Materials Literature
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Magnetic luminescent nanocomposites were prepared via a layer-by-layer (LbL) assembly approach. The Fe 3 O 4 magnetic nanoparticles of 8.5 nm were used as a template for the deposition of the CdTe quantum dots (QDs)/polyelectrolyte (PE) multilayers. The number of polyelectrolyte multilayers separating the nanoparticle…
Abstract The methods for multiphase stability determination are generally based on Gibbs free energy minimization. However, a novel and efficient method is proposed in this work for one‐, two‐, and particularly three‐liquid‐phase stability identification in ternary mixtures. The method is designated the extended gener…
Biochemical, luminescence and mass spectroscopy approaches indicate that Trp-151 (helix V) plays an important role in hydrophobic stacking with the galactopyranosyl ring of substrate and that Glu-269 (helix VIII) is essential for substrate affinity and specificity. The x-ray structure of the lactose permease (LacY) wi…
A new ferrimagnetic oxide of stoichiometry YFeMnO 5 has been prepared in polycrystalline form by wet-chemistry procedures followed by thermal treatments under high oxygen pressure conditions. This material has been characterized by X-ray and neutron powder diffraction (NPD), magnetotransport, specific heat, and magnet…
The effects of heat treatment temperature, HTT, on the tensile strength (u) of PAN-based carbon-fiber-reinforced carbon matrix composites (C–Cs) were examined. In order to understand the mechanisms yielding variation of the tensile strength, the distribution of fiber strength and the interfacial strength between the f…
A number of AraC family transcriptional activators bind low-molecular-weight ligands that modulate the activity of these proteins. Recently, it has become clear that the activity of several virulence-related AraC family members is regulated through the direct interaction of protein ligands. These interactions, in gene…
Three new heterospin complexes derived from trans-oxamido-bridged copper(II) binuclear units [Cu(2)(oxen), oxen = N,N-bis(2-aminoethyl)oxamide] and pyridine-substituted nitronyl nitroxides (o-, m-, and p-PYNN) were synthesized and characterized structurally and magnetically. Complexes 1 and 2 are four-spin complexes.…
The melting behavior of nanostructured organic materials (drugs) embedded into a cross-linked polymeric matrix was studied for the first time. The complex microstructure of these nanocomposites, yielded by the polymer matrix in which molecular clusters and nanocrystals of drug plus a cospiquous fraction of water are c…
Beta-1,4-galactosyltransferase (beta4Gal-T1) in the presence of manganese ion transfers galactose from UDP-galactose (UDP-Gal) to N-acetylglucosamine (GlcNAc) that is either free or linked to an oligosaccharide. Crystallographic studies on bovine beta4Gal-T1 have shown that the primary metal binding site is located in…
Abstract Spray drying a mixture of silica and polystyrene latex (PSL) colloids above the decomposition temperature of PSL results in the formation of porous silica particles. By appropriate selection of the experimental conditions, such as the use of a tubular temperature, the weight fraction of colloids, and the flow…
The haloacid dehalogenase (HAD) superfamily is comprised of structurally homologous enzymes that share several conserved sequence motifs (loops I-IV) in their active site. The majority of HAD members are phosphohydrolases and may be divided into three subclasses depending on domain organization. In classes I and II, a…
Metastabil bis zu 280 K: {MoVCuICuII5} (S=3) wird bei Lichtanregung durch intramolekularen Elektronentransfer vom MoIV-Zentrum zu einem der CuII-Termini von [MoIV(CN)2(CN-CuII(L))6]8+ (1; L=Tris(2-aminoethyl)amin) gebildet (siehe Bild: Mo gelb; C schwarz; N hellblau; Cu dunkelblau). Dieser Prozess ist thermisch revers…
A nitronyl-nitroxide (NIT) biradical D-NIT2 linked by a single double bond has been engineered and investigated in the solid state by a combination of X-ray diffraction, magnetic susceptibility measurement, EPR, as well as solid-state (1)H and (13)C NMR spectroscopies, and experimental electron density distribution. A…
The influence of a chiral gelator molecule, N, N ‘, N ‘ ‘ -tris-( S )-(3,7-dimethyloctyl)benzene-1,3,5-tricarboxamide (( S )DO 3 B), on the structure in the formation of supramolecular polymers and viscoelasticity was examined in an organogel system consisting of a racemic mixture of the gelator molecule, N, N ‘, N ‘…
The mechanisms controlling the reduction of cobalt and the growth of metallic cobalt clusters in Co-MCM-41 catalysts at different stages in the process of single-wall carbon nanotubes (SWNT) synthesis were investigated both by in-situ and ex-situ X-ray absorption spectroscopy. We have found that prereduction of the ca…
We present a high-resolution study of the isotropic to nematic phase transition of a low birefringence liquid-crystal compound incorporating an aerosil gel. Calorimetry, light scattering, and microscopy data coherently combine to allow for an accurate determination of the temperature dependence of the onset of the nem…
The contact angle of a drop in equilibrium on a solid is strongly affected by the roughness of the surface on which it rests. We study the roughness–induced enhancement of the hydrophobic or hydrophilic properties of a solid surface through homogenization theory. By relying on a variational formulation of the problem,…
A nonlinear optical technique--second harmonic generation (SHG)--has been applied to characterize the adsorption of poly-L-lysine on micrometer size polystyrene particles, whose surface is covered with negatively charged sulfonate groups, in aqueous solutions. Adsorption behavior of the biopolymer with two chain lengt…
The detection of sialic acid in living systems is of importance for the diagnosis of several types of malignancy. We have designed and synthesized two new lanthanide ion ligands (L1 and L2) that are capable of molecular recognition of sialic acid residues. The basic structure of these ligands consists of a DTPA-bisami…
Exploiting the effect of surface-enhanced Raman scattering (SERS), the Raman signal of single-wall carbon nanotubes (SWNTs) can be enhanced by up to 14 orders of magnitude when the tubes are in contact with silver or gold nanostructures and Raman scattering takes place predominantly in the enhanced local optical field…