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안석헌,정윤중,염희남,이종민 明知大學校 産業技術硏究所 1991 産業技術硏究所論文集 Vol.10 No.-
Stoichiometric mullite powder was prepared with Al(OH)₃, which was synthesized from Al₂(SO₄)₃·18H₂O and SiO₂, which was hydrolysised from TEOS(Al₂O₃:SiO₂=3 : 2 mole%), the sintered body of only mullite and the Y₂O₃ added mullite body were prepared and it's properties were detected. The results are follows. Crystalized mullite begins to founded from 1200 calaination and Well-Crystalzed mullite forms from the calcination temperature, 1300℃ . Crystal grains of mullite is accicular, and its relative density and bending strength of mullite ceramics which is sintered at 1650℃ are 92% and 180Mpa, respectively. As Y₂O₃ addtion the bending strength can be increased to 220MPa, because Y₂O₃ distribute and fill the vacancies of accicular mullite grain boundaries.
Yoon-Hyuck Chang(장윤혁),Joong-Hyun Yeom(염중현),Kyung-Hwan Jung(정경환),Byung Chul Chang(장병철),Jung Hee Shin(신정희),Sun-Kyun Yoo(유선균) 한국생명과학회 2009 생명과학회지 Vol.19 No.4
본 연구는 Lipomyces starkeyi KCTC 17343에 의한 dextranase 최적 생산 조건을 확립하고 dextran에 대한 효소분해 특성을 규명하였다. 균주의 성장과 dextranase생산은 발효초기 pH와 온도에 따라 다르며 최적 pH는 4-5, 최적온도는 25-30℃의 범위에서 결정이 되었다. 최적 발효조건에서의 dextranase 생산은 total enzyme activity가 4.85 IU/㎖으로 나타났다. 이때의 발효균주의 specific growth rate는 0.076h?¹이었다. 발효 중 dextranase의 활성은 발효 정상기에서도 안정성을 유지하였다. Dextranase에 의한 dextran을 가수분해 결과, 가수분해물의 구성은 DP2 to 8에 이르는 올리고 덱스트란으로 이루어졌다. We optimized dextranase culture conditions by batch fermentation using Lipomyces starkeyi KCTC 17343. Furthermore, dextranase was purified by an ultra-membrane, and then dextran hydrolyzates were characterized. Cell growth and dextranase production varied depending on the initial culture pH and temperature. The conditions of optimal dextranase production were met in a pH range of 4-5 and temperature between 25-30℃. At optimal fermentation conditions, total enzyme activity and specific enzyme activity were about 4.85 IU/㎖ and 0.79 IU/g cells, respectively. The specific growth rate was examined to be 0.076 hr-¹. The production of dextranase in culture broth was very stably maintained after mid-log phase of growth. The enzyme hydrolyzed dextran into DP (degree of polymerization) 2 to 8 oligodextran series. Analysis of the composition of hydrolysates suggested that the enzyme produced is an endo-dextranase.
Age-specific eNOS polymorphisms in moyamoya disease.
Park, Young Seok,Min, Kyung Tae,Kim, Tae-Gon,Lee, Yun Ho,Cheong, Hee Jin,Yeom, In Sun,Choi, Joong-Uhn,Kim, Dong-Seok,Kim, Nam Keun Springer Verlag 2011 Child’s nervous system Vol.27 No.11
<P>We conducted a case-control study to investigate whether polymorphisms in eNOS are related to the age-specific onset of moyamoya disease.</P>
인천지역 유통 과일 중 잔류농약 모니터링 및 위해성 평가
정세진 ( Se Jin Chung ),김혜영 ( Hye Young Kim ),김지형 ( Ji Hyeung Kim ),염미숙 ( Mi Suk Yeom ),조중희 ( Joong Hee Cho ),이수연 ( Soo Yeon Lee ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.2
BACKGROUND: This study was conducted to investigate the levels of pesticide residues in fruits and to assess their METHODS AND RESULTS: Monitoring of 215 samples of fruits collected from local markets in incheon during 2013 was performed. 259 pesticides were analyzed by multi-residue method and Quick, Easy, Cheap, Effective, Rugged, and safe/Mass/Mass(QuEChERS/MS/MS) method using Gas Chromatography-Electron Capture Detector/Nitrogen Phosphorus Detector(GC-ECD/NPD), GC-MS, LC(Liquid Chromatography-Mass/Mass(LC-MS/MS) and High Performance Liquid Chromatography-Photodiode Array/ Fluorescence Detector(HPLC-PDA/FLD). In 56.3% of the samples detected pesticide residues and were not found to exceed Maximum Residue Limits(MRL). The highest detected samples were found in citrus fruits(83.9%). Among the detected compounds, carbendazim(13.1%), imazalil (11.7%), thiabendazole(10.7%) and fludioxonil(9.8%) were frequently found in fruits. A risk assessment of pesticide residues in fruits was performed by calculating Estimated Daily Intake(EDI) and Acceptable Daily Intake(ADI). Also, we were evaluated removal efficiency of pesticide residues by washing and peeling. The removal efficiency of pesticide residues in citrus and tropical fruits by peeling processes were 91.6%. After the washing process, the removal rates were 43.1%(Cherry, Grape, Blueberry). CONCLUSION: The level of pesticide residues in fruits was within the MRL. The range of %ADI values was from 0.00011 to 0.98795%. The process of washing or peeling reduces the level of pesticide residues. The results of this research concluded that the detected pesticides are not harmful to human being.