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Sheng P, Yang M, Shi ZN, Yang JZ, Zhang ZM, Yang X, Xin W, Zhu MS, Mei XL, Chen YS. Characteristics of fish community structure and environmental driving factors in Taihu Lake during the first year of fishing ban. Ying Yong Sheng Tai Xue Bao 2023; 34:2555-2565. [PMID: 37899123 DOI: 10.13287/j.1001-9332.202309.030] [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: 10/31/2023]
Abstract
Taihu Lake has officially implemented the full fishing ban policy since October 1, 2020. We investigated fish community of Taihu Lake in the four seasons of 2020. A total of 42 fish species were collected, belonging to 6 orders, 7 families, and 33 genera. The first five dominant species ranked by the index of relative importance were Coilia nasus, Toxabramis swinhonis, Hypophthalmichthys molitrix, Hypophthalmichthys nobilis, and Salangichthys tangkahkeii. The number of C. nasus accounted for 85.1% of the total number of catches. According to the distributional characteristics of cyanobacterial blooms and aquatic plants, Taihu Lake could be divided into the northern, central, and eastern regions. There was no significant difference in catch per unit effort (CPUE) among different lake regions, but Shannon diversity index and Pielou evenness index in the eastern region was greater than in the other two regions. The CPUE, Shannon diversity index, and Pielou evenness index were significantly different among the four seasons, with the lowest CPUE in autumn and higher diversity in autumn and winter than in spring and summer. Electrical conductivity, water depth, chloride, and transparency were the main environmental factors driving the seasonal variations of fish community in Taihu Lake, while electrical conductivity, dissolved oxygen, total alkalinity, and transparency were key variables driving the spatial patterns. The results could be used as the baseline data for fish community studies in Taihu Lake after the fishing ban.
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Affiliation(s)
- Piao Sheng
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Min Yang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Ning Shi
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jian-Zhong Yang
- Office of Taihu Fishery Management Committee, Suzhou 215104, Jiangsu, China
| | - Zhi-Min Zhang
- Fisheries Technology Extension Center of Jiangsu Province, Nanjing 210036, China
| | - Xu Yang
- College of Life Sciences, Jiangxi Normal University, Nanchang 330022, China
| | - Wei Xin
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Ming-Sheng Zhu
- Office of Taihu Fishery Management Committee, Suzhou 215104, Jiangsu, China
| | - Xiao-le Mei
- Fisheries Technology Extension Center of Jiangsu Province, Nanjing 210036, China
| | - Yu-Shun Chen
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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Zhao X, Gu M, Xu X, Wen X, Yang G, Li L, Sheng P, Meng F. CCL3/CCR1 mediates CD14 +CD16 - circulating monocyte recruitment in knee osteoarthritis progression. Osteoarthritis Cartilage 2020; 28:613-625. [PMID: 32006659 DOI: 10.1016/j.joca.2020.01.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 12/23/2019] [Accepted: 01/10/2020] [Indexed: 02/02/2023]
Abstract
OBJECTIVES Monocyte-derived macrophages, as the predominant immune cell type that is increased in inflamed synovium, play a vital role during knee osteoarthritis (KOA) progression. However, the mechanisms underlying the recruitment of circulating monocytes to osteoarthritic knees remain uncertain. Based on previous data obtained from plasma, we investigated the contributions of CCL2, CCL3, CCL4 and their cognate receptors in circulating monocyte chemotaxis and KOA development. METHODS Using flow cytometry staining, we characterized the expression patterns of the chemokine receptors in CD14+CD16- circulating monocytes from KOA patients and healthy volunteers. The expression of chemokines in synovial fluids, synovium and cartilage was investigated in KOA patients and in patients without KOA. The role of chemokines and their cognate receptors in the chemotaxis of CD14+CD16- circulating monocytes was assessed using chemokine neutralizing antibodies (NA) and receptor antagonists in vitro and in vivo. RESULTS The majority of CD14+CD16- circulating monocytes were CCR1-and CCR2-positive. CCL2, CCL3 and CCL4 were elevated in synovial fluid of KOA patients compared with that of controls. The most likely source of these chemokines is inflamed synovium and cartilage in the osteoarthritic knee. The CCL3/CCR1 and CCL2/CCR2 axes showed substantial ability to recruit CD14+CD16- monocytes in transwell assays. Similar results were confirmed in a mouse model of collagenase-induced KOA (CIA) in which blocking either the CCL3/CCR1 axis or the CCL2/CCR2 axis reduced synovial hyperplasia and F4/80+ macrophage infiltration. CONCLUSIONS Our findings suggested that, analogous to the CCL2/CCR2 axis, CCL3 produced in osteoarthritic knees can chemoattract circulating monocytes to the inflamed synovium through CCR1.
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Affiliation(s)
- X Zhao
- Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, PR China.
| | - M Gu
- Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, PR China
| | - X Xu
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - X Wen
- Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, PR China
| | - G Yang
- Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, PR China
| | - L Li
- Department of Obstetrics and Gynecology, Fetal Medicine Center, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, PR China
| | - P Sheng
- Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, PR China
| | - F Meng
- Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, PR China.
