Materials Literature
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Applying random walk simulations we analyze results of one- (1D) and two-dimensional (2D) H2 nuclear magnetic resonance (NMR) experiments carried out to study the slow β process of toluene-d5 below the glass transition temperature Tg. In this way, we reveal amplitude and mechanism of rotational jumps involved in the s…
Bismuth doped yttrium niobate (YNbO4:Bi) is a potential blue phosphor for field emission displays application. It is observed after introducing Bi ions that cathodoluminescence efficiency of YNbO4:Bi becomes lower than that of YNbO4. From the calculations of critical distance (RC) of energy transfer and Huang–Rhys par…
Isothermal titration calorimetry and X-ray crystallography have been used to determine the structural and thermodynamic consequences associated with constraining the pTyr residue of the pYEEI ligand for the Src Homology 2 domain of the Src kinase (Src SH2 domain). The conformationally constrained peptide mimics that w…
The morphological change of p-type porous silicon during annealing has been investigated. The x-ray diffraction (XRD) pattern was composed of a sharp Bragg reflection peak and a diffuse scattering. The diffuse scattering is not related to the presence of the amorphous phase. The shape of the XRD pattern started to cha…
Serine hydroxymethyltransferase (SHMT) is a member of the fold type I family of vitamin B6-dependent enzymes, a group of evolutionarily related proteins that share the same overall fold. The reaction catalysed by SHMT, the transfer of Cbeta of serine to tetrahydropteroylglutamate (H4PteGlu), represents in the cell an…
The dynamics of the photochemical phase transition process of guest/host liquid crystals (LCs) containing an azobenzene derivative as a photosensitive chromophore was studied. We proposed a model for the photochemical phase transition of the guest/host LCs and simulated the change in transmittance through LCs due to t…
Broadband and fluorescence line narrowing optical spectroscopic studies have been used to investigate the local environments of Eu3+ ions in lithium fluoroborate glasses. From the vibronic spectra, different borate groups coupled with the Eu3+ ions have been identified. A pulsed tunable dye laser has been used to sele…
The spinning mechanism of natural silk has been an open issue. In this study, both the conformation transition from random coil to beta sheet and the beta sheet aggregation growth of silk fibroin are identified in the B. mori regenerated silk fibroin aqueous solution by circular dichroism (CD) spectroscopy. A nucleati…
We report a detailed study of ac/dc magnetization and longitudinal/transverse transport properties of La1.2Sr1.8Mn2O7 single crystals below Tc=118 K. We find that the resistivity minimum at 40 K is related to the reentrant spin glass phase at the same temperature, accompanied by additional anomalous Hall effects. The…
We have functionalized single walled carbon nanotubes (SWNTs) with atomic hydrogen generated in a cold plasma. A band at 2924 cm -1 (3.4 μm), characteristic of the C−H stretching mode, is observed using Fourier transform infrared spectroscopy. Additional confirmation of functionalization is provided by irradiating wit…
A series of YBa_{2-x}Sr_xCu_4O_8 single crystals was measured to study the influence of site disorder on the transition line Hss(T) between quasi-ordered vortex lattice and highly disordered vortex glass, as well as on the maximum critical current density within the glass phase, jcmax. When 32% of Ba is replaced by Sr…
Valence electron-energy loss spectroscopy (VEELS) in a dedicated scanning transmission electron microscope, vacuum ultraviolet spectroscopy and spectroscopic ellipsometry, and ab initio band structure calculations in the local density approximation have been used to determine the optical properties and the electronic…
Crystals of the title compound, (NH4)4[H6NiMo6O24]·4H2O containing the well known B-type Anderson–Evans heteropolyoxometalate, were obtained by recrystallization of powder (NH4)4[H6NiMo6O24]·nH2O. The anion has the Ni atom at an inversion center and has close to \overline 3m symmetry, with Ni—O bond lengths in the ra…
We present a detailed theoretical study, based on density-functional calculations, of Na adsorption on ${\mathrm{TiO}}_{2}(110)$ for coverage equal to 1/8, 1/4, and 1/2 monolayers. Two competing threefold adsorption sites are found. In the framework of the Bader theory, we analyze the electron distribution, the interf…
The tricalcium dimanganese heptaoxide (Ca3Mn2O7) member of the Ruddlesden-Popper series Ca(n+1)Mn(n)O(3n+1), i.e. with n = 2, was previously reported with an I-centred tetragonal lattice [a(t) = 3.68 and c(t) = 19.57 A] by Fawcett, Sunstrom, Greenblatt, Croft & Ramanujachary [Chem. Mater. (1998), 10, 3643-3651]. It is…
BACKGROUND: Tryptophan synthase consists of two subunits, alpha and beta. Two distinct subgroups of beta chain exist. The major group (TrpEb_1) includes the well-studied beta chain of Salmonella typhimurium. The minor group of beta chain (TrpEb_2) is most frequently found in the Archaea. Most of the amino-acid residue…
This work is a contribution to better knowledge of the influence of the structure of films on their functional properties obtained from emulsions based on arabinoxylans, hydrogenated palm kernel oil (HPKO), and emulsifiers. The sucroesters (emulsifiers) have a great effect on the stabilization of the emulsified film s…
The application of ultrasound for the treatment of polychlorinated biphenyl (PCB) contaminated sediments was explored in this study with a model system of 4-chlorobiphenyl (4-CB) and synthetic sediments. In the presence of an ultrasonic probe, operating at 20 kHz with a power density of 460 W L(-1), more than 90% of 4…
Syndiotactic polystyrene (sPS) glassy sample crystallizes into the polymer−solvent complex of δ form with T 2 G 2 helical conformation when it is exposed to the atmosphere of organic solvent. This solvent-induced crystallization is observed at room temperature, much lower than the glass transition temperature of sPS.…
Succinyl-CoA synthetase catalyzes the reversible reaction succinyl-CoA + NDP + P(i) <--> succinate + CoA + NTP (N denoting adenosine or guanosine). The enzyme consists of two different subunits, designated alpha and beta. During the reaction, a histidine residue of the alpha-subunit is transiently phosphorylated. This…