Materials Literature
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Photoemission from a many-electron system is a many-electron process, even though the transition operator may affect only one electron directly. Relaxation and “shake-up” structure are related by a sum rule: when one is present, the other must also be present. Shake-up structure is shown to be accurately predictable i…
The existence of ferroelectricity in the chiral smectic C phase has been established from polarization measurements in the presence of an electric field [1]. In this article we study the case where the polarization is created by applying a shear velocity parallel to the smectic planes : The helicoidal structure is dis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and reactivity of ruthenium(II) porphyrin complexes. Photochemical ligand ejection and formation of ruthenium porphyrin dimersFrederick R. Hopf, Terrence P. O'Brien, W. Robert Scheidt, and David G. WhittenCite this: J. Am. Chem. Soc. 1975, 97, 2, 277–281Publication…
The ferroelectric properties of fine-grained PbTiO3 ceramics modified by small amounts of La and Mn have been investigated using both quasi-static (∼ 0.05 Hz) and more dynamic (0.5-50 Hz) electric driving fields.Information about the domain reorientation processes were obtained from lateral switching strain and hyster…
Absorption and fluorescence spectra of ${\mathrm{Tm}}^{3+}$ in single-crystal LiY${\mathrm{F}}_{4}$ were recorded at temperatures between 5 and 77 K. The energy levels for the ground configuration were established from these data with the aid of theoretical calculations. Parameters were obtained that gave a least-squa…
The disordered ferrite system, ${\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Zn}}_{x}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ for $0\ensuremath{\le}x\ensuremath{\le}0.95$ has been studied by the M\"ossbauer-effect technique at 4.2 K in applied magnetic fields of 50 and 90 kOe. In these fields a ferrimagnetic structure is implie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Transition Behavior of Polyurethanes Based on Toluene DiisocyanateN. S. Schneider, C. S. Paik Sung, R. W. Matton, and J. L. IllingerCite this: Macromolecules 1975, 8, 1, 62–67Publication Date (Print):January 1, 1975Publication History Published online1 May 2002Publis…
1) Glucose dehydrogenase from Bacillus megaterium has been purified to a specific activity of 550 U per mg protein. The homogeneity of the purified enzyme was demonstrated by gel electrophoresis and isoelectric focusing. 2) The amino acid composition has been determined. 3) The molecular weight of the native enzyme wa…
Absorption from the metastable $^{2}E$ and $^{2}T_{1}$ states of ${\mathrm{Cr}}^{3+}$ has been measured in ruby with more precision than in previous experiments and in emerald and MgO: ${\mathrm{Cr}}^{3+}$ for the first time. The sharp $^{2}E$, $^{2}T_{1}\ensuremath{\rightarrow}^{2}T_{2}I$ lines are resolved in these…
Decalcification of echinoderm tissues for electron microscopy can be achieved after glutaraldehyde-osmium fixation by treatment with a 1:1 mixture of 2% ascorbic acid and 0.3 M NaCl for 12-24 hours. Electron photomicrographs of material decalcified by this procedure are superior to those from EDTA-treated tissue and s…
Lactose, a disaccharide more commonly known as milk sugar, is and has been a major problem for the dairy and food industry. First, the majority of human adults are incapable of digesting it owing to the deficiency of the hydrolytic enzyme beta‐galactosidase and thus it is a health and nutritional problem; second, it i…
Results of magnetization measurements on carefully prepared single crystals of Sm${\mathrm{Co}}_{5}$ are presented over the temperature range 4-970 K. The contribution of the rare-earth sublattice magnetocrystalline anisotropy was evaluated using the data on Y${\mathrm{Co}}_{5}$ as "a blank." These results are interpr…
A specific color reaction has been developed for the detection of N-7, N-8-(1,2-dihydroxycyclohex-1,2-ylene)-L-arginine-containing peptides. The reaction is based on the fact that hydroxylamine converts the blocking group to cyclohexanedione dioxime, which forms a red nickel complex. N-7, N-8-(1,2-dihydroxycyclohex-1,…
The cross-section for inelastic scattering of 80 keV electrons in thin films of evaporated carbon has been measured as a function of energy loss (from 10 to 600 eV) and scattering angle (up to 0·1 rad). The onergy-loss spectrum shows a broad peak around 24 eV, believed to arise mainly from plasmon oscillation of valen…
Monomer chromatin particles containing 140 base pairs of DNA and eight histone molecules have been studied by neutron scattering. From measurements in various H2O/D2O mixtures, radii of gyration and the average scattering density of the particle were determined. The radius of gyration under conditions when scattering…
Cobalt and Co‐Ni alloy were electrodeposited into the micropores of various kinds of anodic oxide films on aluminum. Fine granular metals precipitated on the barrier layer and formed columnar structures. Although the films of cobalt or nickel showed remarkable magnetic anisotropies perpendicular to the surface, the al…
A modified thiocarbohydrazide (TCH) technique to cross-link osmium layers has resulted in a reliable method for preparing a wide variety of soft biological tissues for scanning electron microscopy without the use of evaported metal. The technique works equally well on tissues with smooth surfaces and those with abrupt…
The model of pancreatic trypsin inhibitor determined by Huber, Kukla, Rtihlmann, Epp & Formanek [Naturwissenschaften (1970). 57, 389-392] was fitted to an electron-density map of 1.9 A resolution calculated with isomorphous-replacement phases by application of the real-space refinement procedure of Diamond [Acta Cryst…
The human body exchanges heat with its environment via radiation, convection, conduction and evaporation. Each of the heat exchange terms in the heat balance equation S = M-E-(+/- W)-C-R has been described in further detail as related to environmental conditions and to the effect of clothing. Such factors as air veloc…
An APS sponsored study reviewed the state of research and development in radiation effects on materials for the purpose of identifying basic scientific problems which limit progress in energy applications and which could be attacked by physicists, especially those in universities.The field of radiation effects on mate…