Materials Literature
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A series of recent studies have provided initial evidence about the role of specific intra-molecular interactions in maintaining proteins in their soluble state and in protecting them from aggregation. Here we show that the amino acid sequence of the protein monellin contains two aggregation-prone regions that are pre…
We generalize in this work the constitutive model for silicon crystals of Alexander and Haasen. Strain-rate and temperature dependency of the mechanical behavior of intrinsic crystals are correctly accounted for into stage I of hardening. We show that the steady-state of deformation in stage I is very well reproduced…
We report measurements of the nonlinear refractive index, n2, and the nonlinear absorption coefficient, α2, of Pb(PO3)2–WO3 glasses. The measurements were performed using 100 fs (17 ps) laser pulses at 800 nm (1064 nm). Positive values of n2∼10−19 m2/W and negligible α2 were measured. The results show that the nonline…
Abstract The effect of photopolymerization on the structure, stability and encapsulation properties of polydiacetylene micelles containing nitrilotriacetic acid head groups are investigated. Micellar nanostructures of 7–10 nm diameter are identified that are invariant after polymerization. In the micelles, the polymer…
The magnetic and microstructural properties of Zr-doped FePt/MgO and Cu-doped FePt-Zr/MgO nanocomposite films were investigated. The samples exhibited out-of-plane anisotropy after annealing for only 5 min and their grain growth was restrained by Zr doping. The Cu-doped FePt-Zr/MgO films showed an increased tendency t…
The new phosphate CsTi2(PO4)3 was synthesized by precipitating method and characterized by scanning electron microscopy with energy-dispersive X-ray microanalyzer, X-ray powder diffraction and IR-spectroscopy. The structure refinement of the phosphate was carried out by a Rietveld analysis. CsTi2(PO4)3 crystallizes wi…
Electron paramagnetic resonance (EPR) spectroscopy has been used to study energy transport properties of both bulk and nanophosphor (nominally 30 nm) oxyorthosilicate samples, and we were able to separate the effects of crystal disorder and relaxation lifetime broadening on the EPR linewidths. The low temperature line…
Zn(2+) in the tumor-suppressor protein p53 DNA-binding domain (DBD) is essential for its structural stability and DNA-binding specificity. Mg(2+) has also been recently reported to bind to the p53DBD and influence its DNA-binding activity. In this contribution, the binding geometry of Mg(2+) in the p53DBD and the mech…
Using in situ resistance measurements on diamond anvil cell, we have monitored the pressure and temperature dependence of the CaB6 electronic transport properties. We report that CaB6 is a semiconductor at room temperature and at ambient pressure, in contrast to previous studies suggesting a semimetal nature. From amb…
Abstract The working electrode of a Dye–sensitized Solar Cell (DSC) is a fluorine‐doped tin oxide (FTO) glass substrate pasted with nano‐porous TiO2. Under the illumination, dye molecules are excited and electrons are emitted. The electrons pass through two interfaces of dye/TiO2 and TiO2/FTO. Therefore, electron of t…
Based on semiempirical generalized embedded atom method (GEAM), we carried out molecular dynamics and Monte Carlo simulations to study the structural properties of FeCo and FeNi nanoparticles. It is found that these two kinds of nanoparticles possess a new stable quasicore-shell structure, no matter whether they are i…
In-plane photoconductivity (PC) measurements in a GaN/AlN quantum dots (QDs) layer show a TM-polarized infrared (IR) peak, at 0.9 eV, and a visible-UV (vis-UV) peak, at 2.8 eV. Based on the energy and polarization dependence, the 0.9 eV is associated with the polarized S to Pz intraband transition within the QDs. The…
An investigation of amorphous, pyrolytic carbon for semiconductor applications is presented. We have deposited conductive carbon films on thin silicon oxide and aluminum oxide dielectrics and structured them into metal-insulator-silicon (MIS) capacitors in order to evaluate their electrical properties. The results sho…
Water-dispersible PEGylated nanoparticles (NPs) presenting amine-reactive conjugation sites at their surfaces were synthesized and their ability to react with amines was demonstrated. An amphiphilic block copolymer bearing an N-succinimidyl ester at its water-soluble end was synthesized by the consecutive controlled r…
A recombinant DNA ligase from Sulfophobococcus zilligii that shows multiple cofactor specificity (ATP, ADP and GTP) was expressed in Escherichia coli and purified under reducing conditions. Crystals were obtained by the microbatch crystallization method at 295 K in a drop containing 1 µl protein solution (10 mg ml(-1)…
Abstract To understand the etching phenomenon or preferential etching in the GaN crystal that consisted of two elemental atoms, dry etchings were carried out using rare gases with a simple structure. n‐type GaN crystals were RF‐plasma‐etched with Ar, Kr, and Xe gases at various gas pressures and etching times. The etc…
Transient capacitance measurements reveal new physics of metastable defect formation in boron-doped oxygen-containing crystalline silicon solar cells. These measurements demonstrate that holes are deeply trapped during defect formation and removed during thermal annealing with activation energy of 1.3 eV. Previous the…
Individual monitoring of aircrew of airline operators registered in the Czech Republic has been performed since 1998. In this work, annual effective doses and annual collective effective doses of aircrew from occupational exposure in the period from 1998 to 2008 are presented, methods used for their evaluation and ver…
Application of polarization transfer techniques such as DEPT and INEPT in (29)Si NMR investigation of bridged silane polymerization requires knowledge of indirect (29)Si-(1)H scalar coupling constants in the silane system. However, the fully coupled (29)Si NMR spectra of these molecules, specifically those containing…
The influences of biaxial and uniaxial strain on the ultraviolet emission efficiencies of both c- and m-plane AlxGa1−xN films with different Al concentrations are investigated under the framework of k⋅p perturbation theory. The optimal high efficiency windows, for ultraviolet light emissions are quantitatively estimat…