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  • 1
    ISSN: 1573-5036
    Keywords: Atmosphere ; Selenium ; Sulfur ; Sulfur dioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A native northern mixed prairie, Montana, U.S.A., was exposed to three controlled levels of sulfur dioxide and subplots fertilized with sulfur and/or selenium. Plant species that accumulated relatively greater quantities of soil sulfur did not necessarily accumulate relatively greater quantities of atmospheric sulfur, andvisa versa. Plant-sulfur concentrations increased with increasing time and level of exposure, but the rate of increase in plant-sulfur concentrations decreased with increasing SO2 concentration. Plants exposed to the high-SO2 concentration tended to have lower sulfur concentrations when growing in the sulfur-or the selenium-fertilized plots. High soil selenium caused a reduction in plant-sulfur content, but a decrease in plant selenium concentration with high soil sulfur could be detected only when comparing plants on the selenium and sulfur plus selenium plots, where high plant selenium concentrations were encountered.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 15 (1975), S. 646-650 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The dynamic mechanical properties of a series of thermoplastic urethane elastomers have been studied as a function of molecular composition and temperature. Polymers based on polycaprolactone diol, an isomeric mixture of tolylene diisocyanate and hydrogenated Bisphenol-A as the chain extender were prepared at various relative concentrations of hard and soft segments. The glass transition temperatures of these polymers progressively shifted to higher temperatures as the relative hard segment content was increased. This variation was accurately described by the Fox relationship for amorphous copolymers. These results can be interpreted in terms of the relative degree of segregation between the segment of the block copolymers.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 5 (1967), S. 625-628 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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