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RISS 인기검색어
- 검색키워드
- 저자 : Bang-Ying Yu (검색결과 5 건)
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Study of processing adsorption mechanism of amphoteric polyelectrolyte in BaTiO3 colloids suspension
Wen-Cheng J. Wei,Bang-Ying Yu,Kung-Chung Hsu 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.2
An amphoteric dispersant, copolymer (α-N,N-dimethyl-N-acryloyloxyethyl) ammonium ethanateacrylamide (PAAM/DAAE), was used for the dispersion of BaTiO3 (BT) colloids in an aqueous solution, and compared to a commercial acrylic- based polymeric dispersant, ammonium salt of polymethylacrylic acid (PMAA-NH4). Several properties, including surface potential, sedimentation height ratio, green density, and Ba2+ dissolution from the particle surface were studied. Due to the branch structure of PAAM/DAAE and more importantly the amphoteric functional groups of PAAM/DAAE, the macromolecules adsorbed on BT in much higher concentration (up to 7 mg/g) and limited the dissolution of Ba2+ ions from the BT surface. Strong steric repulsion between BT particles with PAAM/DAAE resulted in a good dispersion of fine particles and greater packing density in the green state than that of PMAA-NH4. The adsorption mechanism and interactions among BT, dispersants, and H2O are reported.
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Colloidal processing of Pb(Zr,Ti)O3, Part I-Pb dissolution
Wen-Cheng J. Wei,Wen-Ting Hsu,Bang-Ying Yu 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.3
The dissolution behavior of aqueous Pb(Zr,Ti) O3(PZT) suspensions were studied by Atomic Adsorption (AA) and Inductively Coupling Plasma (ICP) spectroscopies, specially emphasizing the change of solution acidity within pH 2 to 12, the effects of polymeric dispersant, and comparing with the dissolution behavior of PbO. The iso-electric-point (IEP) of a 2.0 wt % PZT solution was measured and compared to the minimal dissolution case (less than 10 ppm) to be in the range of pH 7 to 10. The effects of one dispersants, poly (α-N,N-dimethyl-N-acryloxyethyl) ammonium ethnate acrylamide (PMAA/DAAE) was investigated in comparison with a commercial anionic dispersant, an ammonium salt of polymethylacrylic acid (PMAAN). A possible dissolution model and the thickness of the Pb depletion zone on PZT particles are proposed based on the experimental observation. The dissolution behavior of aqueous Pb(Zr,Ti) O3(PZT) suspensions were studied by Atomic Adsorption (AA) and Inductively Coupling Plasma (ICP) spectroscopies, specially emphasizing the change of solution acidity within pH 2 to 12, the effects of polymeric dispersant, and comparing with the dissolution behavior of PbO. The iso-electric-point (IEP) of a 2.0 wt % PZT solution was measured and compared to the minimal dissolution case (less than 10 ppm) to be in the range of pH 7 to 10. The effects of one dispersants, poly (α-N,N-dimethyl-N-acryloxyethyl) ammonium ethnate acrylamide (PMAA/DAAE) was investigated in comparison with a commercial anionic dispersant, an ammonium salt of polymethylacrylic acid (PMAAN). A possible dissolution model and the thickness of the Pb depletion zone on PZT particles are proposed based on the experimental observation.
