Materials Literature
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The room-temperature resonance Raman (RR) spectra of nickel(II) porphine have been simulated for excitation within the Q-band optical transition, taking into account both coordinate-independent (Condon) as well as coordinate-dependent (non-Condon) contributions to the Raman scattering amplitude of each vibration. Comp…
A latex of poly(β-hydroxyoctanoate) was obtained from Pseudomonas oleovorans grown at high cell density on sodium octanoate. A fermentation using a pH-stat control of octanoate concentration as well as the purification steps using sodium hypochlorite were described. It was observed that latex stabilization occurred sp…
We have prepared and characterized a mesoporous material where the framework, of both the as-synthesized and calcined materials, is composed of ZrO 2 -doped 25-Å TiO 2 anatase crystallites. The nanocrystalline framework is structured about a surfactant-templated, disordered porous network with a uniform pore diameter…
Low-dimensional metals exhibit a wealth of interesting phenomena associated with the special topology of their Fermi surfaces. These Fermi surfaces contain a very rich information concerning not only the dimensionality of the conductivity but also the possibility of different metal-to-insulator or metal-to-metal trans…
The syntheses and characterization of [2,3,7,8,12,13,17,18-octafluoro-5,10,15,20-tetraphenylporphinato]cobalt, Co(F(8)TPP), and [2,3,7,8,12,13,17,18-octafluoro-5,10,15,20-tetrakis(pentafluorophenyl)porphinato]cobalt, Co(F(28)TPP), are reported. Co(F(28)TPP).2tol (tol = toluene) crystallizes in the monoclinic space gro…
Polymer blends incorporating poly (ethylene terephthalate) (PET), polyamide-6 (PA-6), and a reactive compatibilizer (low molecular weight bisphenol-A epoxy resin—E-44) were prepared with the following E-44 weight percent concentrations: 0, 0.3, 0.6, 1, 3, 5, and 10. The samples was studied by a scanning electron micro…
A hybrid layered compound [{K(18-cr)(2-PrOH)(2)}{Mn(acacen)}(2){Fe(CN)(6)}] has been prepared by the reaction of [Mn(acacen)(Cl)] with [K(18-cr)(H(2)O)(2)](3)[Fe(CN)(6)].3H(2)O in an ethanol/2-propanol mixed solvent (18-cr = 18-crown-6-ether, acacen = N,N'-ethylenebis(acetylacetonylideneiminate)). It crystallizes in t…
Detailed bulk magnetization and magnetic susceptibility measurements are reported for representative examples of the series of ferrimagnetic tris-oxalato-ferrate(II,III) salts with general formula AFe II Fe III (C 2 O 4 ) 3 (A = quaternary ammonium, phosphonium, or arsonium). The compounds all crystallize in two-dimen…
The solution structure of Abeta(1-40)Met(O), the methionine-oxidized form of amyloid beta-peptide Abeta(1-40), has been investigated by CD and NMR spectroscopy. Oxidation of Met35 may have implications in the aetiology of Alzheimer's disease. Circular dichroism experiments showed that whereas Abeta(1-40) and Abeta(1-4…
The effects of antifoam on the control of foam formation during the demineralization of crab shell in the preparation of chitin were evaluated. Foam formation was markedly controlled by addition of antifoam and decreased with increasing antifoam concentrations. At 1.00 mL of antifoam/L of 1 N HCl, the performance of a…
The many A 5 B 3 phases that exhibit hexagonal Mn 5 Si 3 -type structures by and large have a nearly unique abilities to bind diverse heteratoms Z in a preformed cavity within a chain of confacial trigonal antiprisms of A. The historical development of this chemistry as interstitially stabilized Nowotny phases and rec…
A new poly(ester amide) derived from L-alanine has been synthesized and characterized. The polymer has good fiber- and film-forming properties, as well as other characteristics like thermal stability and solubility in chloroform, which enhance its processing facilities. Degradation studies show that both pH and temper…
Xylan with glucuronic acid functionalities, separated from birchwood, was converted into hydrogels by dissolving it together with chitosan in acidic conditions. The hydrogels were formed at certain xylan/chitosan compositions. The mechanism of the gel formation was investigated with FTIR. Complexation between glucuron…
The regulation of Escherichia coli glutamine synthetase (GS) by reversible adenylylation has provided one of the classical paradigms for signal transduction by cyclic cascades. Yet, many mechanistic features of this regulation remain to be elucidated. We examined the regulation of GS adenylylation state in a reconstit…
In this article, silicone rubber/organomontmorillonite hybrid nanocomposites were prepared via a melt-intercalation process. The resulting hybrid nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results proved that the organ…
We propose two statistical models for description the metal-insulator phase transition coupled with paramagnetic-ferromagnetic phase transition in manganites of the type La_{1-x}Sr_xMnO_3. The first one based on the competition of small polarons and delocalized carriers. In the second one the conductivity appears as a…
Polyurethanes (PUs) of a suitable molar ratio of monomers were found to have shape-memory behavior. In this study, four series of PUs were synthesized by 4,4′-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BD), and various molecular weights of poly(tetramethylene oxide)glycol (PTMO) to study the influence of the…
Micelles formed from polycaprolactone-b-poly(ethylene oxide) (PCL-b-PEO) diblock copolymers were investigated as a novel drug delivery system. The affinity of the micelles for hydrophobic solubilizates was assayed by determining the partition coefficient for the lipophilic compound, pyrene, between the micelles and wa…
Shape-memory polyurethanes (PUs) were synthesized by 4,4′-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BD), and poly(tetramethyl oxide)glycol (PTMO). The morphology of PUs was studied using DSC, DMA, and TEM. The results indicated that the PUs would show different morphology by changing the mol ratio of MDI and…
Ozone decomposition was investigated under reaction conditions by using Raman spectroscopy on a supported manganese oxide catalyst. An adsorbed species with a Raman signal at 884 cm - 1 was observed during reaction, and was identified as a peroxide species by a combination of in situ Raman spectroscopy and 18 O isotop…