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Huang Z, Zhang Z, Zhang R, Ding B, Yang L, Wu K, Xu Y, Zhong G, Ren C, Liu J, Hao Y, Wu M, Ma T, Liu B. An inorganic liquid crystalline dispersion with 2D ferroelectric moieties. Natl Sci Rev 2024; 11:nwae108. [PMID: 38680206 PMCID: PMC11055536 DOI: 10.1093/nsr/nwae108] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Accepted: 03/12/2024] [Indexed: 05/01/2024] Open
Abstract
Electro-optical effect-based liquid crystal devices have been extensively used in optical modulation techniques, in which the Kerr coefficient reflects the sensitivity of the liquid crystals and determines the strength of the device's operational electric field. The Peterlin-Stuart theory and the O'Konski model jointly indicate that a giant Kerr coefficient could be obtained in a material with both a large geometrical anisotropy and an intrinsic polarization, but such a material is not yet reported. Here we reveal a ferroelectric effect in a monolayer two-dimensional mineral vermiculite. A large geometrical anisotropy factor and a large inherent electric dipole together raise the record value of Kerr coefficient by an order of magnitude, till 3.0 × 10-4 m V-2. This finding enables an ultra-low operational electric field of 102-104 V m-1 and the fabrication of electro-optical devices with an inch-level electrode separation, which has not previously been practical. Because of its high ultraviolet stability (decay <1% under ultraviolet exposure for 1000 hours), large-scale production, and energy efficiency, prototypical displayable billboards have been fabricated for outdoor interactive scenes. This work provides new insights for both liquid crystal optics and two-dimensional ferroelectrics.
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Affiliation(s)
- Ziyang Huang
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Zehao Zhang
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Rongjie Zhang
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Baofu Ding
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
- Institute of Technology for Carbon Neutrality, Faculty of Materials Science and Engineering, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Liu Yang
- School of Physics and Institute for Quantum Science and Engineering, School of Chemistry and Institute of Theoretical Chemistry, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Keyou Wu
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Youan Xu
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
- Xi'an Research Institute of High Technology, Xi'an 710025, China
| | - Gaokuo Zhong
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Chuanlai Ren
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Jiarong Liu
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Yugan Hao
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Menghao Wu
- School of Physics and Institute for Quantum Science and Engineering, School of Chemistry and Institute of Theoretical Chemistry, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Teng Ma
- Department of Applied Physics, Hong Kong Polytechnic University, Hong Kong, China
| | - Bilu Liu
- Shenzhen Graphene Centre, Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
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Tan R, Chen X, Dai L, Ouyang Y, Cao L, Tang Z, Ma M, Wei X, Zhong G. Strong mechanical anisotropy and an anisotropic Dirac state in 2D C 5N 3. Phys Chem Chem Phys 2024; 26:11782-11788. [PMID: 38566583 DOI: 10.1039/d4cp00608a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Two-dimensional (2D) carbon nitride materials have emerged as a versatile platform for the design of high-performance nanoelectronics, but strong anisotropy in 2D carbon nitrides has rarely been reported. In this work, a 2D carbon nitride with strong anisotropy composed of tetra-, penta-, and hexa-rings (named as TPH-C5N3) is proposed. This TPH-C5N3 exhibits both dynamical and mechanical stability. Furthermore, it also showcases remarkable thermal stability, reaching up to 2300 K, as evidenced by AIMD simulations conducted in an NVT environment utilizing the Nosé-Hoover thermostat. Significantly, TPH-C5N3 demonstrates high anisotropic ratios in its mechanical properties, positioning it as the frontrunner in the current carbon nitride systems. In addition, a Dirac cone with an anisotropic ratio of 55.8% and Fermi velocity of 7.26 × 105 m s-1 is revealed in TPH-C5N3. The nontrivial topological properties of TPH-C5N3 are demonstrated by a non-zero Z2 invariant and topologically protected edge states. Our study offers theoretical insights into an anisotropic 2D carbon nitride material, laying the groundwork for its design and synthesis.
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Affiliation(s)
- Rui Tan
- Key Laboratory of Micro-nano Energy Materials and Application Technologies, University of Hunan Province & College of Physics and Electronics Engineering, Hengyang Normal University, Hengyang 421002, China.
| | - Xueqing Chen
- Key Laboratory of Micro-nano Energy Materials and Application Technologies, University of Hunan Province & College of Physics and Electronics Engineering, Hengyang Normal University, Hengyang 421002, China.
| | - Liyufen Dai
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China.
| | - Yulou Ouyang
- Key Laboratory of Micro-nano Energy Materials and Application Technologies, University of Hunan Province & College of Physics and Electronics Engineering, Hengyang Normal University, Hengyang 421002, China.
| | - Liemao Cao
- Key Laboratory of Micro-nano Energy Materials and Application Technologies, University of Hunan Province & College of Physics and Electronics Engineering, Hengyang Normal University, Hengyang 421002, China.
| | - Zhenkun Tang
- Key Laboratory of Micro-nano Energy Materials and Application Technologies, University of Hunan Province & College of Physics and Electronics Engineering, Hengyang Normal University, Hengyang 421002, China.
| | - Ming Ma
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China.
| | - Xiaolin Wei
- Key Laboratory of Micro-nano Energy Materials and Application Technologies, University of Hunan Province & College of Physics and Electronics Engineering, Hengyang Normal University, Hengyang 421002, China.
| | - Gaokuo Zhong
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China.
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Xu H, Liu J, Wei S, Luo J, Gong R, Tian S, Yang Y, Lei Y, Chen X, Wang J, Zhong G, Tang Y, Wang F, Cheng HM, Ding B. A multifunctional optoelectronic device based on 2D material with wide bandgap. Light Sci Appl 2023; 12:278. [PMID: 37989728 PMCID: PMC10663625 DOI: 10.1038/s41377-023-01327-8] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 11/02/2023] [Accepted: 11/03/2023] [Indexed: 11/23/2023]
Abstract
Low-dimensional materials exhibit unique quantum confinement effects and morphologies as a result of their nanoscale size in one or more dimensions, making them exhibit distinctive physical properties compared to bulk counterparts. Among all low-dimensional materials, due to their atomic level thickness, two-dimensional materials possess extremely large shape anisotropy and consequently are speculated to have large optically anisotropic absorption. In this work, we demonstrate an optoelectronic device based on the combination of two-dimensional material and carbon dot with wide bandgap. High-efficient luminescence of carbon dot and extremely large shape anisotropy (>1500) of two-dimensional material with the wide bandgap of >4 eV cooperatively endow the optoelectronic device with multi-functions of optically anisotropic blue-light emission, visible light modulation, wavelength-dependent ultraviolet-light detection as well as blue fluorescent film assemble. This research opens new avenues for constructing multi-function-integrated optoelectronic devices via the combination of nanomaterials with different dimensions.
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Affiliation(s)
- Hongwei Xu
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Jingwei Liu
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Sheng Wei
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Jie Luo
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Rui Gong
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Siyuan Tian
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, 528225, China
| | - Yiqi Yang
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, 528225, China
| | - Yukun Lei
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, 528225, China
| | - Xinman Chen
- School of Semiconductor Science and Technology, South China Normal University, Foshan, Guangdong, 528225, China
| | - Jiahong Wang
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
- Hubei Three Gorges Laboratory, Yichang, Hubei, 443007, China
| | - Gaokuo Zhong
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Yongbing Tang
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Feng Wang
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China.
| | - Hui-Ming Cheng
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China.
| | - Baofu Ding
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China.
- Shenzhen Geim Graphene Center (SGC), Tsinghua-Berkeley Shenzhen Institute (TBSI) & Tsinghua Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen, Guangdong, 518055, China.
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Zhang Y, Tan Y, Dong Y, Dai L, Ren C, Zhang F, Zeng L, An F, Li C, Huang B, Zhong G, Li J. High-Throughput Scanning Second-Harmonic-Generation Microscopy for Polar Materials. Adv Mater 2023; 35:e2300348. [PMID: 36916868 DOI: 10.1002/adma.202300348] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/06/2023] [Indexed: 05/12/2023]
Abstract
The Materials Genome Initiative aims to discover, develop, manufacture, and deploy advanced materials at twice the speed of conventional approaches. To achieve this, high-throughput characterization is essential for the rapid screening of candidate materials. In this study, a high-throughput scanning second-harmonic-generation microscope with automatic partitioning, accurate positioning, and fast scanning is developed that can rapidly probe and screen polar materials. Using this technique, typical ferroelectrics, including periodically poled lithium niobate crystals and PbZr0.2 Ti0.8 O3 (PZT) thin films are first investigated, whereby the microscopic domain structures are clearly revealed. This technique is then applied to a compositional-gradient (100-x)%BaTiO3 -x%SrTiO3 film and a thickness-gradient PZT film to demonstrate its high-throughput capabilities. Since the second-harmonic-generation signal is correlated with the macroscopic remnant polarization over the probed region determined by the laser spot, it is free of artifacts arising from leakage current and electrostatic interference, while materials' symmetries and domain structures must be carefully considered in the data analysis. It is believed that this work can help promote the high-throughput development of polar materials and contribute to the Materials Genome Initiative.