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Chen QH, Lu JM, Liang L, Zheliuk O, Ali A, Sheng P, Ye JT. Inducing and Manipulating Heteroelectronic States in a Single MoS_{2} Thin Flake. Phys Rev Lett 2017; 119:147002. [PMID: 29053311 DOI: 10.1103/physrevlett.119.147002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Indexed: 06/07/2023]
Abstract
By dual gating a few-layer MoS_{2} flake, we induce spatially separated electronic states showing superconductivity and Shubnikov-de Haas (SdH) oscillations. While the highly confined superconductivity forms at the K/K^{'} valleys of the topmost layer, the SdH oscillations are contributed by the electrons residing in the Q/Q^{'} valleys of the rest of the bottom layers, which is confirmed by the extracted Landau level degeneracy of 3, electron effective mass of 0.6m_{e}, and carrier density of 5×10^{12} cm^{-2}. Mimicking conventional heterostructures, the interaction between the heteroelectronic states can be electrically manipulated, which enables "bipolarlike" superconducting transistor operation. The off-on-off switching pattern can be continuously accessed at low temperatures by a field effect depletion of carriers with a negative back gate bias and the proximity effect between the top superconducting layer and the bottom metallic layers that quenches the superconductivity at a positive back gate bias.
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Affiliation(s)
- Q H Chen
- Device Physics of Complex Materials, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, Netherlands
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - J M Lu
- Device Physics of Complex Materials, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, Netherlands
| | - L Liang
- Device Physics of Complex Materials, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, Netherlands
| | - O Zheliuk
- Device Physics of Complex Materials, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, Netherlands
| | - A Ali
- Device Physics of Complex Materials, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, Netherlands
| | - P Sheng
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - J T Ye
- Device Physics of Complex Materials, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, Netherlands
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Sheng P, Ribeiro GO, Wang Y, McAllister TA. 613 Humic substances supplementation reduces ruminal methane production and increases the efficiency of microbial protein synthesis in vitro. J Anim Sci 2017. [DOI: 10.2527/asasann.2017.613] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Yang PP, Peng J, Wu YY, Liu Z, Sheng P, Zhou Y, Li SJ, Fan YM. Immunohistochemical evaluation of epidermal proliferation, differentiation and melanocytic density in symmetrical acrokeratoderma. Clin Exp Dermatol 2017; 42:509-515. [PMID: 28543665 DOI: 10.1111/ced.13118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/16/2016] [Indexed: 12/11/2022]
Abstract
BACKGROUND Symmetrical acrokeratoderma (SAK) is characterized by brown to black hyperkeratotic patches on acral regions. Although epidermal hyperkeratosis and acanthosis are consistent pathological changes, the nature of epidermal hyperplasia is unknown. AIM To evaluate epidermal proliferation and differentiation and melanocytic density in skin lesions of SAK. METHODS Expression of keratin 10 (K10), K14, K16, involucrin, filaggrin, Ki-67, and Melan-A was detected by immunohistochemistry in eight patients with SAK, seven patients with ichthyosis vulgaris (IV) and six healthy controls (HCs). RESULTS Expression of K14, K16, involucrin and filaggrin was upregulated in patients with SAK compared with patients with IV and the HCs (P < 0.01-0.05), but K10 expression was similar for the three groups (P > 0.05). Numbers of Ki-67+ and Melan-A+ cells were higher in patients with SAK than in patients with IV and the HCs (P < 0.05). CONCLUSIONS These results demonstrate that excessive keratinocyte proliferation and abnormal differentiation contribute to epidermal hyperplasia, while melanocytic proliferation is responsible for the pigmented lesions in SAK.
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Affiliation(s)
- P-P Yang
- Department of Dermatology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, China
| | - J Peng
- Department of Dermatology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, China
| | - Y-Y Wu
- Department of Dermatology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, China
| | - Z Liu
- Department of Dermatology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, China
| | - P Sheng
- Department of Dermatology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, China
| | - Y Zhou
- Department of Dermatology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, China
| | - S-J Li
- Department of Dermatology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, China
| | - Y-M Fan
- Department of Dermatology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, China
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Wang J, Liu K, Wang H, Li Z, Li Y, Ping S, Bardeesi ASA, Guo Y, Zhou Y, Pei T, Deng L, Sheng P, Liu S, Li C. Role of nifedipine and hydrochlorothiazide in MAPK activation and vascular smooth muscle cell proliferation and apoptosis. Herz 2016; 42:573-584. [DOI: 10.1007/s00059-016-4489-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Revised: 08/28/2016] [Accepted: 09/25/2016] [Indexed: 10/20/2022]
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Zhao XX, Wang Y, Hu CD, Liang LZ, Wang JX, LIU S, Xie YH, Jiang CC, Li YY, Wang JF, Xu YJ, Xie YL, Sheng P. Preliminary Experimental Study of Shine-Through Power for EAST-NBI by Infrared Pyrometer. J Fusion Energ 2015. [DOI: 10.1007/s10894-015-9897-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Xie L, Sheng P, Kong W, Zhao X, Ou-Yang Z, Yang M. Solid-phase extraction using molecularly imprinted polymer for determination of ochratoxin A in human urine. WORLD MYCOTOXIN J 2015. [DOI: 10.3920/wmj2013.1633] [Citation(s) in RCA: 3] [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: 11/19/2022]
Abstract
A rapid, selective and reliable sample preparation technique employing solid-phase extraction (SPE) based on molecularly imprinted polymer (MIP) for the determination of ochratoxin A (OTA) in human urine was described. After sample adjustment to pH 2.5 with 0.1 M HCl, the urine sample was loaded onto the MIP-SPE column, and after a wash step, OTA was eluted for measurement by ultra-high performance liquid chromatography coupled with fluorescence detection. Key parameters which affected the MIP-SPE extraction efficiency were optimized as was the detection method. Under the optimised conditions, the limits of detection and quantification for OTA in urine were 0.2 ng/ml and 0.6 ng/ml, respectively. The recoveries for OTA in urine, spiked at the 0.6, 6.0 and 60 ng/ml levels, ranged from 92.0 to 98.9%. Sixty urine samples were analysed, of which four were found to contain OTA at concentrations ranging from 0.022 to 0.083 ng/ml; the positive results were confirmed by liquid chromatography coupled with tandem mass spectrometry. OTA determination in urine is a good indicator for human exposure to the mycotoxin, and this is the first report on OTA contamination in Chinese people.
