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  • 1985-1989  (10)
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Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Optimization of the Simultaneous Saccharification and Fermentation of an Insoluble Substrate into Microbial Metabolites (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 469 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb26515.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Production of Enzyme Systems in Continuous Culture for the Controlled Lysis of Microbial Cells (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 506 (1987), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1987.tb23860.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A Distributed Model of Enzymatic Lysis of Microbial Cells (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 506 (1987), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1987.tb23862.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Use of cell recycle in the aerobic fermentative production of citric acid by yeast (1986)
    Springer
    Biotechnology letters 8 (1986), S. 7-12 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary An aerobic continuous stirred tank bioreactor with cell recycle was used to produce citric acid from glucose with a yeastSaccharomycopsis lipolytica NRRL Y7576. Specific rate of total acid production was 0.045h−1, yield on glucose was 0.86 g/g and volumetric productivity was 1.16 g acid/Lh; all higher than or similar to batch values. Effluent acid concentration was 75g/L. In batch, under nitrogen limited. conditions, stability of citric acid synthesis and excretion was constant over a period of 700 hours. Under conditions of cell recycle, cell concentration and rate of acid production were constant over 200 hours of operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01044392
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Epoxy-oxirane activation of PEG for protein ligand coupling (1989)
    Springer
    Biotechnology techniques 3 (1989), S. 27-32 
    Details
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary PEG was successfully activated using an epoxy-oxirane based reaction. The coupling of three protein ligands to activated PEG was investigated. Glutathione, Bovine Serum Albumin (BSA) and Protein A were successfully coupled to the activated PEG. Glutathione was coupled to 8% solutions of PEG (8000) and PEG (4000) at concentrations of 1.77 g/l and 1.14 g/l respectively. These values compare favourably with comercially available Sepharose, which gave a Glutathione concentration of 2.22 g/l. Protein A was coupled to a 20% PEG (8000) solution at a concentration of 5.7 g/l and BSA was coupled to a 20% PEG (8000) solution at a concentration of 6.2 g/l.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01876217
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Continuous-culture studies of synthesis and regulation of extracellular β(1-3) glucanase and protease enzymes from Oerskovia xanthineolytica (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 628-637 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This article describes the synthesis and regulation of β(1-3)glucanase and protease enzymes from the cell lytic system of Oerskovia xanthineolytica LL-G109 in continuous culture using different concentrations of carbon source (glucose) and inducer (glucan). These two enzyme activities are the main components of a lytic system capable of lysing and disrupting whole yeast cells; it is subject to catabolite repression by glucose and is induced by yeast glucan. Peaks of β(1-3)glucanase and protease activity are obtained at dilution rates of between 0.05 and 0.15 h-1. The glucanase-protease ratio is very high compared to other strains. At dilution rates above 0.15 h-1 all activities are similar to those obtained in batch culture. The lytic enzyme system appears to contain several β(1-3)glucanase enzymes. In continuous culture both productivity and enzyme concentrations are greatly in creased when compared to batch culture, 11- and 4.4-fold, respectively.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300507
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A structured mechanistic model of the kinetics of enzymatic lysis and disruption of yeast cells (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 31 (1988), S. 929-943 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A structured, mechanistic model has been built for the kinetics of yeast cell lysis by microbial cell lytic enzymes, based on an understanding of the two-layer yeast cell wall structure and the properties of yeast-lytic enzyme systems. The model predicts the release of protein, peptides and carbohydrates from four cell structures: the outer and inner wall layers, the cytosol and organelles or proteins present in particles; it also predicts organelle or particle lysis or solubilization and the breakdown of released proteins to peptides. Applications of the model to design and optimization of selective product release are discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260310906
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetics of enzymatic lysis and disruption of yeast cells: II. A simple model of lysis kinetics (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 481-490 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A simple two-step model is proposed to describe the kinetics of the two lytic systems examined in the preceding article. The model predicts concentrations of yeast solids, soluble proteins, peptides, and carbohyrates. In the first reaction step, yeast cell mass is solubilized; in the second, the released protein can be hydrolyzed to peptides. Kinetics for both yeast lysis and the subsequent protein breakdown are based on Michaelis-Menten expressions. Terms have been included for competitive inhibition of yeast lysis by substances in the Cytophaga enzyme preparation, and for incomplete hydrolysis of cells by the Oerskovia enzyme system. Parameters have been independently determined for all reactions except Oerskovia proteolysis, where they were fit by a leastsquares method to data from model test runs. The model has been verified for yeast concentrations between 0.7 and 70 g/L yeast (dry basis) and 4-40% crude enzyme solution.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300404
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics of enzymatic lysis and disruption of yeast cells: I. Evaluation of two lytic systems with different properties (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 471-480 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Many microorganisms produce enzymes which lyse the walls of yeasts, fungi, and bacteria. The proportions of different enzyme activities present in the lytic system, their action patterns, synergism, and dependence on inhibitors, constitute the activity profile of the lytic system. Taken together, the activity profile and process conditions for lysis determine the reaction rate and the distribution of products from lysis of any given type of cells. Kinetics of glucan hydrolysis, proteolysis, and lysis of brewer's yeast were compared for two extracellular yeast-lytic enzyme systems with different properties. The enzyme sources used were filtered culture broths from Cytophaga sp. NCIB 9497 grown in batch culture and from Oerskovia xanthineolytica LL-G109, grown under carbon limitation in continuous culture. Rate and extent of cell hydrolysis, and the accumulation of soluble proteins, peptides, and carbohydrates from the lysed yeast cells, are discussed in terms of the activity profiles and potential applications of the two enzyme systems.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300403
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and regulation of extracellular β (1-3) glucanase and protease by cytophaga sp. In batch and continuous culture (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 1366-1375 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Lytic enzyme systems with the ability to break whole cells of yeast are a mixture of several enzymes and virtually all contain β(1-3)glucanases and some protease. It appears that the presence of these two enzyme activities is necessary to break the two layers of the rigid cell wall. The enzyme system of Cytophaga NCIB 9497 has a high activity towards the walls of yeast and also of bacteria. This article describes the production of this extracellular lytic enzyme system in batch and continuous culture - it was found to be inducible. The synthesis and regulation of the two main constituent enzymes, β(1-3)glucanase and protease, have been investigated. The synthesis of β(1-3)glucanase is regulated by bothinduction (by an unknown inducer) and catabolite repression. Highβ(1-3)glucanase activities were obtained in continuous culture at low dilution rates over a narrow range (0.05-0.10 h-1), and there is evidence of the presence of more than one glucanase enzyme. Proteolytic activity appears subject to catabolite repression and made up of the activities of more than one protease enzyme. Productivity and enzyme concentration were increased several fold in continuous culture when compared to batch culture.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260280911
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