Materials Literature
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To deepen our understanding of Ca2+-activation in calmodulin-dependent reactions, the properties of Ca binding to calmodulin were examined by dual-wavelength spectrophotometry using a Ca indicator, tetramethylmurexide. The Scatchard plot for Ca binding to calmodulin was linear, indicating the occurrence of homogeneous…
We present 1H and 77Se NMR relaxation data on oriented (TMTSF)2ClO4 single crystals in the relaxed state. The data show the existence of three distinct regimes for the nuclear relaxation rate T-11. In the high temperature part (T > 25 K) the Korringa law seems to be well satisfied whereas in the lower temperature part…
Abstract The changes in the structure and morphology of a random copolymer containing 92 mol % glycolide units and 8 mol % lactide units as a function of in vitro hydrolysis have been studied. A number of techniques, such as wide‐angle x‐ray diffraction, small‐angle x‐ray scattering, density measurements, infrared spe…
Abstract Secondary porosity in sandstones is created by subsurface dissolution of grains or cement by pore water that is undersaturated with respect to one or more of the major mineral phases. Such undersaturated pore water may be derived from: (1) meteoric water driven by a hydrostatic head; (2) compactional pore wat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic compounds of the lanthanides. Part 17. Tris[(tetramethylethylenediamine)lithium] hexamethyl derivatives of the rare earthsHerbert Schumann, Jochen Mueller, Norbert Bruncks, Harald Lauke, Joachim Pickardt, H. Schwarz, and Klaus EckartCite this: Organometallics…
The details of a method of preparing anodic aluminum oxide membranes are presented. The porous oxide layer consists of close-packed cells of oxide, hexagonal in shape, each of which contains a single pore formed perpendicularly to the surface of the aluminum substrate. This special structural feature is essentially im…
We have measured the forces F as a function of surface separation D acting between two smooth curve mica sheets, immersed in aqueous electrolyte medium (potassium nitrate), both in the absence and in the presence of polyelectrolyte (poly-L-lysine, M= 90 000) adsorbed onto the surfaces from solution. Forces between the…
Films of Prussian Blue (PB) deposited by electroreduction in the absence of K + have absorbance maxima at 730 nm which narrow and shift on voltammetric cycling in KCI solution to 690 nm, these absorptions being deemed diagnostic of 'insoluble' and 'soluble' PB respectively. Spectroelectro- chemistry shows that the ini…
Abstract Anhand der Ergebnisse von Modellversuchen mit Bodenproben aus verschiedenen Ober‐ und Unterbodenhorizonten unterschiedlichen Stoffbestandes werden die für die Löslichkeit und Bindung der Schwermetalle Cu, Zn, Cd und Pb unter oxidierenden Bedingungen wichtigsten Einflußgrößen ermittelt. Das Löslichkeitsverhalt…
Carbon films were deposited using mass-separated C+ ions of 300 and 600 eV. The films have diamond-like characteristics such as transparency in the visible spectral region with wavelengths longer than about 650 nm and in the infrared, and high electrical resistivity. Transmission electron diffraction analysis shows th…
An alignment method for smectic liquid crystals is described. Alignment is obtained by the deposition of a certain class of polymer on a substrate followed by unidirectional rubbing. Only linear polymers capable of being elongated in bulk samples are found to produce alignment. The quality of alignment is found to be…
The electrochemical polymerization of pyrrole on a platinum electrode covered with a film of poly(vinyl chloride) produces a dark brown, ductile, and flexible composite polymer film with an electrical conductivity comparable to polypyrrole, and mechanical properties very simllar to poly(vinyl chloride).
Abstract The modification of an amorphous random ethylene‐propylene rubbery copolymer (EPM) has been accomplished by solution grafting of maleic anhydride molecules promoted by radical initiators, The resulting EPM‐g‐succinic anhydride (EPM‐g‐SA) and EPM have been used to obtain binary polyamide 6/EPM or polyamide 6/E…
Electron microscopic examination of epiphyseal cartilage tissue processed by high pressure freezing, freeze substitution, and low temperature embedding revealed a substantial improvement in the preservation quality of intracellular organelles by comparison with the results obtained under conventional chemical fixation…
The stability of the SDW phases in (TMTSF)2ClO4 can be interpreted by simple arguments of anisotropic Fermi surfaces nesting : first, we show that anion ordering, by introducing new Bragg's reflexions, perturbs the nesting and lowers the SDW stability. Then, we improve Gor'kov and Lebed's argument on the effect of a m…
For a simple anisotropic metal model with two open nested Fermi surfaces, it is shown that the tendency to spin density wave formation increases when a magnetic field is applied, which could lead to a series of phase transitions as functions of the field value. The results are suggested as an explanation of the phase…
Etude theorique du procede d'oxydation radiolytique du graphite dans des reacteurs refroidis par l'anhydride carbonique. Etude experimentale de l'influence de cette oxydation sur differentes proprietes physiques et mecaniques du graphite. Influence de cette oxydation sur la duree de vie des briques de graphite utilise…
The solvent effect on the quantum yield of the self-sensitized photoperoxidation of 1,3-diphenylisobenzofuran has been investigated. The influence of the singlet-oxygen lifetime as well as the viscosity of the solvent are quantitatively described.
Thermal decomposition behavior of titanium hydride (TiH2) powder at temperatures between 250 and 330 °C (523 and 603 K) has been studied from both thermodynamic and kinetic viewpoints. Equilibrium hydrogen pressure measured in a closed system was found to vary from the order of 10−3 to 10−2 Torr (10−1 to 1 Pa) and the…
Abstract Rate studies are reported of the effect of rehydration‐dehydration cycling on the vapor hydration behavior of solid K 2 CO 3 . Isothermal rate data were obtained at different temperatures and water vapor pressures for the reaction of narrowlysized anhydrous particles. Effects of different particle preparation…