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The Current Status and Breeding Perspective of Major Vegetable Crops in Sri Lanka
M.J.M.P. Kumararathna,M.A.P.W.K. Malaviarachchci,W.M.W. Weerakoon,Won Byoung Chae,Myeong Cheoul Cho,A.M. Perera,Min-Kyeong Kim,Eun Young Yang 한국국제농업개발학회 2020 韓國國際農業開發學會誌 Vol.32 No.1
스리랑카는 채소의 주년 생산에 적합한 기후를 갖고 있는 열대국가이다. 열대, 아열대 채소의 재배면적은 전체 농지(105,062 ha)의 약 3%이다. 지난 50년 동안 스리랑카에서 채소 육종에 관한 체계적인 연구가 이루어졌고 채소 부문은 지속적으로 증가하였다. 하지만 채소 육종, 재배 및 가공과 관련된 기술이 선진국에 비해 많이 뒤떨어져 있는 형편이다. 전통 육종법을 통해 개발된 다양한 농업적 형질을 가진 품종이 현재까지 스리랑카의 채소 생산에 이용되고 있지만 생명공학적 방법을 접목한 채소 품종 육종법의 중요성이 점차로 부각되고 있다. 본 논문은 스리랑카에서 중요한 채소 작물인 토마토, 고추류, 콩류, 가지 및 여주의 육종과 품종 현황을 소개하고 향후 스리랑카 육종 전망에 대해 논의하였다. Sri Lanka is a tropical country having a favourable climate for year around vegetable production. Many tropical and sub-tropical vegetables are grown in approximately 3% of total agriculture lands (105,062ha). In Sri Lanka, systematic studies on vegetable improvement have been conducted for 50 years and, since then, Sri Lanka has gradually increased its vegetable sector. However, Sri Lanka fall behind in technologies for vegetable breeding, cultivation and processing compared with developed countries. Cultivars with various agronomic characteristics developed through conventional breeding approach have been contributed to vegetable production in Sri Lanka. Since the crop improvement through conventional breeding has been realized at a slower phase, integrated approach with biotechnological tools became important for vegetable development. Here, we provided the current states of five major vegetables such as tomato, capsicum, beans, brinjal and bitter gourd and their leading cultivars. The outlook of breeding activities in Sri Lanka was also discussed.
이계완,조정완,김길무 대한금속재료학회(대한금속학회) 1972 대한금속·재료학회지 Vol.10 No.1
CO·CO₂가스 분위기하에서의 Fe-W 용융체에 대한 슬래그-용강간의 반응을 1,650℃ 및 1,750℃에서 검토하였다. Pco/Pco₂=5.0 이상에서 텅스텐의 슬래그-용강간의 분포, [W]/(WO₃)는 다음 반응평형에 따라 결정된다. (WO₃)+3[Fe]=[W]+3(FeO) log K_f=-22,300/T+10.66 슬래그-용강간의 반응에 대한 평형항수, K_f는 1,650℃의 경우 Pco/Pco₂=3.3이하에서 점차로 감소하고, 1,750℃의 경우는 Pco/Pco₂=5.0 이하에서 급격히 감소한다. 슬래그상중의 (FeO)함량은 Pco/Pco₂가 감소함에 따라 다음 반응에 의하여 증가한다. [Fe]+CO₂=(FeO)+CO 공기중에서 용해할 때 슬래그-용강간의 반응을 다음과 같이 추정하였다. (WO₃)+2.5[Fe]=[W]+2.5(FeO_(1.2)) log K_i=-14,288/T+6.31 Slag-metal reactions for iron-tungsten melts under CO·CO₂ gas atmosphere are investigated at 1,650℃ and 1,750℃. When Pco/Pco₂ is more than 5.0, slag-metal distributions of tungsten, [W]/(WO₃), can be determined by the following reaction equilibriclm. (WO₃)+3[Fe]=[W]+3(FeO) log K_f=-22,300/T+10.66 The equilibrium constant, K_f, for the slag-metal reaction slightly decreases when Pco/Pco₂ is less than 3.3 at 1,650℃, and suddenly decreases below Pco/Pco₂=5.0 at 1,750℃. (FeO) contents of slag phase increase, as Pco/Pco₂ decrease according to the following reaction, [Fe]+CO₂=(FeO)+CO, An estimation for slag-metal reactions on open melting is as follows; (WO₃)+2.5[Fe]=[W]+2.5(FeO_(1.2)) log K_i=-14,288/T+6.31
Laminin B1 Gene Expression of the Preimplantation Mouse Embryo During Blastocoel Formation
Kang, M. K.,Kim, K.,Kim, K. W.,Cho, W. K. 한국유전학회 1988 Genes & Genomics Vol.10 No.4
Laminin is an extracellular matrix glycoprotein consisting of three N-glycosylated polypeptides (A, B1, and B2), which is exclusively located in basement membrane. Laminin appears to be involved in the cell adhesion and differentiation, but the molecular action of laminin in the blastocoel formation of the mouse embryo is not yet determined. Therefore, the present study examines the regulation of laminin B1 gene expression in the preimplantation mouse embryos using RNA-blot hybridization with laminin B1 cDNA (389bp). Messenger RNA encoding laminin B1 was present in the mouse early blastocyst, and increased in the process of blastocyst expansion. Moreover, treatments with retinoic acid (0.1μM), cholera toxin (2㎍/㎖), and/or forskolin (10㎍/㎖) for 6hr in the early blastocysts resulted in increment of laminin B1 mRNA signal together with expansion of the blsatocoel volume. These data thus suggest that the cAMP-induced laminin B1 gene expression may play an important role in the blastocoel formation in situ.
