Materials Literature
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The interaction of $3d$ transition metal atoms and dimers with a single-walled armchair carbon nanotube has been investigated by first-principles density functional calculations. For Fe-, Co-, and Ni-doped (4,4) nanotubes, outside adsorption sites are the most favorable. The interactions are largely ferromagnetic for…
A capability for scanning electron microscopy of wet biological specimens is presented. A membrane that is transparent to electrons protects the fully hydrated sample from the vacuum. The result is a hybrid technique combining the ease of use and ability to see into cells of optical microscopy with the higher resoluti…
We have performed elastic diffuse neutron-scattering studies on the relaxor $\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}.$ The measured intensity distribution near a (100) Bragg peak in the (hk0) scattering plane assumes the shape of a butterfly with extended intensity in the (110) and $(11\ifm…
Uniformly distributed ZnO nanorods have been grown by plasma-enhanced chemical vapor deposition using a two-step process. By controlling the oxygen content in the gas mixture during the nucleation and growth steps, no catalyst is required for the formation of ZnO nanorods. High-resolution transmission electron microsc…
Freestanding single-crystal complete nanorings of zinc oxide were formed via a spontaneous self-coiling process during the growth of polar nanobelts. The nanoring appeared to be initiated by circular folding of a nanobelt, caused by long-range electrostatic interaction. Coaxial and uniradial loop-by-loop winding of th…
In Gram-negative bacteria, intercellular communication and virulence regulation is mediated by the diffusible chemical signal acyl-homoserine-L-lactone (AHL). The AHL synthase enzymes produce a variety of AHLs from the substrates S-adenosyl-L-methionine and acyl-acyl carrier protein. LasI, the AHL synthase from Pseudo…
Since excimer laser applications extend to deep and vacuum UV wavelengths at 193 nm and 157 nm, renewed research interest has recently arisen on fluoride thin films due to their unrivaled position as wide-band-gap material for the vacuum UV (VUV). In order to evaluate the development of mechanical stress in all dielec…
Not a creature from the ocean depths, but the product of synthetic chemistry aided by self-assembly is shown in the photomicrograph. The densely packed, hollow spheres with highly blistered surfaces offer the possibility of a useful encapsulation system which is simple, cheap, and endowed with a particularly high capt…
The image quality of ion-induced secondary electron images generated with a MeV nuclear microprobe has previously been severely limited by the large beam current fluctuations produced by Van de Graaff accelerators. In this article we report the use of a solid state Cockroft–Walton type accelerator (HVEE™ Singletron) t…
The interaction between platelet glycoprotein (GP) Ib alpha and von Willebrand factor (VWF) is essential for thrombus formation, leading to the arrest of bleeding. The N-terminal domain of GP Ib alpha, which contains the binding sites for VWF and alpha-thrombin, crystallized in the tetragonal space group P4(3) with on…
This study examined the solid-state structure of copolyesters based on smectic poly(diethylene glycol 4,4‘-bibenzoate) (PDEGBB) and non-liquid crystalline poly(diethylene glycol isophthalate) (PDEGI). The isophthalate content was varied from 10 to 50 mol %. Differential scanning calorimetry (DSC), Fourier transform in…
The presented work is embedded in the research network “Integrative Ion Processes for Modern Optics”, called IntIon, consisting of 12 partners from the German optics industry and two research institutes. The main target of the IntIon network is the development of new process concepts on the basis of ion assisted depos…
An aqueous deoxygenated dilute PVME solution (cP = 0.5 mass %) was irradiated with gamma-rays at different radiation doses (D = 0.2-10 kGy). At these concentrations and doses contracted molecules are formed but no macroscopic networks. For the analysis of the structural changes, the irradiated samples were analyzed by…
Extra-small microcrystals of a human kinase CK2alpha were obtained for the first time by the optimization of a recent protein crystallization method based on highly packed protein nanofilm template. Protein crystal induction and growth appear indeed optimal at high surface pressure of the film template yielding high p…
Thermal properties and solid-state structure of copolyesters based on smectic poly(diethylene glycol 4,4‘-bibenzoate) (PDEGBB) and non-liquid crystalline poly(diethylene glycol isophthalate) (PDEGI) were characterized previously. The present study examined the oxygen transport properties and free volume characteristic…
A large high-quality zeolite MFI single crystal 3.0 × 1.5 × 1.5 mm 3 in size was synthesized by means of a nutrition supplemental method and a p -nitroaniline (PNA)/MFI single crystal was prepared via physical vapor deposition. The light yellow PNA/MFI single crystal changed to green when irradiated by 1062 nm fundame…
Using DECODER (direction exchange with correlation for orientation distribution evaluation and reconstruction) NMR, we probe the orientations of carbonyl carbons in [1-(13)C]glycine-labeled dragline silk under conditions of varying strain and fiber draw rate. A model-specific reconstruction of the molecular orientatio…
[reaction: see text] Synthesis of a chiral, strapped, cyclic bis(benzimidazole) ligand is reported. This compound forms a stable, Jahn-Teller-distorted, octahedral Cu(II) complex in which the elongated axis is positioned within the main macrocycle. The C(2)-symmetric bis(benzimidazole) core adopts a highly ruffled con…
A series of aregic poly(ester amide)s ( ar -PEALM) with ester to amide groups ratios ( a: b ) ranging from 1:50 up to 1:2 were prepared from O -methyl- l -malic acid, 1,6-hexanediol, and 1,6-hexanediamine. The ester linkage was incorporated in the poly(ester amide) chain using 6-aminohexylpentachlorophenyl O -methyl-…
The development of tunable filters is a key point for the ability of optical telecommunication networks to comply with the continuous evolution of the service providers needs. Among the numerous technologies which can be used to achieve narrow bandpass filtering devices, we concentrate our analysis on Thin-Film Interf…