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Jeong, Woong-Seob,Matsumoto, Toshio,Seon, Kwang-Il,Lee, Dae-Hee,Ree, Chang-Hee,Park, Young-Sik,Nam, Uk-Won,Pyo, Jeong-Hyun,Moon, Bong-Kon,Park, Sung-Joon,Cha, Sang-Mok,Park, Jang-Hyun,Lee, Duk-Hang,Le 한국우주과학회 2010 한국우주과학회보 Vol.19 No.1
The main payload of STSAT-3 (Science and Technology Satellite 3), MIRIS (Multipurpose InfraRed Imaging System) is the first Korean infrared space mission to explore the near-infrared sky with a small astronomical instrument, which is being developed by KA
Seed Dormancy and Germination Characteristics of Rumex obtusifolius
Thi Hien Le,Sug-Won Roh,Mirjalol Umurzokov,Aung Bo Bo,Weiqiang Jia,Kwang Min Cho,Kee Woong Park 한국잡초학회 2021 Weed & Turfgrass Science Vol.10 No.2
Exotic weeds are considered as one of the major threats for agro-ecosystem and global food security. Since, Rumex obtusifolius is one of the dominant exotic weeds in Korean landscape, turfgrass, or river banks, there is an urgency for its efficient management to protect the Korean agro-ecosystem. This study was conducted to investigate the germination characteristics under various environmental conditions such as seed dormancy, temperature, salt stress as well as effect of soil depths on seed emergence. R. obtusifolius seeds germinated 100% until 30 days after harvesting (DAH), after that the seed germination rate started to decrease until 270 DAH. The germination rate recovered from 300 DAH and finally reached 98.3% 360 DAH. Optimum temperature for R. obtusifolius seed germination was 25/15℃ to 30/20℃ (day/night). NaCl greatly affected the germination of R. obtusifolius seeds. Less than 50% of seeds germinated at 20 mM of NaCl and ceased at 320 mM. R. obtusifolius seedling emergence was strongly inhibited by burial depth. The germination declined with increasing the soil depth and stopped where the burial depth exceeded 3 cm. These results could be useful to develop integrated exotic weed management in the R. obtusifolius infested area in Korea.
Thi Hien Le,Seung Chul Shin,Jae Eun Song,Aung Bo Bo,Weiqiang Jia,Kwang Min Cho,Kee Woong Park 한국잡초학회 2021 Weed & Turfgrass Science Vol.10 No.2
Chenopodium album mainly occurred in roadsides, crop fields, wastelands, and near animal farms. We found that C. album produces two kinds of seeds those are black and brown type. The freshly mature brown seeds were non-dormant for the whole year. In contrast, there was considerable variation in the dormancy of the black seeds. The brown seeds germinated faster and seed germination rate was higher than the black seeds. An optimum temperature was 20/10℃ to 25/15℃ (day/night) for the germination of both type seeds. Germination rate of brown seeds was higher than the black seeds under various NaCl concentrations. At the 320 mM salinities, 10% of brown seeds germinated while the germination was not observed in the black seeds. The total seed protein content was much lower in the black seeds than in the brown seeds suggested that more energy might be available for radicle to break the seed coat in the brown seeds. The seeds full emerged at 0.5 cm and no emergence was seen beyond 4 cm burial depth. The results obtained from our study will be useful to maximize the efficiency of management tactics in the C. album infested area in Korea.
Effect of Environmental Factors on the Germination and Emergence of Erodium cicutarium
Thi Hien Le,Taehyun Oh,Aung Bo Bo,WeiQiang Jia,Kwang Min Cho,Kee Woong Park 한국잡초학회·한국잔디학회 2020 Weed & Turfgrass Science Vol.9 No.4
This study was conducted to investigate the distribution and seed biology of Erodium cicutarium in Chungnam province of Korea. E. cicutarium normally occurred in pastures, roadsides, and crop fields. During a whole year after harvest, E. cicutarium seed germination increased with increasing storage time. No germination was found until 60 days after harvest, and began to germinate 90 days after harvest and got reaching full germination 300 days after harvest. The optimum germination temperature was 20℃ and soaking in the sulfuric acid for 20 minutes was the most suitable method to break seed dormancy. Germination of E. cicutarium seeds was decreased by increasing NaCl concentrations. Up to 10 mM of NaCl did not affect E. cicutarium seed germination and less than 20% of seeds germinated at 160 mM of NaCl. Approximately, 78% of seeds emerged at 0.5-2 cm of sowing depth but the seeds did not emerge at a burial depth greater than 4 cm. These results will be useful to develop integrated exotic weed management in the E. cicutarium infested area in Korea.
( Yuri Cho ),( Jeong Hoon Lee ),( Dong Hyeon Lee ),( Min Jong Lee ),( Jeong Ju Yoo ),( Won Mook Choi ),( Young Youn Cho ),( Yun Bin Lee ),( Eun Ju Cho ),( Su Jong Yu ),( Nam Joon Yi ),( Kwang Woong Le 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background/aims: Some patients with hepatocellular carcinoma (HCC) beyond the Milan criteria (MC) have favorable tumor biology, and that these patients would have low risk of tumor recurrence after living donor liver transplantation (LDLT). This study was designed to develop a model of tumor recurrence after LDLT for HCC beyond the MC, so as to select the best candidates for LDLT in HCC beyond the MC. Methods: Consecutive patients who had undergone LDLT beyond the MC at Seoul National University Hospital between September 2001 and January 2013 were analyzed. Demographic, clinical, and tumor characteristics were evaluated and a model to predict recurrence after LDLT (MoRAL score) was created. Results: A total of 104 patients were included. The median follow-up was 52.7 (range, 1.6-157.5) months. Their 5-year overall survival and cumulative recurrence rates were 70.4% and 41.8%, respectively. In multivariate analysis, independent pretransplant risk factors for HCC recurrence were serum AFP (OR=1.003, P=0.013) and PIVKA-II (OR=1.001, P=0.050) levels. AFP reflected maximal tumor size and PIVKA-II reflected tumor number and type (nodular or diffuse/infiltrative) (all P<0.001). Using Cox proportional hazards model, MoRAL score ( )was derived (median, 108.3; range 33.7-3928.3). The concordance statistic of MoRAL (0.836) was superior to CLIP score (0.772), TNM stage (0.600), JIS stage (0.601) and T classification (0.626). The tumor recurrence after LDLT was significantly related to mortality (OR=21.6, P<0.001). Conclusions: A new model to predict tumor recurrence of HCC patients beyond the MC after LDLT based on objective parameters provides refined prognostication (Figure 1). External validation is warranted.