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Real-time and label-free biosensing using moiré pattern generated by bioresponsive hydrogel

Bioactive Materials 2023年第5期23卷 383-393页

作者： Semin Kim Geehong Kim Yong Woo ji Chae-Eun Moon Yuna Jung hyung Keun Lee JaeJong Lee Won-Gun Koh Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul120-749Republic of Korea Korea Institute of Machinery&Materials Nano-Convergence Mechanical Systems Research Division156 Gajeongbuk-roYuseong-guDaejeon34103Republic of Korea Department of Ophthalmology Yongin Severance HospitalYonsei University College of Medicine363Dongbaekjukjeon-daeroGiheung-guYongin-siGyeonggi-do16995Republic of Korea Institute of Vision Research Department of OphthalmologyYonsei University College of Medicine50-1 Yonsei-roSeodaemun-guSeoul120-749Republic of Korea Department of Ophthalmology Graduate School of Medical ScienceBrain Korea 21 ProjectYonsei University College of MedicineRepublic of Korea College of Pharmacy Yonsei University85 Songdo Hwawak-roYeonsu-guIncheon26426Republic of Korea Department of Ophthalmology Gangnam Severance HospitalYonsei University College of Medicine211 Eonju-roGangnam-guSeoul06273Republic of Korea Department of Nanomechatronics University of Science and Technology217Gajeong-roYuseong-guDaejeon 34113Republic of Korea

Bioresponsive hydrogels are smart materials that respond to various external stimuli and exhibit great potential as biosensors owing to their capability of real-time and label-free ***,we propose a sensing platform based on bioresponsive hydrogels,employing the concept of moiré *** sets of line patterns with different pitch sizes are prepared;a hydrogel grating whose pitch size changes according to external stimuli and a reference grating with constant pitch *** volume changes of the hydrogel caused by external stimuli changes the pitch size of the hydrogel grating,and subsequently,the pitch sizes of the moiré patterns(moiré signal),whose values can be obtained in a real-time and label-free manner through customized moiré microscopy and signal *** confirming that the pH-induced swelling of hydrogel could be monitored using moiré patterns,we performed moiré pattern-based detection of specific proteins using protein-responsive hydrogel that underwent shrinking via interaction with target ***-derived neurotrophic factor and platelet-derived growth factor were selected as the model proteins,and our proposed system successfully detected both proteins at nanomolar *** both cases,the pitch size change of hydrogel grating was monitored much more sensitively using moiré patterns than through direct *** changes in the moiré signals caused by target proteins were detected in ex-vivo environments using a custom-made intraocular lens incorporating the hydrogel grating,demonstrating the capability of the proposed system to detect various markers in intraocular aqueous humor,when implanted in the eye.

关键词： Bioresponsive hydrogel Moirépattern Biosensing Intraocular lens Aqueous humor

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Is endoscopic ultrasonography essential for endoscopic resection of small rectal neuroendocrine tumors?

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World Journal of Gastroenterology 2017年第11期23卷 2037-2043页

作者： Su Bum Park Dong Jun Kim hyung Wook Kim Cheol Woong Choi Dae Hwan Kang Su jin Kim Hyeong Seok nam Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalYangsanGyeongsangnam-do 626-770South Korea

AIM To evaluate the importance of endoscopic ultrasonography(EUS) for small(≤ 10 mm) rectal neuroendocrine tumor(NET) *** Patients in whom rectal NETs were diagnosed by endoscopic resection(ER) at the Pusan National University Yangsan Hospital between 2008 and 2014 were included in this study. A total of 120 small rectal NETs in 118 patients were included in this study. Histologic features and clinical outcomes were analyzed, and the findings of endoscopy, EUS and histology were compared. RESULTS The size measured by endoscopy was not significantly different from that measured by EUS and histology(r = 0.914 and r = 0.727 respectively). Accuracy for the depth of invasion was 92.5% with EUS. No patients showed invasion of the muscularis propria or metastasis to the regional lymph nodes. All rectal NETswere classified as grade 1 and demonstrated an L-cell phenotype. Mean follow-up duration was 407.54 ± 374.16 d. No patients had local or distant metastasis during the follow-up periods. CONCLUSION EUS is not essential for ER in the patient with small rectal NETs because of the prominent morphology and benign behavior.

