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Pt Thickness Dependence of Oscillatory Interlayer Exchange Coupling in [CoFe/Pt/CoFe]/IrMn Multilayers with Perpendicular Anisotropy
Lee. Sang-Suk, Choi. Jong-Gu, Kim. Sun-Wook, Hwang. Do-Guwn, Rhee. Jang-Roh 한국자기학회 Journal of magnetics 4 Pages
한국자기학회 Journal of magnetics 2005, Vol.10 No.2 44-47 (4 pages)
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BaFe12O19/Ni0.5Zn0.5Fe2O4 나노복합체 Ferrite의 Exchange-coupling 상호 작용과 자기 특성
오영우, Oh. Young-Woo 한국자기학회 韓國磁氣學會誌 5 Pages
한국자기학회 韓國磁氣學會誌 2014, Vol.24 No.3 81-85 (5 pages)
나노복합체 페라이트를 $600{sim}900^{circ}C$ 범위에서 1시간 동안 하소하였다. XRD 분석 결과, 경자성/연자성 나노복합체에서 경자성과 연자성이 공존하고 있음을 확인하였다. 나노복합체의 입자크기는 90 nm보다 작게 나타났다. 나노복합체는 단일 페라이트의 hysteresis 곡선과 같은 모양을 나타내었으며, 이로서 경자성과 연자성 사이에 exchange coupling이 잘 되었음을 확인할 수 있었다. 경자성/연자성 나노복합체 페라이트의 포화자화 값은 연자성보다 낮고 경자성보다 높았다. 잔류자화 값은 경자성과 연자성보다 크게... -
나노 연/경자성 분말 재료를 이용한 Exchange-coupling 자석의 제조 기술
김종렬, 조상근, 전광원, Kim. Jong-Ryoul, Cho. Sang-Geun, Jeon. Kwang-Won 한국자기학회 韓國磁氣學會誌 6 Pages
한국자기학회 韓國磁氣學會誌 2011, Vol.21 No.6 225-230 (6 pages)
최대 자기적이 높은 희토류 자석이 개발된 후 이를 중심으로 개발 및 응용분야가 지속적으로 확대되었다. 그러나, 최근 모터의 용도가 확대되는 추이에 따라서 회토류 자석의 사용이 증대됨에 따라서 희토류 원자재 수급 문제에 봉착하여 이를 해결하기 위해 희토류 저감 및 대체 자석에 대한 연구 분야가 중요한 이슈가 되고 있다. 본 보고서에서는 현재 사용 되고 있는 영구 자석에 대해 설명하고 이를 대체할 수 있는 기술 중 가능성이 높은 방법으로써 exchange-coupling 현상을 이용한 영구 자석 개발 기술에 대해 기술하고자 한다. -
Na+-Ca2+ Exchange Curtails Ca2+ before Its Diffusion to Global Ca2+i in the Rat Ventricular Myocyte
Sung-WanAhnChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.2 4 95-102 (8 pages)
In the heart, Na-Ca2 exchange (NCX) is the major Ca2 extrusion mechanism. NCX has been considered as a relaxation mechanism, as it reduces global [Ca2]i raised during activation. However, if NCX locates in the close proximity to the ryanodine receptor, then NCX would curtail Ca2 before its diffusion to global Ca2i. This will result in a global [Ca2]i decrease especially during its ascending phase rather than descending phase. Therefore, NCX would... -
Heterogeneity of the SR-dependent Inward Na+-Ca2+ Exchange Current in the Heavily Ca2+-buffered Rat Ventricular Myocytes
Kyung-BongYoon, Sung-WanAhn, ChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2004, Vol.8 No.2 6 101-110 (10 pages)
whole-cell mode. SR Ca2 release process was monitored by using forward-mode Na-Ca2 exchange after restriction of the interactions between Ca2 from SR and Na-Ca2 exchange within micro-domains with heavy cytosolic Ca2 buffering with 10 mM BAPTA. During stimulation every 10 s with a pulse roughly mimicking action potential, the initial outward current gradually turned into a huge inward current of 12.9⁑0.5 pA/pF. From the inward current,... -
Forward-Mode Na+-Ca2+ Exchange during Depolarization in the Rat Ventricular Myocytes with High EGTA
Eun-GiKim, ChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.6 5 487-494 (8 pages)
of Ca2 from sarcoplasmic reticulum through forward-mode Na-Ca2 exchange was studied in the rat ventricular myocytes patch-clamped in whole-cell configuration. In order to confine the Ca2 responses in a micro-domain by limiting the Ca2 diffusion time, rat ventricular myocytes were dialyzed with high (14 mM) EGTA. K current was suppressed by substituting KCl with 105 mM CsCl and 20 mM TEA in the pipette filling solution and by omitting KCl in the external... -
Relatoinship between Sarcoplasmic Reticular Calcium Release and Na+-Ca2+ Exchange in the Rat Myocardial Contraction
