1
|
Kim BS, Won S, Seo J, Jeong SK, Kim C, Kim KS, Kim SH, Cho SM, Kim JH. Embedded Reverse-Offset Printing of Silver Nanowires and Its Application to Double-Stacked Transparent Electrodes with Microscale Patterns. ACS Appl Mater Interfaces 2021; 13:26601-26609. [PMID: 34033467 DOI: 10.1021/acsami.1c04858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We propose an embedded reverse-offset printing (EROP) method, which generates silver nanowire (AgNW) transparent electrodes for display applications. The proposed EROP method can solve the two critical issues of microscale pattern formation and surface planarization. The AgNW electrode had a transmittance of 82% at 550 nm, a sheet resistance of 12.2 Ω/sq, and a 3.27 nm smooth surface. We realized the roll-based pattern formation of AgNW on a plastic substrate as small as 10 μm with negligible step differences to facilitate the proposed method. The proposed EROP method also produced a double-stacked AgNW electrode, enabling the simultaneous operation of separately micropatterned devices. To verify the usefulness of EROP, we fabricated an organic light-emitting diode (OLED) device to demonstrate leakage current reduction and efficiency improvement compared with a conventional indium tin oxide (ITO)-based OLED device. The EROP-based OLED showed 38 and 25% higher current efficiencies than an insulator-patterned AgNW OLED and a conventional ITO-based OLED, respectively.
Collapse
Affiliation(s)
- Bong Sung Kim
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials, Daejeon 34103, Republic of Korea
| | - Sejeong Won
- Center for Advanced Meta-Materials (CAMM), Daejeon 34103, Republic of Korea
| | - Jungkook Seo
- Novel Material Research Laboratory, School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Sang Kyu Jeong
- Novel Material Research Laboratory, School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Chan Kim
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials, Daejeon 34103, Republic of Korea
- Nanomechatronics, University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Kwang-Seop Kim
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials, Daejeon 34103, Republic of Korea
- Nanomechatronics, University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Sun Ho Kim
- Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Sung Min Cho
- Novel Material Research Laboratory, School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Jae-Hyun Kim
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials, Daejeon 34103, Republic of Korea
- Nanomechatronics, University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
| |
Collapse
|
2
|
Di Pardo A, Pepe G, Capocci L, Marracino F, Amico E, Del Vecchio L, Giova S, Jeong SK, Park BM, Park BD, Maglione V. Treatment with K6PC-5, a selective stimulator of SPHK1, ameliorates intestinal homeostasis in an animal model of Huntington's disease. Neurobiol Dis 2020; 143:105009. [PMID: 32634578 DOI: 10.1016/j.nbd.2020.105009] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 06/10/2020] [Accepted: 06/29/2020] [Indexed: 02/08/2023] Open
Abstract
Emerging evidence indicates that Huntington's disease (HD) may be described as multi-organ pathology. In this context, we and others have contributed to demonstrate that the disease is characterized by an impairment of the homeostasis of gastro-intestinal (GI) tract. Sphingolipids represent a class of molecules involved in the regulation and maintenance of different tissues and organs including GI system. In this study, we investigated whether the alteration of Sphingosine-1-phosphate (S1P) metabolism, previously described in human HD brains and animal models, is also detectable peripherally in R6/2 HD mice. Our findings indicate, for the first time, that sphingolipid metabolism is perturbed early in the disease in the intestinal tract of HD mice and, its modulation by K6PC-5, a selective activator of S1P synthesis, preserved intestinal integrity and homeostasis. These results further support the evidence that modulation of sphingolipid pathways may represent a potential therapeutic option in HD and suggest that it has also the potential to counteract the peripheral disturbances which may usually complicate the management of the disease and affect patient's quality of life.