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Affiliation(s)
- Yuan Zhang
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Yangchun Tan
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, P. R. China
| | - Yangda Dong
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Liyufen Dai
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, P. R. China
| | - Chuanlai Ren
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, P. R. China
| | - Fengyuan Zhang
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Lingping Zeng
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, P. R. China
| | - Feng An
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, P. R. China
| | - Changjian Li
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Boyuan Huang
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Gaokuo Zhong
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, P. R. China
| | - Jiangyu Li
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
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Xu J, Li Y, Zhong G, Fang Z, Liu C, Ma C, Wang C, Guo Y, Liu C. [Directed differentiation of human induced pluripotent stem cells into midbrain]. Nan Fang Yi Ke Da Xue Xue Bao 2023; 43:175-182. [PMID: 36946035 PMCID: PMC10034547 DOI: 10.12122/j.issn.1673-4254.2023.02.03] [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] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
OBJECTIVE To establish an efficient protocol for directed differentiation of human induced pluripotent stem cells (hiPSCs) into functional midbrain dopaminergic progenitor cells (DAPs) in vitro. METHODS hiPSCs were induced to differentiate into DAPs in two developmental stages. In the first stage (the first 13 days), hiPSCs were induced into intermediate cells morphologically similar to primitive neuroepithelial cells (NECs) in neural induction medium containing a combination of small molecule compounds. In the second stage, the intermediate cells were further induced in neural differentiation medium until day 28 to obtain DAPs. After CM-DiI staining, the induced DAPs were stereotactically transplanted into the right medial forebrain bundle (MFB) of rat models of Parkinson's disease (PD). Eight weeks after transplantation, the motor behaviors of PD rats was evaluated. Immunofluorescence assay of brain sections of the rats was performed at 2 weeks after transplantation to observe the survival, migration and differentiation of the transplanted cells in the host brain microenvironment. RESULTS hiPSCs passaged stably on Matrigel showed a normal diploid karyotype, expressed the pluripotency markers OCT4, SOX2, and Nanog, and were positive for alkaline phosphatase. The primitive neuroepithelial cells obtained on day 13 formed dense cell colonies in the form of neural rosettes and expressed the neuroepithelial markers (SOX2, Nestin, and PAX6, 91.3%-92.8%). The DAPs on day 28 highly expressed the specific markers (TH, FOXA2, LMX1A and NURR1, 93.3-96.7%). In rat models of PD, the hiPSCs-DAPs survived and differentiated into TH+, FOXA2+ and Tuj1+ neurons at 2 weeks after transplantation. Eight weeks after transplantation, the motor function of PD rats was significantly improved as shown by water maze test (P < 0.0001) and apomorphine-induced rotation test (P < 0.0001) compared with rats receiving vehicle injection. CONCLUSION HiPSCs can be effectively induced to differentiate into DAPs capable of differentiating into functional neurons both in vivo and in vitro. In rat models of PD, the transplanted hiPSCs-DAPs can survive for more than 8 weeks in the MFB and differentiate into multiple functional neurocytes to ameliorate neurological deficits of the rats, suggesting the potential value of hiPSCs-DAPs transplantation for treatment of neurological diseases.
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Affiliation(s)
- J Xu
- School of Life Sciences, Bengbu Medical College, Bengbu 233000, China
| | - Y Li
- School of Life Sciences, Bengbu Medical College, Bengbu 233000, China
| | - G Zhong
- School of Laboratory Medicine, Bengbu Medical College, Bengbu 233000, China
| | - Z Fang
- School of Laboratory Medicine, Bengbu Medical College, Bengbu 233000, China
| | - C Liu
- School of Life Sciences, Bengbu Medical College, Bengbu 233000, China
| | - C Ma
- School of Life Sciences, Bengbu Medical College, Bengbu 233000, China
| | - C Wang
- School of Life Sciences, Bengbu Medical College, Bengbu 233000, China
| | - Y Guo
- School of Laboratory Medicine, Bengbu Medical College, Bengbu 233000, China
| | - C Liu
- School of Life Sciences, Bengbu Medical College, Bengbu 233000, China
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Zhong G, Ho SHK, Wong SJ. Environmental impact of high-flow nasal oxygenation. Anaesthesia 2023; 78:653. [PMID: 36632637 DOI: 10.1111/anae.15963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/06/2022] [Indexed: 01/13/2023]
Affiliation(s)
- G Zhong
- Westmead Hospital, Sydney, Australia
| | - S H K Ho
- Westmead Hospital, Sydney, Australia
| | - S J Wong
- Westmead Hospital, Sydney, Australia
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Yao D, Tang Z, Liang Z, Zhang L, Sun QJ, Fan J, Zhong G, Liu QX, Jiang YP, Tang XG, A. L. Roy V, Ouyang J. Adhesive, multifunctional, and wearable electronics based on MXene-coated textile for personal heating systems, electromagnetic interference shielding, and pressure sensing. J Colloid Interface Sci 2022; 630:23-33. [DOI: 10.1016/j.jcis.2022.09.003] [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] [Received: 07/07/2022] [Revised: 08/18/2022] [Accepted: 09/01/2022] [Indexed: 11/26/2022]
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Zhong G, Massey L, Thomas S, Ghosh B. 235 Assessing coding of diagnosis for atypical parkinsonian syndromes. J Neurol Neurosurg Psychiatry 2022. [DOI: 10.1136/jnnp-2022-abn.264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BackgroundAtypical Parkinsonian syndromes, including Progressive Supranuclear Palsy (PSP), Multiple System Atrophy (MSA) and Corticobasal Syndrome (CBS), are rare neurodegenerative diseases. Reports showed that the use of the health services for patients with these diseases is underestimated. The NHS uses International Classification of Disease revision 10 (ICD-10) to code health use which has led to error in patient data for these diseases, as they are relatively new entries to this system and there were changes in coding practice in 2016.AimsTo retrospectively investigate the scale of miscoding of PSP, MSA and CBS in England since the introduction of ICD-10.MethodsFreedom of information requests were issued to 150 NHS trusts in England to investigate their method of coding and determine the coding error rate.ResultsThe coding error rates prior to, and after 2016 respectively were: 29.5%, 0% (PSP); 3.8%, 2.3% (MSA); 24.2%, 24.2% (CBS). The indexing for CBS is difficult as no specific coding exists for CBS in ICD-10.ConclusionThe high error rate for PSP is contributed by miscoding of PSP (G23.1) as MND (G12.2), due to the coding techniques employed. These errors have largely been rectified in later versions of ICD-10 with the exception of CBS.ggz1g17@soton.ac.uk
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Zhong G, An F, Qu K, Dong Y, Yang Z, Dai L, Xie S, Huang R, Luo Z, Li J. Highly Flexible Freestanding BaTiO 3 -CoFe 2 O 4 Heteroepitaxial Nanostructure Self-Assembled with Room-Temperature Multiferroicity. Small 2022; 18:e2104213. [PMID: 34816590 DOI: 10.1002/smll.202104213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 09/28/2021] [Indexed: 06/13/2023]
Abstract
Multiferroics with simultaneous electric and magnetic orderings are highly desirable for sensing, actuation, data storage, and bio-inspired systems, yet developing flexible materials with robust multiferroic properties at room temperature is a long-term challenge. Utilizing water-soluble Sr3 Al2 O6 as a sacrificial layer, the authors have successfully self-assembled a freestanding BaTiO3 -CoFe2 O4 heteroepitaxial nanostructure via pulse laser deposition, and confirmed its epitaxial growth in both out-of-plane and in-plane directions, with highly ordered CoFe2 O4 nanopillars embedded in a single crystalline BaTiO3 matrix free of substrate constraint. The freestanding nanostructure enjoys super flexibility and mechanical integrity, not only capable of spontaneously curving into a roll, but can also be bent with a radius as small as 4.23 µm. Moreover, piezoelectricity and ferromagnetism are demonstrated at both microscopic and macroscopic scales, confirming its robust multiferroicity at room temperature. This work establishes an effective route for flexible multiferroic materials, which have the potential for various practical applications.
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Affiliation(s)
- Gaokuo Zhong
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Feng An
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Ke Qu
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Yongqi Dong
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China
| | - Zhenzhong Yang
- Key Laboratory of Polar Materials and Devices, East China Normal University, Shanghai, Shanghai, 200241, China
| | - Liyufen Dai
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Shuhong Xie
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Rong Huang
- Key Laboratory of Polar Materials and Devices, East China Normal University, Shanghai, Shanghai, 200241, China
| | - Zhenlin Luo
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China
| | - Jiangyu Li
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
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Jin C, Zhu Y, Li X, An F, Han W, Liu Q, Hu S, Ji Y, Xu Z, Hu S, Ye M, Zhong G, Gu M, Chen L. Super-Flexible Freestanding BiMnO 3 Membranes with Stable Ferroelectricity and Ferromagnetism. Adv Sci (Weinh) 2021; 8:e2102178. [PMID: 34713629 PMCID: PMC8693045 DOI: 10.1002/advs.202102178] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/19/2021] [Indexed: 06/13/2023]
Abstract
Multiferroic materials with flexibility are expected to make great contributions to flexible electronic applications, such as sensors, memories, and wearable devices. In this work, super-flexible freestanding BiMnO3 membranes with simultaneous ferroelectricity and ferromagnetism are synthesized using water-soluble Sr3 Al2 O6 as the sacrificial buffer layer. The super-flexibility of BiMnO3 membranes is demonstrated by undergoing an ≈180° folding during an in situ bending test, which is consistent with the results of first-principles calculations. The piezoelectric signal under a bending radius of ≈500 µm confirms the stable existence of electric polarization in freestanding BiMnO3 membranes. Moreover, the stable ferromagnetism of freestanding BiMnO3 membranes is demonstrated after 100 times bending cycles with a bending radius of ≈2 mm. 5.1% uniaxial tensile strain is achieved in freestanding BiMnO3 membranes, and the piezoresponse force microscopy (PFM) phase retention behaviors confirm that the ferroelectricity of membranes can survive stably up to the strain of 1.7%. These super-flexible membranes with stable ferroelectricity and ferromagnetism pave ways to the realizations of multifunctional flexible electronics.