Eun-GiKim, SoonJinKim, ChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 14 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.3 4 197-210 (14 pages)
Suppressive role of Na-Ca2 exchange in myocardial tension generation was examined in the negative frequency-force relationship (FFR) of electric field stimulated left atria (LA) from postnatal developing rat heart and in the whole-cell clamped adult rat ventricular myocytes with high concentration of intracellular Ca2 buffer (14 mM EGTA). LA twitch amplitudes, which were suppressed by cyclopiazonic acid in a postnatal age-dependent manner, elicited frequency-dependent and... -
Roles of Na+-Ca2+ Exchange in the Negative Force-Frequency Relationship
ChangMannKoSoonJinKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.6 8 715-724 (10 pages)
concentration-dependent manner. When the Na-Ca2 exchange was blocked by Na and Ca2 depletion in the Krebs Hensleit buffer (0 Na-0 Ca2 KHB), the twitch amplitudes increased in a frequency-dependent manner, changing the negtive staircase into the positve one. Meanwhile, the 0 Na-0 Ca2 KHB applicationinduced enhancement was strongly suppressed by caffeine (5 mM) pretreatment. Only dibucaine among the local anesthetics increased the basal tone... -
흰쥐 심근의 역 사다리 효과에 있어서 생후 연령에 따른 Na+-Ca2+ 교환의 역할에 관한 연구 Studies on the Roles of Na+-Ca2+ Exchange according to Postnatal Age in the Negative Staircase Effect of the Rat Heart
이해용, 김순진, 고창만, Hae-yongLee, SoonJinKimChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1997, Vol.1 No.6 12 707-716 (10 pages)
tension according to the frequency in all groups except the 4 week-old group. The % decrease of the maximal developed tension of 4 week-old group at 1 Hz to that of 0.1 Hz after Na and Ca2 depletion was only a half of those of the yonger groups. Taken together, it is concluded that the Na-Ca2 exchange transports more Ca2 released from SR out of the cell in proportion to the frequency, and this is responsible for the negative staircase effect of the rat heart. -
Role of Na+Ca2+ Exchange in the Control of Contractility in Rabbit Basilar Arterial Smooth Muscle
Kim Eui-Yong, Han Jin 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 2호 6 159-168 (10 pages)
the extracellular Na+ concentration. The relaxation rate from caffeine-induced contraction was dependent on the extracellular Na+ concentration (0 mM, 140 mM). From the above results, it could be suggested that Na+/Ca2+ exchange can move Ca2+ either into or out of rabbit basilar arterial smooth muscle. Ca2+ entry or extrusion is dependent upon the Na+ electrochemical gradient. Na+/Ca2+ exchange plays a significant role in the regulation of contractility in rabbit basilar arterial smooth muscle.... -
A Study on the Na+/Ca2+ Exchange Mechanism in the Smooth Muscle of Guinea-pig Stomach
Kim, Eui-Yong, Han, Jin, Kim, Ki-Whan 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1992, 제 26권 제 1호 6 55-68 (14 pages)
of Na+/Ca2+ exchange mechanism. All experiments were performed in tris buffered Tyrode solution which was aerated with 100% O2 and kept at 35℃. The treatment of 10-5 ouabain was performed to induce intracellular Na+ loading prior to the start of experiment. The results were as follows: 1. Na+-free Tyrode or high Ca2+-Tyrode solution hyperpolarized the membrane potential and induced contracture. The time course of contracture was similar to that of change in membrane potential. 2. The degree of... -
Sodium-dependent magnesium efflux of heart
Shang Jin Kim 대한수의학회 대한수의학회 학술대회발표집 1 Pages
대한수의학회 대한수의학회 학술대회발표집 추계학술심포지움 261 335-335 (1 pages)
