Materials Literature
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Escherichia coli hosts expressing fabG of Pseudomonas aeruginosa showed 3-ketoacyl coenzyme A (CoA) reductase activity toward R-3-hydroxyoctanoyl-CoA. Furthermore, E. coli recombinants carrying the poly-3-hydroxyalkanoate (PHA) polymerase-encoding gene phaC in addition to fabG accumulated medium-chain-length PHAs (mcl…
We use the instantaneous normal mode approach to provide a description of the local curvature of the potential energy surface of a model for water. We focus on the region of the phase diagram in which the dynamics may be described by mode-coupling theory. We find that the diffusion constant depends on the fraction of…
We have investigated theoretically the STM images and conductance signatures of defective carbon nanotubes. The defects considered are those that form on nanotubes under tension, both in the absence and presence of additional carbon atoms. The most prominent features observed in the STM images are a set of bright ring…
We present new evidence supporting the quasi-unit-cell description of the Al72Ni20Co8 decagonal quasicrystal which shows that the solid is composed of repeating, overlapping decagonal cluster columns with broken tenfold symmetry. We propose an atomic model which gives a significantly improved fit to electron microscop…
Thermal expansion and magnetostriction both in the a b -plane and along the c -axis of double-layered perovskite manganite (La 1- z Pr z ) 1.2 Sr 1.8 Mn 2 O 7 ( z =0 and 0.2) single crystals have been measured as a function of temperature and magnetic field. The magnitude and the sign of the lattice striction were str…
Elementary energy bands in solids are defined generalizing the notion of simple and composite energy bands. All energy branches of elementary energy bands are connected. Following the connectivity of the energy branches in elementary energy bands, a new notion of unavoidable degeneracy is established, for which the cr…
Magnetic phase diagram of NiS2-xSex has been reexamined by systematic studies of electrical resistivity, uniform magnetic susceptibility and neutron diffraction using single crystals grown by a chemical transport method. The electrical resistivity and the uniform magnetic susceptibility exhibit the same feature of tem…
The electron density distribution of the molecular pyroelectric material phosphangulene has been studied by multipolar modeling of X-ray diffraction data. The "in-crystal" molecular dipole moment has been evaluated to 4.7 D corresponding to a 42% dipole moment enhancement compared with the dipole moment measured in a…
Scanning electron microscopy, X-ray diffraction, photoelectrochemistry and microphotoelectrochemistry have been used to characterize thin chromia scales, in the micrometer range, grown on pure chromium at 900°C in oxygen and in water vapour. The duplex structure formed, more easily observable in water vapour grows by…
Thermoelectric power was used to elucidate the electrical transport properties of aligned and randomly oriented carbon nanotube systems in the temperature range 77--450 K. A weakly negative thermoelectric power, comparable with that of a graphite flake, was observed for a macroscopic bundle of multiwall carbon nanotub…
Within the local-density approximation, the interlayer binding and the electronic properties of graphite and ``graphitic'' Si have been determined. For graphite, the optimized equilibrium lattice constant agrees well with the experimental value. The role of ${2p}_{z}$ orbitals $(\ensuremath{\pi}$ states) turned out to…
The optical properties of well-aligned multiwalled carbon nanotube bundles are studied within the gradient approximation. The imaginary (real) part of the transverse dielectric function exhibits a special peak (dip) at frequency $\ensuremath{\omega}\ensuremath{\sim}2{\ensuremath{\gamma}}_{0}$ $({\ensuremath{\gamma}}_{…
The electromagnetic response of a zero-order metal grating having a primary deep short-period component and a shallow long-period component is modeled. It is found that such a metal grating has an unusual surface-plasmon-polariton band structure and exhibits strong selective absorption of incident radiation. This open…
Die Veresterung eines repräsentativen redoxaktiven Polyoxometallats (POM), [H4P2V3W15O62]5−, mit Methanol und zwei einfachen Dendrimeren, die jeweils vier Tris(hydroxymethyl)-Endgruppen enthalten, wurde untersucht. Die Tetra(polyoxometallat)dendrimere sind gegen Hydrolyse stabil, und 1 katalysiert die Oxidation von Te…
We present a core level X-ray photoelectron spectroscopy study of ${\mathrm{Ni}}_{x}{\mathrm{Mg}}_{1\ensuremath{-}x}\mathrm{O}$ crystals with $0.03<x<1$. We show that nonlocal effects involving inter-Ni-site fluctuations strongly influence the Ni $2p$ core-level spectra for higher Ni concentrations including NiO…
The absorption edge of hexagonal (NiAs structure) antiferromagnetic MnTe has been measured by means of light transmission experiments carried out at different temperatures in the range 16--420 K $(P=1\mathrm{bar})$ and hydrostatic pressures up to 9 GPa $(T=295\mathrm{K}).$ An indirect band gap has been found, in agree…
A tight-binding parametrization of the band structure, along with a mean-field treatment of the Hund, electron-electron, and electron-lattice couplings, is used to obtain the full optical conductivity tensor of ${\mathrm{LaMnO}}_{3}$ as a function of temperature. We predict striking changes with temperature in the fun…
Quinoidalization results in amazingly intense near-IR absorption in 1 (λmax=1080 nm), whereas the shorter dimer 2 (λmax=780 nm) is less conjugated because steric interactions force it into a contorted geometry. The crystal structure of 1 shows that the 62-atom chromophore is bow-shaped in the solid state.
Dielectric susceptibility, X-ray diffraction and infrared molecular vibrational spectra have been investigated for a charge-transfer complex, tetrathiafulvalene (TTF)-2-bromo-3,5,6-trichloro- p -benzoquinone (QBrCl 3 ) to probe a ferroelectric valence transition at T c =66 K in comparison with the typical first-order…
Epitaxial SrBi2Nb2O9 thin films have been grown with a (103) orientation on (111) SrTiO3 substrates by pulsed-laser deposition. Four-circle x-ray diffraction and transmission electron microscopy reveal nearly phase-pure epitaxial films. Epitaxial (111) SrRuO3 electrodes enabled the electrical properties of these (103)…