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Affiliation(s)
- L. Xie
- Chinese Academy of Medical Sciences, Peking Union Medical College, Institute of Medicinal Plant Development, Malianwa North Road 151, Beijing 100193, China P.R
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, China P.R
| | - P. Sheng
- School of Traditional Chinese Medicine, Xinjiang Medical University, Urumqi 830011, China P.R
| | - W. Kong
- Chinese Academy of Medical Sciences, Peking Union Medical College, Institute of Medicinal Plant Development, Malianwa North Road 151, Beijing 100193, China P.R
| | - X. Zhao
- Chinese Academy of Medical Sciences, Peking Union Medical College, Institute of Medicinal Plant Development, Malianwa North Road 151, Beijing 100193, China P.R
- Chinese Academy of Medicinal Sciences & Peking Union Medical College, Hainan Branch Institute of Medicinal Plant Development, Wanning 571533, China P.R
| | - Z. Ou-Yang
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, China P.R
| | - M. Yang
- Chinese Academy of Medical Sciences, Peking Union Medical College, Institute of Medicinal Plant Development, Malianwa North Road 151, Beijing 100193, China P.R
- Chinese Academy of Medicinal Sciences & Peking Union Medical College, Hainan Branch Institute of Medicinal Plant Development, Wanning 571533, China P.R
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Fu J, Li YY, Lyu B, Sheng P, Zhang Y, Yin XH, Shi YJ, Yu Y, Ye MY, Wan BN. Preparations for the motional Stark effect diagnostic on EAST. Rev Sci Instrum 2014; 85:11D410. [PMID: 25430173 DOI: 10.1063/1.4893996] [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: 06/04/2023]
Abstract
Measurement and control of the current profile is essential for high performance and steady state operation of Experimental Advanced Superconducting Tokamak (EAST). For this purpose, a conventional Motional Stark Effect (MSE) diagnostics utilizing photoelastic modulators is proposed and investigated. The pilot experiment includes one channel to verify the feasibility of MSE, whose sightline intersects with Neutral Beam Injection at major radius of R = 2.12 m. A beam splitter is adopted for simultaneous measurements of Stark multiplets and their polarization directions. A simplified simulation code was also developed to explore the Stark splitting spectra. Finally, the filter is optimized based on the viewing geometry and neutral beam parameters.
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Affiliation(s)
- J Fu
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Y Y Li
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - B Lyu
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - P Sheng
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Y Zhang
- School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - X H Yin
- School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Y J Shi
- School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Y Yu
- School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - M Y Ye
- School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - B N Wan
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
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10
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Dong Y, Sheng P, Tong W, Li Z, Xu D, Hou L. Risk factors associated with sleep disturbance following traumatic brain injury. Sleep Med 2013. [DOI: 10.1016/j.sleep.2013.11.238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Miomandre F, Audebert P, Bonnett JP, Brosseau A, Perriat P, Weisbuch C, Wen W, Sheng P. Silica-polypyrrole core-shell nanocomposites as active materials for dielectrophoretic displays. J Nanosci Nanotechnol 2008; 8:4353-4359. [PMID: 19049025 DOI: 10.1166/jnn.2008.287] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A direct route to silica-polypyrrole core-shell nanoparticles has been used to design new nanocomposites, in which the conducting part is then wrapped by an external silica shell in order to have finally neutral nanoparticles. The nanocomposites are characterized by TEM, spectroscopy, electrochemistry and thermal gravimetric analysis, demonstrating that the external silica shell actually insulates the conjugated polymer from the outer medium. Finally the electrorheological properties of these nanocomposites are checked in a dielectrophoretic device in which the motion of the particles induced by an external electric field can be used to monitor a switch of the light transmission properties.
