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백서 심근경색모델에서 시간경과와 경색의 크기에 따른 심자도의 변화
김미성(Mi Sung Kim),박영선(Young Sun Park),권순길(Sun Gil Kwon),지정훈(Jeong Hoon Ji),신종성(Jong Sung Shin),오광식(Kwang Sik Oh),양용모(Yong Mo Yang),연태진(Tae Jin Youn),김동운(Dong Woon Kim),조명찬(Myeong Chan Cho),이용호(Yong Ho 대한내과학회 2002 대한내과학회지 Vol.62 No.1
Background: Magnetocardiogram (MCG), which records the changes of magnetic fields generated by the heart`s electrical activity, theoritically can provide unique data for clinical application. To date, MCG has been investigated only at a single time point after myocardial infarction (MI) with severe left ventricular dysfunction in rats. The purpose of the present study was to investigate sequential changes of MCG after MI and to evaluate effects of infarct size on MCG. Methods: Acute MI were induced by the permanent ligation of left coronary artery in 22 rats. Magnetic fields were recorded just above a rat with Nb Superconducting Quantum Interference Device (SQUID) gradiometer inside a magnetically shielded room. MCG was measured before and immediately after surgery and it was subsequently recorded at the time points of 1, 4 and 6 hours post operatively. MCG was also measured at 1, 3, 7 and 21 days after surgery. Results: Elevation of ST segment and appearance of pathological Q wave on the MCG were evident immediately after the ligation of coronary artery and persisted to 6 hours after MI. On MCG, ST segment was depressed and T wave was inverted from 1 day after MI. In rats with small-and moderate- sized MI (infarct size〈30%), ST depression returned to near the isoelectric level and Q wave disappeared from 7 days after MI. However, ST depression and Q wave were still present in rats with larger infarct (infarct size≥30%). Conclusion: Evolutional changes of MCG were well-recognized up to 21 days after MI. Furthermore, the infarct size can be expressed by the extent of Q wave and ST segment depression on MCG. Taken together, these data indicate that MCG is a helpful modality for the diagnosis, evaluation of infarct size and follow up after MI.(Korean J Med 62:42-48, 2002)
Sang Soo Ham,Yoon Young Jang,Jin Ho Song,Hyang Mi Lee,Kwang Joon Kim,Jun Sik Hong,Yong Kyoo Shin 대한생리학회-대한약리학회 2000 The Korean Journal of Physiology & Pharmacology Vol.4 No.6
<P> Polymorphonuclear leukocytes (PMNs) play an important role in myocardial ischemia/reperfusion (MI/R) injury. Moreover, platelets are also important blood cells that can aggravate myocardial ischemic injury. This study was designed to test the effects of PMNs and platelets separately and together in provoking cardiac dysfunction in isolated perfused rat hearts following ischemia and reperfusion. Additional control rat hearts were perfused with 75⁓10<SUP>6</SUP> PMNs, with 75⁓10<SUP>6</SUP> platelets, or with 75⁓10<SUP>6</SUP> PMNs75⁓10<SUP>6</SUP> platelets over a five minute perfusion followed by a 75 min observation period. No significant reduction in coronary flow (CF), left ventricular developed pressure (LVDP), or the first derivative of LVDP (dP/dt max) was observed at the end of the observation period in any non-ischemic group. Similarly, global ischemia (I) for 20 min followed by 45 minutes of reperfusion (R) produced no sustained effects on the final recovery of any of these parameters in any group of hearts perfused in the absence of blood cells. However, I/R hearts perfused with either PMNs or platelets alone exhibited decreases in these variables of 5∼10% (p<0.05 from control). Furthermore, I/R hearts perfused with both PMNs and platelets exhibited decreases of 50 to 60% in all measurements of cardiac function (p<0.01). These dual cell perfused I/R hearts also exhibited marked increases in cardiac myeloperoxidase (MPO) activity indicating a significant PMN infiltration, and enhanced P-selectin expression on the coronary microvascular endothelium. All cardiaodynamic effects as well as PMN accumulation and P-selectin expression were markedly attenuated by a recombinant soluble PSGL-1 which inhibits selectin mediated cell adhesion. These results provide evidence that platelets and PMNs act synergistically in provoking post-reperfusion cardiac dysfunction, and that this may be largely due to cell to cell interactions mediated by P-selectin. These results also demonstrate that a recombinant soluble PSGL-1 reduces myocardial reperfusion injury by platelet and PMNs interaction.
