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김대성,최근원,정인식,이승우 경희대학교식량자원개발연구소 2005 硏究論文集 Vol.24 No.-
본 실험은 치커리 'Radicchio'(Cichorium intybus L.)에서 Agrobacterium을 이용한 형질전환에 영향을 주는 요인들을 적정화하기 위하여 실시되었다. 치커리 'Radicchio'의 자엽절편체를 이용한 kanamycin과 cefotaxime 항생제 감응성 검정 결과 20 mg·L^(-1) 이상의 kanamycin 농도가 형질전환 신초의 선발에 적당하고 200 mg·L^(-1)의 cefotaxime 농도가 절편체 생장에 부정적인 영향을 주지 않으며 배지 내 Agrobacteria를 제거하기에 적절함을 나타내었다. Terpene cyclase 유전자가 재조합된 PILTAB 벡터를 갖는 Agrobacterium tumefaciens LBA4404와의 효과적인 공동배양 기간은 3일간으로 결정되었다. IAA 1.0 mg·L^(-1), BAP 1.0 mg·L^(-1), kanamycin 20 mg·L^(-1) 그리고 cefotaxime 200 mg·L^(-1)를 함유한 선발배지에서 형질전환 된 것으로 여겨지는 신초들이 생산되어 발근을 위해 kanamycin 40 mg·L^(-1)와 cefotaxime 200 mg·L^(-1)이 첨가된 1/2MS 발근배지에 옮겨져 87%의 발근율을 보였다. 발근된 형질전환체들을 대상으로 terpene cyclase 유전자특이 primer를 이용한 PCR 분석이 실시되어 재분화 치커리 내로 1.64 kb 크기의 terpene cyclase 유전자의 성공적인 도입을 확인하였다. This experiment was initiated to optimize factors affecting Agrobacterium-mediated transformation in Cichorium intybus L. cv. Radicchio. The results from the antibiotic sensitivity test for kanamycin and cefotaxime using cotyledon explants of chicory 'Radicchio' suggested that the concentration of kanamycin above 20 mg·L^(-1) might be an appropriate level to make a selection on transgenic shoots possible and 200 mg·L^(-1) of cefotaxime also could be a proper concentration to remove Agrobacteria from the media without any negative effect on explants. The efficient duration for co-cultivation of cotyledon explants with Agrobacterium tumefaciens LBA4404 harboring the recombinant binary vector PILTAB carrying 1.64 kb terpene cyclase gene was decided as 3 days. Putative transgenic shoots were produced on the selection media containing 1.0 mg·L^(-1) IAA, 1.0 mg·L^(-1) BAP, 20 mg·L^(-1) kanamycin, and 200 mg·L^(-1) cefotaxime and transferred to 1/2MS media supplemented with 40 mg·L^(-1) kanamycin and 200 mg·L^(-1) cefotaxime for rooting. The rooting ratio was 63% and putative transgenic plants with roots were obtained. Results from PCR analysis with terpene cyclase gene specific primers confirmed a successful insertion of 1.64 kb terpene cyclase gene into the genomic DNA of the regenerated chicory.
국내육성 오차드그라스 품종들의 캘러스 형성율 및 식물체 재분화 효율
김기용,강경민,배은경,이인애,임용우,최기준,박근제,손대영,조진기 Plant molecular biology and biotechnology research 2003 Plant molecular biology and biotechnology research Vol.2003 No.-
Comparisons of callus formation ratios from seed explants, callus sizes, regeneration ratios from callus and regeneration efficiency for 4 orchardgrass (Dactylis glomerata L.) varieties (Three were developed in Korea and one was imported from foreign nation) are as follows; Jangbeol 102 (67.0%) has the highest callus formation ratio in 4 weeks incubated callus after bedding the seed explants, but Potomac (68.4%) has the highest ratio in 6-seek callus. Potomac (3.93cm) has the highest callus size in 4-week callus, but Jangbeol 101 (4.32cm) has the highest size in 6-week callus. Jangbeol 101 (17.7%) has the highest plant regeneration ratio in 4-week callus, but Potomac (37.4%) has the highest raion in 6-week callus. Jangbeol 102 (11.5%) has the highest plant regeneration efficiency in 4-week callus, but Potomac (25.6%) has the highest efficiency in 6-week callus.
The Glycopeptide, a Promoter of Thymidine Uptake, from Aloe Vera
Choi, Hong Dae,Yang, Mi-Rim,Kang, Chun Geun,Roh, Yeon Suk,Son, Byeng Wha,Park, Young In,Lee, Seung Ki,Choi, Sung Won,Chung, Myung Hee 동의대학교 기초과학연구소 1999 基礎科學硏究論文集 Vol.9 No.1
As a part of search for new biologically active constituents from aloe, we have isolated a glycopeptide, called G1G1M1DI2, from the gel(G1) of Aloe vera. Chemical and spectroscopic evidence indicated that G1G1M1DI2 is a glycopeptide. The molecular weight of G1G1M1DI2 was about 5,500 daltons, and the carbohydrate and protein contents were 20.9% and 32.6%, respectively. Periodate oxidation and enzymic degradation gave peptide moiety and carbohydrate moiety, respectively. Carbohydrate moiety is composed of fucose, galactose, glucose and mannose in a molar ratio of 0.5:2.4:48.8:48.3. Peptide moiety is composed of fifteen amino acids, and glutamic acid and glycine were the major componants. The glycopeptide, G1G1M1DI2, stimulated thymidine uptake of SCC 13 cells about 6.5 times the control. This result suggests that this glycopeptide has a skin cell proliferating activity.
