Materials Literature
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A new weighting scheme for the minimization function used in the Rietveld method for structure refinement using powder diffraction data is proposed. It has the form w = 1/Yeo with e ≃ 2 (Yo = observed profile intensity) and gives relatively heavier weights on weak intensities than weighting schemes currently used in t…
The influence of sulfate‐reducing bacteria (SRB) on the passivity of a Mo‐bearing austenitic stainless steel (SS), type 317L, was investigated using X‐ray photoelectron spectroscopy (XPS) and electrochemical techniques. Samples were exposed to a SRB culture, and then resultant surface states were analyzed by XPS and c…
Hocherman and Rosenau conjectured that long-wave unstable Cahn-Hilliard-type interface models develop finite-time singularities when the nonlinearity in the destabilizing term grows faster at large amplitudes than the nonlinearity in the stabilizing term (Phys.˜ D 67, 1993, pp. 113–125). We consider this conjecture fo…
The individual chains in the triple helix of collagen occur in a conformation related to polyproline II because of the presence of large number of imino peptide bonds. However, these residues are not evenly distributed in the collagen molecule which also contains many non-imino residues. These non-imino regions of col…
Sucrose is the major carbon source in molasses, the traditional substrate employed in the industrial acetonebutanol-ethanol (ABE) fermentation by solventogenic clostridia. The utilization of sucrose by Clostridium beijerinckii NCIMB 8052 was investigated. Extracts prepared from cultures grown on sucrose (but not xylos…
Single crystals of MnSiO(SiO 4 ) with the titanite structure together with MnSiO 3 clinopyroxene were synthesized from a MnO-SiO 2 oxide mixture at 1000 8C and 9.2 GPa in a multi-anvil press. The crystal structure of MnSi 2 O 5 [space group C2/c, a = 6.332(1) Å , b = 8.161(1) Å , c = 6.583(1) Å , β = 114.459(3)8, and…
A Mn–Zn ferrite with a grain size of about 2 μm has been developed for the transformer driven at around 1 MHz. The developed ferrite exhibits considerably lower core losses than a conventional Mn–Zn ferrite with a grain size of about 10 μm at a frequency of 0.5 to 2 MHz. The thin-type transformer using the developed f…
Diastolic dysfunction is an important cause of congestive heart failure; however, the basic mechanisms causing diastolic congestive heart failure are not fully understood, especially the role of the cardiac muscle cell, or cardiocyte, in this process. Before the role of the cardiocyte in this pathophysiology can be de…
Reduction of nitro, amide, carboxylate, ester and nitrile functional groups to -NH2, -CH2NH2, -CH2OH, -CH2OH and -CH2NCHPh, respectively were achieved using NaBH4 or NaBH4/LiCl in diglyme at 125—162 °C. This greatly extends the range of functional group types which can be considered generally reducible by borohydride.
The crystal structure of Saccharomyces cerevisiae cytoplasmic aspartate aminotransferase (EC 2.6.1.1) has been determined to 2.05 A resolution in the presence of the cofactor pyridoxal-5'-phosphate and the competitive inhibitor maleate. The structure was solved by the method of molecular replacement. The final value o…
Electrochromism of nanocrystalline films under cathodic bias in propylene carbonate containing was studied by time‐dependent absorption and fluorescence spectroscopies. The absorption spectra revealed two absorption bands near 700 and 420 nm. The absorption band near 700 nm showed a blue shift and an increase in absor…
Soft x-ray resonant magnetic reflectivity measurements on thin films and multilayers in a transverse geometry using linear polarized photons are presented. Magneto-optic calculations taking into account the layer roughness allows us to reproduce all the experimental features of the angular and energy reflectivity curv…
Low-molecular-weight compounds often crystallizes to systems with 100% crystallinity. There are only a few examples where a small amorphous fraction, characterized by a glass transition, remains after long time crystallization from the melt. The crystallization of such a glass-forming low-molecular-weight compound was…
Mullite/Al 2 O 3 functionally graded ceramics (FGCs) have been obtained by sequential slip casting and subsequently firing at 1650°C in air. Functionally graded layered dense (similar/congruent99% of the theoretical density) compacts, with five different layers with thickness ranging from 670 to 850 µm, were obtained.…
Undercooled Nd–Fe–B melts with compositions near the Nd2Fe14B phase (Φ phase) were studied by the electromagnetic levitation technique. In situ measurements of the solidification kinetics were accomplished and melt drops with controlled undercooling were quenched onto chill substrates in order to reveal the solidifica…
When E. coli cells were grown in minimal medium supplemented with D-ribose and D-xylose, a diauxic growth preferring D-xylose was observed. Transcription of the ribose (rbs) operon was repressed in the presence of D-xylose, phenotypically similar to catabolite repression by D-glucose, although D-ribose did not affect…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAttenuated Total Reflection Fourier Transform Infrared Spectroscopy Study of Poly(methyl methacrylate) Adsorption on a Silica Thin Film: Polymer/Surface InteractionsJean-Marc Berquier and Hervé ArribartView Author Information Laboratoire CNRS Saint-Gobain, "Surface du Verre et…
The use of the reverse Monte Carlo (RMC) technique for analysing diffuse scattering data from single crystals is compared with the well established direct Monte Carlo (MC) method. Whereas in the MC method a model involving only a few interatomic interaction parameters is used, for RMC the atom coordinates themselves a…
Brillouin scattering from transverse-acoustic modes of ${\mathrm{SrTiO}}_{3}$ is observed, while the frequencies of the soft polar modes are remeasured with hyper-Raman scattering. It is shown that an anomalous decrease of sound velocities at low temperatures results from the coupling of the strain with the gradient o…
Using the Green's function and eigenstrain method, we derived an analytical expression for the elastic displacement fields induced by a dislocation in an icosahedral quasicrystal. In this paper, we calculate the special case where the line direction of the dislocation is parallel to a fivefold axis. Combining this exp…