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Luo X, Chen C, He Z, Wang M, Pan K, Dong X, Li Z, Liu B, Zhang Z, Wu Y, Ban C, Chen R, Zhang D, Wang K, Wang Q, Li J, Lu G, Liu J, Liu Z, Huang W. A bionic self-driven retinomorphic eye with ionogel photosynaptic retina. Nat Commun 2024; 15:3086. [PMID: 38600063 PMCID: PMC11006927 DOI: 10.1038/s41467-024-47374-6] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 03/27/2024] [Indexed: 04/12/2024] Open
Abstract
Bioinspired bionic eyes should be self-driving, repairable and conformal to arbitrary geometries. Such eye would enable wide-field detection and efficient visual signal processing without requiring external energy, along with retinal transplantation by replacing dysfunctional photoreceptors with healthy ones for vision restoration. A variety of artificial eyes have been constructed with hemispherical silicon, perovskite and heterostructure photoreceptors, but creating zero-powered retinomorphic system with transplantable conformal features remains elusive. By combining neuromorphic principle with retinal and ionoelastomer engineering, we demonstrate a self-driven hemispherical retinomorphic eye with elastomeric retina made of ionogel heterojunction as photoreceptors. The receptor driven by photothermoelectric effect shows photoperception with broadband light detection (365 to 970 nm), wide field-of-view (180°) and photosynaptic (paired-pulse facilitation index, 153%) behaviors for biosimilar visual learning. The retinal photoreceptors are transplantable and conformal to any complex surface, enabling visual restoration for dynamic optical imaging and motion tracking.
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Affiliation(s)
- Xu Luo
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Chen Chen
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Zixi He
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Min Wang
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Keyuan Pan
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Xuemei Dong
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Zifan Li
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Bin Liu
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Zicheng Zhang
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Yueyue Wu
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Rong Chen
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Dengfeng Zhang
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Kaili Wang
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Qiye Wang
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Junyue Li
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Gang Lu
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China.
| | - Zhengdong Liu
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China.
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, China.
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an, China.
- State Key Laboratory of Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications, Nanjing, China.
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Xu J, Ban C, Xiu F, Tian Z, Jiang W, Zhang M, Zhang H, Zhou Z, Liu J, Huang W. Multimode Visualization of Electronic Skin from Bioinspired Colorimetric Sensor. ACS Appl Mater Interfaces 2021; 13:30205-30212. [PMID: 34137259 DOI: 10.1021/acsami.1c07360] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Bioskins possess a great ability to detect and deliver external mechanical or temperature stimuli into identifiable signals such as color changes. However, the integration of visualization with simultaneous detection of multiple complex external stimuli in a single biosensor device remains a challenge. Here we propose an all-solution-processed bioinspired stretchable electronic skin with interactive color changes and four-mode sensing properties. The fabricated biosensor demonstrates sensitive responses to various stimuli including pressure, strain, voltage, and temperature. Sensing visualization is realized by color changes of the e-skin from brown to green and finally bright yellow as a response to intensified external stimuli, suggesting great application potential in military defense, healthcare monitoring, and smart bionic skin.
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Affiliation(s)
- Jingxuan Xu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Fei Xiu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Zhihui Tian
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Wenjie Jiang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Minjie Zhang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Heshan Zhang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Zhe Zhou
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
- Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an 710072, China
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications (NUPT), 9 Wenyuan Road, Nanjing 210023, China
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Tian Z, Zhang H, Xiu F, Zhang M, Zou J, Ban C, Nie Y, Jiang W, Hu B, Liu J. Wearable and washable light/thermal emitting textiles. Nanoscale Adv 2021; 3:2475-2480. [PMID: 36134169 PMCID: PMC9417798 DOI: 10.1039/d1na00063b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 03/19/2021] [Indexed: 05/08/2023]
Abstract
Electronic textiles (e-textiles) typically comprise fabric substrates with electronic components capable of heating, sensing, lighting and data storage. In this work, we rationally designed and fabricated anisotropic light/thermal emitting e-textiles with great mechanical stability based on a sandwich-structured tri-electrode device. By coating silver nanowire network/thermal insulation bilayer on fabrics, an anisotropic thermal emitter can be realized for smart heat management. By further covering the emissive film and the top electrode on the bilayer, light emitters with desirable patterns and colors are extracted from the top surface via an alternative current derived electroluminescence. Both the light and thermal emitting functions can be operated simultaneously or separately. Particularly, our textiles exhibit reliable heating and lighting performance in water, revealing excellent waterproof feature and washing stability.
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Affiliation(s)
- Zhihui Tian
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
| | - Heshan Zhang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
| | - Fei Xiu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
| | - Minjie Zhang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
| | - Jiahao Zou
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
| | - Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
| | - Yijie Nie
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
| | - Wenjie Jiang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
| | - Bin Hu
- School of Optics and Photonics, Beijing Institute of Technology Beijing 100081 China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China
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4
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Ye T, Xiu F, Cheng S, Ban C, Tian Z, Chen Y, Ding Y, Zhen Z, Liu J, Huang W. Recyclable and Flexible Dual-Mode Electronics with Light and Heat Management. ACS Nano 2020; 14:6707-6714. [PMID: 32437131 DOI: 10.1021/acsnano.9b09932] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Realizing multiple functions and sustainable manufacturing within the same electronic device would be highly attractive from a design and fabrication perspective. Here we demonstrate a recyclable dual-mode thin-film device that can perform both light emission and heat management simultaneously. The device is composed of a dissolvable emitting layer sandwiched between two undissolvable conducting films. The vertical multilayered device enables a highly flexible and foldable multicolor electroluminescent emission ranging from yellow or blue to white, and the coplanar monolayered conductor achieves tunable Joule heat temperature setting. By utilizing selective dissolution and artificial reconstruction of each layered component, the parent device shows full recyclability and reconstructability without severe performance degradation after several recycles. The proof-of concept device provides an ideal strategy to construct a multifunctional film system with recyclability and makes a significant contribution to scientific and technological advancement in low-cost sustainable electronics and optoelectronics.
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Affiliation(s)
- Tengyang Ye
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Fei Xiu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Shuai Cheng
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Zhihui Tian
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Yingying Chen
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Yamei Ding
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Ziwei Zhen
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
- Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an 710072, China
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5
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Huang J, Ban C, Liu L, Ye Y. Dynamics and risk indicators of intrasinus elevation height following transalveolar sinus floor elevation with immediate implant placement: a longitudinal cohort study. Int J Oral Maxillofac Surg 2020; 50:109-115. [PMID: 32507405 DOI: 10.1016/j.ijom.2020.04.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 08/28/2019] [Revised: 02/19/2020] [Accepted: 04/30/2020] [Indexed: 12/11/2022]
Abstract
Successful intrasinus graft consolidation is essential for the treatment outcome of transalveolar sinus floor elevation (SFE). This study was performed to examine the dynamics and risk indicators related to the elevation height after transalveolar SFE with grafting material and simultaneous implant placement. Fifty-two patients with 55 sites undergoing transalveolar SFE with immediate implant placement were enrolled retrospectively. Cone beam computed tomography (CBCT) images were collected and saved in DICOM format, at the following time-points: pre-surgery (T0), immediately post-surgery (T1), and 6 months post-surgery (T2). Voxel-based CBCT superimposition was performed to measure the sinus width, residual alveolar height, implant protrusion length, total elevation height, and apical graft height. The change in total elevation height from T1 to T2 was defined as the study outcome. Clinical and linear variables were analysed using linear regression. From T1 to T2, the total elevation height showed an average reduction of 1.0±1.1mm, while 10.9% sites showed an increased elevation height. Univariate regression analysis showed no significant correlation between tested clinical or linear variables and the study outcome. The results suggest that the change in elevation height was not influenced by the alveolar or sinus dimensions, graft materials, implant diameter, implant protrusion length, or the total elevation height at T1.
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Affiliation(s)
- J Huang
- Department of Oral Implantology, School and Hospital of Stomatology, Tongji University; Shanghai Engineering Research Centre of Tooth Restoration and Regeneration, Shanghai, China
| | - C Ban
- Department of Oral Implantology, School and Hospital of Stomatology, Tongji University; Shanghai Engineering Research Centre of Tooth Restoration and Regeneration, Shanghai, China
| | - L Liu
- Department of Oral Implantology, School and Hospital of Stomatology, Tongji University; Shanghai Engineering Research Centre of Tooth Restoration and Regeneration, Shanghai, China
| | - Y Ye
- Department of Oral Implantology, School and Hospital of Stomatology, Tongji University; Shanghai Engineering Research Centre of Tooth Restoration and Regeneration, Shanghai, China.
