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  • 1975-1979  (2)
  • 1977  (2)
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  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    THe effect of 2,4-dichlorophenoxyacetic acid on growth and nitrogen-fixation of blue-green algaAnabaenopsis Raciborskii (1977)
    Springer
    Archives of environmental contamination and toxicology 5 (1977), S. 437-445 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Sodium salt of 2,4-dichlorophenoxyacetic acid (80% active ingredient), commonly applied for the control of aquatic weeds, was used to observe its effect on the growth and nitrogen fixation of a heterocystous bloom forming blue-green algaAnabaenopsis raciborskii. A concentration of 10Μg per ml of 2,4-D showed stimulation of growth and nitrogen fixation and these were almost unaffected in presence of its 100Μg per ml in the medium. The alga could tolerate up to 800Μg per ml in liquid culture media with and without nitrate nitrogen and up to 90Μg per ml on to agar plates. Nitrogen fixation was inhibited in presence of its higher concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220923
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A thermogravimetric study of the oxidation of CuFeO2 (1977)
    Springer
    Journal of materials science 12 (1977), S. 1903-1908 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation kinetics of CuFeO2 have been studied between 500 and 1000° C under various oxygen partial pressures using thermogravimetric analysis (TGA). The oxidation rate was found to increase as the oxygen partial pressure was increased, and for a given partial pressure of oxygen it was found to be maximum at ∼700° C. The enthalpy and activation energy for the oxidation of CuFeO2 were calculated to be ∼26.6±2 and ∼18±2 kcal mol−1 respectively. The oxidation of CuFeO2 resulted in the formation of CuFe2O4 and CuO, and the rate of reaction followed an S-type curve as found in the pearlitic transformation in steels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566252
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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