Materials Literature
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Formation of a bienzyme complex of pig heart mitochondrial malate dehydrogenase and citrate synthase in a buffered system is demonstrated by means of a covalently attached fluorescent probe to citrate synthase. Assuming 1:1 stoichiometry of the enzymes in the complex, an apparent dissociation constant of 10(-6) M was…
Using an assay based on polypeptide mobility in one- and two-dimensional polyacrylamide electropherograms, we purified the Salmonella typhimurium cysB protein from an Escherichia coli strain carrying plasmid pGBK14, in which the S. typhimurium cysB gene is under transcriptional control of the strong promoter PL from p…
Abstract A novel heteropolytungstate salt [(CH3)4N]6[H3BiW18O60] is prepared and its crystal structure is determined : monoclinic, P21/c, a=13.986(7) Å, b=15,134(2), c=23.250(8), β=115.32(3)°, Z=2. The anion has the same framework as that found in 18-tungstoarsenate(III)(AsW18O60). The Bi atom is coordinated by three…
A method for evaluating stresses in coatings on brittle substrates by indentation is described. The basis for evaluations is fracture mechanics model of the radial crack system in the Vickers geometary, incorpeorating the effects of a thin surface demonstrate the methodology. The crack size on these coated specimens a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of thermal decomposition of nylon 66Alberto Ballistreri, Domenico Garozzo, Mario Giuffrida, and Giorgio MontaudoCite this: Macromolecules 1987, 20, 12, 2991–2997Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 Ma…
Absorption and scattering losses of visible radiation in nematic liquid crystals (LCs) were measured by an improved transmission technique. The absorption loss of the E-7 LC mixture was found to be ~1 order of magnitude larger than the scattering in the isotropic state. On the contrary, light scattering surpasses abso…
Benzo[a]pyrene-7,8-diol-9,10 epoxide (BPDE)-DNA adducts have been analyzed by surface-enhanced Raman scattering (SERS) spectrometry. BPDE is the ultimate carcinogenic metabolite of benzo[a]pyrene. The SERS measurements were performed with the use of a silver-coated cellulose material as the SERS-active substrate. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of morphology on the transport of gases in block copolymersDavid J. Kinning, Edwin L. Thomas, and Julio M. OttinoCite this: Macromolecules 1987, 20, 5, 1129–1133Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1…
We now report the results of kinetic and trapping experiments performed in acetylene/benzene and acetylene/toluene mixtures above 820 K by modulated beam dynamic mass spectrometry which provide direct evidence of vinylidene participation in chemical reactions. Under such conditions the fast equilibrium \nHC=CH ⇌…
Measurements were made of the enthalpy changes, using sorption isotherms, and of the changes in dielectric response of microcrystalline cellulose discs when different amounts of water were added. The results are explained by means of a molecular model in which the water is sorbed in a step-wise process of hydrogen bon…
Abstract In summary, the solid-state C-13 NMR technique has proven to be a significant method for the detection of crosslinks and other structural modifications in sulfur-vulcanized NR systems. The use of sulfur as a crosslinking agent by itself generates a considerable amount of main-chain structural modifications. C…
Abstract The pore-size and particle-size distributions as well as the surface areas of Cs3PW12O40 and Cs3PMo12O40 have been determined by N2 adsorption and electron micrograph. It was first demonstrated by the quantitative comparison of these data that their micro-and/ or mesopores which gave these compounds very high…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational calculations on poly(di-n-hexylsilane)B. L. Farmer, J. F. Rabolt, and R. D. MillerCite this: Macromolecules 1987, 20, 5, 1167–1169Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1987https://pubs.acs.org…
The propagation range of surface plasmons in thin-metal-film geometries can be considerably increased if a suitable dielectric layer is placed in parallel to the film. The results show that this range extension depends strongly on the separation between the metal film and the dielectric layer.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic properties of dinuclear copper(II) complexes of 2,6-bis(N-(2-pyridylmethyl)formimidoyl)-4-methylphenolate with azido and cyanato-0 exogenous ligandsTalal Mallah, Olivier Kahn, Jacqueline Gouteron, Suzanne Jeannin, Yves Jeannin, and Charles J.…
Thermal shock testing of an alumina‐20 vol% SiC whisker composite showed no decrease in flexural strength with temperature differences up to 900°C. Alumina, on the other hand, normally shows a significant decrease inflexural strength with a temperature change of >400°C. The improvement in the thermal shock resistan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of a weak intermolecular photosensitive complex between an organic substrate and a polyoxometalate. Crystal and molecular structure of .alpha.-H3PMo12O40.cntdot.6DMA.cntdot.CH3CN.cntdot.0.5H2O (DMA = N,N-dimethylacetamide)Michael M. Williamson, Donald A. Bou…
The polymorphism of enstatite (MgSiO 3 ) is reviewed. Three stable phases occur—clinoenstatite, orthoenstatite, and protoenstatite, being stable at low, intermediate, and elevated temperatures, respectively — and new data concerning their crystallization from synthetic glasses are summarized. The phase transformations…
A test particle model (T-model) potential is derived for interacting rigid formamide (HCONH2) molecules and applied in MD simulations of the liquid phase. The most important features of the dimers predicted by the T-model potential are checked by large basis set SCF calculations. The most stable dimer is the cyclic ar…
Reaction of anionic platinum(II) derivatives (NBu4)[Pt(C6F5)3L] with O3ClOAgL′ affords the neutral heterobinuclear complexes (C6F5)3LPtAgL′ (L′ = PPh3, PEt3; L = SC4H8, PPh3, PEt3, PEtPh2, NC5H5) containing a direct Pt-Ag bond unsupported by covalent bridges. The molecular structure of a representative compound (L = S…