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Therapeutic mild hypothermia-induced Mg2+ homeostasis in heart
Sei Jin Lee, Gi Beum Kim, Hyung Sub Kang, Jin Shang Kim, Shang Jin Kim 대한수의학회 대한수의학회 학술대회발표집 2 Pages
대한수의학회 대한수의학회 학술대회발표집 추계학술심포지움 260 334-335 (2 pages)
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pH-dependent modulation of intracellular free magnesium ions with ion- selective electrodes in papillary muscle of guinea pig
Shang-Jin Kim, In-Gook Cho, Hyung-Sub Kang, Jin-Shang Kim 대한수의학회 Journal of Veterinary Science 6 Pages
대한수의학회 Journal of Veterinary Science 2006, 제 7권 제 1호 5 31-36 (6 pages)
A change in pH can alter the intracellular concentration of electrolytes such as intracellular Ca2+ and Na+ ([Na+]i) that are important for the cardiac function.For the determination of the role of pH in the cardiac magnesium homeostasis, the intracellular Mg 2+ concentration ([Mg 2+]i), membrane potential and contraction in the papillary muscle of guinea pigs using ion-selective electrodes changing extracellular pH ([pH]o)or intracellular pH ([pH ]i )were measured in this study. A high... -
Gintonin facilitates catecholamine secretion from the perfused adrenal medulla
Seung-YeolNa, Ki-HwanKim, Mi-SungChoi, Kang-SuHa, Dong-YoonLim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 11 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2016, Vol.20 No.6 9 629-639 (11 pages)
The present study was designed to investigate the characteristics of gintonin, one of components isolated from Korean Ginseng on secretion of catecholamines (CA) from the isolated perfused model of rat adrenal gland and to clarify its mechanism of action. Gintonin (1 to 30 μg/ml), perfused into an adrenal vein, markedly increased the CA secretion from the perfused rat adrenal medulla in a dose-dependent fashion. The gintonin-evoked CA secretion was greatly inhibited in the presence of... -
cAMP induction by ouabain promotes endothelin-1 secretion via MAPK/ERK signaling in beating rabbit atria
Li-qunPeng, PingLi, Qiu-liZhang, LanHong, Li-pingLiu, XunCui, Bai-riCui 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2016, Vol.20 No.1 2 9-14 (6 pages)
Adenosine 3',5'-cyclic monophosphate (cAMP) participates in the regulation of numerous cellular functions, including the Na+-K+-ATPase (sodium pump). Ouabain, used in the treatment of several heart diseases, is known to increase cAMP levels but its effects on the atrium are not understood. The aim of the present study was to examine the effect of ouabain on the regulation of atrial cAMP production and its roles in atrial endothelin-1 (ET-1) secretion in isolated perfused beating rabbit atria.... -
The Critical Roles of Zinc: Beyond Impact on Myocardial Signaling
SungRyulLee, SuJinNoh, JuliusRyanPronto, YuJeongJeong, HyoungKyuKim, InSungSong, ZhelongXu, HyogYoungKwon, SeChanKang, Eun-HwaSohn, KyungS 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 12 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2015, Vol.19 No.5 1 389-400 (12 pages)
Zinc has been considered as a vital constituent of proteins, including enzymes. Mobile reactive zinc (Zn2+) is the key form of zinc involved in signal transductions, which are mainly driven by its binding to proteins or the release of zinc from proteins, possibly via a redox switch. There has been growing evidence of zinc’s critical role in cell signaling, due to its flexible coordination geometry and rapid shifts in protein conformation to perform biological reactions. The importance and... -
