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Preparation and Stability of PEGDA/GO Conductive Materials by DLP 3D Printing
Men Thi Hong Nguyen,Su Yeon Kim,Tae Hyeon Jeong,Jong Hoon Kim,Hyoung Sic Cho,Tai Hwan Ha,Sang Jung Ahn,Young Heon Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.3
Stable composites of water-dispersed graphene oxide (GO) and UV-cured acrylic resin, poly (ethylene glycol) diacrylate(PEGDA), were prepared to make printed conductive patterns using a digital light processing (DLP) three-dimensional(3D) printing method. The targeted structures were successfully printed by DLP 3D printing and the electrically conductiveproperties were obtained by reducing the insulating GO in the composites to reduced GO by chemical and thermal reductionprocesses. Three basic reduction procedures, pre-thermal, pre-chemical, and post-thermal reduction, were performedto introduce a high conductivity into a printed structure and the lowest resistance was achieved by the pre-thermal reductionin our study. The stability of the printed structures was also evaluated by monitoring the change in resistance with time. Thestrategy pursued by photopolymerization gives the outstanding features of printed structures for extensive applications inthe manufacturing of electronic and sensing devices.
김태형,Tai-Qin Huang,장자준,Man Ho Kim,Hyun-Jeong Kim,Jae-Seon Lee,Jeong Ki Pack,Jeong-Sun Seo,Woong-Yang Park 생화학분자생물학회 2008 Experimental and molecular medicine Vol.40 No.3
Even though there is no direct evidence to prove the cellular and molecular changes induced by radiofrequency (RF) radiation itself, we cannot completely exclude the possibility of any biological effect of mobile phone frequency radiation. We established a carousel- type exposure chamber for 849 MHz or 1763 MHz of mobile phone RF radiation to expose RF to the heads of C57BL mice. In this chamber, animals were irradiated intermittently at 7.8 W/kg for a maximum of 12 months. During this period, the body weights of 3 groups-sham, 849 MHz RF, and 1763 MHz RF-did not show any differences between groups. The brain tissues were obtained from 3 groups at 6 months and 12 months to examine the differences in histology and cell proliferation between control and RF exposure groups, but we could not find any change upon RF radiation. Likewise, we could not find changes in the expression and distribution of NeuN and GFAP in hippocampus and cerebellum, or in cell death by TUNEL assay in RF exposure groups. From these data, we conclude that the chronic exposure to 849 MHz and 1763 MHz RF radiation at a 7.8 W/kg specific absorption rate (SAR) could not induce cellular alterations such as proliferation, death, and reactive gliosis.
서정현(Jeong Hyun Seo),한원영(Won Young Han),고종민(Jong Min Ko),백인열(In Youl Baek),이병원(Byong Won Lee),윤홍태(Hong Tai Yun),이영훈(Young Hoon Lee),신상욱(Sang Ouk Shin),오기원(Ki Won Oh),하태정(Tae Joung Ha),최만수(Man Soo Choi) 한국육종학회 2021 한국육종학회지 Vol.53 No.3
‘Cheongmiin’ is a green seed-coated soybean cultivar developed from a cross between ‘Cheongjakong’ and ‘Daemang’ in 2002. The F₁ and F₂ populations were grown for 2 years, and promising lines were selected based on the pedigree method from generations F₃ to F₅. Preliminary and advanced yield trials were conducted from 2009 to 2010, and regional yield trials (RYTs) were conducted in eightregions from 2011 to 2013. ‘Cheongmiin’ is a determinate soybean with white flowers, green cotyledons, and spherical green seeds. Theaverage flowering and maturing dates of ‘Cheongmiin’ were August 1st and October 22nd, respectively. In terms of quantitative characteristics,‘Cheongmiin’ has a larger seed size (34.3 g/100-seed weight) than that of ‘Cheongdu1ho’ (24.5 g/100-seed weight), and has also been shownto be tolerant to lodging and pod shattering in the field in RYTs and oven drying tests, respectively. Furthermore, ‘Cheongmiin’ has beenfound to be resistant to bacterial pustules in the field and soybean mosaic viruses (G5H and G6H strains) in inoculation tests. The meanyield of ‘Cheongmiin’ in the RYTs was 272 kg/10 a, which was 4% higher than that of ‘Cheongdu1ho’. Given its large seed size and seedcoat color, ‘Cheongmiin’ is expected to be highly useful for cooking with rice and for the preparation of rice cakes (Registration No. 7688).
서정현(Jeong Hyun Seo),강범규(Beom Kyu Kang),백인열(In Youl Baek),한원영(Won Young Han),최만수(Man Soo Choi),이병원(Byong Won Lee),윤홍태(Hong Tai Yun),김홍식(Hong Sik Kim),고지연(Jee Yeon Ko),김준회(Jun Hoi Kim),허수빈(Su Vin Heo),황 한국육종학회 2022 한국육종학회지 Vol.54 No.4
‘Cheongja5’ is a black seed coat soybean cultivar developed from crossing ‘Milyang181’ and ‘YS1886 (Cheongdu1/Tanbaguro)’ in 2007. Promising lines were selected using the pedigree method from F3 to F5. The preliminary and advanced yield trials were conducted in 2013 and 2014, respectively. Regional yield trials (RYT) were conducted in seven regions from 2015 to 2017. ‘Cheongja5’ has a determinate growth habit, oval leaflet shape, brown pubescence, and white flowers. The seed of ‘Cheongja5’ has a black seed coat color with green cotyledon. Flowering and maturing dates were Aug. 3 and Oct. 24, respectively. Regarding the quantitative characteristics, ‘Cheongja5’ has large seed size (37.0 g/100-seed weight) and more pods than ‘Cheongja3’. ‘Cheongja5’ was tolerant to pod shattering in field and indoor RYT tests. ‘Cheongja5’ was resistant to bacterial pustule in the field and soybean mosaic virus (strains G6H and G7H) in the inoculation test. Although its seed quality-related characteristics were almost similar to those of ‘Cheongja3’, it contained more anthocyanin which is a main functional component of black soybean. The mean yield of ‘Cheongja5’ in the RYTs was 343 kg/10 a which was 30% higher than that of ‘Cheongja3’. ‘Cheongja5’ is expected to be widely cultivated as a material for making soy-food that uses black soybean because of its large seed size and high yield potential (Registration No. 7687).
