Materials Literature
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Before a biomaterial can be applied in the clinic, biocompatibility must be tested in in vivo models, by monitoring the foreign body reaction. In this study, we compared the foreign body reaction (FBR) to the biodegradable biomaterial hexamethylenediisocyanate crosslinked dermal sheep collagen (HDSC) between several s…
Both cardiovascular implants and therapeutic interventions on native arteries fail due to biologic responses occurring at the blood/prosthesis/arterial wall and tissue/prosthesis/arterial wall interfaces, resulting in the failure modes of thrombosis and myointimal hyperplasia. Systemic pharmacologic approaches includi…
PbO, ZrO 2 , TiO 2 and Pb(Zr x Ti 1- x )O 3 (PZT) films were prepared by metalorganic chemical vapor deposition (MOCVD) using Pb(C 11 H 19 O 2 ) 2 , Zr(O·t-C 4 H 9 ) 4 , Ti(O·i-C 3 H 7 ) 4 and O 2 as source materials. The deposition rates of the constituent metals of Pb(Zr x Ti 1- x )O 3 (PZT) film were investigated a…
The general form of the X-ray susceptibility tensor near absorption edges is found when several anisotropic factors, such as the anisotropy of local atomic environment, magnetic ordering and orbital ordering, simultaneously exist in a crystal. Different phenomenological approaches are used to obtain the explicit form…
The structural development during the melt spinning and subsequent annealing of polybutene-1 fibers was studied with in situ wide-angle X-ray scattering techniques. The online spinning apparatus consisted of a vertically translating extruder that allowed different distances from the spinneret to the stationary X-ray b…
Pt–Ru nanoparticles (1.6 nm) were supported on carbon nanotubes (200 nm diameter, 8–10 µm length) obtained by the carbonisation of polypyrrole on an alumina membrane.
Recently, much interest has been generated by colloidal drug delivery systems such as nanocapsules because of the possibilities for controlled release, increased drug efficacy, and reduced toxicity after parenteral administration. Nanocapsules of poly-epsilon-caprolactone and Eudragit S90 were prepared. However, these…
Two bimetallic assemblies K[Cu(cyclam)][Fe(CN)6]·4H2O 1 and [Cu(L)][Cu(L1)][Fe(CN)6]·6.5H2O 2 (cyclam = 1,4,8,11-tetraazacyclotetradecane; L = N,N′-bis(2-pyridylmethylene)-1,3-propanediamine and L1 = N-2-pyridylmethylene-1,3-propanediamine) have been prepared from the reaction of [Fe(CN)6]3− and the precursors [Cu(cyc…
Alternate adsorption of anionic and cationic polyelectrolytes creates smooth organic films on the walls of template-grown Au nanowires, which can be made chemically reactive on their ends by removal of a sacrificial Ag layer.
Sterically hindered chiral (salen)manganese complexes bearing long perfluoroalkyl substituents are synthesized and successfully employed as catalysts in the enantioselective (ee = 50–87%) epoxidation of alkenes under fluorous biphasic conditions.
Key to the dynamics of the type of bubble collapse which is associated with such phenomena as sonoluminescence and the emission of strong rebound pressures into the liquid is the role of the liquid inertia. Following the initial formulation of the collapse of an empty spherical cavity, such collapses have been termed…
3,3′,4,4′-benzophenonetetracarboxylic dianhydride (4,4′-carbonyldiphathalic anhydride) was reacted with L-leucine in a mixture of acetic acid and pyridine (3 : 2), and the resulting imide-acid [N,N′-(4,4′-carbonyldiphthaloyl)-bis-L-leucine diacid] was obtained in quantitative yield. The compound was converted to the N…
The hydrothermal reactions of Cu2O, the appropriate polypyridine ligand, Na3VO4, H3PO4 and H2O at 200 °C yield the two-dimensional material [{Cu(bpy)}2(VO)3- (PO4)2(HPO4)2]·2H2 O and the one-dimensional phosphate [{Cu(terpy)}2(VO2)3(PO4 )(HPO4)2], examples of the structure-directing role of secondary metal–ligand subu…
We find that an ab initio electronic structure calculation in the Hartree-Fock approximation (HFA) leads to the experimentally observed magnetic and orbital orderings in ${\mathrm{LaMnO}}_{3},$ as well as its insulating character. While such agreement was also found in density-functional theories (DFT's), there are la…
Magnetic susceptibility measurements on a structurally characterized nickel(II) complex of a tridentate verdazyl radical indicate very strong ferromagnetic Ni–verdazyl intramolecular exchange interactions (J > +200 cm−1).
The thermodynamic and transport properties of the ${\mathrm{Er}}_{1\ensuremath{-}x}{\mathrm{Y}}_{x}{\mathrm{Co}}_{2}$ system were studied in the concentration range $0.0<~x<~1.0.$ In this system, the first-order magnetic phase transition observed in ${\mathrm{ErCo}}_{2}$ at ${T}_{\mathrm{C}}=32$ K is related to…
Equilibrium sedimentation studies show that the serine acetyltransferase (SAT) of Escherichia coli is a hexamer. The results of velocity sedimentation and quasi-elastic light scattering experiments suggest that the identical subunits are loosely packed and/or arranged in an ellipsoidal fashion. Chemical cross-linking…
Thermotropic discotic and smectic liquid crystallinity can be induced for folic acid derivatives having octadecyl and undecyl substituents in wide temperatures ranges, respectively; the addition of sodium triflate to smectic liquid-crystalline folic acid leads to a change of the assembled structures from smectic to co…
This study investigated the effects of high pressure processing (HPP) on the barrier properties of eight multilayer films. Pouches made from these films were filled with distilled water, sealed and then pressure processed at 600 and 800 MPa for 5, 10 and 20 min at 45°C. Controls were similarly prepared but exposed to…
A novel compound of the formula Ag2·CA (CA = cyanuric acid) possessing Ag sheets and hydrogen-bonded CA chains, exhibits anisotropic conductivity and acts as an infinite parallel plate capacitor with a high dielectric constant.