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강민혜 ( Min Hye Kang ),이정원 ( Jeong Won Lee ) 한국중등영어교육학회 2012 중등영어교육 Vol.5 No.1
The purpose of this study is to ascertain the effectiveness of using extensive reading in English reading classes and to suggest its application. This study was conducted through studying the major theories related to reading, scrutinizing the characteristics of extensive reading and its essential features, and suggesting the techniques that make this approach feasible in class. The findings of this study have the following conclusions for teaching and learning English reading: 1) extensive reading contributes to the improvement of overall reading comprehension; 2) extensive reading makes possible the integration of four English skills; 3) the level of materials in extensive reading is “i minus 1,” which means the level of materials should be slightly below the learner``s current English competence; 4) since extensive reading employs reading rapidly and extensively, both sight vocabulary and knowledge of vocabulary will be improved while reading. Practical suggestions of employing extensive reading in class are discussed.
Antioxidant and neuroprotective activities of Sasa borealis extracts
Min Hye Kang(강민혜),Yun Jeong Ji(지윤정),Su Ji Choi(최수지),Seung Eun Lee(이승은),Je Hun Choi(최재훈),Gwi Yeong Jang(장귀영),Kyung Hye Seo(서경혜),Hyung Don Kim(김형돈) 한국약용작물학회 2021 한국약용작물학회 학술대회논문집 Vol.2021 No.1
Background : The Sasa borealis (SB), a species of bamboo, is a medicinal plant. It is known that SB has diverse biological activities like anti-diabetic, anti-obesity, anti-inflammatory, etc. This study was performed to investigate the antioxidant and neuroprotective activities of SB. Methods and Results : Sasa borealis (SB) aerial parts were extracted using distilled water and 70% ethanol respectively, producing SB water extract (SBW) and SB 70% ethanol extract (SBE). Antioxidant components, such as total phenolic contents (TPC) and total flavonoid contents (TFC), of the extracts were determined and antioxidant activities of the extracts were measured by in vitro assays including 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acd) (ABTS) and 2,2’-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity. The intracellular reactive oxygen species (ROS) levels in neuronal cells were detected by 2’,7’-dichlorofluorescin diacetate (DCF-DA) assay. While TPC of SBE was higher than SBW, TFC of SBW was higher than SBE. In ABTS<sup>+</sup> and DPPH radical scavenging assay, SBE showed higher scavenging activity than SBW. And all SB extracts (SBW, SBE) significantly reduced the H2O2-induced ROS production in neuronal cells. Conclusion : Sasa borealis (SB) water and ethanol extracts have good antioxidant activities and ameliorated the H2O2-induced ROS production in neuronal cells. This result indicates that SB extracts can be promising candidates for further researches designed to treat and manage neurological disorders.
장귀영,최재훈,김형돈,서경혜,이승은,지윤정,강민혜,김동휘,최수지,Jang, Gwi Yeong,Choi, Je Hun,Kim, Hyung Don,Seo, Kyung Hye,Lee, Seung Eun,Jee, Yun Jeong,Kang, Min Hye,Kim, Dong Hwi,Choi, Su Ji 한국식품영양학회 2020 韓國食品營養學會誌 Vol.33 No.3
The aging treatment was applied to Rehmannia glutinosa rhizome (RGR) to improve the digestibility by the enzymatic hydrolysis of undigestible sugars. However, RGR spoils easily during the aging treatment. Thus, the purpose of this study was to investigate the influence of ethanol addition as preservatives on sugars and microbial growth of aged RGR. The RGR was treated with the addition of ethanol (0~10%) at 55℃ for eight days. Reducing, free sugars, and total bacterial counts of RGR with ethanol concentrations were analyzed during the aging periods. The aged RGR with 0-2% ethanol appeared spoiled in appearance, and total bacterial counts of these samples increased from 1.1×10<sup>5</sup> to 2.2×10<sup>7</sup> CFU and then decreased again. When treated with 4~10% ethanol, the total bacterial counts of aged RGR decreased by more than 99.9% at eight days. In all samples, reducing and digestible sugars increased, and stachyose decreased by the aging treatment. Sucrose content was highest in the 6% ethanol sample (18.2% at six days). These results indicate that the ethanol addition can be applied to the aging treatment of the RGR for improving qualities (sweetness, digestibility, and microbial growth), and can be considered for the stable production of high quality aged RGR.