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Bai S, Zhang XD, Zou YQ, Lin YX, Liu ZY, Li KW, Huang P, Yoshida T, Liu YL, Li MS, Zhang W, Wang XJ, Zhang M, Du C. Development of high-efficiency superparamagnetic drug delivery system with MPI imaging capability. Front Bioeng Biotechnol 2024; 12:1382085. [PMID: 38572358 PMCID: PMC10987818 DOI: 10.3389/fbioe.2024.1382085] [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: 02/05/2024] [Accepted: 03/11/2024] [Indexed: 04/05/2024] Open
Abstract
In this study, a high-efficiency superparamagnetic drug delivery system was developed for preclinical treatment of bladder cancer in small animals. Two types of nanoparticles with magnetic particle imaging (MPI) capability, i.e., single- and multi-core superparamagnetic iron oxide nanoparticles (SPIONs), were selected and coupled with bladder anti-tumor drugs by a covalent coupling scheme. Owing to the minimal particle size, magnetic field strengths of 270 mT with a gradient of 3.2 T/m and 260 mT with a gradient of 3.7 T/m were found to be necessary to reach an average velocity of 2 mm/s for single- and multi-core SPIONs, respectively. To achieve this, a method of constructing an in vitro magnetic field for drug delivery was developed based on hollow multi-coils arranged coaxially in close rows, and magnetic field simulation was used to study the laws of the influence of the coil structure and parameters on the magnetic field. Using this method, a magnetic drug delivery system of single-core SPIONs was developed for rabbit bladder therapy. The delivery system consisted of three coaxially and equidistantly arranged coils with an inner diameter of Φ50 mm, radial height of 85 mm, and width of 15 mm that were positioned in close proximity to each other. CCK8 experimental results showed that the three types of drug-coupled SPION killed tumor cells effectively. By adjusting the axial and radial positions of the rabbit bladder within the inner hole of the delivery coil structure, the magnetic drugs injected could undergo two-dimensional delivery motions and were delivered and aggregated to the specified target location within 12 s, with an aggregation range of about 5 mm × 5 mm. In addition, the SPION distribution before and after delivery was imaged using a home-made open-bore MPI system that could realistically reflect the physical state. This study contributes to the development of local, rapid, and precise drug delivery and the visualization of this process during cancer therapy, and further research on MPI/delivery synchronization technology is planned for the future.
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Affiliation(s)
- Shi Bai
- Department of Information Engineering, Shenyang University of Technology, Shenyang, China
| | - Xiao-dan Zhang
- Department of Information Engineering, Shenyang University of Technology, Shenyang, China
| | - Yu-qi Zou
- Department of Information Engineering, Shenyang University of Technology, Shenyang, China
| | - Yu-xi Lin
- Department of Information Engineering, Shenyang University of Technology, Shenyang, China
| | - Zhi-yao Liu
- Department of Information Engineering, Shenyang University of Technology, Shenyang, China
| | - Ke-wen Li
- Department of Information Engineering, Shenyang University of Technology, Shenyang, China
| | - Ping Huang
- Department of Information Engineering, Shenyang University of Technology, Shenyang, China
| | - Takashi Yoshida
- Department of Electrical Engineering, Kyushu University, Fukuoka, Japan
| | - Yi-li Liu
- Department of Urology, Fourth Affiliated Hospital of China Medical University, Shenyang, China
| | - Ming-shan Li
- Department of Urology, Fourth Affiliated Hospital of China Medical University, Shenyang, China
| | - Wei Zhang
- Department of Oncology, General Hospital of Northern Theater Command, Shenyang, China
| | - Xiao-ju Wang
- Department of Foreign Languages, Liaoning Vocational and Technical College of Economics, Shenyang, China
| | - Min Zhang
- First Affiliated Hospital, China Medical University, Shenyang, China
