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병아리콩 ( Cicer arietinum L. cv. Amethyst ) 근류내의 플라스티드 포스포프룩토오스 키나아제의 분리 및 특성
이회선(Hoi Seon Lee) 한국응용생명화학회 1998 Applied Biological Chemistry (Appl Biol Chem) Vol.41 No.5
The minor form of phosphofructokinase (EC 2.7.1.11; PFK), which was suggested to be of plastid origin from the host fraction of chickpea nodules, was isolated as a small protein with apparent molecular mass near 220 kDa and purified to a high degree. SDS-PAGE and western blot indicated that the enzyme was made up of a homotetrameric structure (55 kDa). The enzyme had sharp pH profiles with maximal activities at pH 8 and displayed Michaelis-Menten kinetics with respect to Fru-6-P and nucleoside triphosphate substrate at the pH optimum (pH 8) and at pH 7. MgATP was the most effective phosphoryl donor. Phosphoenolpyruvate was a potent inhibitor of minor PFK activity, and the enzyme was also strongly inhibited by 3-phosphoglycerate, 2-phosphoglycerate, and to a lesser extent, PPi. Minor PFK was weakly activated by KCl, NaCl and Pi, and was inhibitory at high concentration of KCl and Pi.
이회선,안용준 ( Hoi Seon Lee,Young Joon Ahn ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.2
Methanol extracts from 25 seed samples belonging to the family Leguminosae were subjected to an in vitro screening for their growth-promoting and inhibitory activities towards Bifidobacterium adolescentis, B. longum, B. bifidum, and Lactobacillus casei, using spectrophotometric and paper disc agar diffusion methods under O₂-free conditions, respectively. The responses varied with both bacterial strains and plant species. Among seed extracts, extracts from Glycine max (light-green color) and Arachis hypogaea (dark-brown) enhanced the growth of lactic acid bacteria in media with or without carbon sources, suggesting that bifidus factor(s) might be involved in the phenomenon. This growth-promoting effect was most pronounced with L. casei among lactic acid bacteria used. Additionally, all seed extracts did not adversely affect the growth of the lactic acid bacteria tested.
Hoi-Seon Lee(이회선),Gyung-Ja Choi(최경자),Kwang-Yun Cho(조광연),Sang-Gil Lee(이상길),Young-Joon Ahn(안용준) 한국농약과학회 2000 농약과학회지 Vol.4 No.3
Methanol extracts from 21 grains were tested for fungicidal activities against six phytopathogenic fungi and for insecticidal activities toward five insect pests in a greenhouse. The efficacy varied with both the plant pathogen/insect pest and grain species used. Potent fungicidal activity at 5 ㎎/pot, were produced from extracts of Elymus sibiricus and Hordeum vulgare var. nudum against Pyricularia grisea and Erysiphe graminis and these of Sesamum indicum (W) and Triticum aestivum against Puccinia recondita and Erysiphe graminis. At 2,500 ppm, potent insecticidal activities were exhibited from the extracts of Fagopyrum esculentum against Myzus persicae and Ischaemum crassipes, and these of Oryza sativa var. glutinosa, Panicum miliaceum, Setaria italica, Sorghum bicolor, and T. aestivum against Tetranychus urticae. All grain extracts revealed weak or no fungicidal and insecticidal effect against Phytophthora infestans, Plutella xylostella and Spodoptera litura. As a naturally occurring fungicide and insecticide, grain-derived materials described could be useful as new fungicidal and insecticidal products against phytopathogenic fungi and insect pests.
러시아산 고수종자에서 추출한 정유성분 및 구성성분의 쌀바구미 및 어리쌀바구미에 대한 살충효과
최선아 ( Seon-a Choi ),이회선 ( Hoi-seon Lee ) 한국응용생명화학회 2018 Journal of Applied Biological Chemistry (J. Appl. Vol.61 No.3
Essential oils of coriander (Coriandrum sativum L.) seeds were extracted by three extraction methods, steam distillation extraction (SDE), hexane extraction (HE) and supercritical extraction (SE), to compare their insecticidal activities against Sitophilus oryzae and S. zeamais. Although the essential oil extracted by HE and SE did not show insecticidal activities, the essential oil extracted by SDE showed the highest insecticidal activities against S. oryzae and S. zeamais. The chemical compositions of the essential oil extracted by SDE were analyzed by GC-MS. The most abundant compounds were linalool (59.92%), camphor (7.94%), linalool oxide (7.70%), p-cymene (7.44%), α- pinene (6.44%), limonene (3.29%) and geranyl acetate (3.19%). Camphor and linalool as major constituents showed the highest insecticidal activities against S. oryzae and S. zeamais whereas other constituents did not show insecticidal activities. As a result, the essential oil extracted by SDE, camphor and linalool showed a potential for development as insecticide against the storage pests.
