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토양중 신생 및 숙성 Bentazon 잔유물의 벼에 의한 흡수
이재구,경기성,Fuhr, F 한국농화학회 1989 Applied Biological Chemistry (Appl Biol Chem) Vol.32 No.4
The amounts of ^(14)CO₂ evolved during the ^(14)C-bentazon aging in soil for 3 and 6 months were 6.1 and 14.8% of the original radioactivity, respectively. The presence of earthworms in soil tended to increase the uptake of ^(14)C-bentazon by the roots of rice plants, even if it was not statistically significant. The evolution of ^(14)CO₂ from ^(14)C-bentazon in soil increased in the presence of rice plants and earthworms compared with in the absence of them. The uptake of ^(14)C-bentazon residues by rice plants decreased remarkably with increasing the aging period within the limit of 3 months both in the absence and presence of earthworms, but there is not much difference between 3-month-aging and 6-month-aging. Much larger amounts of ^(14)C-labelled compounds were translocated to the shoots, compared with the data from a previous investigation using maize plants. The amount of non-extractable bound residue increased remarkably with the aging period up to 3 months. The polarity of the compounds extracted from soil increased with the aging and the growing of rice plants, indicating the formation of some polar metabolites.
이재구,함영복,김도태,김성동 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.4
The hydraulic energy regenerative brake system is introduced in this work. An accumulator stores kinetic energy during braking action, and the stored energy is used in a following acceleration action. The dynamic model of the brake system is derived for computer simulation study, and the Runge-Kutta numerical integration method is applied to the simulation work. Since the model contains several unknown parameters, these were determined by datas which had been proceded. Through a series of computer simulation, dynamic performance of the energy regenerative brake system is compared with that of a conventional system in which a conventional brake circuit is used. A series of test is carried out in the laboratory. The dynamic characteristics of the hydraulic motor system, such as the surge pressure and response time, are investigated in both brake action and acceleration action.
全北 地方 韓牛의 肝蛭 感染率 및 肝蛭症의 病理學籍 所見에 關한 調査 硏究
李宰求,林秉武,韓斗錫 전북대학교 농업과학기술연구소 1973 農大論文集 Vol.4 No.-
In order to survey the infection rate of Fasciola spp. 2,505 Korean cattle from Jeonbug District were tested by means of skin reaction, and 33 morbid livers of naturally infected Korean cattle with Fasciola spp. butchered at Jeonju abattoir were observed pathologically. The results of the studies are as follows : 1.As many as 782(31 4%) out of 2,505 Korean cattle were naturally parasitized with Fasciola spp and regional ranges of infection ratio were great(19.2-80%). 2, Adult cattle revealed higher infection rate than youg but no outstanding difference was observed between male and femle. 3. It was generally observed that severe atrophy of the left lobe and less severe form of caudate process was coupled with compensatory of the right one. 4. The hypertrophy and expansion of the bile ducts of which some were made visible like branches of a tree, were mostly found in the left lobe, and mucosae of the bile ducts became affected with calcareous infiltration in the serious cases. Changes of the bile ducts did not accord with infection rate of Fasciola spp. 5. The bile ducts revealed fibrosis, adenomatous proliferation of thick mucosae, and degeneration and desquamation of the epithelium. 6. Proliferation of connective tissue which led to Pressed atrophy of Parenchyma tissue was clearly observed in Glisson's sheath, Peribile duct, and interlobular tissue, along with infiltration of eosinophil and Iymphocyte.
이재구,Lee, Jae-Koo The Korean Society of Environmental Agriculture 1984 한국환경농학회지 Vol.3 No.1
Alachlor의 토양중 분해산물인 2,6-diethyl-N-(methoxymethyl) acetanilide(분해산물 1)와 2-hydroxy-2',6'-diethyl-N-(methoxymethrl) acetanilide (분해산물 2)를 합성하였다. 분해산물 1은 실온에서 아연분말 존재하에 alachlor를 3N-염산과 반응시켜서 얻었고 분해산물 2는 alachlor를 중탄산소다의 포화용액과 $90^{\circ}C$에서 78시간 반응시켜 합성하였다. 분해산물 2는 $5{\times}10^{-4}M$와 $1{\times}10^{-3}M$의 농도에서 특히 어린벼에 alachlor와 거의 같은 독성을 보인 반면 분해산물 1은 그 약효를 상실하였다. 따라서 alachlor 구조중의 염소원자를 수산기로 치환해도 alachlor의 식물독성은 별 영향을 받지 않으나 수소원자로 치환할 경우는 영향을 받는 것으로 보인다. Two of the degradation products of alachlor in soil. product 1, 2,6-diethyl-N-(methoxymethyl) acetanilide and product 2,2-hydroxy-2',6'-diethyl-(methoxymethyl) acetanilide were synthesized from alachlor reacting with 3N-hydrochloric acid in the presence of zinc powder at room temperature and a saturated sodium bicarbonate solution at $90^{\circ}C$ for 78 hr, respectively. At the concentrations of both $5{\times}10^{-4}M\;and\;1{\times}10^{-3}M$, product 2 exhibited almost the same phytotoxicity to rice seedlings, in particular, as alachlor, whereas product 1 lost its phytotoxic effectiveness. It seems that substitution of chlorine atom by hydroxyl group did not affect the phytotoxicity of alachlor, whereas substitution by hydrogen atom did.
몇가지 작물중 침투성 살충제 Carbofuran의 잔류량 분석
이재구,최신종,경기성,안기창,권정욱 충북대학교 농업과학기술연구소 1999 農業科學硏究 Vol.16 No.-
In order to ascertain the safety of the systemic insecticide carbofuran - treated crops. garlic, peanut and potato were collected randomly from markets near the major producing farms and analyzed for the residues of carbofuran and its main metabolite, 3-hydroxycarbofuran. The in vitro metabolism of carbofuran in phosphate buffer extracts of the crops was investigated. The results obtained were as follows. 1.The recoveries of carbofuran and 3- hydroxycarbofuran from the spiked samples were 92~ 100% in all samples. The detection limit and minimum amount of carbofuran detected were 0.02ppm and 0.1ng, and those of 3-hydroxycarbofuran 0.06ppm and 0.3ng, respectively. 2.Two mature garlic samples out of 20 contained 0.13 and 0.07ppm of carbofuran, respectively, showing a detection frequancy of 10%. The residue level was less than the maximum residue limit(0.5ppm) set by the health authorities in Korea. Only one mature garlic sample out of 20 contained 0.13ppm of 3-hydroxycarbofuran. 3.The residues of carbofuran and 3-hydroxycarbofuran in the immature garlic, peanut and potato samples were less than the detection limits. 4.The application of carbofuran to the fields of garlic, peanut and potato would be safe, considering that the estimated maximum acceptable daily intake of carbofuran from garlic was 0.0007mg which is 0.13% of the maximum acceptable daily intake(0.55mg) . 5.Carbofuran was hydrolyzed in vitro mainly to carbofuran phenol(m/z 164) in phosphate buffer extracts of the three crops in contrast to the major oxidative metabolism in situ. The amount of the metabolite increased with the incubation time.