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β-lactamase를 생성하는 Xanthomonas maltophilia의 배지조정과 배양조건의 최적화
박선호,유연수 啓明大學校 産業技術硏究所 1998 産業技術硏究所 論文報告集 Vol.21 No.1
Xanthomonas maltophilia, which can produce β-lactamase, were isolated from Galleria mellonella larvae. Medium composition for bacteria growth was optimized. As a result, the best nitrogen source was found to be yeast extract. The medium composition consisted of 5% yeast extract, 0.5% NaCl, and 0.5% KH₂PO₄. The optimum temperature for cell growth was 28℃. The culture pH approached to about 9.0 during the cell growth period regardless of initial pH ranging from 6 to 10. Meanwhile, the carbon sources such as glucose or fructose showed as decreasing trend of pH and thus inhibited the further cell growth. The specific growth rate of X. maltophilia in a 5L-fermentor was 2.6 times greater than that in a flask culture, presumably due to enhanced aeration and agitation conditions.
꿀벌부채명나방 유충으로부터 Xanthomonas maltophilia의 분리 및 동정
박선호,유연수 계명대학교 산업기술연구소 1998 産業技術硏究所 論文報告集 Vol.21 No.1
A symbiotic bacteria associated with Galleria mellonella larva was isolated and identified as Xanthomonas maltophilia sp. by using the BioLog Automated Microbial Identification System. Also three other strains of bacteria were isolated from Galleria mellonella larvae and identified as CDC group DF-3, Enterobacter agglomerans biogroup 5, and Serratia marcescens sp., respectively. Several biochemical and physiological tests were performed to determine the strain characters. X. maltophilia did not adsorb neutral red of bromothymol blue and grew below 37℃. Xanthomonas maltophilia and three other strains were pathogenic against the insect host when they were injected into hemolymph of the insect. X. maltophilia was rod-shaped and its cell size was ranged from 1㎛ to 2㎛.
박선호,유연수 啓明大學校 産業技術硏究所 1997 産業技術硏究所 論文報告集 Vol.19 No.2
A solid gelatin microcarrier with the size distribution between 100 and 400㎛ was prepared for in vitro cultivation of anchorage-dependent animal cells. For a relatively uniform and spherical bead, the optimum gelatin solution temperature and stirring speed were evaluated as 50-60℃ and 200-280rpm, respectively. Also, the dry beads cross-linked with 0.4% glutaraldehyde showed an approximately 2 fold increase in diameter at 37℃ in distilled water. Using gelatin beads, microcarrier culture were successfully conducted for the attachment and growth of NIH3T3 and C(6) cell lines, The 10g/L of microcarrior concentration was best for the achievement of maximum cell concentration.