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Affiliation(s)
- F Miomandre
- Photophysique et Photochimie Supramoléculaires et Macromoléculaires, UMR 8531, PRES UniverSud, Ecole Normale Supérieure de Cachan, 94235 Cachan, France
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Li G, McCarthy M, Sheng P, Kelen G. In-hospital Mortality Risk for Patients Admitted Through Emergency Departments. Acad Emerg Med 2007. [DOI: 10.1197/j.aem.2007.03.1112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Jämsen E, Sheng P, Halonen P, Lehto MU, Moilanen T, Pajamäki J, Puolakka T, Konttinen YT. Spacer prostheses in two-stage revision of infected knee arthroplasty. Int Orthop 2006; 30:257-61. [PMID: 16565839 PMCID: PMC2532134 DOI: 10.1007/s00264-006-0102-2] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2005] [Revised: 12/12/2005] [Accepted: 12/15/2005] [Indexed: 10/24/2022]
Abstract
At present, no consensus exists on the best spacer alternative for the management of two-stage exchange arthroplasty of infected knee arthroplasties. In this retrospective study, patient records of 24 patients, who had undergone two-stage revisions in which resterilised prosthetic components were used as spacers, were reviewed. The outcome was compared to that of operations performed during the same period (1993-2003) using cement spacers (n=10). With an average follow-up of 32 months, control of infection was achieved in 26 cases (76%), with good or excellent clinical outcome in 19 cases (56%). Treatment failed and resulted in amputation at the level of the thigh before reimplantation in one case. Three patients did not undergo reimplantation. In four cases (12%) infection relapsed. The reinfection rate did not differ between the two spacer groups. Patients treated with resterilised components had a superior range of motion during the period between the two stages. Operative time was shorter and there was less blood loss in the reimplantation arthroplasty when a prosthetic spacer was used. We consider resterilised prosthetic components a safe and effective alternative to cement spacers in the management of infected knee arthroplasties.
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Affiliation(s)
- E. Jämsen
- Medical School, University of Tampere, Tampere, Finland
| | - P. Sheng
- Department of Orthopaedics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - P. Halonen
- Coxa, Hospital for Joint Replacement, P.O. Box 652, 33101 Tampere, Finland
| | - M. U.K. Lehto
- Coxa, Hospital for Joint Replacement, P.O. Box 652, 33101 Tampere, Finland
| | - T. Moilanen
- Coxa, Hospital for Joint Replacement, P.O. Box 652, 33101 Tampere, Finland
| | - J. Pajamäki
- Coxa, Hospital for Joint Replacement, P.O. Box 652, 33101 Tampere, Finland
| | - T. Puolakka
- Coxa, Hospital for Joint Replacement, P.O. Box 652, 33101 Tampere, Finland
| | - Y. T. Konttinen
- Coxa, Hospital for Joint Replacement, P.O. Box 652, 33101 Tampere, Finland
- Department of Medicine, Helsinki University Central Hospital, Helsinki, Finland
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Miao JY, Cai Y, Chan YF, Sheng P, Wang N. A Novel Carbon Nanotube Structure Formed in Ultra-Long Nanochannels of Anodic Aluminum Oxide Templates. J Phys Chem B 2006. [DOI: 10.1021/jp068015s] [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: 11/28/2022]
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Miao JY, Cai Y, Chan YF, Sheng P, Wang N. A Novel Carbon Nanotube Structure Formed in Ultra-Long Nanochannels of Anodic Aluminum Oxide Templates. J Phys Chem B 2006; 110:2080-3. [PMID: 16471786 DOI: 10.1021/jp055722x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the fabrication of a novel carbon structure consisting of uniform carbon nanotubes formed in the nanochannels of anodic aluminum oxide (AAO) templates, with the surface side open and connected by a uniform carbon sheet. The uniformity of the fabricated CNT arrays, plus the carbon film on the AAO surface interconnecting the open ends of all CNTs, constitute the major characteristics unique to our carbon structures. Some potential applications of such structures are noted.
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Affiliation(s)
- J Y Miao
- Department of Physics and Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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Li J, Zhou L, Chan CT, Sheng P. Photonic band gap from a stack of positive and negative index materials. Phys Rev Lett 2003; 90:083901. [PMID: 12633427 DOI: 10.1103/physrevlett.90.083901] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2002] [Indexed: 05/24/2023]
Abstract
Layered heterostructures combining ordinary and negative refractive index materials are shown to display a new type of photonic band gap corresponding to zero (volume) averaged refractive index. Distinct from band gaps induced by Bragg scattering, the zero-n; gap is invariant upon a change of scale length and is insensitive to disorder that is symmetric in the random variable. A metallic structure that exhibits such a band gap is explicitly designed, and its properties are calculated with accurate finite difference time domain simulations.
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Affiliation(s)
- Jensen Li
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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Wang ZL, Chan CT, Zhang WY, Chen Z, Ming NB, Sheng P. Optical properties of inverted opal photonic band gap crystals with stacking disorder. Phys Rev E Stat Nonlin Soft Matter Phys 2003; 67:016612. [PMID: 12636630 DOI: 10.1103/physreve.67.016612] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2001] [Revised: 11/05/2002] [Indexed: 05/24/2023]
Abstract
We present a detailed study of the effect of planar stacking disorder on optical properties of inverted opal photonic crystals. Systems with periodic stacking sequences are first studied that include face centered cubic, hexagonal close-packed, and doubly hexagonal close-packed photonic crystals. For the structures with periodic stacking order, we evaluate the band structure followed by calculation of transmission spectrum along the direction perpendicular to the hexagonal close-packing plane of the structures. Inverted opal photonic crystals with random stacking sequences are then studied by calculating average transmittance of the photonic crystal slabs over various random stacking configurations. The position and width of the lowest stop gap along the direction normal to the hexagonal close-packing plane is found to be invariant, regardless of the stacking sequence in the photonic crystal. We show how the propagation properties at higher frequencies are affected by the stacking configurations (both periodic and disordered stacking sequences), particularly those near the edges of the absolute band gap. The obtained results are directly relevant to transmission/reflection experiments on inverted opal photonic crystals with complete band gap.