| | - Cheng Du
- Department of Oncology, General Hospital of Northern Theater Command, Shenyang, China
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Wan X, Wang L, Chang J, Zhang J, Zhang Z, Li K, Sun G, Liu C, Zhong Y. Effective synthesis of high-content fructooligosaccharides in engineered Aspergillus niger. Microb Cell Fact 2024; 23:76. [PMID: 38461254 PMCID: PMC10924377 DOI: 10.1186/s12934-024-02353-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 03/01/2024] [Indexed: 03/11/2024] Open
Abstract
BACKGROUND Aspergillus niger ATCC 20611 is an industrially important fructooligosaccharides (FOS) producer since it produces the β-fructofuranosidase with superior transglycosylation activity, which is responsible for the conversion of sucrose to FOS accompanied by the by-product (glucose) generation. This study aims to consume glucose to enhance the content of FOS by heterologously expressing glucose oxidase and peroxidase in engineered A. niger. RESULTS Glucose oxidase was successfully expressed and co-localized with β-fructofuranosidase in mycelia. These mycelia were applied to synthesis of FOS, which possessed an increased purity of 60.63% from 52.07%. Furthermore, peroxidase was expressed in A. niger and reached 7.70 U/g, which could remove the potential inhibitor of glucose oxidase to facilitate the FOS synthesis. Finally, the glucose oxidase-expressing strain and the peroxidase-expressing strain were jointly used to synthesize FOS, which content achieved 71.00%. CONCLUSIONS This strategy allows for obtaining high-content FOS by the multiple enzymes expressed in the industrial fungus, avoiding additional purification processes used in the production of oligosaccharides. This study not only facilitated the high-purity FOS synthesis, but also demonstrated the potential of A. niger ATCC 20611 as an enzyme-producing cell factory.
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Affiliation(s)
- Xiufen Wan
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, 266237, People's Republic of China
| | - Lu Wang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, 266237, People's Republic of China
| | - Jingjing Chang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, 266237, People's Republic of China
| | - Jing Zhang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, 266237, People's Republic of China
| | - Zhiyun Zhang
- Shandong Academy of Pharmaceutical Sciences, Jinan, 250101, People's Republic of China
| | - Kewen Li
- Baolingbao Biology Co., Ltd, Dezhou, 251299, People's Republic of China
| | - Guilian Sun
- Baolingbao Biology Co., Ltd, Dezhou, 251299, People's Republic of China
| | - Caixia Liu
- Shandong Academy of Pharmaceutical Sciences, Jinan, 250101, People's Republic of China.
| | - Yaohua Zhong
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, 266237, People's Republic of China.
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Hu M, Zhang T, Miao M, Li K, Luan Q, Sun G. Expectations for employing Escherichia coli Nissle 1917 in food science and nutrition. Crit Rev Food Sci Nutr 2024:1-9. [PMID: 38189668 DOI: 10.1080/10408398.2023.2301416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
As a promising probiotic strain, Escherichia coli Nissle 1917 (EcN) has been demonstrated to confer beneficial effects on intestinal health, immune function, and pathogen prevention. Additionally, EcN has also been widely studied due to its clear genomic information, tractable gene regulation, and simple growth conditions. This review summarizes the various applications potential of EcN in food science and nutrition, including inflammation prevention, tumor-targeting therapy, antibacterial agents for food, and nutrient production with a focus on specific case studies. Moreover, we highlight the major challenges of employing EcN in food science and nutrition, including regulatory approval, stability during food processing, and consumer acceptance. Finally, we conclude with a discussion on perspectives related to employing EcN in food science and nutrition.