( Hyun Su Baek ),( Hye Sung Lee ),( Bok Joo Kim ),( In Kyo Chung ),( Chul Hoon Kim ),( Sun Mi Jin ),( Hie Sung Hwang ),( Sang Hun Shin2 ) 한국조직공학·재생의학회 2011 조직공학과 재생의학 Vol.8 No.6
The objective of this study was to evaluate platelet-rich fibrin (PRF)’s effectiveness in repairing articular disc defect in the temporomandibular joint (TMJ) of rabbits. Eight rabbits were divided into four groups of two rabbits each, corresponding to groups A, B, C, and D. Both TMJs of all of the rabbits were used in the experiments: the right joints comprised the experimental groups, and the left ones, the control groups. The disc defect was circular and 2 mm in diameter. In the experimental groups, the PRF was compressed into the defect, whereas the control group defects were left untreated. A, B, C, and D groups were sacrificed at the 1st, 2nd, 4th and 6th weeks, respectively. The defects of each control group exhibited no specific changes. Contrastingly, in each experimental group, there was an increased number of chondroblasts at the margins of the defects, along with accelerated cell differentiation and a columnar cell arrangement observable at the time of cell differentiation. The experimental groups showed inflammatory cell infiltrations and fibrosis by the 1st week, maturation of chondrocytes by the 2nd week, and proliferation by the 4th week, after which the defects began to be filled with chondrocytes, a process that was complete after the 6th week. In the histological evaluation (H-E), the experimental groups showed significant increases of chondroblasts after the 2nd and 4th weeks, as well as regular columns of chondrocyte arrays observable during cell division. After 6 weeks, the defects were filled with chondrocytes.
Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19
<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>
실용음악 전공 학생들의 발성치료 전후 성대 및 음성 특성 비교
황연신,심미란,김철준,최용석,김상연,최찬호,선동일,Hwang, Yeon Shin,Shim, Mi Ran,Kim, Chul Jun,Choi, Yong Suk,Kim, Sang Yeon,Choi, Chan Ho,Sun, Dong Il 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.2
Background and Objectives : Many students major in applied music singing have various difficulties in phonation when they sing or perform. But the studies about this cause are lack. The purpose of this study is whether singing voice therapy based on vocal music is effective or not to applied music singing students that have difficulties in phonation. Materials and Methods : Singing voice therapy program had been done to 8 students major in applied music singing during 7 weeks. We did laryngeal stroboscope, perceptual, acoustic and aerodynamic examination before and after singing voice therapy to this students. And we studied post examination results have differences or improvements compared to pre examination results. Results : Four male students don't have effective improvement after singing voice therapy but they shows slight improvement in aerodynamic examination values compared to pre examination values. Four female students shows improvement in aerodynamic examination values and pitch range increasing. Above all, one student's vocal nodules disappeared after singing voice therapy. Conclusion : Singing voice therapy based on music singing is very effective to the students major in applied music singing. Above all, their curriculum in applied music singing should include phonation training based on music singing before training perform and technic practices.
