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  • 1
    Electronic Resource
    Electronic Resource
    Optimal experimental design for parameter estimation in unstructured growth models (1994)
    s.l. : American Chemical Society
    Biotechnology progress 10 (1994), S. 480-488 
    Details
    ISSN: 1520-6033
    Source: ACS Legacy Archives
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bp00029a005
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Coupling of microbial kinetics and oxygen transfer for analysis and optimization of gluconic acid production with Aspergillus niger (1986)
    Springer
    Bioprocess and biosystems engineering 1 (1986), S. 79-91 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Gluconic acid fermentation has been widely used for the analysis of various aspects of kinetics and gas liquid transfer of oxygen. Most of these studies are, however, restricted to processes with bacteria. Mathematical models for industrially important productions with fungi have not been elaborated. In the experimental part of this work computer coupled fermentations of gluconic acid production with Aspergillus niger NRRL 3 have been performed. Knowledge of the stoichiometric relationship in the key reaction (glucose oxidase) provides an excellent opportunity for on-line estimation of glucose, biomass and product gluconate from oxygen uptake and carbon dioxide evolution rates. Starting then from experimental observations on the pH-depending oxygen kinetics of gluconic acid formation and influences of product concentrations on the growth of Aspergillus niger a mathematical framework is developed in which the kinetics of growth and production are coupled with gas liquid oxygen transfer. The model can be successfully applied to simulations of the experimental results of gluconic acid fermentations with cyclic addition of glucose. An important aspect in the coupling of transport and microbial reaction in this model is the incorporation of the influence of sugar and gluconate on the solubility of oxygen and k La via changes of viscosities and molecular diffusivities. With the development of such a comprehensive model, it appears feasible to investigate the influence of various process conditions (sugar feeding, pressure, optimal pH profiles) and to study their possible impacts on the productivity of the overall process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387499
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  • 3
    Electronic Resource
    Electronic Resource
    Oxygen solubilities in fermentation fluids (1979)
    Springer
    Applied microbiology and biotechnology 8 (1979), S. 1-15 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Fermentation media consist of a large number of chemicals whose composition undergoes alteration during the course of fermentation. As a result of this, conventional methods and correlations for oxygen solubility measurement and prediction do not apply in these systems. Using a physical method, oxygen solubilities were measured in simulated chemical systems and in fermentation broths. Sugars, salts, and fermentation products were identified as major factors influencing oxygen solubility. Salt effect was correlated with electrical conductivity of the medium, which was easy to measure during fermentation. For mixtures and for fermentation medium, individual influences were found to be log-additive in accordance with Danckwerts (1970).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00510261
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    ULYSSES observations of energetic particle acceleration and the superposed CME and CIR events of November 1992 (1996)
    Springer
    Annales geophysicae 14 (1996), S. 400-410 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract During November 1992, a series of forward and reverse shocks passed the ULYSSES spacecraft. Spectral and anisotropy measurements are reported for protons and alpha particles between 0.28 and 6 MeV observed by the Energetic Particle Composition Experiment, data recorded by the Magnetometer Experiment and the high-energy (2.7-300 MeV) proton data from the Kiel Electron Telescope. An analysis of energetic particle, plasma and magnetometer data from ULYSSES has allowed a unique study of the corresponding arrival of fare particles, particles within a corotating interaction region and particles transported with a coronal mass ejection. We present an analysis of these data in terms of possible diffusive shock acceleration but conclude that this is likely to be incompatible with the short transit time of the particles. Shock drift acceleration of particles with energies 0.3 MeV/nucleon or solar acceleration followed by particle trapping behind the shock front are alternative possibilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-996-0400-4
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  • 5
    Electronic Resource
    Electronic Resource
    Recurrent variations of anomalous oxygen in association with a corotating interaction region (1996)
    Springer
