Materials Literature
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In the presence of reducing gases thin NiO films show reversible changes for visible–near-IR light absorption, a phenomenon which can be applied to the optical detection of CO in air. The deposition of highly dispersed Au on NiO films by a deposition–precipitation method significantly enhances the optical sensitivity…
Catalase activity of manganese porphyrin dimers linked by various spacer molecules reveals a remarkable relationship between Mn–Mn separation and arrangement; the highest turnover rate is observed when the two Mn ions can cooperatively interact with a H2O2 molecule in the catalyst cavity.
A modified method for the synthesis and separation of endo and exo guanosine 2',3'-cyclophosphorothioate (cGPS) has been developed. The exo diastereoisomer has been co-crystallized with RNase T1. cGPS is known to be a RNase T1 inhibitor but is also a very slow substrate. It was hydrolyzed during the crystallization, l…
We have been active in the synthesis and characterization of tin-based antitumour compounds for several years and we would like to summarize here the results that have already been patented(1) and that may therefore be disclosed(2). We synthesized some diorganotin 2,6-pyridinedicarboxylates.The dimethyltin compound ha…
Electron Energy Loss Spectroscopy, at Mn M2,3 and L2,3 edges is used in order to investigate the ionization state of manganese in a new oxybromide compound. The experimental procedure and the various approaches used to determine Mn oxidation state (edge energy shifts and L3/L2 ratios) are tested on a wellknown mangane…
cDNA clones coding cecropins A and B were isolated from a cDNA library constructed from the fat body of immunized Bombyx mori larvae. The cloned cDNAs had an open reading frame of 63 amino acids, indicating the primary translated peptides were processed to form mature cecropins of 35 amino acid residues. The homology…
We have built a new TEM heating stage permitting the in situ application of an electric field on sample surfaces and have performed experiments on ferroelectric domain switching in BaTiO3. The domain growth induced by the electric field first occurs by domain tip motion and then by the lateral shift of walls. A memory…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-liquid equilibria for the oleic acid-.beta.-sitosterol-water system at elevated temperatures and pressuresJose A. Briones, Joseph C. Mullins, and Mark C. ThiesCite this: Ind. Eng. Chem. Res. 1994, 33, 1, 151–156Publication Date (Print):January 1, 1994Publication Histo…
Single crystals of the complex perovskite Pb(Fe2/3 W1/3)O3 [PFW], synthesized from high temperature solution growth, have been studied by optical and dielectric characterizations at zero field and under an electric bias field. It was found that at zero electric field the PFW crystals remain optically isotropic down to…
Considering the possibility of liquid crystalline (LC) polymers at first, they seem to be difficult to achieve, because polymer chains usually adopt a statistical coil conformation, whereas LC-phases possess an orientational and/or a positional long-range order. Nevertheless, polymer chains can be combined with liquid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmino acid complexes of palladium(II). 1. NMR study of the reactions of the diaqua(ethylenediamine)palladium(II) cation with ammonia, betaine, and the amino acids +NH3(CH2)nCO2- (n = 1-3)Trevor G. Appleton, Alicia J. Bailey, Danny R. Bedgood Jr., and John R. HallCite this: I…
Abstract Ge 1– x Si x crystals were grown with the Bridgman and the Czochralski method over a wide concentration range. With the Bridgman process single crystals up to 40 at.% Si were possible. The reasons for polycrystalline growth were the permanent contact of the interface with the crucible wall in combination with…
In connection with a study of the fiber reinforcement of wood, a number of silane coupling agents were evaluated in the bonding of basalt fibers to phenolic and isocyanate resins most commonly used in wood bonding. Interfacial shear strength improvement before and after 1 h boiling in water was determined, utilizing a…
Methods have been developed for covalently linking [Mn4O2(O2CPh)6(dbm)2]2(dbmH = dibenzoylmethane) units to give a dimer and a polymer; treatment of 2 with trans-1,2-bis(4-pyridyl)ethene (bpe) or 4,4′-bipyridine (4,4′-bpy) yields [Mn4O2(O2CPh)6(dbm)2(bpe)]24 and [Mn4O2(O2CPh)6(dbm)2(4,4′-bpy)]n5, respectively.
ADVERTISEMENT RETURN TO ISSUEArticleNEXTStructural Distortion of CH3I in an Ion-Dipole Precursor ComplexWei Ping Hu and Donald G. TruhlarCite this: J. Phys. Chem. 1994, 98, 4, 1049–1052Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs…
The Peierls stress is calculated for a discrete Peierls—Nabarro model of a dislocation. Unlike the original continuum model where a continuous distribution of infinitesimal dislocations was considered, the discreteness of the slip plane is maintained throughout the calculation, and the Peierls stress τp is determined…
There is ample evidence in the literature of the effects of reactor irradiation on the microstructure and corrosion behavior of zirconium alloys. Specifically, it has been shown that boiling water reactor (BWR) irradiation generally induces nodular corrosion and causes marked changes in precipitate structure and compo…
The properties of rare-earth-containing oxynitride glasses in the Ln-Si-Al-O-N systems (Ln=Dy, Er, Gd, La, Nd, Sm, Y, Yb) were investigated and the following results were obtained.(1) The glass transition temperature and the softening temperature in these glasses are in a range of 915-950°C and 960-1020°C, respectivel…
Observations of the photoredox reactivity of antimony(III) porphyrin complexes are reported. Upon irradiation with visible light under ambient conditions, a photooxidation to the corresponding dihydroxoantimony(V) porphyrins occurs. At the same time a two-electron or four-electron reduction of molecular oxygen takes p…
This paper discusses the characteristics of noise sources in Al-based thin films and their relationships to VLSI reliability. Techniques of applying noise measurements in detecting existing defects/damages in the films, determining electromigration activation energy, and predicting the time to failure of VLSI intercon…