Effect of Onion (Allium cepa L.) Flesh and Peel Fraction on Cognitive Function and Industrial Availability Assessment

Seon Kyeong Park,Jin Yong Kang,Jong Min Kim,Bong Seok Kwon,Sang Hyun Park,Chang Jun Lee,Jeong Eun Kang,Su Bin Park,Seul Ki Yoo,Ho Jin Heo 한국식품영양과학회 2017 한국식품영양과학회 학술대회발표집 Vol.2016 No.10

부친부재 아동과 일반 아동간의 성상동형 비교 연구

강훈경,고선주,김수용,김연경,김영미,백경심,석은선,안영남,이기정,이은정,이지수,홍성숙 연세대학교 생활과학대학 1988 婦學 Vol.21 No.-

The purpose of this study was to examine the relationship between father absence and children's sex-role stereotypes. The subjects of this study were 36 father absent children and 40 father present boys and girls totaling 76 children. They were 13 years of age. The instrument used for this study was a questionnaire based on The Bem Sex-role Inventory. The data of the present study were analyzed by the statistical method of t-test. The results showed a significant difference between the two groups on some items: 1) on the boys' masculinity scale, father present boys had higher scores that father absent boys on “sincere” and “faithful”; 2) on the boys' feminity scale, father present boys had higher scores than father absent boys on “help a person” but father absent boys had higher scores than father present boys on “compel”; 3) on the girl's masculinity scale, father present girls had higher scores than father absent girls on “help a person” but father absent girls had higher scores than father present girls on “happy” and “talk softly”; 4) on the girls, feminity scale, father present girls had higher scores than father absent girls on “concede”, “friendly”, “sensitive”, and “gentle”. The results were discussed in terms of proverty, the lack of sex-role model caused by father absence, and mother's change in child rearing attitude.

Study on Growth Parameters for Monolayer MoS₂ Synthesized by CVD Using Solution-based Metal Precursors

Seon Kyeong Kang,Hyun Seok Lee 한국진공학회(ASCT) 2019 Applied Science and Convergence Technology Vol.28 No.5

Two-dimensional (2D) materials have received a considerable amount of attention owing to their unique properties compared with those of bulk materials, such as ultralow thickness with no dangling bonds and direct bandgap for monolayers. Monolayer MoS₂ with a direct bandgap of ~1.8 eV is representative of 2D semiconductors, which can facilitate a high on/off ratio in field-effect transistors and can have various optoelectronic applications in the visible range. Large area MoS₂ monolayers are generally synthesized using chemical vapor deposition (CVD) methods, where various types of metal precursors are utilized. Here, we report the effects of process parameters on the growth mode of MoS₂ monolayers prepared by CVD using solution-based metal precursors. We investigated various growth modes of MoS₂ flakes depending on the growth temperature and time, Mo-precursor concentration in precursor solutions, and carrier gas amount. The synthesized MoS₂ monolayers revealed typical n-type semiconductor behaviors, which were investigated by optical microscopy, confocal photoluminescence and Raman spectroscopy, atomic force microscopy, and I–V characterization of field-effect transistors. The n-doping effect was reduced by removing unreacted precursors after transferring the MoS₂ layer on new SiO₂/Si substrates.

Soil Characteristics of Newly Reclaimed Tidal Land and Its Changes by Cultivation of Green Manure Crops

Kyeong-Bo Lee,Jong-Gook Kang,Kyeong-Do Lee,Sanghun Lee,Seon-Ah Hwang,Seon-Woong Hwang,Hong-Kyu Kim 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.2

This study was conducted to investigate the soil characteristics of newly reclaimed tidal land and the effect of green manure crops on soil properties. Summer green manure crops such as sesbania (Sesbania grandiflora), barnyard grass (Echinochloa spp.) and sorghum×sudangrass hybrid (Sorghum bicolor L.) were cultivated at Hwaong, Ewon, Saemangeum and Yongsangang area. Soil pH of reclaimed tidal land was relatively high, but organic matter and available phosphorus contents were lower compared to the optimum range for common upland crops. Soil nutrient contents were unbalanced for upland crop growth. Yield of green manure crops had a wide spatial variation. Nitrogen content in green manure crops was the greater in Sesbania and it was estimated that major nutrient (N-P₂O5-K₂O) supply amount were 150-40-370, 220-50-170 and 140-50-250 kg ha<SUP>-1</SUP> from sorghum×sudangrass hybrid, sesbania and barnyard grass, respectively. Based on these results, desalination is required to grow the upland crops at newly reclaimed tidal lands and management practices are necessary to reduce the salt damage by resalinization during the growing seasons. To improve the productivity and increase the nutrient utilization rate, soil physicochemical properties need to be improved to the level for upland crops by application of organic matter and fertilizer.

