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New Korean Ginseng Cultivar ‘Cheonmyeong’ with High Yield and Rusty Root Tolerance
Jang-Uk Kim,Young-Chang Kim,Dong-Hwi Kim,Jung-Woo Lee,Kyong-Hwan Bang,Dong-Yun Hyun,Myeong-Hwan Jang,Bong-Jae Seong,Gun-Hwan Park,Ye-ji Yoon,Ick-Hyun Jo 한국원예학회 2021 원예과학기술지 Vol.39 No.1
In 2008, a new Panax ginseng (ginseng) cultivar, ‘Cheonmyeong’, was bred by pure-line selection for tolerance to physiological disorders using a genetic resource collected from the farm race field, Buyeo, Chungnam, Korea. In 2019, ‘Cheonmyeong’ was registered as a new breed by the Korea Seed and Varieties Service (grant number 7467) and accorded plant breeders’ rights. ‘Cheonmyeong’ has a yellowish orange pericarp, which has not been previously reported. ‘Cheonmyeong’ sprouted and flowered 2 days earlier than the control cultivar ‘Chunpoong’, and its fruit-ripening period occurred 3 days earlier. ‘Cheonmyeong’ had 1.5-fold more stems per plant than ‘Chunpoong’. ‘Cheonmyeong’ plants were characterized by a lower occurrence of rusty root disease, and had approximately 28% higher 4-year-old root yields (571.8 ± 99.7 kg·10a<SUP>-1</SUP>) than those of the rusty root-tolerant ‘Chunpoong’ (444.1 ± 110.4 kg·10a<SUP>-1</SUP>). The total ginsenoside content of ‘Cheonmyeong’ (31.70 ± 1.83 mg·g<SUP>-1</SUP>) was higher than that of ‘Chunpoong’ (26.62 ± 1.60 mg·g<SUP>-1</SUP>). Concentrations of the ginsenosides Rg1 (which improves human memory and learning), Rf (which is effective for neuronal oscillation), and Rc (which has anti-inflammatory and analgesic effects) were higher in ‘Cheonmyeong’ than in ‘Chunpoong’. ‘Cheonmyeong’ is likely to have strong tolerance against physiological disorders, ensuring reliable production of ginseng, even in response to changes in the cultivation environment.
박예슬(Ye Seul Park),남건희(Gun He Nam),조경조(Kyung Jo Jo),곽혜원(Hye Won Kawk),김명진(Myeong Jin Kim),김종태(Jong Tae Kim),장승희(Seung Hee Jang),김민정(Min Jeong Kim),김영민(Young Min Kim) 한국생물공학회 2020 KSBB Journal Vol.35 No.1
Obesity is caused by a variety of reasons, such as diet, genetics, and environmental factors. Here the effect of Barley sprout extract on the differentiation of 3T3-L1 and the expression of adipogenesis was studied. MTT assay for cell toxicity was performed and found to be non-toxic at 3T3-L1, with a survival rate of 90% or higher in Barley sprout extract at all concentrations. The results of oil red O assay, after inducing differentiation by treating the fat formation with insulin, dexamethasone, and IBMX powder-inducing substances at 3T3-L1, showed that the Barley sprout extract inhibited fat formation. The results of a triglyceride assay for the determination of quantitative inhibition of fat formation showed 42.2% and 45.7% in Barley sprout extracts of 50% and 70%, respectively. Western blot was performed to identify the proteins involved in fat cell suppression, and it was found that there was a concentration-dependent decrease in C/EBPα, PPARγ, and p-ACC proteins. Thus, Barley sprout ethanol extract regulates the expression of protein involved in inhibiting fat cells, thereby reducing the differentiation of fat cells and triglyceride production and indicating that it is effective against obesity.
Investigation on the Effect of Low Temperature Micro Cutting Process for Mold Core Material
Kim, Gun-Hee,Yoon, Gil-Sang,Son, Jong-In,Cho, Myeong-Woo 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.5
Generally, micro cutting process has much higher specific cutting energy and more vulnerable tool volumes and strength compared to conventional cutting process. Besides, these characteristics of micro cutting processes which make much more tool wear and burr occur due to the cutting heat generated during processing greatly deteriorate the quality of cutting feature. In this study, the low temperature micro cutting process was proposed that can secure favorable the quality of micro cutting features by the tool wear reduction and cutting heat cooling and micro cutting experiments were performed under various cutting lubrication conditions. In order to analyze the characteristics of processing by cutting lubrication condition, cutting force monitoring using tool dynamometer, FFT analysis of micro cutting force data, the analysis of tool wear images and the SEM images analysis of fabricated micro slot feature were conducted. Finally, the efficiency of proposed micro cutting process was verified by the total results of abovementioned analysis processes.