    Annales geophysicae 14 (1996), S. 585-588 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The fluxes of anomalous oxygen (E ranging from 3.5-6.8 MeV/amu), as measured by the EPAC instrument on ULYSSES, show a recurrent variation with the solar rotation period, which is anticorrelated with the fluxes of particles accelerated at the shocks of a corotating interaction region (CIR), and correlated with the fluxes of galactic cosmic rays known to be modulated by the CIR. The amplitude of this variation is much higher than expected for galactic cosmic rays of the same rigidity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-996-0585-6
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  • 6
    Electronic Resource
    Electronic Resource
    In Vivo Analysis of Glucose-Induced Fast Changes in Yeast Adenine Nucleotide Pool Applying a Rapid Sampling Technique
    Amsterdam : Elsevier
    Analytical Biochemistry 214 (1993), S. 31-37 
    Details
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/abio.1993.1452
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  • 7
    Electronic Resource
    Electronic Resource
    Application of different polarimetric methods for the analysis of enzyme-catalyzed enantioselective reactions (1999)
    Springer
    Fresenius' journal of analytical chemistry 363 (1999), S. 738-743 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Identification of model parameters in kinetic equations requires the determination of reactant concentrations in the course of time. In the case of enzyme catalyzed enantioselective reactions, three different polarimetric methods were used for concentration measurements obtained in both initial rate experiments and under dynamically changing conditions. Two on-line methods for the determination of different numbers of chiral species and a more universal off-line method were applied. For the investigated substrate 5-benzylhydantoin and the enzyme hydantoinase it is shown, that the obtained polarimetric data are most suitable for identification of kinetic parameters. Furthermore, it is demonstrated that on-line data of only one conversion allow for an assessment of an enzyme with regard to its enantioselectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051283
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  • 8
    Electronic Resource
    Electronic Resource
    Potential of Thiobacillus ferrooxidans for waste gas purification. Part 1. Kinetics of continuous ferrous iron oxidation (1993)
    Springer
    Applied microbiology and biotechnology 40 (1993), S. 416-420 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Kinetic data of ferrous iron oxidation by Thionacillus ferrooxidans were determined. The aim was to remove H2S (〈0.5 ppm) from waste gas by a process proposed earlier. Kinetic data necessary for industrial scale-up were investigated in a chemostat airlift reactor (dilution rate 0.02–0.12 h−1; pH 1.3). Due to the low pH, ferric iron precipitation and wall growth could be avoided. The maximum ferrous iron oxidation rate of submersed bacteria was 0.77 g 1−1 h−1, the maximum specific growth rate about 0.12 h−1 and the yield coefficient was found to be 0.007 g g−1 Fe2+. The specific O2 demand of an exponentially growing, ironoxidizing batch culture was 1.33 mg O2 mg−1 biomass h−1. The results indicate that a pH of 1.3 has no negative influence on the kinetics of iron oxidation and growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170403
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Potential of Thiobacillus ferrooxidans for waste gas purification. Part 2. Increase in continuous ferrous iron oxidation kinetics using immobilized cells (1993)
    Springer
    Applied microbiology and biotechnology 40 (1993), S. 582-587 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Thiobacillus ferrooxidans could be used to regenerate ferrous sulphate solution produced in a process to remove H2S from waste gas if the reaction rate could be increased. The aim of the present study was to increase the volumetric productivity by using immobilized cells. Kinetic data of ferrous iron oxidation were determined in fixed-bed and fluidized-bed reactor configurations with different support materials in order to find the most practical system for scale-up. By using a fixed-bed reactor the iron oxidation rate can be increased to 3.6 g l−1 h−1, fivefold higher than suspended cells, and results in a bioreactor of reasonable size. With the kinetic data obtained, the biological reaction is no longer a limiting factor for industrial-scale application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00175751
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  • 10
    Electronic Resource
    Electronic Resource
    Extended culture ofCandida boidinii on methanol (1975)
    Springer
    Applied microbiology and biotechnology 1 (1975), S. 295-305 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary This paper deals with a specific technique of substrate feeding in methanol fermentation of the yeastCandida boidinii. The control loop is based on the measurement of methanol in the exhaust air. Experimental results from extended batch fermentations at different methanol concentrations are represented. A mathematical model including the inhibitory characteristics of methanol is compared with the experimental results. The effect of the inhibitory influence of methanol on the growth in continuous culture is discussed by means of a mathematical simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01382688
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    Paper (German National Licenses)
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