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Kang, Kwi Young,Kim, Hyun-Ok,Kwok, Seung-Ki,Ju, Ji Hyeon,Park, Kyung-Su,Sun, Dong-Il,Jhun, Joo Yeon,Oh, Hye Jwa,Park, Sung-Hwan,Kim, Ho-Youn BioMed Central 2011 ARTHRITIS RESEARCH AND THERAPY Vol.13 No.5
<P><B>Introduction</B></P><P>Interleukin (IL)-21 is a cytokine that controls the functional activity of effector T helper cells and the differentiation of Th17 cells, and promotes B-cell differentiation. To test whether IL-21 participates in the pathogenesis of primary Sjögren's syndrome (SS), serum IL-21 level was measured and IL-21 expression in the labial salivary glands (LSG) was examined.</P><P><B>Methods</B></P><P>Serum IL-21 levels in 40 primary SS, 40 rheumatoid arthritis (RA), and 38 systemic lupus erythematosus (SLE) patients and 20 healthy controls were measured. Serum IL-21 levels of SS patients were assessed for correlations with laboratory data, including anti-nuclear antibody, anti-Ro/La antibodies, globulin, immunoglobulin (Ig) class, and IgG subclass. LSGs from 16 primary SS and 4 controls with sicca symptoms were evaluated for IL-21 and IL-21 receptor (IL-21R) expression by immunohistochemistry. Confocal microscopy was performed to further characterize the IL-21 positive cells.</P><P><B>Results</B></P><P>Primary SS patients had significantly higher serum IL-21 levels than controls, and these increments correlated positively with levels of IgG, IgG1. Serum IgG1 levels correlated with anti-Ro antibody titers. Immunohistochemical analyses showed that lymphocytic foci and the periductal area of the LSGs from SS patients expressed high levels of IL-21 and lower levels of IL-21R, whereas the control LSGs showed minimal expression of both antigens. The more the lymphocyte infiltrated, IL-21expression in LSGs showed a tendency to increase. Confocal microscopic analyses revealed that IL-21 expressing infiltrating lymphocytes in the LSGs of SS patients also expressed CXCR5.</P><P><B>Conclusions</B></P><P>Primary SS is associated with high serum IL-21 levels that correlate positively with serum IgG, especially IgG1, levels. The expression of IL-21 is increased as more lymphocytes infiltrated in LSGs. These observations suggest that IL-21 may play an important role in primary SS pathogenesis.</P>
트라이애슬러의 비타민Q 섭취가 호흡순환기능 및 항산화 효소활성에 미치는 영향
현송자,김귀백,박상일,석혜경 東亞大學校附設스포츠科學硏究所 2002 스포츠科學硏究論文集 Vol.20 No.-
The purpose of this present study was to investigate the effect of VitaminQ supplementation on antioxidant enzyme activities and cardiorespiratory function following prolonged exercise in trained triathlers. Male 14 healthy college students of trained triathlers participated in exercise sessions. The subjects were divided into 2 groups, as Non-supplement(NS) or VitaminQ supplement(VQ) groups. VitaminQ subjects were participated in two exercise sessions: an initial prolonged exercise(swim 750m, running 10㎞) and 70%V O2max treadmill running exercise. The Non-supplement group fed normal diet. VitaminQ group adminstated 90㎎/day for 4weeks. Venous blood samples were drown from the forearm antecubital vein pre-supplement, pre-exercise and immediately post-exercise. The results of this study can be summarized as follow: First, the SOD activity of RBC was not changed, while the GPx, GR or GR/GPx activies of Hb were significantly increased following prolonged exercise with CoQ10 supplementation. Second, 70%VO2max treadmill running exercise increased significantly the V O2max and VE, but the heart rate significantly decreased. In conclusion, the present results clearly show that the VitaminQ supplementation gave rise to increase the GPx or GR activies and to improve the cardiorespiratory function.
16주 저항성 트레이닝이 엘리트 역도선수의 피로물질과 근 손상, 산화적 손상, myokine에 미치는 영향
Cheol-Woo Kim(김철우),Gun-Do Kim(김군도),Sung-Hwun Kang(강성훈),Chan-Hoo Park(박찬호),Kwi-Baek Kim(김귀백),Young-Il Kim(김영일) 한국생명과학회 2012 생명과학회지 Vol.22 No.2
본 연구의 목적은 16주 근력 트레이닝을 동반한 TRX, 코어 훈련이 엘리트 역도 선수의 피로물질과 근 손상, 산화적 손상, myokine에 미치는 영향을 규명하기 위함이다. 본 연구 대상자들은 총 10명(남 6명, 여 4명)으로 구성되어 있으며 16주 근력 운동과 더불어 코어 및 TRX 트레이닝을 실시하여 다음과 같은 결과를 얻었다. Ammonia와 Pi는 트레이닝 전에 비해 점차적으로 증가함을 나타냈으나 통계적으로 유의한 차이는 나타나지 않았다. 근 손상 물질인 CK는 트레이닝 전에 비해 8주에 유의한(p<0.05) 증가를 나타냈으며, LDH는 트레이닝 전에 비해 8주에 유의한(p<0.05) 증가를 나타냈지만 16주에는 감소하는 경향을 나타냈다. 산화적 손상 지표인 MDA는 트레이닝전과 16주에 비해 트레이닝 8주에서 유의한(p<0.05) 증가를 나타냈으며, 항산화 지표인 TAS 또한 트레이닝 전에 비해 트레이닝 8주에서 통계적으로 유의한(p<0.05) 증가를 나타냈다. Myokine인 IL-15는 트레이닝 전에 비하여 트레이닝 8주와 16주에 통계적으로 유의한(p<0.05) 증가를 나타냈다. 결과적으로 16주 고강도 근력 트레이닝은 엘리트 중학교 역도선수의 피로물질과 근 손상, 산화적 손상, myokine에는 긍정적이 영향을 미친 것으로 나타났다. The purpose of this study was to examine the effect of 16 weeks of resistance training on the fatigue factor, muscle soreness, oxidative stress, and myokine in elite weightlifters. A total of 10 subjects (six male, four female) participated in this study. The results were compared according to baseline, 8 weeks, and 16 weeks. Ammonia and Pi were increased through 16 weeks of resistance training, but this result was not significant. CK was significantly (p<0.05) increased at 8 weeks and 16 weeks compared to baseline, while LDH was significantly (p<0.05) increased at 8 weeks compared to baseline. The MDA of the oxidative stress factor was significantly (p<0.05) increased at 8 weeks compared to baseline and 16 weeks, and TAS of the antioxidant factor was significantly (p<0.05) increased at 8 weeks compared to baseline. The IL-15 of the myokine was significantly (p<0.05) increased at baseline compared to 8 weeks and 16 weeks. In conclusion, 16 weeks of high-intensity resistance training may have a positive effect on peripheral fatigue factors, muscle soreness, oxidative stress, and myokine in elite weightlifters.
