Materials Literature
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The side chains of the interacting pair Asp237(helix VII)-Lys358(helix XI) or Asp240(helix VII)-Lys319(helix X) in the lactose permease of Escherichia coli were extended by replacement with Glu and/or Arg or by site-specific derivatization of single-Cys replacement mutants. Iodoacetic acid was used to carboxymethylate…
Partial discharge activity is both a symptom of degradation in the solid insulating systems of power plants-irrespective of the causative stresses-and a stress mechanism which causes degradation. It can therefore be readily appreciated why the detection, location and interpretation of pd activity is an attractive tech…
Electron Compton scattering from solids (ECOSS) is a technique for obtaining the momentum density distributions of charge carriers in a solid on a scale of mu m or less. The authors discuss the possibilities and the problems of this experimental technique, which uses a conventional transmission electron microscope (CT…
We report a study on gamma irradiated porous Si. The electron paramagnetic resonance study on porous Si irradiated by gamma rays shows that the observed signals come from an intrinsic defect, a Si dangling bond, at the interface of Si/SiOx in porous Si. The photoluminescence measurements show that the gamma irradiatio…
A self-consistent mode coupling model for supercooled fluids is derived from fluctuating nonlinear hydrodynamics (extended to short wavelengths) with attention to detailed balance constraints. The sharp glass transition predicted by mode coupling models based only on pressure nonlinearities does not occur here. Instea…
We have measured the absolute structure factor of liquid water over the wave-number range 0.05k0.30 A${\mathrm{\r{}}}^{\mathrm{\ensuremath{-}}1}$ and temperature range -34T25 \ifmmode^\circ\else\textdegree\fi{}C with small-angle x-ray scattering. The correlation lengths of density fluctuations are small and change ver…
Oriented diamond nuclei prepared by bias-enhanced microwave plasma chemical vapor deposition on β-SiC and Si were characterized by x-ray texture diffractometry. In both cases, x-ray pole figures reveal an epitaxial relation between the orientation of diamond nuclei and the substrate. However, the angular spread of the…
Diblock copolymers in a selective solvent often assemble into spherical micelles. These micelles demonstrate long range order at moderate polymer concentrations. We explore the nature of the disorder-order transition in micellar suspensions through small angle x-ray diffraction studies. The phase behavior includes bod…
We compare reported compositions of a-C:H films in a ternary phase diagram. It is assumed that the films comprised three phases: sp3 hybridized carbon, sp2 hybridized carbon and hydrogen. The data are found to split into two well-separated groups. This separation depends on the method used to measure the sp3/sp2 ratio…
Low-frequency Raman spectra of strong and fragile glass forming liquids were measured in a wide temperature range. From an analysis of the spectra and literature data it is found that the main difference in the dynamic structure factor is the ratio of vibrational to relaxational contributions: The stronger the glass f…
This is an extensively illustrated laboratory manual of transmission electron microscopy techniques for the technician, graduate student, or researcher. Chapters begin with a general discussion, move on to the chemicals and equipment required for the method being described and conclude with a step-by-step presentation…
A demonstration imaging spectrometer using a liquid crystal tunable filter (LCTF) was built and tested on a hot air balloon platform. The LCTF is a tunable polarization interference or Lyot filter. The LCTF enables a small, light weight, low power, band sequential imaging spectrometer design. An overview of the protot…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Chemical modification of proteins has been and continues to be an important biochemical tool for the study of protein structure and function. One such type of approach has been the reductive methylation of lysine residues. In order to address the consequences of such methylation on the crystallization and structural p…
Abstract Cardanol was functionalised to incorporate elements such as phosphorus and bromine and polymerised with formaldehyde or hexamethylenetetramine (HMTA) to get flame retardant polymers. Thus, monocardanyl phosphoric acid (MCPA), its bromoderivative (BrMCPA), and their formaldehyde condensates (MCPAF and BrMCPAF)…
The attenuation coefficients for hollow sapphire and lead-based, oxide glass waveguides are calculated using an approximate formalism from Marcatili and Schmeltzer [Bell Syst. Tech. J. 43, 1783-1809 (1964)]. These results are compared with an exact calculation, and the agreement is found to be excellent for bore diame…
We investigate experimentally the generation of hexagonal patterns of filaments in a laser beam traversing a thin liquid crystal cell placed in front of a single ‘‘virtual mirror.’’ This mirror is the image of a real mirror and is placed either in front of or behind the cell. The results clearly support the physical i…
A previously reported multistep hot filament chemical vapor deposition process for nucleating diamond directly on nickel substrates has been further refined to increase the nucleation density and improve the orientation of diamond films. The process employed heavy seeding of both 〈100〉 and 〈111〉 oriented single crysta…
Phase diagrams of a set of three monodisperse polystyrene lattices in the presence of non-adsorbing polymer molecules (hydroxyethyl cellulose) have been determined. Polymer molecules induce reversible phase transitions involving gas, liquid and solid-like states. We find that the phase diagrams can have two distinct t…