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Affiliation(s)
- Cai Jin
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
- School of PhysicsHarbin Institute of TechnologyHarbin150081China
| | - Yuanmin Zhu
- Academy for Advanced Interdisciplinary StudiesSouthern University of Science and TechnologyShenzhen518055China
- Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen518055China
| | - Xiaowen Li
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
| | - Feng An
- Shenzhen Key Laboratory of NanobiomechanicsShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
| | - Wenqiao Han
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
| | - Qi Liu
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
| | - Sixia Hu
- Materials Characterization and Preparation CenterSouthern University of Science and TechnologyShenzhen518055China
| | - Yanjiang Ji
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
| | - Zedong Xu
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
| | - Songbai Hu
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
| | - Mao Ye
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
| | - Gaokuo Zhong
- Shenzhen Key Laboratory of NanobiomechanicsShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
| | - Meng Gu
- Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen518055China
| | - Lang Chen
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
- Materials Characterization and Preparation CenterSouthern University of Science and TechnologyShenzhen518055China
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11
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Zhang Y, Dai J, Zhong X, Zhang D, Zhong G, Li J. Probing Ultrafast Dynamics of Ferroelectrics by Time-Resolved Pump-Probe Spectroscopy. Adv Sci (Weinh) 2021; 8:e2102488. [PMID: 34632722 PMCID: PMC8596111 DOI: 10.1002/advs.202102488] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/29/2021] [Indexed: 05/26/2023]
Abstract
Ferroelectric materials have been a key research topic owing to their wide variety of modern electronic and photonic applications. For the quick exploration of higher operating speed, smaller size, and superior efficiencies of novel ferroelectric devices, the ultrafast dynamics of ferroelectrics that directly reflect their respond time and lifetimes have drawn considerable attention. Driven by time-resolved pump-probe spectroscopy that allows for probing, controlling, and modulating dynamic processes of ferroelectrics in real-time, much research efforts have been made to understand and exploit the ultrafast dynamics of ferroelectric. Herein, the current state of ultrafast dynamic features of ferroelectrics tracked by time-resolved pump-probe spectroscopy is reviewed, which includes ferroelectrics order parameters of polarization, lattice, spin, electronic excitation, and their coupling. Several potential perspectives and possible further applications combining ultrafast pump-probe spectroscopy and ferroelectrics are also presented. This review offers a clear guidance of ultrafast dynamics of ferroelectric orders, which may promote the rapid development of next-generation devices.
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Affiliation(s)
- Yuan Zhang
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Junfeng Dai
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Xiangli Zhong
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Dongwen Zhang
- Department of Physics, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha, Hunan, 410073, China
| | - Gaokuo Zhong
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
| | - Jiangyu Li
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, China
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
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12
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Wu X, Zhong G, Wang H, Zhu J. Temporal association between antibiotic use and resistance in Gram-negative bacteria. BRAZ J BIOL 2021; 83:e239323. [PMID: 34524371 DOI: 10.1590/1519-6984.239323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 01/01/2021] [Indexed: 11/22/2022] Open
Abstract
The β-lactam/lactamase inhibitors (BLBLIs) combination drugs are considered an effective alternative to carbapenems. However, there is a growing concern that the increased use of BLBLIs may lead to increased resistance. This study determined the temporal association between the consumption of BLBLI and the antimicrobial resistance in Gram-negative bacteria. In this retrospective study, electronic data on the Gram-negative bacterial isolates, including A. baumannii, P. aeruginosa, E. coli, and K. pneumoniae from in-patients and susceptibility testing results were retrieved from the medical records of the clinical laboratory. A linear regression and cross-correlation analysis were performed on the acquired data. Increasing trends (p<0.05) in the consumption of BIBLI and carbapenem with a median use of 27.68 and 34.46 DDD/1000 PD per quarter were observed, respectively. A decreased trend (p=0.023) in the consumption of fluoroquinolones with a median use of 29.13 DDD/1000 PD per quarter was observed. The resistance rate of K. pneumoniae was synchronized with the BIBLI and carbapenem consumptions with a correlation coefficient of 0.893 (p=0.012) and 0.951 (p=0.016), respectively. The cross-correlation analysis against the consumption of BIBLI and meropenem resistant K. pneumoniae was peaked at 0-quarter lag (r=951, p=0.016). There was an increasing trend in the consumption of BLBLI and carbapenems. The increasing trend in the rates of resistance to piperacillin/tazobactam, in line with the increasing consumption of BLBLI, suggests that BLBLI has to be used with caution and cannot be directly considered as a long-term alternative to carbapenems.
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Affiliation(s)
- X Wu
- Central South University, Affiliated Haikou Hospital of Xiangya Medical College, Department of Clinical Laboratory, Haikou, Hainan, China
| | - G Zhong
- Haikou Hospital of the Maternal and Child Health, Department of Pharmacy, Haikou, Hainan, China
| | - H Wang
- Hainan Provincial People's Hospital (Hainan Hospital Affiliated to Hainan Medical College), Department of Health Management Centre, Haikou, Hainan, China
| | - J Zhu
- The Third Xiangya Hospital of Central South University, Department of Laboratory Medicine, Changsha, Hunan, China
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13
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Dai L, Zhong X, Zou J, Fu B, Su Y, Ren C, Wang J, Zhong G. Highly Ordered SnO 2 Nanopillar Array as Binder-Free Anodes for Long-Life and High-Rate Li-Ion Batteries. Nanomaterials (Basel) 2021; 11:nano11051307. [PMID: 34063408 PMCID: PMC8156522 DOI: 10.3390/nano11051307] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/04/2021] [Accepted: 05/07/2021] [Indexed: 12/26/2022]
Abstract
SnO2, a typical transition metal oxide, is a promising conversion-type electrode material with an ultrahigh theoretical specific capacity of 1494 mAh g−1. Nevertheless, the electrochemical performance of SnO2 electrode is limited by large volumetric changes (~300%) during the charge/discharge process, leading to rapid capacity decay, poor cyclic performance, and inferior rate capability. In order to overcome these bottlenecks, we develop highly ordered SnO2 nanopillar array as binder-free anodes for LIBs, which are realized by anodic aluminum oxide-assisted pulsed laser deposition. The as-synthesized SnO2 nanopillar exhibit an ultrahigh initial specific capacity of 1082 mAh g−1 and maintain a high specific capacity of 524/313 mAh g−1 after 1100/6500 cycles, outperforming SnO2 thin film-based anodes and other reported binder-free SnO2 anodes. Moreover, SnO2 nanopillar demonstrate excellent rate performance under high current density of 64 C (1 C = 782 mA g−1), delivering a specific capacity of 278 mAh g−1, which can be restored to 670 mAh g−1 after high-rate cycling. The superior electrochemical performance of SnO2 nanoarray can be attributed to the unique architecture of SnO2, where highly ordered SnO2 nanopillar array provided adequate room for volumetric expansion and ensured structural integrity during the lithiation/delithiation process. The current study presents an effective approach to mitigate the inferior cyclic performance of SnO2-based electrodes, offering a realistic prospect for its applications as next-generation energy storage devices.
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Affiliation(s)
- Liyufen Dai
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; (L.D.); (J.Z.); (B.F.); (C.R.)
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China; (X.Z.); (Y.S.); (J.W.)
| | - Xiangli Zhong
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China; (X.Z.); (Y.S.); (J.W.)
| | - Juan Zou
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; (L.D.); (J.Z.); (B.F.); (C.R.)
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China; (X.Z.); (Y.S.); (J.W.)
| | - Bi Fu
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; (L.D.); (J.Z.); (B.F.); (C.R.)
| | - Yong Su
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China; (X.Z.); (Y.S.); (J.W.)
| | - Chuanlai Ren
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; (L.D.); (J.Z.); (B.F.); (C.R.)
| | - Jinbin Wang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China; (X.Z.); (Y.S.); (J.W.)
| | - Gaokuo Zhong
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; (L.D.); (J.Z.); (B.F.); (C.R.)
- Correspondence:
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14
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Liang WL, Li HG, Zhong G, Wang BS, Ma JD, Chen JL, Mao HW, Yu-Lung YL, Lee PH. [Targeted therapy of pyogenic sterile arthritis, pyoderma gangrenosum, and acne syndrome (PAPA): a case report and literature review]. Zhonghua Er Ke Za Zhi 2020; 58:977-981. [PMID: 33256319 DOI: 10.3760/cma.j.cn112140-20200430-00456] [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] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Objective: To analyze the clinical course and targeted therapy of pyogenic sterile arthritis, pyoderma gangrenosum, and acne (PAPA) syndrome. Methods: The clinical history of a 6-year-old boy with PAPA syndrome, who was admitted to Hong Kong University Shenzhen Hospital in September 2017, was reviewed. His genetic diagnosis was confirmed by whole exome sequencing. The response to targeted therapy was evaluated by comparing the inflammatory markers (erythrocyte sedimentation rate (ESR) and C reactive protein (CRP) and serum cytokines (interleukin (IL)-1, IL-6 and tumor necrosis factor-α (TNF-α)) before and after biological agents treatment. For literature review, "PAPA syndrome" and"PSTPIP1 gene"were used as keywords to retrieve papers published from January 1997 to December 2019 from Pubmed, Wanfang and CNKI database. Results: The patient was a 6-year-old boy, admitted to the hospital due to recurrent joint swelling and pain for more than 4 years. Before treatment, the CRP (256 mg/L), ESR (105 mm/1 h) and cytokines including serum TNF-α (7.43 ng/L), IL-1 (<5 ng/L), IL-6 (301 ng/L) were significantly elevated. Culture of the joint effusion was negative, but the IL-6 level was above 1 000 ng/L. MRI showed osteomyelitis at the lower end of the right femur. Gene detection found a heterozygous variation of PSTPIP1 gene (c.748G>A, p.E250K). Arthralgia once alleviated after the initiation of tocilizumab and infliximab, but recurred after 1 year of treatment. Thereafter, the anti-IL-1 receptor antagonist (Anakinra) was commenced, followed by a significant improvement of the arthralgia, and a complete remission during the follow-up. Besides, the level of CRP, ESR, serum TNF-α, IL-1 and IL-6 were all decreased to normal on the last followed up in December 2019. Literature review found 29 articles and 87 patients in total. The initial symptoms included those of arthritis (n=58), pyoderma gangrenosum (n=33), and acne (n=24). Among all the cases, 13 genotypes were confirmed, and 47 variations involved amino acid p.E250. Steroid and/or biological agents were used in most patients. Conclusions: PAPA syndrome should be suspected in children with recurrent pyogenic sterile arthritis, and an early diagnosis could be achieved by genetic test. Targeted treatment with biological agent may control the symptoms effectively. Biological agents can control symptoms of this disorder effectively.
