Materials Literature
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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…
The ground-state properties of the pentameric Co(II) cluster [Co(3)W(D(2)O)(2)(CoW(9)O(34))(2)](12-) were investigated by combining magnetic susceptibility and low-temperature magnetization measurements with a detailed inelastic neutron scattering (INS) study on a fully deuterated polycrystalline sample of Na(12)[Co(3…
Parallel hexagonal prisms of cancrinite (CAN) with channels perpendicular to the substrate surface were obtained by heteroepitaxial growth on millimeter-sized sodalite (SOD) single crystals. The experiment was planned on the basis of a model in which the ABABAB stacking sequences along the cancrinite [0001] direction…
Different sizes of core-functionalized metallodendritic wedges were prepared by anchoring sensor-active arylplatinum(II) sites at the focal point of Fréchet-type polyether dendritic wedges of various generations. The strong color of these metallodendrimers in the presence of SO2 was used to assess the permeability of…
At 4 GPa and 900°C, hexagonal high-pressure LiGe—a Zintl phase—with a new structural motif was prepared: isolated hexagonal channels built up by three-coordinate Ge− ions. These channels consist of puckered germanium six-membered rings of distorted chairs and boats (see picture). Li+ counterions are found in the cente…
Eine dynamische Oberfläche kann die Migration anhaftender Zellen auslösen: Bei einer selbstorganisierten Monoschicht mit exponierten Hydrochinon-Einheiten wurden diese durch elektrochemische Oxidation in Benzochinon-Einheiten überführt, woran sich eine Diels-Alder-Reaktion mit einem Cyclopentadien-modifizierten Peptid…
Abstract The miscibility of poly(vinyl alcohol) (PVA)/methylcellulose (MC) blends was investigated over the entire composition range using the dynamic mechanical analyzer (DMA) and the differential scanning calorimeter (DSC). On the basis of the glass transition temperature, determined by DMA, one could conclude that…
The changes in the layered structure of Mg-Al hydrotalcite (Mg/ Al = 2) during heat treatment have been investigated by using in situ XAFS simultaneously at the Mg and Al K-edges. The development of unique in situ instrumentation allowed the coordination environments at both the Mg and Al centers to be monitored as a…
Silver double salts containing embedded C22− ions have been isolated by using [15]crown-5 (15C5) as a structure-directing agent. Unprecedented low dimensionalities are found for these compounds, which exist either as discrete molecules or as a zigzag chain. They feature different kinds of silver cages each sandwiched…
A novel field-induced approach has been developed that allows the controlled ordering of colloidal particles in confined systems. In this approach, an electric field is used to create a strong lateral dipole−dipole interaction that induces colloidal crystallization in two-dimensional geometries. Because the particle d…
Abstract Perfectly‐alternating linear (AB) n multiblock copolymers consist of n AB block pairs covalently linked in an alternating sequence. Although these copolymers can microphase‐order in the same fashion as their lower‐order ( n = 1) diblock analogs, the 2( n − 1) biconformational midblocks comprising each copolym…
Abstract Conductive polymeric based composites were derived from ethylene vinyl acetate rubber filled with Vulcan XC‐72, short carbon fiber (SCF), and their blends. The electromagnetic interference (EMI) shielding effectiveness (SE), return loss, and reflection coefficient were studied. The measurements of the SE of t…
We measured dynamic shear moduli of poly(macromonomer)s of an increased backbone chain length and those bearing branch chains of increased branch length up to the critical molecular weight for the intermolecular chain entanglement, M c, of a linear polystyrene as functions of frequency and temperature using a parallel…