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Dong Youl Lee,Howard Kim,Ji Hong Cheon,Na Na Lim,Hyun Kyung Lee,Youn Kyung Cho,Sung Hoon Lee 대한연하장애학회 2017 대한연하장애학회지 Vol.7 No.2
A 63-year-old man visited outpatient clinic complaining of dysphagia due to left jugular foramen meningioma. The patient underwent conventional dysphagia rehabilitation programs but functional improvement was not enough. A videofluoroscopic swallowing study (VFSS) revealed decreased laryngeal elevation and a lot of residue in pyriform sinus and vallecula. We noticed that enhancing laryngeal elevation like mendelshon maneuver promotes functional compensation, so we developed a therapeutic band for promoting laryngeal elevation. In follow-up VFSS, swallowing function was improved on the band. Persistent dysphagia due to decreased laryngeal elevation is very common and this case showed the possibility of improvement of symptom using therapeutic band we devleoped with conventional dysphagia rehabilitation programs.
Fabrication and characterization of the magnetic ferrite nanofibers by electrospinning process
Na, Kyeong-Han,Kim, Wan-Tae,Park, Dong-Cheol,Shin, Hyun-Gyoo,Lee, Sea-Hyun,Park, Jisun,Song, Tae-Hyeob,Choi, Won-Youl Elsevier 2018 THIN SOLID FILMS - Vol.660 No.-
<P><B>Abstract</B></P> <P>Since the magnetic properties of materials are greatly affected by their microstructure, nanostructuring of magnetic materials is attempted in various directions. Various processes have been used to synthesis one dimensional nanomaterials: template, hydrothermal, anodizing, and electrospinning. Among these processes, nanofibers fabricated by the electrospinning method are excellent for reproducibility and have a large aspect ratio. In addition, there have been many attempts to fabricate ceramic nanofibers with a more intricate shape using a sol-gel reaction. In this study, the electrospinning conditions for synthesizing ferrite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) nanofiber were optimized by the preliminary results of polyvinyl alcohol (PVA) nanofiber. As-spun composite nanofibers of PVA/Fe(NO<SUB>3</SUB>)<SUB>3</SUB>·9H<SUB>2</SUB>O were transformed to an α-Fe<SUB>2</SUB>O<SUB>3</SUB> phase by heat treatment at 550 °C. After heat treatment, the diameters ranged from 105 nm to 124 nm in as-spun composite nanofibers, and with a decrease in PVA content after heat treatment, the diameters ranged from 59 nm to 96 nm. We investigated the magnetization properties with the microstructure of α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanofiber by a vibrating sample magnetometer. The saturation magnetization increased with an increasing diameter of the α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanofiber, and highest value of 26.2 A·m<SUP>2</SUP>/kg was measured in the α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanofibers with the largest diameter with a PVA content of 0.12 g/ml. The microstructure and magnetic properties of the α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanofibers were controlled by an electrospinning process, and we were able to optimize the α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanofibers for various application fields, such as electromagnetic interference and electromagnetic pulse absorbers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electrospinning process to control the microstructure of nanofibers </LI> <LI> Synthesis of α-Fe2O3 nanofibers using ferric nitrate and heat treatment. </LI> <LI> Magnetization behavior of α-Fe2O3 nanofibers with change of average diameter. </LI> <LI> Increased diameter of α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanofibers resulted in higher saturation magnetization. </LI> </UL> </P>
Crystal structure and its proposed nucleolytic site of the single domain catalytic antibody 3D8-VH
Suk-Youl Park,Bo-Na Kim,Dong-Ki Choi,Pil-Won Seo,Do-Heon Gu,Yong-Sung Kim,Jeong-Sun Kim 한국구조생물학회 2016 Biodesign Vol.4 No.1
Catalytic antibodies are monoclonal antibodies with catalytic activities. An anti-DNA antibody can bind DNA and hydrolyze it with modest catalytic activity. The monoclonal antibody 3D8 from the autoimmune-disease prone MRL-lpr/lpr mouse has been used to make a recombinant single-chain variable-fragment antibody (3D8 scFv) that hydrolyzes DNA. The catalytic site is composed of several hyper-variable loops. Two His residues from the variable domains of the heavy chain (VH) and the light chain (VL) are responsible for DNA hydrolysis. Interestingly, two single domain antibodies derived from 3D8 scFv, called 3D8-VH and 3D8-VL, also bind and hydrolyze DNA although their activities are significantly lower than those of 3D8 scFv. Here, we report the crystal structure of 3D8-VH, which revealed no significant difference compared to the VH domain from 3D8 scFv. The 3D8-VH antibody is also structurally very similar to 3D8-VL that has a catalytic metal ion on the newly exposed surface-curvature. The observed structural features of 3D8-VH, along with the fact that it retained catalytic activity when the His residue that was catalytic in the 3D8 scFv was replaced, suggest that 3D8-VH also has its DNA binding and cleavage activity on the newly exposed surface. These findings provide new insights into substrate recognition and catalysis by single domain anti-DNA antibodies.
