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Soft Nanoscience Letters 2013年第4期3卷 87-92页

作者： Abhishek Bhat Jonathan Rodriguez Hua Qin hyun Cheol shin hyuncheol shin Joerg Clobes Dustin Kreft Jonghoo Park Eric Stava Minrui Yu Robert H. Blick Electrical Engineering Kyungpook National University Daegu Republic of Korea Genome Center of Wisconsin University of Wisconsin-Madison Madison USA. Laboratory for Molecular-Scale Engineering Department of Electrical and Computer Engineering University of Wisconsin-Madi- son Madison USA Laboratory for Molecular-Scale Engineering Department of Electrical and Computer Engineering University of Wisconsin-Madi- son Madison USA Laboratory of Nanodevices and Application Suzhou Institute of Nanotech and Nanobionics Chinese Academy of Sciences Beijing China

We present first results from a hybrid coplanar waveguide microfluidic tank circuit for monitoring lipid bilayer formation and fluctuations of integrated proteins. The coplanar waveguide is a radio frequency resonator operating at ~250 MHz. Changes within the integrated microfluidic chamber, such as vesicle bursting and subsequent nanopore formation alter the reflected signal, and can be detected with nanosecond resolution. We show experimental evidence of such alterations when the microfluidic channel is filled with giant unilamellar vesicles (GUVs). Subsequent settling and bursting of the GUVs form planar lipid bilayers, yielding a detectable change in the resonant frequency of the device. Results from finite element simulations of our device correlate well with our experimental evidence. These simulations also indicate that nanopore formation within the bilayer is easily detectable. The simulated structure allows for incorporation of microfluidics as well as simultaneous RF and DC recordings. The technique holds promise for high throughput drug screening applications and could also be used as an in-plane probe for various other applications. It opens up possibilities of exploring ion channels and other nano scale pores in a whole new frequency band allowing for operating at bandwidths well above the traditional DC methods.

关键词： Radio Frequency Simulations Lipid Bilayers Ion Channels High Speed Planar Detection

Characteristics of Mechanical and Electrical Power Transmission for Small-Scaled Wind Turbine

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World Journal of Engineering and Technology 2016年第3期4卷 82-90页

作者： Kyu-Jin Lee hyun-Dai Yang Sung-Hoon Park Sung-Do Song Byung-Sun Kim Joong-Ho shin Department of Mechanical Design and Manufacturing Changwon National University Changwon-si South Korea

Small-scaled wind turbine is converted to mechanical power of windmill to electric power by generator. However almost all studies seems to have overlooked converting relation of mechanical & electric power. It the reason for was very difficult establishing wind turbine system. In this paper, it is define equation of converting relation of mechanical & electric power. And it is verified by experimental methods. Defined equation will be used in developing electric devices such as inverter and controller in wind turbines. In addition this method can be used in the fields that utilize the rotational power into electrical power through generator.

关键词： Wind Turbine Generator Mechanical Power Electrical Power

Contrast-enhanced ultrasonography for the evaluation of liver fibrosis after biliary obstruction

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World Journal of Gastroenterology 2015年第9期21卷 2614-2621页

作者： hyun Joo shin Eun Young Chang Hye Sun Lee Jung Hwa Hong Gyuri Park hyun Gi Kim Myung-Joon Kim Mi-Jung Lee Department of Radiology and Research Institute of Radiological Science Severance Children’s HospitalYonsei University College of MedicineSeoul 120-752South Korea Department of Pediatric Surgery Severance Children’s HospitalYonsei University College of MedicineSeoul 120-752South Korea Biostatistics Collaboration Unit Yonsei University College of MedicineSeoul 120-752South Korea Department of Laboratory Animal Resources Avison Bio Medical Research CenterYonsei University College of MedicineSeoul 120-752South Korea

