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양파(Allium cepa L.) 유전자원의 Flavonol 배당체 조성 및 함량
이 정로,이 민기,김 헌웅,이 성현,이 영민,장 환희,황 경아,곽 재균,고 호철,김 정봉,조 진웅 한국작물학회 2014 Korean journal of crop science Vol.59 No.3
Flavonols as a major kind of plant secondary metabolites are known for health-promoting compounds in onions (Allium cepa L.). The objectives of this study are to determine profiles of flavonol glycosides in different 75 onion accessions. A total of five flavonols (quercetin 3,4'- diglucoside, Q34'diG; quercetin 3-glucoside, Q3G; quercetin 4'-glucoside, Q4'G; isorhamnetin 4'-glucoside, I4'G; quercetin, Q) were identified from onion accessions. In positive ion mode using LC-ESI-MS, individual flavonols were confirmed from one and two glycosylation binding with aglycone such as quercetin and isorhamnetin. Total flavonol contents were distributed in white onion (range of 0.18-6.47 mg/g DW) and purple onion accessions (range of 2.39-6.47 mg/g), respectively. The mean of flavonol contents in purple onion (4.41 mg/g) showed 1.4-fold higher than white onion (3.23 mg/g). The Q34'diG and Q4'G were considered as the major compounds of flavonol glycosides in onion accessions.
In-situ catalytic pyrolysis of lignin in a bench-scale fixed bed pyrolyzer
호다,Pouya Sirous Rezaei,노동훈,제정호,김범식,정상철,성봉현,박영권 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
Thermal and in-situ catalytic pyrolysis of lignin were carried out in a bench-scale pyrolyzer. The yield and composition of the bio-oil produced were influenced largely by the type of lignin samples, pyrolysis temperature, and nitrogen carrier gas flow rate. The highest bio-oil yield of 35.95 wt.% was achieved using kraft lignin at 500 C and a carrier gas flow rate of 600 ml/min. In-situ catalytic pyrolysis resulted in a decrease of the bio-oil yield, but the aromatic product distribution was altered greatly depending on the types of catalysts. In-situ catalytic pyrolysis also showed enhanced selectivity to valuable aromatic hydrocarbons.
이예진,호다,김재곤,전종기,정상철,이인구,박영권 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
Tungstated zirconia (WO3/ZrO2 with WO3 loadings of 9.9 (WZ9.9), 15.5 (WZ15.5), and 15.7wt% (WZ15.7)) and Amberlyst (15, 35, 36, 39 and 45) catalysts were employed to upgrade pyrolysis bio-oil of acacia sawdust through an esterification reaction using methanol at atmospheric pressure and room temperature or 80 oC. The upgrading efficiency was evaluated by measuring the total acid number (TAN) and viscosity. The viscosity and TAN of the resulting upgraded bio-oil were found to be dependent on the calcination temperature of the WO3/ZrO2 catalysts. At room temperature, the largest decrease in viscosity and TAN of the bio-oil and methanol mixture was obtained using WZ9.9 tungstated zirconia calcined at 900 oC. An increase in reaction temperature to 80 oC improved the flowability and TAN of the methanol-added bio-oil using WZ9.9 activated at 900 oC. The product distribution of the bio-oil upgraded using methanol revealed esterification to be the dominant reaction pathway under the reaction conditions of this study. When the ether extracted bio-oil was upgraded at 80 oC using methanol over catalysts, the Amberlyst catalysts were found more effective than tungstated zirconia catalysts in enhancing the esterification reaction and reducing TAN.