关键词： Neuroendocrine tumor Small Rectal Endoscopic ultrasonography Histology Endoscopy

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Enhanced third-harmonic generation by manipulating the twist angle of bilayer graphene

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Light(Science & Applications) 2021年第2期10卷 176-185页

作者： Seongju Ha nam Hun Park Hyeonkyeong Kim jiseon Shin Jungseok Choi Sungmin Park ji-Yun Moon Kwanbyung Chae Jeil Jung Jae-Hyun Lee Youngdong Yoo ji-Yong Park Kwang Jun Ahn Dong-Il Yeom Department of Energy Systems Research Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Korea Research Institute of Standards and Science Daejeon 34113Republic of Korea Department of Physics University of Seoul163 SiripdaeroDongdaemun-guSeoul 02504Republic of Korea Department of Smart Cities University of Seoul163 SiripdaeroDongdaemun-guSeoul 02504Republic of Korea Department of Materials Science and Engineering Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Department of Chemistry Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Department of Physics Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea

Twisted bilayer graphene(tBLG)has received substantial attention in various research fields due to its unconventional physical properties originating from Moire *** electronic band structure in tBLG modified by interlayer interactions enables the emergence of low-energy van Hove singularities in the density of states,allowing the observation of intriguing features such as increased optical conductivity and photocurrent at visible or near-infrared ***,we show that the third-order optical nonlinearity can be considerably modified depending on the stacking angle in *** third-harmonic generation(THG)efficiency is found to significantly increase when the energy gap at the van Hove singularity matches the three-photon resonance of incident *** study on electrically tuneable optical nonlinearity reveals that the gate-controlled THG enhancement varies with the twist angle in tBLG,resulting in a THG enhanced up to 60 times compared to neutral monolayer *** results prove that the twist angle opens up a new way to control and increase the optical *** tBLG,,suggesting rotation-induced tuneable nonlinear optics in stacked two-dimensional material systems.

关键词： twist angle harmonic

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Inhibitory Mechanisms of Water Extract of Oplopanax elatus on Lipopolysaccharide-lnduced Inflammatory Responses in RAW 264.7 Murine Macrophage Cells

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Chinese Journal of Integrative Medicine 2020年第9期26卷 670-676页

作者： Ki Sun Kwon Hyun Lim Yong Soo Kwon Myong Jo Kim ji Hye Yoo nam Ho Yoo Hyun Pyo Kim College of Pharmacy Kangwon National UniversityChuncheon(24341)Republic of Korea Department of Bio-Resource Sciences Kangwon National UniversityChuncheon(24341)Republic of Korea Bioherb Research Institute Kangwon National UniversityChuncheon(24341)Republic of Korea

Objective:To study the anti-inflammatory action and cellular mechanism of Oplopanax ***:A hot water extract of OE(WOE)was prepared and a major constituent,syringin,was successfully *** content in WOE was found to be 214.0 p.g/g dried plant(w/w).Their anti-inflammatory activities were examined using RAW 264.7 macrophages and a mouse model of croton oil-induced ear ***:In lipopolysaccharide(LPS)-treated RAW 264.7 cells,a mouse macrophage cell line,WOE was found to significantly and strongly inhibit cyclooxygenase-2(COX-2)-induced prostaglandin E2(PGE2)production[half maximal inhibitory concentration(IC50)=135.2μg/mL]and inducible nitric oxide synthase(iNOS)-induced NO production(IC50=242.9μg/mL).In the same condition,WOE was revealed to inhibit NO production by downregulating iNOS expression,mainly by interrupting mitogen activated protein kinases(MAPKs)/activator protein-1(AP-1)*** activation of all three major MAPKs,p38 MAPK,extracellular signal-regulated kinase(ERK),and c-Jun N-terminal kinase,was inhibited by WOE(50-300μg/mL).On the other hand,WOE reduced PGE2 production by inhibiting COX-2 enzyme activity,but did not affect COX-2 expression *** addition,WOE inhibited the production of proinflammatory cytokines such as interleukin-6 and tumor necrosis factor-α.In croton oil-induced ear edema in mice,oral administration of WOE(50-300 mg/kg)dose-dependently inhibited edematic ***:Water extract of OE exhibited multiple anti-inflammatory action mechanisms and may have potential for treating inflammatory disorders.

