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Adsorptive removal of atmospheric pollutants over Pyropia tenera chars
Heejin Lee,Rae-su Park,Hyung Won Lee,Yeojin Hong,Yejin Lee,Sung Hoon Park,Sang-Chul Jung,Kyung-Seun Yoo,Jong-Ki Jeon,Young-Kwon Park 한국탄소학회 2016 Carbon Letters Vol.19 No.-
As a replacement for activated carbon, biochar was synthesized and used for the adsorptive removal of formaldehyde and nitrogen oxide. Biochar was produced from the fast pyrolysis of the red marine macro alga, Pyropia tenera. The P. tenera char was then activated with steam, ammonia and KOH to alter its characteristics. The adsorption of formaldehyde, which is one of the main indoor air pollutants, onto the seaweed char was performed using 1-ppm formaldehyde and the char was activated using a range of methods. The char activated with both the KOH and ammonia treatments showed the highest adsorptive removal efficiency, followed by KOH-treated char, ammonia-treated char, steam-treated char, and non-activated char. The removal of 1000-ppm NO over untreated char, KOH-treated char, and activated carbon was also tested. While the untreated char exhibited little activity, the KOH-treated char removed 80% of the NO at 50°C, which was an even higher NO removal efficiency than that achieved by activated carbon.
A Long Non-Coding RNA snaR Contributes to 5-Fluorouracil Resistance in Human Colon Cancer Cells
Lee, Heejin,Kim, Chongtae,Ku, Ja-Lok,Kim, Wook,Kim Yoon, Sungjoo,Kuh, Hyo-Jeong,Lee, Jeong-Hwa,Nam, Suk Woo,Lee, Eun Kyung Korean Society for Molecular and Cellular Biology 2014 Molecules and cells Vol.37 No.7
Several types of genetic and epigenetic regulation have been implicated in the development of drug resistance, one significant challenge for cancer therapy. Although changes in the expression of non-coding RNA are also responsible for drug resistance, the specific identities and roles of them remain to be elucidated. Long non-coding RNAs (lncRNAs) are a type of ncRNA (> 200 nt) that influence the regulation of gene expression in various ways. In this study, we aimed to identify differentially expressed lncRNAs in 5-fluorouracil-resistant colon cancer cells. Using two pairs of 5-FU-resistant cells derived from the human colon cancer cell lines SNU-C4 and SNU-C5, we analyzed the expression of 90 lncRNAs by qPCR-based profiling and found that 19 and 23 lncRNAs were differentially expressed in SNU-C4R and SNU-C5R cells, respectively. We confirmed that snaR and BACE1AS were down-regulated in resistant cells. To further investigate the effects of snaR on cell growth, cell viability and cell cycle were analyzed after transfection of siRNAs targeting snaR. Down-regulation of snaR decreased cell death after 5-FU treatment, which indicates that snaR loss decreases in vitro sensitivity to 5-FU. Our results provide an important insight into the involvement of lncRNAs in 5-FU resistance in colon cancer cells.
