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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 59 (1998), S. 189-202 
    ISSN: 0006-3592
    Keywords: artificial neural network (ANN) ; microfiltration ; cell harvesting ; membrane fouling ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Microfiltration is an important unit operation in downstream processing. However, due to the influence of membrane fouling, prediction of the filtration performance for biological suspensions is difficult. This paper describes a modeling approach that allows a comprehensive description of filtration performance. On the basis of experimental data and linguistic information, a specific artificial neural network was developed that predicts the process behavior within a certain range of parameters. This approach allows us to analyze influences of fermentation on filtration. By using extensive simulations, the interactions of 17 parameters were examined and the fouling causes determined. The model was developed for cell harvesting of Escherichia coli through a shear-enhanced module. The method can be applied to any cross-flow filtration process. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 59:189-202, 1998.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 68 (1996), S. 546-550 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 299 (1959), S. 122-137 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reactions between hydrogen sulfite and hydroxylamine-N-monosulfonate or -N-disulfonate are branched ones, yielding about 70% imidodisulfonate and 30% amidosulfonate or 70% nitridotrisulfonate and 30% imidodisulfonate.The reaction velocities are proportional to the concentrations of sulfonate and hydrogen sulfite.The activation energies in the temperature range from 25 to 60°C are 24.5 and 18.0 kcals/mol, the A-factors are 1.2 · 1015 and 4.3 · 1011 1/mol · min, respectively. Osulfinic acids are assumed to be intermediate products.
    Notes: Die Umsetzungen von Hydroxylamin-N-monosulfonat und -N-disulfonat mit Hydrogensulfit sind gegabelte Reaktionen, die zu etwa 70% zu Imidodisulfonat bzw. Nitridotrisulfonat und zu 30% zu Amidosulfonat bzw. Imidodisulfonat führen. Die Geschwindigkeit des Stoffumsatzes ist proportional der Konzentration des Sulfonats und des Hydrogensulfits. Die ARRHENIUsschen Aktivierungsenergien im Temperaturbereich von 25 bis 60°C sind 24,5 bzw. 18,0 kcal/Mol, die A-Faktoren 1,2 · 1015 bzw. 4,3 · 1011 1/Mol · min. Wahrscheinlich sind Zwischenprodukte der Umsetzungen O-Sulfinsäuren, deren innermolekulare Umlagerung und Hydrolyse die Reaktionsgabelung verursachen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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