Materials Literature
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The heat capacity of N-(2-hydroxy-4-methoxybenzylildene)-4′-butylaniline(2,4-OHMBBA) with a purity of 99.393 mole % was measured between 13 and 375 K. The Melting point T m was 314.30 K, and the enthalpy and the entropy of fusion were 22.405 kJ mol−1 and 71.425 J K−1 mol−1, respectively. The temperature of transition…
The three-dimensional structure of the radical-cation radical-anion salt from 2,2′-bi-1,3-dithiole (1) and 7,7,8,8-tetracyanoquinodimethane (2) has been determined by X-ray diffraction methods; the structure is composed of segregated columnar stacks of cations and anions.
Abstract Glycine N-methyltransferase, an enzyme which methylates glycine in the N-position to yield sarcosine, has been purified to homogeneity from rabbit liver and partially characterized. The enzyme has a molecular weight of 123,500 as determined by sedimentation equilibrium centrifugation and consists of 3 to 4 no…
At the Freedericks transition of a nematic slab, the molecules can rotate by two different ways, giving rise to adjacent domains separated by a wall. We present observations on the structure and dynamics of these walls at magnetic fields above the transition. The local distortion through the wall agrees with theoretic…
Single-domain samples of cholesteric liquid crystals and of the recently reported twisted smectic C phase may have identical optical properties for light incident in the direction of the axis of twist. A single Bragg-reflection band exists for either type of liquid crystal in that case. However, with obliquely inciden…
The oxidative cleavage of haemin in aqueous pyridine under various conditions (ascorbic acid–oxygen; hydrazine–oxygen; and ascorbic acid–hydrogen peroxide) gives four isomeric biliverdins of the IX series which have been isolated (from a much improved ascorbic acid–oxygen reaction) as their crystalline dimethyl esters…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneralized Correlation for Fugacity Coefficients in Mixtures at Moderate Pressures. Application of Chemical Theory of Vapor ImperfectionsK. -H. Nothnagel, D. S. Abrams, and J. M. PrausnitzCite this: Ind. Eng. Chem. Process Des. Dev. 1973, 12, 1, 25–35Publication Date (Print…
Abstract In the homogeneous molybdenum‐catalysed epoxidation of olefins by tert ‐alkyl hydroperoxides two competing processes, epoxidation and hydroperoxide decomposition, have been delineated. Hydroperoxide decomposition involves free‐radical reactions initiated by electron‐transfer reactions of Mo(V) and Mo(VI) comp…
Abstract A brief summary of crystal growth models – the surface diffusion model of Burton, Cabrera and Frank and computer simulation models – is given and these models are confronted with measured ( R , σ) curves. It was found that the most ( R , σ) curves measured so far can be fitted by BCF curves with 10 −2 ≲ σ 1 ≲…
Crystal structure and lattice defects of the Ni-36.8 at% Al martensite have been investigated mainly by transmission electron microscopy. A structure of the martensite determined in the present work has a normal Ll0 type (CuAu I type) structure which is different from a modified Ll0 type (not CuAu I type) structure su…
Blocks of the kidney and other organs of the guinea pig fixed with glutaraldehyde and treated with tannic acid and osmium tetroxide could, without any coating, be observed in the scanning electron microscope. Undesirable charging effect was inconspicuous when accelerating voltage 5-25kV was used. A scanning image of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of iron(II) porphyrins by alkyl halidesRuth S. Wade and C. E. CastroCite this: J. Am. Chem. Soc. 1973, 95, 1, 226–230Publication Date (Print):January 1, 1973Publication History Published online1 May 2002Published inissue 1 January 1973https://pubs.acs.org/doi/10.10…
Nonstabilized 300 series stainless steels stressed over yield are susceptible to intergranular stress corrosion cracking (SCC) when exposed in the heavily sensitized condition to 288 C (550 F), high purity water containing dissolved oxygen. The effects of stress, oxygen levels, and significant metallurgical parameters…
D A Shirley Amsterdam: North Holland 1972 pp xii + 906 price $28·25 The book is a rapidly printed collection of the papers presented at an international conference held at Asilomar in California in September 1971. The rapid appearance is welcome although to this end the production is by a varitype process with unjusti…
Abstract It is shown how the stress field due to any prescribed continuous distribution of dislocations can be determined. The finite element method is employed giving wide freedom with regard to boundary geometry and material properties. The presentation is limited to situations which conform to either the standard p…
A detailed study has been made of the void and dislocation microstructure of Types 304 and 316 stainless steel irradiated with 4-MeV 58N+ at a displacement rate of 5 × 10-3 dpa/s-1. The range of dosages investigated were 20 to 350 dpa at 525 C (977 F) and 20 to 250 dpa at 600 C (1112 F) for Type 304 stainless steel an…
An indirect method has been developed for the stepwise titration of barium and strontium with EDTA, based on precipitation of the elements as sulphate from a homogeneous solution. Barium, strontium and other multivalent cations are complexed by titration with EDTA at pH 10·0 by using a mixed indicator comprising Erioc…
Experimental details of the 4T⇌2E‘equilibrium’ for the complex [CoII(tpa)2](ClO4)2(tpa = tri-2-pyridylamine) are given together with temperature-dependence studies of the magnetic behaviour of the hexafluorophosphate salt and of the corresponding 4-, 5-, and 6-methyl-substituted tri-2-pyridylamine complexes of cobalt(…
A survey is given on the structural family of beta brass related structural types. The members of this family are given by a vacancy forming process, by different possibilities of strains and by shifts. The multitude of structural types may be rationalized by a model which considers two spatial correlations of electro…
Low energy ions were injected into single crystal Cu, sintered UO2 and glass and the probabilities of entrapment measured, as a function of ion energy from 50 eV to 3 keV, by heating the targets after irradiation and recording the ratio of quantity of gas released to incident ion fluence. Values of entrapment probabil…