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Lee, Woo Ram,Hwang, Sang Yeon,Ryu, Dae Won,Lim, Kwang Soo,Han, Sang Soo,Moon, Dohyun,Choi, Jungkyu,Hong, Chang Seop The Royal Society of Chemistry 2014 Energy & environmental science Vol.7 No.2
<P>A framework en-Mg<SUB>2</SUB>(dobpdc) (<B>1-en</B>; en = ethylenediamine) functionalized with the primary amine en was prepared <I>via</I> postmodification. From synchrotron PXRD data, it is revealed that the cell parameters change upon grafting of en and CO<SUB>2</SUB> uptake. The adsorbed CO<SUB>2</SUB> amount of <B>1-en</B> is 4.57 mmol g<SUP>−1</SUP> (16.7 wt%) at 25 °C and 1 bar and decreases to 3.00 mmol g<SUP>−1</SUP> (11.7 wt%) at 150 °C. Noticeably, <B>1-en</B> shows a significant CO<SUB>2</SUB> uptake (3.62 mmol g<SUP>−1</SUP>, 13.7 wt%) at 0.15 bar, which is comparable to the CO<SUB>2</SUB> partial pressure of a post-combustion flue gas. The CO<SUB>2</SUB> capacity of <B>1-en</B> at 0.39 mbar, close to atmospheric CO<SUB>2</SUB> concentration, is 2.83 mmol g<SUP>−1</SUP> (11.1 wt%), which marks the highest amount among MOFs. The isosteric heat of adsorption (−<I>Q</I><SUB>st</SUB>) of <B>1-en</B> in CO<SUB>2</SUB> capture corresponds to 49–51 kJ mol<SUP>−1</SUP>, which is supported by DFT calculations (−52.8 kJ mol<SUP>−1</SUP>). These results suggest that the adsorption of CO<SUB>2</SUB> onto the free amines of en leads to the formation of a carbamic acid. Adsorption–desorption cyclings of CO<SUB>2</SUB> at the real dilute concentrations of air and flue gas are established with almost retaining CO<SUB>2</SUB> capacities, which could provide superior potential for practical application in CO<SUB>2</SUB> capture. The adsorption rate of CO<SUB>2</SUB> in <B>1-en</B> exceeds that in some other tested porous materials. The recyclability in CO<SUB>2</SUB> uptake for <B>1-en</B> is maintained even after exposure to humidity.</P> <P>Graphic Abstract</P><P>A framework en-Mg<SUB>2</SUB>(dobpdc) functionalized with ethylenediamine exhibits a record high CO<SUB>2</SUB> capacity from air (0.39 mbar) with potential for application in CO<SUB>2</SUB> capture. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3ee42328j'> </P>
Exceptional CO <sub>2</sub> working capacity in a heterodiamine-grafted metal–organic framework
Lee, Woo Ram,Jo, Hyuna,Yang, Li-Ming,Lee, Hanyeong,Ryu, Dae Won,Lim, Kwang Soo,Song, Jeong Hwa,Min, Da Young,Han, Sang Soo,Seo, Jeong Gil,Park, Yong Ki,Moon, Dohyun,Hong, Chang Seop Royal Society of Chemistry 2015 Chemical Science Vol.6 No.7
<▼1><P>The amine functionalized material <B>1-dmen</B> shows a record high working capacity for CO<SUB>2</SUB> capture at low regeneration temperatures compared with other MOFs. Furthermore, this performance is maintained upon exposure to humidity.</P></▼1><▼2><P>An amine-functionalized metal–organic framework (MOF), dmen-Mg<SUB>2</SUB>(dobpdc) (dmen = <I>N</I>,<I>N</I>-dimethylethylenediamine), which contains a heterodiamine with both primary and tertiary amines, was prepared <I>via</I> a post-synthetic method. This material exhibits a significant selectivity factor for CO<SUB>2</SUB> over N<SUB>2</SUB> that is commensurate with top-performing MOFs. It is remarkable that the solid is fully regenerated under vacuum or flowing Ar at low desorption temperatures, and following this can take up CO<SUB>2</SUB> at more than 13 wt%. An exceptionally high working capacity is achieved at low regeneration temperatures and after exposure to humid conditions, which are important parameters for a real post-combustion CO<SUB>2</SUB> capture process.</P></▼2>