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Affiliation(s)
- W L Liang
- Department of Paediatrics, Hong Kong University Shenzhen Hospital, Shenzhen 518000, China
| | - H G Li
- Department of Paediatrics, Hong Kong University Shenzhen Hospital, Shenzhen 518000, China
| | - G Zhong
- Department of Paediatrics, Hong Kong University Shenzhen Hospital, Shenzhen 518000, China
| | - B S Wang
- Department of Paediatrics, Hong Kong University Shenzhen Hospital, Shenzhen 518000, China
| | - J D Ma
- Department of Rheumatology, Sun Yat-Sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510000, China
| | - J L Chen
- Department of Paediatrics, Hong Kong University Shenzhen Hospital, Shenzhen 518000, China
| | - H W Mao
- Department of Paediatrics, Hong Kong University Shenzhen Hospital, Shenzhen 518000, China
| | - Y L Yu-Lung
- Department of Paediatrics, Hong Kong University Shenzhen Hospital, Shenzhen 518000, China
| | - P H Lee
- Department of Paediatrics, Hong Kong University Shenzhen Hospital, Shenzhen 518000, China
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15
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Huang J, Yang B, Tan J, Zhou S, Chen Z, Zhong G, Gao H, Zhu J, Zeng J, Zhong L, Liu X, Han F. Gastric cancer nodal tumour-stroma ratios influence prognosis. Br J Surg 2020; 107:1713-1718. [PMID: 33090456 PMCID: PMC7702113 DOI: 10.1002/bjs.12054] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 07/06/2020] [Accepted: 08/18/2020] [Indexed: 11/05/2022]
Abstract
This study showed that nodal tumour-stroma ratio (NTSR) is an independent prognostic factor for overall and disease-free survival of patients with gastric cancer. Both relative stroma-rich primary tumour-stroma ratio (PTSR) and NTSR were independent negative prognostic factors for overall survival in gastric cancer. This study supports assessment of tumour-stroma ratio in the routine pathological diagnosis of gastric cancer. validated in node-positive disease.
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Affiliation(s)
- J Huang
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - B Yang
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - J Tan
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - S Zhou
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Z Chen
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - G Zhong
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - H Gao
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - J Zhu
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - J Zeng
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - L Zhong
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - X Liu
- Zhu Jiang Hospital of Southern Medical University, Southern Medical University, Guangzhou, China
| | - F Han
- Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
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16
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Zhong G, Su Y, Lin T. circRIP2 accelerates bladder cancer progression via miR-1305/Tgf-β2/smad3 pathway. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)32841-x] [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: 11/25/2022] Open
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17
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Liu C, An F, Gharavi PSM, Lu Q, Zha J, Chen C, Wang L, Zhan X, Xu Z, Zhang Y, Qu K, Yao J, Ou Y, Zhao Z, Zhong X, Zhang D, Valanoor N, Chen L, Zhu T, Chen D, Zhai X, Gao P, Jia T, Xie S, Zhong G, Li J. Large-scale multiferroic complex oxide epitaxy with magnetically switched polarization enabled by solution processing. Natl Sci Rev 2020; 7:84-91. [PMID: 34692020 PMCID: PMC8289034 DOI: 10.1093/nsr/nwz143] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/27/2019] [Accepted: 08/28/2019] [Indexed: 11/14/2022] Open
Abstract
Complex oxides with tunable structures have many fascinating properties, though high-quality complex oxide epitaxy with precisely controlled composition is still out of reach. Here we have successfully developed solution-based single-crystalline epitaxy for multiferroic (1-x)BiTi(1-y)/2Fe y Mg(1-y)/2O3-(x)CaTiO3 (BTFM-CTO) solid solution in large area, confirming its ferroelectricity at the atomic scale with strong spontaneous polarization. Careful compositional tuning leads to a bulk magnetization of 0.07 ± 0.035 μB/Fe at room temperature, enabling magnetically induced polarization switching exhibiting a large magnetoelectric coefficient of 2.7-3.0 × 10-7 s/m. This work demonstrates the great potential of solution processing in large-scale complex oxide epitaxy and establishes novel room-temperature magnetoelectric coupling in epitaxial BTFM-CTO film, making it possible to explore a much wider space of composition, phase, and structure that can be easily scaled up for industrial applications.
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Affiliation(s)
- Cong Liu
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
| | - Feng An
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
| | - Paria S M Gharavi
- School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Qinwen Lu
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Junkun Zha
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Chao Chen
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Liming Wang
- Dongguan Neutron Science Center, Dongguan 523803, China
| | - Xiaozhi Zhan
- Dongguan Neutron Science Center, Dongguan 523803, China
| | - Zedong Xu
- Department of Physics, Southern University of Science and Technology, Shenzhen 518005, China
| | - Yuan Zhang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
| | - Ke Qu
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
- International Center for Quantum Materials and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China
| | - Junxiang Yao
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
| | - Yun Ou
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
- Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Zhiming Zhao
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
| | - Xiangli Zhong
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
| | - Dongwen Zhang
- Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, China
| | - Nagarajan Valanoor
- School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Lang Chen
- Department of Physics, Southern University of Science and Technology, Shenzhen 518005, China
| | - Tao Zhu
- Dongguan Neutron Science Center, Dongguan 523803, China
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan Neutron Science Center, Dongguan 523808, China
| | - Deyang Chen
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Xiaofang Zhai
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Peng Gao
- International Center for Quantum Materials and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China
| | - Tingting Jia
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
| | - Shuhong Xie
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
| | - Gaokuo Zhong
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
| | - Jiangyu Li
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
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18
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Peng X, Dasgupta S, Zhong G, Du M, Xu H, Chen M, Chen S, Ta K, Li J. Large debris dumps in the northern South China Sea. Mar Pollut Bull 2019; 142:164-168. [PMID: 31232290 DOI: 10.1016/j.marpolbul.2019.03.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 03/13/2019] [Accepted: 03/20/2019] [Indexed: 06/09/2023]
Abstract
Knowledge of the abundance, source, and fate of marine debris in the deep sea is largely constrained thus far. Here, we report the existence of large deep-sea debris dumps that have not been reported before on the seafloor worldwide. Marine debris remarkably accumulated at ~1700-1800 m in the tributary submarine canyons of the Xisha Trough, northern South China Sea (SCS). Although marine debris in Xisha Trough is patchy, the debris abundance was as high as 36,818 and 51,929 items/km2 at locations SY78 and SY82, respectively, which is one order of magnitude higher than that in other submarine canyons. We propose that most of the debris came from fishery and navigation activities, as indicated by the categories of debris collected from the seafloor dumps. Seasonal surface ocean currents of the SCS and geomorphology of submarine canyons possibly influence the movement of the debris from coasts to the deep seafloor.
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Affiliation(s)
- X Peng
- Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan 572000, China
| | - S Dasgupta
- Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan 572000, China.
| | - G Zhong
- State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
| | - M Du
- Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan 572000, China
| | - H Xu
- Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan 572000, China
| | - M Chen
- Institute of Marine Geology and Resources, Ocean College, Zhejiang University, Zhoushan 316021, China; Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan 572000, China
| | - S Chen
- Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan 572000, China
| | - K Ta
- Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan 572000, China
| | - J Li
- Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan 572000, China
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19
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Li X, Guan L, Zilundu PLM, Chen J, Chen Z, Ma M, Zhuang H, Zhuang Z, Qiu Y, Ye F, Wu X, Sang H, Ye Y, Han Y, Yao H, Li H, Zhong G, Wu H, Jiang Z, Chu G, Xu D, Zhou L. The applied anatomy and clinical significance of the proximal, V1 segment of vertebral artery. Folia Morphol (Warsz) 2019; 78:710-719. [PMID: 30949997 DOI: 10.5603/fm.a2019.0039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 12/31/2018] [Revised: 03/05/2019] [Accepted: 03/06/2019] [Indexed: 11/25/2022]
Abstract
BACKGROUND The aim of the study was to probe the morphological features of the proximal segment (V1) of vertebral artery (VA) in a sample of Chinese cadavers. MATERIALS AND METHODS The origin, course and outer diameter at origin of the pre-vertebral part of the VAs were evaluated in 119 adult cadavers. RESULTS It was found that 94.12% of the VAs originated from the subclavian arteries, bilaterally. The variant origins were present in 5.88% of the cadavers and all originated directly from the arch of the aorta. All the variations were observed on the left side of male cadavers. The average outer diameters at origin of the normal and variation groups were 4.35 ± 1.00 mm and 4.82 ± ± 1.42 mm, respectively, p = 0.035. In the normal group, but not in the variation group, the average diameter in the males was significantly larger than that in the females (4.50 ± 0.99 mm, 3.92 ± 0.92 mm, respectively, p = 0.000). In addition, only 5 cadavers in the normal group had hypoplastic VAs (4.20%, 4 males, 3 right-sided). Vertebral artery dominance (VAD) was present in 91 (69 males) out of 112 cadavers and more common on the left (n = 48). In addition, 3 cadavers satisfied conditions for coexistence of VAD and vertebral artery hypoplasia. All 7 cadavers in the variation group exhibited VAD, which was more common on the right side (n = 5). CONCLUSIONS The morphologic variations and frequencies described above have implications for the early prevention, abnormal anatomy detection, accurate diagnosis, safe surgery and endovascular treatment of cardiovascular and neurological disease.
