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  • 1
    Digitale Medien
    Digitale Medien
    Production of amino acids by Azospirillum Brasilense in chemically-defined medium amended with malate, gluconate or fructose
    Amsterdam : Elsevier
    Soil Biology and Biochemistry 26 (1994), S. 301-303 
    Details
    ISSN: 0038-0717
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0038-0717(94)90171-6
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of some herbicides on the production of lysine byAzotobacter chroococcum (1999)
    Springer
    Amino acids 17 (1999), S. 165-173 
    Details
    ISSN: 1438-2199
    Schlagwort(e): Amino acids ; Lysine ; Herbicides ; Azotobacter ; Xenobiotics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01361879
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  • 3
    Digitale Medien
    Digitale Medien
    Production of amino acids by free-living heterotrophic nitrogen-fixing bacteria (1995)
    Springer
    Amino acids 8 (1995), S. 15-21 
    Details
    ISSN: 1438-2199
    Schlagwort(e): Amino acids ; Azotobacter ; Azospirillum ; Biotechnology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Interest of microbial production of amino acids has been increased greatly since development of biotechnological methods. These methods represent a perspective way applied in a future large-scale manufacture of inexpensive amino acids. In this context, the isolation of producing organisms that may be exploited in the desing of alternative methods for the production of amino acids could be of primary importance. In this review we will describe the liberation of amino acids (methionine, lysine, arginine, tryptophane and glutamic acid) byAzotobacter andAzospirillum during growth in culture media with different carbon sources under diazotrophic and adiazotrophic conditions. These organisms may be useful in developing new methods for the industrial production of amino acids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00806540
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of Simazine on the production of lysine and methionine byAzotobacter chroococcum andAzotobacter vinelandii (1997)
    Springer
    Amino acids 12 (1997), S. 249-255 
    Details
    ISSN: 1438-2199
    Schlagwort(e): Amino acids ; Lysine ; Methionine ; Azotobacter ; Simazine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01373005
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  • 5
    Digitale Medien
    Digitale Medien
    Influence of Rhizobium/Azotobacter and Rhizobium/Azospirillum combined inoculation on mineral composition of faba bean (Vicia faba L.) (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 165-169 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Key words Azotobacter ; Azospirillum ; Rhizobium ; Vicia faba L. ; Legume inoculation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract  Mixed inoculation of Vicia faba L. with four different Rhizobium/Azospirillum and Rhizobium/Azotobacter combinations led to changes in total content, concentration and/or distribution of the mineral macro- and micronutrients, K, P, Ca, Mg, Fe, B, Mn, Zn and Cu, when compared with plants inoculated with Rhizobium only. The effects varied to a great extent among the Azotobacter and Azospirillum strains selected for combined inoculation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003740050540
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  • 6
    Digitale Medien
    Digitale Medien
    Effect of the insecticide methidathion on agricultural soil microflora (1992)
    Springer
    Biology and fertility of soils 13 (1992), S. 173-175 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Methidathion ; Soil microflora ; Enumeration of functional bacterial groups ; Acetylene reduction assay ; ARA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary We studied the effects of the organophosphorus insecticide methidathion, at concentrations of 10, 50, 100, 200 and 300 μg g-1 in an agricultural soil, on fungi, total bacterial populations, aerobic N2-fixing bacteria, denitrifying bacteria, nitrifying bacteria (phases I and II), and nitrogenase activity (acetylene reduction assay). The presence of 10–300 μg g-1 of methidathion significantly increased fungal populations (colony-forming units). Denitrifying bacteria, aerobic N2-fixing bacteria and N2 fixation were significantly increased at concentrations of 50–300 μg g-1. The total number of bacteria increased significantly at concentrations of 100–300 μg g-1. Nitrifying bacteria decreased initially at concentrations of 300 μg g-1, but recovered rapidly to levels similar to those in the control soil without the insecticide.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00336275
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  • 7
    Digitale Medien
    Digitale Medien
    Production of vitamins by Azospirillum brasilense in chemically-defined media (1993)
