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  • 1
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 0 (1980), S. 3-3 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 1 (1981), S. 41-47 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die bei der Herstellung von OYOKPO, einem in der Bendel-Region von Nigeria traditionell auf Hirse-Basis gewonnenem Bier, wirkenden Mikroorganismen wurden untersucht.Die Ergebnisse zeigen zwei Phasen der Einwirkung unterschiedlicher Mikroorganismen.Fü r die saccharolytischen Aktivitä ten beim Mä lzprozeβ sind die aus den gelagerten Hirsekörnern stammenden Mikroorganismen (im Zusammenwirken mit der pflanzlichen Amylase des Hirsemalzes) verantwortlich. Sie werden wahrscheinlich beim Erhitzungsprozeß abgetötet.Die im fermentierten Produkt gefundenen Mikroorganismen stammen aus der fü r die Fermentation eingesetzten Starterkultur; sie vergä ren die niederen Zucker zu Alkohol.Schimmelpilze treten nach der Fermentation nicht mehr auf; Hefen sind wä hrend des Mä lzprozesses nicht zu finden mit Ausnahme von Saccharomyces cervisiae, sie erscheinen jedoch wä hrend der Fermentation. Veschiedene Bakterienarten sind in allen Stadien anzutreffen, so beim Mä lzen, Maischen und bei der Reifung. (Acetobacter wurde bis zu Beginn der Reifung nicht nachgewiesen.) Der pH-Wert sinkt von Beginn der Fermentation (5,2) bis zum Ende auf 3,8. Der am Ende erhaltene Sä urewert entspricht 0,43% (als Essigsä ure titriert).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 1 (1981), S. 57-65 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Growth of Methanosarcina barkeri on methanol as energy source was found to be dependent on cobalt and molybdenum. In the presence of 10-6 M Co and 5 × 10-7M Mo optimal growth occurred. Furthermore it could be demonstrated that nickel and selenium each in a concentration of 10-7 M stimulated the growth of this methanogenic bacterium while the following elements tested in the range of 10-7 M to 10-3 had no influence: B, Cr, Cu, Mn, Pb. The requirement of Co and Ni for optimal growth are in accordance with the results that the cells contain the Co containing corrinoid Factor III (0.1 - 0.2 mg 5-hydroxylbenzimidazolylcyanocobamide per g wet cells) and Factor F430, a nickel component. Studies on the vitamin dependency of M. barkeri showed that this strain needs only the vitamin riboflavin for the growth in a defined medium. Under these conditions a cell density of 2.6 g dry cells/l could be obtained in a fed batch culture.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 0 (1980), S. 61-64 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: On the basis of the combustion enthalpy of microbial biomasses carbon substrates for the aerobically heterotrophic growth of microorganisms can be divided into substrates with energy excess (e.g. ethanol, n-alkanes) and with energy deficit (or carbon excess, e.g. acetate, glucose). By combining substrates having different carbon energy ratios from both groups in a certain mixing proportion an improvement of the yield coefficients linked to a reduction of the specific heat production (kJ/g dry weight), an increase of the growth rate (h-1) and the velocity of the substrate utilization ought to be possible on condition that the co- or auxiliary-substrate does not cause inhibition or (catabolite-) repression effects.There are some examples corroborating the theoretical concept, e.g. the combinations ethanol/sucrose-Candida utilis, methanol/xylose-Hansenula polymorpha. In each case the specific growth rate and the yield coefficient on the mixture were higher than on any single substrate of the combination.Thermochemical methods are suitable for the optimizing the substrate mixing proportion.
    Additional Material: 1 Tab.
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  • 5
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 1 (1981), S. 139-143 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of microorganisms growing on the walls of laboratory fermenters was investigated and a model to describe of microbial lysis and the formation of growth inhibitory products in a continuous fermentation process was developed.The predictions were compared with results from an earlier model for growth of microorganisms on surfaces.
    Additional Material: 1 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 1 (1981), S. 161-165 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract in Russian.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: An agardeliverer, one of the machines of the Autoselect-system is described. This machine allows to pour melted agar automatically into a row of 8 microculture cups of a cassette with 64 cups. By changing the agarcontainer provided for one medium against another container with 8 chambers the machine offers the possibility to deliver 1 to 8 media simultaneously. In this respect the machine gets more and more interest not only for the selection of antibiotic producers, but also for taxonomic, genetic and other studies. Sterile conditions are ensured by sterilizing the head of the machine before starting the work.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 1 (1981), S. 73-102 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: A review is given of most of the literature concerning the immobilization of whole microbial cells and their testing for application in product synthesis. The review includes a discussion of adventages and disadventages of immobilized cells, methods of immobilization, pretreatments, aftertreatments, operation, recent developments, and other problems together with a table of the immobilized microbes and the tested reactions of product synthesis, with 350 references.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 1 (1981), S. 107-113 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Rheological measurements can give interesting informations for the characterization of fermentation broth, especially concerning the depending of the oxygen transfer rate. Rheological measurements can report decisions for choosing the best reactor type or other process steps e.g. purification and separation.An advantageous method was used by the combination of a dynamic process-viscosimeter with the fermenter and the continuous measurement of medium density by X-ray absorption method.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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