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Affiliation(s)
- Miaomiao Hu
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China
| | - Tao Zhang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China
- International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, Jiangsu, China
| | - Ming Miao
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China
- International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, Jiangsu, China
| | - Kewen Li
- Baolingbao Biology Co., Ltd, Yucheng, Shandong, China
| | - Qingmin Luan
- Baolingbao Biology Co., Ltd, Yucheng, Shandong, China
| | - Guilian Sun
- Baolingbao Biology Co., Ltd, Yucheng, Shandong, China
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Hu M, Miao M, Li K, Luan Q, Sun G, Zhang T. Human milk oligosaccharide lacto-N-tetraose: Physiological functions and synthesis methods. Carbohydr Polym 2023; 316:121067. [PMID: 37321746 DOI: 10.1016/j.carbpol.2023.121067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 06/17/2023]
Abstract
Human milk oligosaccharides (HMOs) have attracted considerable attention due to their unique role in boosting infant health. Among the HMOs, lacto-N-tetraose (LNT) is a significant constituent associated with various health benefits, such as prebiotic effects, antiadhesive antimicrobials, antiviral protection, and immune modulators. LNT has received a "Generally Recognized as Safe" status by the American Food and Drug Administration and was approved as a food ingredient for infant formula. However, the limited availability of LNT poses a major challenge for its application in food and medicine. In this review, we first explored the physiological functions of LNT. Next, we describe several synthesis methods for production of LNT, including chemical, enzymatic, and cell factory approaches, and summarize the pivotal research results. Finally, challenges and opportunities for the large-scale synthesis of LNT were discussed.
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Affiliation(s)
- Miaomiao Hu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Ming Miao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China; International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Kewen Li
- Baolingbao Biology Co., Ltd., Yucheng, Shandong 251200, China
| | - Qingmin Luan
- Baolingbao Biology Co., Ltd., Yucheng, Shandong 251200, China
| | - Guilian Sun
- Baolingbao Biology Co., Ltd., Yucheng, Shandong 251200, China
| | - Tao Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China; International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, Jiangsu 214122, China.
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Sheng C, Tan X, Huang Q, Li K, Zhou C, Guo M. Correction: Sheng et al. Antibacterial and Angiogenic Poly(ionic liquid) Hydrogels. Gels 2022, 8, 476. Gels 2023; 9:472. [PMID: 37367176 DOI: 10.3390/gels9060472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 05/25/2023] [Indexed: 06/28/2023] Open
Abstract
In the original publication [...].
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Affiliation(s)
- Chengju Sheng
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Xuemei Tan
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Qing Huang
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Kewen Li
- College of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China
| | - Chao Zhou
- Institute of Biomedical Engineering and Health Sciences, Changzhou University, Changzhou 213164, China
| | - Mingming Guo
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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6
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Li K, Li Y. Adaptive NN Optimal Consensus Fault-Tolerant Control for Stochastic Nonlinear Multiagent Systems. IEEE Trans Neural Netw Learn Syst 2023; 34:947-957. [PMID: 34432637 DOI: 10.1109/tnnls.2021.3104839] [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: 06/13/2023]
Abstract
This article investigates the problem of adaptive neural network (NN) optimal consensus tracking control for nonlinear multiagent systems (MASs) with stochastic disturbances and actuator bias faults. In control design, NN is adopted to approximate the unknown nonlinear dynamic, and a state identifier is constructed. The fault estimator is designed to solve the problem raised by time-varying actuator bias fault. By utilizing adaptive dynamic programming (ADP) in identifier-critic-actor construction, an adaptive NN optimal consensus fault-tolerant control algorithm is presented. It is proven that all signals of the controlled system are uniformly ultimately bounded (UUB) in probability, and all states of the follower agents can remain consensus with the leader's state. Finally, simulation results are given to illustrate the effectiveness of the developed optimal consensus control scheme and theorem.
