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Imidazole Trimer-Water Complexes in Superfluid Helium Nanodroplets: Water Stretching Modes
Ahn, Ah-Reum,Lee, Seung-Jun,Lee, Seul-Ki,Min, Ah-Reum,Kim, Yu-Sic,Jung, Hyeon-Jin,Hong, Seong-Min,Lee, Joon-Hwa,Choi, Myong-Yong,Miller, Roger E. Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
Ah Reum Lee,Yu Ock Shin,Joo Young Lee,Min Yeong Kim,Sung Ho Shin,Bu-Il Seo,Young-Bae Seo,Man Hee Rhee,TakakoYokozawa,Chan Hum Park,Seong-SooRoh 한국약용작물학회 2015 한국약용작물학술대회 발표집 Vol.2015 No.05
Purpose Rhei Rhizoma (RR) is one of the herbal medicines traditionally used to treat diverse inflammatory diseases. The present study was undertaken to elucidate the antioxidant and anti-inflammatory activities of Rhei Rhizoma on experimental reflux esophagitis (RE) in rats. Methods The antioxidant activity of RR in vitro was measured in terms of radical scavenging capacity such as DPPH and ABTS. RE was produced by ligating both the pylorus and the transitional junction between the forestomach and the corpus. Rhei Rhizoma (125 and 250 mg/kg) were administered every day for 7 days, and its effect was estimated on comparison with RE control and normal rats. Results RR scavenged DPPH and ABTS effectively and IC50ofDPPH and ABTS radical scavenging activity of RR were 4.8 μg/ml and 15.75 μg/ml. The administration of RR decreased the elevated serum ROS in RE control rats. The RE control rats exhibited the down-regulation of antioxidant-related proteins such as Nrf2 and HO-1expression levels in the esophagitis; however, the level in the RR-treated RE rats was significantly higher than that in the RE control rats. Moreover, RE control rats exhibited the up-regulation of the protein expression related to oxidative stress at the esophagitis, but RR administration significantly reduced the expression of inflammatory proteins through the MAPK-independent signaling pathways. The expression of inflammatory mediators and cytokines by NF-κB activation was modulated through blocking the degradation of IκBα. In addition, the oral administration of RR regulated the gastric mucosal damage in RE rats. Conclusion The administration of Rhei Rhizoma effectively ameliorates the inflammatory damage of esophageal mucosa through radical scavenging activity and the activation of the Nrf2/HO-1 pathway.
( Ah Reum Khang ),( Eun Ki Kim ),( Eun Shil Hong ),( Hyung Jin Choi ),( Chan Soo Shin ),( Kyong Soo Park ),( Seong Yeon Kim ) 대한내과학회 2011 대한내과학회 추계학술발표논문집 Vol.2011 No.1
Parathyroid cysts are very rare among the causes of primary hyperparathyroidism (PHPT). They are divided into functional and nonfunctional cysts. Operative removal is a treatment of choice for a functional cyst. 99mTc-Sestamibi parathyroid scan is a highly effective and sensitive diagnostic tool for localization of hyperparathyroidism, however it shows a false-negative result, occasionally. We found one case which was presumed to have cystic parathyroid adenoma based on clinical findings and neck computed tomography (CT) with negative finding in parathyroid scan. A male patient who was 44 years-old visited to hospital due to legs pain and it was occurred 5months ago and deteriorated gradually. In addition, he presented with the compressive symptoms such as dysphagia and hoarseness. Serum calcium level was 14.4 mg/dl, phosphorus 2.0 mg/dl, creatinine 0.99 mg/dl and intact parathyroid hormone (iPTH) was increased to 478.1 pg/ml. On neck CT, 6.2×3.8×2.7 cm sized cystic nodule was found in inferior part of right thyroid gland. Sestamibi uptake for the found nodule was not detected on 2 hour delayed imaging of 99mTc-Sestamibi parathyroid scan. Fine needle aspiration for diagnosis and localization was done and intracystic iPTH was increased to 61,600 pg/ml. The iPTH monitoring for focused parathyroidectomy led to successful enucleation of right inferior parathyroid. It was a parathyroid adenoma and serum calcium, phosphate and iPTH was normalized after operation. A cystic parathyroid adenoma can be hardly detected on 99mTc-Sestamibi parathyroid scan sometimes. The multidisciplinary approach which considered clinical findings, laboratory results, physical examination and other imagings (CT, Ultrasound, etc) is important for differential diagnosis of hyperparathyroidism. The iPTH monitoring helps the focused parathyroidectomy.
