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돼지 적출 심관상동맥에 있어서 혈관주위 신경자극에 의한 purinoceptor의 효과
전석철,심철수,김주헌,Jeon, Seok-cheol,Shim, Cheol-soo,Kim, Joo-heon 대한수의학회 1998 大韓獸醫學會誌 Vol.38 No.4
To elucidate whether or not innervation of purinergic nerve and functional action of $P_{2X}$-, $P_{2Y}$-purinoceptor, the neurogenic effects of perivascular nerve stimulation were investigated using by physiograph recording system in isolated coronary artery of pig. 1. The contractile responses induced by perivascular nerve stimulation (20V, 0.5msec, 20sec) were the frequency (2~64Hz) dependent manner. 2. The neurogenic contractile responses induced by perivascular nerve stimulation were inhibited by the pretreatment with either ATP or adenosine ($10^{-7}{\sim}10^{-4}M$). 3. The neurogenic contractile responses induced by perivascular nerve stimulation (20V, 16Hz, 0.5msec, 20sec) were increased by the pretreatment with reactive blue 2, but were not affected by the pretreatment with 8-phenyltheopylline ($10^{-5}M$). 4. The neurogenic contractile responses induced by perivascular nerve stimulation (20V, 16Hz, 0.5msec, 20sec) were inhibited by the desensitization of the P2X-purinoceptor using by treatment of $10^{-5}M$, -methylene ATP as 3 times over again. The accomplished present study on isolated coronary artery of pig suggest that purinergic nerve is innervated and that the neurogenic contractile response was mediated by activation of $P_{2X}$-purinoceptor and the neurogenic relaxative response was mediated by activation of both $P_1$ and $P_{2Y}$-purinoceptor.
沈?政(Shen Xuezheng),?祝成(Su Zhucheng),李幸哲(Lee Haengcheol) 동아인문학회 2020 동아인문학 Vol.50 No.-
Through the study of tea poetry in Tang dynasty, this paper aims at sorting out the connotation elements of Chinese tea culture spirit. First of all, based on the contemporary literature related to tea culture with high citation rate, we sorts out the concept words of spiritual connotation of tea culture, and concludes that “Qing, Jing, He, Jing, Yi, Zhen” are the high-frequency words in the core spirit of Chinese tea culture. Secondly, combining with the analysis of tea poetry in the Tang dynasty as a specific text context, the text analysis and statistics of the core spiritual connotation of tea culture are carried out to trace and deconstruct the core spiritual connotation of tea culture. Thirdly, taking the Huzhou poets group in the Tang dynasty as the case study, carries on the detailed poetry analysis. Finally, the conclusion is drawn that the Chinese tea culture in the Tang dynasty has the cultural and spiritual connotation of “tranquility”, which, together with the current pursuit of “respect and harmony” culture, forms the dual characteristics of Chinese tea culture, reflecting the different use values of “we” and “others” respectively. With the development of history, Chinese tea culture shows the differences of mainstream thoughts due to the demands of specific times or social groups.
Hexanoic acid - crown ether system을 이용한 europium과 yttrium의 용매추출효과의 향상
심대선,한혜림,김세미,김정훈,김영운,정노희,강호철 한국유화학회 2015 한국응용과학기술학회지 Vol.32 No.1