AIM:To investigate perfusion change in contrastenhanced ultrasonography(CEUS) to evaluate liver fibrosis based on biliary obstruction using an animal ***:New Zealand white rabbits(3-4 kg) underwent bile duct ligation to form a biliary obstruction *** performed liver CEUS and laboratory tests on the day before the operation(day 0) and every 7 postoperative days until the rabbits were *** CEUS,signal intensity of liver parenchyma with a time-intensity curve was *** parameters were automatically calculated from regionof-interests,including peak signal intensity,mean transit time,area under the curve and time to *** grades of liver fibrosis were assessed according to the Metavir score system immediately after *** estimating equations were used to analyze the association between liver fibrosis grades and perfusion parameters for statistical *** perfusion parameters were measured on the last day and the difference between day 0 and the last day were ***:From the nine rabbits,histological grades of liver fibrosis were grade 1 in one rabbit,grade 2 and 3 in three rabbits each,and grade 4 in two *** the four CEUS parameters,only the peak signal intensity measured on the last day demonstrated a significant association with liver fibrosis grades(OR =1.392,95%CI:1.114-1.741,P =0.004).The difference in peak signal intensity between day 0 and the last dayalso demonstrated an association with liver fibrosis(OR =1.191,95%CI:0.999-1.419,P =0.051).The other parameters tested,including mean transit time,area under the curve,and time to peak,showed no significant correlation with liver fibrosis ***:This animal study demonstrates that CEUS can be used to evaluate liver fibrosis from biliary obstruction using peak signal intensity as a parameter.

关键词： Ultrasonography Contrast enhanced ultrasound Liver

Overexpression of Arabidopsis YUCCA6 in Potato Results in High-Auxin Developmental Phenotypes and Enhanced Resistance to Water Deficit

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Molecular Plant 2013年第2期6卷 337-349页

作者： Jeong Im Kim Dongwon Baek Hyeong Cheol Park hyun Jin Chun Dong-Ha Oh Min Kyung Lee Joon-Yung Cha Woe-Yeon Kim Min Chul Kim Woo Sik Chung Hans J. Bohner Sang Yeol Lee Ray A. Bressan shin-Woo Lee Dae-Jin Yun Department of Biochemistry Purdue University West Lafayette IN 47907 USA Division of Applied Life Science (BK21 and WCU Program) Plant Molecular Biology and Biotechnology Research Center Gyeongsang National UniversityJinju 660-701 Republic of Korea Department of Plant Biology University of Illinois at Urbana-Champaign Urbana IL USA Department of Agronomy and Medicinal Plant Resources Gyeongnam National University of Science and Technology Jinju 660-758 Korea Faculty of Science King Abdulaziz University Jeddah 21589 KSA Department of Horticulture Purdue University West Lafayette IN 47907 USA

Indole-3-acetic acid （IAA）, a major plant auxin, is produced in both tryptophan-dependent and tryptophan-independent pathways. A major pathway in Arabidopsis thaliana generates IAA in two reactions from tryptophan. Step one converts tryptophan to indole-3-pyruvic acid （IPA） by tryptophan aminotransferases followed by a rate-limiting step converting IPA to IAA catalyzed by YUCCA proteins. We identified eight putative StYUC （Solanum tuberosum YUCCA） genes whose deduced amino acid sequences share 50%-70% identity with those of Arabidopsis YUCCA proteins. All include canonical, conserved YUCCA sequences： FATGY motif, FMO signature sequence, and FAD-binding and NADP-binding sequences. In addition, five genes were found with -50% amino acid sequence identity to Arabidopsis trypto-phan aminotransferases. Transgenic potato （Solanum tuberosum cv. Jowon） constitutively overexpressing Arabidopsis AtYUC6 displayed high-auxin phenotypes such as narrow downward-curled leaves, increased height, erect stature, and longevity. Transgenic potato plants overexpressing AtYUC6 showed enhanced drought tolerance based on reduced water loss. The phenotype was correlated with reduced levels of reactive oxygen species in leaves. The results suggest a func-tional YUCCA pathway of auxin biosynthesis in potato that may be exploited to alter plant responses to the environment.

关键词： Solanum tuberosum potato Arabidopsis thaliana yuc6-1D YUCCA, StYUCCA, StTAA, auxin, drought.

Pretreated quercetin protects gerbil hippocampal CA1 pyramidal neurons from transient cerebral ischemic injury by increasing the expression of antioxidant enzymes

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Neural Regeneration Research 2017年第2期12卷 220-227页

作者： Bai Hui Chen Joon Ha Park Ji Hyeon Ahn Jeong Hwi Cho In Hye Kim Jae Chul Lee Moo-Ho Won Choong-hyun Lee In Koo Hwang Jong-Dai Kim Il Jun Kang Jun Hwi Cho Bich Na shin Yang Hee Kim Yun Lyul Lee Seung Min Park Department of Histology and Embryology Institute of NeuroscienceWenzhou Medical UniversityWenzhouZhejiang ProvinceChina Department of Biomedical Science and Research Institute for Bioscience and Biotechnology Hallym UniversityChuncheonSouth Korea Department of Neurobiology School of MedicineKangwon National UniversityChuncheonSouth Korea Department of Pharmacy College of PharmacyDankook UniversityCheonanSouth Korea Department of Anatomy and Cell Biology College of Veterinary Medicineand Research Institute for Veterinary ScienceSeoul National UniversitySeoulSouth Korea Division of Food Biotechnology School of BiotechnologyKangwon National UniversityChuncheonSouth Korea Department of Food Science and Nutrition Hallym UniversityChuncheonSouth Korea Department of Emergency Medicine School of MedicineKangwon National UniversityChuncheonSouth Korea Department of Physiology College of Medicineand Institute of Neurodegeneration and NeuroregenerationHallym UniversityChuncheonSouth Korea Department of Surgery School of MedicineKangwon National UniversityChuncheonSouth Korea Department of Emergency Medicine Sacred Heart HospitalCollege of MedicineHallym UniversityAnyangSouth Korea

