http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Transformation of Bicyclic Ketal Compound to 1,2-Cyclopentanediol via 1,5-Diketone
Jun Jong-Gab,Shin Dong Gyun,Shin Hyun Shun,Kim Sung Hoon Korean Chemical Society 1992 Bulletin of the Korean Chemical Society Vol.13 No.2
New method for preparing cyclopentanediol from bicyclic ketal is described. Bicyclic ketal is cleaved to give 1,5-diketone, which is then reductively coupled intramolecularly to yield 1,2-cyclopentanediol. A solution of bicyclic ketal (1a) in methylene chloride was treated with aluminum chloride(2 eq.)-sodium iodide(l.5 eq.) at ambient temperature for 3 h to give the 1,5-diketone (2a) in 71% yield after basic work-up followed by short path column chromatography. A solution of the 1,5-diketone (2a) in THF was reacted with titanium tetrachloride(6 eq.)-Mg(Hg)(0.3 eq.) at $0^{\circ}C$ for 4 h to give the 1,2-cyclopentanediol (3a) in 75% yield after basic work-up followed by short path column chromatography.
Stereoselective Reduction of Methyl Vinyl Ketone Dimer
Jun, Jong-Gab,Shin, Dong-Gyun,Lee, Chang-Kiu,Sin, Kwan-Seog Korean Chemical Society 1990 Bulletin of the Korean Chemical Society Vol.11 No.4
The stereoselectivity of the reaction between methyl vinyl ketone dimer, which contains two possible sites of chelation, and zinc borohydride or diisobutylaluminum hydride has been studied in order to illuminate the factors involved in the high levels of asymmetric induction obtained in the bicyclic system. The conditions for the formation of the exo-5,7-dimethyl-6,8-dioxabicyclo[3.2.1]octane are DIBAH reduction of MVK dimer in ether at reflux followed by acidic cyclizatioan, and for the endo isomer are $Zn(BH_4)_2$ reduction with $ZnCl_2$ at $0^{\circ}C.$.
고지혈증 흰쥐에 있어서 버섯 분말의 콜레스테롤 저하효과
김범규(Beom Kyu Kim),신갑균(Gab Gyun Shin),전병삼(Beong Sam Jeon),차재영(Jae Young Cha) 한국식품영양과학회 2001 한국식품영양과학회지 Vol.30 No.3
본 실험에서는 0.5% 콜레스테롤과 0.25% 콜산나트륨을 첨가한 콜레스테롤 식이와 콜레스테롤 식이에 4.0% 수준의 버섯분말(Lentinus edodes, Ganoderma lucidum, Pleurotus ostreatus; 5 : 3 : 2, w/w/w) 첨가 식이를 female Sprague-Dawley 흰쥐에 4주동안 섭취시켜 지질농도에 미치는 영향을 조사하였다. 혈청 콜레스테롤 농도는 버섯분말 첨가 식이군에서 57% 감소하고, 혈청 HDL-콜레스테롤 농도는 230% 증가하여 동맥경화 지수가 68.4% 감소함으로써 버섯분말에 항동맥경화 효과가 있는 것으로 사료되었다. 간장 콜레스테롤농도는 콜레스테롤 식이군에 비해 버섯분말 첨가식에서 24.7% 감소하였으나, 중성지질 농도는 50%의 유의한 증가를 나타내었다. 본 실험의 결과 콜레스테롤 식이에 버섯분말의 첨가에 의해 혈중 콜레스테롤 농도 저하효과와 동시에 항동맥경화 효과가 인정되어 버섯분말을 소재로 새로운 생리활성을 가지는 기능성식품개발의 가능성이 시사되었다. This study was performed to evaluate the effect of mushrooms powder (Lentinus edodes, Ganoderma lucidum, Pleurotus ostreatus; 5 : 3 : 2, w/w/w) of on the lipid concentrations in female Sprague-Dawley rats for 4 weeks. Experimental groups were divided into two dietary groups, the cholesterol diet (Cholesterol group) and the cholesterol diet supplemented mixed mushrooms powder (Mushroom group). The concentration of total cholesterol in serum was significantly decreased by 57.4% in mushroom group compared to cholesterol group. The concentration of HDL-cholesterol was significantly increased by 230% in mushroom group compared to cholesterol group. At the same time, atherogenic index was also significantly decreased by 68.4% in mushroom group compared to cholesterol group. The concentration of triglyceride in liver was significantly increased by 50% in mushroom group compared to cholesterol group. However, the concentrations of triglyceride and phospholipid in serum and cholesterol and phospholipid in liver had no significant difference both groups. This study suggested that mixed mushroom powders exert a cholesterole-lowering effect in hyperlipidemic female rats.
