Materials Literature
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For Escherichia coli, growth on acetate requires the induction of the enzymes of the glyoxylate bypass, isocitrate lyase and malate synthase. The branch point between the glyoxylate bypass and the Krebs cycle is controlled by phosphorylation of isocitrate dehydrogenase (IDH), inhibiting that enzyme's activity and thus…
The basic performance requirements for heat-shrinkable components and the compounding and processing techniques that are used to meet these requirements are covered. The emphasis is on the electrical, mechanical, and environmental protection features of components for low-voltage (up to 1 kV) applications. The aim is…
Porous electrodes of Sr‐doped lanthanum manganite in a planar solid oxide fuel cell were made by the plasma spray technique. Spherical carbon particles were utilized as an effective pore former. Spraying a mixture of annealed oxide powders sized between 50 to 200 μm and 15 wt% solid Carbospheres resulted in a uniform…
A treatment based on Badger’s rule is used to estimate symmetric stretching frequencies νs of the nonbridging fluorides of various ZrFn groups in the presence of divalent and monovalent countercations. New vibrational spectra of MgZrF6, Ba2ZrF8, and β-BaZr2F10 are presented and incorporated into the method. The factor…
Previous studies have shown that rat incisor dentin contains a considerable amount of magnesium that is distributed heterogeneously. The cementum-related dentin, especially its incisal portion, is richest in magnesium. It was the purpose of the present study to investigate the changes that occur in the magnesium conte…
The thermodynamic solubility-product of kutnahorite, CaMn(CO)2, was measured following its dissolution in CO2-saturated deionized water and dilute NaCl solutions at 5 , 25o and 40oC. The logarithm of the equilibrium ion activity products derived from solution parameters and model estimates of the ion activity coeffici…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiation chemistry of cyanine dyes: oxidation and reduction of merocyanine 540Anthony Harriman, Lian C. T. Shoute, and P. NetaCite this: J. Phys. Chem. 1991, 95, 6, 2415–2420Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissu…
The mechanical properties of alumina have been successfully improved by adding isolated boron carbide particles of two different shapes. A K Ic of 7.26 ± 0.20 MPa · m 1/2 for alumina—boron carbide whiskerlike composites and of 5.27 ± 0.12 MPa · m 1/2 alumina—boron carbide shardlike particle composites has been achieve…
Abstract A temperature-programmed desorption of adsorbed dimethylpyridine clarified the characteristic changes in acid type, acid strength, and acid amount of silica–alumina prepared by depositing silica on an alumina support. Lewis acid sites of the alumina changed into Brønsted acid sites together with a change in t…
Influencing the Aggregation of Manganese Complexes by Different Bases: Formation of [Mn(O 2 CCF 3 ) 2 (py) 4 ] and [Mn 3 (O 2 CCF 3 ) 6 (benz) 6 ] Manganese powder reacts quantitatively with trifluoroacetic acid to yield Mn(O 2 CCF 3 ) 2 ( 1 ). The aggregation of 1 is directed by different N‐containing bases. Pyridine…
The solubility dependence of canavalin on both pH and temperature was determined. The results are presented both as a function of a single parameter (pH or temperature) and as a function of both. The final pH was studied as a function of initial pH and temperature. An estimate of the heat of crystallization of canaval…
The migration of electron density of a substrate (folate) on binding to an enzyme (dihydrofolate reductase) is studied by a quantum-mechanical method originally developed in solid state physics. A significant polarization of the substrate is induced by the enzyme, toward the transition state of the enzymatic reaction,…
In recent years the interest in hybrid bistable devices has increased rapidly because of the possibility of using these properties for optical computing systems. Therefore we investigate optoelectronic features of various CdS layers, pointing out especially the bistability in photoconduction presented by thermo-optica…
The structure of fasciated yams, spun from 2.4 dtex, 51 mm acrylic fibers on an air-jet experimental machine, consisted of an untwisted core of fibers and a surface layer of fibers wrapped around the greater part of the core length. The surface fiber wrapping varied markedly in appearance and gave distinctive, reoccur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigation-induced changes in metal-metal bonding in luminescent binuclear complexes containing gold(I) and iridium(I)Alan L. Balch and Vincent J. CatalanoCite this: Inorg. Chem. 1991, 30, 6, 1302–1308Publication Date (Print):March 1, 1991Publication History Published online1…
Methanococcus aeolicus, Methanococcus maripaludis, and Methanococcus voltae contain similar levels of four enzymes of branched-chain amino acid biosynthesis: acetohydroxy acid synthase, acetohydroxy acid isomeroreductase, dihydroxy acid dehydratase, and transaminase B. Following growth at low partial pressures of H2-C…
The biosynthesis of type I, type V and type VI collagens was studied by incubation of calf corneas in vitro with [3H]proline as a marker. Pepsin-solubilized collagen types were isolated by salt fractionation and quantified by SDS/PAGE. Expressed as proportions of the total hydroxyproline solubilized, corneal stroma co…
The apoprotein of glucose oxidase from Aspergillus niger was reconstituted with specifically 15N- and 13C-enriched FAD derivatives and investigated by 15N- and 13C-NMR spectroscopy. On the basis of the 15N-NMR results it is suggested that, in the oxidized state of glucose oxidase, hydrogen bonds are formed to the N(3)…
Abstract The angular dependence is investigated of the X‐ray absorption spectrum of TiK edge in TiO 2 recorded in the total electron yield mode. Despite the weak distortion of the octahedral coordination, the absorption spectra exhibit wide contrast which enables designation of the excited state orbitals involved in t…
Novel and reliable methods for the synthesis of the polymers [Cu(4-Xpz) 2 ] x (where X = H, Cl, Br, and Me; pz = pyrazolate) are presented. The X = Cl compound was obtained as green and brown forms. Single crystals of the polymers with X = Me and X = Cl (green form) suitable for X-ray analysis have been obtained. [Cu(…