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pubmed-article:1367817pubmed:abstractTextA clonal derivative of a transfectant of the SP2/0 myeloma cell line producing a chimeric monoclonal antibody was cultivated in both continuous open and continuous partially-closed bioreactors. Using an open system for the determination of kinetic parameters, we showed that the production of this chimeric mAb was growth associated. As such, the volumetric productivity increased linearly with increasing dilution rate up to the maximum dilution rate. Three continuous cultivations employing partial cell retention were conducted. In agreement with mathematical predictions, the product titer and volumetric productivity were independent of the degree of cell retention when the total dilution was held constant. When cells were maintained at a low specific growth rate, the product titer was independent of dilution rate and the volumetric productivity increased with increasing dilution rate, again in agreement with mathematical predictions. Since the partially-closed bioreactor could be operated at dilution rates in excess of the maximum specific cellular growth rate, volumetric productivities were greater than those achievable in the open bioreactor. However, when cells were maintained at a high specific growth rate, cell accumulation was limited and product titers decreased at high dilution rates. Therefore, the volumetric productivity in this latter case did not increase at higher dilution rates.lld:pubmed
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pubmed-article:1367817pubmed:pagination41-50lld:pubmed
pubmed-article:1367817pubmed:dateRevised2004-11-17lld:pubmed
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pubmed-article:1367817pubmed:year1992lld:pubmed
pubmed-article:1367817pubmed:articleTitleEffect of specific growth rates on productivity in continuous open and partial cell retention animal cell bioreactors.lld:pubmed
pubmed-article:1367817pubmed:affiliationSandoz Research Institute, East Hanover, New Jersey.lld:pubmed
pubmed-article:1367817pubmed:publicationTypeJournal Articlelld:pubmed