberfläche gebundenen OH‐Gruppen wurde bei einem feinteiligen Anatas durch Deuterium‐Austausch, Acetylierung und Reaktion mit SOCl 2 bestimmt. Nach Entgasen bei 150° wurden etwa 4,9 OH‐Gruppen/100 Å 2 gefunden, gegenäber einer fär eine vollständig hydroxylierte Oberfläche abgeschätzten Me…
Small metal particles have been formed on α-Al2O3 films and equilibrated to give the minimum surface energy shapes. Determination of the equilibrated shape by transmission electron microscopy allows the interfacial energy of the solid-solid system to be determined. Values of γ interface are given for the systems Au, A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRare earths. IV. Dissociation energies of the gaseous monoxides of the rare earthsLynford L. Ames, Patrick N. Walsh, and David WhiteCite this: J. Phys. Chem. 1967, 71, 8, 2707–2718Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Published in…
The deformation of neutron-irradiated copper single crystals has been studied by transmission electron microscopy techniques. The width of the defect-free channels formed by the passage of dislocations has been measured as a function of temperature, dose and strain, in sections cut normal to the primary glide plane. T…
Abstract Die Darstellung von Tetraphenylarsonium‐, ‐phosphonium‐ oder Ammonium‐Salzen der Azido‐Komplexe [Sn(N 3 ) 6 ] 3‐ , [Pb(N 3 ) 6 ] 2‐ , [Cr(N 3 ) 6 ] 3‐ , [Rh(N 3 ) 6 ] 2‐ , [Pt(N 3 ) 6 ] 2‐ . [Mn(N 3 ) 4 ] 2‐ , [Pd(N 3 ) 4 ] 2‐ , [Pd 2 (N 3 ) 6 ] 2‐ , [Pt(N 3 ) 4 ] 2‐ , [Au(N 3 ) 4 ] − , [Zn(N 3 ) 4 ] 2‐ , [Cd…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMass spectrometry of porphyrins. II. Characterization of petroporphyrinsEarl Wayne. Baker, Teh Fu. Yen, John P. Dickie, Robert E. Rhodes, and Leslie F. ClarkCite this: J. Am. Chem. Soc. 1967, 89, 14, 3631–3639Publication Date (Print):July 1, 1967Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrecision and sensitivity in electron microprobe analysisThomas O. ZieboldCite this: Anal. Chem. 1967, 39, 8, 858–861Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Published inissue 1 July 1967https://pubs.acs.org/doi/10.1021/ac60252a028ht…
When a composite body consisting of two isotropic and elastic phases is subjected to prescribed surface tractions, generally the stress field depends on three parameters involving the elastic con stants. If the composite is in a state of plane deformation, and there are no net forces on internal boundaries, however, t…
The illumination of the ferroelectric SbSI in the spectral region where a maximum of photoconductivity of this crystal took place (λ ≃ 6200 Å) decreased the ferroelectric polarization. This resulted in the appearance of a region of saturation of the V-I characteristic and in the decrease of the pyrocurrent, being meas…
Thermal-conductivity measurements have been made as a function of temperature on sodium chloride crystals containing the nine monovalent substitutional impurities: ${\mathrm{F}}^{\ensuremath{-}}$, ${\mathrm{Br}}^{\ensuremath{-}}$, ${\mathrm{I}}^{\ensuremath{-}}$, ${\mathrm{Li}}^{+}$, ${\mathrm{K}}^{+}$, ${\mathrm{Rb}}…
The kinetic energy spectrum of photoelectrons ejected from ammonia by monochromatic 584 Å (21.21 eV) radiation has been determined using a spherical grid energy analyzer. Ionization potentials of 10.35 and 14.95 eV have been deduced from the spectrum and the relative transition probabilities to the ionic states have b…
Cesium methylsulfonate, CsCH 3 SO 3 , crystallizes in space group Pnma with a = 9.526, b = 6.264, and c = 8.692 Å. Three-dimensional X-ray diffraction data have been collected photographically and refined to give a weighted agreement index (R) of 0.12. The structure is related to, but is not identical with, that of th…
The crystal structures of RuS 2 , OsS 2 , RuTe 2 , and OsTe 2 were refined isotropically by least squares from powder diffractometer data using individual temperature factors. The resulting positional parameters of the chalcogen atoms in these C2-type structures are 0.3879 ± 14, 0.3865 ± 19, 0.3739 ± 9, and 0.3725 ± 1…
The Hall coefficient ${R}_{H}$ and resistivity $\ensuremath{\rho}$ have been measured on ceramic samples of $p$-type CoO and NiO between 200 and 1500\ifmmode^\circ\else\textdegree\fi{}K and of $n$-type $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ between 960 and 1500\ifmmode^\circ\else\textdegr…