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Affiliation(s)
- X Li
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - L Guan
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - Prince L M Zilundu
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - J Chen
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - Z Chen
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - M Ma
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - H Zhuang
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - Z Zhuang
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - Y Qiu
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - F Ye
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - X Wu
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - H Sang
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - Y Ye
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - Y Han
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - H Yao
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - H Li
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - G Zhong
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - H Wu
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - Z Jiang
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - G Chu
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
| | - D Xu
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China.
| | - L Zhou
- Department of Human Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China.,Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou City, Guangdong Province, China
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Zhong G, An F, Bitla Y, Wang J, Zhong X, Yu J, Gao W, Zhang Y, Tan C, Ou Y, Jiang J, Hsieh YH, Pan X, Xie S, Chu YH, Li J. Deterministic, Reversible, and Nonvolatile Low-Voltage Writing of Magnetic Domains in Epitaxial BaTiO 3/Fe 3O 4 Heterostructure. ACS Nano 2018; 12:9558-9567. [PMID: 30138564 DOI: 10.1021/acsnano.8b05284] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The ability to electrically write magnetic bits is highly desirable for future magnetic memories and spintronic devices, though fully deterministic, reversible, and nonvolatile switching of magnetic moments by electric field remains elusive despite extensive research. In this work, we develop a concept to electrically switch magnetization via polarization modulated oxygen vacancies, and we demonstrate the idea in a multiferroic epitaxial heterostructure of BaTiO3/Fe3O4 fabricated by pulsed laser deposition. The piezoelectricity and ferroelectricity of BaTiO3 have been confirmed by macro- and microscale measurements, for which Fe3O4 serves as the top electrode for switching the polarization. X-ray absorption spectroscopy and X-ray magnetic circular dichroism spectra indicate a mixture of Fe2+ and Fe3+ at O h sites and Fe3+ at T d sites in Fe3O4, while the room-temperature magnetic domains of Fe3O4 are revealed by microscopic magnetic force microscopy measurements. It is demonstrated that the magnetic domains of Fe3O4 can be switched by not only magnetic fields but also electric fields in a deterministic, reversible, and nonvolatile manner, wherein polarization reversal by electric field modulates the oxygen vacancy distribution in Fe3O4, and thus its magnetic state, making it attractive for electrically written magnetic memories.
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Affiliation(s)
- Gaokuo Zhong
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology , Chinese Academy of Sciences , Shenzhen 518055 , Guangdong , China
- Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and School of Materials Science and Engineering , Xiangtan University , Xiangtan 411105 , Hunan , China
- Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan
- Department of Chemical Engineering and Materials Science , University of California, Irvine , Irvine 92697 , California , United States
| | - Feng An
- Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and School of Materials Science and Engineering , Xiangtan University , Xiangtan 411105 , Hunan , China
| | - Yugandhar Bitla
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
| | - Jinbin Wang
- Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and School of Materials Science and Engineering , Xiangtan University , Xiangtan 411105 , Hunan , China
| | - Xiangli Zhong
- Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and School of Materials Science and Engineering , Xiangtan University , Xiangtan 411105 , Hunan , China
| | - Junxi Yu
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology , Chinese Academy of Sciences , Shenzhen 518055 , Guangdong , China
- Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and School of Materials Science and Engineering , Xiangtan University , Xiangtan 411105 , Hunan , China
| | - Wenpei Gao
- Department of Chemical Engineering and Materials Science , University of California, Irvine , Irvine 92697 , California , United States
| | - Yi Zhang
- Department of Chemical Engineering and Materials Science , University of California, Irvine , Irvine 92697 , California , United States
| | - Congbing Tan
- Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and School of Materials Science and Engineering , Xiangtan University , Xiangtan 411105 , Hunan , China
| | - Yun Ou
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology , Chinese Academy of Sciences , Shenzhen 518055 , Guangdong , China
| | - Jie Jiang
- Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and School of Materials Science and Engineering , Xiangtan University , Xiangtan 411105 , Hunan , China
| | - Ying-Hui Hsieh
- Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan
| | - Xiaoqing Pan
- Department of Chemical Engineering and Materials Science , University of California, Irvine , Irvine 92697 , California , United States
| | - Shuhong Xie
- Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and School of Materials Science and Engineering , Xiangtan University , Xiangtan 411105 , Hunan , China
| | - Ying-Hao Chu
- Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan
| | - Jiangyu Li
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology , Chinese Academy of Sciences , Shenzhen 518055 , Guangdong , China
- Department of Mechanical Engineering , University of Washington , Seattle 98195 , Washington , United States
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21
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Guan Y, He F, Wu J, Zhao L, Wang X, Huang L, Zeng G, Ren B, Chen J, Liao X, Ma Z, Chen X, Zhong G, Huang M, Zhao X. A long-acting pegylated recombinant human growth hormone (Jintrolong ® ) in healthy adult subjects: Two single-dose trials evaluating safety, tolerability and pharmacokinetics. J Clin Pharm Ther 2018; 43:640-646. [PMID: 29959799 DOI: 10.1111/jcpt.12732] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 06/09/2018] [Indexed: 12/20/2022]
Abstract
WHAT IS KNOWN AND OBJECTIVE Jintrolong® is a pegylated recombinant human growth hormone (rhGH) (PEG-rhGH) developed for weekly subcutaneous (sc) injection. The current human tolerability trial and pharmacokinetics (PK) trial evaluated the safety, tolerability and PK of single-dose Jintrolong® injection in healthy adult subjects. METHODS Both trials were single-centre, randomized, open-label and single-dose studies. In the human tolerability trial, 34 healthy subjects were randomized to receive single-dose Jintrolong® sc injection (0.01, 0.06, 0.2, 0.5 or 0.8 mg/kg) or placebo. In the PK study, 30 healthy male subjects were evenly randomized into 3 groups to receive single-dose Jintrolong® sc injection (0.1, 0.2 or 0.4 mg/kg), and the subjects receiving 0.4 mg/kg Jintrolong® were given a single sc injection of conventional rhGH (0.067 mg/kg) after a 14-day washout period. Safety and PK profiles of Jintrolong® were evaluated. RESULTS AND DISCUSSION Jintrolong® was well tolerated with no serious adverse events or local injection responses. The PK trial showed that the plasma growth hormone concentration elevated quickly and stayed at peak level between 12 and 48 hours post-Jintrolong® injection, then decreased gradually back to baseline within 168 hours. Compared to single-dose conventional rhGH, Jintrolong® at all doses demonstrated significantly longer half time and time to maximum plasma concentration, lower clearance and higher systemic drug exposure, indicating prolonged presence of GH in the subjects' circulation. Additionally, systemic exposure to Jintrolong® increased in a dose-dependent manner. WHAT IS NEW AND CONCLUSION Single-dose Jintrolong® injection was well tolerated in healthy adult subjects, and the maximum tolerable dose was no lower than 0.8 mg/kg. Jintrolong® was long-acting with the potential for weekly administration.
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Affiliation(s)
- Y Guan
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - F He
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China.,Department of Pharmacy, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - J Wu
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - L Zhao
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - X Wang
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - L Huang
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - G Zeng
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - B Ren
- The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - J Chen
- The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - X Liao
- The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Z Ma
- The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - X Chen
- The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - G Zhong
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - M Huang
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - X Zhao
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
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22
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Chen L, Zhao W, Zhong G, Watts C, Gunn JP, Liu X, Lian Y, DLP Team. Thermal Analysis on Various Design Concepts of ITER Divertor Langmuir Probes. Fusion Science and Technology 2018. [DOI: 10.1080/15361055.2017.1415614] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- L. Chen
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - W. Zhao
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - G. Zhong
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - C. Watts
- ITER Organization, Route de Vinon-sur-Verdon, CS 90046, 13067 St. Paul Lez Durance Cedex, France
| | | | - X. Liu
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - Y. Lian
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - DLP Team
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
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23
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Chen Y, Yan S, Xu M, Zhong G, Liebeskind DS, Lou M. More extensive white matter hyperintensity is linked with higher risk of remote intracerebral hemorrhage after intravenous thrombolysis. Eur J Neurol 2017; 25:380-e15. [PMID: 29115734 DOI: 10.1111/ene.13517] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2017] [Accepted: 11/02/2017] [Indexed: 11/27/2022]
Affiliation(s)
- Y. Chen
- Department of Neurology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
| | - S. Yan
- Department of Neurology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
| | - M. Xu
- Department of Neurology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
| | - G. Zhong
- Department of Neurology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
| | | | - M. Lou
- Department of Neurology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
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Abstract
The Diels-Alder reaction is a quintessential type of [4+2] cycloaddition that remains one of the most intriguing transformations in synthetic chemistry. This reaction has long been envisaged to participate in the biosynthesis of a number of cyclohexene-containing natural products, although the question of whether a bona fide Diels-Alderase exists remains unsolved. In nature, there are remarkably few enzymes known to have the activity of [4+2] cycloaddition. These enzymes are phylogenetically distinct and are often classified according to the specific chemical structures. The variation of protein ancestors and in many cases the instability/complexity of the substrates and products pose a significant challenge in identification of the [4+2] cycloaddition catalysts using general homology-based mining approaches. We here provide the detailed description of the multiple comparison-based strategy and methods for the characterization of two distinct types of dedicated [4+2] cyclases (eg, PyrE3 and PyrI4) in the biosynthesis of spirotetramates and spirotetronates, where they act in tandem for coordinated cross-bridging of a linear polyene intermediate into a enantiomerically pure pentacyclic core. The search of new protein scaffolds with the [4+2] cycloaddition activity could enrich the pool of the candidates for mechanistic examination of a true enzymatic Diels-Alder reaction. The protocols presented in this study would also be applicable to the study of other functionally similar but phylogenetically different proteins, eg, the spiroketal cyclases.
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Affiliation(s)
- B Pang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, PR China
| | - G Zhong
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, PR China
| | - Z Tang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, PR China
| | - W Liu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, PR China; Huzhou Center of Bio-Synthetic Innovation, Huzhou, PR China.