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Wang X, Zhou Z, Ban C, Zhang Z, Ju S, Huang X, Mao H, Chang Q, Yin Y, Song M, Cheng S, Ding Y, Liu Z, Ju R, Xie L, Miao F, Liu J, Huang W. Multifunctional Polymer Memory via Bi-Interfacial Topography for Pressure Perception Recognition. Adv Sci (Weinh) 2020; 7:1902864. [PMID: 32328417 PMCID: PMC7175288 DOI: 10.1002/advs.201902864] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 12/20/2019] [Indexed: 05/19/2023]
Abstract
Emerging memory devices, that can provide programmable information recording with tunable resistive switching under external stimuli, hold great potential for applications in data storage, logic circuits, and artificial synapses. Realization of multifunctional manipulation within individual memory devices is particularly important in the More-than-Moore era, yet remains a challenge. Here, both rewritable and nonerasable memory are demonstrated in a single stimuli-responsive polymer diode, based on a nanohole-nanowrinkle bi-interfacial structure. Such synergic nanostructure is constructed from interfacing a nanowrinkled bottom graphene electrode and top polymer matrix with nanoholes; and it can be easily prepared by spin coating, which is a low-cost and high-yield production method. Furthermore, the resulting device, with ternary and low-power operation under varied external stimuli, can enable both reversible and irreversible biomimetic pressure recognition memories using a device-to-system framework. This work offers both a general guideline to fabricate multifunctional memory devices via interfacial nanostructure engineering and a smart information storage basis for future artificial intelligence.
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Affiliation(s)
- Xiangjing Wang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Zhe Zhou
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Zepu Zhang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Shang Ju
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Xiao Huang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Huiwu Mao
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Qing Chang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Yuhang Yin
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Mengya Song
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Shuai Cheng
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Yamei Ding
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Zhengdong Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Ruolin Ju
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM)Nanjing University of Posts & Telecommunications (NUPT)9 Wenyuan RoadNanjing210023China
| | - Linghai Xie
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM)Nanjing University of Posts & Telecommunications (NUPT)9 Wenyuan RoadNanjing210023China
| | - Feng Miao
- National Laboratory of Solid State MicrostructuresSchool of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM)Nanjing University of Posts & Telecommunications (NUPT)9 Wenyuan RoadNanjing210023China
- Shaanxi Institute of Flexible Electronics (SIFE)Northwestern Polytechnical University (NPU)127 West Youyi RoadXi'an710072China
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Yin Y, Zhou Z, Wang X, Mao H, Ban C, Chen Y, Liu J, Liu Z, Huang W. Hierarchical Hollow-Pore Nanostructure Bilayer Heterojunction Comprising Conjugated Polymers for High-Performance Flash Memory. ACS Appl Mater Interfaces 2020; 12:1103-1109. [PMID: 31808338 DOI: 10.1021/acsami.9b16778] [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] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report the design and preparation of hierarchical hollow-pore nanostructure bilayer conjugated polymer films for high-performance resistive memory devices. By taking the merits of chemical and structural stabilities of a two-dimensional conjugated microporous polymer (2D CMP), a poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) film with a hollow surface was spin-coated onto 2D CMP nanofilm directly, constructing a bilayer heterojunction. A two-terminal diode with a configuration of indium tin oxide/2D CMP/hollow MEH-PPV/Al was fabricated by employing the prepared bilayer heterojunction. The device poses flash feature with a high on/off ratio (>105) and a long retention time (>3.0 × 104 s), which is higher than that of most of the reported conjugated polymers memories. Our work offers a general guideline to construct high on/off ratio polymer memories via hierarchical nanostructure engineering in memristive layer.
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Affiliation(s)
- Yuhang Yin
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Zhe Zhou
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Xiaojing Wang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Huiwu Mao
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Yuanbo Chen
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Zhengdong Liu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
- Shaanxi Institute of Flexible Electronics (SIFE) , Northwestern Polytechnical University (NPU) , 127 West Youyi Road , Xi'an 710072 , China
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Cheng S, Ye T, Mao H, Wu Y, Jiang W, Ban C, Yin Y, Liu J, Xiu F, Huang W. Electrostatically assembled carbon dots/boron nitride nanosheet hybrid nanostructures for thermal quenching-resistant white phosphors. Nanoscale 2020; 12:524-529. [PMID: 31845941 DOI: 10.1039/c9nr07785e] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Carbon dots (C-dots) are promising and widely applied carbon fluorescent materials for next-generation white light-emitting diodes (WLEDs). However, nonnegligible thermal quenching issues induced by high working temperature of high-power WLEDs severely limit the further development of C-dot phosphors. In this paper, we report an efficient strategy to improve thermal dissipation within C-dot phosphors to solve the thermal quenching problem. C-dots/hexagonal boron nitride nanosheet (BNNS) hybrid nanostructures have been firstly prepared through an electrostatic assembly method. Owing to the effective heat transfer channels established by C-dots/BNNS in a polymer matrix, heat could be dissipated efficiently and the working temperature of WLEDs is reduced by 29 °C, suggesting excellent thermal quenching-resistance properties. Particularly, the hybrids show thermally stable emission without obvious emission loss up to 100 °C. Moreover, the C-dots/BNNS-WLEDs still maintain a high color rendering index of Ra > 89, revealing that the present strategy could promote the exploration of carbon phosphors with thermal quenching resistance for high-quality LED applications.
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Affiliation(s)
- Shuai Cheng
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China.
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9
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Zhang Z, Nie Y, Hua W, Xu J, Ban C, Xiu F, Liu J. Interfacial synthesis of a large-area coordination polymer membrane for rewritable nonvolatile memory devices. RSC Adv 2020; 10:20900-20904. [PMID: 35517775 PMCID: PMC9054294 DOI: 10.1039/d0ra02933e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 05/08/2020] [Indexed: 11/21/2022] Open
Abstract
The facile synthesis of large-area coordination polymer membranes with controlled nanoscale thicknesses is critical towards their applications in information storage electronics. Here, we have reported a facile and substrate-independent interfacial synthesis method for preparing a large-area two-dimensional (2D) coordination polymer membrane at the air–liquid interface. The prepared high-quality 2D membrane could be transferred onto an indium tin oxide (ITO) substrate to construct a nonvolatile memory device, which showed reversible switching with a high ON/OFF current ratio of 103, good stability and a long retention time. Our discovery of resistive switching with nonvolatile bistability based on the substrate-independent growth of the 2D coordination polymer membrane holds significant promise for the development of solution-processable nonvolatile memory devices with a miniaturized device size. Stable nonvolatile memory devices with a high ON/OFF current ratio have been realized based on a large-area two-dimensional coordination polymer membrane.![]()
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Affiliation(s)
- Zepu Zhang
- Key Laboratory of Flexible Electronics (KLOFE)
- Institute of Advanced Materials (IAM)
- Nanjing Tech University (NanjingTech)
- Nanjing 211816
- China
| | - Yijie Nie
- Key Laboratory of Flexible Electronics (KLOFE)
- Institute of Advanced Materials (IAM)
- Nanjing Tech University (NanjingTech)
- Nanjing 211816
- China
| | - Weiwei Hua
- Key Laboratory of Flexible Electronics (KLOFE)
- Institute of Advanced Materials (IAM)
- Nanjing Tech University (NanjingTech)
- Nanjing 211816
- China
| | - Jingxuan Xu
- Key Laboratory of Flexible Electronics (KLOFE)
- Institute of Advanced Materials (IAM)
- Nanjing Tech University (NanjingTech)
- Nanjing 211816
- China
| | - Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLOFE)
- Institute of Advanced Materials (IAM)
- Nanjing Tech University (NanjingTech)
- Nanjing 211816
- China
| | - Fei Xiu
- Key Laboratory of Flexible Electronics (KLOFE)
- Institute of Advanced Materials (IAM)
- Nanjing Tech University (NanjingTech)
- Nanjing 211816
- China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE)
- Institute of Advanced Materials (IAM)
- Nanjing Tech University (NanjingTech)
- Nanjing 211816
- China
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10
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Ban C, Wang X, Zhou Z, Mao H, Cheng S, Zhang Z, Liu Z, Li H, Liu J, Huang W. A Universal Strategy for Stretchable Polymer Nonvolatile Memory via Tailoring Nanostructured Surfaces. Sci Rep 2019; 9:10337. [PMID: 31316141 PMCID: PMC6637107 DOI: 10.1038/s41598-019-46884-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 06/24/2019] [Indexed: 11/17/2022] Open
Abstract
Building stretchable memory is an effective strategy for developing next-generation memory technologies toward stretchable and wearable electronics. Here we demonstrate a universal strategy for the fabrication of high performance stretchable polymer memory via tailoring surface morphology, in which common conjugated polymers and sharp reduced graphene oxide (r-rGO) films are used as active memristive layers and conductive electrodes, respectively. The fabricated devices feature write-once-read-many-times (WORM) memory, with a low switching voltage of 1.1 V, high ON/OFF current ratio of 104, and an ideal long retention time over 12000 s. Sharp surface-induced resistive switching behavior has been proposed to explore the electrical transition. Moreover, the polymer memory show reliable electrical bistable properties with a stretchability up to 30%, demonstrating their great potential candidates as high performance stretchable memory in soft electronics.