조원국(W.K. Cho),최도형(D.H. Choi),김문언(M.U. Kim) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
A numerical optimization procedure is developed to find the inlet velocity profile that yields the most uniform epitaxial layer in a vertical MOCVD reactor. It involves the solution of fully elliptic equations of motion. temperature, and concentration; the finite volume method based on SIMPLE algorithm has been adopted to solve the Navjer-Stokes equations. The overall optimization process is highly nonlinear and has been efficiently treated by the sequential linear programming technique that breaks the non-linear problem into a series of linear ones. The optjmal profile approximated by a 6th-degree Chebyshev polynomial is very successful in reducing the spatial non-uniformity of the growth rote. The optimization is particularly effective to the high Reynolds number flow. It is also found that a properly constructed inlet velocity profile can suppress the buoyancy driven secondary flow and improve the growth-rate uniformity.
조성우(S.W.Cho),최상민(S.M.Choi),배충식(C.S.Bae),노석홍(S.H.Noh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Measurement tecliniques were developed to quantify the instantaneous piston assembly friction force and the oil film thickness between the piston rings and the cylinder liner. That can be easily applied to small multi-cylinder production engine. The friction force and oil film thickness data were acquired under various operation conditions and for various oils in an SI four cylinder engine. In this study, friction force data were found to be more reliable in consequence of proper compensation. It was possible to measure oil film thickness on thin oil ring rails as well as compression rings. The results revealed that mixed lubrication is dominant in limited operating conditions where product of kinematic viscosity and mean piston speed is lower than 80xl0^-6m³/s2.<br/>
조용무(Y.M.Cho),유웅재(W.J.Yoo),김재도(J.D.Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This present paper deals with the characteristric of wire vibration of wire EDM by laser beam measurement. In order to mesure frequency of the wire vibration, we developed laser beam measurement using Si-photo diode. There are also presented the results of the experimental researches. The frequency of the wire vibration is varied with feed rate, wire speed, voltage and offtime. Among these parameters, wire speed is very much influenced the frequency. It is possible that the optimum condition is predicted by the developed laser beam measurement.
인간 Prourokinase가 도입된 체세포를 이용한 소 형질전환 복제란 생산: 표지유전자 발현정도에 따른 효과
J. K. Cho,M.M.U. Bhuiyan,G. Jang,G. Jang,Park, E. S.,S. K. Kang,Lee, B. C.,W. S. Hwang 韓國受精卵移植學會 2002 한국동물생명공학회지 Vol.17 No.2
Human Prourokinase (proUK) offers potential as a novel agent with improved fibrin specificity and, as such, may offer advantages as an attractive alternative to urokinase that is associated with clinical benefits in patients with acute peripheral arterial occlusion. For production of transgenic cow as human proUK bioreacotor, we conducted this study to establish efficient production system for bovine transgenic embryos by somatic cell nuclear transfer (NT) using human prourokinase gene transfected donor cell. An expression plasmid for human prourokinase was constructed by inserting a bovine beta-casein promoter, a green fluorescent protein (GFP) marker gene, and human prourokinase target gene into a pcDNA3 plasmid. Cumulus cells were used as donor cell and transfected with the expression plasmid using the Fugene 6 as a carrier. To increase the efficiency for the production of transgenic NT, development rates were compared between non-transfected and transfected cell in experiment 1, and in experiment 2, development rates were compared according to level of GFP expression in donor cells. In experiment 1, development rates of non-transgenic NT embryos were significantly higher than transgenic NT embryos (43.3 vs. 28.4%). In experiment 2, there were no significant differences in fusion rates (85.4 vs. 78.9%) and cleavage rates (78.7 vs. 84.4%) between low and high expressed cells. However, development rates to blastocyst were higher in low expressed cells (17.0 vs. 33.3%), and GFP expression rates in blastocyst were higher in high expressed cells (75.0 vs. 43.3%), significantly.