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Color-selective holographic retroreflector array for sensing applications

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Light(Science & Applications) 2016年第1期5卷 241-249页

作者： Rajib Ahmed Ali K Yetisen seok hyun yun Haider Butt Microengineering and Nanotechnology Laboratory School of EngineeringUniversity of BirminghamBirmingham B152TTUK Harvard Medical School and Wellman Center for Photomedicine Massachusetts General HospitalCambridgeMA 02139USA Harvard-MIT Division of Health Sciences and Technology Massachusetts Institute of TechnologyCambridgeMA 02139USA

Corner cube retroreflectors(CCRs)have applications in sensors,image processing,free space communication and wireless *** ability to construct low-loss wavelength filters embedded in CCRs can enable the development of wavelength multiplexing,tunable lasers and photonic integrated *** we created an~10-μm-thick holographic corner cube retroreflector(HCCR)array that acted as a color-selective wavelength filter and diffracted light at broad ***-resolved spectral measurements showed that the Bragg peak of the diffracted light from the HCCR array could be tuned from 460 to 545 nm by varying the incident *** HCCR array also exhibited a wavelength-selective tuning capability based on the rotation angle in the visible *** projected holographic images with the rotational property in the far *** utility of the HCCR was demonstrated as optical temperature and relative humidity sensors that produced a visible colorimetric response for rapid diagnostics.

关键词： Bragg gratings corner cube retroreflectors diffraction optics holography sensors

Multiplexed laser particles for spatially resolved single-cell analysis

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Light(Science & Applications) 2019年第1期8卷 526-530页

作者： Sheldon J.J.Kwok Nicola Martino Paul H.Dannenberg seok-hyun yun Harvard Medical School and Wellman Center for Photomedicine Massachusetts General Hospital50 Blossom StreetBostonMA 02114USA Harvard-MIT Health Sciences and Technology Massachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA 02139USA LASE Innovation Inc. 650 E.Kendall Street2nd FLCambridgeMA 02142USA

Biomolecular analysis at the single-cell level is increasingly important in the study of cellular heterogeneity and its consequences,particularly in organismic development and complex diseases such as ***-cell molecular analyses have led to the identification of new cell types1 and the discovery of novel targets for diagnosis and *** these analyses are performed predominantly on dissociated single cells,emerging techniques seek understanding of cellular state,cellular function and cell–cell interactions within the native tissue environment by combining optical microscopy and single-cell molecular *** techniques include in situ multiplexed imaging of fluorescently labeled proteins and nucleotides,as well as low-throughput ex vivo methods in which specific cells are isolated for downstream molecular ***,these methods are limited in either the number and type of molecular species they can identify or the number of cells that can be ***-throughput methods are needed for comprehensive profiling of many cells(>1000)to detect rare cell types,discriminate relevant biomarkers from intrinsic population noise,and reduce the time and cost of *** established,highthroughput single-cell analyses are not directly applicable because they require tissue dissociation,leading to a loss of spatial *** current methods exist that can seamlessly connect spatial mapping to single-cell *** this Perspective,we review current methods for spatially resolved single-cell analysis and discuss the prospect of novel multiplexed imaging probes,called laser particles,which allow individual cells to be tagged in tissue and analyzed subsequently using high-throughput,comprehensive single-cell techniques.

关键词： diagnosis spatially resolved

Laser particles with omnidirectional emission for cell tracking

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Light(Science & Applications) 2021年第2期10卷 197-207页

作者： Shui-Jing Tang Paul H.Dannenberg Andreas C.Liapis Nicola Martino Yue Zhuo yun-Feng Xiao seok-hyun yun Harvard Medical School and Wellman Center for Photomedicine Massachusetts General HospitalBostonMAUSA State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking University100871 BeijingChina Harvard-MIT Health Sciences and Technology Massachusetts Institute of TechnologyCambridgeMAUSA

