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김희남,윤여권,김상백,최희성,안효종 한국안전학회 2004 한국안전학회지 Vol.19 No.2
The magnetic polishing is the usefiil method to finish using magnetic power of magnet. This method is one of precision polishing techniques and has an aim of the clean technology using for the pure of gas and inside of the clean pipe for transportation. The magnetic abrasive polishing method is not so common for machine that it is not spreaded widely. There are rarely researcher in this field because of non-effectiveness of magnetic abrasive. Therefore, in this paper deals with development of the magnetic abrasive using sludge. In this development, abrasive grain WA and GC used to resin bond fabricated low temperature. And magnetic material was fabricated from the sludge which were crused into 200 mesh and average diameter 01.2mm ball type. The XRD analysis result show that only WA and GC abrasive and sludge crystal peaks detected which explains resin bond was not any more chemical reaction. From SEM analysis it is found that WA and GC abrasive and sludge were strong bonding with each other by bond.
6-(3,4-디클로로페닐)아미노-7-클로로-5,8-퀴놀린디온의 항진균작용 및 안전성 평가
윤여표,김동현,이병무,허문영,정해문,강혜영,최정아,김도희,유충규 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1
6-(3.4-Dichlorophenyl)amino-7-chloro-5.8-quinolinedione (RCK50) was tested for antifungal activities in mice systemically infected with Candida albicans. The therapeutic potential of RCK50 was also assessed in comparison with ketoconazole. RCK50 had ED_50 0.22±0.01 ㎎/㎏. Ketoconazole as a positive control had ED_50 6.00±1.70 ㎎/㎏. Intraperitoneally administered RCK50 at the ED_50 for 7 days and 14 days reduced Candida albicans colony count in the kidneys and liver. And administered RCK50 at the ED_50 for 14 days improved survival rates. The genotoxicities of RCK50 had been evaluated. RCK50 was negative in Ames test with Salmonella typhimurium and chromosomal aberration test in CHL cells. RCK50 did not show any clastogenic effect in mouse peripheral blood and was negative in mouse micronucleus assay. These results indicate that RCK50 has no genotoxic potential under these experimental conditions. Acute oral toxicity studies of RCK50 were carried out in ICR mice of both sexes. RCK50 did not show acute oral toxicities and LD_50 values were over 2.850 ㎎/㎏ in ICR mice.
Helicobacter pylori와 대장균의 Shuttle Vector 개발
조명제,이우곤,이상룡,김경희,안영숙,김성희,김현주,류복덕,최여정,윤영혜,백승철,전영석,이광호 경상대학교 유전공학연구소 1997 遺傳工學硏究所報 Vol.16 No.-
In this study, a vehicle vector using cryptic plasmids was constructed for gene transfer in Helicobacter pylori. pHP51(3.9 kb) and pHP489(1.2 kb) were selected for constructing vectors from cryptic plasmid of H. pylori isolates in Korea. The HindⅢ-digestedDNA fragment(1.2kb) of pHP489 and 1.6kb DNA fragment of pHP51 were ligated with a kanamycin resistance gene(aph3'-Ⅲ) from C. jejuni to produce the recombinant plasmids pHP489K and pHP51K, respectively. Transformation frequency of pHP51K by electroporation was low. But pHP489K could be effectively transformed into various H. pylori strains. In order to design an intermdiate vehicle vector for gene transfer into H. pylori, pBlueHP489K was prepared by recloning pHP489K DNA into pBluescript and pTZ19R vector. This vector permitted the DNA fragment containing pHP489 sequence, aph3'-Ⅲ, and cloned DNA to be cut and self-ligated in the SacⅠ site after cloning. ureA and ureB gene were inserted into pBlueHP489K, resulting in pBlueHP489K/AB. The DNA fragment containing pHP489, kanamycin resistance gene(aph3'-Ⅲ), and urease structural gene was cut away from pBlueHP489K/AB and self-ligated to generate pBlueHP489K/AB. pBlueHP489K/AB made urease-negative H. pylori strains restore their urease activity. By this experiment, pBlueHP489K was confirmed to be the vehicle system for transferring H. pylori genes.
