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임양빈(Yang-Bin Ihm),경기성(Kee-Sung Kyung),박영섭(Young-Sup Park),이희동(Hee-Dong Lee),김진배(Jin-Bae Kim),임건재(Gun-Jae Im),류갑희(Gab-Hee Ryu) 한국농약과학회 2002 농약과학회지 Vol.6 No.4
This experiment was conducted to elucidate the effects of fruit bagging on the amounts of pesticide residues on/in pears with two pesticides, chlorpyrifos 25% WP and penconazole 5% WP, and two pear cultivars, Niitaka and Hwangeum-bae. Residues of chlorpyrifos and penconazole in bagged pears were only 0.4~27% of those in non-bagged one. Residues of both pesticides in bagged and non-bagged pears were steeply reduced in the field but slowly reduced during storage. Residues of chlorpyrifos were more in the peel than in the flesh, while penconazole in bagged pear was evenly distributed in the peel and flesh. Chlorpyrifos was evenly distributed in outer bag and inner bag irrespective of bag materials, while most of penconazole was found in outer bag rather than in inner bag. To produce safer pear from pesticide residues, removal of bag before storage is recommended.
약제 관주처리에 의한 양액재배 토마토의 역병 방제 및 농약잔류 특성
임양빈(Yang-Bin Ihm),이중섭(Jung-Sup Lee),경기성(Kee-Sung Kyung),김찬섭(Chan-Sub Kim),오경석(Kyeong-Seok Oh),진용덕(Yong-Duk Jin),이병무(Byung-Moo Lee) 한국농약과학회 2002 농약과학회지 Vol.6 No.4
To establish effective and safe control method against Phytophthora root rot caused by Phytophthora capsici on tomato in hydroponic culture, three pesticides, oxadixylㆍcopper hydroxide 8% WP, metalaxylㆍcopper oxychloride 15% WP, and dimethomorphㆍdithianon 38% WP at 4 concentration levels were tested on potato dextrose agar medium inoculated with Phytophthora capsici. All pesticides inhibited mycelial growth, but two pesticides of them, metalaxylㆍcopper oxychloride WP and dimethomorphㆍdithianon WP, were selected as effective pesticides for the efficacy test in a hydroponic culture. Forty days after transplanting of tomato seedlings, 4 ㎖ of sporangia of P. capsici (about 25 sporangi/㎖) per plot was inoculated around tomato plant root, and then 5 days after inoculation, the pesticides diluted at 5,000 times were drenched 1, 2 or 3 times per plot on the culture cube at 15 days interval. Fifteen days after drenching, tomato fruits and hydroponic culture solution were sampled for the analysis of pesticide residues. Dimethomorph was detected 0.001 and 0.003 ㎎/㎏ in tomato of the plots sprayed 2 and 3 times with dimethomorphㆍdithianon WP of which detection levels were far below compared with 1.0 ㎎/㎏ of the Korean MRL of dimethomorph on tomato. Incidences of Phytophthora root rot were 30.5~50% in the plots drenched at 1 or 2 times with metalaxy1ㆍcopper oxychloride WP, and 16.7~25% in the plots treated with dimethomorphㆍdithianon WP. However, there was no incidence of Phytophthora root rot in the plots treated at 3 times with both of pesticides, showing no phytotoxic effect. Based on the results, the drenching of these pesticides on the culture cube could be recommended as a very safe and effective control method for Phytophthora root rot in tomato.
임양빈(Yang-Bin Ihm),김경선(Kyoung-Sun Kim),경기성(Kee-Sung Kyung),김남숙(Nam-Suk Kim),하헌영(Huen-Young Ha),이희동(Hee-Dong Lee),오경석(Kyeong-Seok Oh),김정원(Jung-Won Kim),류갑희(Gab-Hee Ryu) 한국농약과학회 2003 농약과학회지 Vol.7 No.4
In order to get the actual pesticide usage data for fruit crops at fanner's gate, this survey was carried out on the growers of 6 representative fruit crops such as apple, citrus, grape, peach, pear and persimmon, in Korea. One hundred fifty farmers were selected in main production areas to record their pesticide usage during the growing seasons. Pesticides were sprayed in pear 15.2 times/year and persimmon 7 times/year. Pesticide input amount per unit for fruits was 39.5 for citrus, 22.1 for apple, 21.5 for pear, 11.9 for peach, 10.8 for persimmon and 6.7 a.i. ㎏/㏊ for grape, respectively. The amounts of pesticides sprayed in 2002 except for peach and pear tend to decrease compared with those in 1999. The major fungicides used were mancozeb, propineb, dithianon, etc., while the major insecticides were fenitrothion, chlorpyrifos, methidathion, etc. Total active ingredients of pesticides used for six fruit crops amounted to 18.3% of total sales amount of pesticides for horticulture in 2002. The amounts of pesticides sprayed on citrus, grape, peach and pear in Korea was less than those in U.S.A., excepting those in apple.
