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류욱상,장형욱,이홍원,정준기,장순재,유연우,박영훈 한국미생물 · 생명공학회 1999 한국미생물·생명공학회지 Vol.27 No.4
A highly productive fed-batch fermentation process was developed for the production of L-ornithine by using a new stabilized strain, Breviabcterium ketoglutamicum BK52. Fed-batch cultures with a continuous feeding of the complex medium were conducted on various operating conditions. The optimal concentration of phosphate in the complex medium was 2.1g/L. The optimal feeding rate of L-arginine was 0.028g/L/hr. The optimal feeding point of the complex medium was determined to be at 40 OD of the cell mass. The final L-ornithine concentrations within 64hrs of cultivation in 5 and 50 liter fermenters were 73g/L and 71g/L, respectively. The maximum overall L-ornithine productivity was 1.14g/L/hr which was about 2 times higher than that of the conventional fed-batch culture with intermittent feeding. The overall productivity of the fermentation system is remarkably improved by employing the optimized conditions, and it offers a significant potential for industrial application.
Brevibacterium ketoglutamicum을 이용한 L-Ornithine 생산 연구 PART I : L-Ornithine 생산 고역가 안정화 균주 선발
류욱상,장형욱,이홍원,정준기,장순재,유연우,박영훈 한국미생물 · 생명공학회 1999 한국미생물·생명공학회지 Vol.27 No.4
Overproduction of L-ornithine by mutant strains isolated from Brevibacterium detoglutamicum BK1046 was investigated. The strain was a L-ornithine auxotroph and exhibited culture instability during fermentation. Through a sequential screening effort, a highly stable strain with lless revertant formation was finally selected and designated B. ketoglutamicum BK52 (KCTC0141BP). It prouduced L-ornithine at a high concentration (above 9 g/L) independent of subculture or cultivation time, and also had a very low tendency of revertant formation. In a long-term storage, this strain maintained its cell stability and productivity of L-ornithine to a reasonable range.
김치의 Pediococci 에 존재하는 Plasmid DNA 분리
박연희,조도현,류욱상 한국농화학회 1988 Applied Biological Chemistry (Appl Biol Chem) Vol.31 No.1
Three species of Pediococci, Pediococcus pentosaceus, Pedioeoccus acidilactici and Pediococcus halophilus were isolated from Kimchi. P. pentosaceus and P. acidilactici showed inhibitory activity against Streptococcus faecalis, Pseudomonas sp., P20 and Vibrio parahaemolyticus. However, the growth of all test organisms was not inhibited by P. halophilus. Ten strains contained one to seven plasmids, ranging in size from 1 to 60 megadaltons.