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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Bioprocess and biosystems engineering 4 (1989), S. 231-234 
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The hybridoma cell's maximum capacity for monoclonal antibody (MAb) production is estimated to be 2300–8000 MAb molecules/cell/s, using measured rates of transcription and translation, and the limitations imposed by the size of the polymerase molecule and the ribosome. Nearly all the production rates reported in the literature fall into or below this range of production rates. Data from batch cultures of hybridomas demonstrate a constant specific rate of MAb production until the time integral of the viable cell concentration reaches about 108 cells · h/cm3. At this point, some essential nutrients from the standard media are depleted, causing MAb production to decline.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 43 (1994), S. 541-541 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 43 (1994), S. 683-683 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The retroviral titer obtained from the pMFG/ψCRIP producer cell line is determined by a dynamic interplay of vector production and deactivation rates. Both these rates are influenced by temperature. It was determined that; (i) the retroviral half-lives are strongly influenced by temperature and the temperature dependency can be described by the Arrhenius equation with an activation energy of 39 kcal/gmol; (ii) the actual retroviral vector productivity per cell is highest at 37 °C with retroviral production rate of 24.4(±7.0; ± standard deviation) colony forming unit (CFU)/cell/day; (iii) the dynamic interplay of these two factors produces an optimal temperature of 34 °C for pMFG/ψCRIP cells under the culture conditions used; and (iv) the cellular growth rate is highest at 37 °C at 26.8 hr doubling time. Taken together, these parameters can be used to optimize a two-step retroviral production protocol, where the cells are first grown under optimal growth conditions (37 °C) and second, the virus is produced at 34 °C to yield the highest titer. These results have significant implications for optimal retroviral production protocols.
    Type of Medium: Electronic Resource
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