关键词： Oplopanax elatus Chinese medicine stem syringin anti-inflammation RAW 264.7

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Efficacy and safety of limited endoscopic sphincterotomy before self-expandable metal stent insertion for malignant biliary obstruction

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World Journal of Gastroenterology 2017年第9期23卷 1627-1636页

作者： Hyeong Seok nam Dae Hwan Kang hyung Wook Kim Cheol Woong Choi Su Bum Park Su jin Kim Dae Gon Ryu Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalYangsan-siGyeongsangnam-do 50612South Korea

To evaluate the safety and efficacy of limited endoscopic sphincterotomy (ES) before placement of self-expandable metal stent (SEMS).METHODSThis was a retrospective analysis of 244 consecutive patients with unresectable malignant biliary obstruction, who underwent placement of SEMSs following limited ES from December 2008 to February 2015. The diagnosis of malignant biliary obstruction and assessment of patient eligibility for the study was established by a combination of clinical findings, laboratory investigations, imaging and pathological results. All patients were monitored in the hospital for at least 24 h following endoscopic retrograde cholangio pancreatography (ERCP). The incidence of immediate or early post-ERCP complications such as post-ERCP pancreatitis (PEP) and bleeding related to limited ES were considered as primary outcomes. Also, characteristics and complications according to the cancer type were *** the 244 patients included, the underlying diagnosis was cholangiocarcinoma in 118 patients, pancreatic cancer in 79, and non-pancreatic or non-biliary malignancies in the remaining 47 patients. Early post-ERCP complications occurred in 9 patients (3.7%), with PEP in 7 patients (2.9%; mild, 6; moderate, 1) and mild bleeding in 2 patients (0.8%). There was no significant association between the incidence of post-ERCP complications and the type of malignancy (cholangiocarcinoma vs pancreatic cancer vs others, P = 0.696) or the type of SEMS used (uncovered vs covered, P = 1.000). Patients who had more than one SEMS placed at the first instance were at a significantly higher risk of post-ERCP complications (one SEMS vs two SEMS, P = 0.031). No other factors were predictive of post-ERCP *** ES is feasible and safe, and effectively facilitates the placement of SEMS, without any significant risk of PEP or severe bleeding.

关键词： Endoscopic sphincterotomy Endoscopic retrograde cholangio pancreatography Complications Pancreatitis Bleeding Cholestasis Self-expandable metal stent

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Parameterization of below-cloud scavenging for polydisperse fine mode aerosols as a function of rain intensity

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Journal of Environmental Sciences 2023年第10期132卷 43-55页

作者： Chang Hoon Jung hyung-Min Lee Dasom Park Young Jun Yoon Yongjoo Choi Junshik Um Seoung Soo Lee ji Yi Lee Yong Pyo Kim Department of Health Management Kyungin Women’s UniversityIncheon 21041Korea Department of Environmental Science and Engineering Ewha Woman’s UniversitySeoulKorea Department of Environmental Engineering Konkuk UniversitySeoulKorea Korea Polar Research Institute IncheonKorea Department of Environment Hankuk University of Foreign StudiesYonginKorea Department of Atmospheric Sciences Pusan National UniversityBusanKorea Earth System Science Interdisciplinary Center University of MarylandCollege ParkMDUSA Research Center for Climate Sciences Pusan National UniversityBusanKorea Department of Chemical Engineering and Materials Science Ewha Womans UniversitySeoulKorea

The below-cloud aerosol scavenging process by precipitation is one of the most important mechanisms to remove aerosols from the *** to its complexity and dependence on both aerosol and raindrop sizes,wet scavenging process has been poorly treated,especially during the removal of fine *** makes the numerical simulation of below-cloud scavenging in large-scale aerosolmodels *** consider the slip effects of submicron particles,a simplified expression for the diffusion scavenging was developed by approximating the Cunningham slip correction *** derived analytic solution was parameterized as a simple power function of rain intensity under the assumption of the lognormal size distribution of *** resultant approximated expression was compared to the observed data and the results of previous studies including a 3D atmospheric chemical transport model *** with the default GEOS-Chem coefficient of 0.00106R0.61 and the observation-based coefficient of 0.0144R0.9268,the coefficient of a and b in∧m=aRb spread in the range of 0.0002-0.1959 for a and 0.3261-0.525 for b over a size distribution of GSD of 1.3–2.5 and a geometric mean diameter of 0.01-2.5μ***,this study showed that the scavenging coefficient varies widely by orders of magnitude according to the size distribution of particles and rain *** study also demonstrated that the obtained simplified expression could consider the theoretical approach of aerosol *** proposed analytic approach showed that results can be effectively applied for reduced computational burden in atmospheric modeling.

