Materials Literature
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We have demonstrated reversible change in transmittance of composite films, which are composed of an isotropic (I) polymer matrix and a host nematic (N) liquid crystal (LC) containing donor–acceptor type azobenzene LCs (AzoLCs) as photoresponsive molecules, by means of reversible phase transition in the LC domain. The…
The influence of acrylonitrile during the grafting process of styrene onto pre-irradiated films of poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) and poly(tetrafluorothylene-alt-ethylene) (ETFE) was studied. The composition of the graft polymers was analysed with elementary analyses. A correlation between the…
The cytoplasmic protein-tyrosine kinase Fes has been implicated in cytokine signal transduction, hematopoiesis, and embryonic development. Previous work from our laboratory has shown that active Fes exists as a large oligomeric complex in vitro. However, when Fes is expressed in mammalian cells, its kinase activity is…
New experimental study of heavy ion and proton induced SEU at reduced voltage (i.e. reduced critical charge) reveals interesting results. It is shown that the heavy ion cross section and microprobe mapping scale like the threshold LET and the parameter, which is almost invariant under bias changes, is the effective ch…
The structure of tetrahedral amorphous carbon (ta-C) films deposited by a filtered cathodic vacuum arc has been studied using micro-Raman spectroscopy in terms of substrate bias, nitrogen gas partial pressure (ta-C:N films) or aluminum content in a mixed aluminum/carbon target (ta-C:Al films) during deposition. The fi…
Oxide/oxide microcomposites were fabricated and tested to evaluate the effectiveness of monazite (LaPO 4 ) and hibonite (CaAl 12 O 19 ) as interlayers in sapphire‐reinforced Al 2 O 3 ‐matrix composites. For interlayer thicknesses of 0.3‐0.5 µm, both interlayers showed evidence of crack deflection; however, debond leng…
Polymer layered silicate nanocomposites may be formed by annealing layered silicate particles with a polymer melt. Polymer molecules leave the bulk melt and intercalate between the silicate layers, producing a structure in which polymers are confined on the nanometer scale by the silicate layers. We report here molecu…
In this study we examined the mechanism of particle capture in Mytilus edulis, using radioactive-label clearance studies, progressive fixation, and scanning electron microscopy to visualize in detail the cirri and their range of motion. Confocal laser scanning microscopy was used to observe the interaction of cirri wi…
Newly discovered carbon nanotubes provide an environment in which small atoms move relatively freely. An assembly of such atoms provides a realization of a quasi-one-dimensional system which can be used to illustrate the concepts of statistical physics.
The time-dependent charging process of an insulating specimen under electron beam irradiation is calculated by taking into account the charge continuity equation, the Poisson equation, Ohm's law and the electron-beam-induced conductivity. The energy and the charge deposition distributions are calculated by the Monte C…
Wetting parameters e. g. contact angles, work of adhesion, fibre surface energy and interfacial energy of different flax and glass fibres in different liquids were determined. A polypropylene film was also studied by the Wilhelmy technique. The surface of the fibres was analysed with scanning electron microscopy. Resu…
The ring-opening polymerization of a novel heterocyclic monomer of the 1,4-dioxane 2,5-dione type, namely 3-(1,2-3,4-tetraoxobutyldiisopropylidene)dioxane-2,5-dione (DIPAGYL), derived from glycolic acid and partially protected gluconic acid, was investigated. Polymerization of DIPAGYL was carried out in the presence o…
Solutions of Co(3)(dpa)(4)Cl(2), where dpa = di(2-pyridyl)amide ion, in CD(2)Cl(2) were studied by NMR in the temperature range 183-303 K. The spectra show only four (1)H and five (13)C resonance signals, consistent with the D(4) symmetry of the molecules found in the solid. The magnetic susceptibility in solution was…
The need to grow high quality semiconducting hydrogenated amorphous carbon (a-C:H) thin films to allow n-type electronic doping by nitrogenation has lead us to deposit films with low paramagnetic defect density (1017 cm−3). The films were grown on the earthed electrode of a radio frequency driven plasma enhanced chemi…
The aluminium alkoxide mediated ring-opening polymerization of (di)lactones offers a great versatility to the point where the main situations covered by the definition of living and controlled polymerizations can be illustrated. Furthermore, substitution of a coordination-insertion mechanism for the traditional anioni…
Abstract Summary: ModBase is a database of evaluated and annotated comparative protein structure models. The database also includes fold assignments and alignments on which the models were based. Availability: ModBase is accessible on the Web at http://guitar.rockefeller.edu/modbase. Models for yeast proteins are also…
Ferromagnetic and antiferromagnetic alternating interactions within and between chains, respectively, were interpreted for a one-dimensional coordination polymer having high-spin (S = 5/2) MnII centers bridged by azido ligands, namely, [Mn(bpm)(N3)2]n (bpm = bis(pyrazol-1-yl) methane).
The adsorption of the cationic dye rhodamine 3B in the clay hectorite is studied using electronic absorption and fluorescence emission spectroscopy. The results show the presence of various dye monomers, dimers, and higher aggregates and their interconversion subject to variations in loadings and stirring times. The g…
Oxidation of the non-mesomorphic ferrocene derivative 1 with silver toluene-4-sulfonate gave the ferrocenium derivative 2, which showed a monotropic columnar phase. The latter two-dimensional phase is composed of ribbons, in which derivative 2 is organized into bilayers, and has a centered rectangular symmetry with a…
Solutions of the poly(propylene imine) dendrimers DAB- dendr -(PA) 32 and DAB- dendr -(PA) 64 in methanol are investigated with small angle neutron scattering over the range of dendrimer mass fraction 0.01 ≤ x ≤ 0.80. The single particle scattering function, P ( q ), is used to calculate the structure factor, S ( q ),…