%0 Journal Article
%@ 09593993
%A Nayak, D.P.
%A Vyas, V V
%D 1999
%F open:810
%I Springer Science
%J World Journal of Microbiology and Biotechnology
%K Escherichia coli, fedbatch cultivation, growth rate, high cell density, plasmid stability
%N 1
%P 65-71
%T Improved stability and expression of a recombinant shuttle plasmid in Escherichia coli during fedbatch cultivation.
%U http://crdd.osdd.net/open/810/
%V 15
%X The effect of higher cell densities on the expression and segregational stability of a recombinant E. coli- B. subtilisshuttle plasmid coding for carboxymethylcellulase (CMCase) activity, was studied in E. coli DH5. Of the various feeding policies adopted for maximal expression and stability, exponential feeding resulted in the highest biomass of 15g dry cell weight (DCW) l–1 and plasmid stability of 45%. A CMCase activity of 11400 Uml–1 was achieved as compared to 230 Uml–1 during batch cultivation. In the case of other feeding strategies viz., constant feeding, linear feeding or intermittent feeding, the plasmid stability varied between 20% to 60%. Biomass achieved ranged from 5.0 g DCW l–1 to 9.0 g DCW l–1 and enzyme activities were between 2550 Uml–1 and 6000 Uml–1.
%Z Copyright of this article belongs to Springer Science.