Quercetin（QE; 3,5,7,3′,4′-pentahydroxyflavone）, a well-known flavonoid, has been shown to prevent against neurodegenerative disorders and ischemic insults. However, few studies are reported regarding the neuroprotective mechanisms of QE after ischemic insults. Therefore, in this study, we investigated the effects of QE on ischemic injury and the expression of antioxidant enzymes in the hippocampal CA1 region of gerbils subjected to 5 minutes of transient cerebral ischemia. QE was pre-treated once daily for 15 days before ischemia. Pretreatment with QE protected hippocampal CA1 pyramidal neurons from ischemic injury, which was confirmed by neuronal nuclear antigen immunohistochemistry and Fluoro-Jade B histofluorescence staining. In addition, pretreatment with QE significantly increased the expression levels of endogenous antioxidant enzymes Cu/Zn superoxide dismutase, Mn superoxide dismutase, catalase and glutathione peroxidase in the hippocampal CA1 pyramidal neurons of animals with ischemic injury. These findings demonstrate that pretreated QE displayed strong neuroprotective effects against transient cerebral ischemia by increasing the expression of antioxidant enzymes.

关键词： nerve regeneration flavonoids transient cerebral ischemia Cu/Zn superoxide dismutase catalase Mn superoxide dismutase glutathione peroxidase neural regeneration

Glehnia fittoralis Extract Promotes Neurogenesis in the Hippocampal Dentate Gyrus of the Adult Mouse through Increasing Expressions of Brain-Derived Neurotrophic Factor and Tropomyosin-Related Kinase B

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Chinese Medical Journal 2018年第6期131卷 689-695页

作者： Joon Ha Park Bich Na shin Ji Hyeon Ahn Jeong Hwi Cho Tae-Kyeong Lee Jae-Chul Lee Yong Hwan Jeon II Jun Kang Ki-Yeon Yoo In Koo Hwang Choong hyun Lee Yoo Hun Noh Sung-Su Kim Moo-Ho Won Jong Dai Kim Department of Biomedical Science and Research Institute for Bioscience and Biotechnology Hallym University Chuncheon 24252 Korea Department of Neurobiology School of Medicine Kangwon National University Chuncheon 24341 Korea Department of Radiology School of Medicine Kangwon National University Chuncheon 24341 Korea Department of Food Science and Nutrition Hallym University Chuncheon 24252 Korea epartment of Oral Anatomy College of Dentistry and Research Institute of Oral Biology Gangneung-Wonju National University Gangneung 25457 Korea Department of Anatomy and Cell Biology College of Veterinary Medicine and Research Institute for Veterinary Science Seoul National University Seou108826 Korea Department of Pharmacy College of Pharmacy Dankook University Cheonan 31116 Korea Famenity Biomedical Research Center Famenity Inc. Gyeonggi 13837 Korea Division of Food Biotechnology School of Biotechnology Kangwon National University Chuncheon 24341 Korea