살충제 imidacloprid의 물 및 물-토양계 중 광분해
임양빈(Yang Bin Ihm),경기성(Kee Sung Kyung),김찬섭(Chan Sub Kim),최병렬(Byeong Ryeol Choi),홍수명(Soo Myung Hong),이재구(Jae Koo Lee) 한국농약과학회 2004 농약과학회지 Vol.8 No.1
To elucidate the photolysis characteristics of the insecticide imidacloprid in the environment, [¹⁴C]imidacloprid was treated into water and paddy soil-water system. In water system, the amount of ¹⁴C-radioactivity distributed in aqueous phase was rapidly increased up to 80% of total ¹⁴C in water during 7 days of exposure to sunlight. Also, the amounts of imidacloprid in water at day 0 and 3 days after treatment were 1.2461 and 0.8594 ㎎/㎏, respectively, not being detected 7 days after treatment, indicating rapid degradation of imidacloprid in water by sunlight. One photodegradation product, imidacloprid urea, in which the N-NO₂ moiety of imidacloprid was replaced by oxygen, was detected from water in water and water-paddy systems. The amount of the metabolite detected from water in water system was 0.0112 ㎎/㎏ 1 day after treatment and reached the top concentration of 0.0391 ㎎/㎏ 7 days after treatment. In case of water-paddy system, its amount was 0.0117 ㎎/㎏ 1 day after treatment and reached the highest concentration of 0.0259 ㎎/㎏ 3 days after treatment. Rapid transformation of imidacloprid into polar compounds continued until 7 days after treatment, considering that 80% of ¹⁴C in water distributed in aqueous phase 7 days after treatment. The amount of imidacloprid was 1.6538 ㎎/㎏ at day 0 and 0.8785 ㎎/㎏ 1 day after treatment, not being detected after 15 days, indicating rapid degradation of imidacloprid in water-paddy soil system by sunlight. The direct degradation of imidacloprid to imidacloprid urea would be a major photodegradation pathway in water and water-paddy soil systems.
농약의 양액 탱크내 혼합처리에 의한 토마토 역병 방제 효과 및 잔류 특성
임양빈(Yang-Bin Ihm),경기성(Kee-Sung Kyung),김찬섭(Chan-Sub Kim),박병준(Byung-Jun Park),이중섭(Jung-Sup Lee) 한국농약과학회 2003 농약과학회지 Vol.7 No.4
To control effectively and safely Phytophthora root rot caused by Phytophthora capsici on tomato in hydroponic culture, tank-mixing method was considered with two pesticides, metalaxylㆍcopper oxychloride 50% WP and dimethomorphㆍdithianon 38% WP. Forty days after transplanting of tomato seedlings, 4 mL of sporangia of P. capsici (about 25 sporangi/mL) per plot was inoculated around tomato plant roots, and at 5 days after inoculation, the pesticides tank-mixed at three dilution levels, 12,500, 25,000 and 50,000, were drenched 1, 2 or 3 times per plot on the culture cube every 15 days for metalaxylㆍcopper oxychloride 50% WP and every 10 days for dimethomorphㆍdithianon 38% WP. During the drenching period, the residue levels of metalaxyl and dimethomorph in hydroponic culture solution were similar to the initial levels but the level of dithianon was drastically decreased from one day after tank-mixing. In tomato drenched with metalaxylㆍcopper oxychloride 50% WP, metalaxyl was detected 0.02~0.04 ㎎/㎏ in all diluted plots. Dimethomorph was detected 0.012~0.021, 0.001~0.006 and 0.001~0.003 ㎎/㎏ in 12,500, 25,000 and 50,000 times diluted plots, respectively, while dithianon was detected 0.005, 0.003 ㎎/㎏ in 12,500 and 50,000 times diluted plots, respectively. The detection levels of three pesticides were far below compared with the levels of Korean MRLs. Incidences of Phytophthora root rot were not found in all the plots, but phytotoxic responses were recognized in the 12,500 times diluted plots of both pesticides. Based on the above results, the drenching of the culture solution tank-mixed with these pesticides could be recommended as a very safe and effective method to control Phytophthora root rot in tomato in hydroponic culture.
