Materials Literature
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We propose a new procedure in biological cryocrystallography, using the laser-ablation technique. This is the first report on the successful processing of cryo-cooled crystals to create a “protein crystal ball” that is conducive to X-ray diffraction (XRD) data collection. Pulsed UV laser soft ablation (PULSA) modifies…
The effects of end-group balance and moisture level on melt-phase polycondensation reactions were investigated using nylon 612. The polycondensation reaction was determined to be first-order in amine ends and first-order in carboxyl ends at the relatively high temperature (284 °C) and low water concentration condition…
The chemical depth profile of the passive oxides formed on a stainless-steel surface (type 430, Fe–16.3%Cr) in pH 8.4 borate solution was obtained quantitatively by in situ anomalous x-ray reflectivity. The passive film consists of a Cr oxide inner layer and a Fe∕Cr oxide outer layer. The absence of Fe oxide underneat…
Recent experiments indicate that liquid crystals can be used to optically report the presence of biomolecules adsorbed at solid surfaces. In this work, numerical simulations are used to investigate the effects of biological molecules, modeled as spherical particles, on the structure and dynamics of nematic ordering. I…
1,4,8,11,15,18,22,25-Octahexyl-29H,31H-tetrabenzo[b,g,l,q][5,10,15]triazaporphyrin has been isolated as the main side product in the preparation of 1,4,8,11,15,18,22,25-octahexylphthalocyanine via a lithium pentyloxide induced cyclotetramerisation of 3,6-dihexylphthalonitrile.
A simple and versatile light-based strategy to grow low-dimensional gold superstructures is presented; prolonged UV-irradiation of TiO2 nanorod-stabilized Au nanoparticles in organic media promotes the progressive formation of distinctive chainlike metal assemblies, namely segments of a few gold particles, 2D or quasi…
Biphasic electrode systems allow electrochemical reactions to be driven in a microphase of organic liquid (typically 1-100 nL), which is coupled via ion transfer processes to the surrounding aqueous electrolyte medium. Microdroplet deposits on basal plane pyrolytic graphite as well as thin film deposits of the organic…
Time differential perturbed angular correlation measurements in ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{Mn}}_{0.995}{\mathrm{Hf}}_{0.005}{\mathrm{O}}_{3}$, using $^{181}\mathrm{Hf}$/Ta probe nuclei, reveal the presence of two distinct hyperfine components, identified with ${\mathrm{Mn}}^{4+}$ rich and deficien…
Abstract The hydrothermal reaction of VOSO 4 , As 2 O 5 , piperazine and H 2 O produces [H 2 N(CH 2 ) 4 NH 2 ] 4 [β‐As 8 V 14 O 42 (SO 4 )]·2HSO 4 ( 1 ), which is the first arsenic‐vanadium cluster containing a spherical β ‐As 8 V 14 O 42 shell. The structure of this compound was characterized by single crystal X‐ray…
In this paper, the variation of the values of dihedral angles in proteins is divided into two categories by analyzing distributions in a database of structures determined at a resolution of 1.8 A or better [Lovell et al. (2003), Proteins Struct. Funct. Genet. 50, 437-450]. The first analysis uses the torsion angle for…
Femtosecond one- and two-colour pump-probe spectroscopy of single-walled carbon nanotubes (SWNTs) individual in aqueous surfactant suspensions has been used to assess the "intrinsic" lifetime of the lowest excited states. We demonstrate that such measurements can be perturbed by several competing photophysical process…
A freshly cleaved mica surface silanized by 3-aminopropyl triethoxysilane is flat over a large area, displays a controlled degree of hydrophobicity and contains positive charges. In this paper, mica sheets silanized by this method have been used as crystallization surfaces for lysozyme, trichosanthin and three other p…
A first-principles multielectron method is applied to the calculations for the cooperative transitions of trivalent ytterbium ions (Yb3+) in yttrium aluminum garnet (Y3Al5O12; YAG) and yttrium sesquioxide (Y2O3) crystals. The method is based on a molecular-orbital method, in which the overlap between the Yb 4f and the…
Monolayer-protected nanoparticles (MPNs) with average core sizes of 1.7- (small), 2.2- (medium) and 4.5-nm (large) diameter have been prepared and functionalized with a variety of aryl ketone substrates, namely, 11-mercaptoundecaphenone (1), 1-(4-hexyl-phenyl)-11-mercaptoundecanone (2), 1-[4-(11-mercaptoundecyl)phenyl…
We propose materials design of ferromagnetic diamond without any transition metal elements based on first principles calculations. The electronic structure and the magnetic properties of impurities-doped diamond are calculated by using the Korringa-Kohn-Rostoker method within the local spin density approximation with…
Abstract Several derivatives of formulae [M(terpy) 2 ](TCNQ) 2 or [M(terpy) 2 ](TCNQ) 3 (M = Ni, Cu, Zn; terpy = 2,2′:6′,2"‐terpyridine; TCNQ= 7,7,8,8‐tetracyanoquinodimethane) and [M(phen) 3 ](TCNQ) 2 or [M(phen) 3 ](TCNQ) 4 (M = Fe, Ni; phen = 1,10‐phenanthroline) have been obtained. The crystal structures of [M(ter…
The binding of N-acetylglucosamine oligosaccharides (NAGn, n = 2-6) to hen egg-white lysozyme (HEWL; EC 3.2.1.17) was investigated by X-ray powder diffraction at room temperature. Each NAGn examined was found to bind to lysozyme in rapid-precipitation preparations in 1.0 M NaCl pH 6.0 buffer. The location of each NAGn…
Porous poly-silicon (PPS) samples, obtained by electrochemical anodization of p-type poly-silicon wafers, were doped with Pd by the electroless process. Rutherford backscattering spectroscopy shows that Pd has diffused a few micrometres into the PPS layer. Scanning electron microscopy and energy dispersive x-ray analy…
Hydrogenated diamond-like carbon (DLC) films were deposited on Si (100) wafers by a plasma enhanced chemical vapour deposition technique using CH 4 plus Ar as the feedstock. The friction and wear properties of the resulting films under different relative humidities, ranging from 5% to 100%, in a nitrogen environment,…
A common structural motif for many proteins comprises rigid domains connected by a flexible hinge or linker. The flexibility afforded by these domains is important for proper function and such proteins may be able to adopt more than one conformation in solution under equilibrium conditions. Small-angle scattering of p…