    Springer
    Plant and soil 153 (1993), S. 97-101 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Azospirillum brasilense ; soil bacteria ; vitamin production
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The production of vitamins by Azospirillum brasilense was studied in chemically-defined media amended with malate, gluconate and fructose. The liberation of vitamins was significantly affected by the presence of different carbon sources and the age of the culture. Thiamine, niacin and pantothenic acid were produced in large amounts. Thiamine and riboflavin were produced only in culture containing malate or fructose. Biotin was not detected in the supernatants of the culture media.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00010548
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  • 8
    Digitale Medien
    Digitale Medien
    Effect of the insecticides methylpyrimifos and chlorpyrifos on soil microflora in an agricultural loam (1992)
    Springer
    Plant and soil 147 (1992), S. 25-30 
    Details
    ISSN: 1573-5036
    Schlagwort(e): chlorpyrifos ; insecticides ; methylpyrimifos ; organophosphorus ; soil microflora
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract A study of the effects of two selected organophosphorus insecticides methylpyrimifos and chlorpyrifos on soil microflora in an agricultural loam was made. The insecticides had concentrations of 10 to 300 μg g−1. The presence of methylpyrimifos at concentrations of 100 to 300 μg g−1 or chlorpyrifos at concentrations from 10 to 300 μg g−1 significantly decreased aerobic dinitrogen fixing bacteria and dinitrogen fixation. Nitrifying bacteria decreased at concentrations of 200 and 300 μg g−1 of methylpyrimifos. The presence of 10 to 300 μg g−1 of chlorpyrifos decreased the total number of bacteria. However, fungal populations and denitrifying bacteria were not affected as a consequence of the addition of the organophosphorus insecticides to the agricultural soil, showing that these microorganisms can tolerate high amounts of those insecticides.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00009367
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  • 9
    Digitale Medien
    Digitale Medien
    Response of Azospirillum brasilense to the pesticides bromopropylate and methidathion on chemically defined media and dialysed-soil media (1998)
    Springer
    Ecotoxicology 7 (1998), S. 43-47 
    Details
    ISSN: 1573-3017
    Schlagwort(e): Azospirillum brasilense ; bromopropylate ; methidathion ; media ; pesticides ; xenobiotics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The effects of 10, 50, 100, 200 and 300 mu g ml-1 of bromopropylate and methidathion were investigated in the cells of Azospirillum brasilense grown in chemically defined media and dialysed-soil media. The insecticide bromopropylate did not affect microbial growth, the levels of ATP and dinitrogen fixation of A. brasilense in either chemically defined media or dialysed-soil media. Methidathion significantly reduced dinitrogen fixation, the intracellular levels of ATP and growth in cells grown in chemically defined media. However, these negative effects were not significant in cells grown in dialysed-soil media, showing that A. brasilense can tolerate high concentrations (300 mu g ml-1) of methidathion under the present experiment conditions
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008807701523
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  • 10
    Digitale Medien
    Digitale Medien
    Effects of the herbicide alachlor on soil microbial activities (1994)
    Springer
    Ecotoxicology 3 (1994), S. 4-10 
    Details
    ISSN: 1573-3017
    Schlagwort(e): Alachlor ; herbicides ; pesticides ; soil bacteria ; enzymatic activities
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: A study was made of the effects of one selected acetanilide herbicide, alachlor, at concentrations of 2.0–10.0 kg ha−1 on bacterial populations, fungi, dinitrogen fixation bacteria, denitrifying bacteria, nitrifying bacteria, nitrogenase activity, acid and alkaline phosphatases, arylsulfatase and deshydrogenase. The presence of 2.0–10.0 kg ha−1 of alachlor in the soil increased the total number of bacteria and fungi. The population of denitrifying bacteria increased significantly at concentrations of 5.0–10.0 kg ha−1. However, aerobic dinitrogen fixing bacteria and nitrogenase activity decreased at alachlor concentrations of 3.5–10.0 kg ha−1. Acid and alkaline phosphatases, arylsulfatase and dehydrogenase activity decreased significantly initially at concentrations of 5.0–10.0 kg ha−1, but recovered to levels similar to those in the control. Nitrifying bacteria were not affected as a consequence of the addition of the herbicide to agricultural soil.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00121384
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