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- 저자 : 정연아(Youn A. Jung) (검색결과 3 건)
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최현정(Hyun J. Choi),정연아(Youn A. Jung) 한국보육지원학회 2021 한국보육지원학회지 Vol.17 No.4
Objectives:This study aims to explore the experiences of women who take acareer break while working in daycare center as a teacher assistant. Methods: Seven assistant teachers and two child care teachers who took morethan two years of career break were selected and given in-depth interviews over17 weeks from August to December in 2020. Results: The results of this study are as follows. First, the women experiencedthe need for a career transition as an assistant teacher because it was time to fora change. Second, while working as a teacher assistant, they had variousexperiences and meanings in the process of career transition while playing therole as a teacher in daycare centers. Third, they also had some difficulties inconflict and some needs to build their professional expertise as a teacher. Conclusion/Implications: The study is expected to give insights to understandth e difficulties of teachers who had experienced the need for a career transitionas teacher assistant and to provide important data to develop teacher professionaldevelopment.
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천연방부제 개발을 위한 자원식물을 활용한 발효 전·후 물질 변화와 항균활성 비교
정서아,정연옥,송가현,박노복,Seo A Jung,Youn Ok Jung,Ga Hyeon Song,No Bok Park 국립한국농수산대학교 교육개발센터 2023 현장농업연구지 = Journal of practical agricultural resear Vol.25 No.1
Chemical preservatives have a good effect on antibacterial activity, but many side effects on the human body have been reported. Recently, the development of natural preservatives that are harmless to the human body and have preservative functions and self-efficacy is active. In addition, in order to increase the absorption rate of natural products by the human body, the method of fermentation using strains is also increasing. Therefore, this study selected varieties that are harmless to the human body and have good antibacterial activity. 1. The yield of origin, thickness and solvent was investigated. Scutellaria baicalensis Georgi was made in China and received a yield of 21.88% from 50% ethyl alcohol extract. Salvia miltiorrhiza Bunge was made in Korea and received a yield of 25.62% from 50% ethyl alcohol extract. Dryopteris crassirhizoma Nakai was made in China and received a yield of 6.50% from 70% ethyl alcohol extract. 2. The solid fermentation with the S. baicalensis and S. miltiorrhiza with B. Subtilis yield gained 24.40%, 39.30%, and D. crassirhizoma obtained 11.10% yield when fermented with L. casei. 3. After the liquid fermentation, a clear zone of 9mm was identified for the S. aureus strain in the S. baicalensis, and the antibacterial activity was not confirmed in S. miltiorrhiza and D. crassirhizoma. 4. When the S. baicalensis was fermented with L. Casei, it showed high antibacterial activity in C. albicans and S. aureus. S. miltiorrhiza showed antibacterial activity in S. aureus when it was solid with S. cerevisiae. When the spectators were solid with L. casei and S. cerevisiae, antibacterial activity was high in E. coli and S. aureus. Overall, the antibacterial activity after fermentation was much higher than when fermented. 5. The change in active ingredients was baicalin 101.57, baicalein 28.26, and wogonin 5.33mg/g in the S. baicalensis that did not ferment solid. When solid fermentation with S. cerevisiae, the content of baicalinin with baicalin 94.31, baicalein 30.41, and wogonin 3.57mg/g was found to have increased. S. miltiorrhiza that was not fermented, salvianolic acid A was 1.82mg/g, and when fermented with S. cerevisiae, it increased to 5.70mg/g. The active ingredients of the spectators were flavaspidic acid AP, flavaspidic acid PB, flavaspidic acid AB, and flavaspidic acid BB.
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<Benzo-[f]-indole>-4, 9-dione 유도체의 합성
이지영,강정숙,권은경,변정연,최경아 이화여자대학교약학회 1990 梨花藥學硏究 Vol.- No.29
Benzo-[f]-indole4,9-dione derivatives were prepared from 2-Chloro-3-(α-acetyle-α-ethoxy carbonyl-methyl)-1,4-naphthoquinone and 2-Chloro-2 anilino-1,4-naphthoquinone. 2-Chloro-3-(α-acetyle-α-tthoxy carbonyl methyl)-1,4-naphthoquinone with alkyl and aryl amine to give 2-amino-3-(α-acetyl-α-ethoxy carbonyl methyl)-1,4 naphthoquinone derivatives. Subsequent treatment of 2-Amino-3-(α-acetyl-α-ethoxy carbonyl methyl-1,4-naphthoquinones with sodium ethoxide gave Benzo-[f]-indole-4,9-dione derivatives. When 2-Chloro-3N-phenyl amino-1,4-naphthoquinone reacted with sodium α-cyano ethyl acetate, 2-amino-3-ethoxy carbonyl-benzo-[f]-indole-4,9-dione was formed.
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