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Cho, Kanghee,Kim, Jungsu,Park, Jong-ho,Jung, Taesung,Beum, Hee Tae,Cho, Dong-woo,Rhee, Young Woo,Han, Sang Sup Elsevier 2019 Microporous and mesoporous materials Vol.277 No.-
<P><B>Abstract</B></P> <P>We synthesized nanoporous CO-selective adsorbent composed of CuCl supported on bayerite. Before supporting the CuCl, the bayerite chemical was calcined at 623 K to increase the surface area to 469 m<SUP>2</SUP> g<SUP>−1</SUP>. The CuCl was highly dispersed on the activated bayerite via a thermal monolayer dispersion process. The highest CO adsorption capacity was achieved at an optimal temperature of 573 K and CuCl content of 30 wt%. Thus synthesized adsorbent exhibited a high CO adsorption capacity of 48.5 cm<SUP>3</SUP> g<SUP>−1</SUP> at 293 K, but a very low CO<SUB>2</SUB> adsorption capacity (2.89 cm<SUP>3</SUP> g<SUP>−1</SUP>), resulting in CO/CO<SUB>2</SUB> separation factor of 16.8. When the CuCl content increased to 36 wt%, the adsorbent exhibited much higher separation factor (35.5), although the CO adsorption capacity was somewhat smaller (41.6 cm<SUP>3</SUP> g<SUP>−1</SUP>). The CO adsorption capacity and CO/CO<SUB>2</SUB> selectivity of this adsorbent are larger than those of our previous CuCl/boehmite adsorbent showing CO adsorption of 34 cm<SUP>3</SUP> g<SUP>−1</SUP> and a CO/CO<SUB>2</SUB> separation factor of 12.4. The present adsorbent also shows very high selectivity for CO over H<SUB>2</SUB>, N<SUB>2</SUB>, and CH<SUB>4</SUB>. Therefore, this adsorbent is expected to show excellent CO separation performance for various industrial processes such as steam-reforming and steel-making which involve CO, CO<SUB>2</SUB>, H<SUB>2</SUB>, N<SUB>2</SUB>, and CH<SUB>4</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly selective CO adsorbent based on CuCl/bayerite composite was synthesized. </LI> <LI> Adsorbent exhibited very high CO/CO<SUB>2</SUB> selectivity. </LI> <LI> High separation ability is attributed to the large surface area of bayerite. </LI> <LI> Thermal treatment conditions for dispersion of CuCl on bayerite were optimized. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Choi, Won-Joon,Cho, Ki-Chul,Lee, Sang-Sup,Shim, Jae-Goo,Hwang, Hye-Ryun,Park, Sang-Wook,Oh, Kwang-Joong Royal Society of Chemistry 2007 GREEN CHEMISTRY Vol.9 No.6
<P>The emissions of anthropogenic carbon dioxide (CO<SUB>2</SUB>) are believed make a significant impact on global climate change. Hence, amine chemical absorption technology has been suggested to separate and recover CO<SUB>2</SUB>. In this study, reaction rate constants between CO<SUB>2</SUB> and blended amines were determined by measuring their absorption rate for CO<SUB>2</SUB>. The experiments were carried out to investigate the characteristics of CO<SUB>2</SUB> absorption by using additional absorbents such as hexamethylenediamine (HMDA), <I>N</I>-methyldiethanolamine (MDEA) or piperazine blended into 2-amino-2-methyl-1-propanol (AMP) in an agitated vessel. The absorption rates of CO<SUB>2</SUB> into aqueous blended amine solutions were measured. Additive concentrations of 1, 3, and 5 wt% were added for each 30 wt% AMP solution. The results showed that the addition of HMDA, MDEA or piperazine into AMP increased the absorption rate as compared to AMP alone. Of these additives, HMDA showed the most enhancement in the reaction rate of AMP. The reaction rate constants of HMDA, MDEA and piperazine blended into AMP at 303–343 K were given by <I>k</I><SUB>H</SUB> = 3.84 × 10<SUP>10</SUP>exp(−5361/<I>T</I>), <I>k</I><SUB>M</SUB> = 6.60 × 10<SUP>9</SUP>exp(−4959/<I>T</I>), and <I>k</I><SUB>P</SUB> = 9.09 × 10<SUP>9</SUP>exp(−5058/<I>T</I>), respectively.