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  • 1
    Electronic Resource
    Electronic Resource
    Ammonium-nitrogen metabolism and nitrogen fixation in azotobacter vinelandii (1987)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 7 (1987), S. 555-562 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The probable effect of increasing levels of ammonium nitrogen on the growth, efficiency of nitrogen fixation, and main cellular constituents of Azotobacter vinelandii was studied under shaking and static culture conditions.The presence of NH4+-N up to 50 mgl-1 level has no harmful effect on the multiplication as well as the yield efficiency ratio of the tested organism. A. vinelandii was able to fix dinitrogen in the presence of NH4+-N when both nitrogen sources were available in the culturing medium. The efficiency of nitrogen fixation was affected by the initial presence of NH4+-N in the medium, it was quite low at the highest level. The crude protein efficiency ratio was correlated inversely with the initial NH4+-N concentration, whereas the total carbohydrate efficiency ratio as well as the total lipid efficiency ratio were positively correlated with the NH4+-N concentration. The presence of NH4+-N in the culturing medium has no essential influence on the qualitative composition of the amino acids in the Azotobacter cells.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370070617
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Biochemical studies on the effect of various carbon sources on growth, nitrogen fixtion, and main cellular constituents of azotobacter vinelandii, strain IV grown under various cultivation conditions (1987)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 7 (1987), S. 361-369 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The accessibility of different carbon compounds to Azotobacter vinelandii and the productivity of nitrogen fixation were studied under static and shaking culture conditions. The nature of the carbon source applied was found to affect the yield of bacterial mass and nitrogen metabolism of the tested organism. On the basis of the efficiency of dinitrogen fixation and the yield efficiency ratio it was obvious that (sucrose + mannitol) as a source of carbon is optimum for both growth and dinitrogen fixation by A. vinelandii grown under static and shaking culture conditions. Furthermore, it was found that the highest crude protein efficiency ratio (14.6) and total carbohydrates efficiency ratio (4.3) were obtained with (sucrose + mannitol) as energy source for this organism under shaking culture condition. The experimental organism is able to convert the soluble nitrogenus substances present in molasses into more complex protein as well as to utilize the molasses as a source of energy for the fixtion of atmospheric nitrogen. The tested organism was unable to utilize sodium salicylate as the sole source of carbon.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370070417
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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