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Affiliation(s)
- Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Xiangjing Wang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Zhe Zhou
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Huiwu Mao
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Shuai Cheng
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Zepu Zhang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Zhengdong Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Hai Li
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China.
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China. .,Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an, 710072, China. .,Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), SICAM, Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing, 210023, China.
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11
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Chang Q, Ding Y, Cheng S, Shen W, Zhou Z, Yin Y, Sun T, Ban C, Deng Z, Liu J, Xiu F, Huang W. Quench-resistant and stable nanocarbon dot/sheet emitters with tunable solid-state fluorescence via aggregation-induced color switching. Nanoscale 2019; 11:2131-2137. [PMID: 30657518 DOI: 10.1039/c8nr08429g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Nanocarbon fluorescence materials are promising color converters for multicolor emission via phosphor-coated light emitting devices (LEDs). Herein, a facile time-controlled solvothermal route was developed to prepare solid-state multicolor nanocarbon emitters comprising dot/sheet nanohybrids. The nanocarbons demonstrate an aggregation-induced color switching behavior, leading to tunable light emission from blue to yellow by modulating the solvothermal reaction time. Particularly, these emitters show outstanding film-forming ability directly and a high production yield (∼40%). Moreover, the nanocarbon-coated ultraviolet LEDs exhibit high quality multicolor light emission and excellent color stability at high voltages, impelling the development of emerging carbon phosphors in fundamental research studies and practical applications.
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Affiliation(s)
- Qing Chang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China.
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12
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Ju S, Ding Y, Yin Y, Cheng S, Wang X, Mao H, Zhou Z, Song M, Chang Q, Ban C, Liu Z, Liu J. Preparation of large-area ultrathin carbon semiconductors converted from conjugated microporous polymer films. RSC Adv 2019; 9:17399-17404. [PMID: 35519850 PMCID: PMC9064592 DOI: 10.1039/c9ra03052b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 05/29/2019] [Indexed: 11/23/2022] Open
Abstract
Two-dimensional carbon semiconductors have aroused great attention due to their unique structures and novel properties, showing potential applications in emerging electronic and optoelectronic devices. In this work, we reported an effective strategy to controllable prepare ultrathin carbon nanofilms (CNFs) by combining in situ-growth and stepwise thermal annealing, with the features of large-area, tunable properties and nanoscale thickness. The structures, morphologies and electrical properties of these as-prepared CNFs were characterized systematically. Impressively, tunable electrical properties from low to semi- and high conductivity could be precisely achieved through stepwise annealing of conjugated microporous polymer films. By introducing CNF-750 as the active channel layer, the transistor exhibited a typical p-type semiconductor property. Moreover, by further coupling CNF-750 with carbon dots (CDs) as a photoresponse layer, the as-fabricated all-carbon diode based on CDs/CNF-750 heterostructure film showed high ultraviolet (UV) light response. Large-area carbon semiconductors were prepared by combining the in situ polymerization with thermal annealing process. Moreover, a photodetector based on carbon dots decorated carbon semiconductors was fabricated.![]()
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Tian XZ, Paengkoum P, Paengkoum S, Chumpawadee S, Ban C, Thongpea S. Short communication: Purple corn (Zea mays L.) stover silage with abundant anthocyanins transferring anthocyanin composition to the milk and increasing antioxidant status of lactating dairy goats. J Dairy Sci 2018; 102:413-418. [PMID: 30415857 DOI: 10.3168/jds.2018-15423] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [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: 07/22/2018] [Accepted: 09/22/2018] [Indexed: 12/13/2022]
Abstract
The present study used 16 multiparous lactating Saanen dairy goats (body weight, 41.80 ± 2.92 kg; mean ± standard deviation) with healthy and symmetrical udders. Goats were divided into 2 blocks of 8 goats based on milk yield averaged from 75 d in milk in a randomized completed block design. The 2 study groups were the control (CSSS), in which goats were fed sticky corn stover silage, and the treatment (TPSS), in which goats were fed anthocyanin-rich purple corn (Zea mays L.) stover silage (PSS). The results indicated that the TPSS group led to an elevation in the content of milk lactose relative to the CSSS. The inclusion of anthocyanin-rich PSS had no effect on the level of 5 particular anthocyanins [i.e., cyanidin-3-glucoside, delphinidin, cyanidin, pelargonidin (Pel), as well as total anthocyanins in milk]. The pelargonidin-3-glucoside and malvidin were unable to be detected in both groups. However, the TPSS resulted in higher levels of peonidin (Peo) and malvidin-3-O-glucoside (M3G) compared with the control. Moreover, goats receiving TPSS exhibited a higher level of superoxide dismutase (SOD) in plasma and milk relative to the CSSS. Interestingly, some positive correlations were detected between the certain milk components [i.e., fat and total solids as well as fat and solids-not-fat (SNF); protein and SNF; and total solids and SNF]. In addition, the positive correlations were observed between individual anthocyanins (cyanidin-3-glucoside, delphinidin, Peo, M3G, cyanidin, and Pel) and total anthocyanins. Specifically, stronger positive correlations were noted between several antioxidant enzymes and anthocyanin composition in milk (total antioxidant capacity and Pel; SOD and Peo as well as SOD and M3G). Taken together, PSS with abundant anthocyanins can transfer anthocyanins to the milk and enhance the amount of antioxidants in lactating dairy goats.
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Affiliation(s)
- X Z Tian
- School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand
| | - P Paengkoum
- School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand.
| | - S Paengkoum
- Program in Agriculture, Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University, Muang, Nakhon Ratchasima 30000, Thailand
| | - S Chumpawadee
- Department of Agricultural Technology, Faculty of Technology, Mahasarakham University, Bangkok 44150, Thailand
| | - C Ban
- School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand
| | - S Thongpea
- School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand
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14
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Lu H, Chen Y, Chang Q, Cheng S, Ding Y, Chen J, Xiu F, Wang X, Ban C, Liu Z, Liu J, Huang W. Polymer-carbon dot hybrid structure for a self-rectifying memory device by energy level offset and doping. RSC Adv 2018; 8:13917-13920. [PMID: 35539360 PMCID: PMC9079846 DOI: 10.1039/c8ra01928b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 03/31/2018] [Indexed: 11/21/2022] Open
Abstract
A strategy for self-rectifying memory diodes based on a polymer–carbon dot hybrid structure, with a configuration of rGO/PEDOT : PSS/carbon dots/MEH-PPV/Al, has been proposed. The fabricated device exhibits a rectification of 103 in the rectification model and an ON/OFF current ratio of 121 in the memory model. The rectifying behavior was attributed to an energy level offset between the electrodes and the bilayer polymers and the memory effect was induced by carrier trapping of carbon dots within the polymers. A strategy for self-rectifying memory diodes based on a polymer–carbon dot hybrid structure, with a configuration of rGO/PEDOT : PSS/carbon dots/MEH-PPV/Al, has been proposed.![]()
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Affiliation(s)
- Hang Lu
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Yingying Chen
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Qing Chang
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Shuai Cheng
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Yamei Ding
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Jie Chen
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Fei Xiu
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Xiangjing Wang
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Chaoyi Ban
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Zhengdong Liu
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 P. R. China
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15
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Ding Y, Chang Q, Xiu F, Chen Y, Liu Z, Ban C, Cheng S, Liu J, Huang W. Zero- and two-dimensional hybrid carbon phosphors for high colorimetric purity white light-emission. Nanoscale 2018; 10:4189-4193. [PMID: 29442110 DOI: 10.1039/c7nr09631c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Carbon nanomaterials are promising phosphors for white light emission. A facile single-step synthesis method has been developed to prepare zero- and two-dimensional hybrid carbon phosphors for the first time. Zero-dimensional carbon dots (C-dots) emit bright blue luminescence under 365 nm UV light and two-dimensional nanoplates improve the dispersity and film forming ability of C-dots. As a proof-of-concept application, the as-prepared hybrid carbon phosphors emit bright white luminescence in the solid state, and the phosphor-coated blue LEDs exhibit high colorimetric purity white light-emission with a color coordinate of (0.3308, 0.3312), potentially enabling the successful application of white emitting phosphors in the LED field.
