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수용성 Polymer-metal Complex의 형성과 중합 개시제로서의 활용성에 관한 연구(Ⅰ)
맹기석,송해영,권오승,황명천,황택성 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(B)
The formation of Water-Soluble Poly(Methacrylic acid) (PMA) and poly (acrylamide) (PAAm)-Cu(II) complexes was achieved at various PH. The structures and the optimum conditions for the formation of complexes have been determined through UV, IR and viscosity measurements. In addition, it was found that they can be used as an initiator for vinyl type monomers. Formed polymer-metal complexes are the most stable at around PH=7 and therefore give rise to maximum absorbance in UV spectrum. As PH is increased the conformation of polymer-metal complexes has become more compact. This can be explained in terms of decreasing viscosity with increasing PH. It was also observed that the function as an initiator of the polymer-metal complexes is very active at around PH=7 and the complexes can polymerize vinyl type monomers up to 10% Conversion. These results can explain the fact that the stable complexes were formed at around PH=7 and the formed complexes can be used as good initiators.
수용성 Polymer-metal Complex의 형성과 중합 개시제로서의 활용성에 관한 연구(Ⅱ)
맹기석,송해영,황명천,황택성 충남대학교 공업교육연구소 1985 論文集 Vol.8 No.1
The optimum conditions for the formation of PAAm-Cu(Ⅱ) and PMA-Cu(Ⅱ) complexes have been determined through thermal analyzing and scanning electron microscope measurements. In addition, it was found that they can be used as an initiator for methylmethacrylate(MMA) and styrene vinyl type monomers and as a catalyst of alkylation. Water-soluble PMA-Cu(Ⅱ) complex had the first endothermic reaction around 380℃ and endothermic reaction around 400℃, respectively and then the secondary exothermic reaction only was observed around 450℃. As pH is increased the formation of water soluble PMA-Cu(II) complex has become more compact. It was also observed that the function as catalyst of alkylation and an initiator of the water-soluble PMA-Cu(Ⅱ) complex is very active at around pH7 and the complex can polymerize MMA and styrene monomer up to 9% and 8% conversion. These results can explain the fact that formed complex can be used as good initiator and catalyst.
Hwang, In Koo,Park, Joon Ha,Lee, Tae-Kyeong,Kim, Dae Won,Yoo, Ki-Yeon,Ahn, Ji Hyeon,Kim, Yang Hee,Cho, Jun Hwi,Kim, Young-Myeong,Won, Moo-Ho,Moon, Seung Myung SPANDIDOS PUBLICATIONS 2017 MOLECULAR MEDICINE REPORTS Vol.15 No.6
<P>Activated M1 microglia secrete proinflammatory cytokines into damaged brain areas. The present study examined activated M1 microglial morphology and expression in the hippocampal Cornu Ammonis (CA) 1 region, which is vulnerable to transient ischemia. Transient cerebral ischemia was performed for 5 min in gerbils, and neuronal death in the CA1 region following transient cerebral ischemia was confirmed using cresyl violet staining, neuronal nuclear antigen immunohistochemistry and Fluoro-Jade B histofluorescent staining. In addition, CA1 regions were stained for cluster of differentiation (CD) 74, a marker for activated M1 microglia and a ligand for macrophage migration inhibitory factor In sham-operated animals, no CD74 immunoreactivity was observed in the hippocampal CA1 region. CD74 immunoreactivity was not observed in the hippocampal CA1 region until 3 days post-ischemic insult; however, elevated CD74 immunoreactivity was detected in the CA1 region from 5 days post-ischemia. Double immunofluorescence staining for CD74 and ionized calcium-binding adapter molecule 1, a marker for M1 microglial cells, confirmed the expression of CD74 on this microglial subtype. These results indicated that M1 microglia are activated late in the hippocampal CA1 region following ischemic stroke. Therefore, optimizing the timing of therapeutic intervention may reduce activated M1 microglial-induced neuronal damage.</P>
Hwang, In Koo,Yoo, Ki-Yeon,An, Sung-Jin,Li, Hua,Lee, Choong Hyun,Choi, Jung Hoon,Lee, Jae-Yong,Lee, Bong-Hee,Kim, Young-Myeong,Kwon, Young-Guen,Won, Moo-Ho Elsevier 2008 Experimental neurology Vol.212 No.2
<P><B>Abstract</B></P><P>Although acidosis may be involved in neuronal death, the participation of Na<SUP>+</SUP>/H<SUP>+</SUP> exchanger (NHE) in delayed neuronal death in the hippocampal CA1 region induced by transient forebrain ischemia has not been well established. In the present study, we investigated the chronological alterations of NHE1 in the hippocampal CA1 region using a gerbil model after ischemia/reperfusion. In the sham-operated group, NHE1 immunoreactivity was weakly detected in the CA1 region. Two and 3?days after ischemia/reperfusion, NHE1 immunoreactivity was observed in glial components, not in neurons, in the CA1 region. Four days after ischemia/reperfusion, NHE1 immunoreactivity was markedly increased in CA1 pyramidal neurons as well as glial cells. These glial cells were identified as astrocytes based on double immunofluorescence staining. Western blot analysis also showed that NHE protein level in the CA1 region began to increase 2?days after ischemia/reperfusion. The treatment of 10?mg/kg 5-(<I>N</I>-ethyl-<I>N</I>-isopropyl) amiloride, a NHE inhibitor, significantly reduced the ischemia-induced hyperactivity 1day after ischemia/reperfusion. In addition, NHE inhibitor potently protected CA1 pyramidal neurons from ischemic damage, and NHE inhibitor attenuated the activation of astrocytes and microglia in the ischemic CA1 region. In addition, NHE inhibitor treatment blocked Na<SUP>+</SUP>/Ca<SUP>2+</SUP> exchanger 1 immunoreactivity in the CA1 region after transient forebrain ischemia. These results suggest that NHE1 may play a role in the delayed death, and the treatment with NHE inhibitor protects neurons from ischemic damage.</P>
Hwang, Min Woo,Ahn, Tae Seok,Hong, Noo Ri,Jeong, Han-Sol,Jung, Myeong Ho,Ha, Ki-Tae,Kim, Byung Joo WJG Press 2015 WORLD JOURNAL OF GASTROENTEROLOGY Vol.21 No.4
<P>To investigate the effects of San-Huang-Xie-Xin-Tang (SHXXT), a herbal product used in traditional Chinese medicine, on gastrointestinal (GI) motility in mice.</P>
무전해 은도금된 활성탄소섬유필터의 바이오에어로졸 저감 특성
윤기영(Ki-Young Yoon),변정훈(Jeong-Hoon Byeon),고병주(Byung-Ju Ko),박재홍(Jae-Hong Park),김명운(Myeong-Woon Kim),윤희승(Hee-Seung Yoon),황정호(Jung-Ho Hwang) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.2
Bioaerosols are airborne particles of biological origins including viruses, bacteria, fungi, and all varieties of living materials. In suitable hosts, bioaerosols are capable of causing acute or chornic diseases that may be infectious, allergenic, or toxigenic. Bioaerosols from outdoor air accumulate on filters of heating, ventilating and air conditioning (HVAC) system in large quantities and are able to multiply there under certain conditions. In this study, silver was coated on activated carbon fiber (ACF) filters by an electroless plating method, and their efficacy for bioaerosols removal was tested. Physical filtration and biological antimicrobial test were performed. SEM and XRD analyses were used to characterize the morphology and components of ACF filters. Electroless silver-plated ACF filters showed antimicrobial efficiency, whereas pure ACF filters did not. It was found that electroless silver plating did not influence the physical filtration efficiency of ACF filters.