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Affiliation(s)
- Z L Wang
- National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
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Abstract
Investigation of the magnetic and transport properties of single-walled small-diameter carbon nanotubes embedded in a zeolite matrix revealed that at temperatures below 20 kelvin, 4 angstrom tubes exhibit superconducting behavior manifest as an anisotropic Meissner effect, with a superconducting gap and fluctuation supercurrent. The measured superconducting characteristics display smooth temperature variations owing to one-dimensional fluctuations, with a mean-field superconducting transition temperature of 15 kelvin. Statistical mechanic calculations based on the Ginzburg-Landau free-energy functional yield predictions that are in excellent agreement with the experiments.
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Affiliation(s)
- Z K Tang
- Department of Physics and Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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19
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Zhang XX, Wan C, Liu H, Li ZQ, Sheng P, Lin JJ. Giant Hall effect in nonmagnetic granular metal films. Phys Rev Lett 2001; 86:5562-5565. [PMID: 11415301 DOI: 10.1103/physrevlett.86.5562] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2000] [Indexed: 05/23/2023]
Abstract
Nearly 3 orders of magnitude enhancement in the Hall coefficient is observed in Cu(x)-(SiO(2))(1--x) granular films. This large enhancement of the Hall coefficient not only is significantly larger than the prediction of the classical percolation theory, but also occurs at a metal concentration identified to be the quantum percolation threshold. Measurements of the electron dephasing length and magnetoresistance, plus the TEM characterization of microstructures, yield a physical picture consistent with the mechanism of the local quantum interference effect.
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Affiliation(s)
- X X Zhang
- Department of Physics and Institute of Nano Science & Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
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20
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Zhang W, Chan CT, Sheng P. Multiple scattering theory and its application to photonic band gap systems consisting of coated spheres. Opt Express 2001; 8:203-208. [PMID: 19417805 DOI: 10.1364/oe.8.000203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The vector wave multiple scattering method is a reliable and efficient technique in treating the photonic band gap problem for photonic crystals composed of spherically scattering objects with metallic components. In this paper, we describe the formalism and its application to the photonic band structures of systems comprising of metallo-dielectric spheres. We show that the photonic band gaps are essentially determined by local short-range order rather than by the translational symmetry if the volume fraction of the metallic core is high.
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Abstract
We report a novel form of planar magnetic colloidal crystals formed by coated magnetic microspheres floating on a liquid meniscus. Under an external magnetic field, the balance between the repulsive magnetic interaction and the "attractive" interaction, due to the weight of the particles projected along the surface tangent, yields not only the triangular lattice with a variable lattice constant, but also all the other planar crystal symmetries such as the oblique, centered-rectangular, rectangular, and square lattices. By using two different sized magnetic particles, local formations of 2D quasi-crystallites with fivefold symmetry are also observed.
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Affiliation(s)
- W Wen
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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Abstract
We have fabricated sonic crystals, based on the idea of localized resonant structures, that exhibit spectral gaps with a lattice constant two orders of magnitude smaller than the relevant wavelength. Disordered composites made from such localized resonant structures behave as a material with effective negative elastic constants and a total wave reflector within certain tunable sonic frequency ranges. A 2-centimeter slab of this composite material is shown to break the conventional mass-density law of sound transmission by one or more orders of magnitude at 400 hertz.
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Affiliation(s)
- Z Liu
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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25
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Zhang WY, Lei XY, Wang ZL, Zheng DG, Tam WY, Chan CT, Sheng P. Robust photonic band gap from tunable scatterers. Phys Rev Lett 2000; 84:2853-2856. [PMID: 11018959 DOI: 10.1103/physrevlett.84.2853] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/1999] [Indexed: 05/23/2023]
Abstract
We show theoretically and experimentally that photonic band gaps can be realized using metal or metal-coated spheres as building blocks. Robust photonic gaps exist in any periodic structure built from such spheres when the filling ratio of the spheres exceeds a threshold. The frequency and the size of the gaps depend on the local order rather than on the symmetry or the global long range order. Good agreement between theory and experiment is obtained in the microwave regime. Calculations show that the approach can be scaled up to optical frequencies even in the presence of absorption.
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Affiliation(s)
- WY Zhang
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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26
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Zhang ZQ, Jones IP, Schriemer HP, Page JH, Weitz DA, Sheng P. Wave transport in random media: the ballistic to diffusive transition. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1999; 60:4843-50. [PMID: 11970349 DOI: 10.1103/physreve.60.4843] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/1999] [Indexed: 04/18/2023]
Abstract
The character of wave transport through a strongly scattering medium, excited by a pulsed plane-wave source, is investigated as a function of sample thickness over the range from about one to 13 mean free paths. To examine the behavior theoretically, we perform a first-principles calculation of both the frequency correlation function of the transmitted field and the time-domain profile of the transmitted intensity. These quantities are investigated experimentally using an ultrasonic technique, which allows us to separate the ballistic and scattered components of the total transmitted field, and hence to measure the scattered component unambiguously in thin samples. For sample thicknesses greater than about four mean free paths, we find good agreement between our theory, the diffusion approximation, and our experimental data for both the frequency correlation function and the intensity time profile. In thinner samples, there are systematic differences between theory and experiment. To characterize the transition from ballistic to diffusive behavior in thin samples, we focus on the arrival time of the peak in the scattered component of the transmitted intensity; unexpectedly we find that the scattered peak arrival time exhibits an abrupt crossover between ballistic and diffusive behavior when the ratio of sample thickness to mean free path, L/l, is approximately equal to 3. Excellent agreement is obtained between our theory and experiment for this crossover behavior over the entire range of sample thicknesses investigated.