Nanotransfer Molding of Free-Standing Nanowire and Porous Nanomembranes Suspended on Microtrenches
Choi, Dae-Geun,Lee, Ki-Joong,Kim, Jung Yup American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.2
<P>Direct transfer printing of functional materials has been employed in the development of sensors, displays, and energy-harvesting devices. The transfer process can be applied advantageously to depositions onto nonplanar and flexible surfaces at low temperatures. In this work, we fabricated free-standing nanowire arrays and nanomembranes on micrometer-scale trenches by nanotransfer molding. We also investigated how deposition pattern types vary with trench dimensions as well as processing pressure and temperature. Finally, a free-standing polymer membrane fabricated by nanotransfer molding was employed as a novel mask in the preparation of three-dimensional nanodot arrays.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-2/am302493x/production/images/medium/am-2012-02493x_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302493x'>ACS Electronic Supporting Info</A></P>
Choi, Yoon Jin,Lee, Dong Ho,Choi, Myung-Gyu,Lee, Sung Joon,Kim, Sung Kook,Song, Geun Am,Rhee, Poong-Lyul,Jung, Hwoon-Yong,Kang, Dae-Hwan,Lee, Yong Chan,Lee, Si Hyung,Choi, Suck Chei,Shim, Ki-Nam,Seol, KOREAN ACADEMY OF MEDICAL SCIENCE 2017 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.32 No.11
<P>This study compared the efficacy of DA-9601 (Dong-A ST Co., Seoul, Korea) and its new formulation, DA-5204 (Dong-A ST Co.), for treating erosive gastritis. This phase III, randomized, multicenter, double-blind, non-inferiority trial randomly assigned 434 patients with endoscopically proven gastric mucosal erosions into two groups: DA-9601 3 times daily or DA-5,204 twice daily for 2 weeks. The final analysis included 421 patients (DA-5204, 209; DA-9601, 212). The primary endpoint (rate of effective gastric erosion healing) and secondary endpoints (cure rate of endoscopic erosion and gastrointestinal [GI] symptom relief) were assessed using endoscopy after the treatment. Drug-related adverse events (AEs), including GI symptoms, were also compared. At week 2, gastric healing rates with DA-5204 and DA-9601 were 42.1% (88/209) and 42.5% (90/212), respectively. The difference between the groups was −0.4% (95% confidence interval, −9.8% to 9.1%), which was above the non-inferiority margin of −14%. The cure rate of gastric erosion in both groups was 37.3%. The improvement rates of GI symptoms with DA-5204 and DA-9601 were 40.4% and 40.8%, respectively. There were no statistically significant differences between the two groups in both secondary endpoints. AEs were reported in 18 (8.4%) patients in the DA-5204 group and 19 (8.8%) in the DA-9601 group. Rates of AE were not different between the two groups. No serious AE or adverse drug reaction (ADR) occurred. These results demonstrate the non-inferiority of DA-5204 compared to DA-9601. DA-5204 is as effective as DA-9601 in the treatment of erosive gastritis. Registered randomized clinical trial at ClinicalTrials.gov (NCT02282670)</P>
미세접촉인쇄기법을 이용한 다기능성 자기조립막 제작과 전자ㆍ생물소자로의 응용
최대근(Dae-Geun Choi),유형균(Seung-Man Yang),양승만(Hyung Kyun Yu),조정대(Jeongdai Jo),이응숙(Eungsug Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this work, we fabricated various 2D metallic and polymeric nanopatterns with the feature resolution of<br/> sub-micrometer scale by using the method of microcontact printing ( CP) based on soft lithography. Silicon<br/> masters for the micromolding were made by e-beam lithography. Composite poly(dimethylsiloxane) (PDMS)<br/> molds were composed of a thin, hard layer supported by soft PDMS layer. Finally, monodisperse metal or<br/> polymer particles could be obtained in the prepared pattern for the application of electronic devices.
Mass fabrication of resistive random access crossbar arrays by step and flash imprint lithography
Yun, Dae Keun,Kim, Ki-Don,Kim, Sungho,Lee, Ji-Hye,Park, Hyeong-Ho,Jeong, Jun-Ho,Choi, Yang-Kyu,Choi, Dae-Geun IOP Pub 2009 Nanotechnology Vol.20 No.44
<P>Step and flash imprint lithography (SFIL) is a promising method recently used for next generation lithographic technology because it is a high-speed process that can be carried out at room temperature and low pressures. Improvements made to SFIL enable the replication of crossbar patterns with a high resolution and the development of suitable materials and techniques to achieve high resolution capability. In this study, SFIL is used to fabricate high-density random access crossbar arrays based on a NiO resistive switching system. The bottom and top electrodes are transferred onto silicon wafers perpendicular to each electrode using the inductively coupled plasma reactive ion etching (ICP-RIE) technique. Direct metal etching without a wet-based process minimizes damage to the electrode surface. The <I>I–V</I> curves of individual active cells (70 × 70 nm<SUP>2</SUP>) for crossbar arrays reveal the unipolar resistive switching (RS) behaviour of the fabricated device. A high off/on resistance ratio (>10<SUP>4</SUP>) and reproducible resistance switching characteristics for each active cell were found in different fields and for different wafers. The experimental data indicate that high-density crossbar arrays can be well replicated and that the electrical performance of these arrays is reliable. </P>