Materials Literature
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Porous silicon film (PSF) on silicon was formed by anodic reaction in 50 weight percent (w/o) hydrofluoric acid. Effects of parameters on the PSF formation rate, density, crystalline structure, and cross section structure have been studied. Current density and acceptor concentration in p‐type silicon PSF formation, as…
Differential thermal analysis, differential scanning calorimetry, pulsed nuclear magnetic resonance spectroscopy, and low temperature microscopy are utilized to investigate low temperature freezing points or exotherms which occur near -40 C in the xylem of cold-acclimated shagbark hickory (Carya ovata L.). Experiments…
Solubilization of collagen from bovine articular with pepsin requires the preliminary extraction of proteoglycans from the ground substance. Biochemical and physiochemical properties of this pepsin-solubilized collagen are independent of the pretreatment (extraction with 1.5M-CaCl2, 5M-guanidinium chloride or 0.2M-NaO…
Article Cobaltous Oxide Point Defect Structure and Non-Stoichiometry, Electrical Conductivity, Cobalt Tracer Diffusion was published on February 1, 1977 in the journal Zeitschrift für Physikalische Chemie (volume 107, issue 2).
Collagens in normal human liver and in alcoholic cirrhotic liver were investigated. Collagens were solubilized by limited proteolysis with pepsin under nondenaturing conditions, and after purification, were fractionated into types I and III by selective precipitation with NaCl. After carboxymethyl cellulose and agaros…
Abstract The melting point of the 1:1 copolymer of ethylene and CO is 244°C. It falls rapidly as the percent CO is reduced indicating that the heat and entropy of fusion are 0.60 kcal and 1.15 e.u./mol of chain atoms, respectively. These are lower than the values for polyethylene. Dynamic mechanical measurements showe…
Low-power loss and high-power threshold properties have been measured between 3.0 and 17.2 GHz on three Li-Ti ferrite compositions of magnetizations 1250, 2250, and 3600 G. In each composition the use of cobalt resulted in a linear increase in mu/sub 0/ and h/sub crit/. Temperature measurements were performed at 9.2 G…
The activation energy for conduction, the optical energy gap and the slope of the exponential tail of the optical absorption were measured for As x Te 90- x Ge 10 and As 35 Te 55 Ge 10- x Si x glasses and their composition dependences were studied. It was found that there exist some correlations among the compositiona…
Abstract The Maungaparerua halloysite deposit is located on the North Island of New Zealand some 210 km north of Auckland. The halloysite deposit was formed by hydrothermal alteration of rhyolite flow rocks. Superimposed on the hydrothermally altered halloysite is deep intensive surficial weathering resulting from the…
Abstract The thermomechanical spectra of a series of elastoplastic polyether–ester copolymers were determined at 110 Hz and between −120°C and 200°C at five compositions. Emphasis was given to samples containing an increasing amount of poly(tetramethylene terephthalate) constituting the hard segment in these copolymer…
The principal magnetic susceptibilities of Ni${\mathrm{Nb}}_{2}$${\mathrm{O}}_{6}$ were measured from ambient down to 1.4 K. At ${T}_{N}=6.0\ifmmode\pm\else\textpm\fi{}0.3$ K an antiferromagnetic ordering was observed. An antiferromagnetic-paramagnetic phase transition was induced by external magnetic fields parallel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of three-coordinate nickel(I): electron paramagnetic resonance of nickel-doped halobis(triphenylphosphine)copper(I)Mark J. Nilges, E. Kent Barefield, R. Linn Belford, and Phillip H. DavisCite this: J. Am. Chem. Soc. 1977, 99, 3, 755–760Publication Date (…
The ionic conductivity of CuI has been measured as a function of temperature between 100° and 470°C using the a‐c method. The measurements have been made on a pure sample and also on samples doped with CdI 2 in concentrations between 0.02 and 0.50 mole percent (m/o). The results have been analyzed using Koch and Wagne…
Abstract A modification of tridymite with an orthorhombic structure exists between monoclinic low tridymite and orthorhombic high tridymite. The three unit-cell edges of this structure are parallel with the corresponding ones of orthorhombic high tridymite but the a translation is three times as long as that of the la…
Ac tree starting voltage of low density polyethylene has been found to be higher at liquid nitrogen temperature (42kV) than that at room temperature (7kV) and it is almost equal to the positive impulse tree starting voltage. This improvement may be due to either the partial-discharge free contact of the interface betw…
The high temperature heat contents, HT -H 298 , ~f two FeO-rich synthetic silicate glasses and five glasses and three supercooled I iquids prepared from igneous rocks ranging from basalt to rhyolite have been measured by drop calorimetry. Data for the two synthetic glasses are combined with published heat content dete…
<div class="htmlview paragraph">A survey of recent studies and research on methanol is given within the historical context. Fuel related properties are reviewed and compared with isooctane. Combustion emissions and their variation with temperature and fuel preparation are similarly compared. Uses of methanol as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins. 34. Phosphorus complexes of octaethylporphyrinPhillip Sayer, Martin Gouterman, and Charles R. ConnellCite this: J. Am. Chem. Soc. 1977, 99, 4, 1082–1087Publication Date (Print):February 1, 1977Publication History Published online1 May 2002Published inissue 1 Febr…
Galactokinase (EC 2.7.1.6; ATP:D-galactose-1-phosphotransferase) was purified to homogeneity with a 50% yield from cells of Saccharomyces cerevisiae which were fully induced for the production of the galactose metabolizing enzymes. The purification was accomplished by:(a) ammonium sulfate fractionation, (b) streptomyc…
Abstract Oriented gels, obtained by high supercoolings of isotactic polystyrene solutions, exhibit unexpected “fiber‐type” x‐ray diffraction patterns. In particular a pronounced meridional reflection at a spacing of 0.51 nm, together with its successive orders, requires an extended, or nearly extended, chain conformat…