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25
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Zhao Z, Chen J, Peng W, Wang X, Chen Z, Tang H, Liang Y, Ma Z, Chen J, Chen X, Zhong G, Huang M. Single- and Multiple-dose Pharmacokinetic, Safety and Tolerability Study of Mildronate Injection in Healthy Chinese Subjects Pharmacokinetic of Mildronate Injection. Drug Res (Stuttg) 2015; 66:251-6. [PMID: 26697890 DOI: 10.1055/s-0035-1569297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Mildronate is an agent for cardioprotection and neuroprotection. This study aimed to evaluate the pharmacokinetic (PK) profiles, safety and tolerability of mildronate injection after single escalating doses and multiple doses in healthy Chinese subjects. We performed a randomized, open-label, single- and multiple-dose phase I trial including 3 doses of mildronate: 250, 500 and 750 mg. Plasma and urine samples were collected and concentrations of mildronate were analyzed by liquid chromatography-mass spectrometry (LC-MS/MS). PK parameters were calculated using noncompartmental analysis. Safety and tolerability was assessed throughout noting subjects' vital signs and monitoring adverse events (AEs) and conduct a comprehensive physical examination and laboratory analyses before and after the study. There was no significant difference in C 0, AUC0-t, AUC0-∞ among 3 single-dose groups, whereas T 1/2 had significant statistical difference which may be caused by the inhibition of metabolic enzymes. Single- and multiple-dose intravenous injection of mildronate exhibited linear PK profiles in the range of 250-750 mg. An unconspicuous accumulation phenomenon was found after multiple-dose mildronate administration. No significant gender difference was found and mildronate is primarily excreted by the kidney. No serious AEs were observed. The formulation was safe and well tolerated from 250 to 750 mg.
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Affiliation(s)
- Z Zhao
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, North Campus, Sun Yat-*Sen University, Yuexiu District, Guang Zhou, China
| | - J Chen
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, North Campus, Sun Yat-*Sen University, Yuexiu District, Guang Zhou, China
| | - W Peng
- Department of Pharmacy, the Second Xiangya Hospital, Central South University, Chang Sha, China
| | - X Wang
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, North Campus, Sun Yat-*Sen University, Yuexiu District, Guang Zhou, China
| | - Z Chen
- The First Affiliated Hospital, Sun Yat-Sen University, Guang Zhou, China
| | - H Tang
- The First Affiliated Hospital, Sun Yat-Sen University, Guang Zhou, China
| | - Y Liang
- The First Affiliated Hospital, Sun Yat-Sen University, Guang Zhou, China
| | - Z Ma
- The First Affiliated Hospital, Sun Yat-Sen University, Guang Zhou, China
| | - J Chen
- The First Affiliated Hospital, Sun Yat-Sen University, Guang Zhou, China
| | - X Chen
- The First Affiliated Hospital, Sun Yat-Sen University, Guang Zhou, China
| | - G Zhong
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, North Campus, Sun Yat-*Sen University, Yuexiu District, Guang Zhou, China
| | - M Huang
- Laboratory of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, North Campus, Sun Yat-*Sen University, Yuexiu District, Guang Zhou, China
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Zhong G, Li H, Shan T, Zhang N. Genetic variability of DNA repair mechanisms in chemotherapy treatment outcome of gastric cancer patients. Genet Mol Res 2015; 14:17228-34. [DOI: 10.4238/2015.december.16.22] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Campbell J, Huang Y, Liu Y, Schenken R, Zhong G. Luciferase imaging of chylamdia muridarum ascending infection in mice. Fertil Steril 2014. [DOI: 10.1016/j.fertnstert.2014.07.959] [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: 10/24/2022]
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28
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Hu W, Xie W, Chen S, Zhang N, Zou Y, Dong X, Rashid M, Xiao Y, Hu M, Zhong G. Separation of Cis- and Trans-Cypermethrin by Reversed-Phase High-Performance Liquid Chromatography. J Chromatogr Sci 2014; 53:612-8. [DOI: 10.1093/chromsci/bmu094] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Xie R, Zhang C, van der Veen MH, Arstila K, Hantschel T, Chen B, Zhong G, Robertson J. Carbon nanotube growth for through silicon via application. Nanotechnology 2013; 24:125603. [PMID: 23466644 DOI: 10.1088/0957-4484/24/12/125603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Through silicon via (TSV) technology is key for next generation three-dimensional integrated circuits, and carbon nanotubes (CNT) provide a promising alternative to metal for filling the TSV. Three catalyst preparation methods for achieving CNT growth from the bottom of the TSV are investigated. Compared with sputtering and evaporation, catalyst deposition using dip-coating in a FeCl2 solution is found to be a more efficient method for realizing a bottom-up filling of the TSV (aspect ratio 5 or 10) with CNT. The CNT bundles grown in 5 min exceed the 50 μm length of the TSV and are multi-wall CNT with three to eight walls. The CNT bundles inside the TSV were electrically characterized by creating a direct contact using a four-point nanoprober setup. A low resistance of the CNT bundle of 69.7 Ω (297 Ω) was measured when the CNT bundle was contacted midway along (over the full length of) the 25 μm deep TSV. The electrical characterization in combination with the good filling of the TSV demonstrates the potential use of CNT in fully integrated TSV applications.
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Affiliation(s)
- R Xie
- Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
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Jin J, Liu J, Chen J, Zhao L, Ma Z, Chen X, Huang M, Zhong G. Bioequivalence evaluation of 2 tablet formulations of entecavir in healthy chinese volunteers: a single-dose, randomized-sequence, open-label crossover study. Arzneimittelforschung 2012; 62:113-6. [PMID: 22282264 DOI: 10.1055/s-0031-1297964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
A randomized, 2-way crossover study was conducted in healthy Chinese male volunteers to evaluate the bioequivalence of a new generic formulation of entecavir (CAS 142217-69-4) tablets (test) and the available branded formulation (reference) to meet the requirements for marketing the test product in China. Test and reference tablets were administered as a single dose on 2 treatment days separated by a 2-week washout period. Blood samples were collected for a period of 24 h following drug administration. Plasma concentration of entecavir was determined by a liquid chromatography-tandem mass spectrometry (LC/MS/MS) method. Pharmacokinetic parameters were calculated using a noncompartmental model. Bioequivalence was determined by calculating 90% CIs for the ratios of Cmax, AUC0-t and AUC0-∞ values for the test and reference products. Tolerability was assessed by monitoring vital signs, laboratory tests and interviews with the volunteers before administration and every 2 h during the study. The 90% CIs of entecavir for Cmax, AUC0-t and AUC0-∞ were 95.2-106.9%, 98.4-104.6% and 97.3-104.4%, respectively, which fell within the interval of 80-125%. No clinically important adverse effects were reported. These results suggested that the test formulation of entecavir tablets met the regulatory criterion for bioequivalence to the reference formulation.
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Affiliation(s)
- J Jin
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
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Chen P, Song J, Luo LH, Zhong G, Xiao HJ, Gong SS. Abnormal motor reflexes and dormant facial motor neurons in rats with facial-facial anastomosis. J Int Med Res 2009; 37:705-16. [PMID: 19589254 DOI: 10.1177/147323000903700314] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
After facial nerve injury, some post-paralysis sequelae, such as synkinesis, hemispasm and 'crocodile tears' syndrome appear. The psychosocial impact of these sequelae is unavoidable. Despite recent advances and the growing popularity of this field, the pathophysiological mechanisms of facial nerve injury and regeneration are still not well understood. In this report, an abnormal motor reflex coincident with synkinetic facial movement was examined in a rat model using the blink reflex technique. Some dormant facial motor neurons were found which could not innervate through the suture site but remained alive. These results suggest that such dormant neurons might exert roles distinct from those of re-innervated neurons during facial nerve injury and regeneration. Further study is required to elucidate the biomolecular structure and electrophysiological features of such neurons.
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Affiliation(s)
- P Chen
- Department of Otorhinolaryngology, Head and Neck Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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Lu M, Zhu D, Lu Y, Hou Y, Tan B, Zhong G. Organocatalytic asymmetric alpha-aminoxylation/aza-Michael reactions for the synthesis of functionalized tetrahydro-1,2-oxazines. Angew Chem Int Ed Engl 2008; 47:10013. [PMID: 19072787 DOI: 10.1002/anie.200890274] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Robertson J, Hofmann S, Cantoro M, Parvez A, Ducati C, Zhong G, Sharma R, Mattevi C. Controlling the catalyst during carbon nanotube growth. J Nanosci Nanotechnol 2008; 8:6105-6111. [PMID: 19198352 DOI: 10.1166/jnn.2008.sw08] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have recently been able to grow single-walled carbon nanotubes by purely thermal chemical vapour deposition (CVD) at temperatures as low as 400 degrees C. This has been achieved by separating the catalyst pre-treatment step from the growth step. In the pre-treatment step, a thin film catalyst is re-arranged into a series of nano-droplets, which are then the active catalysts. Both steps have been studied by in-situ environmental transmission electron microscopy and X-ray photoemission spectroscopy. We have also studied the catalyst yield, the weight of nanotubes grown per weight of transition metal catalyst. Using very thin layers of Fe on Al2O3 support in a remote plasma-assisted CVD, we have achieved yields of order 100,000. This may be due to control of catalyst poisoning by ensuring an etching path.