</P> <P>Graphic Abstract</P><P>The addition of 1, 3, and 5 wt% HMDA, MDEA or piperazine into 30 wt% AMP increased the absorption rate as compared to AMP alone. The reaction rate constants of HMDA, MDEA and piperazine blended into AMP at 303–343 K were given by <I>k</I><SUB>H</SUB> = 3.84 × 10<SUP>10</SUP> exp(−5361/<I>T</I>), <I>k</I><SUB>M</SUB> = 6.60 × 10<SUP>9</SUP> exp(−4959/<I>T</I>), and <I>k</I><SUB>P</SUB> = 9.09 × 10<SUP>9</SUP> exp(−5058/<I>T</I>), respectively. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b614101c'> </P>
가중나무로부터 식물생장억제물질 glycine betaine의 분리
윤미선(Misun Yun),최정섭(Jung Sup Choi),조남규(NamKyu Cho),한상섭(Sang-sub Han),김성문(Songmun Kim) 한국잡초학회 2021 Weed & Turfgrass Science Vol.10 No.4
가중나무를 2013년 전라북도 전주 인근 야산에서 수집하여 음건한 후 methanol(MeOH)로 추출하고, 감압농축건조한 추출물을 유채(Brassica napus L.)를 대상으로 in vitro에서 seed bioassay를 수행한 결과 식물생장을 50% 억제하는 식물생장억제값(GR50)은 739 μg g<SUP>-1</SUP>이었다. 식물생장을 억제하는 생리활성물질을 분리하기 위하여 MeOH 추출물을 hexane, CH₂Cl₂, EtOAc, butanol, H₂O로 순차분획하고 GR50을 조사한 결과 EtOAc 분획물의 억제효과가 가장 컸으며(561 μg g<SUP>-1</SUP>), EtOAc 분획물을 thin layer chromatography와 column chromatography로 5개의 분리물로 분리하고, 식물생장억제효과를 검정한 결과 EAC 분획물이 가장 높은 억제효과를 나타냈다(GR50 50 μg g<SUP>-1</SUP>). EAC 분리물을 gas chromatograph mass spectrometry로 분석한 결과 molecular ion (M+)이 m/z 117이고 fragmentaion은 m/z 116, 100, 72, 58이었다. EAC 분리물의 ¹H-NMR(nuclear magnetic resonance)분석결과 δ (ppm)에서 3.30 (9H, d, H-2, 3, 4), 3.85 (2H, s, H-1)에서 proteon signal을 확인하였으며, <SUP>13</SUP>C-NMR 분석결과 δ (ppm)은 52.39 (C-3, 3", 3""), 65.86 (C-2), 167.32 (C-1)에서 carbon signal을 확인하였다. GCMS, ¹H-NMR, <SUP>13</SUP>C-NMR의 분석결과 가중나무 EAC 분리물의 화학명은 1-carboxy-N,N,N-trimethyl이고, 일반명은 glycine betaine으로 확인되었다. Glycien betaie 화합물을 구입하여 유채(Brassica napus L.)를 대상으로 in vitro에서 seed bioassay를 수행한 결과 GR50값은 91 μg g<SUP>-1</SUP>으로 EAC 분리물의 GR50값과 유사하였다. Objective of this study is to discover new herbicide parent mother compound(s) from native plants in Korea. The leaves of Ailanthus altissima Swingle were collected in Jeonju, Jeollabukdo in 1995. The shade dried and powdered plant samples were extracted with methanol (MeOH). The methanol extract of A. altissima was subjected to in vitro seed bioassay on rapeseed (Brassica napus L.). The results indicated that the methanol extract significantly inhibited the germination of rapeseed with the GR50 (growth retardation 50%) value of 739 μg g<SUP>-1</SUP>. In order to isolate the bioactive substances that inhibit plant growth, the MeOH extract was sequentially fractionated with hexane, dichloromethane, ethyl acetate, butanol, and H₂O. Among them, the EtOAc fraction showed the lowest GR50 value (561 μg g<SUP>-1</SUP>) than other fractions. The EtOAc fraction was further fractionated on column chromatography, which showed 5 fractions (EAA-EAE) with good plant growth inhibitory effect. In these, the EAC fraction showed the highest inhibitory effect (GR50 at 50 μg g<SUP>-1</SUP>). The gas chromatography and mass spectrometry analysis of EAC fraction revealed that molecular ion (M<SUP>+</SUP>) was m/z 117 and fragment ions were m/z 116, 100, 72, and 58. Based on the results obtained from GC-MS, ¹H-NMR, and <SUP>13</SUP>C-NMR analyses, the EAC fraction was identified as 1-carboxy-N,N,N-trimethyl, and its common name was glycine betaine. The seed bioassay of glycine betain results revealed that the GR50 value was 91 μg g<SUP>-1</SUP>, which was comparable with the GR50 value of the EAC fraction of A. altissima.