Stabilization of bio-oil over a low cost dolomite catalyst
김한나,호다,김재곤,강보성,전종기,정상철,이인구,박영권 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.4
A low cost alkaline catalyst of dolomite (CaMg(CO3)2) was used to stabilize acacia sawdust bio-oil mixed with methanol. The upgrading efficiency was evaluated in terms of the total acid number (TAN) and viscosity. A change in the dolomite calcination temperature from 700 to 900 oC led to a significant change in the TAN and viscosity of the methanol-added bio-oil. Dolomite activated at higher temperatures had larger amounts of active CaO and MgO species due to the enhanced decarboxylation of calcium and magnesium carbonates. An increase in the dolomite content (1-5 wt%) decreased the TAN value of bio-oil remarkably. A thermal aging test of the methanol-added bio-oil upgraded using dolomite (calcined at 900 oC) at 50 oC for 24 h was carried out by storing the bio-oil at 80 oC for one week. Although the TAN value increased after the aging process, it was still lower than the TAN of raw bio-oil. In addition, increasing the methanol content (10-30 wt%) decreased the TAN and viscosity of the bio-oil significantly.
최석,조경원,류종현,김준수,문현식,김명영,박광철,호광식,장성종,염철호,윤평진,전제열 대한약리학회 2004 The Korean Journal of Physiology & Pharmacology Vol.8 No.3
The interstitial cells of Cajal (ICCs) are the pacemaker cells in gastrointestinal tract and generate electrical rhythmicity in gastrointestinal muscles. Therefore, ICC may be modulated by endogenous agents such as neurotransmitter, hormones, and prostaglandins (PGs). In the present study, we investigated the effects of prostaglandins, especially PGE2, on pacemaker currents in cultured ICCs from murine small intestine by using whole-cell patch clamp techniques. ICCs generated spontaneous slow waves under voltage-clamp conditions and showed a mean amplitude of -452±39 pA and frequency of 18±2 cycles/min (n=6). Treatments of the cells with PGE2 (1μM) decreased both the frequency and amplitude of the pacemaker currents and increased the resting currents in the outward direction. PGE2 had only inhibitory effects on pacemaker currents and this inhibitory effect was dose-dependent. For characterization of specific membrane EP receptor subtypes, involved in the effects of PGE2 on pacemaker currents in ICCs, EP receptor agonists were used: Butaprost (1μM), EP2 receptor agonist, reduced the spontaneous inward current frequency and amplitude in cultured ICCs (n=5). However sulprostone (1μM), a mixed EP1 and EP3 agonist, had no effects on the frequency, amplitude and resting currents of pacemaker currents (n=5). SQ-22536 (an inhibitor of adenylate cyclase; 100μM) and ODQ (an inhibitor of guanylate cyclase; 100μM) had no effects on PGE2 actions of pacemaker currents. These observations indicate that PGE2 alter directly the pacemaker currents in ICCs, and that the PGE2 receptor subtypes involved are the EP2 receptor, independent of cyclic AMP- and GMP-dependent pathway.
김원중,양 철 호 한국토지공법학회 2023 土地公法硏究 Vol.101 No.-
In modern society, disasters occur in various forms and cause serious damage to the people and society. The causes of disasters are due to a number of causes that cannot be determined by any single one. Natural disasters occur from natural phenomena, but social disasters are caused by human activities. Disasters that have recently occurred in our society account for the majority of social disasters rather than natural disasters. These social disasters can be seen as stemming from human selfishness and irresponsibility. A society safe from disasters can be realized if prevention and preparation, which are efforts to block disasters before they occur, and response and recovery to actively cope with disasters are systematically established In order to prepare active prevention and countermeasures against disasters, the 「Basic Act on Disaster and Safety Management」 has been enacted and implemented. In order to proactively and actively respond to and manage disasters, the basic law is divided into disaster prevention, preparation, response, and recovery. This Act sets out the basic matters for disasters, and serves as a basic law and action law for disasters. Since the 「Framework Act on Disaster and Safety Management」 contains many functional features besides the Basic Law, it poses problems such as the complexity of the regulations and the consistency of the legal system. In order to secure the people's right to safety through effective response to disasters, it is necessary to improve the problems of the current legal system. Therefore, this study analyzed the problems of prevention, preparation, response, and recovery for disasters stipulated in Chapters 4 through 7 of the contents of the laws acting as the basic law on disasters, and suggested improvement plans. A law can realize its value as a law when it has the most clear, specific, and systematic consistency. In order to secure the people's right to safety from disasters through the achievement of the clarity of these laws, an improvement plan was proposed as a way to be faithful to the nature of the Basic Law.