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Affiliation(s)
- Yamei Ding
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.
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16
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Kim T, Ban C. Structural basis on small MutS-related domain of human BCL-3 binding protein. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308088016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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17
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Wahl MC, Ramakrishnan B, Ban C, Chen X, Sundaralingam M. RNA - synthesis, purification and crystallization. Acta Crystallogr D Biol Crystallogr 2005; 52:668-75. [PMID: 15299630 DOI: 10.1107/s0907444996002788] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Protocols for the routine chemical synthesis and purification of milligram quantities of RNA and DNA-RNA chimeras meeting the demands of X-ray crystallography are described. An efficient screening protocol to test the crystallizability of the molecules and the optimization of the crystallization conditions are presented, so as to allow reproduction by others. Essentially the same crystallization conditions as for DNA oligomers can be employed for RNA crystallization. Specific examples involving alternating octamers, G/C-rich decamers, sequences with overhangs, and drug complexes of chimeras are discussed. Success of the methods is attested by the crystals obtained which diffract to high resolution.
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Affiliation(s)
- M C Wahl
- The Ohio State University, Laboratory of Biological Macromolecular Structure, Department of Biochemistry, Columbus 43210-1002, USA
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18
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Affiliation(s)
- W Yang
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland 20892, USA
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19
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Watanabe Y, Mitomo M, Tokuda Y, Yoshida K, Choi S, Hosoki T, Ban C. Eclamptic encephalopathy: MRI, including diffusion-weighted images. Neuroradiology 2002; 44:981-5. [PMID: 12483442 DOI: 10.1007/s00234-002-0867-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2002] [Accepted: 07/22/2002] [Indexed: 11/24/2022]
Abstract
Eclampsia is a rare condition peculiar to pregnant and puerperal women. We analyse imaging features in five patients with eclampsia, and determine whether diffusion-weighted imaging (DWI) could differentiate cytotoxic and vasogenic oedema in four of them. All were imaged within 4 days of the onset of symptoms. We found lesions with a prolonged T2 in the brain of all five patients, in the basal ganglia in four, pons in three and posterior cerebral white matter in two. Isotropic DWI revealed variable intensity in these regions. The ADC was decreased in one, and increased in all the others. The lesion with reduced ADC progressed to infarction.
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Affiliation(s)
- Y Watanabe
- Department of Radiology, Osaka National Hospital, 2-1-14 Hoenzaka Chuo-ku, Osaka 540-0006, Japan.
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20
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Pop I, Ban C, Stepan E, Roiu G. [Incidence of ocular trauma in Clinical Hospital Oradea between 1997-1999]. Oftalmologia 2002; 52:85-9. [PMID: 11771109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The purpose of the study is to analyse the great number of ocular injuries which were diagnosed and treated in the out-patients clinic or in the hospital in 1997-1999. Ocular trauma seems to be related to the working place or the main activities of the patients, such as agriculture or housekeeping. Ocular injuries in children are significant as number and prognosis. Blunt trauma, ocular perforations, ocular foreign bodies and burns were studied separately for children, housekeepers, unemployed, working and retired people. Due to their number and complexity, ocular trauma represent a very important part in the activity of an ophthalmology department. The conclusion of the study is the number of ocular injuries decreased over the years because of the reduced industrial activity in our town. Similar ocular injuries in retired and working people suggest that retired people are still active. The prognosis of ocular trauma is better if the patients come early to be seen by the specialist, if the treatment is adequate and if the department has a proper equipment for advanced surgery techniques.
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21
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Pop I, Ban C, Hanciu D, Petroi C. [A myopia study of glaucoma patients following pilocarpine instillation]. Oftalmologia 2001; 52:44-8. [PMID: 11021139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
AIM Our research studies transitory myopia induced by Pilocarpine treatment in glaucoma patients. MATERIAL AND METHODS 48 patients with open angle glaucoma were selected, visual acuity and refraction were measured before and after the instillation of Pilocarpine 2%, for two hours. Induced myopia was compared for different ages and it was established the influence of Timolol and Acetazolamide administered in the same time. RESULTS Transitory myopia is important in young patients, reduced after 50 years and absent after 70 years. Acetazolamide increases myopia, Timolol has no effect on refraction. CONCLUSIONS The study confirms the unpleasant effect of Pilocarpine and suggests not performing refractometry in the first two hours after the instillation of the drug.
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Affiliation(s)
- I Pop
- Spitalul Clinic de Oftalmologie, Oradea
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22
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Abstract
DNA mismatch repair is critical for increasing replication fidelity in organisms ranging from bacteria to humans. MutS protein, a member of the ABC ATPase superfamily, recognizes mispaired and unpaired bases in duplex DNA and initiates mismatch repair. Mutations in human MutS genes cause a predisposition to hereditary nonpolyposis colorectal cancer as well as sporadic tumours. Here we report the crystal structures of a MutS protein and a complex of MutS with a heteroduplex DNA containing an unpaired base. The structures reveal the general architecture of members of the MutS family, an induced-fit mechanism of recognition between four domains of a MutS dimer and a heteroduplex kinked at the mismatch, a composite ATPase active site composed of residues from both MutS subunits, and a transmitter region connecting the mismatch-binding and ATPase domains. The crystal structures also provide a molecular framework for understanding hereditary nonpolyposis colorectal cancer mutations and for postulating testable roles of MutS.
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Affiliation(s)
- G Obmolova
- Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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23
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Biswas I, Ban C, Fleming KG, Qin J, Lary JW, Yphantis DA, Yang W, Hsieh P. Oligomerization of a MutS mismatch repair protein from Thermus aquaticus. J Biol Chem 1999; 274:23673-8. [PMID: 10438551 DOI: 10.1074/jbc.274.33.23673] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [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: 11/06/2022] Open
Abstract
The MutS DNA mismatch protein recognizes heteroduplex DNAs containing mispaired or unpaired bases. We have examined the oligomerization of a MutS protein from Thermus aquaticus that binds to heteroduplex DNAs at elevated temperatures. Analytical gel filtration, cross-linking of MutS protein with disuccinimidyl suberate, light scattering, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry establish that the Taq protein is largely a dimer in free solution. Analytical equilibrium sedimentation showed that the oligomerization of Taq MutS involves a dimer-tetramer equilibrium in which dimer predominates at concentrations below 10 microM. The DeltaG(0)(2-4) for the dimer to tetramer transition is approximately -6.9 +/- 0.1 kcal/mol of tetramer. Analytical gel filtration of native complexes and gel mobility shift assays of an maltose-binding protein-MutS fusion protein bound to a short, 37-base pair heteroduplex DNA reveal that the protein binds to DNA as a dimer with no change in oligomerization upon DNA binding.
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Affiliation(s)
- I Biswas
- Genetics and Biochemistry Branch, NIDDK, National Institutes of Health, Bethesda, Maryland 20892, USA
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Abstract
The MutL DNA mismatch repair protein has recently been shown to be an ATPase and to belong to an emerging ATPase superfamily that includes DNA topoisomerase II and Hsp90. We report here the crystal structures of a 40 kDa ATPase fragment of E. coli MutL (LN40) complexed with a substrate analog, ADPnP, and with product ADP. More than 60 residues that are disordered in the apoprotein structure become ordered and contribute to both ADPnP binding and dimerization of LN40. Hydrolysis of ATP, signified by subsequent release of the gamma-phosphate, releases two key loops and leads to dissociation of the LN40 dimer. Dimerization of the LN40 region is required for and is the rate-limiting step in ATP hydrolysis by MutL. The ATPase activity of MutL is stimulated by DNA and likely acts as a switch to coordinate DNA mismatch repair.
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Affiliation(s)
- C Ban
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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25
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Abstract
MutL and its homologs are essential for DNA mismatch repair. Mutations in genes encoding human homologs of MutL cause multiorgan cancer susceptibility. We have determined the crystal structure of a 40 kDa N-terminal fragment of E. coli MutL that retains all of the conserved residues in the MutL family. The structure of MutL is homologous to that of an ATPase-containing fragment of DNA gyrase. We have demonstrated that MutL binds and hydrolyzes ATP to ADP and Pi. Mutations in the MutL family that cause deficiencies in DNA mismatch repair and a predisposition to cancer mainly occur in the putative ATP-binding site. We provide evidence that the flexible, yet conserved, loops surrounding this ATP-binding site undergo conformational changes upon ATP hydrolysis thereby modulating interactions between MutL and other components of the repair machinery.
