Materials Literature
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The crystal structure of FMN-binding protein (FMN-bp) from Desulfovibrio vulgaris Miyazaki F was solved by the multiple isomorphous replacement method and refined to an R factor of 15.1% at 1.3 A resolution. FMN-bp exists in a dimeric form in the crystal, in contrast to the monomeric structure determined by NMR. R.m.s…
Recent studies demonstrate that near equiatomic Ti–Ni alloys possess high resistance to surface damage by wear. It is suggested that the high wear resistance of Ti–Ni alloys is closely correlated to their pseudoelasticity, which is usually evaluated by tensile testing. However, when a Ti–Ni alloy is under wear, its su…
The objective of this paper was to analyze the crystal aspect ratio (AR), the fracture toughness, and the fractal dimension of 3BaO . 5SiO 2 glass‐ceramics and to relate the topography of fracture surfaces to fractal behavior. These analyses demonstrate that crystal morphology strongly affects the fracture path, the f…
A new copper dry etching method has been discovered and studied. The process is based on an unique HCl plasma-copper reaction that forms a solution soluble copper chloride compound. The physical ( e.g. , morphology, profile, volume expansion, and anisotropy) and chemical ( e.g. , reaction mechanism) aspects of the sol…
The ferroelastic hysteresis is correlated with the propagation of twin walls under external stress. The wall thickness at T < < Tc varies between 1 nm and 7 nm for different materials. Individual twin walls can act as fast diffusion paths for dopants and lattice imperfections. Several twin walls can combine to form hi…
Copper(II) mononuclear complexes with the polyazamacrocyclic ligands NOTA (1,4,7-triazacyclononane-N,N′,N″triacetate), DOTA (1,4,7,10-tetraazacyclo-dodecane-N,N′,N″,N″′-tetraacetate), NOTP [1,4,7-triazacyclononane-N,N′,N″-tris(methylenephosphonate)] and DOTP [1,4,7,10tetraazacyclododecane-N,N′,N″,N‴-tetrakis(methylene…
The wavelength dependence of the one-photon absorption-induced photodegradation rate has been measured from the visible to the near IR for a variety of electro-optic chromophore-doped polymers. Systematic behavior is identified. The lifetime of the electro-optic activity is found to increase exponentially over 4-6 ord…
Abstract A study of structure development in thin melt spun isotactic polypropylene filaments is described, which is then applied to the prediction of the behavior of thick parts. Conditions under which different crystalline forms of polypropylene are obtained as a function of cooling rate and spinline stress were inv…
A lipase enzyme in combinati on with a protease enzyme has been used for dewaxing and degumming of silk and the combined effect of dewaxing and degumming on weight loss, wettability , dye uptake, yellowing, microscopic struc ture, handle and lustre has been studied. It is observed that the combined enzyme treated samp…
High‐pressure sintering behavior in the B 6 O– c ‐BN system was investigated using in‐laboratory‐synthesized B 6 O and commercially available c ‐BN powders (with an average grain size of 0.5, 3, or 6 μm). No reaction occurred between the two components under the high‐pressure (4–6 GPa) and high‐temperature (1500°–1800…
The mechanism of material removal of {001} diamond surfaces etched in a flow of 10% oxygen in argon at atmospheric pressure has been studied using ex situ and in situ differential interference contrast microscopy, atomic force microscopy and scanning electron microscopy. It is shown that shallow, square etch pits are…
Abstract Selected hydrazides and thiosemicarbazides of fatty acids with 11, 12, and 18 carbon atoms were synthesized and evaluated as corrosion inhibitors on mild steel and oil‐well steel (N‐80) in boiling 15% hydrochloric acid solution, by weight loss method. Potentiodynamic polarization studies carried out on mild s…
FePO4 is a quartz analogue that presents also an α−β phase transition from a P622 to a P32 phase. We describe in this paper the works done in view of obtaining single crystals, and discuss results showing that an incommensurate phase takes place in between α and β phases in a range of 17 C. The main α−β transition app…
International audience
The resistivity, magnetoresistance, and thermoelectric power (TEP) of ${R}_{1.4}({\mathrm{Sr}}_{1\ensuremath{-}y}{\mathrm{Ca}}_{y}{)}_{1.6}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ and $R({\mathrm{Sr}}_{1\ensuremath{-}y}{\mathrm{Ca}}_{y}{)}_{2}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}(R=\mathrm{L}\mathrm{a},\mathrm{}\mathrm{E}\mathr…
To identify hepatoprotective agents from plant sources we use primary cultures of rat hepatocytes injured by CCl4. The hepatoprotective agents are the compounds that mitigate the injury caused by CCl4. Using this system we have investigated the biochemical mechanisms involved in the hepatoprotective activity of cynand…
The optical properties of the heavy‐metal oxide glasses 70PbO . 30TiO 2 ,70PbO . 30CdO, and 70PbO . 30TeO 2 doped with Pr 3+ ,Nd 3+ ,and Eu 3+ ions have been investigated. The transition energies of the absorption spectra of Pr 3+ and Nd 3+ ions are analyzed for the Racah parameters, configuration interaction terms, a…
The kinetics of curing for a modified bismaleimide (BMI) has been investigated to ascertain a suitable cure model for the material. The experimental data for characterizing the curing kinetics for a modified bismaleimide resin were determined using a DSC isothermal scan method and indicated a curing mechanism involvin…
Mineralogical, chemical, and isotopic characteristics of clays from Ocean Drilling Program (ODP) sites 1035, 856, 1036, and 858, drilled in Middle Valley at the northern end of the Juan de Fuca Ridge during Legs 139 and 169, were studied using X-ray powder diffraction, differential thermal analysis, infrared spectrosc…
Medium-chain-length (mcl) poly(3-hydroxyalkanoates) (PHAs) are storage polymers that are produced from various substrates and accumulate in Pseudomonas strains belonging to rRNA homology group I. In experiments aimed at increasing PHA production in Pseudomonas strains, we generated an mcl PHA-overproducing mutant of P…