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  • 1
    Electronic Resource
    Electronic Resource
    Thermostable α-amylase production by immobilized Bacillus licheniformis cells in agar gel and on acrylonitrile/acrylamide membranes (1994)
    Springer
    Applied microbiology and biotechnology 41 (1994), S. 517-522 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Immobilized cells of Bacillus licheniformis 44MB82-G were used for the production of thermostable α-amylase. The immobilization was carried out by entrapment in agar gel or by binding to formaldehyde-activated acrylonitrile/acrylamide membranes. The α-amylase production after 144 h of cultivation of membrane immobilized cells was 40% higher in comparison with the free cells. The respective value for the agar-entrapped cells was 22%. Similar trends were observed in the repeated batch fermentations performed with the immobilized cells. The scanning electron micrographs (SEM) of the immobilized cells gave additional information about their binding to the respective carriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178482
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermostable α-amylase production by immobilized Bacillus licheniformis cells in agar gel and on acrylonitrile/acrylamide membranes (1994)
    Springer
    Applied microbiology and biotechnology 41 (1994), S. 517-522 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Immobilized cells of Bacillus licheniformis 44MB82-G were used for the production of thermostable α-amylase. The immobilization was carried out by entrapment in agar gel or by binding to formaldehyde-activated acrylonitrile/acrylamide membranes. The α-amylase production after 144 h of cultivation of membrane immobilized cells was 40% higher in comparison with the free cells. The respective value for the agar-entrapped cells was 22%. Similar trends were observed in the repeated batch fermentations performed with the immobilized cells. The scanning electron micrographs (SEM) of the immobilized cells gave additional information about their binding to the respective carriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050183
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Immobilization of Bacillus licheniformis cells, producers of thermostable α-amylase, on polymer membranes (1998)
    Springer
    Journal of industrial microbiology and biotechnology 20 (1998), S. 166-170 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: thermostable α-amylase; cell immobilization; Bacillus licheniformis; polymer membranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cells of Bacillus licheniformis 44MB82-G immobilized on different polymer membranes were used for production of thermostable α-amylase. The α-amylase yields of the membrane-immobilized cells were affected by the reactive chemical groups of the carriers and the spacer size. Formaldehyde-activated polysulphone membranes (PS-FA) were the most suitable for effective immobilization. The highest amylase yield (62% increase of the control) and operational stability (97% residual activity after 480 h repeated batch cultivation) were obtained with this system. This was confirmed by scanning electron micrographs. An additional increase of α-amylase production by PS-FA-membrane immobilized cells was achieved in a fluidized-bed reactor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900509
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The pretreatment effect on wheat straw saccharification (1988)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 8 (1988), S. 225-231 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Enzymatic hydrolysis of cellulose is potentially an attractive method for converting cellulose into glucose which can then be used as a chemical feed or as a growth substrate for a number of microorganisms to produce microbial products.An enzymatic hydrolysis of wheat straw with cellulase preparation “Trichocease” was made. The wheat straw used was pretreated mechanically and with NaOH. A procedure of pretreatment was investigated in 26 variants. The dynamics of enzymatic hydrolysis was studied. An assay of this dynamics based on the amount of reducing sugars formed during the cellulase reaction and depending upon enzyme and substrate concentration and time of action was carried out.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370080305
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    Paper (German National Licenses)
    Fulltext
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