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Affiliation(s)
- C Ban
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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Zolog I, Chercota V, Ban C. [Pseudophacos explant: the causes and the functional results]. Oftalmologia 1998; 42:14-9. [PMID: 9713195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We've studied a number of 20 cases of pseudophakic explantation performed in the Eye Center Timişoara between 1991-1997 from 2605 pseudophakic implantations. The interval between implantation and the moment of explantation was between 4 days and 7 years. The causes which indicated pseudophakic explantation were: pseudophakic bullous keratopathy, IOL decentration and dislocation, uveitis, persistent secondary glaucoma. The study refers to the established treatment for avoiding the explantation and also to the functional results obtained after pseudophakic explantation. Most of the explanted artificial lens cases were anterior chamber lens--13, all of them ALCON type, also we've explanted 4 pupillary implants Fedorov type. The visual acuities obtained after explantation were between hand movement perception and 10/10. Before surgery, visual acuity was between light perception and 10/10. The best functional results were obtained in pseudophakic decentration and dislocation cases and the worst in pseudophakic bullous keratopathy, uveitis and secondary glaucoma cases.
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Affiliation(s)
- I Zolog
- Clinica de Oftalmologie, Timişoara
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Abstract
MutS, MutL and MutH are the three essential proteins for initiation of methyl-directed DNA mismatch repair to correct mistakes made during DNA replication in Escherichia coli. MutH cleaves a newly synthesized and unmethylated daughter strand 5' to the sequence d(GATC) in a hemi-methylated duplex. Activation of MutH requires the recognition of a DNA mismatch by MutS and MutL. We have crystallized MutH in two space groups and solved the structures at 1.7 and 2.3 A resolution, respectively. The active site of MutH is located at an interface between two subdomains that pivot relative to one another, as revealed by comparison of the crystal structures, and this presumably regulates the nuclease activity. The relative motion of the two subdomains in MutH correlates with the position of a protruding C-terminal helix. This helix appears to act as a molecular lever through which MutS and MutL may communicate the detection of a DNA mismatch and activate MutH. With sequence homology to Sau3AI and structural similarity to PvuII endonuclease, MutH is clearly related to these enzymes by divergent evolution, and this suggests that type II restriction endonucleases evolved from a common ancestor.
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Affiliation(s)
- C Ban
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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28
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Abstract
The crystal structure of the DNA heptamer d(GCGCGCG) has been solved at 1.65 A resolution by the molecular replacement method and refined to an R-value of 0.184 for 3598 reflections. The heptamer forms a Z-DNA d(CGCGCG)2 with 5'-overhang G residues instead of an A-DNA d(GCGCGC)2 with 3'-overhang G residues. The overhang G residues from parallel strands of two adjacent duplexes form a trans reverse Hoogsteen G x G basepair that stacks on the six Z-DNA basepairs to produce a pseudocontinuous helix. The reverse Hoogsteen G x G basepair is unusual in that the displacement of one G base relative to the other allows them to participate in a bifurcated (G1)N2 . . . N7(G8) and an enhanced (G8)C8-H . . . O6(G1) hydrogen bond, in addition to the two usual hydrogen bonds. The 5'-overhang G residues are anti and C2'-endo while the 3'-terminal G residues are syn and C2'-endo. The conformations of both G residues are different from the syn/C3'-endo for the guanosine in a standard Z-DNA. The two cobalt hexammine ions bind to the phosphate groups in both GpC and CpG steps in Z(I) and Z(II) conformations. The water structure motif is similar to the other Z-DNA structures.
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Affiliation(s)
- B Pan
- Biological Macromolecular Structure Center, Department of Chemistry, The Ohio State University, Columbus 43210-1002, USA
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29
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Abstract
The crystal structure of the RNA duplex, r(GUAUGUA)dC, with a 3'-terminal deoxy C residue, has been determined at 1.38 A resolution. The r(GUAUGU) hexameric consensus sequence is present at the exon-intron junction in pre-mRNAs of yeast and higher eukaryotic organisms. The crystal belongs to the rhombohedral space group R3. The hexagonal unit cell dimensions are a = b = 39.71 A, c = 68.15 A and gamma = 120 degrees with one duplex in the asymmetric unit. The structure was solved using the molecular replacement method. The final model contains 332 atoms of the duplex and 67 solvent molecules. The R-factor is 17.6% (Rfree of 23.1%) for 4035 reflections with F > or = 1.5sigma(F) in the resolution range 10.0 to 1.38 A. The duplex is of the A-type with a pseudodyad relating the two strands. The RNA helix is slightly distorted, in spite of the presence of two adjacent G x U wobble base-pairs located at the center of the helix. The twist angle between the wobble pairs, 38.1 degrees, is above the average value and those between the wobble base-pairs and the flanking Watson-Crick base-pairs, 26.7 degrees and 26.3 degrees, respectively, are lower than the average values. The twist between the junction base-pairs are about 24 degrees. The G x U wobble pairs are bridged by water molecules and solvated in the grooves. G x U base-pairs are as stable as the Watson-Crick A x U pairs and only slightly less stable than the G x C pairs accounting for their frequent occurrence in RNA.
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Affiliation(s)
- R Biswas
- Department of Chemistry, Biological Macromolecular Structure Center, The Ohio State University, Columbus 43210, USA
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30
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Abstract
Alternating self-complementary oligonucleotides starting with a 5'-pyrimidine usually form left-handed Z-DNA; however, with a 5'-purine start sequence they form the right-handed A-DNA. Here we report the crystal structure of the decamer d(GCGCGCGCGC) with a 5'-purine start in the Z-DNA form. The decamer crystallizes in the hexagonal space group P6(5)22, unit cell dimensions a = b = 18.08 and c = 43.10 A, with one of the following four dinucleotide diphosphates in the asymmetric unit: d(pGpC)/d(GpCp)/d(pCpG)/d(CpGp). The molecular replacement method, starting with d(pGpC) of the isomorphous Z-DNA hexamer d(araC-dG)3 without the 2'-OH group of arabinose, was used in the structure analysis. The method gave the solution only after the sugar-phosphate conformation of the GpC step was manipulated. The refinement converged to a final R value of 18.6% for 340 unique reflections in the resolution range 8.0-1.9 A. A result of the sequence alternation is the alternation in the nucleotide conformation; guanosine is C3'-endo, syn, and cytidine is C2'-endo, anti. The CpG step phosphodiester conformation is the same as ZI or ZII, whereas that of the GpC step phosphodiester is "intermediate" in the sense that zeta (O3'-P bond) is the same as ZII but alpha (P-O5' bond) is the same as ZI. The duplexes generated from the dinucleotide asymmetric unit are stacked one on top of the other in the crystal to form an infinite pseudocontinuous helix. This renders it a quasi-polymerlike structure that has assumed the Z-DNA conformation further strengthened by the long inner Z-forming stretch d(CG)4. An interesting feature of the structure is the presence of water strings in both the major and the minor grooves. In the minor groove the cytosine carbonyl oxygen atoms of the GpC and CpG steps are cross-bridged by water molecules that are not themselves hydrogen bonded but are enclosed by the water rings in the mouth of the minor groove. In the major groove three independent water molecules form a zigzagging continuous water string that runs throughout the duplex.
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Affiliation(s)
- C Ban
- Department of Chemistry, Ohio State University, Columbus 43210, USA
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31
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Abstract
The crystal structure of the alternating 5'-purine start decamer d(GCGCGCGCGC) was found to be in the left-handed Z-DNA conformation. Inasmuch as the A.T base pair is known to resist Z-DNA formation, we substituted A.T base pairs in the dyad-related positions of the decamer duplex. The alternating self-complementary decamer d(GCACGCGTGC) crystallizes in a different hexagonal space group, P6(1)22, with very different unit cell dimensions a = b = 38.97 and c = 77.34 A compared with the all-G.C alternating decamer. The A.T-containing decamer has one strand in the asymmetric unit, and because it is isomorphous to some other A-DNA decamers it was considered also to be right-handed. The structure was refined, starting with the atomic coordinates of the A-DNA decamer d(GCGGGCCCGC), by use of 2491 unique reflections out to 1.9-A resolution. The refinement converged to an R value of 18.6% for a total of 202 nucleotide atoms and 32 water molecules. This research further demonstrates that A.T base pairs not only resist the formation of Z-DNA but can also assist the formation of A-DNA by switching the helix handedness when the oligomer starts with a 5'-purine; also, the length of the inner Z-DNA stretch (d(CG)n) is reduced from an octamer to a tetramer. It may be noted that these oligonucleotide properties are in crystals and not necessarily in solutions.
