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C_(1)-HVOCs 제거를 위한 Ru-Sn/γ-Al_(2)O_(3) 촉매 제조 및 반응성 평가
김영주,황운연,구기갑,김용렬,박종수,윤왕래 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1
HVOCs 제거에 사용되는 백금-팔라듐계보다 저렴한 촉매 개발을 목적으로 다양한 루테늄계 촉매를 제도하여 C_(1)-HVOCs 분해 특성 평가 실험을 수행하였다. 그 결과 Ru[2]-Sn[2]/γ-Al_(2)O_(3) 촉매가 가장 우수한 성능을 보였다. 구조 증진제인 주석은 흡착 산소의 양을 증가시키고, 다양한 산소 이온 종의 생성에 기여함을 알 수 있었다. HVOCs 분해 반응에 첨가되는 산소 원자는 주로 루테늄과 주석에 흡착되며, CH_(3) 등 HVOCs는 지지체인 γ-Al_(2)O_(3)의 브뢴스테드 및 루이스 산점에 흡착됨을 알 수 있었다. 흡착된 HVOCs의 염소와 브뢴스테드 산점의 수소 화학 결합에 의한 HCl의 생성 반응이 HVOCs 분해의 주 반응 기구임을 알 수 있었다. Various ruthenium(Ru) based catalysts, which were less expensive than Pt-Pd based catalysts, were prepared and their activity with C_(1)-HVOCs(Halogenated Volatile Organic Compounds) was evaluated. Ru[2]-Sn[2]/γ-Al_(2)O_(3) was found to have the most desirable effect on the destruction of HVOCs. Tin taken as a structural promoter was found to increase the amount of oxygen adsorption and to generate various oxygen ions. Oxygen atoms were found to be mainly adsorbed on the surface of ruthenium and tin and HVOCs such as CH_(3)Cl to adsorbed on Bronsted and Lewis acid sites of γ-Al_(3)O_(3) supports. It was found that the formation of HCl by the reaction of chlorine in HVOCs with hydrogen atom on Bronsted acid site was the main reaction mechanism in the destruction of HVOCs.
Characterization of a Methyl Jasmonate Specific Esterase in Arabidopsis
Koo, Yeon Jong,Yoon, Eun Sil,Seo, Jun Sung,Kim, Ju-Kon,Choi, Yang Do The Korean Society for Applied Biological Chemistr 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.1
Methyl jasmonate (MeJA)-specific methyl esterase of Arabidopsis (AtMJE) was identified and characterized. AtMJE has high substrate specificity to MeJA compared to other related substrates, methyl indole-3-acetate (MeIAA) and methyl salicylate (MeSA). Through enzyme kinetics analysis, we found AtMJE has similar level of substrate affinity to JA carboxyl methyltransferase (AtJMT). However, AtMJE has 10 times lower catalytic efficiency than AtJMT at low substrate concentrations. AtMJE gene expression was suppressed for 2 h after MeJA treatment, even though its expression recovered and was induced to maximum level within 8 h after treatment. AtMJE overexpressing plants (AtMJEox) showed enhanced MeJA methyl esterase activity demonstrating esterase activity of AtMJE in vivo. AtMJEox plants responded differentially to JA and MeJA in root growth. MeJA in the media could be a source for more JA production in AtMJEox plants, which resulted in root growth inhibition. In contrast, AtMJEox plants grown on JA containing media showed similar root growth inhibition as wild-type. These results show that AtMJE functions in altering JA/MeJA ratios in Arabidopsis and increased JA, because the conversion of MeJA to JA enhances JA responsive gene expression.
