Materials Literature
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The influence of an external field acting differently on the two constituents of a binary colloidal mixture performing Brownian dynamics is investigated by computer simulations and a simple theory. In our model, half of the particles (A particles) are pulled by an external force ( A ) while the other half (B particles…
We developed a method to visualize the curved surfaces of valence band dispersion by a display-type spherical mirror analyzer. The π and σ band “surfaces” of graphite measured and displayed three dimensionally contain fruitful information compared to the conventional band dispersion “curves” along a certain direction…
Epitaxial (Al,Ga,Mn)As films were prepared by low-temperature molecular-beam epitaxy and their magnetic properties were investigated. The Mn composition was fixed at approximately 0.05 while Al composition was varied up to 0.30. The results of magnetization and transport measurements for high Al composition samples sh…
Ferrohogbomite-2 N 2 S is a polysomatic hogbomite-group mineral composed of two nolanite modules ( N ) and two spinel modules ( S ) where the spinel modules have ideally hercynite composition. Ferrohogbomite has been described in the literature for a long time but was not distinguished from magnesiohogbomite and simpl…
Abstract The vibrational spectra of palladium phthalocyanine (PdPc) evaporated thin solid films are reported, including the resonance Raman scattering, surface‐enhanced resonance Raman scattering (SERRS) and SERRS mapping of the film surface using micro‐Raman spectroscopy with 633 nm laser radiation. SERRS of PdPc was…
A molecular theory to determine thermodynamic properties of isotropic and nematic phases of liquid crystals is proposed, based on a “convex peg” model and semiempirical PM3 (Parametrized Method 3) calculations. The Helmholtz-free energy of the molecular system, a convex hard core within an encircling spherical square-…
The ability of dextran (513 000 Da) with pendant acetaldehyde groups to increase the wet strength of filter paper was evaluated as a function of the aldehyde content, impregnation pH, and temperature. The impregnation of filter paper with dextran aldehyde increased the wet tensile strength. By contrast, neither dextra…
The nucleation of horse spleen ferritin (HSF) crystals on substrates was investigated using a new modification of the double pulse technique. The influence of three different structureless substrates (glass, glass covered by methyl groups and poly-L-lysin template) on the nucleation was studied. The boundaries in the…
By using a supersaturation gradient along a protein solution contained in a glass capillary tube, we modified the classical double pulse technique, thus substantially accelerating the procedure of measurement of nucleation parameters. Data for the number of crystal nuclei, n vs nucleation time, t, were obtained for he…
The electronic structures of charged carbon nanotube cluster models were calculated with the density-functional-theory (DFT) method. With the increasing number of extra electrons, (a) a potential barrier is formed near the tube wall; its height increases and the width at the highest occupied molecular-orbital (HOMO) l…
Bipolar fatigue in ferroelectric lead–zirconate–titanate was previously shown to induce stable pinning centers for ferroelectric domain walls resulting in a significant loss in switchable polarization, but only fairly weak offsets were induced. The corresponding scenario after unipolar fatigue is reversed inducing fai…
The crystal structure of the ribosome-inactivating protein (RIP) mistletoe lectin I (ML-I) from Viscum album in complex with adenine has been refined to 1.9 A resolution. High quality crystals of the ML-I complex were obtained by the method of vapour diffusion using the high density protein crystal growth system (HDPC…
Non-crystalline solids often emerge from melts with at least three atomic constituents. The study of packing aspects of melts that form glasses or quasi-crystals by investigating effective interactions in multi-component hard-sphere liquids is made possible by the geometrically based fundamental-measure density functi…
Hofmeister anion series are studied to examine the coupled influence of pH and ionic strength on the solubility of previously desalted lysozyme. Solubility curves are measured at pH 4.3 and 8.3 and 18 degrees C for nitrate, para-toluenesulfonate, citrate, sulphate, phosphate, and acetate. Extreme low ionic strength is…
Quantitative time-resolved x-ray microscopy mass transport studies of the early stages of electromigration in an inlaid Cu line/via structure were performed with about 40 nm lateral resolution. The image sequences show that void formation is a highly dynamic process, with voids being observed to nucleate and grow with…
A fully automated system for screening protein crystals for X-ray diffraction analysis has been designed and is being installed on the beamline BW6 at DORIS in Hamburg, Germany. The system includes robotic mounting of flash-frozen crystals from a storage dewar, centering and alignment of the sample both by optical and…
The influence of martensitic and magnetic phase transformations on the optical and magneto-optical (MO) properties of polycrystalline ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ alloy samples, in bulk and thin films, has been investigated. The parameters of charge carriers (plasma and relaxation frequencies) were determined for…
The electropolymerization and deposition of conjugated polypyrrole network films on planar indium tin oxide electrode surfaces is described. The precursor polymer, a polymethacrylate functionalized with pyrrole, PPHMA2, was synthesized and then electropolymerized on ITO substrates. The possibility of inter- and intra…
The influence of salt nature and concentration on tetragonal lysozyme chloride crystal solubility is presented for a set of mono-, di- and trivalent cations (Cs(+), Rb(+), Mn(2+), Co(2+) and Yb(3+)). The results show that cations have as strong an effect on protein solubility as anions and that they present their own…
The crystallization facility of the TB (Tuberculosis) structural genomics consortium, one of nine NIH sponsored p50 structural genomic centres, provides TB consortium members with automated crystallization, data collection and basic molecular replacement (MR) structure solution up to bias minimized electron density ma…