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Affiliation(s)
- C Ban
- Department of Chemistry, Ohio State University, Columbus 43210, USA
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Wahl MC, Ban C, Sekharudu C, Ramakrishnan B, Sundaralingam M. Structure of the Purine–Pyrimidine Alternating RNA Double Helix, r(GUAUAUA)d(C), with a 3'-Terminal Deoxy Residue. Acta Crystallogr D Biol Crystallogr 1996; 52:655-67. [PMID: 15299629 DOI: 10.1107/s0907444996000248] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The crystal structure of the purine-pyrimidine alternating octameric RNA helix, r(GUAUAUA)d(C), carrying a 3'-terminal deoxycytidine residue, has been determined at 2.2 A resolution. The molecule crystallizes in the rhombohedral space group R3 (hexagonal cell constants: a = b = 43.07,c = 59.36 A;alpha = beta = 90,gamma = 120 degrees )with one duplex in an asymmetric unit. The structure was solved by molecular replacement and refined with 83 and 2/3 solvent molecules and 2/3 sodium ions to a final R factor of 15.6% using 1775 reflections (86%). The duplexes are approximately linear, their global helix axes are inclined by 10 degrees with respect to the 3(2)-screw axes, and they are stacked on top of each other in a head-to-tail fashion. The twist between the junction base pairs of the stacked duplexes is negligible resulting in a discontinuity of the helix backbones and grooves. The sodium ions on the threefold axis play a significant role in the organization of the packing network. The helical parameters, particularly the twist and the roll, of this alternating sequence are in accord with Calladine's rules. Almost all the 2'-hydroxyl groups are involved in specific hydrogen-bonding interactions, either directly to the sugar ring oxygens O4' on the 3' side, or, through water bridges, to the sugars, phosphates, or bases. This hydrogen bonding of the 2'-hydroxyl groups restrains the conformation of the sugar-phosphate backbone and the glycosidic torsion angles of this RNA fragment. The lack of intermolecular packing contacts in the grooves provides a clear picture of the groove solvation.
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Affiliation(s)
- M C Wahl
- The Ohio State University, Laboratory of Biological Macromolecular Structure, Department of Biochemistry, Columbus 43210-1002, USA
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33
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Ban C, Ramakrishnan B, Sundaralingam M. Crystal structure of the highly distorted chimeric decamer r(C)d(CGGCGCCG)r(G).spermine complex--spermine binding to phosphate only and minor groove tertiary base-pairing. Nucleic Acids Res 1994; 22:5466-76. [PMID: 7816639 PMCID: PMC332097 DOI: 10.1093/nar/22.24.5466] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The crystal structure of the self-complementary chimeric decamer duplex r(C)d(CGGCGCCG)r(G), with RNA base pairs at both termini, has been solved at 1.9 A resolution by the molecular replacement method and refined to an R value of 0.145 for 2,314 reflections. The C3'-endo sugar puckers of the terminal riboses apparently drive the entire chimeric duplex into an A-DNA conformation, in contrast to the B-DNA conformation adopted by the all-deoxy decamer of the same sequence. Five symmetry related duplexes encapsulate a spermine molecule which interacts with ten phosphate groups, both directly and through water molecules to form multiple ionic and hydrogen bonding interactions. The spermine interaction severely bends the duplexes by 31 degrees into the major groove at the fourth base pair G(4).C(17), jolts it and slides the 'base plate' into the minor groove. This base pair, together with the adjacent base pair in the top half and the corresponding pseudo two-fold related base pairs in the bottom half, form four minor groove base-paired multiples with the terminal base pairs of two neighboring duplexes.
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Affiliation(s)
- C Ban
- Department of Chemistry, Ohio State University, Columbus 43210
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Okagaki A, Ban C, Suzuki A, Ozawa M, Sagawa N, Mori T. Calculation of pulsatility index of flow volume independent of vessel diameter and flow profile. Placenta 1994. [DOI: 10.1016/0143-4004(94)90146-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Ban C, Ramakrishnan B, Sundaralingam M. A single 2'-hydroxyl group converts B-DNA to A-DNA. Crystal structure of the DNA-RNA chimeric decamer duplex d(CCGGC)r(G)d(CCGG) with a novel intermolecular G-C base-paired quadruplet. J Mol Biol 1994; 236:275-85. [PMID: 7508984 DOI: 10.1006/jmbi.1994.1134] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We have found that the introduction of a single 2'-hydroxyl group on the sugar-phosphate backbone of the B-DNA decamer d(CCGGCGCCGG) transforms it to A-DNA. Thus, for the first time the X-ray structures of the same sequence have been observed in both the A and B-DNA conformations, permitting a comparison. Crystals of the DNA-RNA chimeric decamer d(CCGGC)r(G)d(CCGG) belong to the orthorhombic space group P2(1)2(1)2(1) with unit cell dimensions a = 25.63 A, b = 45.24 A and c = 47.99 A, and one decamer duplex in the asymmetric unit. The structure was solved by a rigid body search using the coordinates of the isomorphous structure d(CCCGGCCGGG) and refined to an R value of 0.136 using 2753 unique reflections at 1.9 A resolution. The final model contains 406 nucleotide atoms and 61 water molecules. The chimeric duplex exhibits typical A-DNA geometry, with all the sugars in the C(3')-endo puckering and the base-pairs inclined and displaced from the helix axis. The 2'-hydroxyl groups on rG6 and rG16 protrude into the minor groove surface and form different types of hydrogen bonds; that on strand 1 forms an intermolecular hydrogen bond with the furanose ring O(4') of a symmetry-related C1 residue, while that on strand 2 is involved in two water bridges. Crystal packing forces the G4-G17 base-pair in the top half of the duplex to slide significantly into the minor groove compared to the corresponding G7-G14 base-pair in the bottom half, resulting in these base-pairs exhibiting different base stacking and intermolecular interactions. The base G4 of the G4-G17 base-pair forms an unorthodox base "triple", G4*(G10-C11), hydrogen-bonding through its minor groove sites N(2) and N(3) to the minor groove atoms N(2) and O(2) of both bases of the G10-C11 base-pair of a symmetry-related molecule. The base G10 of this triple in turn forms a second similar unorthodox base triple, G10*(G3*C18), with the adjacent base-pair G3-C18 of the duplex, thus G10 is involved in a double triple. On the other hand, in the bottom half of the duplex, the C7-G14 base-pair is involved only in a single similar unorthodox base triple with G20, (C7-G14)*G20, while the adjacent base-pair rG6-C15 is involved in a novel quadruple with C1-G20, (rG6-C15) *(C1-G20), where the latter base-pairs are hydrogen-bonded to each other via the minor groove sites G(N(2))...C(O(2)).(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- C Ban
- Department of Chemistry, Ohio State University, Columbus 43210
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Ban C, Ramakrishnan B, Ling KY, Kung C, Sundaralingam M. Structure of the recombinantParamecium tetraureliacalmodulin at 1.68 Å resolution. Acta Crystallogr D Biol Crystallogr 1994; 50:50-63. [PMID: 15299476 DOI: 10.1107/s0907444993007991] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The crystal structure of the recombinant calmodulin from Paramecium tetraurelia (rPCaM, M(r) = 16 700, 148 residues) has been determined at 1.68 A resolution. X-ray intensity data were collected at 263 K using a Siemens-Nicolet area detector and Cu Kalpha radiation from a rotating-anode source. A total of 35 936 observations were processed with XENGEN1.3 and scaled to yield 16 255 unique reflections with R(symm)(I) of 4.1%. The crystals are triclinic, with unit-cell dimensions a = 29.89, b = 53.42, c = 25.35 A, alpha = 93.67, beta = 96.88, gamma = 89.24 degrees, space group P1, with one molecule in the unit cell. The atomic coordinates of the wild-type Paramecium calmodulin (PCaM) studied in our laboratory provided the starting model. Refinement of the structure by X-PLOR and refitting it into omit maps yielded an R value of 0.194 for 15 965 reflections greater than 3sigma(F) in the 6.0-1.68 A resolution range. The final model contained 1165 protein atoms for all of the 148 residues, four Ca(2+) ions, and 172 water molecules. The dumbbell structure has seven alpha-helices including a long 7.8 turn central helix connecting the two terminal domains each containing two EF-hand (helix-loop-helix motif) calcium-binding sites. The loops within each pair of EF-hand motifs in the N- and C-terminal domains are brought into juxtaposition to form a pair of hydrogen-bonded antiparallel beta-sheets which are extended at either ends by water bridges. The four calcium-binding EF-hands are superposable with r.m.s. deviations of 0.31-0.79 A. The best agreement is between site 1 and site 3 and the worst agreement is between site 1 and 4. The largest differences are in the ninth and tenth residues of the calcium-binding loops probably because of their involvement in the mini beta-sheets. The calcium coordination distances vary between 2.04 and 2.69 A, average 2.34 A. The rPCaM and wild-type PCaM have an r.m.s. deviation of 0.36 A for equivalent C(alpha) atoms. The side chains of Lys13 and Lys115 are more extended in rPCaM compared to the wild type where the post-translational modified di- and tri-methylated lysine residues are more folded. The sequence of PCaM differs from those of mammalian (MCaM) and Drosophila calmodulin (DCaM), but the overall structures are very similar, with r.m.s,. deviations of 0.44 and 1.68 A for equivalent C(alpha) atoms, respectively. However, in rPCaM, the first four N-terminal residues stretch out and make intermolecular crystal contacts, in contrast to those in recombinant Drosophila calmodulin (rDCaM), they stretch out in the opposite direction and towards the second calcium-binding site (see note below), while in MCaM and wild-type PCaM, the N-terminal residues are not visible. The central helix in rPCaM has all its backbone hydrogen bonds intact with no unusually long separation between the carbonyl and amide groups as found in MCaM and rDCaM.
