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환경적 footprint 분석을 통한 토양경작법과 화학적산화법의 비교
김윤수,임형석,박재우,Kim, Yun-Soo,Lim, Hyung-Suk,Park, Jae-Woo 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.3
In this study, land farming and chemical oxidation of a diesel-contaminated site is compared to evaluate the environmental impact during soil remediation using the Spreadsheet for Environmental Footprint Analysis by U.S. EPA. Each remediation process is divided into four phases, consisting of soil excavation, backfill and transportation (Phase 0), construction of remediation facility (Phase 1), remediation operation (Phase 2), and restoration of site and waste disposal (Phase 3). Environmental footprints, such as material use, energy consumption, air emission, water use and waste generation, are analyzed to find the way to minimize the environmental impact. In material use and waste generation, land farming has more environmental effect than chemical oxidation due to the concrete and backfill material used to construct land farming facility in Phase 1. Also, in energy use, land farming use about six times more energy than chemical oxidation because of cement production and fuel use of heavy machinery, such as backhoe and truck. However, carbon dioxide, commonly considered as important factor of environmental impact due to global warming effect, is emitted more in chemical oxidation because of hydrogen peroxide production. Water use of chemical oxidation is also 2.1 times higher than land farming.
실험연구 : Propofol이 백서 자궁 평활근의 수축에 미치는 영향
오경희 ( Kyung Hee Oh ),안태훈 ( Tae Hun An ),정종달 ( Jong Dal Jung ),소금영 ( Keurn Young So ),임형석 ( Hyung Suk Lim ),송창훈 ( Chang Hun Song ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.52 No.1
Background: Propofol is an alternative to thiopental as an intravenous induction agent for cesarean section. It is also used as a sedative for supplementation of regional blockade during cesarean section. It has been reported that propofol relaxes not only vascular smooth muscle but also other smooth muscles. The aim of this study was to investigate the effect of propofol on rat uterine smooth muscle in an isolated preparation in the rat. Methods: Uterine smooth muscle tissues were obtained from rats (n = 21). The muscle strips were suspended in tissue baths and isometric tension was recorded. After spontaneous or oxytocin induced activity had been accomplished in the buffer solution as a control, propofol (1 to 20μg/ml) in fat emulsion was applied cumulatively to the bath and the effects were continuously recorded. Results: In vitro, propofol induced a dose-dependent inhibition of spontaneous as well as oxytocin induced myometrial contractile activity. Propofol concentration of 1 μg/ml had no significant effects on the resting tension, active tention, and frequency of contraction developed by spontaneous and oxytocin induced uterine contractility. However, Complete muscular relaxations on spontaneous and oxytocin induced contractility were obtained at a concentration of 10 μg/ml and 20μg/ml, respectively. Conclusions: Propofol inhibits spontaneous and oxytocin-induced uterine smooth muscle contractions in dose dependent pattern. (Korean J Anesthesiol 2007; 52: 76~80)