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Clostridium autoethanogenum 배양에서 배지조성이 균주 성장과 생성물 생산에 미치는 영향
안보혜(Bohye Ahn),박소은(Soeun Park),김영기(Young-Kee Kim) 한국생물공학회 2018 KSBB Journal Vol.33 No.2
In this work, optimization of the culture medium in the fermentation process of Clostridium autoethanogenum, an acetogenic microorganism, to produce ethanol from synthesis gas, was examined to improve the ethanol production. The components of culture medium, such as fructose, NH₄Cl, and K₂HPO₄, were selected as influence factors for cell growth and ethanol production. As the concentration of fructose increased, the cell mass increased from 0.178 to 1.069 at yeast extract of 0.5 g/L and the cell mass increased from 0.715 to 2.260 at yeast extract of 5 g/L. But the ethanol production decreased when the concentration of fructose was higher than that of base medium (5 g/L). And the specific ethanol productivity was the highest when fructose was not used. Cell growth and ethanol production were not significantly influenced by NH4Cl concentration, however growth inhibition was observed at 30 g/L of NH₄Cl. As the concentration of K₂HPO₄ increased, both of cell growth and ethanol production increased. From experiments with NH₄Cl and K₂HPO₄, specific ethanol productivities were higher when low quantity of yeast extract (0.5 g/L) was used.
Clostridium ljungdahlii 배양에서 배지 조성에 따른 균주 성장과 바이오에탄올 생산에 대한 영향
안보혜 ( Bohye Ahn ),박소은 ( Soeun Park ),김영기 ( Young-kee Kim ) 한국공업화학회 2018 공업화학 Vol.29 No.4
무기탄소원으로부터 에탄올을 생산하는 acetogenic 박테리아인 Clostridium ljungdahlii 발효공정에서 배양 배지 조성에 따른 영향을 분석하여 균주 성장과 에탄올 생산 향상을 시도하였다. 균주 성장 및 에탄올 생산에 영향을 줄 수 있는 배지 구성성분으로 yeast extract, fructose, NH<sub>4</sub>Cl, K<sub>2</sub>HPO<sub>4</sub>를 선정하였다. Yeast extract 농도가 증가할수록 균주 성장과 에탄올 생산이 증가하였으며 에탄올 비생산성은 yeast extract 기본 배지 농도보다 낮은 0.05 g/L에서 가장 높았다. Fructose 농도가 증가할수록 균주 성장은 증가하였지만 5 g/L을 초과하는 fructose 투입은 에탄올 생산을 감소시켰다. Yeast extract 5 g/L인 조건에서 fructose 5 g/L와 넣었을 때 에탄올 생산농도가 0.297 g/L로 가장 높았으나, fructose를 넣지 않았을 때 매우 낮은 균주 농도로 인해 에탄올 비생산성은 0.281 g/g DCW로 높았다. NH<sub>4</sub>Cl은 균주 성장이나 에탄올 생산은 큰 차이를 보이지 않았으며 30 g/L 이상 과다 투입하면 성장저해가 나타났다. K<sub>2</sub>HPO<sub>4</sub>에 대해서는 농도가 증가할수록 균주 성장과 에탄올 생산이 모두 증가하였다. NH<sub>4</sub>Cl과 K<sub>2</sub>HPO<sub>4</sub>를 사용한 경우 에탄올 비생산성은 yeast extract를 적게 사용한 경우 크게 나타났다. In this work, effect of the culture medium composition on the fermentation process of Clostridium ljungdahlii, which is acetogenic bacteria to product ethanol from synthesis gas, was examined to improve the microbial growth and ethanol production. Components of the culture medium such as yeast extract, fructose, NH<sub>4</sub>Cl, and K<sub>2</sub>HPO<sub>4</sub> were selected as influence factors for the cell growth and ethanol production. As the concentration of yeast extract increased, both of the cell growth and ethanol production increased. And the ethanol productivity was the highest at an yeast extract of 0.05 g/L, which is lower than that of base medium. As the concentration of fructose increased, the cell growth increased, but the ethanol production decreased when the concentration of fructose was higher than that of base medium (5 g/L). In an experiment with the yeast extract of 5 g/L, produced ethanol concentration was the highest (0.297 g/L) when fructose concentration was 5 g/L, however, the specific ethanol productivity was higher (0.281 g/g DCW) when the fructose was not added due to very low cell mass. The cell growth and ethanol production were not significantly influenced by NH4Cl concentration, however the growth inhibition was observed at a 30 g/L of NH<sub>4</sub>Cl. When the concentration of K<sub>2</sub>HPO<sub>4</sub> increased, both of the cell growth and ethanol production increased. In experiments with NH<sub>4</sub>Cl and K<sub>2</sub>HPO<sub>4</sub>, specific ethanol productivities were higher when the low concentration of yeast extract was used.
Obstetrical outcomes of amniocentesis or chorionic villus sampling in dichorionic twin pregnancies
( Eunhee Ahn ),( Bohye Kim ),( Hyo J. Ki ),( Sukho Kang ),( Sung W. Chang ),( Sang H. Jung ),( Myoung J. Moon ),( Mi S. Kim ),( Soobin Lee ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: This study aimed to evaluate the procedure-related fetal loss and the obstetrical outcomes of chorionic villus sampling and amniocentesis in twin pregnancies. Methods: The data from dichorionicdiamniotic twin pregnancies for which first-trimester chorionic villus sampling or second-trimester amniocentesis was performed between December 2006 and January 2017 at a single institute, were retrospectively analyzed. The groups were compared with respect to the procedure-related and obstetrical outcomes. Results: The difference in procedure-related fetal loss rate (1.9% for chorionic villus sampling vs. 1.8% for amniocentesis; P=1.000) and overall fetal loss rate (7.4% for chorionic villus sampling vs. 4.7% for amniocentesis; P=0.489) between the two groups was not significant. The difference in miscarriage rate and early preterm delivery were not significant between the groups (miscarriage: 5.6% for chorionic villus sampling vs. 0.6% for amniocentesis; early preterm delivery: 11.1% for chorionic villus sampling vs. 10.6% foramniocentesis; P=NS). The differences in mean gestational ages at delivery, birth weights, and neonatal intensive care unit admission rate were not statistically significant. Conclusion: To our knowledge, this is one of the few studies to compare chorionic villus sampling and amniocentesis in twin pregnancy, including procedure-related fetal loss. The procedure-related fetal loss and the overall fetal loss of chorionic villus sampling appear comparable to those of amniocentesis. Both procedures can be safely used based on several factors: indications, gestational age, technical difficulties, the likelihood to proceed to selective feticide, and operators experience. These findings can be useful for clinicians when counseling parents of twins regarding their options for antenatal aneuploidy, genetic diagnosis, and the associated risks. Furthermore, randomized controlled trials are required to compare the safety of chorionic villus sampling and amniocentesis in twin pregnancies.