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이희동(Heedong Lee),김광호(Kwangho Kim),이자현(Jahyeun Rhi),신욱철(Wookcheol Shin),박현주(Hyeonju Park),이수형(Soohyung Lee),박승순(Seungsoon Park) 한국농약과학회 2004 농약과학회지 Vol.8 No.2
To confirm physico-chemical stability of formulated products, this study was conducted under different storage conditions; room temperature and accelerated temperature of 54℃. The tested pesticide formulations were dichlorvos 50% EC, acephate 50% WP, hymexazol 4% DP, thiram 80% WP and isoprothiolane 12% GR. The selected formulations were stored for 10 weeks and 5 years under the given temperature in maximum and contents of active ingredients were also analyzed by GLC or HPLC after each time of storage. The degradation rates of 5 active ingredients under the two conditions showed a similar trend except acephate. Acephate was rapidly decomposed at 54℃ but slowly decomposed at room temperature, and the degradation rate under the accelerated condition was 2.4 to 5-fold higher than that under the room temperature. Consequently, the stability test on active ingredients in pesticide formulations was able to recommend to be carried out under the accelerated condition except acephate. And the physical properties of all formulations tested under two storage conditions were good.
이희동(Heedong Lee),경기성(Kee Sung Kyung),권혜영(Hyeyoung Kwon),임양빈(Yang Bin Ihm),김진배(Jinbae Kim),박승순(Seungsoon Park),김장억(Jangeok Kim) 한국농약과학회 2004 농약과학회지 Vol.8 No.2
The study was carried out to investigate the pesticide residual characteristics in peaches, pear and grape. Pesticide residue patterns were remarkably different because of major factors affecting the pesticide residue patterns such as ratios of surface to weight, surface matrices, cultivations, sizes, increase rate of weight, and varieties of fruits, etc.. Pesticide residue levels in grape appeared higher than those in peaches and pear, because the pesticide solution sprayed was infiltrated and accumulated between grape granules. The matrices composing of fruit surface and the ratios of surface area to weight on fruits seemed to play a key role for determining the pesticide residual characteristics in fruits.
권혜영(Hyeyoung Kwon),김진배(Jinbae Kim),이희동(Heedong Lee),임양빈(Yang-Bin Ihm),경기성(Kee Sung Kyung),박인희(In-hee Park),최정(Jung Choi) 한국농약과학회 2004 농약과학회지 Vol.8 No.1
This study estimated the correlation between surface area/weight ratios and pesticide residues in two varieties of tomato, mini tomato and tomato. The ratios of surface area/weight of mini tomato and tomato were 2.15 ㎠g?¹ and 1.00 ㎠g?¹, respectively. Pesticide residues were measured with four kinds of pesticide, chlorothalonil WP, chlorothalonil SC, oxadixyl WP, thiophanate-methyl WP. The residue amount of mini tomato was 1.4~2.4 times higher than those in tomato regardless of the application date and frequency. The ratios of surface area/weight on tomato varieties played a key role for determining pesticide residue.
약제 살포 후 경과일수별 세척에 의한 방울토마토의 잔류농약경감
권혜영(Hyeyoung Kwon),김진배(Jinbae Kim),이희동(Heedong Lee),임양빈(Yang-Bin Ihm),경기성(Kee Sung Kyung),권오경(Oh-Kyung Kwon),최달순(Dalsoon Choi),최주현(Ju-Hyun Choi) 한국농약과학회 2006 농약과학회지 Vol.10 No.4
The objective of this study was to compare the reduction of residues in/on mini-tomato by washing methods and to evaluate the relation of reduction rates in different pesticides. Mini-tomato was sprayed with three commercial pesticides, oxadixyl, thiophanate-methyl and chlorothalonil, and harvested for washing test as 0, 5 and 7 days elapsed. The reduction rates of oxadixyl in/on mini-tomato were 61, 11 and 4%, those of thiophanate-methyl were 89, 89 and 79%, and in case of chlorothlaonil, reduction rates were 84, 84 and 88%, respectively. When mini-tomato at 0 day and 5 days after spray was washed by 0.02% of Sur-ten<SUP>®</SUP> solution, its pesticide residues were reduced by 81 and 55% on oxadixyl, 95 and 91% on thiophanate-methyl, and 97 and 98% on chlorothlaonil. When three wettable powdered pesticides with the same recipe were sprayed, their reduction rates in/on mini-tomato by washing with water at 0, 5 and 7 days were 76, 66 and 43% on oxadixyl, 91, 83 and 82% on thiophanate-methyl, and 65, 68 and 82% on chlorothlaonil, suggesting that the washing effect may be dependent on the amounts of active ingredients and inert types of the pesticides used.
인체 피부 섬유모세포의 BK_(Ca) Channel에 대한 Sodium Nitroprusside의 효과
이희동 외 중앙대학교 의과대학 의학연구소 2005 中央醫大誌 Vol.30 No.2
To investigate the presence of large conductance, Ca^(2+) activated K+ ( BK_(Ca)) channel in human fibroblasts and also examine the effect of nitric oxide (NO) on BK_(Ca) channels that may be modulated by cyclic nucleotides activations of protein kinase, we isolated human fibroblasts from genital skin. Cells of 4th ~5th passages were used for the experiments. The whole cell outward current was sensitive to NS1619 (a selective BK_(Ca) channels activator) and iberiotoxin (IBTX a specific inhibitor of BK_(Ca) channels). The mean single-channel conductance in symmetrical KCl (145 mM) was 238 ± 6 pS (n = 5). The cument was reversed at 0 mV, Ca^(2+) dependent and blocked by low doses of TEA. In cell-attached mode, SNP (1 mM) increased the NPo of the channel significantly. In inside-out configuration, however, not increased that indicating involvement of a soluble second messenger. The stimulation effect of SNP on BK_(Ca) channels was inhibited by ODQ, a soluble guanylate cyclase inhibitor pretreatment and pretreatment of KT5823, a specific PKG inhibitor. In conclusion, the present study suggest that SNP increased BK_(Ca) channels in human skin dermal fibroblasts and that this effect was mediated through a cGMP pathway.