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Aspergillus niger 에 있어서 섬유질 분해효소계의 동질효소 양상에 미치는 기질의 영향
정재훈,이영하,노재랑 한국균학회 1990 韓國菌學會誌 Vol.18 No.4
The influence of cellulosic and hemicellulosic substrates on the production of cellulase and xylanase complexes in Aspergillus niger was investigated. The culture conditions with different substrates exhibited profound effects on the level of endoglucanase (CMCase), β-glucosidase, endoxylanase and β-xylosidase, and on their isozyme patterns. However, intracellular and extracellular isozyme patterns of cellulase and xylanase complexes were qualitatively identical and appeared to be simultaneous in the early growth phase. Prolonged incubation led to the increase in the concentrations of isozymes with a little changes in the relative proportions of those isozymes. These results suggest that the biosynthesis of cellulase and xylanase complexes in A. niger is coordinately regulated at the level of induction. Moreover, multiple forms of extracellular cellulase and xylanase complexes seem to be the outcome of specific gene expression and should not be considered solely as the consequence of post-secretional modification of synthesized enzymes.
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정재훈 전남도립대학교 2009 전남도립대학교 논문집 Vol.11 No.-
Efficacy of antioxidative activity and antimicrobial activity of water extracts of Korean bamboo trees were investigated. Electron-donation ability of extracts from bamboo trees were 65.4% in Maengjongjuk, 57.2% in somdae, 50.2% in Wangdae and 42.5% in Jolitdae. The RC50 value of extract of maengjongjuk was 20.5 g/ml. Among the antimicrobial activities against Staphylococcus aureus, Somdae showed the strongest activity among 4 major bamboo trees cultivated in Korea. The extract of Somdae almost inhibited the growth of Staphylococcus aureus at over 500 mg/L concentration. These results suggest that water extract of Korean bamboo trees can be used in bioactive and functional material.
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Rotary type과 linear type 자동흡연 장치에 따른 담배연기 중 타르, 니코틴 및 일산화탄소의 함량 비교
정재훈,김영신,임흥빈,석영선,신주식,이학수 충북대학교 연초연구소 2004 煙草硏究 Vol.19 No.-
본 실험은 type별 흡연 장치의 담배 주류연 포집에 대한 차이를 비교하고자 주류연 중 일반적인 다량의 성분을 측정하였다. 1. 니코틴 함량은 대체로 linear-type 흡연 장치에서 높은 경향 이였으나 유의한 차이는 없었다. 2. 수분 함량은 두 가지 type 간에 유의한 차이는 없었다. 3. tar 함량은 저 농도에서 linear-type 보다 otary-type 흡연 장치가 높은 경향 이였으나 유의한 차이는 없었다. 4. 일산화탄소는 rotary-type과 linear-type 모두 유의한 차이는 없었다. 본 실험결과 ISO 표준 흡연 조건에서 담배 주류연의 tar, 니코틴, 일산화탄소 함량의 측정은 흡연 장치의 type별 통계적으로 유의한 차이는 없는 것으로 판단된다. This study was conducted to compare rotary-type with linear-type automatic smoking machine referred to ISO 3308 in the determination of tar, nicotine and CO in cigarette smoke. Sample were used with 4 kinds of domestic branded cigarettes(tar ; 1, 3, 6, 10 mg/cig) and CORESTA Monitor 4 cigarettes(tar ; 14 mg/cig). Tar and nicotine contents were analysed by gas-chromatograph methods in accordance with ISO 4387 and 10315-1. Determination of carbon monoxide in the vapour phase of cigarette smoke was meaured by NDIR method in ISO 8454. Sample preparation were performed in conditioning room at 22℃, 60 % for 48 hours according to ISO 3402. There was no significant difference between two smoking machine from 1 mg/cig to 14 mg/cig tar cigarettes, but, the contents of three components measured by rotary type showed higher tendency than those by linear type in the case of hight tar cigarettes. The results were the opposite in low tar cigarettes.
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박물관의 물리적 환경과 관람피로와의 관계에 관한 연구 : 관람자의 만족도를 중심으로
정재훈,이경훈 대한건축학회 2004 대한건축학회논문집 Vol.20 No.2
The purpose of the study is to analyze the causal relationship of physical environment and museum fatigue concerning how museum fatigue would take place and, in turn, what effects it could give visitors in the aspect of their satisfaction. The data gathered from 760 visitors in 30 museums were analyzed by the regression analysis and path analysis. The results of analysis indicated that, 1) museum fatigue was more likely to be affected by mental fatigue rather than physical one. mental fatigue had the direct influence on visitors' satisfaction, while physical fatigue only had the indirect effect. 2) the factors which affect on visitors' mental fatigue were contents of exhibition, thermal comfort, and rest area, those on visitor's physical fatigue were exhibition area, staying time, contents of exhibition, and thermal comfort. 3) visual and locomotor accessibility affected directly to visitors' satisfaction. and 4) individual characteristics did not show any influence on visitors' satisfaction and fatigue.
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