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Clinical Characteristics of Acute Appendicitis in Kidney Transplant Recipients
Kwon, So Hyun,Park, Sung Hyun,Lee, Hwa Young,Ko, Eun Jeong,Ban, Tae Hyun,Chung, Byung Ha,Yang, Chul Woo International Scientific Literature, Inc. 2019 Annals of transplantation Vol.24 No.-
<P><B>Background</B></P><P>Clinical characteristics of acute appendicitis in kidney transplant recipients may be different from those in the general population due to kidney transplant recipient’s immunosuppressive state and position change of appendix caused by graft.</P><P><B>Material/Methods</B></P><P>Clinical characteristics of 10 cases of acute appendicitis among 2880 cases of kidney transplantation were evaluated, including diagnostic rate, location of appendix and complication in kidney transplant recipients.</P><P><B>Results</B></P><P>Acute appendicitis was suspected in 9 of 10 patients (90%) with acute appendicitis based on clinical and laboratory findings. Five patients (50%) presented with typical migrating pain and 1 patient (10%) had only periumbilical pain. Leukocytosis (WBC >10 000) was present in 8 patients (80%). Radiologic study revealed various locations of appendix relative to grafted kidney. Computed tomography scan was superior to ultrasonography in diagnosis of acute appendicitis. The complication rate was 50%. Complicated patients showed longer duration from symptoms onset to operation (69±48 hours versus. 25±6 hours, <I>P</I><0.05) and hospital stay (15.4±15 days versus 5.4±1.8 days, <I>P</I><0.05) than uncomplicated patients.</P><P><B>Conclusions</B></P><P>Clinical suspicion and differential diagnosis are needed for kidney transplantation patients with acute appendicitis. Early diagnosis with radiologic study is essential to reduce complications of acute appendicitis.</P>
Fabrication of Au-Decorated 3D ZnO Nanostructures as Recyclable SERS Substrates
Sung-Gyu Park,Tae Yoon Jeon,Hwan Chul Jeon,Jung-Dae Kwon,ChaeWon Mun,MinKyoung Lee,Byungjin Cho,Chang Su Kim,Myungkwan Song,Dong-Ho Kim IEEE 2016 IEEE SENSORS JOURNAL Vol.16 No.10
<P>Highly roughened Au-decorated 3D ZnO nanostructures were prepared using a combination of prism holographic lithography and atomic layer deposition techniques. Prism holographic lithography is a simple and rapid method for fabricating ordered 3D nanostructures using the optical interference effects of multiple beams derived from a specially designed prism. Highly ordered reproducible surface-enhanced Raman scattering (SERS) substrates are needed for the reliable calibration of target analyte concentrations. A high density of Au nanoparticles separated by nanoscale gaps was generated on the Au-coated ZnO inverse structures. The nanogaps may function as strong hot spots for highly sensitive SERS-based chemical/biological sensors. The optimized SERS intensity from the prepared Au-coated 3D ZnO inverse structures was 20 times the intensity obtained from an Au-coated flat glass control substrate. The surfaces could be reused after the photocatalytic degradation and removal of adsorbates in the presence of ZnO. The Au-coated 3D ZnO structures described here offer an alternative to traditional single-use SERS substrates.</P>
Kwon, Hyun Woo,Kim, Jong Phil,Lee, Hong Jae,Paeng, Jin Chul,Lee, Jae Sung,Cheon, Gi Jeong,Lee, Dong Soo,Chung, June-Key,Kang, Keon Wook The Korean Academy of Medical Sciences 2016 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.31 No.1
<P>The purpose of this study was to estimate average radiation exposure from <SUP>18</SUP>F-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) examinations and to analyze possible factors affecting the radiation dose. A nation-wide questionnaire survey was conducted involving all institutions that operate PET/CT scanners in Korea. From the response, radiation doses from injected FDG and CT examination were calculated. A total of 105 PET/CT scanners in 73 institutions were included in the analysis (response rate of 62.4%). The average FDG injected activity was 310 ± 77 MBq and 5.11 ± 1.19 MBq/kg. The average effective dose from FDG was estimated to be 5.89 ± 1.46 mSv. The average CT dose index and dose-length product were 4.60 ± 2.47 mGy and 429.2 ± 227.6 mGy∙cm, which corresponded to 6.26 ± 3.06 mSv. The radiation doses from FDG and CT were significantly lower in case of newer scanners than older ones (<I>P</I> < 0.001). Advanced PET technologies such as time-of-flight acquisition and point-spread function recovery were also related to low radiation dose (<I>P</I> < 0.001). In conclusion, the average radiation dose from FDG PET/CT is estimated to be 12.2 mSv. The radiation dose from FDG PET/CT is reduced with more recent scanners equipped with image-enhancing algorithms.</P>
Neuron-specific enolase as a novel biomarker reflecting tuberculosis activity and treatment response
( Sung Jin Nam ),( Jee Yeong Jeong ),( Tae Won Jang ),( Mann Hong Jung ),( Bong Kwon Chun ),( Hee Jae Cha ),( Chul Ho Oak ) 대한내과학회 2016 The Korean Journal of Internal Medicine Vol.31 No.4
Background/Aims: It is not clear which tests are indicative of the activity and severity of tuberculosis (TB). This study aimed to investigate the predictive value of neuron-specific enolase (NSE) and to determine the origin of NSE in TB patients. Methods: A single-center retrospective analysis was conducted on newly diagnosed TB patients between January and December 2010. Patients were categorized into one of two disease groups (focal segmental or extensive) based on chest X-ray. Pre- and post-treatment NSE concentrations were evaluated. To determine the origin of serum NSE concentration, NSE staining was compared with macrophage- specific CD68 staining in lung tissues and with a tissue microarray using immunohistochemistry and immunofluorescence. Results: A total of 60 newly diagnosed TB patients were analyzed. In TB patients, NSE serum concentration was significantly increased and NSE level decreased after treatment (p < 0.001). In proportion to serum high-sensitivity C-reactive protein concentration, the mean serum concentration of NSE in the extensive group 25.12 ng/mL) was significantly higher than that in the focal segmental group 20.23 ng/mL, p = 0.04). Immunohistochemical staining revealed a large number of macrophages that stained positively for both NSE and CD68 in TB tissues. In addition, NSE signals mostly co-localized with CD68 signals in the tissue microarray of TB patients. Conclusions: Our results suggest that NSE may be a practical parameter that can be used to monitor TB activity and treatment response. Elevated serum NSE level originates, at least in part, from macrophages in granulomatous lesions.