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Affiliation(s)
- C Ban
- Laboratory of Biological Macromolecular Structure, Department of Chemistry, Biochemistry and Biotechnology Center, The Ohio State University, Columbus, OH 43210, USA
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Ohara A, Yamada S, Suzuki N, Okagaki A, Shibamoto T, Nagano T, Nakai Y, Ban C, Tamura H, Suzuki A. [A case of hCG-producing cervical carcinoma of uterus]. Nihon Sanka Fujinka Gakkai Zasshi 1993; 45:1333-6. [PMID: 8258734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- A Ohara
- Department of Obstetrics and Gynecology, Osaka National Hospital
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Li XM, Sagawa N, Ihara Y, Okagaki A, Hasegawa M, Inamori K, Itoh H, Mori T, Ban C. The involvement of platelet-activating factor in thrombocytopenia and follicular rupture during gonadotropin-induced superovulation in immature rats. Endocrinology 1991; 129:3132-8. [PMID: 1954894 DOI: 10.1210/endo-129-6-3132] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To investigate whether the platelets in the ovaries are activated by the action of platelet-activating factor (PAF) during gonadotropin-induced ovulation, we examined the changes in the platelet count in immature rats after administration of PMSG followed 48 h later by human CG (hCG). The platelet count in the inferior vena cava was significantly decreased 48 h after PMSG administration and was further decreased after hCG administration. When both ovaries of rats were extirpated, the administration of PMSG and hCG did not decrease the platelet count. Subcutaneous administration of a PAF antagonist, Y24180 (0.5-5 mg/kg.6 h), after PMSG injection decreased the number of ova shed in a dose-dependent manner. The decrease in the platelet count induced by the administration of PMSG and hCG was reversed to the level of the untreated control group by Y24180 (2.5 mg/kg.6 h). This inhibitory activity of Y24180 on ovulation and thrombocytopenia was completely reversed by the ip injection of synthetic PAF. Subcutaneous administration of indomethacin (IDM) also reduced the number of ova shed in a dose-dependent manner. However, thrombocytopenia was not reversed by IDM. Moreover, the inhibition of ovulation by IDM was not reversed by synthetic PAF. The present study suggests that: 1) platelets are activated by PAF during gonadotropin-induced ovulation in immature rats; 2) PAF is also involved in the rupture of follicles; 3) the presence of the ovary is indispensable for the generation of PAF in gonadotropin-stimulated immature rats; and 4) the mechanism of PAF action on ovulation may be different from that of prostaglandins.
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Affiliation(s)
- X M Li
- Department of Gynecology and Obstetrics, Kyoto University Faculty of Medicine, Japan
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39
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Ito K, Yoshida H, Hatoyama H, Matsumoto H, Ban C, Mori T, Sugiyama T, Ishibashi T, Okuma M, Uchino H. Antibody removal therapy used successfully at delivery of a pregnant patient with Glanzmann's thrombasthenia and multiple anti-platelet antibodies. Vox Sang 1991; 61:40-6. [PMID: 1949709 DOI: 10.1111/j.1423-0410.1991.tb00925.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [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: 12/29/2022]
Abstract
A 31-year-old Japanese woman with Glanzmann's thrombasthenia became pregnant voluntarily. She had had transfusions with more than 60 units for severe bleeding. She had multiple antibodies against HLA antigens and platelet glycoprotein IIb/IIIa. No compatible platelets were available. To prevent serious hemorrhage during her delivery, antibody removal therapy was carried out three times. Large molecules including immunoglobulins were removed from more than 3 liters of plasma each time. After the titer of antiplatelet antibodies had decreased in the patient's blood, antihuman globulin-lymphocyte cytotoxicity test compatible platelets were transfused. Her bleeding time improved and delivery was induced successfully despite atonic hemorrhage of about 2,000 g of blood. Her infant had no bleeding problems. This patient is the first with Glanzmann's thrombasthenia to receive antibody removal therapy at delivery.
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Affiliation(s)
- K Ito
- Department of Transfusion Medicine, Kyoto University Hospital, Japan
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40
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Uray Z, Nistor C, Ban C, Maniu M, Imreh P, Nistor V, Laszlo G, Bălan M, Onişer M. Effect of trophopar in the incorporation of radioiron in rats irradiated with sublethal doses. Eur J Pharmacol 1990. [DOI: 10.1016/0014-2999(90)93092-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kobayashi F, Sagawa N, Okagaki A, Nakamura K, Nonogaki M, Nanbu Y, Ban C, Fujii S, Mori T, Saga T. [Levels of CA130 in maternal sera and amniotic fluid at various gestational ages]. Nihon Sanka Fujinka Gakkai Zasshi 1990; 42:327-32. [PMID: 2193069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We examined the CA130 concentration in the amniotic fluid, maternal sera, amnion, chorion, decidua and placenta. CA130 in the maternal sera showed an initial increase during early pregnancy, remained low from the 15th weeks of pregnancy until delivery, and then increased after term delivery (249u/ml, mean, n = 27) or mid-trimester abortions (844u/ml, n = 22). The CA130, concentration in the amniotic fluid was high in the mid-trimester and remarkably low at term. Among the tissues examined, amnion and decidua contained a relatively high concentration of CA130. Immunohistochemical examination also demonstrated abundant CA130 in the cytosol of amnion and decidua tissues. The pattern of changes in CA130 in amniotic fluid was similar to that in the amnion and decidua tissue. The results suggest that the amnion cells are the source of CA130 in the amniotic fluid and that the high concentration of CA130 in maternal serum after delivery originates in decidua tissue affected by the separation of the placenta.
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Affiliation(s)
- F Kobayashi
- Department of Gynecology and Obstetrics, Faculty of Medicine, Kyoto University
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Kobayashi F, Sagawa N, Nanbu Y, Nakamura K, Nonogaki M, Ban C, Fujii S, Mori T. Immunohistochemical localization and tissue levels of tumor-associated glycoproteins CA 125 and CA 19-9 in the decidua and fetal membranes at various gestational ages. Am J Obstet Gynecol 1989; 160:1232-8. [PMID: 2729401 DOI: 10.1016/0002-9378(89)90202-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [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: 01/02/2023]
Abstract
To investigate the sources and biologic significance of CA 125 and CA 19-9 in amniotic fluid, immunohistochemical and biochemical localization of these tumor-associated glycoproteins in the decidua and fetal membranes was studied. Immunohistochemically, CA 125 and CA 19-9 were localized in the cytoplasm of decidua cells and amnion epithelial cells but not in the chorion and placental tissue. Biochemically, the 12,000 X g supernatant fractions of decidua and amnion tissues contained relatively large amounts of CA 125 and CA 19-9, 73% to 96% of which was present in the cytosolic fractions of these tissues. The CA 125 levels in the amniotic fluid decreased, whereas those of CA 19-9 increased with gestation, which correlated well with the respective levels in amnion tissues. These findings suggest that amnion cells produce and secrete these glycoproteins into the amniotic cavity. However, it is possible that the decidua also secretes CA 125 into the amniotic cavity through the chorion and amnion such as in the case of prolactin.
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Affiliation(s)
- F Kobayashi
- Faculty of Medicine, Department of Gynecology and Obstetrics, Kyoto University, Japan
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Kobayashi F, Sagawa N, Nakamura K, Nonogaki M, Ban C, Fujii S, Mori T. Mechanism and clinical significance of elevated CA 125 levels in the sera of pregnant women. Am J Obstet Gynecol 1989; 160:563-6. [PMID: 2929674 DOI: 10.1016/s0002-9378(89)80027-4] [Citation(s) in RCA: 47] [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: 01/03/2023]
Abstract
To clarify the mechanism of CA 125 elevation in maternal sera, serum levels of CA 125 and CA 19-9 were measured in 122 apparently healthy pregnant women (fifth to fortieth week of gestation) and 50 postpartum women (26 term deliveries and 24 second-trimester induced abortions). Serum levels of CA 125 showed an initial increase by the tenth week and then decreased to less than 35 U/ml, remaining below this level until delivery. However, within 1 hour after term delivery or second-trimester induced abortion, the CA 125 levels showed a second increase and decreased rapidly thereafter. In contrast, serum levels of CA 19-9 did not change significantly during these periods. Combined with our previous finding that the decidua contains abundant CA 125 but little CA 19-9, these results indicate that the elevated CA 125 levels in maternal sera originate from the decidual cells affected by chorionic invasion or the placental separation.
