growth kinetics and human growth hormone production of a heat- inducible recombinante cherichia coli during batch fermentation

نویسندگان

f. tabandeh

چکیده

the batch fermentation production of human growth hormone (hgh) was studied in a newrecombinant escherichia coli. the effect of different levels of dissolved oxygen and glucoseconcentration on cell density and substrate utilization were evaluated. the results indicated that theoptimum level of dissolved oxygen was 25% of air saturation. the specific growth rate reached amaximum for an optimal glucose concentration of 5 gl-1, the maximum yield was 0.58 gg-1 and glucosewas completely consumed after 10 hrs. the growth of recombinant e. coli on semi-defined and complexmedia was compared. the results demonstrated that dry cell weight and maximum specific growth ratewere 2.35 gl-1 and 0.4 h-1 on a complex medium, respectively, but they were 3.3 gl-1 and 0.24 h-1 onsemi-defined medium. the plasmid stability and hgh production during batch fermentation wereinvestigated. the results suggested that the specific growth rate is the most important factor on hghproduction and should be investigated in fed batch cultivation to get high cell density.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

RT-PCR MEDIATED CLONING OF HUMAN GROWTH HORMONE GENE AND I TS EXPRESSION IN E. coli

Human growth hormone (hGH) genomic sequence containing 5 exons and 4 introns was cloned in pcDNA-3 and the constructed plasmid was subsequently used for transfection ofNlli-3T3 cell line using lipofection technique. Expression of hGH in stably transfected cells was assayed using ELISA. Total RNA was extracted from transfected cells and hGH cDNA was amplified by RT-PCR using specific primers...

متن کامل

Heat production and growth kinetics of E. coli K12 from flow calorimetric measurements on chemostat cultures.

The heat production of E. coli K12 growing aerobically in glucose limited chemostat cultures is determined in the range of specific growth rates mu (= dilution rates D) from 0.058 h-1 to 0.852 h-1 for two different glucose concentrations Se in the instream of the chemostat, namely Se1 = 0.3182 g.l-1 and Se2 = 0.6364 g.l-1. Heat production Q and biomass production P per unit of culture volume sh...

متن کامل

The Over-Expression of Biologically Active Human Growth Hormone in a T5-Based System in Escherichia coli, Studying Temperature Effect

We studied the expression of human growth hormone (hGH) in E. coli under a bacteriophage T5-base promoter in a pQE30 expression vector. For an efficient expression of hGH cDNA, a number of codons at the hGH N-terminal coding region were altered based on the E. coli major codons. An over-expression of hGH in the bacteria, carrying the recombinant plasmids, was observed at 37°C in the presence of...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
iranian journal of science and technology (sciences)

ISSN 1028-6276

دوره 28

شماره 1 2004

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023