정기태(Gi-Tai Jung),류정(Jeong Ryu),주인옥(In-Ok Ju),노재종(Jae-Jong Noh),김정만(Jeong-Man Kim) 한국식품영양과학회 2014 한국식품영양과학회지 Vol.43 No.2
본 연구는 여러 가지 기능성을 갖는 대나무추출액을 첨가한 약주를 개발하기 위하여 대나무 알코올추출액을 사용하였으며 풍미를 향상시키기 위하여 생강과 배를 첨가하여 약주를 제조한 후 품질특성과 관능검사를 실시하였고 이들의 항산화 활성과 아질산염 소거능 등 기능성을 조사하였다. 대나무 알코올추출액 첨가한 약주의 pH는 대조구에 비하여 낮았으나 총산과 당도는 높았다. 알코올 함량은 대조구에 비하여 대나무 알코올추출액을 첨가한 약주가 약간 높았다. 색도인 L값은 대나무 알코올추출액을 첨가한 약주가 대조구에 비해 낮았고 b값과 갈변도는 높았다. 약주의 성분 중 유기산은 citric acid, malic acid, succinic acid, lactic acid, acetic acid 등이 검출되었으며 모든 처리구에서 lactic acid가 가장 많이 함유되어 있고 유리당은 sorbitol, glucose 및 fructose가 검출되었고 glucose 함량이 가장 높았다. 총 폴리페놀 함량은 대조구가 약간 높았다. 항산화 활성은 대나무 알코올추출액을 첨가하지 않은 대조구가 5.8%로 가장 낮았으나 대나무 알코올추출액을 첨가한 약주에서는 23.8~31.0%로 높게 나타났다. 아질산염 소거능은 pH 1.2와 3.0에서는 모든 처리가 97.5% 이상의 활성을 보인 반면 pH 6.0에서는 대나무추출액을 첨가하여 발효한 약주에서 15.2~36.4%의 활성을 나타내었다. 관능평가 결과 대나무 알코올추출액+생강, 대나무 알코올추출액+생강+배 첨가 약주가 향, 맛 및 전반적인 기호도에 있어서 유의적으로 높았다. This study was carried out to develop Yakju, a new kind of Korean traditional rice wine added with bamboo ethanol extract and characterized by containing various health benefits. The wine with bamboo ethanol extract was fermented by adding ginger and pear to improve flavor and quality. Several quality characteristics and physiological functionalities of Yakju were investigated. When bamboo ethanol extract was added to Yakju, the pH level decreased compared to that of the control. However, total acidity and soluble solid levels were higher than those of the control. The alcohol content of Yakju added with bamboo ethanol extract was slightly higher than that of the control. In examining the colors of Yakju containing bamboo ethanol extract, L value was lower than that of the control, whereas b value and brownness were higher. Various organic acids such as citric acid, malic acid, succinic acid, lactic acid, and acetic acid were determined, and the main organic acid among them was lactic acid. Various free sugars such as sorbitol, glucose, and fructose were detected and glucose was the most abundant. Total polyphenol content of Yakju added with bamboo ethanol extract was lower than that of the control. Further, electron-donating ability ranged from 23.8~40.0%, which was higher than that of the control. Nitrite scavenging ability of Yakju added with bamboo ethanol extract ranged from 15.2~36.4%, which was higher than that of the control at pH 6.0. Sensory evaluation of Yakju showed that bamboo ethanol extract+ginger as well as bamboo ethanol extract+ginger+pear treatment significantly increased flavor, taste, and overall acceptance compared to the others.
( Kwang Ho Jeong ),( Man Soo Choi ),( Seuk Ki Lee ),( Min Jung Seo ),( Tae Young Hwang ),( Hong Tai Yun ),( Hong Sig Kim ),( Jung Tae Kim ),( Young Up Kwon ),( Yul Ho Kim ) 한국육종학회 2013 Plant Breeding and Biotechnology Vol.1 No.3
An increasing production of soybean (Glycine max [L.] Merr.)-based food products may limit dietary choices for soy-allergic individuals. Gly m Bd 30K (P34) is the main seed allergen causing implications in soybean-sensitive patients. The objective of this research was to develop low allergenic soybean lines with molecular marker. The soybean genome assembly specifies that three copy genes of P34 exist in soybean genome. These are Glyma08g12270, which is expressed at significantly higher level over the other two, Glyma08g12280 and Glyma05g29130. Glyma08g12270 was found inactive and was not expressed in low P34 germplasm accessions. Using a co-dominant marker and a polyclonal antibody, polymorphisms and the quantity of protein produced by Glyma08g12270 were analyzed in the F2 and F3 generations obtained by crossing PI567476 and the Korean cultivar Hwanggum. The molecular marker and polyclonal antibody developed in this study could therefore be effectively used for selecting lines that express P34 at low levels. Selected lines could further be used to cross with other null allergenic soybean accessions to breed low allergenic soybean variety.