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택사 수량과 품질 향상을 위한 적정 수확시기와 건조 온도
현규환,권병선,임준택,신동영,신종섭,Hyun, Kyu-Hwan,Kwon, Byung-Sun,Lim, June-Taeg,Shin, Dong-Young,Shin, Jong-Sup 한국작물학회 2006 Korean journal of crop science Vol.51 No.suppl1
The characteristics associated with the Alisma plantago quality and the factors as the proper harvesting time and drying temperature of Alisma plantago were examined from 2004 to 2006 at Sunchon, Southern region. The Alisma plantago cultivars tested were Sunwol and Yongjun. The highest yields of root and good quality, color and luster were obtained when harvested 22 days after first frost date and dried with $35-40^{\circ}C$ of a weeks at the drying oven for Sunwol and Yongjin cultivars. Considering from our results, optimum harvesting time were most likely to be harvesting time of 22 days after first frost date and drying temperature of $35-40^{\circ}C$ of a weeks at the drying oven. 남부지역에서 고품질의 택사를 생산하기 위하여 적정 수확시기와 적정 건조온도를 검토하기 위하여 2004년부터 2006년까지 택사 선월종과 용전종을 공시하여 실험을 수행하였는데 그 결과를 요약하면 다음과 같다. 1. 첫 서리(초상) 후 22일 만인 12월 29일에 수확함으로서 선월종과 용전종이 수량성이 가장 높았고 품질에서도 회전식 박피기에서 박피한 결과 완전한 백색의 택사로 광택이 뚜렷하여 우수하였다. 2. 택사 수확 후 건조기 내에서 1주야로 7일간 $35-40^{\circ}C$ 건조할 때에 알맹이 택사(껍질이 벗겨진 박피된 택사)의 수량성이 가장 높았고 품질에서도 완전한 백색의 택사로 광택이 뚜렷하여 우수하였다. 따라서 택사의 품질 향상을 위해서는 첫 서리(초상)후 29일에 수확하고 건조는 $35-40^{\circ}C$ 건조기 내에서 1주일 건조함이 타당하리라고 생각된다.
Anthracene dicarboxyl acid 가교제를 활용한 효소연료전지의 산화극의 포도당 산화반응 향상
현규환 ( Kyuhwan Hyun ),지정연 ( Jungyeon Ji ),권용재 ( Yongchai Kwon ) 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.1
본 연구에서는 효소연료전지의 율속 반응인 산화극의 효소반응 강화 및 효소 담지량을 증가시키기 위하여 안트라센가교제를 도입하였다. CNT/PEI 담지체에 가교 처리된 글루코오스 산화효소(GOx)를 전기적인 극성을 이용하여 결합시켰다(AC[CNT/PEI/GOx]). 본 촉매의 성능을 확인하기 위하여 전기화학 평가가 수행되었으며, 성능 비교를 위해 가교제처리를 하지 않은 CNT/PEI/GOx 촉매도 같이 전기화학 테스트를 진행하였다. 전기화학적 특성 평가들을 통해 글루코오스 산화효소 담지량이 증가한 것을 확인하였으며, 라인위버-버크 방정식 통해 AC[CNT/PEI/GOx] (Km : 0.73 mM)가 가교제 처리를 하지 않은 CNT/PEI/GOx (Km : 1.71 mM) 보다 우수한 성능을 지닌 것을 확인했다. 또한, 완전지 성능 평가 결과 최대 전력 밀도(Maximum power density, MPD)도 상승(21.2 μW/cm<sup>2</sup>에서 72.6 μW/cm<sup>2</sup>로)한 것을 볼 수 있었는데 이를 통해 글루코오스 산화효소 담지량 및 전자전달능력이 향상되었다는 것을 재확인 하였다. In this study, an anthracene cross-linker is introduced to enhance the catalytic activity of glucose oxidase (GOx) based catalysts and to increase the amount of enzyme loading. The crosslinked GOx is bonded with the CNT/PEI support using the electrostatic interaction (AC[CNT/PEI/GOx]). Electrochemical evaluations are done to evaluate the performance of this catalyst and the performance of CNT/PEI/GOx catalyst is also measured as a control. According to the measurements, it is confirmed that the amount of loaded GOx increases, while K<sub>m</sub> value calculated by Lineweaver-Burk plot shows that AC[CNT/PEI/GOx] (K<sub>m</sub> : 0.73 mM) is superior to CNT/PEI/GOx (K<sub>m</sub> : 1.71 mM) without cross-linking reaction. Based on these effects, it is demonstrated that the maximum power density of the enzymatic biofuel cell using AC[CNT/PEI/GOx] increases from 21.2 μW/ ㎠ to 57.4 μW/ ㎠.