Collapse
Affiliation(s)
| | - G Pepe
- IRCCS Neuromed, Pozzilli, Italy
| | | | | | - E Amico
- IRCCS Neuromed, Pozzilli, Italy
| | - L Del Vecchio
- IRCCS Neuromed, Pozzilli, Italy; Unità complessa di radiodiagnostica (U.O.C.) POS, University of Foggia, Foggia, Italy
| | - S Giova
- IRCCS Neuromed, Pozzilli, Italy
| | - S K Jeong
- Department of Cosmetic Science, Seowon University, Cheongju, Republic of Korea
| | - B M Park
- NeoPharm USA Inc., Engelwood Cliffs, NJ, USA
| | - B D Park
- Dr. Raymond Laboratories, Inc, Englewood cliffs, NJ, USA
| | | |
Collapse
|
3
|
Kastner S, Chen Q, Jeong SK, Mruczek REB. A brief comparative review of primate posterior parietal cortex: A novel hypothesis on the human toolmaker. Neuropsychologia 2017; 105:123-134. [PMID: 28159617 DOI: 10.1016/j.neuropsychologia.2017.01.034] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 01/26/2017] [Accepted: 01/30/2017] [Indexed: 10/20/2022]
Abstract
The primate visual system contains two major cortical pathways: a ventral-temporal pathway that has been associated with object processing and recognition, and a dorsal-parietal pathway that has been associated with spatial processing and action guidance. Our understanding of the role of the dorsal pathway, in particular, has greatly evolved within the framework of the two-pathway hypothesis since its original conception. Here, we present a comparative review of the primate dorsal pathway in humans and monkeys based on electrophysiological, neuroimaging, neuropsychological, and neuroanatomical studies. We consider similarities and differences across species in terms of the topographic representation of visual space; specificity for eye, reaching, or grasping movements; multi-modal response properties; and the representation of objects and tools. We also review the relative anatomical location of functionally- and topographically-defined regions of the posterior parietal cortex. An emerging theme from this comparative analysis is that non-spatial information is represented to a greater degree, and with increased complexity, in the human dorsal visual system. We propose that non-spatial information in the primate parietal cortex contributes to the perception-to-action system aimed at manipulating objects in peripersonal space. In humans, this network has expanded in multiple ways, including the development of a dorsal object vision system mirroring the complexity of the ventral stream, the integration of object information with parietal working memory systems, and the emergence of tool-specific object representations in the anterior intraparietal sulcus and regions of the inferior parietal lobe. We propose that these evolutionary changes have enabled the emergence of human-specific behaviors, such as the sophisticated use of tools.
Collapse
Affiliation(s)
- S Kastner
- Department of Psychology, USA; Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544, USA.
| | - Q Chen
- Department of Psychology, USA; School of Psychology, South China Normal University, Guangzhou 510631, China
| | - S K Jeong
- Department of Psychology, USA; Korea Brain Research Institute, Daegu, South Korea
| | - R E B Mruczek
- Department of Psychology, Worcester State University, Worcester, MA 01520, USA
| |
Collapse
|
4
|
Bernacchioni C, Cencetti F, Kwon MJ, Gwak HS, Jeong SK, Bruni P, Donati C. The sphingosine kinase activator K6PC-5 stimulates C2C12 myoblast differentiation. Int J Immunopathol Pharmacol 2011; 24:55-62. [PMID: 21496387 DOI: 10.1177/039463201102400107] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Previously, K6PC-5, a synthetic derivative of ceramide, was demonstrated to activate sphingosine kinase (SK)-1 in keratinocytes. In this study its potential biological effect in mouse myoblasts was examined. The obtained results show that K6PC-5 promotes myogenic differentiation by enhancing myogenic marker expression, differentiation index and fusion index. Interestingly, its biological action was prevented by pharmacological inhibition of SK or S1P2 receptor, in full agreement with their recognized role in myoblast differentiation. This is the first evidence that pharmacological activation of SK accelerates myogenesis and suggests that this new therapeutic strategy could be possibly employed in skeletal muscle disorders where muscle regeneration is deficient.
Collapse
Affiliation(s)
- C Bernacchioni
- Dipartimento di Scienze Biochimiche, Università di Firenze; Istituto Interuniversitario di Miologia, Firenze, Italy
| | | | | | | | | | | | | |
Collapse
|
5
|
Yoon H, Moon OK, More SJ, Park CK, Park JY, Lee YJ, Lee SD, Ha JK, Jeong SK, Jeong JW, Lee SJ. An outbreak of highly pathogenic avian influenza at a public animal exhibit in seoul, Korea, during 2008. Zoonoses Public Health 2009; 57:142-5. [PMID: 19638167 DOI: 10.1111/j.1863-2378.2009.01235.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study describes the first recorded outbreak of HPAI in the city of Seoul, in captive birds held in an exhibition for public viewing at a local district office. The index cases were two pheasants, which had been introduced into the exhibit on 24 April, 4 days prior to death, from a store in a local market in Gyeonggi-do. Ducks and chickens from an HPAI outbreak farm, subsequently confirmed on 4 May, had also been held in this store. This outbreak highlights the potential role of local markets in AIV transmission. This outbreak led to considerable public health concern in Korea, however, no human cases were reported. The non-commercial poultry sector needs to be considered in national plans for preparedness and response.
