Materials Literature
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The synthesis of planar arrays of metal nanoparticles is an important goal in nanotechnology. As shown in the picture, superlattices of gold nanoparticles are readily assembled by biomolecular templating using bacterial S-layer membranes. Only nanoparticles of certain size and charge are organized in regular patterns,…
Silberdoppelsalze mit eingeschlossenen Carbidionen wurden mit [15]Krone-5 (15C5) als Strukturdirektor hergestellt. Die Dimensionalität der Verbindungen ist ausgesprochen niedrig; es handelt sich entweder um diskrete Moleküle oder Zickzack-Ketten. Sie enthalten verschiedenartige Silberkäfige, die sandwichartig durch η5…
The order-disorder phase transitions of ${\mathrm{KNO}}_{2},$ ${\mathrm{CsNO}}_{2},$ and ${\mathrm{TlNO}}_{2}$ have been studied using parameter-free molecular dynamics simulation. It is found that the phase transitions in nitrites investigated are driven by the rotations of the ${\mathrm{NO}}_{2}^{\ensuremath{-}}$ io…
Abstract A new family of porous fluorinated membranes was developed from perfluoropolyethers (PFPEs). The PFFE–dimethacrylate (3) was dispersed in isopropanol to form a clear homogeneous solution, which after UV curing in polypropylene molds formed a porous polymer disk. A series of 10 polymers was prepared with ratio…
Abstract A cationic poly(methyl iodide quaternized styrene– N , N ‐dimethylaminopropylmaleamidic acid) copolymer was synthesized through amidoacidification reaction of styrene‐maleic anhydride copolymer with N , N ‐dimethylaminopropylamine (ring‐opening reaction). Its properties in various aqueous salt solutions and p…
Abstract Cotton fibers treated with liquid ammonia and sodium hydroxide were hydrolyzed with crude cellulase. The structural change in the fibers due to the cellulase treatment was examined in relation to the apparent affinity of Congo Red. The cellulose III crystalline structure collapsed and generated intermediate‐m…
In this paper, we examine the wet-air oxidation (WAO) of four nuclear-fuel-chelating compounds [diethylenetriaminepentaacetic acid (DTPA), ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and thenoyltrifluoroacetone (TTA)]. The study focuses on the kinetics and mechanism of the degradation process.…
Abstract The morphologies of poly(ϵ‐caprolactone) (PCL) blends with hydroxyethyl cellulose acetate (HECA), a thermotropic liquid crystalline polymer (TLCP), were investigated by optical microscopy. It is demonstrated that when the pure PCL is crystallized from the melt, a spherulitic morphology arises with distinct Ma…
Abstract Eight kinds of self‐catalyzed poly( ortho ‐esters) (POEs) are used to fabricate bovine serum albumin (BSA)‐containing microspheres using a W/O/W double‐emulsion solvent extraction/evaporation method. All eight kinds of POE polymers used in this study are shown able to form microspheres under proposed fabricat…
Abstract High‐speed spinning of poly(ethylene terephthalate) with an intrinsic viscosity of 0.98 dL/g was performed at a take‐up velocity of 2.5–5.5 km/min, and the effects of the fiber structure on the isothermal and nonisothermal shrinkage‐stress evolution in as‐spun filaments were investigated. In isothermal measur…
Abstract Semi‐interpenetrating polymer networks (SIPNs) composed of silk fibroin (SF) and a poly(ethylene glycol) (PEG) diacrylate macromer were synthesized and characterized. The conformation of SF in SIPNs was changed from a random coil to a β‐sheet structure by formation of SIPNs with PEG, while the crystalline str…
Isocitrate dehydrogenase (IDH) catalyzes the oxidative decarboxylation of isocitrate and has negligible activity toward other (R)-malate-type substrates. The S113E mutant of IDH significantly improves its ability to utilize isopropylmalate as a substrate and switches the substrate specificity (k(cat)/K(M)) from isocit…
The crystal and microstructures of the novel microfibrillar poly(vinyl alcohol) fibers (PVA fibrils) having different syndiotactic diad (S-diad) contents of 56−65% have been investigated by small- and wide-angle X-ray methods. The PVA fibrils were directly prepared from the saponification and in-situ fibrillation with…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMagnetic Excitations of CsMn(SO4)2·12D2O, Measured by Inelastic Neutron ScatteringReto Basler, Philip L. W. Tregenna-Piggott, Hanspeter Andres, Christopher Dobe, Hans-Ulrich Güdel, Stefan Janssen, and Garry J. McIntyreView Author Information Department of Chemistry and…
New poly(beta-hydroxyalkanoates) having aromatics groups (so-called PHPhAs) from a microbial origin have been characterized. These polymers were produced and accumulated as reserve materials when a beta-oxidation mutant of Pseudomonas putida U, disrupted in the gene that encodes the 3-ketoacyl-CoA thiolase (fadA), was…
Photoaktivierbare cyclische Nucleotide mit außerordentlich vorteilhaften Eigenschaften wurden unter Verwendung neuer photolabiler Cumarinylmethyl-Schutzgruppen entwickelt (siehe Schema). Sie dienen als ausgezeichnete intrazelluläre Quellen für cAMP und cGMP und ermöglichen die Untersuchung raum- und zeitabhängiger Asp…
To elucidate the interaction mechanism of NO x (NO 2 and NO) and H 2 O on the surface of H-type mordenite (HM), the dynamic adsorption properties of NO 2 + H 2 O + O 2 and NO + H 2 O + O 2 mixtures were examined and the surface reaction of NO x and H 2 O was studied by an in-situ FT-IR spectroscopic method. It was fou…
R67 dihydrofolate reductase (DHFR) is a type II DHFR produced by bacteria as a resistance mechanism to the increased clinical use of the antibacterial drug trimethoprim. Type II DHFRs are not homologous in either sequence or structure with chromosomal DHFRs. The type II enzymes contain four identical subunits which fo…
Drastisch erhöht ein „Cyclodextrin-Mantel“ die Stabilität eines Azofarbstoffs gegen reduktives, oxidatives und Photo-Bleichen, wie das Rotaxan 1 belegt. Diese Verbindung entsteht in Gegenwart des Cyclodextrins in hoher Ausbeute als einziges Isomer aus dem Amin-substituierten Farbstoff und Trichlortriazin in Wasser.
Spatially alternating wetting properties are needed in order to test predictions on droplet contact angles on such complex, non-homogeneous surfaces. An evaporating droplet on a mica surface with hydrophillic strips 0.2–0.3 μm wide, as shown in the picture, recedes smoothly in directions parallel to the strips but in…