The role of nitric oxide in ocular surface diseases
Gun Sic Park,Nyoun Soo Kwon,Young Myeong Kim,Jae Chan Kim 대한안과학회 2001 Korean Journal of Ophthalmology Vol.15 No.2
The role of nitric oxide (NO) in ocular surface diseases remains unknown. We investigated the conditions leading to increase NO generation in tears and the main sources of ocular surface tissue. We evaluated the possibility of a dual action (cell survival or cell death) depending on the amount of NO. The concentration of nitrite plus nitrate, the stable end-product of NO, was measured in the tears of various ocular surface diseases. We also examined the main source of nitric oxide synthase (NOS) using immunohistochemical staining & Western blot analysis. When cultured human corneal fibroblasts were treated with NO producing donor with or without serum, the viability of cells was studied. We found that sources of NO in ocular surface tissue primarily included corneal epithelium, fibroblasts, endothelium and inflammatory cells. Three forms of NOS (eNOS, bNOS, & iNOS) were expressed in experimentally induced inflammation. Cell death by NO revealed TUNEL positive staining, however in the EM finding, this NO specific cell death was an atypical necrosis showing perinuclear large vacuolization and mitochondrial swelling. In the fibroblasts culture system, the NO donor (SNAP, S-nitroso-N-acetyl-D, L-penicillamine) prevented the death of corneal fibroblasts caused by serum deprivation in a dose dependent manner up to 500(m SNAP, although a higher dose decreased cell viability. This study suggested that NO might act as a double-edged sword in ocular surface disease depending on the degree of inflammatory condition related with NO concentration.
Electrical Properties of Organic/Inorganic Hybrid Composites for Insulation Materials
Kim, Sang-Cheol,Ok, Jeong-Bin,Aho, Myeong-Jin,Park, Do-Hyun,Lee, Gun-Joo The Korean Institute of Electrical and Electronic 2002 Transactions on Electrical and Electronic Material Vol.3 No.1
In this work, the surface of inorganic fillers were modified with some functional groups such as stearic acid, aliphatic long chain, vinylsilane and aminosilane to control the interaction between inorganic fillers and polymer matrix. Ethylene-vinyl acetate copolymers (EVA) with various amount of vinyl-acetate and copolyether-ester elastomer were used as polymer matrix. The addition of inorganic fillers increases flame retardancy, but results in steep drop of electrical and mechanical properties, which may be caused by the defects in the interface between organic/inorganic hybrid composites. The hybrid composites are found to show better mechanical properties and higher volume resistivities as inorganic fillers are well dispersed and have good adhesion with polymer matrix. Also, the most effective type of functional group coated on fillers depends on the chemical structure of polymer.
Jeong, Myeong Hoon,Sanger, Amit,Kang, Sung Bum,Jung, Yeon Soo,Oh, In Seon,Yoo, Jung Woo,Kim, Gun Ho,Choi, Kyoung Jin The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.32
<P>Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is one of the most promising candidate materials for flexible thermoelectric generators. We report changes in morphological, electrical, and thermoelectric properties of strained PEDOT:PSS thin films treated with solvents, including H2SO4, MeOH, and polyethylene glycol (PEG). The stretching creates macroscopic cracks on the thin film surface and microscopically change the domain structure from a dense network to an isolated state. With increasing strain, short, fine cracks at small strains propagate into long, thick cracks. The H2SO4 treatment makes PEDOT:PSS very brittle even at ∼5% strain, whereas PEG improves the stretchability of PEDOT:PSS up to 50%. Stretching reduces the electrical conductivity of solvent-treated samples, which agrees well with the decreased hole concentration of strained PEDOT:PSS, as confirmed by ultraviolet photoemission spectroscopy. In contrast, the Seebeck coefficient (<I>S</I>) of the strained PEDOT:PSS thin films increases. The PEG sample shows the highest <I>S</I>, and thus exhibits an enhanced power factor (PF) with strain, while other solvent treatments reduce PF. To the best of our knowledge, this is the first report on the strain-induced enhancement of <I>S</I> and thermoelectric PF of PEDOT:PSS.</P>