• Title/Summary/Keyword: National R&D Report

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생약석곡(Dendrobii herba)의 생리활성 성분 규명 (Phytochemical Identification of Bioactive Constituents of Dendrobii herba)

  • 남보미
    • 한국자원식물학회:학술대회논문집
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    • 한국자원식물학회 2023년도 임시총회 및 춘계학술대회
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    • pp.18-18
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    • 2023
  • Two new phenanthrenes, namely, (1R,2R)-1,7-hydroxy-2,8-methoxy-2,3-dihydrophenanthrene-4(1H)-one (1) and 2,7-dihydroxyphenanthrene-1,4-dione (2), were isolated from the ethyl acetate-soluble fraction of Dendrobii Herba, together with the eleven known compounds, densiflorol B (3), 6,7-dimethoxyphenanthrene2,5-diol (4), dehydroorchinol (5), 1,5,7-trimethoxy-2-phenanthrenol (6), denthyrsinin (7), ephemerantol A (8), lusianthridin (9), moscatilin (10), gigantol (11), 3-[(1E)-2-(3-hydroxyphenyl)ethenyl]-5-methoxyphenol (12) and (-)-syringaresinol (13). Structures of 1 and 2 were elucidated by analyzing 1D and 2D NMR as well as HR-ESI-MS data. The absolute configuration of compound 1 was confirmed by ECD spectroscopic method. In cytotoxicity evaluation using FaDu human hypopharyngeal squamous carcinoma cell line, compounds 3-6, 8, 10 and 12 showed activities, with IC50 values ranging from 2.55 to 17.70 μM. Among them, compound 10 exhibited remarkable cytotoxic activity with IC50 value of 2.55 μM. This is the first report on the anticancer mechanistic study of compound 10 in HNSCC including FaDu cells.

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PAGAN II: THE EVOLUTION OF AGN JETS ON SUB-PARSEC SCALES

  • OH, JUNGHWAN;TRIPPE, SASCHA;KANG, SINCHEOL;KIM, JAE-YOUNG;PARK, JONG-HO;LEE, TAESEOK;KIM, DAEWON;KINO, MOTOKI;LEE, SANG-SUNG;SOHN, BONG WON
    • 천문학회지
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    • 제48권5호
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    • pp.299-311
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    • 2015
  • We report first results from KVN and VERA Array (KaVA) VLBI observations obtained in the frame of our Plasma-physics of Active Galactic Nuclei (PAGaN) project. We observed eight selected AGN at 22 and 43 GHz in single polarization (LCP) between March 2014 and April 2015. Each source was observed for 6 to 8 hours per observing run to maximize the uv coverage. We obtained a total of 15 deep high-resolution images permitting the identification of individual circular Gaussian jet components and three spectral index maps of BL Lac, 3C 111 and 3C 345 from simultaneous dual-frequency observations. The spectral index maps show trends in agreement with general expectations – flat core and steep jets – while the actual value of the spectral index for jets shows indications for a dependence on AGN type. We analyzed the kinematics of jet components of BL Lac and 3C 111, detecting superluminal proper motions with maximum apparent speeds of about 5c. This constrains the lower limits of the intrinsic component velocities to ~ 0.98c and the upper limits of the angle between jet and line of sight to ~20°. In agreement with global jet expansion, jet components show systematically larger diameters d at larger core distances r, following the global relation d ≈ 0.2r, albeit within substantial scatter.

Address discharge delay reduction in AC PDP by applying MgO nanoparticle under protective layer

  • Seo, Ki-Ho;Shin, Seung-Ha;Choi, Man-Soo;Whang, Ki-Woong
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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    • pp.355-358
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    • 2008
  • We report a method for improving characteristics of AC PDP in this study. This improvement is obtained by spreading MgO nanoparticles on transparent dielectric layer. These nanoparticles are covered with MgO protective layer by electron beam evaporation. MgO nanoparticle has difference in cathodoluminescence stronger than MgO layer by electron beam evaporation. This method worked for reducing statistical delay especially. Efficacy, discharge voltage and luminance were also improved But these improvements has limited lifetime because continuous ion bombardments changed characteristic of MgO surface.

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Carbon Nanotube Passivation layer for Increasing the Solar Water Splitting Performance of CdS/CuInGaSe Photocathode

  • Bae, Hyojung;Ko, Young-Hee;Park, Jun-Beom;Ko, Hang-Ju;Ryu, Sang-Wan;Ha, Jun-Seok
    • 마이크로전자및패키징학회지
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    • 제26권4호
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    • pp.107-111
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    • 2019
  • We report the fabrication of a CdS/CuInGaSe (CdS/CIGS) structure with carbon nanotubes and its application as a photocathode for photoelectrochemical water splitting. CIGS thin films were fabricated using co-evaporation by RF magnetron sputtering, while CdS was fabricated by chemical bath deposition. Spray coated multi-wall carbon nanotube (CNT) film on CdS/CIGS thin film was investigated as a photocathode. The CNT-coated CdS/CIGS showed superior photocurrent density and exhibited improved photostability.