Selective Catalytic Reduction of NO with NH<sub>3</sub> Over V-MCM-41 Catalyst
Kwon, Woo Hyun,Park, Sung Hoon,Kim, Ji Man,Park, Su Bin,Jung, Sang-Chul,Kim, Sang Chai,Jeon, Jong-Ki,Park, Young-Kwon American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.2
<P>V-MCM-41, a mesoporous catalyst doped with V2O5, was applied for the first time to the removal of atmospheric NO. The quantity of V2O5 added was 10 wt% and 30 wt%. The characteristics of the synthesized catalysts were examined using XRD, N-2 soprtion, and NH3-TPD. With increasing quantity of V2O5 added, specific surface area decreased and pore size increased. When the quantity of V2O5 was 10 wt%, the MCM-41 structure was retained, whereas considerable collapse of mesoporous structure was observed when 30 wt% V2O5 was added. The examination of acid characteristics using NH3-TPD showed that 30 wt% V-MCM-41 had the higher NH3 adsorption ability, implying that it would exhibit high activity for NH3 SCR reaction. In the NO removal experiments, 30 wt% V-MCM-41 showed much higher NO removal efficiency than 10 wt% V-MCM-41, which was attributed to its high NH3 adsorption ability.</P>
Distribution patterns of Monochamus alternatus and M. saltuarius (Coleoptera: Cerambycidae) in Korea
Kwon, Tae-Sung,Lim, Jong-Hwan,Sim, Sang-Jun,Kwon, Young-Dae,Son, Sung-Kil,Lee, Kooi-Yong,Kim, Yeon-Tae,Park, Ji-Won,Shin, Chang-Hoon,Ryu, Seok-Bong,Lee, Chong-Kyu,Shin, Sang-Chul,Chung, Yeong-Jin,Park Korean Society of Forest Science 2006 한국산림과학회지 Vol.95 No.5
Distribution patterns of two pine sawyer species (Monochamus alternatus which is the main vector insect and M. saltuarius which is the potential insect vector of the pine wood nematode) were investigated in Korea. The data were collected at 89 study sites which were chosen to cover the whole region of South Korea. The selected pine trees were killed in early April and left for I year in the pine stands to be egg-laid by the pine sawyers. Emergence of the beetles from the dead pine trees was checked from early April to late July. M. saltuarius was the most abundant in the mid to northern areas of South Korea, whereas M. alternatus in Jeju-do, southernmost island of Korea. Considering temperature distribution patterns in areas where the two species occur, their thermal distribution boundary may be formed around $13.2^{\circ}C$ of annual mean temperature. The hypothesized distribution map of the two Monochamus species under the invasion of pine wilt disease is suggested on the base of thermal distribution of Korean peninsula.
Fabric Active Transducer Stimulated by Water Motion for Self-Powered Wearable Device
Kwon, Soon-Hyung,Kim, Won Keun,Park, Junwoo,Yang, YoungJun,Yoo, Byungwook,Han, Chul Jong,Kim, Youn Sang American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.37
<P>The recent trend Of energy-harvesting devices is an adoption of fabric materials with flexible and stretchable according to the increase of wearable electronics. But it is a difficult process to form a core structure of dielectric layer or electrode on fabric materials. In particular, a fabric-based energy-harvesting device in contact with water has not been studied, though there are many challenging issues including insulation and water absorption in a harsh environment. So we propose an, effective method to-obtain an electrical energy froin the water contact using our new fabric energy harvesting device. Our water motion active transducer (WMAT) is designed to obtain electrical energy from the variable capacitance through the movement and contact of water droplet. In this paper, we succeeded in generating an electrical energy with peak to peak power of 280 mu W using a 30 mu L of water droplet with the fabric WMAT device of 70 mm x SO mm dimension. Furthermore, we specially carried out spray-coating and transfer processes instead of the conventional spin-coating process on fabric materials to overcome the limitation of its uneven morphology and porous and deformable assembly.</P>