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  • 1
    ISSN: 1438-2199
    Keywords: Amino acids ; Lysine ; Herbicides ; Azotobacter ; Xenobiotics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Production of lysine byAzotobacter chroococcum strain H23 was studied in chemically-defined media amended with different concentrations of alachlor, metolachlor, 2,4-D, 2,4,5-T and 2,3,6-TBA. The presence of 5, 10, and 50μg/ml of alachlor or 2,3,6-TBA significantly decreased quantitative production of lysine. However, the presence 2,4-D or 2,4,5-T at concentrations of 10 and 50μg/ml enhanced the production of lysine. Quantitative production of lysine was not affected as consequence of the addition of metolachlor to the culture medium, showing that the release lysine to the culture media byA. chroococcum was not affected by that herbicide.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1438-2199
    Keywords: Amino acids ; Lysine ; Methionine ; Azotobacter ; Simazine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Production of lysine and methionine byAzotobacter chroococcum strain H23 andA. vinelandii strain ATCC 12837 was studied in chemically-defined medium and dialysed-soil medium, amended with different concentrations of Simazine. Responses on production due to Simazine were different for each strain and were fairly conditioned by culture media composition. Quantitative production of amino acids was significantly affected by the xenobiotic only at higher doses (50–100,μg/ml). The effect of Simazine on methionine production by strain H23 was very pronounced when bacteria were grown in dialysed-soil medium, which was specially formulated to reproduce the natural habitat of the organisms.
    Type of Medium: Electronic Resource
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