Sang-Guei Lee(이상계),Hoi-Seon Lee(이회선),Chang-Yeon Hwang(황창연),Man-Jong Han(한만종),Hyung-Man Park(박형만) 한국농약과학회 2002 농약과학회지 Vol.6 No.3
In vivo metabolism study was carried out to find out the biochemical or metabolic tolerance mechanism between Diamond backmoth (DBM), Plutella xylostella and Beet armywarm (BAW), Spodoptera exigua to flupyrazofos. They showed some differences between the DBM and BAW. About 20% of flupyrazofos applied to the 3rd instar larvae of DBM was metabolized within 1 h and about 50% of that was metabolized within 4 h. The metabolites of flupyrazofos-oxon in 3rd instar larvae of DBM were increased 10 times more at 4 h than 1 h after application. The amounts of flupyrazol were nearly same between at 1 h and 4 h. The amount of unknown and origin increased 2 and 3 times more at 1 h than 4 h after application, respectively. In the 4th instar BAW larva, about 50% of flupyrazofos was metabolized within 1 h and about 70% of that was metabolized within 4 h. As metabolites, the amounts of flupyrazofos-oxon increased 2 times more at 4 h than 1 h after application. The amounts of flupyrazol increased 4 times more at 4 h than 1 h after application. The amount of unknown and origin increased 2.5 and 2 times more at 4 h than 1 h after application, respectively. From the study, it is supposed that hydrolytic enzyme, esterase, cleave the alkyl bond of flupyrazofos and conjugates with flupyrazofos. This seems to be the main tolerance mechanism of BAW to flupyrazofos.
Sang-Guei Lee(이상계),Chang-Yeon Hwang(황창연),Man-Jong Han(한만종),Jai-Ki Yoo(유재기),Hoi-Seon Lee(이회선) 한국농약과학회 2000 농약과학회지 Vol.4 No.1
Tolerance mechanism to flupyrazofos was examined with Plutella xylostella (L.) and Spodoptera exigua by investigating the penetration rate of flupyrazofos into larvae body. On determining effective washing of ¹⁴C-flupyrazofos, the washing volume to recover over 98% of ¹⁴C-flupyrazofos was observed at three times (each time: 1 mL). To select a suitable solvent, the recovery rates of each solvent in 3rd instar larvae of DBM were above 98%, but the washing rates of acetone, hexane and ethyl-acetate were 85.1%, 67.2% and 68.4%, respectively. In the BAW larvae, although the recovery rates of each solvent were above 99%, the washing rates of acetone, hexane and ethyl-acetate were 83.5%, 65.9% and 71.7%, respectively. The PT?? values of ¹⁴C-flupyrazofos were 0.731 h (44 min) in the DBM larva and 0.54 h (30 min) in the BAW larva. Radiocarbon in acetone washing (external fraction decreased more quickly in the BAW larva than in the DBM larva, and amount of radiocarbon in larvae body increased more quickly with time in the DBM larva than in the BAW larva. In contrast, amount of radiocarbon in excreta increased more rapidly with time in the BAW larva than in the DBM larva.
Toxicity of various fruit tree extracts to five agricultural and four stored-product anthropod pests
Sang-Guei Lee(이상계),Byeoung-Soo Park(박병수),Sung-Eun Lee(이성은),Jae-Gwon Son(손재권),Cheol Song(송철),Hoi-Seon Lee(이회선) 한국농약과학회 2001 농약과학회지 Vol.5 No.4
Methanol extracts from 43 materials of 17 fruit trees were tested for their insecticidal activities toward five agricultural and four stored-product anthropod pests. Efficacy varied with insect species, plant species, and tissue sampled. At a concentration of 2,500 ppm, strong activity was observed with extracts of Chaenomeles sinensis and Punica granatum seeds against Myzus persicae adult females, Vitis vinifera seeds against Nilaparvata lugens adults, Citrus junos, Citrus paradisi, Cucumis melo Linne var. reiiculatus, Diospyros kaki, Malus pumila var. dulcissima, Prunus persica, and V. vinifera seeds against Plutella xylostella, Citrus sinensis seeds against Spodoptera litura larvae, and Ch. sinensis and V. vinifera against Tetranychus urticae adults. Against four stored-product insect pests at 50 ppm, seed extracts of Ch. sinensis and V. vinifera against Sitophilus oryzae adults, and Ch. sinensis, C. junos, D. kaki, and V. vinifera against Callosobruchus chinensis adults gave over 80% mortality. Extracts of all samples exhibited little and no activity against Lasioderma serricome adults and Plodia interpunctella larvae.