A Novel Nicotinamide Adenine Dinucleotide Correction Method for Mitochondrial Ca2+ Measurement with FURA-2-FF in Single Permeabilized Ventricular Myocytes of Rat
JeongHoonLee, JeongMiHa, ChaeHunLeem 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2015, Vol.19 No.4 10 373-382 (10 pages)
Fura-2 analogs are ratiometric fluoroprobes that are widely used for the quantitative measurement of [Ca2+]. However, the dye usage is intrinsically limited, as the dyes require ultraviolet (UV) excitation, which can also generate great interference, mainly from nicotinamide adenine dinucleotide (NADH) autofluorescence. Specifically, this limitation causes serious problems for the quantitative measurement of mitochondrial [Ca2+], as no available ratiometric dyes are excited in the visible range.... -
Altered Regulation of Renal Acid Base Transporters in Response to Ammonium Chloride Loading in Rats
EunYoungKim, JoonSeokChoi, KoEunLee, ChangSeongKim, EunHuiBae, SeongKwonMa, SuhnHeeKim, JongUnLee, SooWanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2012, Vol.16 No.2 2 91-95 (5 pages)
The role of the kidney in combating metabolic acidosis has been a subject of considerable interest for many years. The present study was aimed to determine whether there is an altered regulation of renal acid base transporters in acute and chronic acid loading. Male Sprague-Dawley rats were used. Metabolic acidosis was induced by administration of NH4Cl for 2 days (acute) and for 7days (chronic). The serum and urinary pH and bicarbonate were measured. The protein expression of renal acid base... -
Requirement of Pretone by Thromboxane A2 for Hypoxic Pulmonary Vasoconstriction in Precision-cut Lung Slices of Rat
SuJungPark, HaeYoungYoo, HyeJinKim, , , JinKyoungKim, Yin-HuaZhang, SungJoonKim, 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2012, Vol.16 No.1 9 59-64 (6 pages)
Hypoxic pulmonary vasoconstriction (HPV) is physiologically important response for preventing mismatching between ventilation and perfusion in lungs. The HPV of isolated pulmonary arteries (HPV-PA) usually require a partial pretone by thromboxane agonist (U46619). Because the HPV of ventilated/perfused lungs (HPV-lung) can be triggered without pretone conditioning, we suspected that a putative tissue factor might be responsible for the pretone of HPV. Here we investigated whether HPV can be also... -
A Computational Model of Cytosolic and Mitochondrial [Ca2＋] in Paced Rat Ventricular Myocytes
JaeBoumYoum, SeongWooChoi, ChangHanJang, HyoungKyuKim, ChaeHunLeem, NariKim, JinHan 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 23 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2011, Vol.15 No.4 5 217-239 (23 pages)
We carried out a series of experiment demonstrating the role of mitochondria in the cytosolic and mitochondrial Ca2＋ transients and compared the results with those from computer simulation. In rat ventricular myocytes, increasing the rate of stimulation (1∼3 Hz) made both the diastolic and systolic [Ca2＋] bigger in mitochondria as well as in cytosol. As L-type Ca2＋ channel has key influence on the amplitude of Ca2＋-induced Ca2＋ release, the relation between stimulus frequency and the... -
Modeling of Arrhythmogenic Automaticity Induced by Stretch in Rat Atrial Myocytes
JaeBoumYoum, ChaeHunLeem, YinHuaZhang, NariKim, JinHan, YungE.Earm 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2008, Vol.12 No.5 8 267-274 (8 pages)