Assessment of groundwater quality using statistical analysis in Incheon - focused on Gangwha area -
Hee-jong Yoo(유희종),Young-min Cho(조영민),Hye-rin Cho(조혜린),Sung-eun Min(민성은),Ji-hong Seong(성지홍),Hyun-sup Ha(하현섭),Mun-ju Kwon(권문주) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Naturally occurring radioactive materials (NORM) is widely distributed in groundwater of granite areas. Drinking of groundwater containing NORM such as uranium and radon is highly harmful to human health. The aim of this study is to determine the characteristics of groundwater quality with NORM and geostatistical analysis. Groundwater samples from 37 wells were collected and measured on 24 items of drinking water quality standards including radon and uranium in 2020. The average concentrations of uranium and radon in groundwater were the highest in granite area. Principal component analysis (PCA) showed that PC1 was highly enriched with Na<sup>+</sup>, K<SUP>+</SUP>, Mg<sup>2+</sup>, Ca<sup>2+</sup>, Cl<sup>-</sup>, SO<sub>4</sub><sup>2-</sup>, NO<sub>3</sub><sup>-</sup>, HCO<sub>3</sub><sup>-</sup> and Sr (40.6 %) strongly associated with soluble ion materials. Both PC2 with F<sup>-</sup>, U and Gross alpha (20.3 %) and PC3 with Rn (8.5 %) was related to NORM. PC4 was enriched with Zn (7.0 %). Cluster analysis (CA) revealed three subgroups showing high relationship between Na<sup>+</sup> and Cl<sup>-</sup> of main soluble ion constituents in seawater. This study coupled with statistical analysis is expected to imply appropriate contamination control management for safety of drinking groundwater.
폴리비닐클로라이드 해양광생물반응기와 고밀도 폴리에틸렌 해양광생물반응기에서 미세조류, Tetraselmis sp. KCTC12236BP의 생산성 비교
정성균(Seung-Gyun Jung),김수권(Su-Kwon Kim),변문섭(Moon-Sup Bun),조용희(Yonghee Cho),신동우(Dong-Woo Shin),김지훈(Z-Hun Kim),임상민(Sang-Min Lim),이철균(Choul-Gyun Lee) 한국해양바이오학회 2016 한국해양바이오학회지 Vol.8 No.1
It is important to design photobioreactor by cheap material for economical microalgal biomass production. In this study, two types of marine photobioreactors (MPBR), made by either polyvinyl chloride (MPBR-PVC) or high density poly ethylene (MPBR-HDPE), are used and performance of these were compared. Tetraselmis sp. KCTC 12236BP is a green marine alga that isolated from Ganghwa Island, Korea, and the strain was used for marine cultivations using MPBR-PVC and MPBR-HDPE. The cultivations were performed three times in the spring season of 2012 using MPBR-PVC and of 2013 using MPBR-HDPE in the coastal area of Young Heung Island. As the results, MPBR-PVC shows higher biomass productivities than MPBR-HDPE, due to its high light transmittance. In the cultivations using MPBR-PVC, the average sea water temperature was 11.5°C during the first experiment and 16.5°C during the second and third experiments. Average light intensities during three times for experiments were 407.5, 268.1 and 273.0 μ·E·m<SUP>-2</SUP>·s<SUP>-1</SUP>, respectively. The maximum fresh cell weight and average biomass productivity were 1.2 g·L<SUP>-1</SUP> and 0.12 g·L<SUP>-1</SUP>·day<SUP>-1</SUP>. These results showed that Tetraselmis sp. KCTC12236BP were adapted well with the environmental conditions from ocean, and grow in the MPBR-PVC and MPBR-HDPE.
Cloning and Expression of Alkaline Phosphatase Gene from Schizosaccharomyces pombe
Cho, Young Wook,Park, Eun Hee,Lim, Chang Jin,Ahn, Ki Sup,Kang, Sung Won 생화학분자생물학회 1970 BMB Reports Vol.34 No.3
A cDNA coding alkaline phosphatase (AP) homologue was isolated from a cDNA library of Schizosaccharomyces pombe by colony hybridization. The nucleotide sequence of the cloned cDNA appeared to lack the N-terminal coding region. The genomic DNA encoding alkaVne phosphatase homologue was isolated from S. pombe chromosomal DNA using PCR. The ampVfied DNA fragment was ligated into plasmid pRS315 to generate the recombinant plasmid pSW20. The DNA insert was subcloned as two smaller fragments for nucleotide sequencing. The sequence contains 2,789 by and encodes a protein of 532 amino acids with a molecular mass of 58,666 daltons. The S. pombe cells containing plasmid pSW20 showed much higher AP activity compared with the yeast cells with vector only This indicates that the cloned AP gene apparently encodes AP The predicted amino acid sequence of the S. pombe AP shares homology with those of other known APs.
Model - Free Interval Prediction in a Class of Time Series with Varying Coefficients
Sang Woo Park,Sin Sup Cho,Sang Yeol Lee,Sun Y . Hwang 한국데이터정보과학회 2000 한국데이터정보과학회지 Vol.11 No.2
Interval prediction based on the empirical distribution function for the class of time series with time varying coefficients is discussed. To this end, strong mixing property of the model is shown and results due to Fotopoulos et. al.(1994) are employed. A simulation study is presented to assess the accuracy of the proposed interval predictor.