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  • Electronic Resource  (5)
  • 1980-1984  (5)
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  • Electronic Resource  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Externally buffered enzyme electrode for determination of glucose (1984)
    s.l. : American Chemical Society
    Analytical chemistry 56 (1984), S. 1880-1884 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00275a028
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Oxygenation of immobilized cells using hydrogen-peroxide; a model study of Gluconobacter oxydans converting glycerol to dihydroxyacetone (1982)
    Springer
    Applied microbiology and biotechnology 14 (1982), S. 64-68 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The possibility of using hydrogen-peroxide as an oxygen source in immobilized whole cell systems was investigated. The conversion of glycerol to dihydroxyacetone performed by Ca-alginate immobilized Gluconobacter oxydans was used as a model system. The influence of basic parameters, such as pH, temperature and concentration of hydrogen-peroxide, on the conversion are reported. Continuous production using a packed bed could be substantially improved by using hydrogen-peroxide as a source of oxygen. The productivity was increased almost twenty-fold in the reactor. However, hydrogen-peroxide also caused deactivation of the oxidizing of the cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00498004
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Control of immobilized, non-growing cells for continuous production of metabolites (1983)
    Springer
    Applied microbiology and biotechnology 17 (1983), S. 143-147 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A technique for maintaining constant activity during continuous production with immobilized, non-growing cells has been developed. A single stage continuous system with alginate immobilized Clostridium acetobutylicum, was mainly fed with a glucose medium that supported fermentation of acetone-butanol but did not permit microbial growth. The inactivation that occured during these conditions was prevented by pulse-wise addition of nutrients to the reactor. Using this technique the ratio of biomass to butanol was reduced to 2% (w/w) compared to 34% in a traditional batch culture. At steady state conditions butanol was the major end product with a yield coefficient of 0.20 (g/g glucose). The productivity of butanol was 16.8 g/l·day during these conditions. In a corresponding system with immobilized growing cells the ratio of biomass to butanol was 52–76% and the formation of butyric and acetic acid increased thereby reducing the yield coefficient for butanol to 0.11 (g/g). With the intermittent nutrient dosing technique constant activity from immobilized non-growing cells has been achieved for 8 weeks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00505878
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Control of glucose-fed batch cultivations of E. coli by means of an oxygen stabilized enzyme electrode (1983)
    Springer
    Applied microbiology and biotechnology 18 (1983), S. 141-147 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The design of an autoclavable oxygen stabilized electrode based on immobilized glucose oxidase and catalase, with electrolytic generation of oxygen, is presented. The electrode's behaviour was investigated in relation to parameters such as ion strength, buffer capacity, DOT in the broth and enzyme inhibition by Cl−. It was used in fed-batch cultivations of Escherichia coli for control and monitoring of glucose feeding. Use of liquid feeding data from glucose- as well as from pH control for growth characterization is outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00498035
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A Process for large-scale isolation of β-galactosidase from E. coli in an aqueous two-phase system (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 1789-1800 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method suitable for large-scale isolation of β-galactosidase from a suspension of disintegrated E. coli cells has been developed. In an aqueous two-phase system consiting of PEG 6000 and potassium phosphate, all cell debris and the major part of the proteins and nucleic acids were partitioned to the denser salt phase. Seventy-five percent of the β-galactosidase was recovered in the lighter PEG phase, giving a purification ratio of about 12.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260250709
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    Paper (German National Licenses)
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