Materials Literature
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The oxidation of UDP-glucose by the enzyme UDP-glucose dehydrogenase (EC 1.1.1.22) from beef liver has been shown to proceed via the enzyme-bound intermediate, UDP-alpha-D-glyco-hexodialdose. The enzyme does not release this aldehyde, nor can it be trapped by reaction with hydroxylamine, thiosemicarbazide, or cyanide.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of bis(2-pyridine sulfinato)copper(II)Lois S. Higashi, Munime. Lundeen, Ernst. Hilti, and Karl. SeffCite this: Inorg. Chem. 1977, 16, 2, 310–313Publication Date (Print):February 1, 1977Publication History Published online1 May 2002Published in…
Abstract Starch‐ g ‐polystyrene copolymers have been prepared by the simultaneous 60 Co‐irradiation of starch–styrene mixtures, and copolymers have been characterized with respect to weight per cent polystyrene (% add‐on) and also the molecular weight and molecular weight distribution of polystyrene grafts. In a typic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome Characteristics of Two-Phase Flow in Monolithic Catalyst StructuresCharles N. Satterfield and Fahri ÖzelCite this: Ind. Eng. Chem. Fundamen. 1977, 16, 1, 61–67Publication Date (Print):February 1, 1977Publication History Published online1 May 2002Published inissue 1 Febr…
DSC thermograms show that PET fibers upon thermal treatment develop an endotherm peak between 130°C and 234°C, depending on the temperature and the time of the treatment. The available experimental data suggest strongly that the middle endotherm peak (MEP) is the result of melting of very small crystallites (nuclei) l…
The design, construction and operation of a low-energy, high-resolution electron impact spectrometer are described. Emphasis is given to the means by which a practical hemispherical deflector can be made to approach its hypothetical optimum performance. Attention is also given to the design of the accompanying electro…
The apparent effective charge Z**Cu, of copper in aluminum was measured using a quasi-steady-state technique. Z**Cu was measured in the temperature range 325–500 °C at several current densities. The measured values ranged between −4.1 and −14.9. No clear current density or temperature dependence could be seen, except…
Abstract For narrow band metals the distortions of the form of X‐ray and X‐ray photoelectron spectra are investigated under the influence of the vacancy on the inner level. A calculation method over the whole energy interval of the distoring influence of the hole field is proposed and realized numerically. The site fo…
A traditional search for solidlike singlet densities in a system with a fluidlike pair distribution function is undertaken. The analysis is based upon a nonlinear integral equation relating the direct correlation function and the singlet density in contrast with previous analyses based upon similar relations between t…
The correlation factor, f, the vacancy availability factor, V, and the jump frequency factor, W, for diffusion of sodium ions in β″-alumina have been calculated as functions of composition and temperature through the application of a Monte Carlo method to a model of nearest neighbour interactions. The results for V an…
We have measured the second order β and third order γ hyperpolarizabilities of the three charge transfer complexes pyridine+I2, pyridine+ICl, and 4-aminopyridine+I2. Using Mulliken’s charge transfer theory we have been able to understand theoretically the large magnitude and absolute sign of these hyperpolarizabilitie…
The phase transition of KH 3 (SeO 3 ) 2 , was studied by ultrasonic velocity measurements at 5 and 10 MHz together with X-ray diffraction measurement and pyroelectric examination. It was clarified that the crystal below the transition point ( T c ) is nonferroelectric and belongs to the centrosymmetric space group P2…
Abstract Prior studies of two series of segmented polyurethanes based on 2, 4 toluene cliisocyanate (2, 4 TDI) or 2, 8 TDI, butanediol, and a 1000 molecular weight polytetramethyleneoxide (PTMO‐1000) soft segment revealed a rapid increase in soft segment glass transition temperature ( T g ) with increasing urethane co…
The technique of time-resolved fluorescence line narrowing has been applied to the $^{3}P_{0}$ state in La${\mathrm{F}}_{3}$:${\mathrm{Pr}}^{3+}$ Investigations included not only the low-concentration limit, but also samples of higher concentration. By sampling the fluorescence signal very shortly after the excitation…
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…