Stretchable piezoelectric nanocomposite generator
Park Kwi-Il,Jeong Chang Kyu,김나경,Lee Keon Jae 나노기술연구협의회 2016 Nano Convergence Vol.3 No.12
Piezoelectric energy conversion that generate electric energy from ambient mechanical and vibrational movements is promising energy harvesting technology because it can use more accessible energy resources than other renewable natural energy. In particular, flexible and stretchable piezoelectric energy harvesters which can harvest the tiny biomechanical motions inside human body into electricity properly facilitate not only the self-powered energy system for flexible and wearable electronics but also sensitive piezoelectric sensors for motion detectors and in vivo diagnosis kits. Since the piezoelectric ZnO nanowires (NWs)-based energy harvesters (nanogenerators) were proposed in 2006, many researchers have attempted the nanogenerator by using the various fabrication process such as nanowire growth, electrospinning, and transfer techniques with piezoelectric materials including polyvinylidene fluoride (PVDF) polymer and perovskite ceramics. In 2012, the composite-based nanogenerators were developed using simple, low-cost, and scalable methods to overcome the significant issues with previously-reported energy harvester, such as insufficient output performance and size limitation. This review paper provides a brief overview of flexible and stretchable piezoelectric nanocomposite generator for realizing the self-powered energy system with development history, power performance, and applications.
Piezoelectric BaTiO<sub>3</sub> Thin Film Nanogenerator on Plastic Substrates
Park, Kwi-Il,Xu, Sheng,Liu, Ying,Hwang, Geon-Tae,Kang, Suk-Joong L.,Wang, Zhong Lin,Lee, Keon Jae American Chemical Society 2010 Nano letters Vol.10 No.12
<P>The piezoelectric generation of perovskite BaTiO<SUB>3</SUB> thin films on a flexible substrate has been applied to convert mechanical energy to electrical energy for the first time. Ferroelectric BaTiO<SUB>3</SUB> thin films were deposited by radio frequency magnetron sputtering on a Pt/Ti/SiO<SUB>2</SUB>/(100) Si substrate and poled under an electric field of 100 kV/cm. The metal−insulator (BaTiO<SUB>3</SUB>)−metal-structured ribbons were successfully transferred onto a flexible substrate and connected by interdigitated electrodes. When periodically deformed by a bending stage, a flexible BaTiO<SUB>3</SUB> nanogenerator can generate an output voltage of up to 1.0 V. The fabricated nanogenerator produced an output current density of 0.19 μA/cm<SUP>2</SUP> and a power density of ∼7 mW/cm<SUP>3</SUP>. The results show that a nanogenerator can be used to power flexible displays by means of mechanical agitations for future touchable display technologies.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-12/nl102959k/production/images/medium/nl-2010-02959k_0002.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl102959k'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl102959k'>ACS Electronic Supporting Info</A></P>
Lead-free BaTiO3 nanowires-based flexible nanocomposite generator.
Park, Kwi-Il,Bae, Soo Bin,Yang, Seong Ho,Lee, Hyung Ik,Lee, Kisu,Lee, Seung Jun RSC Pub 2014 Nanoscale Vol.6 No.15
<P>We have synthesized BaTiO3 nanowires (NWs) via a simple hydrothermal method at low temperature and developed a lead-free, flexible nanocomposite generator (NCG) device by a simple, low-cost, and scalable spin-coating method. The hydrothermally grown BaTiO3 NWs are mixed in a polymer matrix without a toxic dispersion enhancer to produce a piezoelectric nanocomposite (p-NC). During periodical and regular bending and unbending motions, the NCG device fabricated by utilizing a BaTiO3 NWs-polydimethylsiloxane (PDMS) composite successfully harvests the output voltage of 7.0 V and current signals of 360 nA, which are utilized to drive a liquid crystal display (LCD). We also characterized the instantaneous power ( 1.2 μW) of the NCG device by calculating the load voltage and current through the connected external resistance.</P>