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Antimicrobial Activity of Thinned Strawberry Fruits at Different Maturation Stages
Kim, Dong Sub,Na, Haeyoung,Song, Jeong Hwa,Kwack, Yurina,Kim, Sung Kyeom,Chun, Changhoo Korean Society of Horticultural Science 2012 원예과학기술지 Vol.30 No.6
Among the phenolic compounds that is generally present in strawberry fruits, five simple phenolics, three flavonoids, and a stilbene were tested for their antimicrobial activity against seven fungi and one oomycete. trans-Cinnamic acid showed strong antimicrobial activity, and the antimicrobial effect of the simple phenolics decreased with an increase in the number of hydroxyl groups. Phytophthora capsici was the most susceptible to the phenolic compounds tested in this study. trans-Cinnamic acid, p-hydroxybenzoic acid, and kaempferol were mainly detected in 'Seolhyang' strawberry fruits, and the total phenolic contents of the fruits decreased during their development. Extracts of the green (1-10% red color) and red (above 90% red color) strawberry fruits reduced the mycelial growth and zoospore germination rate of P. capsici, and the extract of red strawberry fruit showed strong antimicrobial activity against the zoospore germination of P. capsici. These results indicate that strawberry fruits contain antimicrobial phenolic compounds and that strawberry fruit extract can be used as a natural fungistat.
Composition of Secondary Metabolites in Various Parts of 'Seolhyang' Strawberry Plants
Kim, Dong Sub,Na, Haeyoung,Kwack, Yurina,Kim, Sung Kyeom,Heo, Jeong Wook,Chun, Changhoo Korean Society of Horticultural Science 2013 원예과학기술지 Vol.31 No.2
The objective of this study was to identify the content of phenolic and volatile organic compounds in edible and non-edible parts of 'Seolhyang' strawberry plants. We performed a comparative chemical analysis of the compounds found in roots, leaves, petioles, runners, and unripe and ripe fruits during vegetative propagation and reproductive growth. The contents of ellagic and gallic acids in the leaves of runner plants during vegetative propagation were $7.36{\pm}1.10$ and $5.07{\pm}3.66mg{\cdot}g^{-1}$ FW, respectively, and were higher than those in the other parts. The main volatile organic compound was identified as 3-hexen-1-ol, and it was mostly detected in leaves. The content of ellagic acid in leaves during reproductive growth was $12.96{\pm}2.30mg{\cdot}g^{-1}$ FW, while that in the other parts was below $6.00mg{\cdot}g^{-1}$ FW. The content of gallic acid in unripe fruits was $2.75{\pm}0.48mg{\cdot}g^{-1}$ FW and was higher than that in the other parts. Ripe fruits contained the lowest contents of ellagic and gallic acids but contained the most diverse volatile organic compounds, including sesquiterpenes, among the tested plant parts. The results indicate that non-edible parts (e.g., leaves and unripe fruits) of strawberry plants can be used as a raw material for antioxidant and anti-inflammatory agents, and edible parts (i.e., ripe fruits) can be available for making an essential oil.
Kim, Sung-Kyeom,Bae, Ro-Na,Chun, Chang-Hoo Korean Society of Horticultural Science 2011 원예과학기술지 Vol.29 No.3
The net photosynthetic rate of 'Seolhyang' strawberry plants was measured daily for 7 days after treatment at three UV illumination dosages (0, 9.8, and 29.5 $kJ{\cdot}m^{-2}$). The net photosynthetic rates of the strawberry plants with 9.8 and 29.5 $kJ{\cdot}m^{-2}$ UV light illumination decreased by 20.2 and 61.4%, respectively, at 7 days after UV light treatments. UV treatments with two illumination dosages (7.9 and 15.7 $kJ{\cdot}m^{-2}$) altered the phenolic compounds contents during the cultivation period when compared to those in the control fruits. The anthocyanin content with 7.9 $kJ{\cdot}m^{-2}$ UV light illumination of 'Seolhyang' increased by 18.7% compared with those in control fruits at the 11 DAT. However, the anthocyanin content of 'Maehyang' was not significantly different among treatments during experiment period. The highest level of ellagic acid was found with 7.9 $kJ{\cdot}m^{-2}$ UV light illumination in both cultivars at the 11 DAT. Our results showed that strawberries illuminated with UV light during cultivation period had higher bioactive compounds contents than control fruits. These results suggest that UV light treatments may be a useful non-chemical way of promoting strawberry fruits quality.