Song, Jong Tae,Koo, Yeon Jong,Park, Jong-Beum,Seo, Yean Joo,Cho, Yeon-Jeong,Seo, Hak Soo,Choi, Yang Do Springer-Verlag 2009 Molecules and cells Vol.28 No.2
<P>We reported previously that overexpression of a salicylic acid (SA) methyltransferase1 gene from rice (OsBSMT1) or a SA glucosyltransferase1 gene from Arabidopsis thaliana (AtSAGT1) leads to increased susceptibility to Pseudomonas syringae due to reduced SA levels. To further examine their roles in the defense responses, we assayed the transcript levels of AtBSMT1 or AtSAGT1 in plants with altered levels of SA and/or other defense components. These data showed that AtSAGT1 expression is regulated partially by SA, or non-expressor of pathogenesis related protein1, whereas AtBSMT1 expression was induced in SA-deficient mutant plants. In addition, we produced the transgenic Arabidopsis plants with RNAi-mediated inhibition of AtSAGT1 and isolated a null mutant of AtBSMT1 and then analyzed their phenotypes. A T-DNA insertion mutation in the AtBSMT1 resulted in reduced methyl salicylate (MeSA) levels upon P. syringae infection. However, accumulation of SA and glucosyl SA was similar in both the atbsmt1 and wild-type plants, indicating the presence of another SA methyltransferase or an alternative pathway for MeSA production. The AtSAGT1-RNAi line exhibited no altered phenotypes upon pathogen infection, compared to wild-type plants, suggesting that (an)other SA glucosyltransferase(s) in Arabidopsis plants may be important for the pathogenesis of P. syringae.</P>
Floral Nectary-specific Gene NTR1 Encodes a Jasmonic Acid Carboxyl Methyltransferase
Seo, Hak Soo,Song, Jong Tae,Koo, Yeon Jong,Jung, Choonkyun,Yeu, Song Yion,Kim, Minkyun,Song, Sang Ik,Lee, Jong Seob,Hwang, Ingyu,Cheong, Jong-Joo,Choi, Yang Do 한국응용생명화학회 2001 Journal of Applied Biological Chemistry (J. Appl. Vol.44 No.3
NTR1 gene of Brassica campestris L. ssp. perkinensis encodes a floral nectary-specific methyltransferase. In this study, the NTR1 cDNA was expressed in E. coli to examine the enzymatic characteristics of the protein product. The GST-NTR1 fusion protein was purified to near homogeneity, showing that the size of NTR1 was 44 kDa. The protein reacted specifically with jasmonic acid (JA), consuming methyl group from S-adenosyl-L-methionine (SAM). GC-MS analysis revealed that the compound produced was authentic methyl jasmonate (MeJA), suggesting that NTR1 is an S-adenosyl-L-methionine: jasmonic acid carboxyl methyltransferase. Km values of NTR1 for JA and SAM were 38.0 and $6.4{\mu}M$, respectively. Optimal activity of the NTR1 was observed at $20^{\circ}C$, pH 7.5, in the presence of 100-150 mM KCl. Thus, kinetic properties, thermal characteristics, optimal pH, and ion-dependency of the NTR1 activity were almost identical to those of Arabidopsis JA methyltransferase JMT, indicating that these two proteins are orthologues of each other.
(Yang Do Choi,(Jong Joo Cheong,(Ing Yu Hwang,(Jong Seob Lee,(Sang Ik Song,(Min Kyun Kim,(Song Yion Yeu,(Choon Kyun Jung,(Yeon Jong Koo,(Jong Tae Song,(Hak Soo Seo 한국응용생명화학회 2001 Journal of Applied Biological Chemistry (J. Appl. Vol.44 No.3
NTR1 gene of Brassica campestris L.ssp.perkinensis encodes a floral nectary-specific methyltransferase. In this study, the NTRl cDNA was expressed in E. coli to examine the enzymatic characteristics of the protein product. The GST-NTR1 fusion protein was p
Applications of Hydrochemical Models for the Assessment of Groundwater
( Jong Yeon Hwang ),( Sunhwa Park ),( Moon-su Kim ),( Hun-je Jo ),( Gyeong-mi Lee ),( In Kyu Shin ),( Sang Ho Jeon ),( Da Hee Song ),( Deok-hyun Kim ),( Tae-seung Kim ),( Hyen Mi Chung ),( Hyun-koo Ki 한국환경분석학회 2017 환경분석과 독성보건 Vol.20 No.3
