Materials Literature
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Ba ++ , Pb ++ , and Cd ++ . The addition of Mn ++ , Ba ++ , and Ca ++ (10 mM) during the hydrolysis of Avicel PH 101 caused an increase in the total reducing sugar (TRS) for CBH I by 142, 135, and 114 percent, respectively. Those for CBH II increased by 177, 175, and 115 percent, respectively. The Mn ++ was the most s…
Terpolímeros de poli(álcool vinílico) foram sintetizados por meio de reação de esterificação do PVA parcialmente hidrolisado com cloretos de ácidos graxos de comprimento de cadeia diferentes. O objetivo da síntese foi obter polímeros à base de PVA com pequenas variações no balanço hidrófilo/lipófilo e nas propriedades…
A range of electron-rich organic molecules has been intercalated into MoS2 by the method of exfoliation–reflocculation. Intercalation produces an expansion of the lattice in a direction perpendicular to the dichalcogenide layers, the magnitude of which suggests that in the majority of cases, the guest adopts an orient…
The binding of tetracationic Λ- and Δ-europium complexes of tetraamide and triamide ligands incorporating an N-methylphenanthridinium group to calf-thymus DNA, poly(dGdC) and super-coiled plasmid DNA has been monitored by absorption, luminescence and CD difference spectroscopy. With the tetraamide complexes, preferent…
Efficient syntheses of the novel, pyrene containing branched building blocks 10, 13, 22, 25 and of a pyrene based core molecule 16 for the construction of dendrimers are reported. The main tool is a Suzuki cross-coupling. The functional groups for further growth are amines and carboxylic acids, which were used in an o…
Natural-silica-rich glasses (impactites, tektites and obsidians) have been investigated with infrared (IR), Raman and optical spectroscopy. Comparison with artificial glasses with silica-rich and alkali-rich compositions is made. The vibrational data of these compounds are discussed in relationship with their structur…
Let G be either GL 2 (R) or GL 2 (C) with maximal compact subgroup K. Let g be its complexified Lie algebra. In this paper, we will construct (g, K)-invariant forms on 3 i=1 i where i is an infinitesimal principal series representation.
Heat conditions for synthesis of Fe16N2 tine particles and the resulting magnetic properties were investigated. Commercial ultra fine γ - Fe2O3 particles were first reduced under hydrogen gas at temperatures between 200°C and 700°C for 8 hours and nitrided under an ammonia-argon mixed gas at 140°C for 24 hours. The po…
Addition of iron sulfate to Pt-promoted tungstated zirconia increases the activity and selectivity of the catalyst for isomerization of n-pentane in the presence of H2; selectivities >98% have been observed.
Polypyrrole (PPy)/ion-conducting polymer electrolyte (PE) composites are prepared by in situ electropolymerization of pyrrole in a solvent-free PE matrix which is formed by photocross-linking of triacrylated poly(ethylene oxide- co -propylene oxide) (TA). X-ray photoelectron spectroscopy measurements reveal the gradie…
The characterization of the structure of mumbaistatin (1), an effective inhibitor of the glucose-6-phosphatase system (EC 3.1.3.9), is reported. Isolation of mumbaistatin from cultures of Streptomyces sp. DSM 11641 was achieved by anion-exchange and reversed-phase chromatography. The acid-labile inhibitor was methylat…
While for intercalation compounds of natural smectites 2D long range order of the interlamellar space was never observed, in-plane order can be detected using a homogeneously charged synthetic fluorohectorite as host material. With these intercalates distinct 2D structures for enantiopure and racemic [Ru(bpy)3]2+-inte…
The dynamics of excited state indole–(NH 3 ) n clusters has been investigated with two-color two-photon ionization. Mass spectra recorded with delayed ionization indicate that a hydrogen transfer reaction indole(S 1 )–(NH 3 ) n → C 8 H 6 N • + NH 4 (NH 3 ) n – 1 occurs for n = 3, 4, 5.
Calcined Mg-Al hydrotalcite (Mg/Al = 4) has been conveniently employed as a heterogeneous base catalyst in the synthesis of 2-amino-3-cyanothiophenes adopting a one pot Gewald aminothiophene methodology.
Considerable interest has been generated in the use of lignocellulosic fibers and wastes (both agricultural and wood based) as fillers and reinforcements in thermoplastics. In general, present technologies limit fiber loading in thermoplastics to about 60 percent by weight of fiber. To produce high fiber content compo…
Hydrosilylation reactions have been used to functionalise the exterior surfaces of octavinyloctasilsesquioxane molecules to provide routes to octaaldehyde molecules. These have been characterised by NMR and MALDI (matrix assisted laser desorption/ionisation)-TOF mass spectroscopy. Further reactions of the molecules to…
In this paper focus is given to the insulation co-ordination of a closed system with integrated surge arresters. The calculations of transient overvoltages are made with typical applications of the integration of GIL in the 400 kV net of overhead lines. The overvoltages in the system are calculated and discussed for s…
A mannose isomerase from Agrobacterium radiobacter M-1 (formerly Pseudomonas sp. MI) was purified to electrophoretic homogeneity and characterized. A cell-free extract was separated by ammonium sulfate fractionation, Butyl-Toyopearl 650M, DEAE-Sepharose and hydroxylapatite column chromatography. Its molecular mass was…
Local modifications to the electronic structure during the bending deformation of carbon nanotubes are probed by in situ electron energy-loss spectroscopy. Reversible changes in the carbon K(1s) absorption near-edge fine structures are detected at the inner bending side for a multiwalled carbon nanotube and attributed…
This paper explores the solubility process from a number of perspectives, including the second law of thermodynamics and ideal solubility, real solutions and activity coefficients, intermolecular forces, and theories of gases or liquids or solids dissolving in liquids.