원예프로그램이 정신지체인의 적응기술에 미치는 효과에 관한 연구
최영열 ( Young Youl Choi ),김동주 ( Dong Joo Kim ),나운환 ( Woon Hwan Na ) 대구대학교 한국특수교육문제연구소 2006 특수교육저널 : 이론과 실천 Vol.7 No.4
The purpose of this study was to examine the effectiveness of adaptive skills by evaluating ‘Horticultural Program’ mentally retarded adults attended in a vocation rehabilitation organization. The study occurred from February and May 2006 on a weekly basis. To quantify the effects of the program on adaptive skills, experiment and control groups were evaluated in adaptive behavior using the statistical analyses: Mann-Whitney U test, and Wilcoxon test. Some effects that were not tested with statistical analyses were separately recorded. As compared to control groups, experiment groups had a higher value in Independent Function, Economic Activity, Numbers and Time, Domestic Activity, Prevocational/Vocational Activity, Self-direction, Responsibility, and Socialization. There were no significant differences between experiment groups and controls in Physical Development and Language Development. According to case studies, groups attended ‘Horticultural Program’ showed higher self-esteem and improved skills to express themselves in a proactive way. The experiment and case studies provided evidence that ‘Horticultural Program’ was valuable in improving the adaptive skills of mentally retarded adults. This program is also worthy of clinical applicatio.
나민균,최승열,김동희,김진표,이찬복,김경동,Na, Min-Kyun,Choi, Seung-Youl,Kim, Dong-Hee,Kim, Jin-Pyo,Lee, Chan-Bok,Kim, Kyung-Dong 대한한방피부미용학회 2005 대한한방피부미용학회지 Vol.1 No.1
(1) Objectives: To discover natural skin-lightening agents, we have evaluated the inhibitory activity of EtOH extracts from 20 medicinal plants against mushroom tyrosinase. (2) Methods: Tyrosinase activity was determined by the dopachrome method using L-tyrosine as the substrates. (3) Results: Of the plant extracts tested, the extracts of 4 plants, Albizzia julibrissin, Curcuma longa, Anethum graveolens and Sophora flavescens, exhibited potent inhibitory activity (> 50%) in mushroom tyrosinase assay. Four plant extract, extracts of Agrimonia pilosa, Paeonia moutan, Magnolia obovata and Eugenia caryophyllata also showed relatively strong inhibitory (> 40%) against mushroom tyrosinase. (4) Conclusion: These active medicinal plants may be useful for the development of skin-whitening agents. Since the active medicinal plants may contain effective tyrosinase inhibitors even more than kojic acid, further study to identify the active constituents from the plants is expected.
Anthocyanins in Cowpea [Vigna unguiculata (L.) Walp. ssp. unguiculata]
Tae Joung Ha,Myoung-Hee Lee,Yu Na Jeong,Jin Hwan Lee,Sang-Ik Han,Chang-Hwan Park,Suk-Bok Pae,Chung-Dong Hwang,In-Youl Baek,Keum-Yong Park 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.3
The aim of this study was to isolate and identify the anthocyanins in the black seed coated cowpea [Vigna unguiculata (L.) Walp. ssp. unguiculata] using reverse phase C-18 open column chromatography and high performance liquid chromatography (HPLC) with diode array detection and electro spray ionization/mass spectrometry (DAD-ESI/MS) analysis, respectively. Anthocyanins were extracted from the coat of black cowpea with 1%trifluoroacetic acid (TFA) in methanol, isolated by RP-C-18 column chromatography, and their structures elucidated by 1D and 2D nuclear magnetic resonance (NMR)spectroscopy. The isolated anthocyanins were characterized as delphinidin-3-O-glucoside (2) and cyanidin-3-Oglucoside (4). Furthermore, 5 minor anthocyanins were detected and identified as delphinidin-3-O-galactoside (1),cyanidin-3-O-galactoside (3), petunidin-3-O-glucoside (5),peonidin-3-O-glucoside (7), and malvidin-3-O-glucoside (8) based on the fragmentation patterns of HPLC-DADESI/MS analysis.
LEEP으로 치료한 자궁 경부 상피내 종양에서 고위험 인유두종 바이러스 감염 및 절제면 병변여부의 의의
이상수,박은주,이동헌,남주현,김용만,김종열,김종혁,목정은,나준희,이주학,김영탁 대한부인종양 콜포스코피학회 1999 Journal of Gynecologic Oncology Vol.10 No.3
This study evaluated the degree and the frequency of cervical lesions after treatment with LEEP(loop electrosurgical excision procedure) in patients with abnormal Pap smears according to the presence or absence of high-risk HPV infection. From June 1994 to May 1997, eighty patients who showed CIN or chronic cervicitis on LEEP specimens were followed up with Pap smears. The histologic results and follow-up Pap smear data were analyzed. In all cases HPV test by Hybrid Capture assay was performed. Those with neoplastic lesion underwent follow-up Pap smears at least for 1 year with 3 month interval after LEEP. In HPV-positive group(N=38), 63.2% of the cases revealed neoplastic lesion(CIN) on final histologic evaluation, and in HPV-negative group(N=42) 54.8% of the cases did(p=0.26). HPV-positive group represented 25.0%(6/24) of abnormal Pap smear result on follow-up, which is higher than that of HPV-negative group(4.3%; 1/23), showing significant difference (p$lt;0.05). There was a significant difference in the rate of neoplastic lesion developed during follow-up between resection margin-positive group and resection margin-negative group on LEEP(p=0.04). Also, HPV-positive group had significantly higher chance to show abnormal Pap smear results during follow-up(p=0.02). In conclusion, HPV test and margin status were shown to be useful parameters to predict the recurrence or persistence of CIN lesion treated by LEEP.