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Affiliation(s)
- Z Q Zhang
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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27
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Jiang Z, Sheng P, Qi F. [8 cases of adrenal gland cysts]. Hunan Yi Ke Da Xue Xue Bao 1999; 24:585-6. [PMID: 12080731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
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28
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Lu W, Sheng P. [Via the submandible: cervical glossopharyngeal neurectomy and histomorphology findings]. Lin Chuang Er Bi Yan Hou Ke Za Zhi 1997; 11:346-8. [PMID: 10323031] [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: 04/13/2023]
Abstract
Three cases of serious idiopathic glossopharyngeal neuralgia are reported. They were treated with cervical glossopharyngeal neurectomy via the submandible. The resected nerve tissue was detected under light and microscope. The pathological change was found in the form of myelinoclasis. The present article is intended to introduce a method via the submandible, comparing the intracranial and extracranial approach. We think the procedure via the submandible is a method more safe, simple and therefore, worthy to be recommended.
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Affiliation(s)
- W Lu
- Department of Otolaryngology, Sixth Hospital of Shanghai
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29
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Ugur M, Drummond RM, Zou H, Sheng P, Singer JJ, Walsh JV. An ATP-gated cation channel with some P2Z-like characteristics in gastric smooth muscle cells of toad. J Physiol 1997; 498 ( Pt 2):427-42. [PMID: 9032690 PMCID: PMC1159212 DOI: 10.1113/jphysiol.1997.sp021869] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [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: 02/03/2023] Open
Abstract
1. Whole-cell and single-channel currents elicited by extracellular ATP were studied in freshly dissociated smooth muscle cells from the stomach of the toad Bufo marinus using standard patch clamp and microfluorimetric techniques. 2. This ATP-gated cation channel shares a number of pharmacological and functional properties with native rat myometrium receptors, certain native P2Z purinoceptors and the recently cloned P2X7 purinoceptor. But, unlike the last two, the ATP-gated channel does not mediate the formation of large non-specific pores. Thus, it may represent a novel member of the P2X or P2Z class. 3. Extracellular application of ATP (> or = 150 microM) elicited an inward whole-cell current at negative holding potentials that was inwardly rectifying and showed no sign of desensitization. Na+, Cs+ and, to a lesser degree, the organic cation choline served as charge carriers, but Cl- did not. Ratiometric fura-2 measurements indicated that the current is carried in part by Ca2+. The EC50 for ATP was 700 microM in solutions with a low divalent cation concentration. 4. ATP (> or = 100 microM) at the extracellular surface of cell-attached or excised patches elicited inwardly rectifying single-channel currents with a 22 pS conductance. Cl- did not serve as a charge carrier but both Na+ and Cs+ did, as did choline to a lesser extent. The mean open time of the channel was quite long, with a range in hundreds of milliseconds at a holding potential of -70 mV. 5. Mg2+ and Ca2+ decreased the magnitude of the ATP-induced whole-cell currents. Mg2+ decreased both the amplitude and the activity of ATP-activated single-channel currents. 6. ADP, UTP, P1, P5-di-adenosine pentaphosphate (AP5A), adenosine and alpha, beta-methylene ATP (alpha, beta-Me-ATP) did not induce significant whole-cell current. ATP-gamma-S and 2-methylthio ATP (2-Me-S-ATP) were significantly less effective than ATP in inducing whole-cell currents, whereas benzoylbenzoyl ATP (BzATP) was more effective. BzATP, alpha, beta-Me-ATP, ATP-gamma-S and 2-Me-S-ATP induced single-channel currents, but a higher concentration of alpha, beta-Me-ATP was required. 7. BzATP did not induce the formation of large non-specific pores, as assayed using mag-fura-2 as a high molecular mass probe.
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Affiliation(s)
- M Ugur
- Department of Physiology, University of Massachusetts Medical School, Worcester 01655, USA
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Abstract
Methamphetamine (METH) caused dose-dependent increases in AP-1 DNA-binding activity in both nontransgenic (Non-Tg) and CuZn-SOD transgenic (SOD-Tg) mice. However, the increases in SOD-Tg mice were less prominent than those observed in Non-Tg animals. The time-course of METH-induced AP-1 changes was similar in both strains of mice. AP-1 binding activity showed an initial increase at 1 h, peaked at 3 h, and then gradually declined. AP-1 binding activity was back to normal by the 72-h time point. Regional analyses of METH effects revealed increases in the caudate putamen and cerebellum, with the striatum showing relatively higher METH-induced AP-1 DNA-binding activation. These regional effects were also attenuated in the SOD-Tg mice. These data indicate that METH-induced stimulation of AP-1 DNA-binding depends on cellular redox status. These results are consistent with in vitro studies that have reported that several transcription factors are regulated through redox mechanisms.