호박잎에서 Paraquat 활성 억제 물질의 분리, 동정 및 특성 구명
현규환(Kyu Hwan Hyun),윤영범(Young Beom Yun),장세지(Se Ji Jang),신동영(Dong Young Shin),권오도(Oh Do Kwon),최현석(Hyun-Sug Choi),정하일(Ha-Il Jung),국용인(Yong In Kuk) 韓國雜草學會 2012 Weed&Turfgrass Science Vol.32 No.3
선행연구를 통해 18종의 호박 품종에 대한 엽위별 paraquat에 대한 내성 반응을 조사한 결과, 1엽<2엽<3엽 The fourth leaves (younger leaves) amongst extended 4-upper leaves in 18 squash cultivar were the highest tolerance to the paraquat application, followed by third, the second, and the first leaves (older leaves). The forth leaves in Joongangaehobak showed more than three times higher tolerance to the paraquat application than did the first leaves. When the combining of water extract from the fourth leaves with paraquat were applied to the leaves and stems of maize, the paraquat phytotoxicity in maize was reduced compared to the paraquat application alone. Therefore, this study continued to investigate if the phytotoxicity inhibitor exist in the fourth leaves. The water extract in the fourth leaves were isolated by silica gel column chromatography, Sephadex LH-20 column chromatography, TLC, and HPLC, and the substance in the extract was speculated as a malic acid by identifying through NMR. The mixture malic acid and paraquat were applied to the maize to verify the application effect of malic acid on paraquat toxicity. The 100μM of paraquat application alone showed 62% of paraquat toxicity to the corn leaves, while the combined application of 100μM paraquat with malic acid at 0.1, 0.3, 0.5, and 1.0% did not show the symptom.
잠두(Vicia faba L)가 생산하는 Brassinisteroid 활성물질
박근형,현규환,Park, Keun-Hyung,Hyun, Kyu-Hawn 한국응용생명화학회 1987 한국농화학회지 Vol.30 No.1
미숙잠두 종자의 추출물을 silica gel chromatography, Sephadex LH-20 chromatography, TLC, 역, 순상의 HPLC 등에 의해 분획정제하여 BR 활성물질을 한국산 벼를 이용한 생물검정법에 의해 검색한 결과, 2종의 BR의 존재가 인정되었으며, BR 보다 분자량과 극성이 작은 물질의 존재가 시사되었다. Occurrence of two type brassinosteroid-like substances and less molecular weight substance than brassinosteroid were suggested in immature Vicia faba seeds extracts, which were purified using various chromatographic techniques, by Korean rice-lamina inclination test.
임준택,권병선,정동수,계봉명,현규환,신동영,Lim, June-Taeg,Kwon, Byung-Sun,Jung, Dong-Soo,Kae, Bong-Myung,Hyun, Kyu-Hwan,Shin, Dong-Young 한국작물학회 2006 Korean journal of crop science Vol.51 No.suppl1
This study was conducted to select the most suitable dye bath soil of mat rush for good quality. Dry stem weight ranged from 102.5 to 107.0 g, dry stem ratio ranged from 34 to 36%, color of stem ranged from soft gray to heavy gray, degree of softness ranged from high to low and degree of floating ranged from extremely high to low. All the good quality components, such as dry stem weight, dry stem ratio, color of stem, degree of softness and degree of floating showed large variations. Hadong white ceramic soil, the superior dye bath soil of mat rush, showed relatively superior values for all the good quality components with 102.5 g in light dry stem weight, 34% in high dry stem ratio, good color of soft gray in color stem, high in degree of softness and extremely high id degree of floating. The results indicate that dye bath soils shows different adaptabilities to a particular dye bath and Hadong white ceramic soil seems to be the most suitable dye bath soil of mat rush for good quality.