A. Ram Lee,문동규,Adrian Siregar,Sun Young Moon,Ryoung‑Hoon Jeon,Young‑Bum Son,Bo Gyu Kim,Young‑Sool Hah,Sun‑Chul Hwang,June‑Ho Byun,Dong Kyun Woo 대한약학회 2019 Archives of Pharmacal Research Vol.42 No.12
Due to a rapidly expanding aging population,the incidence of age-related or degenerative diseases hasincreased, and efforts to handle the issue with regenerativemedicine via adult stem cells have become more important. And it is now clear that the mitochondrial energy metabolismis important for stem cell differentiation. When stemcells commit to differentiate, glycolytic metabolism isbeing shifted to mitochondrial oxidative phosphorylation(OXPHOS) to meet an increased cellular energy demandrequired for differentiated cells. However, the nature ofcellular metabolisms during the differentiation process ofperiosteum-derived mesenchymal stem cells (POMSC) isstill unclear. In the present study, we investigated mitochondrialbiogenesis during the adipogenic, chondrogenic, and osteogenic differentiation of POMSCs. Both mitochondrialDNA (mtDNA) contents and mitochondrial proteins (VDACand mitochondrial OXPHOS complex subunits) wereincreased during all of these mesenchymal lineage differentiationsof POMSCs. Interestingly, glycolytic metabolismis reduced as POMSCs undergo osteogenic differentiation. Furthermore, reducing mtDNA contents by ethidium bromidetreatments prevents osteogenic differentiation of POMSCs. In conclusion, these results indicate that mitochondrialbiogenesis and OXPHOS metabolism play important roles inthe differentiation of POMCS and suggest that pharmaceuticalmodulation of mitochondrial biogenesis and/or functioncan be a novel regulation for POMSC differentiation andregenerative medicine.
효모추출복합물과 헛개나무 열매추출 복합물이 알코올 대사에 미치는 영향 -무작위, 이중맹검, 위약 대조군, 교차 인체적용시험-
조보람 ( Bo-ram Cho ),남충우 ( Choong-woo Nam ),정세영 ( Se-young Choung ),정인경 ( In-kyung Jeong ),문민선 ( Min-sun Moon ) 한국식품영양학회 2017 韓國食品營養學會誌 Vol.30 No.4
This study was conducted to investigate if the supplement formula may improve alcohol metabolism in healthy adult men. In a double-blinded, randomized, crossover study, subjects were administrated yeast extract mixtures (YEM, n=15), Hovenia dulcis mixtures (HDM, n=15), placebo (PLA, n=15), and control (CON, n=15) in an oral dose followed by one week washout periods. At each visit (0, 1, 2, 3, 4 week), subjects drank 450 mL, 20.1 percent alcohol after administered mixtures. Blood was drawn periodically (0, 0.25, 0.5, 1, 2, 4, 6, 15 hours). Fifteen subjects completed the protocol and were included in the analysis. Plasma ethanol concentration was lower in YEM (10 percent) and the HDM (5 percent) groups. The area under the curves (AUC) and Cmax for plasma ethanol were significantly decreased only in the YEM group, when compared with the CON group. The AUC and Cmax for plasma acetaldehyde concentration were significantly decreased in the YEM (45 and 54 percent) and the HDM (35 and 53 percent) groups respectively, when compared with PLA (p<0.01). Together, these findings validate that YEM or HDM improved alcohol metabolism and hangover syndromes, leading to reduce alcohol concentration and acetaldehyde concentration without adverse effects.