Rhizobium meliloti TAL1372에서 섬유소분해효소 유전자 클로닝 (Clonig of CM-cellulase Gene of Rhizobium meliloti TAL1372 in Escherichia coli)

  • 박용우;임선택;강규영;윤한대
    • Applied Biological Chemistry
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    • 제38권4호
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    • pp.313-319
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    • 1995
  • 본 실험은 알팔파(Medicago sativa) 근류균인 Rhizobium meliloti TAL1372 균주에서 섬유소분해효소의 활성을 확인하고 이 유전자를 크로닝하기 위해 코스미드 벡타인 pLAFR3를 사용하여 유전자 은행을 만들었다. 이 유전자 은행으로 부터 분리한 1,000개의 형질 도입체에서 CM-cellulase(carboxymethylcellulase) 활성이 있는 클론(pRC8-71) 하나를 분리하였으며 30kb 크기의 R. meliloti DNA 단편을 함유하고 있는 것을 확인하였다. 이 CM-cellulase 유전자의 발현 산물을 native PAGE 법에 의하여 분자량을 측정한 결과 약 45kD 정도의 크기로 추정되었으며 pRC8-71로 부터 Tn5 변이법에 의해 조사한 결과 30kb 단편 내에서 CM-cellulase 유전자의 위치는 제한효소 KpnI에 의해 절단되는 약 3kb 단편에 존재하였다. 표시교환 변이법에 의해 야생균주 R. meliloti TAL1372로부터 cellulase 무생산 변이체를 얻어 근류형성 정도를 실험한 결과 CM-cellulase유전자가 근류형성에 관련될 것으로 추정되었다.

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신규 채소작물용 번행초의 토성 및 염도에 대한 생육 반응 (Growth responses of New Zealand Spinach [Tetragonia tetragonoides (Pall.) Kuntze] to different soil texture and salinity)

  • 김성기;김인경;이긍주
    • 농업과학연구
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    • 제38권4호
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    • pp.631-639
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    • 2011
  • This research was conducted to investigate potential use of New Zealand spinach (Tetragonia tetragonoides) as a new vegetable crop which will be cultivating in salt-affected soils including reclaimed land. Traditionally New Zealand spinach has been studied to explore functional compound or salt removing potential. To cultivate the crop species in the salt-affected soil widely, it is essential to obtain salt and soil texture responses under the controlled environment. Fifty nine New Zealand spinach ecotypes native to Korean peninsula first collected over seashore areas, and primitive habitat soil environment was evaluated by analyzing soil chemical properties from 32 locations. Different textures of sandy, silt loam, and sandy loam soils were prepared from nearby sources of sea shore, upland and paddy soils, respectively. Target salinity levels of 16.0 dS/m, 27.5 dS/m, 39.9 dS/m, and 52.4 dS/m in electrical conductivity (ECw) were achieved by diluting of 25, 50, 75, 100% (v/v) sea water to tap water (control, 0.6 dS/m), respectively. Various measurements responding to soil texture and irrigation salinity included plant height, root length, fresh weight (FW), dry weight (DW), leaf parameters (leaf number, leaf length, leaf width), lateral branching, and inorganic ion content. was found to adapt to diverse habitats ranging various soil chemical properties including soil pH, organic matter, exchangeable bases, EC, and cation exchange capacity (CEC) in Korea. Responding to soil texture, New Zealand spinach grew better in silt loam and sandy loam soil than in sandy soil. Higher yield (FW and DW) seemed to be associated with branch number (r=0.99 and 0.99, respectively), followed by plant height (r=0.94 and 0.97, respectively) and leaf number (r=0.89 and 0.84, respectively). Plant height, FW, and DW of the New Zealand spinach accessions were decreased with increasing irrigation salinity, while root length was not significantly different compared to control. Based on previous report, more narrow spectrum of salinity range (up to 16 dS/m) needs to be further studied in order to obtain more accurate salinity responses of the plant. As expected, leaf Na content was increased significantly with increasing salinity, while K and Ca contents decreased. Growth responses to soil texture and irrigation salinity implied the potential use of New Zealand spinach as a leafy vegetable in salt-affected soil constructed with silt loam or sandy loam soils.

