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RISS 인기검색어
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- 저자 : 원보미 (검색결과 2 건)
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대학생의 SNS에서 상향비교가 열등감에 미치는 영향: 친밀감의 조절효과
본 연구는 성별에 따른 대학생의 SNS에서 상향비교와 열등감의 관계를 살펴보고, 친밀감의 조절효과를 검증하고자 하였다. 이를 위해 온라인 설문조사를 통하여 전국 4년제 대학생의 215명의 자료를 수집하였다. 수집된 자료는 SPSS 22과 Process Macro를 통해 기술통계분석과 상관분석을 실시하였으며, 연구의 결과는 다음과 같다. 첫째, 남녀간 차이를 검증한 결과 SNS에서 여성이 상향비교를 더 자주 경험하는 것으로 나타났다. 둘째, 상향비교와 열등감의 관계에서 정적인 상관이 있는 것으로 나타났다. 셋째, 상향비교와 열등감의 관계에서 친밀감의 조절효과가 드러났다. 이는 SNS를 사용하는 대학생이 나보다 나은 삶을 살고 있는 것처럼 보이는 사람들을 보며 심리적으로 가깝고 친밀한 사이라고 느끼는 정도가 열등감을 예측함을 가리킨다. 마지막으로 본 연구결과를 토대로 본 연구의 의의와 한계점 및 제언에 대하여 논의하였다. The purpose of this study was to examine the relationship between upward social comparison and Inferiority in SNS of college students, and to verify Moderating effect of intimacy. To this end, data of 215 college students across the country were collected through an online survey. For the collected data were analyzed for technical statistics and correlations through SPSS 22 and Process Macro. The results of this study are as follows. First, it was found that there was a positive correlation in the relationship between upward comparison and inferiority. Second, the moderating effect of intimacy was revealed in the relationship between upward comparison and inferiority. This indicates that the degree to which college students who use SNS feel psychologically close and intimate while looking at people who seem to be living a better life than me predicts a sense of inferiority. Finally, based on the results of this study, the significance, limitations, and suggestions of this study were discussed.
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Enzymatic transformation of ginsenosides using β-Glycosidase under high-hydrostatic pressure
원보미 Graduate School, Yonsei University 2009 국내석사
The purpose of this study was to convert major ginsenosides into the minor ginsenosides using β-glycosidase under high-hydrostatic pressure (HHP). Ginsenosides, as glycosylated triterpenes, are principal bioactive ingredients in ginseng. Five major ginsenosides (Rb1, Rb2, Rc, Re and Rg1) constitute more than 80% of the total ginsenosides. However, the absorption of naturally occurring major ginsenosides by the gastrointestinal tract is poor. Many studies have been directed towards converting major ginsenosides to the more active minor ginsenoside using enzyme treatment. β-Glycosidase has not only act on the disaccharide glycoside to release the saccharides in a disaccharide unit but also cut the glycosidic linkage of monoglycoside. Moreover, it has an activity to cut the glycosidic linkage of the modified glycoside. So, this enzyme has broad regiospecific cleavage activity and is able to hydrolyze multiple ginsenosides. HHP accelerates the enzyme reaction that is accompanied by a decrease in volume on the formation of the transition state. To confirm the effect of various factors affecting enzyme activity of β-glycosidase, the enzyme activity was assayed with mixture containing p-nitrophenyl-glucopyranoside (pNPG), citrate-phosphate buffer and the enzyme. The optimal activity against pNPG was obtained at pH 4.5, 60 ºC and 100 MPa pressure. Effects of enzyme reactions under HHP on contents of crude saponin and ginsenoside compositions in fresh ginseng (FG), white ginseng (WG) and red ginseng (RG) were investigated. Enzyme reaction containing β-glycosidase was carried out at 50 ºC for 24 h under atmosphere and 100 MPa. According to experimental results, contents of crude saponin increased after the enzyme reaction in all kinds of ginseng extracts. And contents of crude saponin in RG extract after the enzyme reaction under 100 MPa showed that the highest contents were 20.7 mg/g ginseng. In addition, the conversion rate of ginsenosides of the enzyme reaction under 100 MPa was higher than that of the enzyme reaction under atmosphere. β-Glycosidase is able to hydrolyze ginsenoside Rb1, Rb2, Rc, Re and Rg2 into ginsenoside Rd, Rg3, Rg1 and Rh1 in all kinds of ginseng extracts. The levels of ginsenoside Rd, Rg3, Rg1 and Rh1 in the RG extract increased 494%, 78%, 55% and 99%, respectively, while the levels of ginsenoside Rb1, Rb2, Rc, Re and Rg2 in the RG extract decreased 47%, 39%, 98%, 100% and 100%, respectively, after the enzyme reaction under 100 MPa. In detail, the minor ginsenoside Rd was accumulated by hydrolyzing one saccharide unit attached at C-20 of ginsenoside Rb1, Rb2 and Rc. And Rd was converted into Rg3 by hydrolyzing one glucose unit attached at C-20 of Rd. β-Glycosidase can hydrolyze Re and Rg1 to Rg2 and Rh1 respectively, by hydrolyzing the one glucose unit attached at C-6. Consequently, these results indicate that β-glycosidase could hydrolyze β-(1->6)-glycosidic linkage at C-20 of protopanaxadiol ginsenosides and β-(1->2)-glycosidic linkage at C-3 of protopanaxatriol ginsenosides. In this study, we found that the β-glycosidase can convert the major ginsenosides such as ginsenoside Rb1, Rb2, Rc and Re into the minor ginsenosides such as ginsenoside Rd, Rg3 and Rh1. And enzymatic transformation under HHP was useful in the modification of the ginsenosides.
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