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Surface Imaging of Barley Aleurone Cell by Atomic Force Microscopy
Kwang-Woon Huh,Seung-Hwan Kim,Hyun-Hwoi Ku,Byung-Moo Lee,Jae Yoon Kim,Yong-Won Seo,Tae Wan Kim 韓國作物學會 2004 한국작물학회지 Vol.49 No.1
To observe and analysis ultra-microscopically barley aleurone cell surface, atomic force microscope (AFM) was used. Seed coat of early maturing germplasm, eam9, was dehulled and scanned by non-contact mode. We have obtained the high resolution topographic 3-dimensional image of barley aleurone layer with high resolution. These images showed the membrane proteins in barley aleurone cell. One channel protein and numerous peripheral or integral proteins were detected in a area of 100 ~mu~textrmm2 . Furthermore, we found that their widths were ranged from 50 to 750nm and lengths from 0 to 66 ~mu~textrmm . The thickness of aleurone layer was measured by scanning electron microscope. The thickness at early developmental stage was about 16 and then the aleurone cell enlarged upto 57 ~mu~textrmm ~mu~textrmm at least until 42 days after anthesis. In this study, we firstly reported on the ultrastructural AFM analysis of living aleurone cell as a biological specimen. It was clearly suggested that AFM will become an powerful tool for probing both the structural properties of biological samples
Hydroxyl Groups in Demineralized Bone Matrix
Seo, Seog Jin,Song, Seok Beom,Chae, Ji Hwa,Kim, Jin Young,Ahn, Jae Hyoung,Kim, Tae Woon,Hwang, Ho Chan,Kim, Jin,Lee, Kwang Won,Kang, Nak Heon,Cho, Chong Su,Kang, Ke Won Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.342-343 No.-
<P>Human demineralized bone matrix (DBM) containing bone morphogenetic proteins (BMPs) is naturally biocompatible and can be remodeled by patients’ own bone. The major shortcoming of many of the currently used DBM gel formulations is that they have a tendency to flow, particularly if there is continuous bleeding at the application site. In this study, the physicochemical properties of human DBM were examined to improve the efficiency of DBM formulations. DBM remarkably showed higher water absorption than nondemineralized bone powder after 150 min. Hydroxyl groups in DBM appeared in fourier transform infrared analysis, although hydroxyl band in nondemineralized bone powder was not observed. The results suggested that hydrogels such as CMC, hyaluronic acid, or poloxamer as carriers can be applied for injectable DBM products, such as gel or putty types.</P>
Prevalence of antimicrobial resistance in Escherichia coli isolated from poultry in Korea
Kwang Won Seo,Young Ju Lee 한국예방수의학회 2018 예방수의학회지 Vol.42 No.3
Poultry play an important role in meeting the protein demand through the supply of chicken meat and eggs, and antimicrobial-resistant bacteria can be transmitted from poultry to humans through the food chain. In this study, 716 E. coli isolates were collected from poultry industry in Korea during the period from 2016-2018. Among the cephalosporin antimicrobial, the rate of resistance to first-cephalosporins (cefazolin and cephalexin) was more than 18.0% but secondcephalosporins (cefoxitin and cefuroxime) and four-cephalosporins (cefepime) was less than 10.0%, without any differences based on the poultry. In quinolone antimicrobial, the rate of resistance to nalidixic acid was more than 46.0% in all poultry but ciprofloxacin was more than 44.0% in broiler farm and chicken meat and less than 18.0% in layer farm and egg. In addition, the rate of resistance to ampicillin and tetracycline was more than 30.0% without any differences in poultry, but the rate of resistance to amoxicillin - clavulanate, trimethoprim - sulfamethoxazole, imipenem and gentamicin was higher in broiler farm and chicken meat than in layer farm and egg. MDR was detected in 120 (60.6%), 113 (79.6%), 80 (37.0%), and 75 (46.9%) isolates from broiler farm, chicken meat, layer farm, and egg, respectively, with an overall prevalence of 54.2% (388/716).
