Materials Literature
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1. The (R)-2-hydroxyglutaryl-CoA dehydratase system from Acidaminococcus fermentans was separated by chromatography of cell-free extracts on Q-Sepharose into two components, an activator and the actual dehydratase. The latter enzyme was further purified to homogeneity by chromatography on blue-Sepharose. It is an iron…
The recent discovery of a periodic distortion of the lattice structure of gamma -Fe precipitates in Cu motivated the authors to re-examine the magnetic structure of these precipitates using a neutron diffraction technique. They find that the spin structure is that of a longitudinal type-1 antiferromagnet as is well kn…
Abstract The effect of cold work on the transport of liquid methanol in crosslinked PMMA disks has been determined at temperatures from 35–56°C. Deformed samples absorb at fast rates with kinetics that approach those of Fickian diffusion. Undeformed samples sorb at lower rates and the kinetics tend toward those of Cas…
Abstract Fibers of organic polymers (polystyrene, cellulose acetate, and polypropylene) were formed by the rapid expansion of supercritical fluid solutions through a small diameter nozzle to ambient temperature and pressure. Solutions were prepared either by dissolving the polymer directly in room temperature pentane,…
The nucleotide and deduced amino acid sequences of the lacE and lacF genes, which code for the lactose-specific Enzyme II and Enzyme III of the Staphylococcus aureus phosphotransferase system, are presented. The primary translation products consist of a hydrophobic protein of 572 amino acids (Mr = 62,688) and a polype…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent titanium chemistry. Synthesis, reactivity, and x-ray and neutron diffraction studies of Ti(BH4)2(dmpe)2 and Ti(CH3)2(dmpe)2James A. Jensen, Scott R. Wilson, Arthur J. Schultz, and Gregory S. GirolamiCite this: J. Am. Chem. Soc. 1987, 109, 26, 8094–8096Publication Da…
Abstract A series of rigid rod polyimides 1a–f derived from pyromellitic anhydride (PMDA) and 2,5‐di‐n‐alkoxy‐1,4‐phenylenediamine containing flexible alkoxy side chains with 4 to 16 carbon atoms was prepared by solution polycondensation. As demonstrated by model experiments full conversion to the imide structure is a…
Slow strain rate tests (SSRTs) were conducted to study the effect of electrode potential on the intergranular stress corrosion cracking (IGSCC) of Alloy 600 in deaerated 0.01 M H3BO3 + 0.001 M LiOH solution at two different partial pressures of molecular hydrogen at 350 C, using tensile specimens with a cold-pressed h…
Time-domain spectroscopy is used to study the complex permittivity of two types of liquid crystals: heptylcyanobiphenyl (7CB) and octylcyanobiphenyl (8CB). The variation of the dominant relaxation frequency values of both 7CB and 8CB as a function of temperature are very similar, showing no influence of the smectic st…
Abstract have been investigated as function of substrate used and experimental conditions.
Abstract The hyper‐Raman spectra of K 2 SnCl 6 crystals were measured for various scattering geometries at ambient temperature. The F 2u deformation mode of [SnCl 6 ] 2− , which is inactive in infrared and Raman spectra but hyper‐Raman active, was observed at 112 cm −1 . The TO and LO frequencies of an F 1u species ar…
Abstract The production of reinforced plastics has constantly increased since the Second World War. With a forecast growth rate of 8 to 12 percent annually over the next decade, composites are one of the fastest growing sectors of the plastics industry. Advanced composites will show the largest expansion, due to a str…
The corrosion products of steel plate obtained in aqueous solution in the presence or absence of an external magnetic field of 40 oersted (Oe) were studied. The Mössbauer phase composition data of the rust show that the magnetic field has an influence on the corrosion mechanism.
Mr=419.87, trigonal, P3cl, a=7.198(1), c= 13.076 (1) ~k, V = 586.7 A, 3, Z = 6 (30 Mn and 12 Ge per unit cell), Dx=7.129Mgm -3, A(MoKa)= 071069~, /x=31.0mm -~, F(000)=1134.0, T= 295 K. The crystal structure of ~r2-MnsGe2 has been determined using diffraction data derived from a mixed crystal of ~r~-Mns.l~Ge2 and ~'2-M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced electron-transfer reaction from the excited triplet state of ethylindium(III) tetraphenylporphyrin to tetracyanoquinodimethane. Cleavage of the carbon-indium bond in 2-methyltetrahydrofuranMinoru Yamaji, Yoshimasa Hama, Shigeyoshi Arai, and Mikio HoshinoCite thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel for a cascade crystallizer in the presence of growth rate dispersionLie Ding Shiau and Kris A. BerglundCite this: Ind. Eng. Chem. Res. 1987, 26, 12, 2515–2521Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Published inissue 1 Dece…
Calcium aluminate glasses show high sensitivity to ultraviolet radiation without the doping of optically active components. A mechanism is proposed to account for their photosensitivity on the basis of the result that the cause of UV‐induced coloring is the emergence of two kinds of paramagnetic centers, an aluminum‐o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical and electrochemical characterization of the iron-iron multiple-bonded [Fe2(.eta.5-C5H5-xMex)2(.mu.-NO)2]n dimers (x = 0, 1, 5; n = 0, 1-): a structural-bonding analysis of the iron and cobalt nitrosyl bridged [M2(.eta.5-C5H5)2(.mu.-NO)2]n series (M = Fe, n = 0…
Alpha implantations in boron carbide samples were carried out different controlled temperatures ranging from 750 to 1720°C and the irradiated samples were observed in an electron microscope. Below 1500°C one part of the implanted helium produces lenticular bubbles within the grains whereas another part accumulates at…
Abstract The paper starts with some general introductory comments on properties and influence factors such as biocompatibility, surface structure, processibility and purity. Hence it is derived that polyurethanes deserve special attention as biomaterials, which is explained by the variability of the structure. A numbe…