살충제 imidacloprid의 붕어(Carassius auratus L.)중 행적 및 장기에 대한 독성
임양빈(Yang Bin Ihm),김찬섭(Chan Sub Kim),이희동(Hee Dong Lee),정미혜(Mihye Jeong),김대규(Dae Kyu Kim),경기성(Kee Sung Kyung) 한국농약과학회 2006 농약과학회지 Vol.10 No.4
In order to elucidate the behavior of the insecticide imidacloprid (1-(6-chloro-3-pyridylmethyl)-Nnitroimidazolidin-2-ylideneamine) in crucian carp (Carassius auratus L.) and its effects on the internal organs of crucian carp, the crucian carps were exposed to [<SUP>14</SUP>C]imidacloprid at a predicted environmental concentration of 0.064 ㎎/L for 4 days. Imidacloprid in water was absorbed into crucian carps to reach the maximum concentration at 2 days after exposure. Unknown major metabolite and imidacloprid urea, minor metabolite, were detected in test water. The amounts of the [<SUP>14</SUP>C]imidacloprid and its metabolites absorbed in gall were much higher than those in the other parts, strongly suggesting that biliary excretion involving enterohepatic recirculation could be an import route for the elimination of imidacloprid absorbed in crucian carps. Meanwhile, no toxic effects of imidacloprid on liver and kidney as well as the genital organs such as testis and ovary were observed by microscopic inspection.
송세빈 ( Se Bin Song ),김양균 ( Yang Gyun Kim ),이설라 ( Sul Ra Lee ),이동영 ( Dong Young Lee ),정경환 ( Kyung Hwan Jeong ),문주영 ( Ju Young Moon ),이상호 ( Sang Ho Lee ),임천규 ( Chun Gyoo Ihm ),이태원 ( Tae Won Lee ) 대한신장학회 2010 Kidney Research and Clinical Practice Vol.29 No.5
목적: 경동맥의 내막-중간막 두께(carotid artery-intima-media thickness, cIMT)는 혈액 및 복막 투석을 받고 있는 만성 신부전 환자에서 심혈관 질환과 관련된 사망의 예측인자임은 이미 알려져 있으나 투석 전 만성신질환 환자에 대한 연구 결과는 부족하였다. 이에 만성신질환 환자들의 신기능 단계에 따른 경동맥의 내막-중간막 두께 변화를 확인하고자 본 연구를 계획하였다. 방법: 2005년 1월1일부터 2009년4월30일까지 경희대학교 부속병원에 내원한 사구체 여과율 60 ml/min/1.73m2 미만의 만성신질환 환자 중 고해상도 B모드 경동맥 초음파를 시행한 환자 88명 (남:여=49:39)을 대상으로 정상 신기능의 대조군 30명 (남:여=13:17)과 경동맥 내막-중간막 두께를 비교하였다. 결과: 경동맥의 평균 내막-중간막 두께는 사구체여과율의 감소에 따른 만성신질환의 단계가 증가될수록 통계적으로 유의하게 증가하였는데 그 두께는 만성신질환 단계가 3, 4, 5단계로 악화되면서 각각 0.82±0.19 mm, 0.93±0.13 mm, 그리고 1.04±0.27 mm로 증가하였다. 또한 정상 성인과 비교하여 모든 만성신질환 단계에서 경동맥 내막-중간막 두께가 통계적으로 유의하게 증가된 상태임을 확인하였다. (p=0.002). 당뇨성 신질환의 경우 비당뇨성 신질환에 비해 그 두께는 증가하였으나 통계적으로 유의하지 않았다. (0.96±0.32 vs. 0.92±0.20, p=0.142). 다중회귀분석에서는 나이와 사구체여과율, 만성신질환 단계가 경동맥 내막-중간막 두께와 유의한 상관성을 보였다. 결론: 만성신질환 환자에서 투석전 초기 신기능 저하 단계에서부터, 경동맥의 동맥경화는 진행되어 있었으며 경동맥의 내막-중간막 두께는 나이 및 사구체여과율 만성신질환 단계와 상관관계가 있었다. Purpose: Carotid artery intima-media thickness (cIMT) has been reported as the predictive factor of mortality of cardiovascular disease in dialysis patients but only a few reports are available on the patients with earlier stages. We compared cIMT according to the stage of chronic kidney disease, and analyzed the data in association with cardiovascular risk factors. Methods: Study subjects were 88 patients with chronic kidney disease less than 60 ml/min/1.73m2 of glomerular filtration rate. cIMT was measured by means of high- resolution B-mode ultrasonography. Cardiovascular risk factors and cIMT were analyzed and compared with 30 subjects with normal renal function. Results: cIMT was significantly increased with the stage of chronic kidney disease. When the stage was increased from 3 to 5, cIMT was increased (p=002). cIMT was further increased in all stages of chronic kidney disease than in patients with normal kidney function. But association of diabetic chronic kidney disease with non-diabetic chronic kidney disease was not significant (p=0.127). Multiple regression analysis showed that cIMT in patients with chronic kidney disease was significantly correlated to age, glomerular filtration rate, and the stage of chronic kidney disease. Conclusion: We suggest that carotid atherosclerosis could increase in no dialysis patients with early stage of chronic kidney disease. Carotid artery intima-media thickness was correlated with age, glomerular filtration rate, and the stage of chronic kidney disease.