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Affiliation(s)
- J Robertson
- Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
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Mizukami M, Zhong G, Fukuchi I, Zhang L, Kurihara K. In situpolymerization of molecular macroclusters on silica: poly( N-isopropylacrylamide) nano-films. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308081981] [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: 11/11/2022] Open
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Dong X, Fan Y, Zhong G, Long J, Xiu K, Wang B, Zhang M. Osseointegration of titatinum implant for the transfermoral prosthesis—Animal study. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)84903-1] [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: 12/01/2022]
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36
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Zhong G, Wang J, Xu M, Xie Z, Yu M, Wang J, Zhou T, Gong W, Sun Y, Hu M, Zhang X, Shen B, Guo N. Enhanced Maturation and Functional Capacity of Dendritic Cells Induced by Mannosylated L2 Domain of ErbB2 Receptor. Scand J Immunol 2005; 62:108-16. [PMID: 16101816 DOI: 10.1111/j.1365-3083.2005.01642.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The nature of antigens and functional state of dendritic cells (DC) are important in antigen presentation. The ability of DC for the induction of T-cell responses is promoted by maturation. It has been confirmed that mannose receptors mediate highly efficient endocytosis and presentation of mannosylated proteins. In the present study, L2 domain of ErbB2 ectodomain was expressed in Escherichia coli, purified and mannosylated. The maturation and functional capacity of DC induced by mannosylated L2 (mL2) protein were investigated. The results showed that L2 protein could induce DC maturation, which was accompanied by elevated expression of MHC and co-stimulatory molecules. The effect of mL2 protein on DC maturation was more remarkable than that of non-mL2 proteins. Uptake of mL2 antigens by DC was more efficient. Furthermore, the T cells can be stimulated to proliferate in vitro and secrete Th1 and Th2 cytokines. Higher levels of both IFN-gamma and IL-10 were detected from the T cells stimulated by mL2-pulsed DC, suggesting a concurrent activation of CD4+ and CD8+ T cells. The results demonstrated that L2 domain of ErbB2 receptor is an immunodominant molecule. The mL2 domain of ErbB2 can induce an enhanced maturation and functional capacity of DC. It may become an effective strategy to induce anti-ErbB2 response.
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Affiliation(s)
- G Zhong
- Institute of Basic Medical Sciences, Beijing, China
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37
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Abstract
We assessed the expression of estrogen receptors (ER)alpha and ERbeta in 114 human endometrial hyperplasia and adenocarcinomas. The aim of this study was to determine the expression of both ER isoforms in human endometrial tissue by immunohistochemistry. From normal proliferation to simple and complex hyperplasia, the expression of ERalpha was increased (P < 0.05), while ERbeta did not change much (P > 0.05). In atypia hyperplasia and adenocarcinoma, both ERalpha and ERbeta were decreased significantly (P < 0.05). Most endometrial adenocarcinomas expressed ERalpha, either alone or in combination with ERbeta, and the ERbeta/ERalpha ratio was decreased when compared to normal proliferation (P < 0.05). Also, we found that the expression of ERalpha and ERbeta has no relationship with the status of lymph node of adenocarcinoma (P > 0.05). Both ERalpha and ERbeta play an important role in endometrial hyperplasia and carcinomas, the levels of ERalpha and ERbeta appear be used as prognostic indicators.
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Affiliation(s)
- K Hu
- Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
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Hu K, Zhong G, He F. Expression of estrogen receptors ERα and ERβ in endometrial hyperplasia and adenocarcinoma. Int J Gynecol Cancer 2005. [DOI: 10.1136/ijgc-00009577-200505000-00020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
We assessed the expression of estrogen receptors (ER)α and ERβ in 114 human endometrial hyperplasia and adenocarcinomas. The aim of this study was to determine the expression of both ER isoforms in human endometrial tissue by immunohistochemistry. From normal proliferation to simple and complex hyperplasia, the expression of ERα was increased (P < 0.05), while ERβ did not change much (P > 0.05). In atypia hyperplasia and adenocarcinoma, both ERα and ERβ were decreased significantly (P < 0.05). Most endometrial adenocarcinomas expressed ERα, either alone or in combination with ERβ, and the ERβ/ERα ratio was decreased when compared to normal proliferation (P < 0.05). Also, we found that the expression of ERα and ERβ has no relationship with the status of lymph node of adenocarcinoma (P > 0.05). Both ERα and ERβ play an important role in endometrial hyperplasia and carcinomas, the levels of ERα and ERβ appear be used as prognostic indicators.
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Zhong G, Tachiki M, Umezawa H, Fujisaki T, Kawarada H, Ohdomari I. Large-Area Synthesis of Carbon Nanofibers by Low-Power Microwave Plasma-Assisted CVD. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/cvde.200304168] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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40
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Prifti S, Lelle I, Zhong G, Strowitzki T, Rabe T. Matrix metalloproteinase 2 and tissue inhibitor of metalloproteinase 2 expression is not regulated by norgestimate or norelgestromin. Gynecol Endocrinol 2004; 18:23-7. [PMID: 15106361 DOI: 10.1080/09513590310001651740] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [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: 12/30/2022] Open
Abstract
Steroid hormones regulate endometrial expression of matrix metalloproteinases (MMPs) and their inhibitors. Synthetic progestins are widely used in oral contraceptives and for hormone replacement therapy. To assess whether the synthetic progestins norgestimate and its derivative norelgestromin (17-deacetylnorgestimate) modulate the expression of MMPs, Ishikawa endometrial cancer cells were separately treated with 17 beta-estradiol, 17 alpha-hydroxyprogesterone, norgestimate and norelgestromin. Culture supernatants were assayed for MMPs 2, 3 and 9, and for tissue inhibitors of MMPs (TIMP-1 and TIMP-2) by enzyme-linked immunosorbent assays (ELISAs). No marked modulation of MMP-2 and TIMP-2 expression was observed upon incubation of the cells with the synthetic progestins. By ELISA, neither MMP-3 or MMP-9 nor TIMP-1 immunoreactivity was detected. Interestingly, TIMP-2 expression was down-regulated by 17 beta-estradiol and 17 alpha-hydroxyprogesterone.
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Affiliation(s)
- S Prifti
- Department of Gynecological Endocrinology and Reproductive Medicine, Women's Hospital, University of Heidelberg. Voss-str. 9, D-69115 Heidelberg, Germany
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41
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Zhong G, Mantel PL, Jiang X, Jarry-Guichard T, Gros D, Labarrere C, Moreno AP. LacSwitch II regulation of connexin43 cDNA expression enables gap-junction single-channel analysis. Biotechniques 2003; 34:1034-9, 1041-4, 1046. [PMID: 12765030 DOI: 10.2144/03345rr03] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 11/23/2022] Open
Abstract
Metabolic and electrical coupling through gap junction channels is implicated in cell differentiation, tissue homeostasis, and electrotonic propagation of signals in excitable tissues. The characterization of gating properties of these channels requires electrophysiological recordings at both single- and multiple-channel levels. Hence, a system that is able to control connexin expression by external means would provide a useful tool. To regulate the expression of connexins in cells, plasmids encoding a transactivator and/or a lac-operon IPTG response-dependent Cx43 target gene were transfected into communication-deficient N2a neuroblastoma cells. Immunoblotting, dye coupling, and electrophysiological methods revealed that expression of Cx43 in selected clones could be tightly regulated. After 15-20 h of acute induction with IPTG, cell-to-cell communication reached its peak with junctional conductances of 15-30 nS. Chronic induction at specific doses of IPTG produced constant, controlled levels of Cx43 expression, which were reflected by predictable junctional coupling levels. These conditions allowed prolonged recordings from either lowly or highly coupled cells, making lac operon an ideal regulatory system for channel gating studies at a single-channel level.
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Affiliation(s)
- G Zhong
- Indiana University School of Medicine, Indianapolis, IN, USA
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42
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Wan F, Zhong G, Liu L. [A textual research on drinking disease and antidrinking remedies]. Zhonghua Yi Shi Za Zhi 2001; 24:203-6. [PMID: 11613253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
This subject is investigated through three aspects, viz., definition of drinking disease, its manifestations and treatment, and recipes and drug for antidrinking. The term "drinking disease" (Jiu Bing) was first recorded in Wang Shuhe's Canon of Pulsology, while abnormal drinking (Jiu Bo) was mentioned in Miraculous Pivot (Ling Shu). On Pathogenesis Manifestation of all diseases (Zhu Bing Yuan Hou Lun) gives the pathology and etiology. Great influence was exerted from Jin-yuan dynasties concerning its treatment. Zhang Jiebin expounded the comatous syndrome due to drinking (Jiu Jue). The earliest antidrinking drug was recorded in Shen Nong's Classic of Herbology. Through investigation, the commonly applied drug for relieving drunk include Flos Puerariae, Fructus Hovenariae, while the famous recipe for relieving drunk is Anti-tipsy Decoction of Flos Puerariae.
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Wolf K, Fischer E, Mead D, Zhong G, Peeling R, Whitmire B, Caldwell HD. Chlamydia pneumoniae major outer membrane protein is a surface-exposed antigen that elicits antibodies primarily directed against conformation-dependent determinants. Infect Immun 2001; 69:3082-91. [PMID: 11292727 PMCID: PMC98263 DOI: 10.1128/iai.69.5.3082-3091.2001] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [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: 11/20/2022] Open
Abstract
The major outer membrane protein (MOMP) of Chlamydia trachomatis serovariants is known to be an immunodominant surface antigen. Moreover, it is known that the C. trachomatis MOMP elicits antibodies that recognize both linear and conformational antigenic determinants. In contrast, it has been reported that the MOMP of Chlamydia pneumoniae is not surface exposed and is immunorecessive. We hypothesized that the discrepancies between C. trachomatis and C. pneumoniae MOMP exposure on intact chlamydiae and immunogenic properties might be because the focus of the host's immune response is directed to conformational epitopes of the C. pneumoniae MOMP. We therefore conducted studies aimed at defining the surface exposure of MOMP and the conformational dominance of MOMP antibodies. We present here a description of C. pneumoniae species-specific monoclonal antibody (MAb), GZD1E8, which recognizes a conformational epitope on the surface of C. pneumoniae. This MAb is potent in the neutralization of C. pneumoniae infectivity in vitro. Another previously described C. pneumoniae species-specific monoclonal antibody, RR-402, displayed very similar characteristics. However, the antigenic determinant recognized by RR-402 has yet to be identified. We show by immunoprecipitation of C. pneumoniae with GZD1E8 and RR-402 MAbs and by mass spectrometry analysis of immunoprecipitated proteins that both antibodies GZD1E8 and RR-402 recognize the MOMP of C. pneumoniae and that this protein is localized on the surface of the organism. We also show that human sera from C. pneumoniae-positive donors consistently recognize the MOMP by immunoprecipitation, indicating that the MOMP of C. pneumoniae is an immunogenic protein. These findings have potential implications for both C. pneumoniae vaccine and diagnostic assay development.