Background： Glehnia littoralis has been used for traditional Asian medicine, which has diverse therapeutic activities. However, studies regarding neurogenic effects of G. littoralis have not yet been considered. Therefore, in this study, we examined effects of G. littoralis extract on cell proliferation, neuroblast differentiation, and the maturation of newborn neurons in the hippocampus of adult mice. Methods： A total of 39 male ICR mice （12 weeks old） were randomly assigned to vehicle-treated and 100 and 200 mg/kg G. littoralis extract-treated groups （n = 13 in each group）. Vehicle and G. littoralis extract were orally administrated for 28 days. To examine neurogenic effects ofG. litmralis extract, we performed immunohistochemistry tbr 5-bromo-2-deoxyuridine （BrdU, an indicator for cell proliferation） and doublecortin （DCX, an immature neuronal marker） and double immunofluorescence staining for BrdU and neuronal nuclear antigen （NeuN, a mature neuronal marker）. In addition, we examined expressional changes of brain-derived neurotrophic factor （BDNF） and its major receptor tropomyosin-related kinase B （TrkB） using Western blotting analysis. Results： Treatment with 200 mg/kg, not 100 mg/kg, significantly increased number of BrdU-immunoreactive （＋） and DCX＋ cells （48.0 ±3.1and 72.0 ± 3.8 cells/section, respectively） in the subgranular zone （SGZ） of the dentate gyrus （DG） and BrdU＊/NeuN＋ cells （17.0 ±1.5 cells/section） in the granule cell layer as well as in the SGZ. In addition, protein levels of BDNF and YrkB （about 232% and 244% of the vehicle-treated group, respectively） were significantly increased in the DG of the mice treated with 200 mg/kg ofG. littoralis extract. Conclusion： G. littoralis extract promots cell proliferation, neuroblast differentiation, and neuronal maturation in the hippocampal DG, and neurogenic effects might be closely related to increases ofBDN F and TrkB proteins by G. littoralis extract treatment.

关键词： Brain-Derived Neurotrophic Factor CellProliferation Glehnia littoralis Neuroblast Differentiation Tropomyosin-Related Kinase B

Ethanol extract of Oenanthe javanica increases cell proliferation and neuroblast differentiation in the adolescent rat dentate gyrus

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Neural Regeneration Research 2015年第2期10卷 271-276页

作者： Bai Hui Chen Joon Ha Park Jeong Hwi Cho In Hye Kim Bich Na shin Ji Hyeon Ahn Seok Joon Hwang Bing Chun Yan hyun Jin Tae Jae Chul Lee Eun Joo Bae Yun Lyul Lee Jong Dai Kim Moo-Ho Won Il Jun Kang Department of Physiology College of Medicine and Institute of Neurodegeneration and Neuroregeneration Hallym University Department of Neurobiology School of Medicine Kangwon National University Department of Food Science and Biotechnology College of Agriculture and Life Sciences Kangwon National University Department of Integrative Traditional & Western Medicine Medical College Yangzhou University Department of Biomedical Science and Research Institute for Bioscience and Biotechnology Hallym University Department of Pediatrics Chuncheon Sacred Heart Hospital College of Medicine Hallym University Department of Food Science and Nutrition Hallym University

Oenanthe javanica is an aquatic perennial herb that belongs to theOenanthe genus in Apiaceae family, and it displays well-known medicinal properties such as protective effects against glu-tamate-induced neurotoxicity. However, few studies regarding effects ofOenanthe javanica on neurogenesis in the brain have been reported. In this study, we examined the effects of a normal diet and a diet containing ethanol extract ofOenanthe javanica on cell proliferation and neu-roblast differentiation in the subgranular zone of the hippocampal dentate gyrus of adolescent rats using Ki-67 （an endogenous marker for cell proliferation） and doublecortin （a marker for neuroblast）. Our results showed thatOenanthe javanica extract signiifcantly increased the number of Ki-67-immunoreactive cells and doublecortin-immunoreactive neuroblasts in the subgranular zone of the dentate gyrus in the adolescent rats. In addition, the immunoreactivity of brain-derived neurotrophic factor was signiifcantly increased in the dentate gyrus of the Oenanthe javanica extract-treated group compared with the control group. However, we did not ifnd that vascular endothelial growth factor expression was increased in theOenanthe javanica extract-treated group compared with the control group. These results indicate thatOenanthe javanica extract improves cell proliferation and neuroblast differentiation by increasing brain-de-rived neurotrophic factor immunoreactivity in the rat dentate gyrus.

关键词： nerve regeneration Oenanthe javanica extract cell proliferation neuroblast differentiation brain-derived neurotrophic factor vascular endothelial growth factor rat neural regeneration

Neuronal injury and tumor necrosis factor-alpha immunoreactivity in the rat hippocampus in the early period of asphyxia-induced cardiac arrest under normothermia

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Neural Regeneration Research 2017年第12期12卷 2007-2013页

