Materials Literature
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Structural proteomics is the determination of atomic resolution three-dimensional protein structures on a genome-wide scale in order to better understand the relationship between protein sequence, structure, and function. Here we describe our ongoing structural proteomics project on the nonmembrane proteins of the arc…
Abstract In the Cu(1 – x )Cr x VS system CuCr 1– x V x S 2 solid solutions isostructural with CuCrS 2 and Cu 3 VS 4 were found by replacement of Cr by V up to x = 0.20. The oxidation states of Cr and V were determined from structural data and paramagnetic susceptibility measurements. The CuCr 1– x V x S 2 solid soluti…
A method for cooling by the application of pressure was recently proposed. As in any other (magnetic) adiabatic cooling technique, the cooling results from a change in the magnetic entropy of the system under investigation. As opposed to the well known method of adiabatic demagnetization (for paramagnets) or to the ma…
The molecular and crystal structures of solvent-free potassium, rubidium, and cesium oxalates have been determined ab initio from high-resolution synchrotron and X-ray laboratory powder patterns. In the case of potassium oxalate K(2)C(2)O(4) (a = 10.91176(7) A, b = 6.11592(4) A, c = 3.44003(2) A, orthorhombic, Pbam, Z…
We present a consistent approach to the study of single (isolated) defects in crystals. This has three stages: (i) band structure calculation of a perfect host crystal is used to define the shape and size of the supercell adequately modeling a perfect crystal, (ii) further supercell point defect calculation for unrela…
Compounds CaAl(2)(-)(x)Mg(x) (0 < or = x < or = 2) were synthesized and structurally characterized by X-ray diffraction experiments. With increasing Mg content x the sequence of Laves phase structures MgCu(2) --> MgNi(2) --> MgZn(2) is revealed. The homogeneity ranges of the underlying phases were determined to be 0 <…
The dissolution of highly aggregated polyelectrolyte complex particles formed in water after addition of salt was studied. The dissolution of aggregates proceeded to soluble complexes on the molecular level of the long-chain component. The driving force of the process is the polyelectrolyte exchange reaction between t…
The behavior of surfactant−inorganic oxide−solvent systems is studied using lattice Monte Carlo simulations. Under no inorganic condensation conditions, these systems phase separate into a liquid crystal phase that contains mainly surfactant and inorganic oxide, in equilibrium with a solvent-rich phase. In the systems…
The expression of interleukin-1beta (IL-1beta) messenger RNA (mRNA) in macrophage-like cells cultured on phospholipid polymers was evaluated to determine the extent of the inflammatory response. As phospholipid polymers, poly(2-methacryloyloxyethyl phosphorylcholine(MPC)-co-n-butyl methacrylate(BMA)s (PMBs) were synth…
Highly luminescent CdTe quantum dots (QDs) were synthesised in a mixture of TOP and DDA. The growth of the particles in the reaction mixture was followed in time for three different temperatures. The reaction temperature determined the final diameter of the QDs (2.4 nm at 145 °C, 2.7 nm at 165 °C and 2.9 nm at 180 °C)…
Enzymes from psychrophilic organisms differ from their mesophilic counterparts in having a lower thermostability and a higher specific activity at low and moderate temperatures. It is in general accepted that psychrophilic enzymes are more flexible to allow easy accommodation and transformation of the substrates at lo…
Here we report the synthesis of dense arrays of Bi1-xSbx nanowires with >5 x 1010 nanowires/cm2. The individual wires are crystalline, relatively homogeneous, and highly textured in a 110 direction, with diameters of 40 nm and a composition of x = 12-15 atom % Sb. By tuning the solution concentrations and controlling…
A through-space superexchange mechanism appears to be responsible for charge recombination (CR) following photoexcitation and charge separation (CS) in rotaxanes containing zinc porphyrin and C60 moieties (see picture), as suggested by the low activation energy of this process. Furthermore, the charge-separated state…
Non-tetrahedron-forming L2 ligands insert into a resolved ΔΔΔΔ-[Ga4L16]12− tetrahedral assembly of labile metal and ligand components without compromising its supramolecular structure (see scheme). Preservation of the chirality of the initial architecture verifies its structural memory.
Gentle heating of crystalline 2,5-dibromo-3,4-ethylenedioxythiophene affords a highly conducting, bromine-doped poly(3,4-ethylenedioxythiophene) (PEDOT). The conductivity of the polymer can be further increased by doping with iodine. By using this approach, thin films of PEDOT with a conductivity as high as 20 S cm−1…
Vitrification of a supercooled liquid is often characterized by the hypothetical kinetic instability point, the Vogel-Fulcher temperature T0, and the thermodynamic one, the Kauzmann temperature T(K). The widely believed relation T0 congruent with T(K) is regarded as the supporting evidence of a direct connection betwe…
Excitons in quasi-one-dimensional semiconductors may lower the optical transition energies by a substantial amount. To quantify the effect in carbon nanotubes, we apply a simple variational approach. In excitonic units, a power law with exponent \ensuremath{\sim}-0.6 is obtained for the binding energy dependence on na…
Here we report an unconventional magnetic and transport phenomenon in a layered cobalt oxide ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}.$ Only for $x=0.75,$ a magnetic transition of the second order was clearly detected at ${T}_{m}\ensuremath{\sim}22\mathrm{K}$ where an apparent specific-heat jump, an onset of extremely sma…
The magnetic, transport, and structural properties of (Ga,Cr)As are reported. Zincblende Ga$_{1-x}$Cr$_{x}$As was grown by low-temperature molecular beam epitaxy (MBE). At low concentrations, x$\sim$0.1, the materials exhibit unusual magnetic properties associated with the random magnetism of the alloy. At low tempera…
We introduce a new linear response method to study the lattice dynamics of materials with strong correlations. It is based on a combination of dynamical mean field theory of strongly correlated electrons and the local density functional theory of electronic structure. We apply the method to study the phonon dispersion…