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송윤석(Yoon Seok Song),이희욱(Hee Uk Lee),이자현(Ja Hyun Lee),최한석(Han Suk Choi),최웅수(Ung Su Choi),김승욱(Seung Wook Kim) 한국생물공학회 2012 KSBB Journal Vol.27 No.4
Synthetic plastics are important in many branches of industry. Although synthetic plastics provide numerous benefits, they also cause a significant environmental pollution problem because of their non-readily-biodegradability. Biodegradation may provide solution to the problem, but not enough is known about the biodegradation mechanisms of synthetic plastics. This review has been written to provide an overview of the current state of synthetic plastics (polyethylene, polyurethane, nylon, polyvinyl alcohol) biodegradation. Several biodegradation mechanisms of a few selected synthetic plastics are also presented.
글리세롤 기반의 바이오에탄올 생산을 위한 연속생산반응기의 성능 비교
이상준(Sang Jun Lee),송윤석(Yoon Seok Song),김성봉(Sung Bong Kim),강성우(Sung Woo Kang),한성옥(Sung Ok Han),박철환(Chulhwan Park),김승욱(Seung Wook Kim) 한국생물공학회 2011 KSBB Journal Vol.26 No.4
Ethanol production using glycerol as a carbon source was performed by Enterobacter aerogenes immobilized on calcium alginate beads. To improve the ethanol production, the optimal conditions such as loading amount of immobilized cells and glycerol concentration were investigated. The optimal loading amount of immobilized cells and glycerol concentration were 10 mL of calcium alginate bead and 10 g/L, respectively. Consequently, glycerol consumption rate, ethanol concentration and yield were 0.32 g/L · h, 3.38 g/L and 0.43 g/g on the batch production, respectively. Continuous production of ethanol was successfully achieved using two types of immobilized cell reactors (continuous stirred tank reactor and packed bed reactor) from 10 g/L of glycerol. In the continuous stirred tank reactor, glycerol consumption, ethanol concentration, specific productivity and yield were 9.8 g, 4.67 g/L, 1.17 g/L · h, 0.48 g/g, respectively. The concentration of produced ethanol was 38-44% higher comparison to batch fermentation, and continuous stirred tank reactor showed better performance than packed bed reactor.
이창민(Chang-Min Lee),윤린(Rin Yun),문현만(Hyeun-Man Moon),송윤석(Yoon-Seok Song),최동규(Dong-Guo Choi) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
MVR의 경우 압축과정을 폴리트릭픽과정으로 가정하여 이론적 모델링을 수행하였고, 그 성능은 제작사에서 제공된 성능곡선을 사용하여 평가하였다. TVR의 해석 및 설계에 있어서는 노즐과 디퓨저를 포함한 내부에 유체유동에 대한 보존방정식을 적용하여 분석하였다. 이를 통해 노즐과 목, 그리고 디퓨저의 크기를 결정할 수 있었다. MVR와 TVR의 이론적 모델링은 3개회사의 설계자료와 그 성능 및 에너지 및 질량수지를 비교하여 검증하였고, 본 모델의 실용적 적용을 위해 GUI 설계 툴을 개발하였다. 본 툴을 활용해 MVR과 TVR의 물질 및 에너지수지와 이들의 세부 설계규격을 결정할 수 있다. The MVR was theoretically modeled by assuming the process as the polytropic process, and the performance of the MVR was estimated by using the performance-curve provided by the manufactures. The TVR was investigated by applying the conservation equations to the movement of the fluids inside the TVR. The size of the nozzle and diffuser can be determined. The theoretical MVR and TVR modeling was verified by comparing the results from the model with the available design data. Besides, the GUI program was developed for the practical usage of the modeling. The mass and energy balance information, and the specifications for the MVR and TVR can be available by using the GUI tool.
오메가-3 지방산 함유 복분자종자유에 의한 고지방식이 유도 고지혈증 마우스의 혈중 중성지방 및 콜레스테롤 감소 효과
전혜린(Hyelin Jeon),오수진(Su-Jin Oh),남현수(Hyun Soo Nam),송윤석(Yoon Seok Song),최경철(Kyung-Chul Choi) 한국식품영양과학회 2015 한국식품영양과학회지 Vol.44 No.7
본 실험의 복분자종자유는 리놀렌산 238.3 mg/g, 리놀레산과 감마리놀렌산 427.1 mg/g을 포함하며 이는 고시된 범위내의 섭취량이므로 독성시험 없이 4주 동안 매일 경구 투여로 암컷과 수컷 쥐 모두에게 섭취하도록 하였다. 또한 성인정상체중을 약 60 kg으로 설정하고 60 kg의 성인이 하루 1 g, 2 g을 각각 섭취할 때의 혈중 지방의 감소 효과를 알아보기 위해 급이군의 설정을 1 g/60 kg BW/d(BSO 1 g), 2 g/60 kg BW/d(BSO 2 g)로 정하였다. 양성대조군의 경우에 판매되는 연어유 1,000 mg 캡슐을 2정 섭취하는 것을 권장하였고, 이에 맞추어 2 g/60 kg BW/d로 설정하게 되었다. 실험기간 종료 후 마우스를 희생시켜 혈액을 얻었으며, 복분자종자유(BSO 2 g)를 섭취한 마우스에서 총콜레스테롤 및 HDL, LDL/VLDL-콜레스테롤과 혈중 중성지방이 유의적으로 감소하는 것을 확인할 수 있었다(P<0.05). 이를 종합해 보았을 때 복분자종자유는 고지혈증 상태를 개선하고 미약하지만 항응고 활성을 통해 혈액의 항상성을 유지하도록 돕는 작용을 한다고 할 수 있다. 따라서 앞으로 동물유래가 아닌 식물유래 복분자종자유를 이용한다면 고지혈증 개선 효과와 혈액 항응고 활성을 조절할 수 있을 것이며, 더욱 다양한 표적 인자 분석을 통하여 복분자종자유의 고지혈, 항응고 및 혈행개선 기전연구가 가능할 것이라 판단된다. To investigate the effect of n-3 fatty acid from Bokbunja (Rubus coreanus Miq.) seed oil (BSO), we examined improvement of plasma triglycerides and cholesterol in vivo. Five-week-old ICR mice were divided into five groups of six mice each; Control, high fat diet (HFD) control (negative control), salmon oil control (positive control, HFD+commercial n-3 fatty acid), and BSO experimental groups (HFD+1 g/60 kg BW/d, HFD+2 g/60 kg BW/d). After 4 weeks of BSO treatment, we measured serum triglyceride and cholesterol levels. The levels of low-density lipoprotein/very-low-density lipoprotein-cholesterol, high-density lipoprotein-cholesterol, and total cholesterol were significantly (P<0.05) reduced in the group fed BSO at 2 g/60 kg BW/d compared to the negative control. Levels of triglycerides, which are similar to cholesterol, were also significantly (P<0.05) reduced in the same group. To investigate further, we tested blood coagulation parameters. Prothrombin time (PT) and activated partial thromboplastin time (aPTT) were not significantly different among the five groups according to BSO. However, the 2 g/60 kg BW/d BSO group treated with PT and aPTT showed a tendency to live longer than the negative control. Taken together, BSO might improve blood homeostasis mediated via hypo-lipidemic and anti-coagulation activities.