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바이오 디젤유 생산을 위한 대두유 에스테르화 반응의 속도론적 연구
황우람,신용섭 慶星大學校 環境問題硏究所 2002 環境硏報 Vol.12 No.1
The esterification of vegetable oil with methanol is one of the best ways to improve it's combustion characteristics. Therefore, in this study, the process which produce the bio-diesel oil from vegetable oil by the esterification reaction was investigated. Especially, the kinetic study on the esterification reaction of soybean oil was performed. Catalysts used in this study were sodium hydroxide as a homogeneous catalyst and calcium hydroxide as a heterogeneous catalyst. Because sodium hydroxide reacted with free fatty acid in the soybean oil and 0.5wt% of the sodium hydroxide was greater than the free fatty acid content in the soybean oil, it is very important for the completion of esterification reaction that the free fatty acid in the soybean oil should be removed before the esterification reaction. Compared with reaction rate constant of the esterification reaction rate constant of saponification had constant value in case of using sodium hydroxide catalyst. Interestingly, rate constant of the esterification reaction was decresed with increase of sodium hydroxide dosage. Compared with reaction rate constant of the esterification reaction, reaction rate constant of saponification had constant value in case of using sodium hydroxide catalyst. Interestingly, rate constant of the esterification reaction was decresed with increase of sodium hydroxide dosage. Using calcium hydroxide catalyste, reaction rate constants in FAMEs production step were Measured from 0.9141 min-1 to 1.0377 min-1, and reaction rate constants in monoglyceride and diglyceride production steps were measured from 0.0093 min-1 to 0.0386 min-1 according to the calcium hydroxide dosage. So, monoglyceride and diglyceride production steps rate controlling steps in overall esterification reaction.
8.3% Carbamide Peroxide 함유 펜 형 자가미백제인 BIancTis Forte의 색조개선 및 안전성에 관한 임상연구
이진경,민선홍,홍성태,오소람,정신혜,황영혜,유성엽,배광식,백승호,이우철,손원준,금기연 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.2
This clinical study evaluated the whitening effect and safety of polymer based-pen type BlancTis Forte(NIBEC) containing 8.3% carbamide peroxide. Twenty volunteers used the BlancTis Forte whitening agent for 2 hours twice a day for 4 weeks As a control. Whitening Effect Pen (LG) containing 3% hydrogen peroxide was used by 20 volunteers using the same protocol. The change in shade (ΔE^(*) color difference) was measured using Shadepilot™ (DeguDent) before, during and after bleaching (2 weeks, 4 weeks and postbleaching 4 weeks). A clinical examination for any side effects (tooth hypersensitivity or soft tissue complications) was also performed at each check-up. The following results were obtained. 1 Both the experimental and control groups displayed a noticeable change in shade (ΔE) of over 2 No significant differences were found between the two group (p>0.05) implying that the two agents have a similar whitening effect. 2 The whitening effect was mainly due to changes in a and b values rather than in L value (brightness). The experimental group showed a significantly higher change in b value thus yellow shade than the control(p < 0.05) 3 None of the participants complained of tooth hypersensitivity or soft tissue complications confirming the safety of both whitening agents 8.3%의 carbamide peroxide를 함유한 펜형 코팅용 미백제인 BlancTis Forte (NIBEC, Seosul & JinCheon)를 실험군으로, 3% hydrogen peroxide를 함유한글 Whitening Effect Pen (LG. Seoul) 제재를 대조군으로 각각 피험자 20명에게 2시간씩 1일 2회 제조사의 지시대로 치아표면에 4주간 적용하도록 지시하고 색조개선 효능과 안전성을 평가하였다. 미백 효과는 미백 전 및 미백 2주, 4주 및 미백 종료 4주 후에 Shadopilot™을 이용하여 색 변화를 측정하였고, 매 내원시기마다 모든 환자는 치수생활력 검사와 치주 및 치태 검사를 통해 부작용 여부 (치아과민증 및 구감 내 연조직의 부작용)를 기록한 후 다음과 같은 결과를 얻었다. 1.실험군 및 대조군의 색 변화량 (ΔE)은 2이상으로 인지할 수 있는 색 변화를 보였으며, 두 제품 간에는 통계적으로 유의한 차이를 보이지 않아 (p > 0.05) 유사한 미백효능을 나타냄을 알 수 있었다. 2,미백효과는 명도의 개선보다는 주로 a. b값의 변화에 의한 것으로 특히 실험군에서 b값의 변화, 즉 황색조의 개선효과가 대조군에 비해 유의성 있게 높은 것으로 나타났다 (p <0.05). 3.치아나 치은의 과민증이나 이상증상을 호소하는 피험자는 없어 두 제품 모두 안전성을 확인할 수 있었다.
