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  • 1
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der antimikrobiellen Wirkung der Sorbinsäure (1964)
    Springer
    Naturwissenschaften 51 (1964), S. 13-14 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00601725
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  • 2
    Electronic Resource
    Electronic Resource
    Die Wirkung subletaler Konzentrationen von Sorbinsäure auf Escherichia coli und Aspergillus niger (1963)
    Springer
    Naturwissenschaften 50 (1963), S. 456-456 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00601617
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  • 3
    Electronic Resource
    Electronic Resource
    Formation and degradation of Δ9-1,18-octadecenedioic acid from oleic acid by Candida tropicalis (1988)
    Springer
    Applied microbiology and biotechnology 28 (1988), S. 520-526 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The formation and degradation of Δ9-1,18-octadecenedioic acid from oleic acid by mutant S 76 of Candida tropicalis was studied. It was found that the mutant could convert oleic acid to Δ9-1,18-octadecenedioic acid by ω-oxidation of the terminal methyl group. The substance was identified by various analytical methods and could be degraded to unsaturated dioic acids of shorter chain length with even numbers of carbon atoms from 6 to 16, and saturated dioic acids with 6, 8 and 10 carbon atoms. Neither unsaturated nor saturated dioic acids with odd numbers of carbon atoms were found in the media. From these results some metabolic pathways of the degradation of this unsaturated dioic acid are proposed. Some mass spectra of unsaturated dioic acids are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00250405
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  • 4
    Electronic Resource
    Electronic Resource
    Oxygen uptake of microorganisms entrapped in Ca-alginate (1986)
    Springer
    Applied microbiology and biotechnology 23 (1986), S. 163-167 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The oxygen uptake rates of Pseudomonas putida, Saccharomyces cerevisiae and Aspergillus niger, immobilized in Ca-alginate gel, were determined in comparison with the respiration of free cells. The specific oxygen uptake rate of immobilized microorganisms decreased with increasing cell content of the gel beads and increasing alginate concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261907
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  • 5
    Electronic Resource
    Electronic Resource
    Continuous penicillin production by Penicillium chrysogenum immobilized in calcium alginate beads (1987)
    Springer
    Applied microbiology and biotechnology 26 (1987), S. 215-218 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A high penicillin-producing Penicillium chrysogenum strain immobilized in calcium alginate beads was used for continuous penicillin fermentation in a bubble column and in a conical bubble fermentor. The fermentation was limited by the growth rate, dilution rates and the stability of the alginate beads. The immobilized cells lost their ability to produce penicillin in the bubble column after 48 h from beginning of the continuous fermentation. In the conical bubble fermentor the immobilized cells remained active for more than 7 days. This bioreactor ensured a good distribution of nutrients and oxygen as well as a higher mechanical stability of the alginate beads.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286311
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  • 6
    Electronic Resource
    Electronic Resource
    Exhaust gas purification using immobilised monocultures (biocatalysts) (1987)
    Springer
    Applied microbiology and biotechnology 26 (1987), S. 579-587 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The paper is concerned with the purification of exhaust gases using biocatalysts in a trickle bed reactor. Substance specific strains (monocultures) which were, for example, immobilised on activated carbon served as biocatalyst. Technically important solvents and substances such as aldehydes, methyl ethyl ketone and ethyl acetate were used as pollutants. Their concentration was about 5–40 ppm in the exhaust gas to be purified. The experiments show that with suitable bacterial, strains space velocities of about k *=1500 h-1 can be obtained at a conversion of 90%. The mass transfer through the liquid film around the activated carbon grains seems to be rate determining.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00253036
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  • 7
    Electronic Resource
    Electronic Resource
    Coupled reductive and oxidative degradation of 4-chloro-2-nitrophenol by a co-immobilized mixed culture system (1990)
    Springer
    Applied microbiology and biotechnology 34 (1990), S. 108-115 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The restriction of oxygen transfer in Ca-alginate beads used for the immobilization of microbial cells was applied to a coupled reductive and oxidative microbial degradation of the xenobiotic 4-chloro-2-nitrophenol (CNP). The conversion of CNP by Enterobacter cloacae under anaerobic conditions led to the formation of 4-chloro-2-aminophenol (CAP, 81%) and 4-chloro-2-acetaminophenol (CAAP, 16%) after 50 h incubation. CAP, the main reduction product, was further degraded under aerobic conditions by Alcaligenes sp. TK-2, a hybrid strain isolated by conjugative in-vivo gene transfer. Whereas both degradation steps excluded one another in homogeneous systems with free cells, a coupled reductive and oxidative degradation of CNP was observed in one aerated reactor system after co-immobilization of both strains in Ca alginate. The diameter of the alginate beads used for immobilization was recognized as one main factor determining the properties of this mixed culture system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170933
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  • 8
    Electronic Resource
    Electronic Resource
    Relationship between fermentation capability and fatty acid composition of free and immobilized Saccharomyces cerevisiae (1991)
    Springer
    Applied microbiology and biotechnology 34 (1991), S. 502-508 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The fatty acid composition of Saccharomyces cerevisiae immobilized by entrapment in calcium-alginate beads or adsorption on sintered glass was compared to that of freely suspended cells under different fermentation conditions. The fermentation product ethanol was found to cause a shift towards saturation in the fatty acid composition under anaerobic conditions. Immobilized cells contained significantly higher percentages of saturated fatty acyl residues, especially of palmitic acid (16:0), and a decreased amount of oleic acid (18:1) compared with free cells. The percentage saturation of total fatty acid composition correlates positively with improved fermentation rates obtained with the immobilized cells. This enhanced saturation of fatty acid composition in immobilized cells may be due to altered osmotic conditions in the microenvironment of the cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180578
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  • 9
    Electronic Resource
    Electronic Resource
    Physiology of polyol formation by free and immobilized cells of the osmotolerant yeast Pichia farinosa (1991)
    Springer
    Applied microbiology and biotechnology 35 (1991), S. 258-263 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Some physiological data of cells of Pichia farinosa immobilized on sintered glass Raschig rings were compared with data from free cells. Glucose consumption and productivity of total polyols (arabitol, glycerol and erythritol) showed a simultaneous “inter-lag” phase. Enzymes that catalyse steps of the pentosephosphate pathway (glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, transaldolase and polyol dehydrogenase) showed a distinct increase after transfer of the cells into production medium. The activity of glycerol-3-phosphate dehydrogenase was generally low. Only alcohol dehydrogenase presented the inter-lag phase mentioned above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00184698
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  • 10
    Electronic Resource
    Electronic Resource
    Biodegradation of 4-chlorophenol by adsorptive immobilized Alcaligenes sp. A 7-2 in soil (1991)
    Springer
    Applied microbiology and biotechnology 35 (1991), S. 662-668 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Alcaligenes sp. A 7-2 immobilized on granular clay has been applied in a percolator to degrade 4-chlorophenol in sandy soil. Good adsorption rates on granular clay were achieved using cell suspensions with high titres and media at pH 8.0. The influence of various parameters such as aeration rate, pH, temperature, concentration of 4-chlorophenol and size of inoculum on the degradation rate were investigated. During fedbatch fermentations under optimal culture conditions, concentrations of 4-chlorophenol up to 160 mg·1−1 could be degraded. Semicontinuous culture experiments demonstrated that the degradation potential in soil could be well established and enhanced by the addition of immobilized bacteria. Continuous fermentation was performed with varying 4-chlorophenol concentrations in the feed and different input levels. The maximum degradation rate was 1.64 g·1−1·day−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00169634
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