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Affiliation(s)
- F Kobayashi
- Department of Gynecology and Obstetrics, Faculty of Medicine, Kyoto University, Japan
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Ohara A, Mori T, Taii S, Ban C, Narimoto K. Functional differentiation in steroidogenesis of two types of luteal cells isolated from mature human corpora lutea of menstrual cycle. J Clin Endocrinol Metab 1987; 65:1192-200. [PMID: 3119652 DOI: 10.1210/jcem-65-6-1192] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Enriched small and large cell fractions were prepared from mature corpora lutea from 15 women in the midluteal phase by enzymatic dissociation, followed by Percoll gradient centrifugation. The steroidogenic function of each cell type was assessed by measuring the gonadal steroids released into the incubation medium. The large cell fraction was estimated to be 97% pure, with minimal contamination by small cells, whereas the small cell fraction was approximately 68% pure, being contaminated with 10% large cells and 22% nonsteroidogenic cells. In the unstimulated state, large cells were approximately 2-fold more potent in progesterone formation and aromatase activity, but only half as potent in androstenedione and testosterone formation as an equal number of small cells. When stimulated with hCG, the small cells responded with significant increases in progesterone, androstenedione, and testosterone release, but the large cells did not. Both cell types secreted estrone and 17 beta-estradiol in the presence of androgen substrate, but the addition of FSH significantly stimulated aromatization only in large cells. Thus, small and large human luteal cells have steroidogenic properties similar to those exhibited by follicular thecal and granulosa cells, respectively.
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Affiliation(s)
- A Ohara
- Department of Gynecology and Obstetrics, Kyoto University Faculty of Medicine, Japan
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Ban C, Billah MM, Truong CT, Johnston JM. Metabolism of platelet-activating factor (1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine) in human fetal membranes and decidua vera. Arch Biochem Biophys 1986; 246:9-18. [PMID: 3963833 DOI: 10.1016/0003-9861(86)90444-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We have previously reported that platelet-activating factor (PAF) is present in human amniotic fluid obtained from women in labor. We have also demonstrated that PAF, lyso-PAF, and alkyl acyl-sn-glycero-3-phosphocholine (AA-GPC) are present in human amnion tissue. In the reported study, we have investigated the enzymes involved in PAF metabolism in amnion tissue and their regulation. A phospholipase A2 activity has been demonstrated in amnion tissue which cleaves alkyl acyl (long-chain) sn-glycero-3-phosphocholine. The enzyme activity is not altered by Ca2+ and is distinctly different from the phospholipase A2 that we have previously characterized in this tissue. Amnion tissue contains acetyltransferase activity which requires Ca2+ and is associated with the microsomal fraction. Acetylhydrolase is also present in the cytosolic fraction of amnion tissue. Acetylhydrolase activity has also been demonstrated in amniotic fluid. The affinities of acetyltransferase (for lyso-PAF) and acetylhydrolase (for PAF) were unaffected by Ca2+. In the presence of Ca2+, however, the specific activity of acetyltransferase was increased four- to fivefold while that of acetylhydrolase was unaffected. Acetyltransferase and acetylhydrolase activities in fetal membranes and decidua were similar and were unchanged with gestational age. The possible role of PAF in the initiation of human parturition is discussed.
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Horie K, Ban C, Taii S, Mori T, Aso T. Impaired steroidogenic function of corpora lutea from hyperprolactinemic baboons induced by sulpiride. Endocrinol Jpn 1986; 33:211-4. [PMID: 3093203 DOI: 10.1507/endocrj1954.33.211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
It has been noticed that hyperprolactinemia can cause luteal insufficiency as well as anovulation in women. In order to explore the mechanism underlying this disorder, hyperprolactinemia was induced in baboons (Papio cynocephalus) by daily administration of sulpiride during follicular and early luteal phases. In hyperprolactinemic baboons, the plasma progesterone level was suppressed without notable changes in plasma estradiol, LH and FSH levels. When corpora lutea from these baboons were examined in vitro to investigate their ability to convert 14C-pregnenolone into various steroids, there was progressive inhibition of steroid metabolism related to the plasma levels of prolactin. These findings strongly suggest, although do not actually prove, that an elevated level of prolactin could directly impair luteal function by adversely affecting 3 beta-hydroxysteroid dehydrogenase activity.
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Billah MM, Di Renzo GC, Ban C, Truong CT, Hoffman DR, Anceschi MM, Bleasdale JE, Johnston JM. Platelet-activating factor metabolism in human amnion and the responses of this tissue to extracellular platelet-activating factor. Prostaglandins 1985; 30:841-50. [PMID: 3936121 DOI: 10.1016/0090-6980(85)90012-7] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
It was found previously that platelet-activating factor (PAF, 1-0-alkyl-2-acetyl-sn-glycero-3-phosphocholine) is undetectable in human amniotic fluid obtained before labor but is present in the majority of samples of amniotic fluid obtained after labor. In the present investigation, the amount of PAF in amnion tissue and the ability of this tissue to produce PAF and respond to PAF were investigated. Amounts of PAF in amnion obtained either during the second trimester of gestation or at term (before labor) were similar. After labor, however, the amount of PAF in amnion increased to 2.5-times that in amnion before labor without any discernible changes in the amounts of two related glycerophospholipids viz., 1-0-alkyl-sn-glycero-3-phosphocholine and 1-0-alkyl-2-acyl-sn-glycero-3-phosphocholine. The Ca2+-ionophore A23187, in the presence of Ca2+, caused an increase in the amount of PAF in amnion tissue disks but PAF did not appear to be released into the incubation medium. The stimulation of PAF formation by A23187 and Ca2+ was not affected by the addition of indomethacin. Addition of PAF to disks of amnion tissue resulted in an increase in the concentration of prostaglandin E2 in the incubation medium. An increase in prostaglandin E2 formation of similar magnitude was induced by A23187. Based on these results it is concluded that PAF can be synthesized in amnion tissue and net production is stimulated by Ca2+. In addition, amnion is receptive to extracellular PAF and exhibits, as one response, an increased production of prostaglandin E2.
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Abstract
Protein kinase C activity was demonstrated in cytosolic fractions prepared from human amnion and decidua vera tissues. The enzyme has been partially purified and was found to be glycerophospholipid-dependent. Phosphatidylserine was most active in the stimulation of protein kinase C. Ca2+ was also required for the expression of the enzyme activity. In the presence of unsaturated diacylglycerols, maximum activation of protein kinase C was observed at suboptimal concentrations of Ca2+. A possible role of phospholipid-dependent protein kinase C in the regulation of arachidonic acid release in this tissue is discussed.
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Abstract
Minute uterine leiomyomas, less than 3 mm in diameter, were studied by electron microscopy. In five of 15 cases, morphologically different types of smooth muscle cell were identified. In the central region of leiomyomas, most myoma cells were characterized by filaments sporadically located in the cytoplasm and well-developed organelles. These cells were interpreted as immature smooth muscle cells. In the outer layer of nodules, the cells were a more mature form of smooth muscle cell and resembled normal myometrial cells. The differences suggest that differentiation of the smooth muscle cells occurs early in the growth of uterine leiomyoma.
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Abstract
Multiple subperitoneal nodules were produced in the abdominal cavities of guinea pigs treated with various doses of estradiol benzoate for 3 months. Gland-like structures with intervening fibrous stroma were observed in 20% of these nodules. These gland-like structures resembled adenomatoid tumors, but were composed of cells that resembled mesothelium, ciliated cells, and cells with mucin in the cytoplasm. Some parts were composed of cells that had a squamous appearance. In guinea pigs, pretreatment with estradiol benzoate followed by treatment with a combination of estradiol benzoate and progesterone for 1 to 3 months produced nodules with gland-like structures similar to those produced by estrogen treatment alone. However, the gland-like structures were composed only of cells that resembled mesothelium and cells with cilia. Therefore, we conjecture that the formation of gland-like structures in the subperitoneal nodules is the result of mesothelial inclusions and their proliferation and that some of these mesothelial cells were differentiated into ciliated, mucinous, and squamous cells by estrogen.
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