Jeon, Beong-Sam,Park, Jeong-Won,Shin, Gab-Gyun,Kim, Beom-Kyu,Kim, Hee-Kyu,Song, Jae-Young,Cho, Young-Su,Cha, Jae-Young Korean Society of Life Science 2004 생명과학회지 Vol.14 No.3
초호열성 고세균 Thermococcus litoralis 유래의 4-$\alpha$-glucanotransferase는 클로닝 되어 염기배열이 밝혀졌으며, 대장균에서 발현되었다 발현된 이 효소는 기능적인 면에서는 D-enzyme과 유사하지만 아미노산 배열에서는 큰 차이점을 나타내었다. 이 효소는 cycloamylose를 생산하는 새로운 기능적인 특성을 가지고 있어 당대사 관련 효소 단백질에 관한 연구의 중요성 때문에 산업적으로 많은 각광을 받고 있다. 본 연구는 초호열성 고세균 T. litoris 유래 4-$\alpha$-glucanotransferase 유전자를 부위 특이적 변이 방법으로 재조합하여 lac와 T7프로모터를 이용해서 대장균 발현 벡터 시스템에서 대량발현 시켰다. 대장균에서 대량 발현된 재조합 효소 단백질은 열처리, 501빌Butyl-Toyopearl, Mono Q 크로마티그래피 방법에 의하여 간단히 정제되었다. 정제된 재조합 효소 단백질은 본래의 효소 단백질과 같은 기능을 가지고 있는 것으로 확인되었다. The gene encoding a extremely thermostable 4-$\alpha$-glucanotransferase from a hyperthermophilic archaeon, Thermococcus litoralis, was cloned, sequenced and expressed in Escherichia coli. The amino acid sequence of the enzyme was distantly related to other functionally-related ones, such as D-enzymes. The enzyme is of industrial interest because of a novel activity of producing cycloamylose and is also important for fundamental studies of protein, sugar-metabolizing enzymes. In this paper, the overexpression of 4-$\alpha$-glucanotransferase in E. coli was carried out expression vector system with lac and T7 promoters. The enzyme was successfully overexpressed, and purified by the heat treatment of a cell-free extract, successive Butyl-Toyopearl and Mono Q chromatographies. The purified recombinant enzyme showed the same specific activity and the same mobility in SDS-PAGE as natural enzyme.
