Materials Literature
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The tetraacetates of α- and β-methylglycosides of d -glucose were reacted with dibutyltin dimethoxide in hot toluene with elimination of methyl acetate. The stannylenated glucose derivatives having a five- and six-membered tin-containing ring were isolated in a crystalline form. The soluble α-glycoside was used as cyc…
A series of monodisperse poly(styrene -b- isoprene[ -g- perfluoroacyl]) block copolymers was synthesized by sequential anionic polymerization of styrene and isoprene. The perfluorinated ester side chains were attached to the remaining double bonds of the isoprene block via oxidative hydroboration and esterification of…
The conformational transition behavior around the glass transition temperature has been studied by means of molecular dynamics through a model system, atactic polypropylene in bulk. Various criteria of the conformational transition were examined. A domain at barrier site is defined as the transition state of the confo…
Molecular dynamics via broad-band dielectric relaxation spectroscopy (DRS) are obtained on a class 3 network-forming system: a generic cyanate ester resin. The potential for in-situ monitoring of the network-forming reaction is explored. The segmental dynamics of the growing network are investigated, and a hitherto un…
The effect of solid−liquid interfacial energy on the long-range attraction between self-assembled thiolate monolayers in water has been studied by direct force measurements. The solid−liquid interfacial energy was tuned by changing the properties of the solid surface: the thiolate monolayers were prepared by self-asse…
status: Published
Gluten films were prepared by casting an acidic and ethanolic solution of gluten previously treated with sodium sulfite. The effects of sulfitolysis on proteins were investigated by SE-HPLC and thiol/disulfide content measurements. During sulfitolysis, insoluble glutenin macropolymer was converted into its constitutiv…
The mechanism of the order−order transition in a block copolymer between spheres in a body-centered cubic lattice (bcc-spheres) and hexagonal cylinders was investigated by means of small-angle X-ray scattering (SAXS). The block copolymer studied is a polystyrene- block -polyisoprene diblock copolymer having a molecula…
Bulky bis(phenolate) complexes of titanium alcoholates were found to initiate living polymerization of ε-caprolactone, affording a polyester with a narrow molecular weight distribution. By changing the initial monomer-to-initiator mole ratio, the molecular weight of the polymer was controlled over a wide range. 1 H NM…
A comprehensive investigation of the reorientational dynamics of poly(vinylidene fluoride)/poly(methyl methacrylate) (PVDF/PMMA) blends was carried out. Dielectric relaxation spectroscopy (DRS) was performed over 11 decades of frequency and over a wide range of temperature on wholly amorphous, crystalline, and crystal…
Within the last five years, investigators using NMR and forced Raleigh scattering techniques have found that the Stokes–Einstein (S–E) relation breaks down in supercooled liquids. It has been pointed out that the shear viscosity has a significantly stronger temperature dependence than either the self-diffusion coeffic…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPhotocatalytically Deposited Silver Nanoparticles on Mesoporous TiO2 FilmsElias Stathatos, Panagiotis Lianos, Polykarpos Falaras, and A. SiokouView Author Information Engineering Science Department, University of Patras, 26500 Patras, Greece Institute of Physical Chemistry, NCS…
The oxidative modification of methionines within the primary sequence of calmodulin (CaM) results in an inability to activate the PM-Ca-ATPase fully, and may contribute to alterations in calcium homeostasis under conditions of oxidative stress. To identify differences in the sensitivities of CaM isoforms to oxidative…
Escherichia coli CsdB, a NifS homologue with a high specificity for L-selenocysteine, is a pyridoxal 5'-phosphate (PLP)-dependent dimeric enzyme that belongs to aminotransferases class V in fold-type I of PLP enzymes and catalyzes the decomposition of L-selenocysteine into selenium and L-alanine. The crystal structure…
The condensation polymerization in a methanol solution of four different esterified aldaric acids (D-glucaric, meso-xylaric, meso-galactaric, and D-mannaric) with even-numbered alkylenediamines (C2–C12) gave polyhydroxypolyamides whose water solubilities and melting points were compared. In general, an increase in the…
The surfaces of standard untreated polystyrene cell culture dishes have been oxidatively modified for up to 8 min exposure time using an ultraviolet ozone treater in order to promote cell adhesion. Surface oxygen chemisorption and topographical modification has been characterized using monochromatic X-ray photoelectro…
Two-dimensional X-ray diffraction (XRD) analyses of transparent mesoscopically ordered silica/block copolymer composite monoliths reveal single-crystal-like patterns that correspond to well-ordered hexagonal domains that are greater than 1 cm × 1 mm × 1 mm in size. Analyses of the diffraction patterns reveal highly un…
We propose a new method to calculate expectation values of a delta function of the Hamiltonian, < Ψ\mid δ(\hat{H} - E)\mid Ψ>. Since the delta function can be replaced with a Gaussian function, we evaluate < Ψ\mid \sqrt{\fracβπ} e^{-β(\hat{H} - E)^2} \mid Ψ> with large βadopting the Suzuki-Trotter decomposition. Error…
We present results of computer simulations of amorphous Si3B3N7 ceramics. The computed pair correlation functions are in agreement with the experimental results. Regarding the structural properties of the B-N, Si-N and N-Si/B coordination spheres, our results are in full agreement with experimental data. We confirm th…
A doubly N-confused porphyrin (N 2 CP), 2-ethoxy-5,10,15,20-tetrapentafluorophenyl-3,7-diaza-21,22-dicarbaporphyrin, and its Ag(III) and Cu(III) complexes were synthesized for the first time, via an acid-catalyzed condensation of pentafluorobenzaldehyde and meso -pentafluorophenyl-2,3‘-dipyrromethane. 1 H NMR and sing…