Soil Characteristics of Newly Reclaimed Tidal Land and Its Changes by Cultivation of Green Manure Crops

Lee, Kyeong-Bo,Kang, Jong-Gook,Lee, Kyeong-Do,Lee, Sanghun,Hwang, Seon-Ah,Hwang, Seon-Woong,Kim, Hong-Kyu 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.2

This study was conducted to investigate the soil characteristics of newly reclaimed tidal land and the effect of green manure crops on soil properties. Summer green manure crops such as sesbania (Sesbania grandiflora), barnyard grass (Echinochloa spp.) and sorghum${\times}$sudangrass hybrid (Sorghum bicolor L.) were cultivated at Hwaong, Ewon, Saemangeum and Yongsangang area. Soil pH of reclaimed tidal land was relatively high, but organic matter and available phosphorus contents were lower compared to the optimum range for common upland crops. Soil nutrient contents were unbalanced for upland crop growth. Yield of green manure crops had a wide spatial variation. Nitrogen content in green manure crops was the greater in Sesbania and it was estimated that major nutrient ($N-P_2O_5-K_2O$) supply amount were 150-40-370, 220-50-170 and 140-50-250 $kg\;ha^{-1}$ from sorghum${\times}$sudangrass hybrid, sesbania and barnyard grass, respectively. Based on these results, desalination is required to grow the upland crops at newly reclaimed tidal lands and management practices are necessary to reduce the salt damage by resalinization during the growing seasons. To improve the productivity and increase the nutrient utilization rate, soil physicochemical properties need to be improved to the level for upland crops by application of organic matter and fertilizer.

Trimethyltin 유도성 인지기능 저하 동물 모델에 대한 들기름의 개선효과

강진용(Jin Yong Kang),박보경(Bo Kyeong Park),승태완(Tae Wan Seung),박창현(Chang Hyeon Park),박선경(Seon Kyeong Park),진동은(Dong Eun Jin),강성원(Sung Won Kang),최성길(Sung-Gil Choi),허호진(Ho Jin Heo) 한국식품과학회 2015 한국식품과학회지 Vol.47 No.3

본 연구에서는 들기름의 TMT 유도성 인지 기능 상실에 대한 개선 효과와 함께 가정에서 식용유로서 사용량이 많은 대두유와 그 효과를 비교·연구하였다. 실험에서 들기름과 대두유를 섭취한 마우스를 TMT로 인지 기능 손상을 유발하여 Y-maze test와 Morris water maze test 한 결과, 공간 인지 기능 및 학습능력 개선에 대해 대두유는 효과가 미비하였으나 들기름은 대조군과 유의적인 차이가 없는 정도의 유의적 개선 효과를 보였다. 동물 실험 후 mouse로부터 적출된 뇌 조직을 대상으로 AChE 활성, MDA 함량, SOD 활성 측정 및 산화된 glutathione 측정한 결과, 대두유는 TMT 단독 처리군의 경우와 유사한 반면 들기름은 TMT에 의해 손상을 입은 mice의 뇌 조직에서 AChE의 활성과 MDA 생성 및 GSH의 산화를 억제시킬 뿐만 아니라 SOD 활성을 유의성 있게 증가시킨 것으로 나타났다. 이러한 결과는 들기름에 존재하는 풍부한 생리 활성 물질로서 ω-3계 지방산, 페놀화합물 그리고 비타민 E 등에 의한 것으로 사료된다. 결국 들기름은 상대적으로 우수한 인지 기능 개선 효과를 나타냈고, 이는 건강기능식품으로서 고부가가치 소재로 활용될 수 있는 산업적 활용 가능성을 나타내는 것으로 판단된다. This study aimed to investigate the anti-amnesic effect of perilla oil against trimethyltin (TMT)-induced learning and memory impairment in ICR mice. Perilla oil (2.5 mL/㎏ of body weight) and soybean oil (2.5 mL/㎏ of body weight) were administered orally to mice for 3 weeks, and at the end of the experimental period, cognitive behavior was examined by Y-maze and Morris water maze (MWM) tests. Behavioral tests showed that the mice treated with perilla oil had improved cognitive function compared to that in mice administered soybean oil. Analysis of brain tissue showed that perilla oil significantly lowered acetylcholinesterase activity and malondialdehyde (MDA) levels. Oxidized glutathione (GSH)-to-total GSH ratio also decreased from 10.4% to 5.3% in perilla oil-treated mice, but superoxide dismutase (SOD) activity increased from 11.7 to 14.2 U/㎎ protein. Therefore, these results suggest that the perilla oil could be a potential functional substance for improving cognitive function.