Sang-Guei Lee(이상계),Gil-Hyong Chon(전길형),Hoi-Seon Lee(이회선),Chang-Yeon Hwang(황창연),Man-Jong Han(한만종),Hyung-Man Park(박형만) 한국농약과학회 2003 농약과학회지 Vol.7 No.1
The activities of esterase and acetylcholinesterase(AChE) on the Diamond backmoth (DBM), Plutella xylostella (Lepidoptera: Yponomeutidae) and Beet armywarm (BAW), Spodoptera exigua (Lepidoptera: Noctuidae) and inhibitions of AChE with flupyrazofos were clarified from the results of a series of experiments. These findings are described in brief as follows. The AChE activities of DBM and BA W in heads were 1.5~11.1l μ㏖/g/min in 1st~4th instar larvae of DBM and 1.7~45.2 μ㏖/g/min in lst~6th instar larvae of BAW, respectively. Those were 25-30 times higher in above 4th instar larvae of BAW than that of the 1st instar larvae of DBM. The activities of aliesterase in heads were 1.7~4.7 times higher in 2nd~4th instar larvae of DBM and 8~55 times higher in 3rd~6th instar larvae of BAW than 1st instar larvae of DBM. In abdomens, those were 3-17 times higher in 2nd~4th instar larvae of DBM and 12~30 times higher in 3rd~6th instar larvae of BAW than 1st instar larvae of DBM. Median AChE inhibition concentration (I??) of flupyrazofos to the 2nd instar larvae of DBM and BA W were 92 nM and 15 μM, respectively, and those to the 4th instar larvae of DBM and BAW were 1.8 μM and 3.1 mM, respectively. Insensitivity ratio of flupyrazofos in the 2nd instar BAW larvae showed ca. 162 times higher than that in the 2nd instar larvae of DBM, and that of the 4th instar BAW larvae showed ca. 1,720 times higher insensitivity to flupyrazofos than that of the 4th instar DBM larvae. AChE activities in the 2nd instar larvae of DBM and BA W at 32 h after applicaton of flupyrazofos decreased from 67.6% to 32.4% of the activity of the untreated control. That of the 4th instar larvae of DBM increased for 0.5 h after application flupyrazofos up to 75% of the untreated control, and after that it decreased to 34.5% of the untreated control at 32 h. In contrast, in the 4th instar larvae of BAW AChE activities increased for 8 h gradually up to 102% of the activity of the untreated control, and then the activity decreased to 97% of the untreated control at 16 h after treatment.
Sang-Gil Lee(이상길),Young-Joon Ahn(안용준),Ji-Doo Park(박지두),Jin-Cheol Kim(김진철),Kwang-Yun Cho(조광연),Hoi-Seon Lee(이회선) 한국농약과학회 2001 농약과학회지 Vol.5 No.3
Ethanol extracts from 46 plants were tested for their fungicidal activity against six plant diseases consisting of Maynaporthe grisea, Rhizoctonia solani, Botrytis cinerea, Phytophthora infestans, Puccinia recondita, and Erysiphe graminis in the greenhouse studies. Strong activity at 5 and 10 ㎎/pot was produced from the extracts of Helianthus annuus flowers and Zea mays leaves against P. grisea. In a test with B. cinerea, extracts of H. annuus leaves, H. annuus flowers, Chrysanthemum coronarium var. spatiosum, Cucurbita moschata seeds, Lycopersicon esculentum, Z. mays, and Z. mays leaves had strong activities at 5 ㎎/pot. In a test with P. recondita, strong activity was obtained from the extracts of Capsicum frutescens, C. moschata seeds, H. annuus seeds, L. esculentum, and Malva verticillata at 5 ㎎/pot. Against E. graminis, extracts of Cucumis sativus, H. annuus seeds, Salanum tuberosum, Z. mays, and Z. mays leaves produced strong activities at 10 ㎎/pot. All the extracts were ineffective against P. infestans and R. solani. Among seven extracts tested, the extracts of H. annuus leaves and flowers were highly effective against all the strains of B. cinerea resistant to carbendazim, procymidone, and diethofencarb. Furthermore, potent fungicidal activity was produced from the extracts of C. coronarium var. spatiosum and C. moschata seeds against the SSR, SRR, and RSR strains of B. cinerea, and Z. mays and Z. mays leaves against SSR and RSR. Extract of L. esculentum showed very strong activity only against RRS of B. cinerea.