Materials Literature
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Age-related changes in human dermal elastic fibres were studied by scanning (SEM) and transmission (TEM) electron microscopy. The SEM findings showed an increase in the complexity of shape and arrangement of the fibres including flattening and branching, an increase in the roughness of the surface, and a decrease in i…
A photoelectrochemical method for etching p-GaAs is reported. The method overcomes the apparent stability of GaAs to reductive decomposition by switching the potential of the p-GaAs between a value at which photogenerated electrons reduce the surface to Ga and As3−, and a more positive value at which the majority carr…
The transformation on heating of an ordinary (helical) cholesteric liquid crystal (CHOL) into the isotropic phase (ISO) often occurs via a number of intermediate "blue" phases. We find the following scheme of phase transitions in cholesteryl nonanoate: $\mathrm{CHOL}\underset{91.35}{\ensuremath{\rightarrow}}\mathrm{BP…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrolytic polymerization of chromium(III). 1. Two dimeric speciesMary Thompson and Robert E. ConnickCite this: Inorg. Chem. 1981, 20, 7, 2279–2285Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https://pubs.acs…
A planar magnetron with a zinc target is used to sputter zinc oxide in an oxygen atmosphere. Highly oriented zinc oxide films are obtained on a variety of subtrates such as gold, aluminum, platinum, quartz, and oxidized silicon. The sputtering rate is typically 10–20 μm/h for a substrate temperature of 450–500 °C, a s…
High‐density Si 3 N 4 +6% CeO 2 composites with 5 to 50% BN were fabricated by hot‐pressing. BN remained as a discrete phase. Dielectric constants were 4 to 8 and loss tangents were 0.0008 to 0.06 for the room temperature to 1100°C range for compositions with 10 to 50% BN. Thermal‐expansion values perpendicular to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompatibility of polymer mixtures containing novolac resinsS. R. Fahrenholtz and T. K. KweiCite this: Macromolecules 1981, 14, 4, 1076–1079Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https://pubs.acs.org/doi…
Abstract not Available.
The structure of rabbit skeletal muscle actin complexed with bovine pancreatic DNase I has been determined by x-ray crystallographic methods at 6-A resolution. The analysis was based on a new orthorhombic crystal form, space group P212121, with one complex in the asymmetric unit. Six isomorphous heavy-atom derivatives…
Smooth muscle myosin light chain kinase was purified from turkey gizzards. The enzyme was extracted from washed myofibrils and the final step of purification was affinity chromatography using calmodulin coupled to Sepharose 4B. The purified enzyme was characterized with respect to its physical, chemical, and kinetic p…
Abstract The chemical, physical, and mineralogical properties of Sable and Darmstadt soils were studied to determine the value of solum and subsolum material as mediums for plant growth. Sable silty clay loam from western Illinois has nearly ideal physical and chemical properties for plant growth, while the more weath…
X-ray phototelectron spectroscopy was used to determine the binding energies of the core electrons in Ag- or Cu-doped amorphous As 2 Se 3 films. Chemical shifts of the constituent elements indicate the electron transfer from Ag or Cu to As and Se upon doping. Charged defects are induced to As-Se bonds. The mechanism o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquidus temperatures in the calcium carbonate-calcium hydroxide-calcium oxide and calcium carbonate-calcium sulfate-calcium sulfide ternary systems. 1M. C. Fuerstenau, C. M. Shen, and B. R. PalmerCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 3, 441–443Publication D…
Abstract The microstructure of both GR and NR is comprised of cis -polyisoprene units, resulting in a physicochemical similarity between the two rubbers. However, the processing and vulcanizate properties of guayule and NR differ when the former is substituted in standard NR formulations. Since GR and NR do not contai…
The equilibrium oxygen pressures of Mn‐Zn ferrites with various oxygen/metal ratios were obtained at 1000° to 1400°C. The method used is the dependence of the lattice constant on oxygen content obtained in Mn ferrites and the relation between oxygen content and the equilibrium oxygen pressure found in Mn and Ni ferrit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTungsten(V)-oxo and tungsten(VI)-dioxo complexes with oxygen, nitrogen, and sulfur ligands. Electrochemical, infrared, and electron paramagnetic resonance studiesC. A. Rice, P. M. H. Kroneck, and J. T. SpenceCite this: Inorg. Chem. 1981, 20, 7, 1996–2000Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteroidal Sapogenins From Leaves of Cordyline SpeciesGerald Blunden, Jaffer A. Jaffer, Kenneth Jewers, and William J. GriffinCite this: J. Nat. Prod. 1981, 44, 4, 441–447Publication Date (Print):July 1, 1981Publication History Published online1 July 2004Published inissue 1 J…
ABSTRACT Transmission electron microscopy studies of protein foams revealed the presence of a layer of cross‐linked polypeptides at the surface of the film enveloping an air inclusion. Scanning electron microscopic examination of a whipped solution with high levels of ovomucin and without lysozyme showed that the prot…
The efficacy of the microelectrode cycle life index in predicting the influence of expander on the pasted electrode performance was carried out from the simultaneous testing of four lignosulfonate expanders by the microelectrode and pasted electrode. Expander was included in the test solution for the microelectrode an…
Many postulated nuclear reactor accidents result in dryout or film boiling within the nuclear core. To minimize fuel rod damage and potential rod failure, safe or lower cladding fuel temperatures must be reestablished by encouraging coolant-cladding contact. This process is commonly referred to as quenching or rewetti…