In this study, we focused on the evaluation and comparison of the physico-chemical characteristics and distribution of cations and anions in groundwater sampled from 2015 (485 samples) to 2016 (145 samples) in rural provinces of Korea. The major objectives of this study were as follows: 1) quality assessment of groundwater for special usage, such as agricultural or industrial applications; 2) the determination of groundwater types; and 3) the tracing of ion sources in groundwater. The assessment of the groundwater qualities from 2015 (n=480 samples) to 2016 (n=145 samples)) for agricultural usages were conducted using SAR (Sodium Adsorption Ratio), Na(%), RSC (Residual Sodium Carbonate), PI (Permeability Index), SSP (Soluble Sodium Percent), MH (Magnesium Hazard), KR (Kelly’s Ratio) and PS (Potential soil Salinity). Furthermore, the results of samples in 2015 were classified as SAR [Excellent (100%)], Sodium [(Excellent (34%), Good (55%), Permissible (9%), Doubtful (1.6%), Unsuitable (0.4%)], RSC [(Good (95.7%), Medium (3.5%), Bad (0.8%)], PI [(Excellent (40.6%), Good (59%), Unsuitable (0.4%)], SSP [(Excellent (26.3%), Good (59.8%), Fair (13.1%), Poor (0.8%)], MH [(Acceptable (94.4%), Non-Acceptable (5.6%)], and Kelly’s Ratio [(Permissible (93%), Non-Permissible (7%)], PS [(Excellent to Good (98%), Good to Injurious (1.2%), and Injurious to Unsatisfactory (0.2%)]. In addition, the groundwater sampled in 2016 was classified as SAR [Excellent (100%)], Sodium [Excellent (2.1%), Good (51.1%), Permissible (39.3%), Doubtful (6.2%), Unsuitable (0.7%)], RSC [Good (100%)], PI [Excellent (100%)], SSP [Excellent (0.7%), Good (37.2%), Fair (61.4%), Poor (0.7%)], MH [Acceptable (96.6%), Non- Acceptable (3.4%)], KR [Permissible (69.7%), (Non-Permissible (30.3%)], and PS [Excellent to Good (100%)]. Evaluations based on the Wilcox diagram were classified as “excellent to good” or “good to permissible” and the water quality evaluated using the U.S. Salinity Laboratory’s Diagram was classified as C1S1 (Excellent/ Excellent) and C2S1 (Good/Excellent) for all samples from 2015 to 2016. Moreover, in the application of two factors of the Langelier Saturation Index (LSI) and Corrosive ratio (CR), we obtained similar results for defining the suitability of groundwater for industrial purposes.
Jong S. Kim,Yeon-Jung Kim,Kyung Bok Lee,Jae-Kwan Cha,Jong-Moo Park,Yang-Ha Hwang,Eung-Gyu Kim,Joung-Ho Rha,Jaseong Koo,Jei Kim,Yong-Jae Kim,Woo-Keun Seo,김동억,Thompson G. Robinson,Richard I. Lindley,Xia 대한뇌졸중학회 2018 Journal of stroke Vol.20 No.1
Background and Purpose Following the positive results from recent trials on endovascular therapy (EVT), bridging therapy (intravenous alteplase plus EVT) is increasingly being used for the treatment of acute ischemic stroke. However, the optimal dose of intravenous alteplase remains unknown in centers where bridging therapy is actively performed. The optimal dose for eventual recanalization and positive clinical outcomes in patients receiving bridging therapy also remains unknown. Methods In this prospective Enhanced Control of Hypertension and Thrombolysis Stroke Study (ENCHANTED) sub-study, we explored the outcomes following treatment with two different doses (low- [0.6 mg/kg] or standard-dose [0.9 mg/kg]) of intravenous alteplase across 12 Korean centers where EVT is actively performed. The primary endpoint was a favorable outcome at 90 days (modified Rankin Scale scores 0 to 1). Secondary endpoints included symptomatic intracerebral hemorrhage (ICH) in all patients, and the recanalization rate and favorable outcome in patients who underwent cerebral angiography for EVT (ClinicalTrials.gov, number NCT01422616). Results Of 351 patients, the primary outcome occurred in 46% of patients in both the standard- (80/173) and low-dose (81/178) groups (odds ratio [OR], 1.14; 95% confidence interval [CI], 0.72 to 1.81; P=0.582), although ICHs tended to occur more frequently in the standard-dose group (8% vs.3%, P=0.056). Of the 67 patients who underwent cerebral angiography, there was no significant difference in favorable functional outcome between the standard- and low-dose groups (39% vs.21%; OR, 2.39; 95% CI, 0.73 to 7.78; P=0.149). Conclusions There was no difference in functional outcome between the patients receiving different doses of alteplase in centers actively performing bridging therapy.