The ability to track individual cells in space over time is crucial to analyzing heterogeneous cell ***,microlaser particles have emerged as unique optical probes for massively multiplexed single-cell ***,the microlaser far-field emission is inherently direction-dependent,which causes strong intensity fluctuations when the orientation of the particle varies randomly inside ***,we demonstrate a general solution based on the incorporation of nanoscale light scatterers into *** schemes are developed by introducing either boundary defects or a scattering layer into microdisk *** resulting laser output is omnidirectional,with the minimum-to-maximum ratio of the angle-dependent intensity improving from 0.007(-24 dB)to>0.23(-6dB).After transfer into live cells in vitro,the omnidirectional laser particles within moving cells could be tracked continuously with high signal-to-noise ratios for 2 h,while conventional microlasers exhibited frequent signal loss causing tracking failure.

关键词： scattering directional intensity

Precise photoelectrochemical tuning of semiconductor microdisk lasers

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Advanced Photonics 2023年第5期5卷 68-76页

作者： Debarghya Sarkar Paul HDannenberg Nicola Martino Kwon-Hyeon Kim Yue Wu seok-hyun yun Harvard Medical School BostonMassachusettsUnited States Massachusetts General Hospital Wellman Center for PhotomedicineBostonMassachusettsUnited States Massachusetts Institute of Technology Harvard-MIT Health Sciences and TechnologyCambridgeMassachusettsUnited States

Micro-and nanodisk lasers have emerged as promising optical sources and probes for on-chip and free-space ***,the randomness in disk diameter introduced by standard nanofabrication makes it challenging to obtain deterministic *** address this,we developed a photoelectrochemical(PEC)etching-based technique that enables us to precisely tune the lasing wavelength with subnanometer *** examined the PEC mechanism and compound semiconductor etching rate in diluted sulfuric acid *** this technique,we produced microlasers on a chip and isolated particles with distinct lasing *** precisely tuned disk lasers were then used to tag cells in *** results demonstrate that this scalable technique can be used to produce groups of lasers with precise emission wavelengths for various nanophotonic and biomedical applications.

关键词： microdisk lasers semiconductor precision lasing photoelectrochemical etching laser particle nanophotonics

Inhibitory effects of rapamycin on the different stages of hepatic fibrosis

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World Journal of Gastroenterology 2014年第23期20卷 7452-7460页

作者： yun Jeung Kim Eaum seok Lee seok hyun Kim Heon Young Lee Seung Moo Noh Dae Young Kang Byung seok Lee Department of Internal Medicine Chungnam National University School of MedicineDaejeon 301-721South Korea Department of Surgery Chungnam National University School of MedicineDaejeon 301-721South Korea Department of Pathology Chungnam National University School of MedicineDaejeon 301-721South Korea

AIM: To investigate and compare the inhibitory effects of rapamycin in the different stages of liver fibrosis.

关键词： Liver cirrhosis Sirolimus Transforming growth factor beta Platelet-derived growth factor Ribosomal protein S6 kinases

Yolk-shell-structured （***.s）9S8 solid-solution powders：Synthesis and application as anode materials for Na-ionbatteries

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Nano Research 2017年第9期10卷 3178-3188页

作者： Jung hyun Kim yun Chan Kang Department of Materials Science and Engineering Korea University Anam-Dong Seongbuk-Gu Seou1136-713 Republic of Korea

Multicomponent metal sulfide materials with a yolk–shell structure and a single phase were studied for the first time as anode materials for sodium-ion batteries. Yolk–shell-structured Fe–Ni–O powders with a molar ratio of iron and nickel components of 1/1 were prepared via one-pot spray pyrolysis. The prepared Fe–Ni–O powders were transformed into yolk–shell-structured (Fe0.5Ni0.5)9S8 solid-solution powders via a sulfidation process. The initial discharge and charge capacities of the (Fe0.5Ni0.5)9S8 powders at a current density of 1 A·g−1 were 601 and 504 mA·h·g−1, respectively. The discharge capacities of the (Fe0.5Ni0.5)9S8 powders for the 2nd and 100th cycle were 530 and 527 mA·h·g−1, respectively, and their corresponding capacity retention measured from the 2nd cycle was 99%. The (Fe0.5Ni0.5)9S8 powders had high initial discharge and charge capacities at a low current density of 0.1 A·g−1, and the reversible discharge capacity decreased slightly from 568 to 465 mA·h·g−1 as the current density increased from 0.1 to 5.0 A·g−1. The synergetic effect of the novel yolk–shell structure and the multicomponent sulfide composition of the (Fe0.5Ni0.5)9S8 powders resulted in excellent sodium-ion storage performance.

