Materials Literature
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The role of a miniscaffolding protein, miniCipC1, forming part of Clostridium cellulolyticum scaffolding protein CipC in insoluble cellulose degradation was investigated. The parameters of the binding of miniCipC1, which contains a family III cellulose-binding domain (CBD), a hydrophilic domain, and a cohesin domain,…
Abstract The internal carbon of the inverted pyrrole in N-confused tetraphenylporphyrin 1 (5,10,15,20-tetraphenyl-2-aza-21-carbaporphyrin) was nitrated by using the following aqueous solutions at room temperature for several minutes; (1) NaNO2/HCl (yield 71%) and (2) 30 wt% nitric acid (yield 27%).
Although amphiphilic polystyrene−poly(ethylene oxide) diblock copolymers (PS−PEO) adsorb from aqueous solutions to hydrophobic surfaces, they are unable to form an end-anchored brush. Four independent techniques scanning angle reflectometry, hydrodynamic layer thickness measurements, streaming potential measurements,…
Based on the model combining the spin double exchange and the lattice polaron, we have studied the colossal-magnetoresistance phenomena observed in perovskite manganites ${\mathrm{R}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{A}}_{\mathrm{x}}$${\mathrm{MnO}}_{3}$. First, effects of both the double exchange and th…
The existence of β-C3N4 with hardness characteristics similar or better than diamond was predicted in 1990 by Liu and Cohen. Many studies have since been devoted to the synthesis of this compound. In the present work, carbon nitride films were deposited by various reactive magnetron sputtering processes of graphite ta…
The reaction of N-n-Bu(4)MnO(4) or NaMnO(4) with appropriate reagents in ethanol-pyridine leads to the high-yield formation of new mixed-valence trinuclear oxo-centered Mn(III,III,II) complexes of general formulation [Mn(3)O(X-benzoato)(6)L(3)] (1, X = 2-fluoro, L = pyridine; 2, X = 2-chloro, L = pyridine; 3, X = 2-br…
The chemical composition and microstructure of dual ion beam-deposited CNx films with nitrogen contents in the range 20–33 at.% have been examined by Fourier transform infrared spectroscopy (FTIR) and x-ray photoelectron spectroscopy (XPS). The FTIR spectra together with other published data have been used to construc…
The origin of diffraction peaks observed at low wave vector in many complex glasses remains a central issue in the understanding of amorphous structures. In this work a combination of neutron and x-ray diffraction is used to correlate the contributions from the different atom pair correlations to such peaks in rubidiu…
Ligand-stabilized gold clusters may serve as model catalysts, and the packing of their gold atoms is therefore of great interest. The cluster of the stoichiometry Au 55 [P(C 6 H 5 ) 3 ] 12 Cl 6 is thought to be the smallest known defined compound in which the gold maintains a cubic dense packed metallic (ccp) state. W…
The X-ray structure of tyrosine phenol-lyase (TPL) complexed with a substrate analog, 3-(4'-hydroxyphenyl)propionic acid, shows that Arg 381 is located in the substrate binding site, with the side-chain NH1 4.1 A from the 4'-OH of the analog. The structure has been deduced at 2.5 A resolution using crystals that belon…
Complex formation between pyrazine derivatives and dimeric self-assembly of αααα-isomer of meso -tetrakis(2-carboxy-4-nonylphenyl)porphyrin Zn complex ( 1·Zn ) was investigated. Thermal atropisomerization of 1·Zn in a nonpolar solvent such as toluene gives the αααα-atropisomer exclusively. Vapor pressure osmometry for…
First-principles quantum calculations are potentially of great value for assessing the plausibility of proposed catalytic reaction mechanisms. The present analysis of reaction pathways and energetics for key elementary steps in the catalytic decomposition of NO to N 2 + O 2 by Cu-exchanged zeolites yields novel insigh…
The chemisorptive behavior of CO on several planar model monometallic and bimetallic Pd, Cu, and Au catalysts supported on thin film Al2O3 has been investigated using infrared reflection absorption spectroscopy (IRAS). For Pd and Cu monometallic catalysts, CO adsorption spectra indicate a high representation of low in…
The melt miscibility of atactic poly(propylene) (a-PP) with isotactic (i-PP) and syndiotactic poly(propylene) (s-PP), respectively, is investigated by diffusion experiments of i-PP/a-PP/i-PP or s-PP/a-PP/s-PP sandwich specimens using polarized light microscopy. It is shown that the system a-PP/i-PP is miscible in the…
The crystal structure of ${\mathrm{La}}_{1.2}$${\mathrm{Sr}}_{1.8}$${\mathrm{Mn}}_{2}$${\mathrm{O}}_{7}$ has been determined as a function of temperature in magnetic fields of 0 and 0.6 T. There is a significant magnetostriction at the Curie temperature ${\mathrm{T}}_{\mathrm{C}}$; the a axis contracts (\ensuremath{\D…
Porphyrin dimers linked in the meso -positions by bridges containing alkynes conjugated with the porphyrin π-systems display highly perturbed electronic absorption spectra. We have prepared a series of such dimers using meso -ethynyl nickel(II) octaethylporphyrin as the primary building block. The bridging units inclu…
The hydrothermal reactions of vanadium oxide and molybdenum oxide starting materials with divalent first-row transition metal cations in the presence of nitrogen donor chelating ligands yield the heterometallic hexanuclear clusters [{Zn(bipy)(2)}(2)V(4)O(12)] (2), [{Zn(phen)(2)}(2)V(4)O(12)].H(2)O (3.H(2)O), and [{Ni(…
Abstract The peculiar liquid crystalline behavior of two poly(urethane‐ester)s TDI‐C6C4 and TDI‐C6C8 is reported. Evidence is provided of the formation of two nematic mesophases, a cybotactic nematic and a conventional nematic mesophase, in TDI‐C6C8 and of one cybotactic nematic mesophase in TDI‐C6C4. IR spectroscopy…
Introduction and synopsis Foams can be made out of almost anything: metals, plastics, ceramics, glasses, and even composites. Their properties depend on two separate sets of parameters. There are those which describe the geometric structure of the foam – the size and shape of the cells, the way in which matter is dist…
Abstract Die Wirkungsweise von Rasensprengern, Parfumzerstäubern oder Tintenstrahldruckern beruht auf der Oberflächenspannung. Diese führt dazu, daß sich ein Flüssigkeitsstrahl unter Verringerung der Oberfläche einschnürt und Tropfen bildet. In der Nähe des singulären Punktes, in dem sich ein Tropfen abtrennt, gelten…