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Li K, Li S, Huang Z, Zhang M, Xu Z. Grey Wolf Optimization algorithm based on Cauchy-Gaussian mutation and improved search strategy. Sci Rep 2022; 12:18961. [PMID: 36348083 PMCID: PMC9643465 DOI: 10.1038/s41598-022-23713-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 11/03/2022] [Indexed: 11/10/2022] Open
Abstract
The traditional Grey Wolf Optimization algorithm (GWO) has received widespread attention due to features of strong convergence performance, few parameters, and easy implementation. However, in actual optimization projects, there are problems of slow convergence speed and easy to fall into local optimal solution. The paper proposed a Grey Wolf Optimization algorithm based on Cauchy-Gaussian mutation and improved search strategy (CG-GWO) in response to the above problems. The Cauchy-Gaussian mutation operator is introduced to increase the population diversity of the leader wolves and improve the global search ability of the algorithm. This work retains outstanding grey wolf individuals through the greedy selection mechanism to ensure the convergence speed of the algorithm. An improved search strategy was proposed to expand the optimization space of the algorithm and improve the convergence accuracy. Experiments are performed with 16 benchmark functions covering unimodal functions, multimodal functions, and fixed-dimension multimodal functions to verify the effectiveness of the algorithm. Experimental results show that compared with four classic optimization algorithms, particle swarm optimization algorithm (PSO), whale optimization algorithm (WOA), sparrow optimization algorithm (SSA), and farmland fertility algorithm (FFA), the CG-GWO algorithm shows better convergence accuracy, convergence speed, and global search ability. The proposed algorithm shows the same better performance compared with a series of improved algorithms such as the improved grey wolf algorithm (IGWO), modified Grey Wolf Optimization algorithm (mGWO), and the Grey Wolf Optimization algorithm inspired by enhanced leadership (GLF-GWO).
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Affiliation(s)
- Kewen Li
- grid.497420.c0000 0004 1798 1132College of Computer Science and Technology, China University of Petroleum (East China), Qingdao, 266580 China
| | - Shaohui Li
- grid.497420.c0000 0004 1798 1132College of Computer Science and Technology, China University of Petroleum (East China), Qingdao, 266580 China
| | - Zongchao Huang
- grid.497420.c0000 0004 1798 1132College of Computer Science and Technology, China University of Petroleum (East China), Qingdao, 266580 China
| | - Min Zhang
- grid.497420.c0000 0004 1798 1132College of Computer Science and Technology, China University of Petroleum (East China), Qingdao, 266580 China
| | - Zhifeng Xu
- grid.497420.c0000 0004 1798 1132College of Computer Science and Technology, China University of Petroleum (East China), Qingdao, 266580 China
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Ma M, Xu Z, Wu H, Li K, Sun G, He J, Sui Z, Corke H. Removal of starch granule-associated surface and channel lipids alters the properties of sodium trimetaphosphate crosslinked maize starch. Int J Biol Macromol 2022; 219:473-481. [PMID: 35917853 DOI: 10.1016/j.ijbiomac.2022.07.219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/25/2022] [Accepted: 07/26/2022] [Indexed: 12/30/2022]
Abstract
Starch granule-associated surface and channel lipids (SGALs) were effectively removed from waxy maize starch (WMS) and normal maize starch (NMS), then the starches were crosslinked by different levels of sodium trimetaphosphate (STMP) (0.25 %, 0.5 %, 1 % and 2 %). The effective removal of SGALs and successful crosslinking, were evidenced by the disappearance of surface-fluorescence and channel-fluorescence of Pro-Q Diamond-stained granules, and the increased phosphorus content respectively. STMP crosslinking increased peak and final viscosity for WMS and NMS. Crosslinking at high STMP levels (0.5 %, 1 % and 2 %) transformed the starch pastes from thixotropic to anti-thixotropic. STMP crosslinking significantly decreased the tan δ values of maize starches, enhancing the elastic structure of the gel. Crosslinked maize starches without SGALs had lower breakdown than crosslinked starches at same STMP level, indicating higher tightened crosslinked starch granules after SGALs removal. Removal of SGALs increased the anti-thixotropy of crosslinked starches, facilitating the reorientation of crosslinked amylopectin/amylose molecules during shearing. Removal of SGALs increased the tan δ values from frequency sweep of WMS and NMS during STMP crosslinking, indicating the presence of surface-lipids and channel-lipids could enhance the elastic gel network structure of crosslinked maize starch.