关键词： metal sulfide multicomponent sulfide yolk–shell sodium-ion batteries spray pyrolysis

Stevens-Johnson syndrome and concurrent hand foot syndrome during treatment with capecitabine:A case report

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World Journal of Clinical Cases 2021年第17期9卷 4279-4284页

作者： Ha Rim Ahn Sang-Kyung Lee hyun Jo Youn seok-Kweon yun Il-Jae Lee Division of Breast and Thyroid Surgery Department of SurgeryJeonbuk National UniversityJeonju 54907South Korea Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital Jeonju 54907South Korea Department of Dermatology Jeonbuk National University Medical SchoolJeonju 54907South Korea

BACKGROUND Capecitabine is used in combination with lapatinib as palliative treatment for human epidermal growth factor receptor 2-positive metastatic breast *** most frequently reported adverse events attributed to capecitabine include diarrhea,hyperbilirubinemia,and hand-foot syndrome(HFS).A number of cutaneous adverse events have been attributed to capecitabine,including Stevens-Johnson syndrome(SJS)as a rare and potentially life-threatening mucocutaneous *** report the first case involving concurrent SJS and HFS after capecitabine and lapatinib *** SUMMARY A 70-year-old woman with a history of breast cancer treatment visited our hospital for evaluation of painful skin *** weeks earlier,she had been prescribed capecitabine plus lapatinib as treatment for metastatic breast *** subsequently developed worsening erythema and bullae on her palms and soles,as well as reddish macules on her back and chest *** evaluation of the chest wall lesions revealed extensive eosinophilic epidermal necrosis and separation of the epidermis from the *** capecitabine plus lapatinib treatment was discontinued immediately and treatment was started using systemic *** treatment resolved most lesions,although the lesions on her palms and soles required Vaseline gauze dressings,which resulted in ***,we determined that the patient had concurrent SJS and *** the dermatological problems resolved,the patient ultimately died because of multiple organ *** Oral capecitabine treatment carries a risk of both HFS and also life-threatening adverse cutaneous drug reactions,such as SJS.

关键词： Stevens-Johnson syndrome Hand-Foot syndrome Palliative treatment Capecitabine Breast neoplasms Case report

Electrochemical partial reduction of Ni(OH)_(2) to Ni(OH)_(2)/Ni via coupled oxidation of an interfacing NiAl intermetallic compound for robust hydrogen evolution

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Journal of Energy Chemistry 2023年第7期82卷 560-571,I0012页

作者： Young Hwa yun Kwangsoo Kim Changsoo Lee Byeong-Seon An Ji Hee Kwon Sechan Lee MinJoong Kim Jongsu Seo Jong Hyeok Park Byung-hyun Kim hyun-seok Cho Hydrogen Research Department Korea Institute of Energy Research152 Gajeong-roYuseong-guDaejeon 34129Republic of Korea Computational Science&Engineering Laboratory Korea Institute of Energy Research152 Gajeong-roYuseong-guDaejeon 34129Republic of Korea Analysis Center for Energy Research Korea Institute of Energy Research152 Gajeong-roYuseong-guDaejeon 34129Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea

