• Korean Journal of Plant Taxonomy
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• v.34 no.1
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• pp.9-26
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• 2004

Texa of Lycoris in Korea were classified as five species with two varieties and revised taxonomically. Among the examined taxa, five Korean endemic plants were clarified: Lycoris flavescens M. Kim et S. Lee, L. uydoensis M. Kim, L. chejuensis Tae et S. Ko, L. chinensis var. sinuolata Tae et S. Ko, and L. sanguinea var. koreana (Nakai) T. Koyama. It was found that L. flavescens, L. uydoensis, and L. chejuensis were the natural hybrids between taxa of M+T karyotype and A karyotype. A specimen collected on Aug. 20, 1987 by M. Kim was designated as a holotype of Lycoris flavescens M. Kim et S. Lee. Lycoris flavescens var. uydoensis was ranked up to L. uydoensis. A key to all species including descriptions of each taxon was provided.

• Korean Journal of Plant Taxonomy
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• v.33 no.4
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• pp.387-392
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• 2003

For Lycoris chinensis Traub var. sinuolata K. Tae et S. Ko ex K. Tae et S. Ko, Korean endemic plant, latin description is add to the previous study, and a key including L. chinensis Traub and L. aurea Herb. which are closely related to the above variety, is newly provided.

• Journal of the Korean hospital association
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• v.14 no.4 s.123
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• pp.6-9
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• 1985

• Radioisotope journal
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• v.12 no.1
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• pp.16-21
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• 1997

• Cement
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• s.188
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• pp.27-37
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• 2010

• Analytical Science and Technology
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• v.15 no.5
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• pp.433-438
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• 2002

Trace elements in two air filters (V-50, P-50) artificially loaded with urban dust provided from IAEA were determined non-destructively using instrumental neutron activation analysis. Standard reference material (Urban Particulate Matter, SRM 1648) of National Institute of Standard and Technology was used for analytical quality control. About 20 elements in both of loaded filter samples were determined. To evaluate inter-laboratory comparison and proficiency test, analytical data were statistically treated with the results which collected from 49 laboratories, 40 countries participated in this study using neutron activation analysis, particle induced X-ray emission, inductively coupled plasma mass spectroscopy, etc,. From the results of statistical treatment, Z-scores are within ${\pm}2$. Furthermore, accuracy and precision of obtained analytical values are passed according to the criteria of the proficiency test. Consequently, it was proved that analytical quality for air dust samples being performed has been controlled properly.

• Korean Journal of Weed Science
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• v.31 no.4
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• pp.330-339
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• 2011

This study was conducted to determine the herbicidal activity of herbicidal substances and identify them in bulbs of Lycoris flavescens. Methanol extract was purified by a series of chromatographic techniques including silica gel column chromatography, preparative TLC, and HPLC. The final HPLC gave two active fractions and two herbicidal substances were obtained. By GC/MS analysis, one was identified as galanthine (galanthan-1-ol) and the other was identified as montanine ($O^2$-methyl pancracine), an isoquinoline alkaloid. Montanine showed nearly 100% of growth inhibition on the shoot and root of barnyardgrass (Echinochloa crusgalli) seedlings at $20{\mu}g\;mL^{-1}$ as compared with the control. Meanwhile, methanol extract of L. flavescens bulbs showed only about 3.1% and 8.3% of growth inhibition on the shoot and root of rice cultivar, Hwayeongbyeo seedlings at $1,000{\mu}g\;mL^{-1}$ as compared with the control, respectively.

• Korean Journal of Weed Science
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• v.30 no.4
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• pp.437-444
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• 2010

This study was conducted to determine the herbicidal activity of allelochemicals and identify herbicidal compounds in bulbs of Lycoris chinensis var. sinuolata. Methanol extract was purified by a series of silica gel flash column chromatography and HPLC. The final HPLC gave two active fractions and an herbicidal compound was obtained. By GC/MS analysis, the herbicidal compound was identified as montanine ($O^2$-methyl pancracine), an isoquinoline alkaloid. Montanine showed 100% of growth inhibition on the shoot and root of barnyardgrass (Echinochloa crus-galli) seedlings at $50\;{\mu}g\;mL^{-1}$ as compared with the control.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.06a
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• pp.432-432
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• 2005

사용후핵연료시료 중에 함유된 요오드(I-127 및 129)를 정량하기 위하여 화학적 방법으로 분리 회수하고 중성자방사화분석법을 이용하였다. 사전실험으로 모의사용후핵연료를 이용하여 회수율을 측정하였다. 모의 및 실제사용후핵연료시료를 $90^{\circ}C$에서 8 M $HNO_3$ 용액으로 용해하고 용해 후 용해용액 중의 잔류 요오드, 응축 및 휘발된 요오드 각각을 정량하였다. 응축 요오드는 핵연료 용해 후 재증류하여 회수하였다. 잔류 및 응축 요오드는 시료의 산화상태를 조절한 후 용매추출로 요오드를 회수한 다음 이온교환 또는 침전법으로 방사화학적으로 분리한 후 중성자방사화분석(RNAA)으로 정량하였다. 제작한 이온교환분리관 및 여과키트에 요오드를 흡착 또는 침전시켜 분리한 다음 중성자조사를 위한 삽입체(Insert)로 이용하였다. 휘발 요오드는 제조한 흡착체(Ag-silica gel)를 담은 흡착관에 포집하고 홉착체를 구간별 균질시료로 만든 다음 비파괴중성자 방사화분석(INAA)으로 정량하였다. 침전 및 흡착 요오드의 화학적 특성을 EPMA(electron probe microanalysis) 분석으로 조사하였다. 요오드 정량결과를 다른 방법으로 비교분석하기 위하여 음이온교환수지상에서 요오드를 정제 및 회수하기 위한 용리거동을 조사하였다.

• Korea Petroleum Association Journal
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• s.272
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• pp.56-58
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• 2009