Materials Literature
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Twenty-one species (23 isolates) of marine diatoms were examined for their capacity to utilize analogs of cyanocobalamin for growth at the ecologically significant concentration of 4 ng 1-(1) . Yields due to the analogs were compared to those produced by B12 . Responses of the various clones to the analogs were not al…
The Arbuzov reaction of cotton fabric containing the haloacetamidomethyl groups Cell-OCH 2 NHCOCH 2 X (X=I, Br, Cl) has been studied systematically to prepare new cellulose phosphonate ester derivatives. Comparison of flame-retardant properties of the phosphonate derivatives with those of fabric containing a deposited…
Epitaxial twinned single-crystal films of copper have been grown on sapphire substrates by high vacuum evaporation in the temperature range 240–-375°C. The presence of a twin relationship in copper deposited on the basal plane of sapphire was demonstrated and evaluated by x-ray diffraction techniques. The epitaxy has…
Abstract In the last few years several reviews and books have been published on the aging of elastomers, but the overall view which they present of the oxidation of natural rubber and its vulcanizates still contains many puzzling features. Two of these are the variation of antioxidant efficiency in different types of…
Abstract The first synthetic rubber manufactured in the United States was of the polysulfide type. In 1927 Patrick and Mnookin had obtained the first of a series of patents on the products from the reaction of organic dihalides and inorganic polysulfides. Production was started in Kansas City in 1929 with the first of…
Polymer dielectric films, ranging in thickness from less than 100 A to several microns, have become increasingly useful for basic investigations of surface phenomena and thin film electrical conductivity and for thin film electronic device and circuit development. The preparation and characterizing properties of thin…
Liquid silicates, in common with phosphates and probably other oxygen‐containing inorganic polymers which are stable at high temperatures, contain in general a multitude of anionic species ranging in size and complexity from simple “monomeric” groupings such as SiO 4 4− and P0 4 3− to continuous, cross‐linked networks…
Ultrasonic shear and longitudinal measurements were made in Bz03 from 650° to 1000° C. From these data both the shear and volume relaxation time spectra were determined. The spectra had the same temperature dependence, although the volume spectrum was always broader than the shear spectrum. The shear relaxation proces…
The dielectric constant and loss of eight isomeric octanols has been measured over a wide range of temperature and frequency. Two distinctly different types of dispersion loci are found: For those alcohols whose –OH group is so sterically hindered that association into linear chains is unfavorable, a very small, very…
"Mathematical Theory of Elementary Particles." Nuclear Science and Engineering, 31(3), p. 555
PbTiO 3 ceramics with high density and high resistivity have been prepared by adding less than 5 mol % of Bi 2/3 TiO 3 , PbZn 1/3 Nb 2/3 O 3 or their derivatives. These ceramics have dielectric constants of about 200, and can be poled at 200°C under a d. c. field of 40 to 70 kV/cm. The piezoelectric coupling factors k…
This two‐part paper develops a basis for discussing glass properties which has features in common with standard “actual vs. ideal” treatments of physicochemical behavior, by defining thermodynamically an ideal state for the glass and discussing the states of the actual glasses in terms of their “departures from ideali…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe spectral and magnetic properties of copper(II)cyanoacetateJohn R. Wasson, Chin-I Shyr, and Charles TrappCite this: Inorg. Chem. 1968, 7, 3, 469–473Publication Date (Print):March 1, 1968Publication History Published online1 May 2002Published inissue 1 March 1968https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized Infrared Studies of Amorphous Orientation in Polyethylene and Some Ethylene CopolymersB. E. Read and R. S. SteinCite this: Macromolecules 1968, 1, 2, 116–126Publication Date (Print):March 1, 1968Publication History Published online1 May 2002Published inissue 1 Marc…
Dynamical aspects of the ferroelectric phase transition in KH 2 PO 4 -type crystals are elucidated on the basis of the coupling between the proton tunneling mode and the optical mode vibration of the [K-PO 4 ] complexes along the c-axis. Two coupled modes are obtained within the framework of a linear theory. The mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilanol Groups on Silica and Their Reactions with Trimethyl Chlorosilane and TrimethysilanolW. J. EakinsCite this: Ind. Eng. Chem. Prod. Res. Dev. 1968, 7, 1, 39–43Publication Date (Print):March 1, 1968Publication History Published online1 May 2002Published inissue 1 March 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromism. Spectroscopy and photochemistry of pyran and thiopyran derivativesRalph Sherman Becker and Jaroslav KolcCite this: J. Phys. Chem. 1968, 72, 3, 997–1001Publication Date (Print):March 1, 1968Publication History Published online1 May 2002Published inissue 1 March…
Abstract The coagulation of viscous polymer solutions by diffusional interchange with a liquid bath is the key step to fiber formation by wet‐spinning. Model experiments were performed on gelled solutions of an acrylic polymer in dimethylacetamide, to determine the mass‐transfer rates of solvent and nonsolvent (water)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHypersensitive transitions of hydrated neodymium-(III)holmium-(III) and erbium-(III) ionsDavid G. KarrakerCite this: Inorg. Chem. 1968, 7, 3, 473–479Publication Date (Print):March 1, 1968Publication History Published online1 May 2002Published inissue 1 March 1968https://pubs…
The progressive intercalation of graphite by potassium has been studied by x-ray diffraction methods. It has been established that potassium graphites of stages 4, 3, 2 and 1 (with intercalated potassium layers separated by 4, 3, 2 and 1 graphite layers respectively) can be formed successively within a single graphite…