Ni-based porous electrocatalysts have been widely used in the hydrogen evolution reaction(HER)in alkaline water electrolysis,and the catalysts are produced by selective leaching of Al from Ni-Al *** is well known that chemical leaching of Ni-Al intermetallic compound(IMC)generates a high surface area in Ni(OH)_(2).However,the Ni(OH)_(2) produced by leaching the Ni-Al intermetallic compound retards the hydrogen evolution reaction,which is attributed to its weak hydrogen adsorption *** this study,we controlled the chemical state of Ni using plasma vapor deposition(PVD)followed by heat treatment,selective Al leaching,and electrochemical reduction.X-ray diffraction(XRD),scanning microscopy(SEM),transmission electron microscopy(TEM),and energy-dispersive X-ray spectroscopy(EDS)were used to confirm the phase evolution of the electrocatalysts during *** reveal that the heat-treated Ni-Al alloy with a thick Ni2Al3surface layer underwent selective Al leaching and produced biphasic interfaces comprising Ni(OH)_(2) and NiAl IMCs at the edges of the grains in the outermost surface *** oxidation of the interfacing NiAl IMCs facilitated the partial reduction of Ni(OH)_(2) to Ni(OH)_(2)/Ni in the grains during electrochemical reduction,as confirmed by X-ray photoelectron spectroscopy(XPS).An electrocatalyst containing partially reduced Ni(OH)_(2)/Ni exhibited an overpotential of 54 mV at 10 mA/cm^(2) in a half-cell measurement,and a cell voltage of 1.675 V at 0.4 A/cm2for single-cell operation.A combined experimental and theoretical study(density functional theory calculations)revealed that the superior HER activity was attributed to the presence of partially reduced metallic Ni with various defects and residual Al,which facilitated water adsorption,dissociation,and finally hydrogen evolution.

关键词： Raney nickel HERChemical leaching Intrinsic activity Partial reduction

Usefulness of colonic tattooing using indocyanine green in patients with colorectal tumors

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World Journal of Clinical Cases 2018年第13期6卷 632-640页

作者： Jae Ho Park Hee seok Moon In Sun Kwon Gee Young yun Seo Hee Lee Dae Hwa Park Ju seok Kim Sun hyung Kang Eaum seok Lee seok hyun Kim Jae Kyu Sung Byung seok Lee hyun Yong Jeong Division of Gastroenterology Department of Internal Medicine Chungnam National University Hospital Chungnam National University college of Medicine Clinical Trials Center Chungnam National University Hospital

AIM To prove that tattooing using indocyanine green(ICG) is feasible in laparoscopic surgery for a colon *** From January 2012 to December 2016, all patients who underwent laparoscopic colonic surgery were retrospectively screened, and 1010 patients with colorectal neoplasms were included. Their lesions were tattooed with ICG the day before the operation. The tattooed group(TG) included 114 patients, and the non-tattooed group(NTG) was selected by propensity score matching of subjects based on age, sex, tumor staging, and operation method(n = 228). In total, 342 patients were enrolled. Between the groups, the changes in [Delta(Δ), preoperative-postoperative] the hemoglobin and albumin levels, operation time, hospital stay, oral ingestion period, transfusion, and perioperative complications were compared. RESULTS Preoperative TG had a shorter operation time(174.76 ± 51.6 min vs 192.63 ± 59.9 min, P < 0.01), hospital stay(9.55 ± 3.36 d vs 11.42 ± 8.23 d, P < 0.01), and postoperative oral ingestion period(1.58 ± 0.96 d vs 2.81 ± 1.90 d, P < 0.01). The Δ hemoglobin(0.78 ± 0.76 g/dL vs 2.2 ± 1.18 g/dL, P < 0.01) and Δ albumin(0.41 ± 0.44 g/dL vs 1.08 ± 0.39 g/dL, P < 0.01) levels were lower in the TG. On comparison of patients in the "N0" and "N1 or N2" groups, the N0 colon cancer group had a better operation time, length of hospital stay, oral ingestion period, Δ hemoglobin, and Δ albumin results than those of the N1 or N2 group. The operation methods affected the results, and laparoscopic anterior resection(LAR) showed similar results. However, for left and right hemicolectomy, both groups showed no difference in operation time or hospital *** Preoperative tattooing with ICG is useful for laparoscopic colectomy, especially in the N0 colon cancer group and LAR.

关键词： Colorectal neoplasm Laparoscopic surgery Endoscopic tattoo Indocyanine green Perioperative