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Structure and action mechanism of humic substances for plant stimulations
Jeon, Jong-Rok,Yoon, Ho Young,Shin, Gyeong-Im,Jeong, Song Yi,Cha, Joon-Yung,Kim, Woe-Yeon The Korean Society of Grassland and Forage Science 2018 한국초지조사료학회지 Vol.38 No.3
Humic substances that can be obtained from coal resources such as leonardite in a bulk scale have been employed as crop stimulators and soil conditioners. The polymeric organics containing a variety of aromatic and aliphatic structures are known to activate plants in a multifunctional way, thus resulting in enhanced germination rate and abiotic stress resistance concomitant with induction of numerous genes and proteins. Although detailed structural-functional relationship of humic substances for plant stimulations has not been deciphered yet, cutting-edge analytical tools have unraveled critical features of humic architectures that could be linked to the action mechanisms of their plant stimulations. In this review article, we introduce key findings of humic structures and related biological functions that boost plant growth and abiotic stress resistance. Oxygen-based functional groups and plant hormone-like structures combined with labile and recalcitrant carbon backbones are believed to be critical moieties to induce plant stimulations. Some proteins such as HIGH-AFFINITY $K^+$ TRANSPORTER 1, phospholipase A2 and $H^+$-ATPase have been also recognized as key players that could be critically involved in humic substance-driven changes in plant physiology.
도시민의 선호를 바탕으로 한 농촌마을의 관광자원 실태와 정비방향
전영미 ( Jeon Yeong Mi ),임상봉 ( Im Sang Bong ),한경수 ( Han Gyeong Su ),박윤호 ( Park Yun Ho ),장은숙 ( Jang Eun Sug ),김범수 ( Kim Beom Su ) 한국농촌계획학회 2003 농촌계획 Vol.9 No.1
The objective of the study is to suggest planning directions for practical use and to find the conditions of tourist attractions in rural villages founded on city-dweller`s preference. Both a questionnaire and a field were used for the study. selected were four villages such as Oryan-ri, Junggi-ri, and Gyochon-ri. The results of the study are as fallows: City-dweller`s valued on natural environment resources in rural tourism and felt uncomfortable to accommodations. The scoring system reflecting functions of six resources showed that common problems encountered in rural tourism were lacks of people`s organization, and human exchange mind, and tourism-related leasure places and facilities. Based upon the results, some measures to develop villages were suggested.
Urogastrone이 Insulin 투여로 인한 흰쥐의 위점막손상에 미치는 영향
임대순 ( Im Dae Sun ),이은경 ( Lee Eun Gyeong ),전재윤 ( Jeon Jae Yun ),이상인 ( Lee Sang In ),문영명 ( Mun Yeong Myeong ),강진경 ( Kang Jin Gyeong ),박인서 ( Park In Seo ),최흥재 ( Choe Heung Jae ) 대한내과학회 1990 대한내과학회지 Vol.38 No.6
N/A As has been known, urogastrone inhibits gastric acid secretion and stimulates epithelial cell proliferation so that it can accelerate the healing of chronic gastric and duodenal ulcers, and prevent the formation of gastric and duodenal ulcers. In order to investigate the effect of urogastrone on insulin-induced gastric mucosal injuries, as well as the mechanism of the protective effect, the present study was carried out with Sprague-Dawley rats by using urogastrone, which is isolated from human urine. The following results were obtained. 1) Gastric mucosal injuries were observed only in the oxyntic mucosal area of the rats, which were sacrificed five hours after a subcutaneous injection of insulin(5U/㎏). 2) Insulin-induced gastric mucosal injuries were prevented by administering urogastrone, intraperi toneally and intragastrically in doses above 200㎍/㎏ at a schedule of two hours before and 0, 1, 2, 3 and 4 hours after insulin injection. 3) The basal and insulin-induced gastric acid secretion of the rats with an acute gastric fistula was not inhibited at doses of 200㎍/㎏(×6) urogastrone, which was administered intraperitoneally and intragastrically. 4) The level of DNA synthesis did not increase in the gastric oxyntic mucosa for seven hours after the start of urogastrone administration at doses of 200㎍/㎏(×6). However, significant stimulated DNA synthesis was found when the urogastrone wasintraperitoneally administered at eight-hour intervals for three days. In conclusion, these results showed that intraperitoneal and intragastric administration of urogastrone provided a cytoprotective effect on the gastric mucosa against insulin-induced injury in rats. This protective effect of urogastrone administration was not mediated by its-gastric acid inhibitory action, but might be attributed to the early effect of gastric mucosal proliferation.