Kim, Sung Han,Seo, Ho Kyung,Shin, Hee Chul,Chang, Sung Ja,Yun, Sooin,Joo, Jungnam,Ku, Ja Hyeon,Kim, Hyung Suk,Jeon, Hwang Gyun,Jeong, Byong Chang,Jeong, In Gab,Kang, Seok Ho,Hong, Bumsik The Korean Academy of Medical Sciences 2015 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.30 No.8
<P>We investigated trends in perioperative chemotherapy use, and determined factors associated with neoadjuvant chemotherapy (NAC) and adjuvant chemotherapy (AC) use in Korean patients with muscle-invasive bladder cancer (MIBC). We recruited 1,324 patients who had MIBC without nodal invasion or metastases and had undergone radical cystectomies (RC) between 2003 and 2013. The study's cut-off time for AC was three months after surgery, and the study's timespan was divided into three periods based on NAC use, namely, 2003-2005, 2006-2009, and 2010-2013. Complete remission was defined as histologically confirmed T0N0M0 after RC. NAC and AC were administered to 7.3% and 18.1% of the patients, respectively. The median time interval between completing NAC and undergoing RC was 32 days and the mean number of cycles was 3.2. The median time interval between RC and AC was 43 days and the mean number of cycles was 4.1. Gemcitabine and cisplatin were most frequently used in combination for NAC (49.0%) and AC (74.9%). NAC use increased significantly from 4.6% between 2003 and 2005 to 8.4% between 2010 and 2013 (<I>P</I> < 0.05), but AC use did not increase. Only 1.9% of patients received NAC and AC. Complete remission after NAC was achieved in 12 patients (12.5%). Multivariable modeling revealed that an advanced age, the earliest time period analyzed, and clinical tumor stage ≤ cT2 bladder cancer were negatively associated with NAC use (<I>P</I> < 0.05). While NAC use has slowly increased over time, it remains an underutilized therapeutic approach in Korean clinical practice.</P>
Hypoglycemic Effect of Mushroom Fermented Milk in Streptozotocin-Induced Diabetic Rats
Cha, Jae-Young,Jeon, Beong-Sam,Park, Jeong-Won,Shin, Gab-Gyun,Kim, Beom-Kyu,Kim, Hee-Kyu,Cho, Young-Su Korean Society of Life Science 2004 생명과학회지 Vol.14 No.4
버섯 추출물을 첨가하여 유산 발효시킨 버섯발효유와 이때 사용된 버섯 추출물 및 버섯발효유 상등액의 항당뇨 효과를 규명하고자 Sprague-Dawley 수컷에 streptozotocin을 50 mg/kg body weight씩 복강내 주사하여 당뇨를 유발시켜 검토하였다. 버섯발효유, 상등액 및 버섯 추출물을 식이 중에 10% (v/w)씩 동량 첨가 한 식이를 3주간 급여한 후 혈당치, 인슐린 농도 및 경구당부하실험을 실시하였다. 버섯발효유의 이화학적 성분을 분석 한 결과 단백질 2.87%, 지방 0.09%, 탄수화물 6.0%, 식이섬유 0.3%, 락토스 2.01%, 슈크로스 1.23% 및 칼슘과 철 성분을 각각 95.9 및 0.08 mg/l00 g함유하고 있었다. Streptozotocin-유발 대조군 당뇨쥐에 비해 버섯발효유 투여군에서 현저한 혈당강하 효과가 있었으며, 이러한 효과는 인슐린 농도증가에 의한 것으로 나타났다. 또한, 버섯발효유 상등액 및 버섯 추출물에도 혈당강하 효과가 있는 것으로 나타났다. 실험 종료시점에 실시한 경구당부하실험에서도 버섯발효유, 상등액 및 추출물 순으로 현저한 효과를 보였다. 이상의 결과로 볼 때 혈당강하 효과가 있는 버섯과 유산균을 접목한 버섯발효유 제조는 이들 상호간의 시너지 효과에 의해 당뇨성 흰쥐에서 현저한 항당뇨 효과를 발휘하였다. Nutritional concentrations by chemical analyses of mushroom fermented milk were protein 2.87%, fat 0.09%, carbohydrates 6.0%, dietary fiber 0.3%, lactose 2.01%, sucrose 1.23%, calcium 95.9 mg/100 g and iron 0.08 mg/100 g. The present study was undertaken to investigate the hypoglycemic effects of the equal volume of either water (streptozotocin (STZ)rontrol rats), mushrooms water-extract (STZ-extrart fed rats), mushroom fermented milk product (STZ-mushroom yogurt fed rats) or mushroom fermented milk supernatant (STZ-supernatant fed rats) (10%, v/w), in STZ-induced diabetic rats for 3 week period. The mushroom fermented milk given to the STZ-diabetic rats decreased the blood glucose significantly and increased the blood insulin, compared with the STZ-control rats. The supernatant and mushroom water extract also slightly retarded the development of hyperglycemia in the STZ-diabetic rats. Taken together the results, the mushroom yogurt may have a potential for the hypoglycemic effect in the STZ-diabetic rats.