Materials Literature
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Uridine diphosphoglucose 4-epimerase (EC 5.1.3.2) of Saccharomyces cerevisiae was purified to homogeneity with a yield of 30%. The purification procedure involved ammonium sulfate precipitation, streptomycin treatment, chromatography on diethylaminoethyl cellulose and hydroxylapatite, and Bio-Gel A-0.5m gel filtration…
Paramagnetic centres are produced in vitreous (v)-SiO2 by the trapping of photogenerated electrons and holes at the intrinsic bonding defect centres associated with over- and under-coordinated oxygen atoms, C3 + and C1- respectively. Capture of a hole by the C1- converts that centre to C1 0, the oxygen hole centre (OH…
Abstract The fine structure of bulk trans ‐polyacetylene (PA) was investigated by x‐ray diffraction. The degree of crystallinity 0.81, determined by Ruland's method, was significantly higher than the value for linear polyethylene. The disorder parameter k was 5, which is much larger than the value for polyethylene. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of substituted pyridines on the redox reactions of iron porphyrinsK. M. Kadish and L. A. BottomleyCite this: Inorg. Chem. 1980, 19, 4, 832–836Publication Date (Print):April 1, 1980Publication History Published online1 May 2002Published inissue 1 April 1980https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the catalytic hydrogen production by gold sols. Hydrogen/deuterium isotope effect studiesKenneth Kopple, Dan Meyerstein, and Dan MeiselCite this: J. Phys. Chem. 1980, 84, 8, 870–875Publication Date (Print):April 1, 1980Publication History Published online1 May 2…
The magnetic properties of Laves phase compound PrFe 2 , synthesised at high pressure, were studied by Mossbauer spectroscopy and saturation magnetisation. The ferromagnetism in PrFe 2 has been confirmed. The rotation of the easy axis of magnetisation on the (110) plane to (111) with respect to (001) was observed as t…
A rational synthesis of transition metal dithiene complexes with mesophorphic properties is reported. In addition to the nickel complexes described earlier, we have now obtained the Pd and Pt congerers. While the Ni and Pt complexes show, depending on the length of the para-n-alkyl chains, smectic or nematic mesophase…
Abstract A review of the literature on wool wax hydrocarbons reveals that the hydrocarbons represent about 0.5% of wool wax and that they consist of a large number of normal and branched homologs. This, in turn, shows a structural similarity between the hydrocarbons and the wool wax acids or wool wax aliphatic alcohol…
Abstract Experimental studies of diethyl adipate saponification in a CSTR show that forced cycling of feed composition produces significant yield increases in intermediate product relative to the optimal steady state operation, while forced temperature cycling has much less effect. Related experiments provide useful t…
Drei unterschiedliche, isolierte anionische SbSe-Gruppen - die ersten Selenoantimonat(III)-Ionen überhaupt - sind in Ba4Sb4Se11 enthalten. Die formale Verknüpfung von Pyramiden zu zweikernigen Gebilden war bei SbIII-Verbindungen bisher nicht bekannt. (Graue Kreise: Sb, weiße Kreise: Se.)
Abstract The hyperfine fields at Fe and Sn, as determined by Mössbauer effect and NMR, in a new Heusler alloy Ru 2 FeSn, are reported. By comparison with corresponding data in rhodium based Heusler alloys, it is inferred that a preferential R–Sn (R = Ru or Rh) disorder exists in these alloys. The hyperfine field data…
BaZnSnS 4 and BaMnSnS 4 were prepared for the first time and the atomic positions of the crystal structure were refined. Both compounds crystallize isotypically with BaCdSnS 4 [1]. Space group C 19 2v -Fdd2 (No. 43) orthorhombic. BaZnSnS 4 : a = 2196, 4 ; b = 2150, 4 ; c = 1270, 1 pm; BaMnSnS 4 : a = 2173, 1 ; b = 214…
A calculation of γ(r), the correlation function which gives the X-ray scattering of a cubic object of uniform density, is given for the full range of r. A new method, which can be applied to other systems, is used. The function γ(r) and its first derivative are everywhere continuous, but γ′′(r) is discontinuous at r =…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoal tar coatings of storage tanks. A source of contamination of the potable water supplyKatherine. AlbenCite this: Environ. Sci. Technol. 1980, 14, 4, 468–470Publication Date (Print):April 1, 1980Publication History Published online1 May 2002Published inissue 1 April 1980ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe role of hydrogen bonding in the formation of bile salt micelles. 2. A demonstration of geometric effects on the stabilizing role of hydrogen bondingL. R. Fisher and D. G. OakenfullCite this: J. Phys. Chem. 1980, 84, 8, 936–937Publication Date (Print):April 1, 1980Publica…
Phase transitions involving one or more of the three properties: electrical resistivity, crystal structure, and antiferromagnetic ordering, occur in ${({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x})}_{2}{\mathrm{O}}_{3}$ with $x$ of the order of ${10}^{\ensuremath{-}2}$. In a previous study of Raman scattering in $…
Coordination polyhedra in crystals are identified by matching interbond angle matrices for observed and ideal polyhedra. An algorithm for permuting the N vertices of the observed polyhedron is described in which not all of the N! combinations are examined. The method has been used to identify a number of higher-coordi…
The development and use of electron and X-ray diffraction techniques to study the structure of grain boundaries in crystalline materials is reviewed. The fundamental questions that need to be answered about the structure of boundaries are discussed. The scattering expected from a small-angle twist boundary is calculat…
The steam electrolysis between 800° and 950°C has been investigated with a cell consisting of the following elements: electrolyte, 400μ of ytterbia stabilized zirconia; anode, 100μ of vacuum deposited tin doped india; cathode, a sputter deposited cermet of nickel and urania doped ytterbia stabilized zirconia. These ce…
The discovery, at Chalk River Nuclear Laboratories, of a simple method of wetproofing platinum catalysts so that they retain their activity in liquid water stimulated a concentrated research program for the development of catalysts for the hydrogen-water isotopic exchange reaction. This paper reviews 10 years of study…