Shin Yo Seob,Lee Young Woo,Shin Dong Gyu,Shin Woo Ram 대한말초신경학회 2019 The Nerve Vol.5 No.2
Chronic subdural hematoma (CSDH) is a common condition. However, it is rarely calcified. Among various causes, hydrocephalus and ventriculoperitoneal shunts in CSDH are uncommon causes of calcification. A 38-year-old woman presented with visual disturbance. Computed tomography and magnetic resonance imaging of the brain demonstrated compressed optic chiasm by planum sphenoidale meningioma. And massive bilateral calcified CSDH with cerebral convexity. Surgery was performed to remove the tumor and ipsilateral calcification. The symptoms improved following discharge after surgery. As this is a rarely performed surgery, caution is advised to prevent damaging the dura matter when cutting the bone and to prevent damaging the brain during dissection.
Estimating a Binomial Proportion with Imputed Conditional Means in Stratitied Sampling
Shin, Min Woong,Kang, Woo Ram 한국외국어대학교 기초과학연구소 2001 기초과학연구 Vol.12 No.-
The one of analytic imputation technique involving conditional means was mentioned by Schafter and Schenker(2000). And their derivations are based asymptotic expansions of point estimator and their associated variance estimator, and the result of imputation can be thought of as first-order approximations to the estimators. Specially in this paper, we present the estimating a Binomial proportion imputed conditional means in stratified sampling.
Woo Cheol Shin,Dahye Yoon,Seon Min Oh,Bo-Ram Choi,Yunji Lee,Hyoung-Geun Kim,Nam-In Baek,Geum-Soog Kim,Min-Ho Lee,Dae Young Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Panax ginseng C. A. Meyer is distributed and cultivated in Korea, China, and Japan. Although their genetic information is the same, metabolites are different depending on the environmental factors of the cultivation region, and these metabolite changes cause differences in pharmacological effects. Metabolomics refers to the study of comprehensive metabolic changes occurring in the body. These metabolites may vary depending on disease, organic mutations, or environmental factors. For this reason, metabolites can be used for biomarkers. NMR and UPLC-Q-TOF/MS are the most widely used instruments for metabolite analysis. Recently, in metabolic studies, multi-platform metabolic studies using a combination of various instruments have been actively conducted, and this method can further help interpret metabolic analysis results. In this study, in order to determine the origin of ginseng and analyze biomarkers, metabolites of P. ginseng grown in Korea, China, and Japan were analyzed through multi-platform metabolomics using NMR and UPLC-Q-TOF/MS. The origins of P. ginseng were discriminated using multivariate statistical analysis and the candidate of biomarkers were identified.
( Woo Soo Jeong ),( Yu-ri Kim ),( Seong-jin Hong ),( Su-jeong Choi ),( Ji-ho Choi ),( Shin-young Park ),( Eui-jeon Woo ),( Young Min Kim ),( Bo-ram Park ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.12
Isomaltooligosaccharides (IMOs) have good prebiotic effects, and long IMOs (LIMOs) with a degree of polymerization (DP) of 7 or above show improved effects. However, they are not yet commercially available, and require costly enzymes and processes for production. The Nterminal region of the thermostable Thermoanaerobacter thermocopriae cycloisomaltooligosaccharide glucanotransferase (TtCITase) shows cyclic isomaltooligosaccharide (CI)-producing activity owing to a catalytic domain of glycoside hydrolase (GH) family 66 and carbohydrate-binding module (CBM) 35. In the present study, we elucidated the activity of the C-terminal region of TtCITase (TtCITase-C; Met740-Phe1,559), including a CBM35-like region and the GH family 15 domain. The domain was successfully cloned, expressed, and purified as a single protein with a molecular mass of 115 kDa. TtCITase-C exhibited optimal activity at 40°C and pH 5.5, and retained 100% activity at pH 5.5 after 18-h incubation. TtCITase-C synthesized α-1,6 glucosyl products with over seven degrees of polymerization (DP) by an α-1,6 glucosyl transfer reaction from maltopentaose, isomaltopentaose, or commercialized maltodextrins as substrates. These results indicate that TtCITase-C could be used for the production of α-1,6 glucosyl oligosaccharides with over DP7 (LIMOs) in a more cost-effective manner, without requiring cyclodextran.