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Affiliation(s)
- P Sheng
- Section of Molecular Neuropsychiatry, Intramural Research Program, NIH/NIDA, Baltimore, Maryland 21224, USA
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Sheng P, Ladenheim B, Moran TH, Wang XB, Cadet JL. Methamphetamine-induced neurotoxicity is associated with increased striatal AP-1 DNA-binding activity in mice. Brain Res Mol Brain Res 1996; 42:171-4. [PMID: 8915598 DOI: 10.1016/s0169-328x(96)00192-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Multiple injections of methamphetamine (METH) produce long-lasting neurotoxic effects on the nigrostriatal dopamine (DA) system. The drug also causes increases in AP-1 DNA-binding activity in mice. In the present study, we tested the idea that toxic doses of METH might cause long-term increases in AP-1 DNA-binding. Mice were given 10 mg/kg of METH 2, 3 or 4 times at a 2 h interval in 1 day. Striatal DA levels were markedly decreased at 3 h and 24 h in all injection groups. After 1 week, striatal DA level recovered to near control in the METH x2 group, but were still significantly decreased in the METH x3 and x4 groups. Similar drug administration schedules caused increases in AP-1 DNA-binding activity at the 3 h time point in all groups. The AP-1-binding activity almost returned back to control level in the x2 and x3 injection groups at the 24 h and 1 week time point, but there were still increased levels of AP-1-binding activity in the METH x4 group. These findings raise the possibility that METH-induced neurotoxicity might involve prolonged activation of AP-1 transcription factor. This might be related to the report that c-fos or c-jun activation may be important in some models of neurodegeneration.
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Affiliation(s)
- P Sheng
- Molecular Neuropsychiatry Section, NIH/NIDA IRP, Baltimore, MD 21224, USA
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Sheng P, Cerruti C, Ali S, Cadet JL. Nitric oxide is a mediator of methamphetamine (METH)-induced neurotoxicity. In vitro evidence from primary cultures of mesencephalic cells. Ann N Y Acad Sci 1996; 801:174-86. [PMID: 8959032 DOI: 10.1111/j.1749-6632.1996.tb17440.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [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: 02/03/2023]
Abstract
METH is a monoaminergic toxic that destroys dopamine terminals in vivo. Oxidative mechanisms associated with DA metabolism are thought to play an important role in its toxic effects. These ideas were supported by the demonstration that CuZn-superoxide dismutase (CuZnSOD) transgenic mice were protected against the toxic effects of the drug. In the present study, we sought to determine if nitric oxide (NO) production was also involved in METH-induced neurotoxicity using primary cultures obtained from fetal rat mesencephalon. METH caused dose- and time-dependent cell death in vitro. Blockade of nitric oxide (NO) formation with several nitric oxide (NO) synthase blockers attenuated METH-mediated toxicity. Moreover, inhibition of ADP-ribosylation with nicotinamide and benzamide also provided protection against the toxicity of the drug. These results, together with our previous results in transgenic mice, support a role for free radicals in METH-induced toxic effects.
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Affiliation(s)
- P Sheng
- Molecular Neuropsychiatry Section, NIH/NIDA/IRP, Baltimore, Maryland 21224, USA
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Wang G, Weiss C, Sheng P, Bresnick E. Retrovirus-mediated transfer of the human O6-methylguanine-DNA methyltransferase gene into a murine hematopoietic stem cell line and resistance to the toxic effects of certain alkylating agents. Biochem Pharmacol 1996; 51:1221-8. [PMID: 8645346 DOI: 10.1016/0006-2952(96)00077-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [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: 02/01/2023]
Abstract
O6-Methylguanine-DNA methyltransferase (MGMT) is an important DNA repair protein that plays a key role in cancer chemotherapy by alkylating agents such as carmustine (BCNU) and Dacarbazine (DTIC). Therapy by BCNU and DTIC is reduced by dose-limiting hematological toxicity as a result of low MGMT repair activity in bone marrow cells. In this study, we have constructed a Moloney murine leukemia virus retroviral vector containing the human mgmt gene. High-titer retrovirus producer cells lines have been generated. Retroviral-mediated transfer of the human mgmt gene into murine multi-potent hematopoietic stem cells, FDCP-1, resulted in the expression of a high level of MGMT activity. In comparison with the control cells that were transduced with the parent vector, the MGMT-expressing clones were considerably more resistant to the cytotoxicity of the methylating agents, such as N-methyl-N'-nitro-N-nitrosoguanidine, N-nitroso-N-methyl-urea, and temozolomide, as well as the chloroethylating agents 1-(2-chloroethyl)-1-nitrosourea and BCNU. The protection provided by MGMT could be eliminated by the MGMT inactivator O6-benzylguanine. Thus, the principal lethal lesions produced by these alkylating agents in the murine hematopoietic stem cells and the MGMT deficiency in these cells can be complemented by retroviral-mediated gene transduction.
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Affiliation(s)
- G Wang
- Department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, NH, USA
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37
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Ding M, Sheng P, Zhi Z. Environmental radiation real-time monitoring system permanently installed near Qinshan Nuclear Power Plant. Health Phys 1996; 70:415-417. [PMID: 8609035 DOI: 10.1097/00004032-199603000-00012] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
An environmental radiation real-time monitoring system with high pressure ionization chamber was developed. It has been installed permanently in the vicinity of Qinshan Nuclear Power Plant, the first built in mainland China. The system consists of four basic components: environmental radiation monitors; data communication network; a data processing center; and a remote terminal computer situated in Hangzhou. It has provided five million readings of environmental radiation levels as of January 1993.
