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정동기,니레시사르마,김종현,오성종 사단법인 한국동물생명공학회 2014 한국동물생명공학회지 Vol.29 No.4
Phasianus colchicus is not only a beautiful bird but also a great value in science and under the threat of endanger. Hence, the aim of this study was to isolate the pheasant male germ cells (mGCs) and then induce them into elongatedsperm-like cells in vitro. The mGCs were purified and enriched by a two-step plating method based on the differentadherence velocities of mGCs and somatic cells. The percentage of the c-kit positive cells and c-kit negative cellsexamined by flow cytometry analysis (FCA) was 92.87% and 2.57%, respectively. Subsequently, the mGCs were inducedfor 48h in DMEM/F12 medium supplemented factors such as retinol acid, testosterone and bovine FSH, followed by 5weeks in culture. We found that some elongated sperm-like cells appeared initially in vitro under inducement of stimulatedfactors. The elongated sperm-like cells showed in the expression of changed morphology and post-transcriptionalmarker such as spermatid associated (SPERT), spermatid perinuclear RNA binding protein (STRBP), round spermatidbasic protein 1 (RSBN1) and SPER1L. Moreover, in DNA content identified assay, induced cells showed that the 1CDNA population markedly increased in differentiated group but it was not change in undifferentiated group. Successfulin vitro differentiation of pheasant testicular germline cells into spermatids appears to offer extremely attractive potentialfor the conservation of endangered birds and treatment of male infertility.
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잡는 어업에서 기르는 어업으로 - 양식용 배합사료 직접지불제 사업시행 -
정동기 한국단미사료협회 2005 피드저널 Vol.3 No.8
생사료 사용으로 야기되는 양식어장의 환경악화 및 자원남획을 방지하고 WTO체제하에서 경쟁력있는 양식업으로 살아 남을 수 있도록 하기위해 실시되는 배합사료 직접지불제 사업을 소개한다.
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사진시장의 급속한 디지털화와 더불어 올해 미니랩시장 최고의 활황 예상 - 미니랩 시장의 동향 및 전망
정동기 한국광학기기산업협회 2002 光學世界 Vol.14 No.1
2001년에는 저가의 보급형 미니랩이 출시되어 기존 제품의 수요가 이미 소진됐다는 것을 반증했으며, 2002년에는 보급형 기종간의 경쟁이 치열할 것으로 예상된다. 국내 아날로그를 포함한 전체 미니랩기기는 약 7천연대로 추정되며 현재까지 디지털 미니랩이 170여대로 아날로그 기기를 대체하는데 시장 확대 수요는 많은 여유가 있다고 예상된다.
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Synthesis of Deep Blue Thermal Delayed Activated Fluorescent Material Containing Triazole
정동기,박준혁,최희재,이칠원 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The molecular design of Thermally Activated Delayed Flourescence (TADF) with excellent quantum efficiency minimizes the energy difference between singlet and triplet energy states, so that the triplet state to singlet state transition (Reverse Intersystem Crossing (RISC) can easily occur, and the donor intensity and it should be designed to emit blue light in the short wavelength region by controlling the intensity of the donor and acceptor. In this study, the triazole derivatives DMACtTAZ and DPX-tTAZ were designed and synthesized with a deep blue TADF material that can be used in the light emitting layer of an organic light emitting diode (OLED) device. DMAC-tTAZ and DPX- tTAZ used DMAC and PX as electron donor units and tTAZ as electron acceptor units, respectively, to control singlet state and triplet state energy. ** This research was supported by the KDRC (Korea Display Research Consortium) support program for the development of future devices technology for display industry.
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