Lee, Heejin,Joo, Ho-yong,Yoon, Chulmin,Lee, Joonbong,Lee, Hojin,Choi, Jinsik,Park, Baeho,Choi, Taekjib Elsevier 2017 Current Applied Physics Vol.17 No.5
<P>Ferroelectric based heterostructures have shown great promises in solar water splitting due to unique photoelectrochemical (PEC) properties including polarization-induced charge separation and tunable electrochemical surface reaction. A highly ordered ferroelectric BiFeO3/TiO2 nanotube (TNT) heterostructures were fabricated by anodic oxidation and pulsed laser deposition. The microscopic morphology, optical, and PEC properties of nanostructures were characterized. The BiFeO3/TNT photoelectrode is photoactive under visible light illumination, which exhibits higher photocurrent from greater water oxidation, compared with the pure TNT photoelectrode. The coating thickness of BiFeO3 strongly affected the photoelectrochemical properties. The enhanced PEC performance could be attributed to the effective charge separation and the favorable band bending for water oxidation, originating from ferroelectric polarization-related internal field. (C) 2017 Elsevier B.V. All rights reserved.</P>
Joohyeong Lee,Eunmi Kim,Min-Kyung Kang,Jihye Ryu,Ji Eon Kim,Eun-Ae Shin,Yangie Pinanga,Kyung-hee Pyo,Haesong Lee,Eun Hae Lee,Heejin Cho,Jayeon Cheon,Wonsik Kim,Eek-hoon Jho,Semi Kim,Jung Weon Lee 생화학분자생물학회 2022 BMB Reports Vol.55 No.12
Mutation of the gene for adenomatous polyposis coli (APC), asseen in ApcMin/+ mice, leads to intestinal adenomas and carcinomasvia stabilization of β-catenin. Transmembrane 4 L sixfamily member 5 (TM4SF5) is involved in the development ofnon-alcoholic fatty liver disease, fibrosis, and cancer. However,the functional linkage between TM4SF5 and APC or β-cateninhas not been investigated for pathological outcomes. After interbreedingApcMin/+ with TM4SF5-overexpressing transgenic(TgTM4SF5) mice, we explored pathological outcomes in the intestinesand livers of the offspring. The intestines of 26-week-olddual-transgenic mice (ApcMin/+:TgTM4SF5) had intramucosal adenocarcinomasbeyond the single-crypt adenomas in ApcMin/+ mice. Additional TM4SF5 overexpression increased the stabilizationof β-catenin via reduced glycogen synthase kinase 3β (GSK3β)phosphorylation on Ser9. Additionally, the livers of the dualtransgenicmice showed distinct sinusoidal dilatation and featuresof hepatic portal hypertension associated with fibrosis,more than did the relatively normal livers in ApcMin/+ mice. Interestingly, TM4SF5 overexpression in the liver was positivelylinked to increased GSK3β phosphorylation (opposite to thatseen in the colon), β-catenin level, and extracellular matrix (ECM)protein expression, indicating fibrotic phenotypes. Consistentwith these results, 78-week-old TgTM4SF5 mice similarly had sinusoidaldilatation, immune cell infiltration, and fibrosis. Altogether,systemic overexpression of TM4SF5 aggravates pathologicalabnormalities in both the colon and the liver.
SeongSu Lee,JeongSeok Seo,SungRae Kim,JoEun Jeong,BeomWoo Nam,JuYul Lee,HeeJin Lee,Chul Lee,ChangUk Lee,InHo Paik,JeongHo Chae,SookHee Chai,SoonJib Yoo,WangYoun Won,DaiJin Kim 대한신경정신의학회 2011 PSYCHIATRY INVESTIGATION Vol.8 No.2
Objective-Our aim was to evaluate the changes in blood glucose control and lipid profiles after 2-months of smoking cessation in healthy males. Methods-Smoking abstinence was evaluated through self-report and urine cotinine levels. 12 individuals who succeeded in quitting smoking were analyzed. Fasting values of glucose and insulin were used to estimate the β-cell activity and insulin resistance was evaluated using the Homeostasis Model Assessment (HOMA) and Quantitative Insulin Sensitivity Check Index (QUICKI). Results-The data showed that the subjects had a significant increase in weight, body mass index and fasting plasma glucose levels after smoking cessation. The HOMA-Insulin Resistance and the HOMA β-cell function increased significantly (p=0.005, p=0.047 respectively). The QUICKI showed a significant decrease (p=0.005). In addition, the low-density lipoprotein cholesterol levels decreased significantly (p=0.028); however, changes in the high-density lipoprotein cholesterol, the triglyceride and total cholesterol levels were not significant (p=0.284, p=0.445 respectively). Conclusion-During the initial stage of smoking abstinence, insulin resistance increased and insulin sensitivity decreased due to elevated body weight and fat composition. Therefore, it is important to educate individuals that stop smoking about the necessity of weight control during smoking cessation programs.