作者： hyun-Jin Tae Il Jun Kang Tae-Kyeong Lee Jeong Hwi Cho Jae-Chul Lee Myoung Cheol shin Yoon Sung Kim Jun Hwi Cho Jong-Dai Kim Ji Hyeon Ahn Joon Ha Park In-Shik Kim Hyang-Ah Lee Yang Hee Kim Moo-Ho Won Young Joo Lee Bio-Safety Research Institute College of Veterinary Medicine Chonbuk National University Iksan South Korea Department of Food Science and Nutrition Hallym University Chuncheon South Korea Department of Neurobiology School of Medicine Kangwon National University Chuncheon South Korea Department of Emergency Medicine School of Medicine Kangwon National University Chuncheon South Korea Department of Emergency Medicine Samcheok Medical Center Samcheok South Korea Division of Food Biotechnology School of Biotechnology Kangwon National University Chuncheon South Korea Department of Biomedical Science Research Institute of Bioscience and Biotechnology Hallym University Chuncheon South Korea Department of Obstetrics and Gynecology School of Medicine Kangwon National University Chuncheon South Korea Department of Surgery School of Medicine Kangwon National University Chuncheon South Korea Department of Emergency Medicine Seoul Hospital College of Medicine Sooncheonhyang University Seoul South Korea

Low survival rate occurs in patients who initially experience a spontaneous return of circulation after cardiac arrest（CA）. In this study, we induced asphyxial CA in adult male Sprague-Daley rats, maintained their body temperature at 37 ± 0.5°C, and then observed the survival rate during the post-resuscitation phase. We examined neuronal damage in the hippocampus using cresyl violet（CV） and Fluore-Jade B（F-J B） staining, and pro-inflammatory response using ionized calcium-binding adapter molecule 1（Iba-1）, glial fibrillary acidic protein（GFAP）, and tumor necrosis factor-alpha（TNF-α） immunohistochemistry in the hippocampus after asphyxial CA in rats under normothermia. Our results show that the survival rate decreased gradually post-CA（about 63% at 6 hours, 37% at 1 day, and 8% at 2 days post-CA）. Rats were sacrificed at these points in time post-CA, and no neuronal damage was found in the hippocampus until 1 day post-CA. However, some neurons in the stratum pyramidale of the CA region in the hippocampus were dead 2 days post-CA. Iba-1 immunoreactive microglia in the CA1 region did not change until 1 day postCA, and they were activated（enlarged cell bodies with short and thicken processes） in all layers 2 days postCA. Meanwhile, GFAP-immunoreactive astrocytes did not change significantly until 2 days post-CA. TNF-α immunoreactivity decreased significantly in neurons of the stratum pyramidale in the CA1 region 6 hours post-CA, decreased gradually until 1 day post-CA, and increased significantly again 2 days post-CA. These findings suggest that low survival rate of normothermic rats in the early period of asphyxia-induced CA is related to increased TNF-α immunoreactivity, but not to neuronal damage in the hippocampal CA1 region.

关键词： nerve regeneration post-cardiac arrest syndrome normothermia neuronal damage gliosis tumor necrosis factor-alpha neural regeneration

The Apoptotic Effect of the Methanol Extract of <i>Polygonum cuspidatum</i>through Up-Regulation Death Receptor 5 and CHOP in HSC-2 Human Oral Cancer Cells

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Journal of Cancer Therapy 2012年第1期3卷 1-6页

作者： hyun-Ju Yu Ji-Ae shin Eun-Sun Choi Jae-Gyu Jeon Nam-Pyo Cho Sung-Dae Cho Department of Oral Pathology School of Dentistry Institute of Oral Bioscience Chonbuk National University Jeonju South Korea

Polygonum cuspidatum is used as a traditional medicinal herb for the therapy of various diseases including several types of cancers. In the present study, we focused on addressing the anti-cancer activity and molecular mechanism of methanol extract of Polygonum cuspidatum (MEPC) in HSC-2 human oral cancer cells. The effect of MEPC on oral cancer cells was estimated by 3-(4,5-dimethylthiazol-20yl)-(3-carboxymethoxyphenyl)-2-(4-sulphophenyl)-2H-tetrazolium (MTS) assay, 4’-6-diamidino-2-phenylindole (DAPI) staining and Western blot analysis. MEPC inhibited the cell viability and induced apoptosis through the induction of death receptor (DR) 5. MEPC also increased the expression of C/EBP homologous protein/growth arrest and the DNA damage-inducible gene 153 (CHOP), a transcription factor induced by ER stress. Thus, we concluded that the induction of CHOP leading to DR5 up-regulation is required for the anti-cancer activity of MEPC in HSC-2 cells and MEPC may be a promising drug candidate for oral cancer.

关键词： Polygonum cuspidatum Endoplasmic Reticulum Stress C/EBP Homologous Protein/Growth Arrest and the DNA Damage-Inducible Gene 153 (CHOP) Death Receptor 5 (DR5) Apoptosis Human Oral Cancer Cell