The early phase was driven by increased background conductance of voltage-gated Na＋ channel, whereas the later phase was driven by the reverse-mode operation of Na＋/Ca2＋ exchange current secondary to the accumulation of Na＋ and Ca2＋ through SACs. These results of simulation successfully demonstrate how the SACs can induce automaticity in a single atrial myocyte which may act as a focus to initiate and maintain atrial fibrillation in concert with other arrhythmogenic changes in the heart. -
Effects of Apigenin on Glutamate-induced [Ca2+]i Increases in Cultured Rat Hippocampal Neurons
Ji-HwaHan, KiJungKim, Hyun-JongJang, JuHoJang, Myung-JunKim, KiWugSung, Duck-JooRhie, Yang-HyeokJo, SangJuneHahn, Mun-YongLee, ShinHeeYoon 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2008, Vol.12 No.2 2 43-50 (8 pages)
Flavonoids have been shown to affect calcium signaling in neurons. However, there are no reports on the effect of apigenin on glutamate-induced calcium signaling in neurons. We investigated whether apigenin affects glutamate-induced increase of free intracellular Ca2+ concentration ([Ca2+]i) in cultured rat hippocampal neurons, using fura-2-based digital calcium imaging and microfluorimetry. The hippocampal neurons were used between 10 and 13 days in culture from embryonic day 18 rats.... -
Neurovascular Mechanisms in Stroke, Neurodegeneration and Recovery
EngH.Lo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2006, Vol.10 No.5 1 223-230 (8 pages)
The emerging concept of the“neurovascular unit”may enable a powerful paradigm shift for neuroscience. Instead of a pure focus on the“neurobiology”of disease, an opportunity now exists to return to a more integrative approach. The neurovascular unit emphasizes that signaling between vascular and neuronal compartments comprise the basis for both function and dysfunction in brain. Hence, brain disorders are not just due to death of neurons, but instead manifested as cell signaling perturbations... -
Differential Activation of Ras/Raf/MAPK Pathway between Heart and Cerebral Artery in Isoproterenol-induced Cardiac Hypertrophy
HyunjuKim, NariKim, HyunJoo, JaeBoumYoum, WonSunPark, MohamedWarda, SunghyunKang, VuThiThu, TranMinhKhoa, JinHan 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.5 7 299-304 (6 pages)
Cardiac hypertrophy contributes an increased risk to major cerebrovascular events. However, the molecular mechanisms underlying cerebrovascular dysfunction during cardiac hypertrophy have not yet been characterized. In the present study, we examined the molecular mechanism of isoproterenol (ISO)-evoked activation of Ras/Raf/MAPK pathways as well as PKA activity in cerebral artery of rabbits, and we also studied whether the activations of these signaling pathways were altered in cerebral artery,... -
Changes of Cytosolic Ca2+ under Metabolic Inhibition in Isolated Rat Ventricular Myocytes
SunghyunKang, NariKim, HyunJoo, JaeBoumYoum, WonSunPark, MohamedWarda, HyungkyuKim, DangVanCuong, TaehoKim, EuiyongKim, JinHan 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.5 6 291-298 (8 pages)
membrane potential (ΔΨm), and cytosolic Ca2 were measured, using Rhod-2 AM, TMRE, and Fluo-4 AM fluorescent dyes, respectively, by Laser Scanning Confocal Microscopy (LSCM). Furthermore, the role of sarcolemmal Na/Ca2 exchange (NCX) in cytosolic Ca2 efflux was studied in KB-R7943 and Na-free normal Tyrode's solution (143 mM LiCl ). When DNP was applied to cells loaded with Fluo-4 AM, Fluo-4 AM fluorescence intensity initially increased by 70⁑10% within...
