Materials Literature
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Bioactivation of carcinogens by peroxidases has received increasing attention since the discovery of the oxidation of carcinogens by prostaglandin hydroperoxidase. Benzidine and 3,5,3',5'-tetramethylbenzidine are oxidized by horseradish peroxidase and prostaglandin synthase to two-electron oxidation products (di-imine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton magnetic resonance studies on high-spin iron(III) porphyrinsD. V. Behere, R. Birdy, and S. MitraCite this: Inorg. Chem. 1982, 21, 1, 386–390Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 January 1982https://pu…
In the hexagonal tungsten bronze ${\mathrm{Rb}}_{x}\mathrm{W}{\mathrm{O}}_{3}$, the ordering of the vacancies of the Rb sites has been observed by neutron diffraction measurements. This ordering is the cause of the resistivity anomaly observed by Stanley et al. Another type of structural transition has also been found…
Electron diffraction and high resolution electron microscopy have brought to light three new ordered structures in a material of composition CaMnO(2.50 ± 0.02); in all these structures as well as in another analogous oxide, CaMnO2.75, the original features of the perovskite structure are preserved, thus offering an ex…
The existence of the monopoles both with one x (+2) line and two x (+1) lines in cholesteric volumes with spherical shape is shown experimentally by microscopic observations with polarized light. The effect of disapperarnce of x lines near the cholesteric-smectic A transition is discovered.
Using samples from 96 bales of Texas High Plains cotton, multiple regression techniques were used to select the "best" functional expression for the impacts of High-Volume-Instrument-measured fiber properties on the strength of open-end spun yarns. Results indicate that the most important fiber properties are strength…
Temperature variation of the refractive indices, birefringence, density and order parameter of liquid crystalline mixtures E7, E8, N10 and PCH-1132 are reported. The birefringence of PCH-1132 is found to be abnormally low compared to other mixtures.
Hydrothermal Isometric Tension (HIT) relaxation was observed at the boiling point in rat, cat and human skin samples of different ages, after raising the temperature from 37 degrees to 100 degrees C at a rate of 1.15 degrees C/min. A Maxwellian relaxation to nearly zero was observed at the boiling point. A given veloc…
ABSTRACT Oxygen‐sensitive foods are frequently packaged under vacuum or with inert‐gas flushing. This paper describes a method for oxygen removal from air headspaces in transparent packs by a singlet oxygen reaction in a polymer film. Illumination of a package enclosing a coiled film containing a photosensitising dye…
Abstract A reevaluation of the chemical, physical and physicochemical properties of the mineral in tooth enamel and dentine shows that the current models can not adequately account for the observed characteristics. On the basis of thermodynamical and solid state chemical principles an alternative model for the mineral…
Des résultats cristallographiques, concernant la série de conducteurs organiques à radicaux cationiques (TMTTF)2X avec X = Br-, I -, BF-4, ClO-4, NO -3, PF-6, SCN- ont été rassemblés et étudiés comparativement. Différents paramètres anioniques (forme, volume, pouvoir attractif) sont présentés et leur influence est dis…
Thermal degradation of polyethylene was studied under a wide range of oxidative degradation conditions including flaming combustion. The collection techniques described were designed to isolate the product mixtures so that secondary reactions were minimized. Both pyrolytic and oxidative degradation products were gener…
In large motors and generators, the surfaces of the stator coils and bars are finished with a partially conducting coating to suppress discharge activity between the insulation surface and the core. However, slot discharge activity has been reported in some air-cooled motors and generators where significant areas of t…
The MoV centre formed by u.v.-irradiation of a single crystal of [NH3Pr]6[Mo7O24]·3H2O has been studied by e.s.r. at room temperature. The e.s.r. spectra are attributed to a localized octahedral MoVO5(OH) site, resulting from transfer of a hydrogen bonding proton from a [NH3Pr]+ nitrogen to a bridging oxygen atom. The…
We adapt to the smectic case the classical lubrication theory; plastic relaxation by edge dislocations climb is the controlling factor of the process, which appears to be more efficient than in the classical case. We show the existence of a critical velocity for the appearance of the undulation instability of the laye…
We give three applications of quasisyrnmetry. The first two applications involve derived conditional distributions in a study involving matched individuals where the parameters associated with the matching are eliminated by appropriate conditioning. Extensions to matched triplets or to larger blocks lead to generaliza…
An electron spin echo (ESE) study of the internal motion of the CH2 protons in irradiated zinc acetate dihydrate crystals shows that quantitative measurements of the motional correlation time can be obtained quite directly from pulsed measurements. In the slow motional limit, the motional correlation time is equal to…
The object of this work was to investigate the influence of long-time aging at elevated temperatures between 300 and 500°C and aging times up to 65 000 h on the impact toughness and the structural properties of CF8 and CF8M cast steels. The results are derived from 18 production heats with varying chemical analysis an…
A Bethe lattice with a given coordination number can be described in terms of a regular tiling of the hyperbolic plane. An interest of this description is the possibility of intermediate lattices between regular lattices in Euclidean plane and Bethe lattices with the same coordination number.
Polymerization of chemically synthesized dn2h6ATP and dn2ATP by deoxynucleotidyl transferase from calf thymus furnished poly(dn2h6A) and poly(dn2A) respectively. The synthetic polynucleotides were characterized by spectroscopic, ultracentrifugation and enzymatic methods. In polynucleotide-polynucleotide interaction, p…