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Affiliation(s)
- K Wolf
- Laboratory of Intracellular Parasites, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Rocky Mountain Laboratory, Hamilton, Montana 59840, USA.
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Abstract
Microbial pathogens have been selected for the capacity to evade or manipulate host responses in order to survive after infection. Chlamydia, an obligate intracellular pathogen and the causative agent for many human diseases, can escape T lymphocyte immune recognition by degrading host transcription factors required for major histocompatibility complex (MHC) antigen expression. We have now identified a chlamydial protease- or proteasome-like activity factor (CPAF) that is secreted into the host cell cytosol and that is both necessary and sufficient for the degradation of host transcription factors RFX5 and upstream stimulation factor 1 (USF-1). The CPAF gene is highly conserved among chlamydial strains, but has no significant overall homology with other known genes. Thus, CPAF represents a unique secreted protein produced by an obligate intracellular bacterial pathogen to interfere with effective host adaptive immunity.
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Affiliation(s)
- G Zhong
- Department of Microbiology, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229, USA.
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Liu L, Hu H, Ji H, Murdin AD, Pierce GN, Zhong G. Chlamydia pneumoniae infection significantly exacerbates aortic atherosclerosis in an LDLR-/- mouse model within six months. Mol Cell Biochem 2000; 215:123-8. [PMID: 11204447 DOI: 10.1023/a:1026531506202] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [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: 01/01/2023]
Abstract
We have previously shown that infection with the C. pneumoniae AR39 strain once monthly for 9 consecutive months significantly exacerbated atherosclerosis in mice with LDL receptor deficiency (LDLR-/-) in the presence of a high cholesterol diet. To further optimize the LDLR-/- mouse model for studying the mechanisms of C. pneumoniae atherogenesis, we have tested a different infection protocol with intranasal inoculation twice monthly for 6 consecutive months in the present study. We found that C. pneumoniae infection for 6 months was sufficient to produce a 130%, significantly greater exacerbation of aortic atherosclerosis in LDLR-/- mice in the presence of a high cholesterol diet. Mice receiving a high cholesterol diet alone displayed a lesion area index of 18.2 +/- 6.1 (S.D.) while mice treated with both the high cholesterol diet and C. pneumoniae infection had a lesion area index of 41.8 +/- 15.2 (S.D.). However, the chlamydial infection did not significantly alter the mouse serum total cholesterol or the LDL levels induced by the high cholesterol diet. This study not only confirms our previous findings that C. pneumoniae infection can exacerbate aortic atherosclerosis lesion in the LDLR-/- mice, but also further optimizes the LDLR-/- mouse model for future mechanism studies.
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Affiliation(s)
- L Liu
- Department of Medical Microbiology, St. Bonilace General Hospital Research Centre, University of Manitoba, Canada
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46
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Kobor MS, Simon LD, Omichinski J, Zhong G, Archambault J, Greenblatt J. A motif shared by TFIIF and TFIIB mediates their interaction with the RNA polymerase II carboxy-terminal domain phosphatase Fcp1p in Saccharomyces cerevisiae. Mol Cell Biol 2000; 20:7438-49. [PMID: 11003641 PMCID: PMC86297 DOI: 10.1128/mcb.20.20.7438-7449.2000] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [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: 11/20/2022] Open
Abstract
Transcription by RNA polymerase II is accompanied by cyclic phosphorylation and dephosphorylation of the carboxy-terminal heptapeptide repeat domain (CTD) of its largest subunit. We have used deletion and point mutations in Fcp1p, a TFIIF-interacting CTD phosphatase, to show that the integrity of its BRCT domain, like that of its catalytic domain, is important for cell viability, mRNA synthesis, and CTD dephosphorylation in vivo. Although regions of Fcp1p carboxy terminal to its BRCT domain and at its amino terminus were not essential for viability, deletion of either of these regions affected the phosphorylation state of the CTD. Two portions of this carboxy-terminal region of Fcp1p bound directly to the first cyclin-like repeat in the core domain of the general transcription factor TFIIB, as well as to the RAP74 subunit of TFIIF. These regulatory interactions with Fcp1p involved closely related amino acid sequence motifs in TFIIB and RAP74. Mutating the Fcp1p-binding motif KEFGK in the RAP74 (Tfg1p) subunit of TFIIF to EEFGE led to both synthetic phenotypes in certain fcp1 tfg1 double mutants and a reduced ability of Fcp1p to activate transcription when it is artificially tethered to a promoter. These results suggest strongly that this KEFGK motif in RAP74 mediates its interaction with Fcp1p in vivo.
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Affiliation(s)
- M S Kobor
- Banting and Best Department of Medical Research, University of Toronto, Toronto, Ontario M5G 1L6, Canada
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47
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Fong IW, Quinn T, Blessing E, Kuo C, Malinverni R, Lauer M, Mawhorter S, Bachmaier K, Rosenfeld M, Taylor C, Zhong G. Collaborative multidisciplinary workshop report: what questions regarding the role of Chlamydia pneumoniae in atherosclerosis and cardiovascular disease need to be addressed utilizing animal models? J Infect Dis 2000; 181 Suppl 3:S519-20. [PMID: 10839751 DOI: 10.1086/315637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- I W Fong
- St. Michael's Hospital, Toronto, Ontario, M5B 1W8 Canada. fongi@smh. toronto.on.ca
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48
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Zhong G, Ma Q, Shao Z. [Inner-hemangioma ligation and pingyangmycin injection in hemangioma (with 30 cases report)]. Zhonghua Zheng Xing Wai Ke Za Zhi 2000; 16:133-5. [PMID: 11593684] [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: 02/21/2023]
Abstract
OBJECTIVE To provide a simple and safe surgical approach in treating cavernous and racemose hemangioma. METHODS First cross-ligate the hemangioma, as to divide the tumor into independent compartments, them inject pingyangmycin into the compartments respectively. RESULTS There are 30 cases in this group (35 hemangiomas). Twenty-four cases (28 hemangiomas) were totally cured, accounting for 80%; Six cases were improved (7 hemangiomas) for 20%; There was no ineffective case. CONCLUSION "Inner-hemangioma ligation and injection of pingyangmycin" has broad surgical indications, with desirable outcome in treating cavernous and racemose hemangioma, especially those unsuitable for surgery, or ineffective simply by inner-hemangioma injection.
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Affiliation(s)
- G Zhong
- Department of Plastic Surgery, 2nd Hospital, Medical College, Zhejiang University, Zhejiang Medical University, Hangzhou 310009, PR China
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49
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Zhong G, Liu L, Fan T, Fan P, Ji H. Degradation of transcription factor RFX5 during the inhibition of both constitutive and interferon gamma-inducible major histocompatibility complex class I expression in chlamydia-infected cells. J Exp Med 2000; 191:1525-34. [PMID: 10790427 PMCID: PMC2213440 DOI: 10.1084/jem.191.9.1525] [Citation(s) in RCA: 160] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
We have previously shown that the obligate intracellular pathogen chlamydia can suppress interferon (IFN)-gamma-inducible major histocompatibility complex (MHC) class II expression in infected cells by degrading upstream stimulation factor (USF)-1. We now report that chlamydia can also inhibit both constitutive and IFN-gamma-inducible MHC class I expression in the infected cells. The inhibition of MHC class I molecule expression correlates well with degradation of RFX5, an essential downstream transcription factor required for both the constitutive and IFN-gamma-inducible MHC class I expression. We further demonstrate that a lactacystin-sensitive proteasome-like activity identified in chlamydia-infected cell cytosolic fraction can degrade both USF-1 and RFX5. This proteasome-like activity is dependent on chlamydial but not host protein synthesis. Host preexisting proteasomes may not be required for the unique proteasome-like activity. These observations suggest that chlamydia-secreted factors may directly participate in the proteasome-like activity. Efforts to identify the chlamydial factors are underway. These findings provide novel information on the molecular mechanisms of chlamydial evasion of host immune recognition.
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Affiliation(s)
- G Zhong
- Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba R3E OW3, Canada.
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50
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Karlstrom A, Zhong G, Rader C, Larsen NA, Heine A, Fuller R, List B, Tanaka F, Wilson IA, Barbas CF, Lerner RA. Using antibody catalysis to study the outcome of multiple evolutionary trials of a chemical task. Proc Natl Acad Sci U S A 2000; 97:3878-83. [PMID: 10760259 PMCID: PMC18110 DOI: 10.1073/pnas.97.8.3878] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [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: 11/18/2022] Open
Abstract
Catalytic aldolase antibodies generated by immunization with two different, but structurally related, beta-diketone haptens were cloned and sequenced to study similarities and differences between independently evolved catalysts. Kinetic and sequence analysis coupled with mutagenesis, structural, and modeling studies reveal that the defining event in the evolution of these catalysts was a somatic mutation that placed a lysine residue in a deep, yet otherwise unrefined, hydrophobic pocket. We suggest that covalent chemistries may be as readily selected from the immune repertoire as the traditional noncovalent interactions that have formed the basis of immunochemistry until this time. Further, we believe that these experiments recapitulate the defining events in the evolution of nature's enzymes, particularly as they relate to chemical mechanism, catalytic promiscuity, and gene duplication.
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Affiliation(s)
- A Karlstrom
- The Skaggs Institute for Chemical Biology and the Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
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