Kim, Jae Kyeom,Shin, Eui-Cheol,Lim, Ho-Jeong,Choi, Soo Jung,Kim, Cho Rong,Suh, Soo Hwan,Kim, Chang-Ju,Park, Gwi Gun,Park, Cheung-Seog,Kim, Hye Kyung,Choi, Jong Hun,Song, Sang-Wook,Shin, Dong-Hoon Hindawi Publishing Corporation 2015 Journal of analytical methods in chemistry Vol.2015 No.-
<P>Few studies have investigated <I>Seomae</I> mugwort (a Korean native mugwort variety of <I>Artemisia argyi</I> H. Lév. & Vaniot), exclusively cultivated in the southern Korean peninsula, and the possibility of its use as a food resource. In the present study, we compared the nutritional and chemical properties as well as sensory attributes of <I>Seomae</I> mugwort and the commonly consumed species <I>Artemisia princeps</I> Pamp. In comparison with <I>A. princeps, Seomae</I> mugwort had higher contents of polyunsaturated fatty acids, total phenolic compounds, vitamin C, and essential amino acids. In addition, <I>Seomae</I> mugwort had better radical scavenging activity and more diverse volatile compounds than <I>A. princeps</I> as well as favorable sensory attributes when consumed as tea. Given that scant information is available regarding the <I>Seomae</I> mugwort and its biological, chemical, and sensory characteristics, the results herein may provide important characterization data for further industrial and research applications of this mugwort variety.</P>
Nonvolatile Memory Characteristics of Double-Stacked Si Nanocluster Floating Gate Transistor
Kim, Eun-Kyeom,Kim, Kyong-Min,Son, Dae-Ho,Kim, Jeong-Ho,Lee, Kyung-Su,Won, Sung-Hwan,Sok, Jung-Hyun,Hong, Wan-Shick,Park, Kyoung-Wan The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.1
We have studied nonvolatile memory properties of MOSFETs with double-stacked Si nanoclusters in the oxide-gate stacks. We formed Si nanoclusters of a uniform size distribution on a 5 nm-thick tunneling oxide layer, followed by a 10 nm-thick intermediate oxide and a second layer of Si nanoclusters by using LPCVD system. We then investigated the memory characteristics of the MOSFET and observed that the charge retention time of a double-stacked Si nanocluster MOSFET was longer than that of a single-layer device. We also found that the double-stacked Si nanocluster MOSFET is suitable for use as a dual-bit memory.
Sang Ho Rha,Un Ki Kim,Jisim Jung,Hyo Kyeom Kim,Yoon Soo Jung,Eun Suk Hwang,Yoon Jang Chung,Mijung Lee,Jung-Hae Choi,Cheol Seong Hwang IEEE 2013 IEEE transactions on electron devices Vol.60 No.3
<P>Asymmetric Schottky contact thin-film-transistors (ASC-TFTs) with an amorphous- In<SUB>2</SUB>Ga<SUB>2</SUB>ZnO<SUB>7</SUB> channel were fabricated, and their operation characteristics were examined. Ti, Ni, and Pt were evaluated as source/drain metal, and the variations in the device performance were analyzed in terms of energy level and bias polarity, which were carefully simulated to understand the influence of the contact properties on the device performance. The contact nature largely influenced the distribution of potential under the given gate and drain biases, as well as the accompanying carrier accumulation layer and current path formation. Schottky-type contact induced conduction path formation even on the back surface of the channel when drain voltage was high even with sufficiently high gate bias being applied. Based on these results, by applying different metal for each source and drain metal, ASC-TFTs integrating TFTs and Schottky diodes were fabricated, which showed a rectification ratio of drain current higher than 10<SUP>8</SUP> according to the bias direction. In addition, the transfer and output characteristics of ASC-TFTs were evaluated for various operation regimes, and the roles of the Schottky junction in device operation were studied in detail.</P>