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Affiliation(s)
- Mengting Ma
- College of Food Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China; Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Zekun Xu
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Huaixiang Wu
- Baolingbao Biology Co., Ltd, Dezhou 253000, China
| | - Kewen Li
- Baolingbao Biology Co., Ltd, Dezhou 253000, China
| | - Guilian Sun
- Baolingbao Biology Co., Ltd, Dezhou 253000, China
| | - Jinxing He
- College of Food Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China.
| | - Zhongquan Sui
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Harold Corke
- Biotechnology and Food Engineering Program, Guangdong Technion-Israel Institute of Technology, Shantou 515063, China; Faculty of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel
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Li Y, Fan Y, Li K, Liu W, Tong S. Adaptive Optimized Backstepping Control-Based RL Algorithm for Stochastic Nonlinear Systems With State Constraints and Its Application. IEEE Trans Cybern 2022; 52:10542-10555. [PMID: 33872177 DOI: 10.1109/tcyb.2021.3069587] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This article investigates the adaptive neural-network (NN) tracking optimal control problem for stochastic nonlinear systems, which contain state constraints and uncertain dynamics. First, to avoid the violation of state constraints in achieving optimal control, the novel barrier optimal performance index functions for subsystems are developed. Second, under the framework of the identifier-actor-critic, the virtual and actual optimal controllers are presented based on the backstepping technique, in which the unknown nonlinear dynamics are learned by the NN approximators. Moreover, the quartic barrier Lyapunov functions are constructed instead of square ones to cope with the Hessian term to ensure the stability of the systems with stochastic disturbance. The proposed optimal control strategy can guarantee the boundedness of closed-loop signals, and the output can follow the given reference signal. Meanwhile, the system states are restricted within some preselected compact sets all the while. Finally, both numerical and practical systems are carried out to further illustrate the validity of the proposed optimal control approach.
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Pei X, Li K, Li Y. A survey of adaptive optimal control theory. Math Biosci Eng 2022; 19:12058-12072. [PMID: 36653986 DOI: 10.3934/mbe.2022561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
This paper makes a survey about the recent development of optimal control based on adaptive dynamic programming (ADP). First of all, based on DP algorithm and reinforcement learning (RL) algorithm, the origin and development of the optimization idea and its application in the control field are introduced. The second part introduces achievements in the optimal control direction, then we classify and summarize the research results of optimization method, constraint problem, structure design in control algorithm and practical engineering process based on optimal control. Finally, the possible future research topics are discussed. Through a comprehensive and complete investigation of its application in many existing fields, this survey fully demonstrates that the optimal control algorithms via ADP with critic-actor neural network (NN) structure, which also have a broad application prospect, and some developed optimal control design algorithms have been applied to practical engineering fields.
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Affiliation(s)
- Xiaoxuan Pei
- College of Science, Liaoning University of Technology, Jinzhou 121001, China
| | - Kewen Li
- College of Science, Liaoning University of Technology, Jinzhou 121001, China
| | - Yongming Li
- College of Science, Liaoning University of Technology, Jinzhou 121001, China
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Li X, Li K. Imbalanced data classification based on improved EIWAPSO-AdaBoost-C ensemble algorithm. APPL INTELL 2022. [DOI: 10.1007/s10489-021-02708-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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12
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Li K, Li Y. Adaptive Neural Network Finite-Time Dynamic Surface Control for Nonlinear Systems. IEEE Trans Neural Netw Learn Syst 2021; 32:5688-5697. [PMID: 33048759 DOI: 10.1109/tnnls.2020.3027335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This article addresses the problem of finite-time neural network (NN) adaptive dynamic surface control (DSC) design for a class of single-input single-output (SISO) nonlinear systems. Such designs adopt NNs to approximate unknown continuous system functions. To avoid the "explosion of complexity" problem, a novel nonlinear filter is developed in control design. Under the framework of adaptive backstepping control, an NN adaptive finite-time DSC design algorithm is proposed by adopting a smooth projection operator and finite-time Lyapunov stable theory. The developed control algorithm means that the tracking error converges to a small neighborhood of origin within finite time, which further verifies that all the signals of the controlled system possess globally finite-time stability (GFTS). Finally, both numerical and practical simulation examples and comparing results are provided to elucidate the superiority and effectiveness of the proposed control algorithm.