Shin, Geo-Myung,Lee, Jung-Woo,Choi, Soon-Mi,Moon, Seung-Hyun,Yoo, Sang-Im Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3
<P>We report the effects of barium-based perovskite particle inclusions of BaCeO<SUB>3</SUB> (BCO), BaZrO<SUB>3</SUB> (BZO), and YBa<SUB>2</SUB>SnO<SUB>5.5</SUB> (YBSO) on the thickness dependence of critical current density <inline-formula> <TEX-math notation='LaTeX'>$(J_c)$</tex-math></inline-formula> in metal organic deposition (MOD) -processed <inline-formula> <TEX-math notation='LaTeX'><TEX>$\mbox{YBa}_2\mbox{Cu}_3\mbox{O}_{7-\delta} $</TEX></tex-math></inline-formula> (YBCO) films on the SrTiO<SUB>3</SUB> (STO) single-crystal substrate. With increasing film thickness, while BZO-doped YBCO films show a serious degradation in <inline-formula> <TEX-math notation='LaTeX'><TEX>$J_\mathrm{c} $</TEX></tex-math></inline-formula>, caused by the interlayer at the boundaries of multicoated layers, BCO- and YBSO- doped films exhibit a significant enhancement of <inline-formula> <TEX-math notation='LaTeX'>$J_c$</tex-math></inline-formula> (77 K, self-field) over ∼1 μm thickness even though BCO- or YBSO-doped YBCO films have degraded <I>in-plane</I> textures compared with undoped films, implying that these perovskite dopants affect not only the pinning properties but also the growth of multicoated layers. The highest critical current <inline-formula> <TEX-math notation='LaTeX'><TEX>$(I_\mathrm{c} )$</TEX></tex-math></inline-formula> value over 440 A/cm-width, corresponding to <inline-formula> <TEX-math notation='LaTeX'><TEX>$J_\mathrm{c} $</TEX></tex-math></inline-formula> value of 1.8 MA/cm<SUP>2</SUP>, was obtained from the 2.4-<inline-formula> <TEX-math notation='LaTeX'><TEX>$\mu\mathrm{m}$</TEX></tex-math></inline-formula>-thick YBSO-doped film.</P>
Shin, Won-Kyung,Park, Se-Mi,Lee, Yoon-Sung,Kim, Dong-Won The Electrochemical Society 2015 Journal of the Electrochemical Society Vol.162 No.14
<P>Core-shell structured SiO<SUB>2</SUB> particles with a poly(lithium acrylate) shell were synthesized and used in preparing a composite gel electrolyte. The composite gel electrolyte exhibited high ionic conductivity and favorable interfacial characteristics at the lithium electrode. The use of a composite gel electrolyte containing SiO<SUB>2</SUB>(Li<SUP>+</SUP>) particles effectively suppressed both the dendrite growth of lithium and dissolution of transition metals from the active LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> material. The lithium metal polymer cell composed of a lithium negative electrode and a LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> positive electrode delivered a high discharge capacity of 136.6 mAh g<SUP>−1</SUP> and exhibited good capacity retention.</P>
Corrigendum: Korean treatment recommendations for patients with axial spondyloarthritis
Mi Ryoung Seo,Jina Yeo,Jun Won Park,Yeon-Ah Lee,Ju Ho Lee,Eun Ha Kang,Seon Mi Ji,Seong-Ryul Kwon,Seong-Kyu Kim,Tae-Jong Kim,Tae-Hwan Kim,Hye Won Kim,Min-Chan Park,Kichul Shin,Sang-Hoon Lee,Eun Young L 대한내과학회 2024 The Korean Journal of Internal Medicine Vol.39 No.1
( Sung Hoon Choi ),( Mi Sol Lee ),( Shin Won Hwang ),( Jun Yong Park ),( Seung Up Kim ),( Sang Hoon Ahn ),( Weon Sang Ro ),( Kwang Hyub Han ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.1
Objectives: HIF-1β (ARNT) formed dimerization of HIF-1α, involved in various aspects of cancer biology, including proliferation and survival under hypoxic condition. This is an in vitro study that investigated the mechanism by which small interference HIF-1β (siHIF-1β) inhibits HIF-1α dimerization and thus it lead to suppress tumor cell growth. Method: Three HCC cell lines (HepG2, Huh 7 and Hep3B) were transfected with HIF-1β coding siRNA and cultured under hypoxic conditions (1% O2, 24 hours). Following transfection, the expression levels of HIF-1β , HIF-1α, and growth factors were examined through immuno-blotting. In addition, tumor growth was measured by MTT assay and tumor activity was measured by TUNEL, tumor invasion and migration assay. Results: The inhibition of HIF-1β by small interference RNA (siHIF-1β) led to suppression of tumor cell growth through inhibition of HIF dimerization under hypoxia condition. This effect was increased and maximized at 48 hrs after treatment of HIF-1β coding siRNA. Inhibition of HIF dimerization through treatment of siHIF-1β also regulated the expression of tumor growth related factors (VEGF, EGF and HGF). Inhibition of HIF- dimerization precluded tumor invasion and migration in variable HCC cell lines. Conclusions: Inhibition of HIF dimerization by siHIF-1β may lead to anti-tumor effects in a hypoxic condition of tumor environment.