Materials Literature
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Abstract The mechanical and electrical response of Pb (Mg 1/3 Nb 2/3 )‐ O 3 –PbTiO 3 single crystals to micro‐indentation are investigated using the newly developed low frequency scanning probe acoustic microscopy which is based on the atomic force microscope. There are three ways to release the stress produced by ind…
Funktionell und extern steuerbar sind elektroaktive Nanostrukturen, die durch Selbstorganisation von ionischen Bausteinen entstehen. Die kolumnaren Strukturen (siehe Bild) bestehen aus rechteckigen Oligoanilin-Baueinheiten und Phosphattensiden mit zwei Kohlenwasserstoffketten. Beim Erhitzen bricht die Ordnung der tetr…
Konformationsabhängige Farbeinstellung: Ausgehend von aryloxysubstituierten Perylenbisimiden wurden für drei unterschiedliche Brückenlängen jeweils zwei isomere diagonal (A) und lateral (B) überbrückte Makrocyclen synthetisiert (siehe Bild). Diese Isomere weisen unterschiedliche konformative Eigenschaften auf und könn…
Einen großen Stromtransport und eine ähnlich schnelle Diffusion wie in Flüssigkeiten bietet eine farbstoffsensibilisierte Solarzelle (dye-sensitized solar cell, DSSC), die den plastisch-kristallinen Elektrolyt Succinonitril und das Redoxpaar I−/I3− enthält (siehe Graph). Nach diesem Modell könnten echte Feststoff-DSSC…
Die Entfernung flüchtiger organischer Verbindungen (VOCs) gelingt besonders effizient mit einem dreidimensionalen mesoporösen Chromoxid (siehe Bild). Unter Umgebungsbedingungen wirkt das Material als selektives Sorbens für VOCs (z. B. Toluol), bei höheren Temperaturen ist es dagegen ein effektiver und selektiver Katal…
The surface quality of coronary stents has a significant influence on its biocompatibility. Therefore, surface polishing is of paramount importance in the production and application of stents. In the present study, electropolishing is performed on 316LVM steel slotted tube coronary stents. Additionally, acid pickling,…
Cr and Mo tetracarbonyl complexes bearing the diimine ligand N,N′-bis(ferrocenylmethylene)ethylenediamine (FcNN) have been prepared from the ligand and M(CO)6. Two isomeric forms of (FcNN)Mo(CO)4, corresponding to the cis,cis and cis,trans geometries with respect to the CN bonds of the free ligand, were shown to exist…
Reaction of Ce(III) with lacunary versions of [H(4)XW(18)O(62)](7-) (X = P, As) yields the 1:2 complexes [Ce(H(4)XW(17)O(61)](19-) (X = As, 1; P, 2) in good yield, characterized in solution and the solid state by NMR spectroscopy and X-ray crystallographic analysis, respectively. The structures confirm a syn C(2) conf…
SiO2-Nanopartikel mit einstellbarer Mesostruktur und ultrafeiner Partikelgröße wurden durch Hydrothermalsynthese mithilfe von Triblock-Copolymer- und Fluorkohlenstoff-Tensiden erhalten. Die TEM-Aufnahme zeigt eine solche, etwa 300 nm große Partikel.
Abstract A novel fluorinated diamine monomer, 2,2‐bis[4‐(4‐amino‐2‐trifluoromethylphenoxy)phenyl]propane (2), was prepared through the nucleophilic substitution reaction of 2‐chloro‐5‐nitrobenzotrifluoride with 2,2‐bis(4‐hydroxyphenyl)propane in the presence of potassium carbonate, followed by catalytic reduction with…
Abstract A 2,6‐dimethyl phenol‐dicyclopentadiene novolac (DCPDNO) was synthesized from dicyclopentadiene and 2,6‐dimethyl phenol, and the resultant DCPDNO was reacted with cyanogen bromide into 2,6‐dimethyl phenol‐dicyclopentadiene cyanate ester (DCPDCY). The structures of the novolac and cyanate ester were confirmed…
Abstract Biomass‐based polyurethane foams (PUFs) were degraded by glycolysis and the polyols recovered were reused to prepare a rigid polyurethane foam. Biomass‐based PUFs were prepared from liquefied wood or starch polyols and grafted products with polycaprolactone. The glycolysis was conducted using diethylene glyco…
Chymotrypsin is a prominent member of the family of serine proteases. The present studies demonstrate the presence of a native fragment containing 14 residues from Ile16 to Trp29 in alpha-chymotrypsin that binds to chymotrypsin at the active site with an exceptionally high affinity of 2.7 +/- 0.3 x 10(-11) M and thus…
Abstract A model is proposed for the layered structure of a polymer surface modified by elemental fluorine mixed with helium. The composition of the modified surface layer has been determined, and the thermodynamic compatibility of the surface layer, transition layer, and unmodified bulk of the polymer has been studie…
Bicarbonate ion reacts with the dinuclear nickel(II) complex containing the taec ligand (taec = N,N',N' ',N' ''-tetrakis(2-aminoethyl)-1,4,8,11-tetraazacyclotetradecane) in buffered aqueous solution to form the mu-eta(2),eta(2)-carbonate complex with a large effective binding constant for bicarbonate ion, log K(B) = 4…
Abstract The synthesis of polysulfide polymers with unsaturated and saturated units in the backbone and their characterization by Fourier transform infrared, NMR, gel permeation chromatography, thermogravimetric analysis, and differential scanning calorimetry are reported. This is the first report on an analysis of th…
Using a simple experimental setup, the hydraulic permeability of fibrous nonwoven polyglycolic acid (PGA) scaffolds is studied after different degradation durations in PBS. The hydraulic permeability of the scaffolds increased with the degradation time. After being incubated for about 4 weeks, the permeability of the…
The multiple histidine-aspartate phosphorelay system plays a crucial role in cellular adaptation to environments in microorganisms and plants. Like kinase-phosphatase systems in higher eukaryotes, the multiple steps provide additional regulatory checkpoints with phosphatases. The Escherichia coli phosphatase SixA exhi…
Aniline sulfonic acid derivatives, o - and m -aminobenzenesulfonic, 3-amino-4-methoxybenzenesulfonic, 3-aniline-1-propane sulfonic acid, and 4-aniline-1-butane sulfonic acids, are incorporated via direct coprecipitation between the sheets of a layered double hydroxide (LDH) of intralamellar composition Cu 2 Cr(OH) 6 .…
AMP-forming acetyl-CoA synthetases (ACSs) are ubiquitous in all three domains of life. Here, we report the first characterization of an ACS from a hyperthermophilic organism, from the archaeon Pyrobaculum aerophilum. The recombinant ACS, the gene product of ORF PAE2867, showed extremely high thermostability and thermo…