장애인 공동생활가정 종사자의 업무환경이 직무만족에 미치는 영향
석여희(Yeo-Hee Seok),최희철(Hee-Chul Choi) 한국콘텐츠학회 2016 한국콘텐츠학회논문지 Vol.16 No.1
본 연구는 장애인그룹홈 종사자 148명을 대상으로 종사자의 업무환경이 직무만족에 어떠한 영향을 미치는지 분석한 것이다. 연구결과, 종사자들은 직장의 업무환경의 6개 하위영역 중 도전과 역할모호성에 대해서는 3.08점과 3.61점으로 보통 이상의 수준에서 인식을 하고 있었으나, 편안함, 금전적 보상, 역할갈등, 업무량에 대해서는 평균 1.80점에서 2.73점 사이로 보통 이하의 수준으로 상대적 취약성을 보였다. 다중회귀분석 결과 도전과 역할모호성이 유의미한 영향을 미치는 것으로 나타났다. 이러한 결과는 업무환경에서는 사회재활교사의 업무기준을 명시하고 다양한 방법으로 그룹홈 지원체계를 강화하여 종사자들의 자기개발과 도전의 기회를 높이고, 문제해결을 위해 필요한 지원이나 지지를 높여나가야 함을 제언하였다. This study analyzed how work environment of staff in group homes on their job satisfaction targeting 148 persons. As a result, this study found that the staff recognize challenge and role ambiguity at the level which is above level ranging from 3.08 to 3.61 points with respect to 6 subdomains of work environment, but showed a relative vulnerability regarding comfortability, monetary reward, role conflict and workload as below average ranging from 1.80 to 2.73 points. Results of multiple regression analysis show that challenge and role ambiguity exert a significant influence on their job satisfaction. The above results suggest that it is necessary to provide staff with an opportunity for self-development and challenge by specifying service standards for social rehabilitation teachers in work environment and strengthening group home support system in various ways, enhancing support or advocacy necessary for solving problems.
신갈나무로부터 유래된 추출물의 Botrytis cinerea 균주에 대한 항균활성
여희동 ( Hee Dong Yeo ),이형철 ( Hyung Chul Lee ),임부국 ( Bu Kug Lim ),김희규 ( Hee Kyu Kim ),최명석 ( Myung Suk Choi ),양재경 ( Jae Kyung Yang ) 한국목재공학회 2008 목재공학 Vol.36 No.1
The aim of this study was to attempt the efficacy of antifungal activity of the wood extracts against Botrytis grey mold. Wood chip derived from Quercus mongolica was obtain from steam explosion process and extracted by hot water and methanol and ethanol. The conidial germination was maximum growth with the application temperature for 20 and 25℃. In pH test, we observed the maximum growth in pH 5.0 and 7.0. Antifungal activity was the best in the hot water extractives against Botrytis cinerea. The separation of the antifungal substances was performed using a silica-gel column (n-hexane : chloroform : ethyl acetate : formic acid = 12 : 17 : 8 : 0.2, v/v/v/v), TLC and UV-Spectrophotometer, and isolated 6 fraction group. The result of antifungal activity in 6 fraction group, fraction group Ⅰ and fraction group Ⅱ were the highest antifungal activity against grey mold with the present study. Three peaks in fraction group Ⅰ and Ⅱ were detected by HPLC and this compounds were suppose to effective of antifungal activity.
( Im Seop Choi ),( Young Jung Lee ),( Dong Young Choi ),( Yong Kyung Lee ),( Yeun Hee Lee ),( Ki Ho Kim ),( Young Heui Kim ),( Young Ho Jeon ),( Eun Hee Kim ),( Sang Bae Han ),( Jae Kyung Jung ),( Yeo 영남대학교 약품개발연구소 2012 영남대학교 약품개발연구소 연구업적집 Vol.22 No.0
Accumulations of amyloid-β (Aβ) and oxidative damage are critical pathological mechanisms in the development of Alzheimer`s disease (AD). We previously found that 4-O-methylhonokiol, a compound extracted from Magnolia officinalis, improved memory dysfunction in Aβ-injected and presenilin 2 mutant mice through the reduction of accumulated Aβ. To investigate mechanisms of the reduced Aβ accumulation, we examined generation, degradation, efflux and aggregation of Aβ in Swedish AβPP AD model (AβPPsw) mice pre-treated with 4-O-methylhonokiol (1.0 mg/kg) for 3 months. 4-O-methylhonokiol treatment recovered memory impairment and prevented neuronal cell death. Thismemory improving activity was associated with 4-O-methylhonokiol-induced reduction of Aβ1-42 accumulation in the brains of AβPPsw mice. According to the reduction of Aβ1-42 accumulation, 4-O-methylhonkiol modulated oxidative damage sensitive enzymes. 4-O-methylhonkiol decreased expression and activity of brain beta-site AβPP cleaving enzyme (BACE1), but increased clearance of Aβ in the brain through an increase of expressions and activities of Aβ degradation enzymes; insulin degrading enzyme and neprilysin. 4-O-methylhonkiol also increased expression of Aβ transport molecule, low density lipoprotein receptor-related protein-1 in the brain and liver. 4-O-methylhonkiol decreased carbonyl protein and lipid peroxidation, but increased glutathione levels in the brains of AβPPsw mice suggesting that oxidative damage of protein and lipid is critical in the impairment of those enzyme activities. 4-O-methylhonokiol treatment also prevented neuronal cell death in the AβPPsw mousee brain through inactivation of caspase-3 and BAX. These