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14
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Abstract
While multiscale modeling significantly enhances the capability of molecular simulations of polymer systems, it is well realized that the systematically derived coarse-grained (CG) models generally underestimate the thermomechanical properties. In this work, a charge-based mapping scheme has been adopted to include explicit electrostatic interactions and benchmarked against two typical polymers, atactic poly(methyl methacrylate) (PMMA) and polystyrene (PS). The CG potentials are parameterized against the oligomer bulks of nine monomers per chain to match the essential structural features and the two basic pressure-volume-temperature (PVT) properties, which are obtained from the all-atomistic (AA) molecular dynamics (MD) simulations at a single elevated temperature. The so-parameterized CG potentials are extended with the MD method to simulate the two polymer bulks of one hundred monomers per chain over a wide temperature range. Without any scaling, all the simulated results, including mass densities and bulk moduli at room temperature, thermal expansion coefficients at rubbery and glassy states, and glass transition temperatures (Tg), compare well with the corresponding experimental data. The proposed scheme not only contributes to realistically simulating various thermomechanical properties of both apolar and polar polymers but also allows for directly simulating their electrical properties.
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Affiliation(s)
- Chaofu Wu
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan 417000, P. R. China
| | - Kewen Li
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan 417000, P. R. China
| | - Xutao Ning
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan 417000, P. R. China
| | - Lei Zhang
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan 417000, P. R. China
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15
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Wang L, Li K, Zhang S, Liu C, Zhang Z, Chen J, Gu M. Modeling the Effects of Module Size and Material Property on Thermoelectric Generator Power. ACS Omega 2020; 5:29844-29853. [PMID: 33251419 PMCID: PMC7689681 DOI: 10.1021/acsomega.0c03914] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 11/02/2020] [Indexed: 06/12/2023]
Abstract
It is known that thermoelectric power generators (TEGs) can utilize geothermal resources and recycle waste heat. It is vital to improve the thermoelectric power generation efficiency to economically and efficiently use these thermal resources. In this paper, ANSYS was used to build a three-dimensional model of a very simple TEG with only one pair of p- and n-legs (1-PN-TEG) to find the optimal design. The thickness of the semiconductor elements, the cross-sectional area of p- and n-type semiconductor elements, the heat insulation material, the thickness of copper sheet, and other factors were analyzed to study their effects on the power output of 1-PN-TEG. The results show that the power of TEG increases first and then decreases with the thickness of p- and n-legs (H); the maximum power existed at a specific value of H. The power increases when the cross-sectional areas of p- and n-type semiconductor elements become more extensive, but the power per area decreases. Furthermore, the power increases with the volume of p- and n-type semiconductor elements and tends to be stabilized finally. This observation may be used to estimate how much thermoelectric material is required to generate a specific value of TEG power. The gaps between p- and n-type semiconductor elements were filled with different heat insulation materials. The heat insulation material with lower thermal conductivity had a greater power output. The thickness of the copper sheet, as a conductor between p- and n-type semiconductor elements, was also investigated. The maximum power value was reached when the thickness of the copper sheet was equal to about 1.0 mm. All of the results obtained in this paper might provide a theoretical basis for the configuration and design optimization of a thermoelectric generator, making more efficient use of geothermal resources and the waste heat.