关键词： Below-cloud scavenging Polydisperse aerosol Parameterization Cunningham correction factor Scavenging coefficient

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Rupture of carotid artery pseudoaneurysm in the modern era of definitive chemoradiation for head and neck cancer:Two case reports

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World Journal of Clinical Cases 2020年第20期8卷 4858-4865页

作者： Myungsoo Kim ji hyung Hong Sang Kyu Park Sook Jung Kim Jung Hwi Lee JH Byun Yoon Ho Ko Department of Radiation Oncology Incheon St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaIncheon 403720South Korea Department of Internal Medicine Incheon St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaIncheon 21431South Korea Department of Neurosurgery Gangnam Severance HospitalYonsei University College of MedicineSeoul 06273South Korea Department of Internal Medicine Incheon St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 03312South Korea Department of Radiology Incheon St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 03312South Korea Department of Internal Medicine Eun-pyeoung St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 03312South Korea

BACKGROUND Carotid blowout syndrome(CBS)is a rupture of the carotid artery and is mainly caused by radiation and resection of head and neck cancers or direct tumor invasion of the carotid artery *** is a life-threatening clinical *** is no established and effective mode of management of ***,there is no established preceding sign or symptom;therefore,preventive efforts are not clinically *** SUMMARY We described two cases of CBS that occurred in patients with head and neck cancer after definitive chemoradiotherapy(CRT)using three-dimensional conformal intensity-modulated radiation *** men aged 61 and 56 years with locally advanced head and neck cancer were treated with definitive *** completing CRT,both of them achieved complete ***,they had persistent severe pain in the oropharyngeal mucosal region and the irradiated neck despite the use of opioid analgesics and rehabilitation for relief of contracted ***,continuous follow-up imaging studies showed no evidence of cancer *** to twelve months after completing CRT,the patients visited the emergency room complaining about massive oronasal *** showed rupture of carotid artery pseudoaneurysms on the irradiated *** attempting to secure hemostasis with carotid arterial stent insertion and coil embolization,both patients died because of repeated bleeding from the *** In patients with persistent pain in irradiated sites,clinicians should be suspicious of progressing or impending CBS,even in the three-dimensional conformal intensity-modulated radiation therapy era.

关键词： Carotid blow-out syndrome Carotid pseudoaneurysm Head and neck neoplasms Radiation injuries Severe pain Case report

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Fragmentation stability and retention time-shift obtained by LC-MS/MS to distinguish sialylated N-glycan linkage isomers in therapeutic glycoproteins

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Journal of Pharmaceutical Analysis 2023年第3期13卷 305-314页

作者： Chi Soo Park Minju Kang Ahyeon Kim Chulmin Moon Mirae Kim jieun Kim Subin Yang Leeseul Jang ji Yeon Jang Ha hyung Kim Department of Global Innovative Drugs Graduate School of Chung-Ang UniversitySeoul06974Republic of Korea

Sialylated N-glycan isomers withα2-3 orα2-6 linkage(s)have distinctive roles in glycoproteins,but are difficult to ***-type(WT)and glycoengineered(mutant)therapeutic glycoproteins,cytotoxic T lymphocyte-associated antigen-4-immunoglobulin(CTLA4-Ig),were produced in Chinese hamster ovary cell lines;however,their linkage isomers have not been *** this study,N-glycans of CTLA4-Igs were released,labeled with procainamide,and analyzed by liquid chromatography-tandem mass spectrometry(MS/MS)to identify and quantify sialylated N-glycan linkage *** linkage isomers were distinguished by comparison of 1)intensity of the N-acetylglucosamine ion to the sialic acid ion(Ln/Nn)using different fragmentation stability in MS/MS spectra and 2)retention time-shift for a selective m/z value in the extracted ion *** isomer was distinctively identified,and each quantity(>0.1%)was obtained relative to the total N-glycans(100%)for all observed ionization *** sialylated N-glycan isomers with onlyα2-3 linkage(s)in WT were identified,and each isomer's sum of quantities was 50.4%.Furthermore,39 sialylated N-glycan isomers(58.8%)in mono-(3 N-glycans;0.9%),bi-(18;48.3%),tri-(14;8.9%),and tetra-(4;0.7%)antennary structures of mutant were obtained,which comprised mono-(15 N-glycans;25.4%),di-(15;28.4%),tri-(8;4.8%),and tetra-(1;0.2%)sialylation,respectively,with onlyα2-3(10 N-glycans;4.8%),bothα2-3 andα2-6(14;18.4%),and onlyα2-6(15;35.6%)linkage(s).These results are consistent with those forα2-3 neuraminidase-treated *** study generated a novel plot of Ln/Nn versus retention time to distinguish sialylated N-glycan linkage isomers in glycoprotein.