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Affiliation(s)
- M Ding
- Zhejiang Province Environmental Monitoring Centre, Hangzhou, China
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38
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Cerruti C, Sheng P, Ladenheim B, Epstein CJ, Cadet JL. Involvement of oxidative and L-arginine-NO pathways in the neurotoxicity of drugs of abuse in vitro. Clin Exp Pharmacol Physiol 1995; 22:381-2. [PMID: 7554438 DOI: 10.1111/j.1440-1681.1995.tb02025.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
1. Inhibitors of nitric oxide (NO) formation or ADP-ribosylation attenuate methamphetamine (METH)- and methylenedioxymetamphetamine (MDMA)-induced neurotoxicity on dopaminergic and serotonergic cells in primary cultures. 2. They also prevent METH-induced reactive gliosis in dopaminergic cultures. 3. Overexpression of superoxide dismutase (SOD) in cells obtained from SOD-transgenic mice also attenuates drug-induced toxicity. 4. These data indicate a role for oxygen-based and NO free radicals in the mechanisms of cell death associated with drugs of abuse in vitro.
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Affiliation(s)
- C Cerruti
- Molecular Neuropsychiatry Section, NIH/NIDA/Division of Intramural Research, Baltimore, Maryland 21224, USA
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40
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Zhang ZQ, Sheng P. Quantum transport in porous media: Inelastic scattering of 4He atoms and its temperature dependence. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1994; 49:3050-3060. [PMID: 9961570 DOI: 10.1103/physreve.49.3050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Cadet JL, Sheng P, Ali S, Rothman R, Carlson E, Epstein C. Attenuation of methamphetamine-induced neurotoxicity in copper/zinc superoxide dismutase transgenic mice. J Neurochem 1994; 62:380-3. [PMID: 7505315 DOI: 10.1046/j.1471-4159.1994.62010380.x] [Citation(s) in RCA: 219] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Administration of methamphetamine (METH) to rats and nonhuman primates causes loss of terminals in the nigrostriatal dopaminergic system. The mechanism by which METH causes its neurotoxicity is not known. To evaluate further the role of oxyradicals in METH-induced neurotoxicity, we have tested its effects in CuZn superoxide dismutase (SOD) transgenic (Tg) mice, which express the human CuZnSOD gene. In non-Tg mice, acute METH administration causes significant decreases in levels of dopamine (DA) and 3,4-dihydroxyphenylacetic acid (DOPAC) in the striata and cortices of non-Tg mice. In contrast, there were no significant decreases in cortical or striatal DA in the SOD-Tg mice. The effects of METH on DOPAC were also attenuated in both structures of these SOD-Tg mice. Chronic METH administration caused decreases in levels of striatal DA and DOPAC in the non-Tg mice, whereas the SOD-Tg mice were not affected. These results suggest that METH-induced dopaminergic toxicity in mice may be secondary to increased production of reactive oxygen species such as the superoxide radical.
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Affiliation(s)
- J L Cadet
- Molecular Neuropsychiatry Section, NIH/NIDA, Baltimore, Maryland 21224
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Abstract
We examined the effects of methamphetamine (METH) in an in vitro model of rat fetal mesencephalic cells. METH causes loss of dopamine (DA) cells and neuronal process degeneration. In addition, the drug causes an increase in reactive gliosis as shown by the number of cells that stain for and by the intensity of staining with a glial fibrillary acidic protein (GFAP) antibody. Co-incubation of METH-treated cells with benzamide, which is a known inhibitor of ADP-ribosylation (ADPR), attenuated METH effects on both DA and glial cells. However, the effects of benzamide were somewhat more prominent on the glial cells. These results suggest that ADP-ribosylation may play a very important role in the development of reactive gliosis after the administration of neurotoxic agents.
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Affiliation(s)
- P Sheng
- Molecular Neuropsychiatry Section NIH, NIDA, Addiction Research Center, Baltimore, Maryland 21224
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45
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Zhou M, Sheng P. Shear rigidity percolation in 2D solid-liquid composites. Phys Rev Lett 1993; 71:4358-4360. [PMID: 10055226 DOI: 10.1103/physrevlett.71.4358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ye L, Liu J, Sheng P, Weitz DA. Sound propagation in suspensions of solid spheres. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1993; 48:2805-2815. [PMID: 9960915 DOI: 10.1103/physreve.48.2805] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Abstract
This paper presents a method for reducing the thermal damage of composite materials during laser grooving. The method utilizes a water jet in tandem with the laser beam in an attempt to control the heat conducted into the workpiece. The paper presents a theoretical analysis for determining the relationships between groove depth and heat affected zone, and the laser and water jet operating parameters. The theoretical analysis accounts for the effect of the heat transfer due to the water jet. The predictions of the analysis are compared with experimental results whereby the heat-affected zone is reduced up to 70 percent by using a water jet. The paper includes experimental findings regarding the optimum operating point of the water jet for minimizing the heat-affected zone (HAZ) and maximizing the achievable groove depth.
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Affiliation(s)
- G. Chryssolouris
- Laboratory for Manufacturing and Productivity, MIT, Cambridge, MA 02139
| | - P. Sheng
- Laboratory for Manufacturing and Productivity, MIT, Cambridge, MA 02139
| | - N. Anastasia
- Laboratory for Manufacturing and Productivity, MIT, Cambridge, MA 02139
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Ye L, Cody G, Zhou M, Sheng P, Norris AN. Observation of bending wave localization and quasi mobility edge in two dimensions. Phys Rev Lett 1992; 69:3080-3083. [PMID: 10046720 DOI: 10.1103/physrevlett.69.3080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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