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  • 11
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Zugabe von Montmorillonit zu Kulturlösungen verschiedener Mikroorganismen ergab bei Schüttel- oder Standkulturen meist eine Steigerung der Biomasse und einen erhöhten Nährstoffverbaruch. Diese Steigerung wurde besonders unter aeroben Verhältnissen und in den ersten Wachstumsphasen beobachtet. Die Bildung von Äthanol durch S. cerevisiae bzw. Citronensäure durch A. niger war beschleunigt, aber nicht wesentlich erhöht. Manometrische Messungen mit S. cerevisiae ergaben in Abhängigkeit von der Montmorillonit-Konzentration einen höheren RQ. Die Relation der Biomasse zu verbrauchter Glucose deutet auf eine bessere Ausnutzung der Energiequelle für synthetische Prozesse hin.
    Notes: Summary The addition of montmorillonite to stationary and shake-cultures of various microorganisms usually increased total biomass formation and accelerated the utilization of nutrients. These effects were noted especially under aerobic conditions and during the initial growth phases. The formation of ethanol by S. cerevisiae and citric acid by A. niger was accelerated, but not significantly increased. manometric measurements with S. cerevisiae showed a higher RQ which increased with increasing montmorillonite concentrations. The relation between biomass formation and glucose consumption indicates a more efficient utilization of the energy source for synthetic processes.
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  • 12
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A mixed population of microorganisms isolated from the municipal garbage compost was cultivated in a full nutrient liquid medium under aerobic conditions. In order to simulate the presence in compost of both noncolloidal and colloidal solid particles, glass beads, bentonite, or humic acid were added to the cultures. The growth of microorganisms and the CO2 evolution rose with bentonite and humic acid, but the humic acid did not enhance the growth of the potential pathogenic bacteria. Solid particles appreciably influenced the endurance to heat stress of microorganisms supporting their adaptation to the changed temperature.
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  • 13
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Growth of Aspergillus niger and Cladosporium herbarum occurred in shake cultures with polyurethane as the sole nutrient source. Simultaneously, the isocyanate almost completely disappeared from the polyurethane as determined with an IR-spectroscope. Otherwise, no structural changes were found in the polyurethane, though both fungi penetrated into the resilient foam tested.
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The tyrosinases from Agaricus bisporus and Streptomyces eurythermus, laccases from Polyporus versicolor and Pleurotus ostreatus, and peroxidase from horseradish were strongly adsorbed on different bentonites and a clay-humus complex but less to on kaolinite and quartz. The adsorption was significantly dependent on the pH, reaching maxima in the range of the specific isoelectric points; it was less influenced by the valency and type of exchangeable cations. Most of the enzymes lost their activity when adsorbed on bentonite. The activity of desorbed enzymes was distinctly diminished when compared with free enzyme preparations. Conclusions from this behaviour were drawn as to the possible use of phenoloxidases as agents to transform phenolics in soil.
    Type of Medium: Electronic Resource
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