Collapse
Affiliation(s)
- H Yoon
- Veterinary Epidemiology Division, National Veterinary Research and Quarantine Service, Anyang, Gyeonggi-do, Republic of Korea.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Choi SP, Park HK, Park KN, Kim YM, Ahn KJ, Choi KH, Lee WJ, Jeong SK. The density ratio of grey to white matter on computed tomography as an early predictor of vegetative state or death after cardiac arrest. Emerg Med J 2008; 25:666-9. [DOI: 10.1136/emj.2007.053306] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
7
|
Park BD, Youm JK, Jeong SK, Choi EH, Ahn SK, Lee SH. The characterization of molecular organization of multilamellar emulsions containing pseudoceramide and type III synthetic ceramide. J Invest Dermatol 2003; 121:794-801. [PMID: 14632198 DOI: 10.1046/j.1523-1747.2003.12470.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
To investigate the molecular organization and phase behavior of physiologic lipid mixtures that contain either newly synthesized pseudoceramide or type III synthetic ceramide, various analytical techniques were used. The phase transition temperatures detected in differential scanning calorimetry analysis were 51.19 and 50.52 for the pseudoceramide-containing physiologic lipid mixture and synthetic type III ceramide-containing lipid mixture, respectively. From the small angle XRD patterns, the multilamellar emulsion-pseudoceramide showed 11.5 nm and 7.61 nm lamellar phases, while the multilamellar emulsion-synthetic ceramide showed only a 7.61 nm lamellar phase. The nonceramide containing lipid mixture did not show any distinct repeat pattern. Lateral packing distances of multilamellar emulsion-pseudoceramide and multilamellar emulsion-synthetic ceramide were measured as 0.4119 and 0.4110 nm at 30, respectively, which indicated the presence of hexagonal lattice. On the contrary, non-multilamellar emulsion did not show any definite repeat pattern. Transmission electron microscopy observation showed nearly comparable lamellar structures in all of the tested emulsions compared to the structure of human stratum corneum intercellular lipid. Decrease of water contents resulted in phase transition into liquid phase for all the tested emulsions, whereas phase transition into orthorhombic phase was observed only in multilamellar emulsion-pseudoceramide. From these results, we concluded that the molecular organization of multilamellar emulsion-pseudoceramide was characterized as the lateral hexagonal phase and both the long and short periodicity lamellar phases, which showed structural similarity with the native human stratum corneum intercellular lipid.
Collapse
Affiliation(s)
- B D Park
- NeoPharm Co., Ltd, Taejeon, Korea
| | | | | | | | | | | |
Collapse
|
8
|
Jung S, Kang SS, Kim TS, Kim HJ, Jeong SK, Kim SC, Lee JK, Kim JH, Kim SH, Lee JH. Current surgical results of retrosigmoid approach in extralarge vestibular schwannomas. Surg Neurol 2000; 53:370-7; discussion 377-8. [PMID: 10825523 DOI: 10.1016/s0090-3019(00)00196-8] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Vestibular schwannomas (VS) are common tumors that can be cured; they are reported to comprise 6 approximately 8% of all intracranial tumors. The primary objective in the surgery of extralarge VS is total removal of the tumor mass while preserving the facial nerve. In extralarge tumors, complete excision of the tumor carries a significant risk of injuring the facial nerve and adjacent vital brain structures. The authors are reporting the techniques and results of operation on extralarge VS. METHODS The material consisted of 30 patients during the last 6 years with surgically treated VS that had a maximal extrameatal diameter exceeding 4 cm. Suboccipital craniotomy and tumor removal was performed with patients in the lateral position. Results and complications of the surgical technique will be reviewed. RESULTS Average age of patients was 45.2 years; there was a slight female predominance (1.5:1). Size of the mass ranged from 41 to 70 mm; all were removed by the retrosigmoid transmeatal approach. Peritumoral edema on MRI was seen in 50% (15/30). Total removal was achieved in 73.3% (22/30) with no significant relationship to peritumoral edema. In the cases of total removal, the facial nerve preservation rate was 86.4% (19/22). There was no mortality. Surgical complications were hemorrhage and CSF leakage in 1 case (3%) and 8 cases (26.7%), respectively, but in most of these cases, conservative treatment was adequate. In patients in whom anatomic preservation of the facial nerve was achieved, facial nerve function improved progressively within a year. In all cases except for one with gait disturbance, a good outcome was achieved. CONCLUSIONS Our surgical techniques, including the prediction of facial nerve displacement, not using retractors, and replacement of bone, contributed to good surgical results in a series of extralarge VS.
Collapse
Affiliation(s)
- S Jung
- Department of Neurosurgery, Chonnam National University Research Institute of Medical Sciences, Chonnam University Hospital & Medical School, Kwangju, Republic of Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Abstract
In the left eye of a 27-year-old man we found perivascular creamy sheathing of retinal veins with retinal hemorrhages and, on fluorescein angiography, delayed filling of veins with late leakage. Dramatic recovery of visual acuity and healing of retinal lesions followed intravenous corticosteroid therapy. However, the condition recurred several times within a few months. Fluorescein angiography showed delayed filling of arteries and veins and arteriovenous anastomoses with a widespread capillary nonperfusion area. Eventually, neovascular glaucoma resulted. It is suggested that frosted branch angiitis is related to vascular occlusion. Systemic corticosteroid therapy seems to affect the course of this disease.
Collapse
Affiliation(s)
- M S Seo
- Department of Ophthalmology, Chonnam National University Medical School and Hospital, Chonnam University Research Institute of Medical Science, Kwangju, Korea
| | | | | | | |
Collapse
|