关键词： Therapeutic glycoprotein Sialylation Linkage isomer LC-MS/MS

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Role of ascites adenosine deaminase in differentiating between tuberculous peritonitis and peritoneal carcinomatosis

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World Journal of Gastroenterology 2012年第22期18卷 2837-2843页

作者： Seung Joo Kang ji Won Kim Jee Hyun Baek Se hyung Kim Byeong Gwan Kim Kook Lae Lee ji Bong Jeong Yong jin Jung Joo Sung Kim Hyun Chae Jung In Sung Song Department of Internal Medicine and Liver Research Institute Seoul National University College of Medicine Department of Internal Medicine Seoul National University Boramae Hospital Department of Radiology Seoul National University College of Medicine

AIM： To investigate the usefulness of tumor markers and adenosine deaminase in differentiating between tuberculous peritonitis （TBP） and peritoneal carcinoma- tosis （PC）. METHODS： A retrospective analysis of data was per- formed on consecutive patients who underwent perito- neoscopic and abdominal computed tomography （CT） evaluations. Among 75 patients at the Seoul National University Hospital from January 2000 to June 2010 who underwent both tests, 27 patients （36.0%） and 25 patients （33.3%） were diagnosed with TBP and PC, re- spectively. Diagnosis was confirmed by peritoneoscopic biopsy. RESULTS： Serum c-reactive protein （7.88：1：6.62 mg/ dL vs 3.12 ＋ 2.69 mg/dL, P = 0.01）, ascites adenos- ine deaminase （66.76：1：32.09 IU/L vs 13.89 ：l： 8.95 IU/L, P 〈 0.01）, ascites lymphocyte proportion （67.77 ：1： 23.41% vs 48.36 ＋ 18.78%, P 〈 0.01）, and serum- ascites albumin gradient （0.72 ＋ 0.49 g/dL vs 1.05 ＋ 0.50 g/dL, P = 0.03） were significantly different be- tween the two groups. Among tumor markers, serum and ascites carcinoembryonic antigen, serum carbohy- drate antigen 19-9 showed significant difference be- tween two groups. Abdominal CT examinations showed that smooth involvement of the parietal peritoneum was more common in the TBP group （77.8% vs 40.7%） whereas nodular involvement was more common in the PC group （14.8% vs 40.7%, P = 0.04）. From receiver operating characteristic （ROC） curves ascites adeno- sines deaminase （ADA） showed better discriminative capability than tumor markers. An ADA cut-off level of 21 IU/L was found to yield the best results of differ- ential diagnosis; sensitivity, specificity, positive predic- tive value, and negative predictive value were 92.0%, 85.0%, 88.5% and 89.5%, respectively. CONCLUSION： Besides clinical and radiologic findings, ascitic fluid ADA measurement is helpful in the differen- tial diagnosis of TBP and PC.

关键词： Tuberculous peritonitis Peritoneal carcino-matosis, Adenosine deaminase, Peritoneoscopy

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Generation of tumor spheroids using a droplet-based microfluidic device for photothermal therapy

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Microsystems & Nanoengineering 2020年第1期6卷 796-805页

作者： Jong Min Lee ji Wook Choi Christian D.Ahrberg hyung Woo Choi Jang Ho Ha Seok Gyu Mun Sung Joon Mo Bong Geun Chung Department of Mechanical Engineering Sogang UniversitySeoulKorea Division of Chemical Industry Yeungnam University CollegeDaeguRepublic of Korea Research Center Sogang UniversitySeoulKorea Department of Biomedical Engineering Sogang UniversitySeoulKorea

Despite their simplicity,monolayer cell cultures are not able to accurately predict drug behavior in vivo due to their inability to accurately mimic cell-cell and cell-matrix *** contrast,cell spheroids are able to reproduce these interactions and thus would be a viable tool for testing drug ***,the generation of homogenous and reproducible cell spheroids on a large scale is a labor intensive and slow process compared to monolayer cell ***,we present a droplet-based microfluidic device for the automated,large-scale generation of homogenous cell spheroids in a uniform *** the microfluidic system,the size of the spheroids can be tuned to between 100 and 130μm with generation frequencies of 70 *** demonstrated the photothermal therapy(PTT)application of brain tumor spheroids generated by the microfluidic device using a reduced graphene oxide-branched polyethyleneimine-polyethylene glycol(rGO-BPEI-PEG)nanocomposite as the PTT ***,we generated uniformly sized neural stem cell(NSC)-derived neurospheres in the droplet-based microfluidic *** also confirmed that the neurites were regulated by ***,this droplet-based microfluidic device could be a powerful tool for photothermal therapy and drug screening applications.

关键词： fluid viable simplicity

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