자연정화공법을 이용한 소형 축산폐수처리장치의 최적여재 선정
김아름(Ah-Reum Kim),김홍출(Hong-Chul Kim),서동철(Dong-Cheol Seo),박종환(Jong-Hwan Park),김성헌(Sung-Hun Kim),이성태(Seong-Tae Lee),정태욱(Tae-Uk Jeong),최정호(Jeong-Ho Choi),김현욱(Hyunook Kim),조주식(Ju-Sik Cho),허종수(Jong-Soo Heo) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.2
소규모 축산농가로부터 발생되는 축산폐수를 효과적으로 처리하기 위한 인공습지를 개발하기 위하여 인공습지에서 가장 중요한 인자 중 하나인 최적 여재의 선정에 관하여 연구하였다. 최적여재를 선정하기 위하여 여재를 왕사, 쇄석, 제올라이트 및 방해석으로 달리하여 충진한 후 각 여재별 축산폐수 처리효율 조사한 결과 COD 처리효율은 왕사가 다른 여재에 비하여 높았고, SS 처리효율은 모든 여재에서 94~95%로 큰 차이 없었다. 또한 T-N 처리효율은 제올라이트가 다른여재에 비해 높았고, T-P 처리효율은 방해석이 다른여재에 비해 높았다. 이상의 결과에서 COD,SS, T-N 및 T-P 모두를 안정적으로 처리할 수 있는 최적여재는 왕사였다. 소형 축산폐수처리장치에서 질소와 인 처리효율을 극대화 하기 위해 호기성조 (왕사:쇄석:방해석=3:2:1)와 혐기성조 (왕사:쇄석:제올라이트=3:2:1)에 혼합여재를 주입한 결과 최적 여재인 왕사에 비해 질소 및 인 처리효율이 각각 15% 및 7% 향상되었다. In order to develop livestock wastewater treatment technology by natural purification method, the optimum filter media in small-scale livestock wastewater treatment apparatus for treating livestock wastewater were studied. Removal rates of pollutants under different filter media were in the other of coarse sand ≒ broken stone > zeolite > calcite for COD, zeolite >> broken stone ≒ coarse sand ≒ calcite for T-N, and calcite > coarse sand ≒ broken stone ≒ zeolite for T-P. Based on the above results, the optimum filter media was coarse sand in small-scale livestock wastewater treatment apparatus. To meet acceptable effluent quality standard for livestock wastewater and to improve T-N and T-P removal efficiencies, removal efficiencies of pollutants in small-scale livestock wastewater treatment apparatus with mixed filter media were studied. The removal rates of COD, SS, T-N and T-P in effluent were 84, 94, 65 and 98% in small-scale livestock wastewater treatment apparatus with mixed filter media, respectively. For increasing the T-N and T-P removals in small-scale livestock wastewater treatment apparatus, the mixed filter media are recommended.
열내성 Cellobiose 2-epimerase를 발현하는 대장균의 고정화담체를 이용한 락툴로오스의 생산방법
박아름 ( Ah-reum Park ),구봉성 ( Bong-seong Koo ),김진숙 ( Jin-sook Kim ),김은정 ( Eun-jeong Kim ),이현철 ( Hyeon-cheol Lee ) 한국미생물생명공학회(구 한국산업미생물학회) 2016 한국미생물·생명공학회지 Vol.44 No.4
락툴로오스는 기존에 화학적인 이성화법을 통해 생산해왔던 기능성 당으로서 프로바이오틱스나 장내균총 개선을 위한 의약품으로 활용되어 왔다. 최근 락툴로오스 화학전환법의 단점인 촉매제거와 부산물제거 에너지손실등의 문제를 해결할 수 있는 생물촉매를 이용한 락툴로오스 전환법이 대두되었다. 본연구에서는 유당의 낮은 용해도와 락툴로오스의 효율적전환을 위해 최적의 효소를 선별하여 무작위 돌연 변이법으로 유전자를 개량하여 열내성이 75℃까지 증진되고 활성이 1.3배 향상된 효소를 선별하였다. 이 효소를 정제하여 사용하는 대신 본 연구에서는 과량 발현시킨 대장균을 Caalginate로 고정화하여 70℃에서 200 g/l의 유당과 회분식으로 반응시켜 43%의 전환 수율을 확인하였다. 반복회분식 실험에서 고정화된 담체는 비교적 안정적이었으며 4회 반복반응 후에도 80% 이상의 활성을 유지하고 있었다. 산업적인 방법을 개발하기 위해 고정화 담체를 이용한 반응기의 운전 최적화와 담체의 안정화를 증진시키는 추가적인 연구가 필요하지만, 본 연구에서는 열내성 특성을 이용하여 정제된 효소가 아닌 효소를 발현하는 세포자체를 고정화 시킴으로써 경제성있는 생산에 대한 방법론을 제시하였다. Lactulose, a synthetic disaccharide, has received increasing interest because of its role as a prebiotic that can increase the proliferation of Bifidobacterium and Lactobacillus spp. and enhance the absorption of calcium and magnesium. While the industrial production of lactulose is still mainly achieved by the chemical isomerization of lactose in alkaline media, this process has drawbacks including the need to remove catalysts and by-products, as well as high energy requirements. Recently, the use of cellobiose 2-epimerase (CE) has been considered an interesting alternative for industrial lactulose production. In this study, to develop a process for enzymatic lactulose production using CE, we screened improved mutant enzymes (CS-H<sup>R</sup>C<sup>E</sup>) from a library generated by an error-prone PCR technique. The thermostability of one mutant was enhanced, conferring stability up to 75℃, and its lactulose conversion yield was increased by 1.3-fold compared with that of wild-type CE. Using a recombinant Escherichia coli strain harboring a CS35 H<sup>R</sup>C<sup>E</sup>- expressing plasmid, we prepared cell beads immobilized on a Ca-alginate substrate and optimized their reaction conditions. In a batch reaction with 200 g/l lactose solution and the immobilized cell beads, lactose was converted into lactulose with a conversion yield of 43% in 2 h. In a repeated 38-plex batch reaction, the immobilized cell beads were relatively stable, and 80% of the original enzyme activity was retained after 4 cycles. In conclusion, we developed a reasonable method for lactulose production by immobilizing cells expressing thermostable CE. Further development is required to apply this approach at an industrial scale.