Motor-intentional Disorders in Right Hemisphere Stroke
Seo, Sang Won,Jung, Kihyo,You, Heecheon,Lee, Byung Hwa,Kim, Gyeong-Moon,Chung, Chin-Sang,Lee, Kwang Ho,Na, Duk L. Lippincott Williams Wilkins, Inc. 2009 COGNITIVE AND BEHAVIORAL NEUROLOGY Vol.22 No.4
OBJECTIVE: Damage to premotor and prefrontal regions results in motor-intentional disorders (MIDs) that disrupt initiation, maintenance, and termination of volitional movements. MIDs more frequently occur in right hemisphere rather than in left hemisphere injury. The aim of this study was to evaluate the prevalence of MIDs in patients with right hemisphere stroke and the factors that have influence on MIDs. METHODS: Subjects consisted of 25 consecutive patients with right hemisphere stroke and 12 normal controls. They underwent a series of experiments using force dynamometer along with bedside examination. RESULTS: It was identified that the force control test screened for MIDs with a higher sensitivity than bedside examinations: motor akinesia (38% vs. 11%), motor impersistence (50% vs. 10%), and motor perseveration (47% vs. 25%). The patients were significantly inferior to the controls in terms of force control capabilities in the 4 force control phases (1.6 to 16.3 times). The location and area of lesion and space of force production were not related to the severity of MIDs whereas the presence of neglect was related to the severity of MIDs. CONCLUSIONS: Our results suggest force dynamometer is a sensitive method to detect MIDs and the presence of neglect may influence the frequency of MIDs.
Graphene-based crack lithography for high-throughput fabrication of terahertz metamaterials
Won, Sejeong,Jung, Hyun-June,Kim, Dasom,Lee, Sang-Hun,Van Lam, Do,Kim, Hyeon-Don,Kim, Kwang-Seop,Lee, Seung-Mo,Seo, Minah,Kim, Dai-Sik,Lee, Hak-Joo,Kim, Jae-Hyun Elsevier 2020 Carbon Vol.158 No.-
<P><B>Abstract</B></P> <P>Terahertz (THz) nanoantennas have significant potential for versatile applications in THz spectroscopy because of their capability for strong electromagnetic field localization. Electron-beam lithography or focused ion beam machining is typically employed to fabricate nanoantenna structures. These nanolithography methods present limitations in the widespread utilization of THz nanoantennas because of their high cost and low productivity. In this work, we proposed graphene-based crack lithography as a high throughput fabrication method for nanoantenna structures. A double-layer graphene interface was introduced to enable independent control of the nanoantenna dimensions and provide graphene-based nanoantenna structures. We analyzed the underlying mechanism of graphene-based cracking and developed an analytical model governing the geometric parameters of the fabricated nanostructures. As a vital application of the fabricated nanoantenna structures, we demonstrated the highly sensitive detection of <SMALL>D</SMALL>-Glucose molecules. Graphene-based crack lithography can provide a cost-effective method for generating nanoantenna structures with the desired characteristics and can accelerate the development of practical applications of electromagnetic metamaterials.</P> <P><B>Graphical abstract</B></P> <P>Nanoantennas of various materials with desired terahertz resonance characteristics can be readily manufactured on a large scale using the graphene-based crack lithography.</P> <P>[DISPLAY OMISSION]</P>
Random Block-Based Video Watermarking of H.264/SVC
Won Jei Kim,Kwang-Seok Moon,MD Abul Bashar,Young-Ho Ahn,Suk-Hwan Lee,Yong-Su Seo,Ki-Ryong Kwon 한국멀티미디어학회 2008 한국멀티미디어학회 국제학술대회 Vol.2008 No.-
In this paper, we proposed random block-based video watermarking of H.264/SVC(scalable video coding). In proposed scheme, the embedding of watermark is performed in H.264/SVC encoder. Our scheme use the block that is decided by length of the watermark and size of the video frame. And then the block randomly selected by random position key. With the proposed method, the video watermarking scheme can achieve high robustness and good visual quality without increasing the overall bit-rate. Experimental results show that our scheme can robustly survive encoding, common signal processing and geometrical processing.
P-GaN Gated AlGaN/GaN E-mode HFET Fabricated with Selective GaN Etching Process
Won-Ho Jang,Kwang-Seok Seo,Ho-Young Cha 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.6
An O₂ based selective GaN etching process was developed herein for use in p-GaN gated AlGaN/GaN heterojunction field-effect transistor fabrication, where precise control of the p-GaN etching was an important process step that determined the device characteristics. The p-GaN layer was etched by a two-step process: low damage BCl₃/Cl₂ plasma etching in conjunction with Cl₂/N₂/O₂ based selective etching. A high selectivity of 53:1 for the p-GaN:AlGaN was achieved by the Cl₂/N₂/O₂ plasma etching. The device fabricated by the optimized etching process exhibited excellent enhancement-mode characteristics, i.e., a threshold voltage of 2.45 V, a specific on-resistance of 5.55 mΩ·cm², an on/off ratio of ~10<SUP>9</SUP>, and an off-state breakdown voltage of >1100 V.