용매추출법에서 희토류 금속을 효과적으로 분리하기 위해 추출제만 사용하는 것이 아니라 crown ether와 같은 첨가제를 이용하는 연구를 하였다. Host-guest 화합물인 macrocyclic ligand는 금 속과 착화물을 형성하는데, 이 때 crown ether의 cavity 크기와 비슷한 크기의 금속 이온들과 안정한 착 화물을 형성한다. 이전 연구에서 europium과 yttrium을 분리하기 위해 여러 사슬 길이의 지방산 추출제 를 이용한 추출실험을 행하였었다. 이를 토대로 분리효율이 좋지 않았던 hexanoic acid에 크기가 다른 crown ether (18-crown-6 ether, 15-crown-5 ether, 12-crown-4 ether)를 첨가하여 분리효과가 증가 하는 것을 연구하였다. hexanoic acid의 농도별로 분리효율을 본 후 가장 분리 효율이 좋은 농도에서 crown ether를 종류와 농도를 다르게 하여 첨가하였다. 그 결과 0.05 M hexanoic acid에서 분리능이 1.72으로 가장 높게 나타났고, crown ether를 첨가하였을 시 분리능이 0.002 M 15-crown-5 ether에서 가장 높게 나왔으며 기존의 분리능보다 2배 이상 더 높았다. 또한 crown ether를 첨가하였을 때 두 금 속이 MLR3·3RH의 형태로 추출되는 것도 확인 할 수 있었다. The synergistic solvent extraction of rare earth elements such as europium and yttrium has been investigated by the extractant with crown ether as an additive. Macrocyclic ligand as host-guest compounds form more stable complexes with metal ions which have the similar size of the cavity of crown ether. In our previous study[14] founded that the extraction used fatty acid of the various alkyl chain length. Based on the results of the previous experiment, the synergistic separation effect of two metals investigated that the hexanoic acid had was the worst extraction effect which added a crown ether such as 18-crown-6 ether, 15-crown-5 ether, and 12-crown-4 ether. In this study, the concentrations of hexanoic acid have showed the separation effect, and then the concentrations and kind of crown ether are performed for synergistic extraction at the hexanoic acid concentration of the highest separation effect. As a results, the separation rate is the highest value of 1.72 at 0.05 M hexanoic acid, and 0.002 M 15-crown-5 ether is the best value in other concentrations and kind of crown ether, it is about twice of using only hexanoic acid. Moreover, the extraction species of two metals has been founded MLR3·3RH form when added the crown ether.
지표 개발을 통한 우리나라 교통 SOC 스톡의 국제비교
신의철,이재민(Lee, Jae-Min),심양주 대한교통학회 2004 대한교통학회 학술대회지 Vol.46 No.-
사회간접자본(SOC)은 교통, 통신, 전력 등 국가전체의 경제활동에 필요한 기반을 제공하는 공공시설로 정의되는데, 국가 예산상으로는 도로, 철도, 지하철, 공항, 항만 등 교통시설 외에 다목적댐, 치수, 용수사업을 SOC사업으로 분류하고 있다. 우리 경제의 경쟁력 강화를 위해서는 주요 사회간접자본 특히, 도로, 철도, 항만, 공항 등의 교통 인프라를 적기․적소에 공급하여 물류비용을 절감시켜 효율적인 생산 및 소비활동을 뒷받침해야 한다. 사회간접자본 부족을 타개하기 위한 정부 노력의 결과, 교통부문 SOC투자의 경우 2003년에 13.9조원으로 지난 5년간 32.7% 증가하였다. 그러나 이러한 교통부문 SOC 투자규모 대해서, 국가경제 규모에 비해 과잉 투자가 이루어지고 있으므로 줄여야 한다는 견해와 향후 일정기간 지속적으로 현재의 교통 SOC 투자가 유지되어야 한다는 견해가 대립되고 있는 실정이다.
돼지 적출 심관상동맥에 있어서 perivascular nerve stimulation에 의한 cholinergic 수축 작용
심철수,박상은,전석철,한방근,김주헌,Shim, Cheol-soo,Park, Sang-eun,Jeon, Seok-cheol,Han, Bang-keun,Kim, Joo-heon 대한수의학회 1995 大韓獸醫學會誌 Vol.35 No.2
The effects of various autonomic blocking agents to perivascular nerve stimulation were investigated on isolated coronary artery of pig. 1. The magnitude of contractile response to perivascular nerve stimulation increased with increasing frequency(280Hz) of stimulation. 2. The contractions to perivascular nerve stimulation(40V, 40Hz, 0.5msec, 1min) were increased by pretreatment of the cholinestrase inhibitor, physostigmine. 3. The contraction to perivascular nerve stimulation(40V, 40Hz, 0.5msec, 1min) was antagonised by the muscarinic antagonist, atropine. 4. The contraction to perivascular nerve stimulation(40V, 40Hz, 0.5msec, 1min) was blocked by the neural blocker, tetrodotoxin. 5. The contractions to perivascular nerve stimulation(40V, 40Hz, 0.5msec, 1min) were not significantly affected by the ${\alpha}$-adrenergic antagonist, phentolamine or ${\beta}$-adrenergic antagonist, propranolol. 6. The contractile response by the acetylcholine was increased by the pretreatment of cholinestrase inhibitor, physostigmine. This findings suggest that the powerful excitatory action by the perivascular nerve stimulation may be linked to muscarinic receptor by cholinergic nerve excitation in coronary artery of pig.