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Extremely low‐frequency magnetic fields modulate nitric oxide signaling in rat brain
Cho, Sung In,Nam, Yun Sung,Chu, Li Ying,Lee, Jong Hyuk,Bang, Joon Seok,Kim, Hye Ryoun,Kim, Hyoung‐,Chun,Lee, Yu Jeung,Kim, Hyeong‐,Dong,Sul, Jung Duk,Kim, Daejin,Chung, Yoon Hee,Jeong, Ji Wiley Subscription Services, Inc., A Wiley Company 2012 BioElectroMagnetics Vol.33 No.7
<P><B>Abstract</B></P><P>Our previous study has shown that an extremely low‐frequency magnetic field (ELF‐MF) induces nitric oxide (NO) synthesis by Ca<SUP>2+</SUP>‐dependent NO synthase (NOS) in rat brain. The present study was designed to confirm that ELF‐MF affects neuronal NOS (nNOS) in several brain regions and to investigate the correlation between NO and nNOS activation. The exposure of rats to a 2 mT, 60 Hz ELF‐MF for 5 days resulted in increases of NO levels in parallel with cGMP elevations in the cerebral cortex, striatum, and hippocampus. Cresyl violet staining and electron microscopic evaluation revealed that there were no significant differences in the morphology and number of neurons in the cerebral cortex, striatum, and hippocampus. Differently, the numbers of nNOS‐immunoreactive (IR) neurons were significantly increased in those cerebral areas in ELF‐MF‐exposed rats. These data suggest that the increase in NO could be due to the increased expression and activation of nNOS in cells. Based on NO signaling in physiological and pathological states, ELF‐MF created by electric power systems may induce various physiological changes in modern life. Bioelectromagnetics 33:568–574, 2012. © 2012 Wiley Periodicals, Inc.</P>
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Impact of Interleukin-10 Gene Polymorphisms on Survival in Patients with Colorectal Cancer
Wen-Chien Ting,Lu-Min Chen,Li-Chia Huang,Mann-Jen Hour,Yu-Hsuan Lan,Hong-Zin Lee,Bang-Jau You,Ta-Yuan Chang,Bo-Ying Bao 대한의학회 2013 Journal of Korean medical science Vol.28 No.9
Chronic inflammation is thought to be the leading cause of colorectal cancer, and interleukin-10 (IL10) has been identified as a potent immunomodulatory cytokine that regulates inflammatory responses in the gastrointestinal tract. Although several single nucleotide polymorphisms (SNPs) in IL10 have been associated with the risk of colorectal cancer, their prognostic significance has not been determined. Two hundred and eightytwo colorectal cancer patients were genotyped for two candidate cancer-associated SNPs in IL10. The associations of these SNPs with distant metastasis-free survival and overall survival were evaluated by Kaplan-Meier analysis and Cox regression model. The minor homozygote GG genotype of IL10 rs3021094 was significantly associated with a 3.30-fold higher risk of death compared with the TT+TG genotypes (P = 0.011). The patients with IL10rs3021094 GG genotype also had a poorer overall survival in Kaplan-Meier analysis (log-rank P = 0.007) and in multivariate Cox regression model (P = 0.044) adjusting for age, gender,carcinoembryonic antigen levels, tumor differentiation, stage, lymphovascular invasion,and perineural invasion. In conclusion, our results suggest that IL10 rs3021094 might be a valuable prognostic biomarker for colorectal cancer patients.
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Regulation of PDGF signalling and vascular remodelling by peroxiredoxin II
Choi, Min Hee,Lee, In Kyung,Kim, Gyung Whan,Kim, Bang Ul,Han, Ying-Hao,Yu, Dae-Yeul,Park, Hye Sun,Kim, Kyung Yong,Lee, Jong Seo,Choi, Chulhee,Bae, Yun Soo,Lee, Byung In,Rhee, Sue Goo,Kang, Sang Won Nature Publishing Group 2005 Nature Vol.435 No.7040
Platelet-derived growth factor (PDGF) is a potent mitogenic and migratory factor that regulates the tyrosine phosphorylation of a variety of signalling proteins via intracellular production of H<SUB>2</SUB>O<SUB>2</SUB> (refs 1, 2–3). Mammalian 2-Cys peroxiredoxin type II (Prx II; gene symbol Prdx2) is a cellular peroxidase that eliminates endogenous H<SUB>2</SUB>O<SUB>2</SUB> produced in response to growth factors such as PDGF and epidermal growth factor; however, its involvement in growth factor signalling is largely unknown. Here we show that Prx II is a negative regulator of PDGF signalling. Prx II deficiency results in increased production of H<SUB>2</SUB>O<SUB>2</SUB>, enhanced activation of PDGF receptor (PDGFR) and phospholipase Cγ1, and subsequently increased cell proliferation and migration in response to PDGF. These responses are suppressed by expression of wild-type Prx II, but not an inactive mutant. Notably, Prx II is recruited to PDGFR upon PDGF stimulation, and suppresses protein tyrosine phosphatase inactivation. Prx II also leads to the suppression of PDGFR activation in primary culture and a murine restenosis model, including PDGF-dependent neointimal thickening of vascular smooth muscle cells. These results demonstrate a localized role for endogenous H<SUB>2</SUB>O<SUB>2</SUB> in PDGF signalling, and indicate a biological function of Prx II in cardiovascular disease.
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