Identification and Cloning of a Fraction 1 Protein of Yersinia pestis that Produces Protective Immune Responses

  • Kim Jong-Hyun;Cho Seung-Hak;Jang Hyun-Chul;Lee Hee-Cheul;Kim Young-Il;Kang Yeon-Ho;Lee Bok-Kwon
    • Journal of Microbiology and Biotechnology
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    • 제16권8호
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    • pp.1180-1184
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    • 2006
  • The capsule that surrounds Yersinia pestis cells is composed of a protein-polysacchride complex; the purified protein component is fraction I (F1) antigen. We report the cloning of the cafl gene and its expression in Escherichia coli using the vector pETl02/D-TOPO and the F1-specific monoclonal antibody. The recombinant F1 (rF1) antigen had a molecular size of 17.5 kDa, which was identical to that of the F1 antigen produced by Y. pestis. Recombinant F1 protein was found to react to polyclonal antiserum to Y. pestis Fl. Recombinant F1 was purified by ProBond purification system and induced a protective immune response in BALB/c mice challenged with up to 10$^5$ virulent Y. pestis. Purified rF1 protein was used in an ELISA to evaluate the ability of a method to detect antibodies to Y. pestis in animal sera. These results strongly indicated that the rF1 protein is a suitable species-specific immunodiagnostic antigen and vaccine candidate.

운항선 중심의 선박 경제운항 관리의 기술적 분석 (Technical Analysis on Existing Ship's Economical Operation)

  • 강남선;김용대;윤현규;변상수
    • 한국항행학회논문지
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    • 제20권6호
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    • pp.519-527
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    • 2016
  • 본 논문에서는 해운선사의 운영비용 관리를 위해서 현존선의 항차 단위의 선박 경제운항 기술을 위한 개념 연구를 수행하였다. 해운산업 현황과 경제운항 기술개발 현황, 기술 요구사항 및 선박 운영에 필요한 비용 요소를 분석하여 경제운항 관리요소를 도출하였다. 개별 항차를 기준으로 현존선의 경제운항은 연료비와 항만에서 사용되는 비용을 최소화 하는 것이며, 이를 위해서 저속운항, 정속운항, 배수량 관리, 최적 트림, 최적 항로 선정, 터미널 생산성 관리, 선박 에너지 절감 활동을 관리한다. 최적항로, 터미널 생산성 관리는 절감된 시간으로, 저속운항, 정속운항, 최적트림, 선박 에너지 절감은 권고사항 만족 여부를 관리한다.

금선련 조직 배양체 추출물의 멜라닌 합성 및 지방축적 억제 효과 (Inhibitory Effect of Jewel Orchid (Anoectochilus Formosanus) Plantlet Extract against Melanogenesis and Lipid Droplet Accumulation)

  • 박창민;정민석;백기엽;최종완
    • 대한화장품학회지
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    • 제36권2호
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    • pp.145-150
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    • 2010
  • 일반적으로 보석란으로 알려진 금선련은 대만에서 폐나 간의 질병 및 발열이나 두통 치료를 위한 전통식물약제로 사용되어 왔다. 본 연구에서는 생물반응장치를 이용하여 조직배양된 금선련 식물체에 대하여 화장품 성분으로써 응용 가치를 평가하였다. 이미 몇몇 보고 된 논문에서 금선련은 항암활성, 면역 활성, 간 보호 활성 및 지질대사의 약리학적 활성 등에 대한 연구가 되고 있지만 화장품 성분으로 효능들에 대한 연구는 알려져 있지 않다. 따라서 본 연구에서는 생물반응장치를 이용하여 조직배양된 금선련 추출물에 대하여 미백 및 항비만 관련한 효능 효과를 평가하였다. 실험 결과 조직배양된 금선련 추출물은 tyrosinase 활성 및 멜라닌 합성 억제 효과뿐만 아니라 지방 전구 세포의 지방세포로의 분화를 억제시킴으로써 세포 내 지질 축적을 억제하였다. 이러한 결과들은 피부보호를 위한 화장품 성분으로서 응용 가능성을 제공 할 수 있을 것으로 사료된다.

사업기획단계에서의 현수교의 물량추정을 위한 모델연구 (Estimation Model for Approximate Construction Quantities of Suspension Bridge in Early Stage)

  • 박원태;천경식
    • 복합신소재구조학회 논문집
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    • 제6권4호
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    • pp.24-29
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    • 2015
  • Bridge construction cost estimates have generally been conducted by using historial unit-price(per meter or square meter). The traditional estimating method based on unit-price references can never completely reflect the specialty of cable supported bridge. In this paper, we have developed the system for supporting the approximate construction cost and the quantity estimation based on 3D model information in the pre-project planning phase of 3-span continuous suspension bridge with 2-pylons. First of all, we'd analyzed the design information (such as structural design report, blueprint and quantity) and the real cost data from the existing suspension bridges and derived the design variables of the bridges. We developed the BIM wizard that generates a suspension bridge model parametrically based on derived design variables. The principle material quantities of suspension bridge are calculated directly from 3-dimensional bridge model built by using the BIM wizard. We have established the system that the construction cost can be estimated more specific than the traditional estimating method.