Materials Literature
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Synthesis and characterization of new nanocomposites of and a sulfonated, alkylated polyaniline derivative [poly( N ‐propane sulfonic acid aniline), PSPAN] are described. Two types of nanocomposites have been produced, one by reaction of vanadium triisopropoxide solutions with N ‐propane sulfonic acid aniline and one…
The ignition and pyrolysis of some copolymers of methyl methacrylate (MMA) with diethyl(methacryloyloxymethyl)phosphonate (DEMMP) have been studied by a simple tube furnace and by isothermal and non-isothermal TGA. The results indicate that copolymers containing DEMMP thermally degrade, under both air and nitrogen, by…
Fluorinated and chlorofluorinated polyimides with high thermal stability and low optical absorption loss in the optical communication wavelengths of 1.3 and 1.55 μm were investigated for low-loss passive waveguide applications. These polyimides were prepared from pyromellitic dianhydride (PMDA) with 1,4-bis-[4-amino-2…
Rhodococcus sp. NCIMB112038 can utilize naphthalene as its sole carbon and energy source. The gene encoding cis-naphthalene dihydrodiol dehydrogenase (narB) of this strain has been cloned and sequenced. Expression of NCIMB12038 cis-naphthalene dihydrodiol dehydrogenase was demonstrated in Escherichia coli cells. narB…
Amphiphilic poly(ether ester amide) (PEEA) multiblock copolymers were synthesized by polycondensation in the melt from hydrophilic poly(ethylene glycol) (PEG), 1,4-dihydroxybutane and short bisester-bisamide blocks. These amide blocks were prepared by reaction of 1,4-diaminobutane with dimethyl adipate in the melt. A…
Sixteen glycosides of pregnanes, including ikemagenin, lineolon, and a new pregnane, 3beta8beta,14beta,15beta,16alpha-pentahydroxy-++ +5alpha-pregnan-20-one, termed pleurogenin, were isolated from the roots of Asclepias tuberosa. Among ikemagenin and lineolon glycosides, one (1) was a known glycoside, and eight (2-7,…
We have observed a drastic change in the properties of indium oxide (In2O3) thin films prepared by pulsed laser deposition in a pure helium (He) background gas on unheated glass substrates. At high He pressures above 1.0 Torr, transparent crystalline In2O3 films could be prepared, even though the deposition was carrie…
This review deals with the current status of newly developed pendant-type PEG-immunoliposomes (Type C), carrying monoclonal antibodies or their fragments (Fab') at the distal ends of the PEG chains. In terms of target binding of Type C, two different anatomical compartments are considered. They are mouse lung endothel…
In this study, two different viscosity-average molecular weight (eta = 4.0 and 7.8) poly(L-lactide) (PLLA) were synthesized by ring-opening polymerization and the poly(L-lactide)/hydroxyapatite composites (PLLA/HA) were prepared by blending HA particles (size range: 25-45 microm and Ca/P = 1.69) with a content of 10,…
Silicon imido nitride with a specific surface area up to 1000 m2 g−1 is obtained by ammonolysis of silicon tetrachloride in organic solvents and subsequent NH4Cl removal at elevated temperatures in a stream of anhydrous ammonia. The material has a remarkably narrow pore size distribution and a mean pore size of 5.7 nm…
Perrhenic acid in combination with tertiary arsines gives a versatile catalytic system for epoxidation of alkenes with hydrogen peroxide. The best results are obtained with diphenylmethylarsine. A wide range of alkenes could be epoxidised with aqueous hydrogen peroxide (60%) in 60–100% yields with substrate to catalys…
A previously described automated thin-film deposition system based on rf-magnetron sputtering could deposit quite complex optical multilayer systems with good precision and with no one in attendance [Sullivan and Dobrowolski, Appl. Opt. 32, 2351-2360 (1993)]. However, the deposition rate was slow, and the uniform area…
An Fe ion-exchanged BEA zeolite (Fe-BEA), which effectively performs selective catalytic reduction of N2O with methane in the presence of excess oxygen, is much more active than Fe-MFI zeolite reported in the literature.
Incorporation of germanium into a zeolite framework allows the synthesis of Ti-Ge-ITQ-7 without seeding in <12 h, instead of 12 days when seeding or >40 days without seeding for the Ge-free ITQ-7; the synthesis reported also increases the efficiency of Ti incorporation and allows the preparation of almost nanocrystali…
Noncovalent assembly of ZnII–mesoporphyrin IX was accomplished by coordination to α-helical peptides (4–64 segments) based on polyamideamine dendrimer; the electron transfer functions were expressed more effectively with the growth of the dendrimer generation.
The transparent hybrid material, HLP/SiO2, was prepared by an in situ sol–gel process of tetraethoxysilane (TEOS) at 30°C in the presence of hydroxy-containing linear polyester (HLP) obtained by ring-opening reaction of diglycidyl ether of bisphenol A (DGEBA) with adipic acid under the catalyzation of triphenylphosphi…
Highly anisotropic CoPt and FePt nanoparticles have been prepared and embedded in a C and BN matrices using the tandem deposition mode. The as-made multilayer CoPt(FePt)/C(BN) films show a disordered face centered cubic (fcc) structure, which is magnetically soft and have low coercivity (10/sup 7/ erg/cm/sup 3/. The c…
Many biophysical experiments depend on large amounts of pure, soluble protein. Indeed, the revolution in structural biology has depended on molecular biology's potential to make experiments possible by allowing the overexpression of normally rare proteins in a heterologous host. All too often, however, overexpressed p…
Reaction of (NH4)2MoS4 and (NH2OH)2·H2SO4 under hydrothermal conditions led to the new compound (NH3- OH)3.9MoS4.8 I, which crystallises from acetone solution producing hollow tubules of nanoscopic size (50–500 nm diameter, 0.1–20 μm length); thermal decomposition of I led to the formation of highly dispersed tubular…
Vegetable fibers like cotton, sisal, and sugar cane bagasse have been used as reinforcement in a polymeric matrix. Because of its low cost and affinity with lignocellulosic fibers, a phenol-formaldehyde resin —resol— was selected as the matrix. Composites were prepared by compression molding. The influence of fiber vo…