감초폴리페놀 추출효율에 있어 열처리, 에탄올 농도, 추출시간 및 용매비율이 미치는 영향 탐색

Chae Jung-Il,Ryu Kyeong-Seon,Seo Kang-Seok,Kim Kyung-Hoon,Oh Young-Kyoon,Jang Sun-Sik,Choi Chang-Weon,Choi Nag-Jin 한국유기농업학회 2012 韓國有機農業學會誌 Vol.20 No.3

Effects of pretreatment and extraction conditions on total polyphenol yield from licorice root were investigated using statistical method. For pretreatment, heat treatment at 121°C for 10 min was applied. Licorice root content in solvent (10, 20, and 30%) ethanol concentration (20, 40, and 60%) and reaction time (1, 2, and 3 h) were used as variables for extraction conditions. Two experiments, with heat treated and no treated licorice, were prepared with same experimental design. Box behnken design was employed and produced a total of 15 trials. Total polyphenol yield from licorice root was not affected by heat treatment. Among variables, licorice content in solvent showed most significant effect regardless of other variables (p

Short Tandem Repeat(STR)System HUMCYAR04 in Korean Population

강순자,선문숙,황선경 한국유전학회 1996 Genes & Genomics Vol.18 No.4

A genetic population study for the tetrameric STR, the HUMCYAR04 in the Korean population was carried out. Typing for the HUMCYAR04 of 236 unrelated Koreans was done by PCR and PAGE-silverstaining. Eight alleles were observed and their frequencies were in the range of 0.0042-0.3491. Allele 5, 6, and 10 were higher frequencies than other alleles. No significant deviations from Hardy-Weinberg equilibrium could be observed in the genotype distribution. The observed heterozygosity was 0.7426 and the PIC value was 0.7268. The power of discrimination (PD) was 0. 8906 and the chance of exclusion (CE) was 0.4809. There is no significant difference in the allele frequencies at the HUMCYAR04 locus between Koreans and Asians. However, the Koreans did slightly differ for the allele frequencies when compared with Mexican-Americans, Blacks, and Caucasians.

Protective Effect of Fucoidan Extract from Ecklonia cava on Hydrogen Peroxide-Induced Neurotoxicity

( Seon Kyeong Park ),( Jin Yong Kang ),( Jong Min Kim ),( Sang Hyun Park ),( Bong Seok Kwon ),( Gun-hee Kim ),( Ho Jin Heo ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.1

We evaluated the antioxidant activity and neuronal cell-protective effect of fucoidan extract from Ecklonia cava (FEC) on hydrogen peroxide (H₂O₂)-induced cytotoxicity in PC-12 and MCIXC cells to assess its protective effect against oxidative stress. Antioxidant activities were examined using the ABTS radical scavenging activity and malondialdehyde-inhibitory effect, and the results showed that FEC had significant antioxidant activity. Intracellular ROS contents and neuronal cell viability were investigated using the DCF-DA assay and MTT reduction assay. FEC also showed remarkable neuronal cell-protective effect compared with vitamin C as a positive control for both H₂O₂-treated PC-12 and MC-IXC cells. Based on the neuronal cellprotective effects, mitochondrial function was analyzed in PC-12 cells, and FEC significantly restored mitochondrial damage by increasing the mitochondrial membrane potential (Δψm) and ATP levels and regulating mitochondrial-mediated proteins (p-AMPK and BAX). Finally, the inhibitory effects against acetylcholinesterase (AChE), which is a critical hydrolyzing enzyme of the neurotransmitter acetylcholine in the cholinergic system, were investigated (IC₅₀ value = 1.3 mg/ml) and showed a mixed (competitive and noncompetitive) pattern of inhibition. Our findings suggest that FEC may be used as a potential material for alleviating oxidative stress-induced neuronal damage by regulating mitochondrial function and AChE inhibition.

Selective Molecular Separation on Ti₃C₂T<i>_x</i>–Graphene Oxide Membranes during Pressure-Driven Filtration: Comparison with Graphene Oxide and MXenes

Kang, Kyoung Min,Kim, Dae Woo,Ren, Chang E.,Cho, Kyeong Min,Kim, Seon Joon,Choi, Jung Hoon,Nam, Yoon Tae,Gogotsi, Yury,Jung, Hee-Tae American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.51

<P>In this work, we prepared 90 nm thick Ti3C2Tx-graphene oxide (GO) membranes laminated on a porous support by mixing GO with Ti3C2Tx. This process was chosen to prevent the penetration of target molecules through inter-edge defects or voids with poor packing. The lattice period of the prepared membrane was 14.28 angstrom, as being swelled with water, resulting in an effective interlayer spacing of around 5 angstrom, which corresponds to two layers of water molecules. The composite membranes effectively rejected dye molecules with hydrated radii above 5 angstrom, as well as positively charged dye molecules, during pressure-driven filtration at bar. Rejection rates were 68% for methyl red, 99.5% for methylene blue, 93.5% for rose Bengal, and 100% for brilliant blue (hydrated radii of 4.87, 5.04, 5.88, and 7.98 angstrom, respectively). Additionally, the rejections of composite membrane were compared with GO membrane and Ti3C2Tx membrane.</P>