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Affiliation(s)
- Lei Wang
- School
of Energy Resources, China University of
Geosciences (Beijing), 29 Xueyuan Road, 100083 Beijing, China
| | - Kewen Li
- School
of Energy Resources, China University of
Geosciences (Beijing), 29 Xueyuan Road, 100083 Beijing, China
- Stanford
Geothermal Program, Stanford University, Stanford, California 94305-2220, United States
| | - Shuguang Zhang
- China
Pingmei Shenma Group, 63 Jianshe Road, 467000 Pingdingshan City, Henan Province, China
| | - Changwei Liu
- Wuhan
Xinyue Energy Technology Co., Ltd., 430000 Wuhan, Hubei, China
| | - Zhijie Zhang
- China
Pingmei Shenma Group, 63 Jianshe Road, 467000 Pingdingshan City, Henan Province, China
| | - Jinlong Chen
- School
of Energy Resources, China University of
Geosciences (Beijing), 29 Xueyuan Road, 100083 Beijing, China
| | - Mingchuan Gu
- China
Pingmei Shenma Group, 63 Jianshe Road, 467000 Pingdingshan City, Henan Province, China
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16
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Li Y, Li K, Tong S. Adaptive Neural Network Finite-Time Control for Multi-Input and Multi-Output Nonlinear Systems With Positive Powers of Odd Rational Numbers. IEEE Trans Neural Netw Learn Syst 2020; 31:2532-2543. [PMID: 31484136 DOI: 10.1109/tnnls.2019.2933409] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This article investigates the adaptive neural network (NN) finite-time output tracking control problem for a class of multi-input and multi-output (MIMO) uncertain nonlinear systems whose powers are positive odd rational numbers. Such designs adopt NNs to approximate unknown continuous system functions, and a controller is constructed by combining backstepping design and adding a power integrator technique. By constructing new iterative Lyapunov functions and using finite-time stability theory, the closed-loop stability has been achieved, which further verifies that the entire system possesses semiglobal practical finite-time stability (SGPFS), and the tracking errors converge to a small neighborhood of the origin within finite time. Finally, a simulation example is given to elaborate the effectiveness and superiority of the developed.
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17
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Sun B, Dang Y, Zhang F, Li K, Ouyang X, Wang K, Huang Q. Long non‑coding RNA RP1‑163G9.1 is downregulated in gastric adenocarcinoma and is associated with a poor prognosis. Oncol Rep 2019; 41:3575-3585. [PMID: 31002370 DOI: 10.3892/or.2019.7127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Accepted: 04/05/2019] [Indexed: 11/06/2022] Open
Abstract
The aim of the present study was to investigate the expression, function and underlying molecular mechanism of the long non‑coding (lnc) RNA RP1‑163G9.1 in patients with gastric adenocarcinoma (GA). The expression levels of lncRNA RP1‑163G9.1 were determined in 112 paired clinical GA tissues by reverse transcription‑quantitative polymerase chain reaction analysis. Subsequently, the potential clinical values of lncRNA RP1‑163G9.1 were analyzed with statistical methods. Additionally, the function of lncRNA RP1‑163G9.1 was explored at the cellular level using the Cell Counting Kit‑8 proliferation assay, Transwell experiments, fluorescence in situ hybridization (FISH), colony formation assay and flow cytometry. Furthermore, the function of lncRNA RP1‑163G9.1 was assessed in vivo using subcutaneous tumorigenesis experiments in nude mice. lncRNA RP1‑163G9.1 expression in GA tissues and cells was significantly decreased when compared with that in control gastric tissues (P<0.001) or gastric epithelial cells GES‑1 (P<0.05). This finding was associated with the depth of invasion (P=0.001), lymph node metastasis (P=0.009), tumor size (P=0.037) and immunocytochemistry marker Ki‑67 (P=0.010). FISH detection demonstrated that lncRNA RP1‑163G9.1 was primarily located in the cytoplasm. Notably, overexpression of lncRNA RP1‑163G9.1 significantly decreased cell proliferation (P<0.01), colony formation (P<0.01), invasion (P<0.01) and the number of cells at the S‑phase of the cell cycle (P<0.05); However, it did not exert a significant effect on apoptosis (P>0.05). Furthermore, tumor formation experiments revealed that overexpression of lncRNA RP1‑163G9.1 inhibited cancer cell proliferation in nude mice. The present research indicated that low expression of lncRNA RP1‑163G9.1 may be associated with enhanced tumor proliferation and invasion in GA.
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Affiliation(s)
- Baochang Sun
- The School of Basic Medical Sciences, Fujian Medical University, Minhou, Fuzhou, Fujian 350108, P.R. China
| | - Yuan Dang
- Department of Experimental Medicine, Fuzhou General Hospital, Fuzhou, Fujian 350025, P.R. China
| | - Fan Zhang
- The School of Basic Medical Sciences, Fujian Medical University, Minhou, Fuzhou, Fujian 350108, P.R. China
| | - Kewen Li
- The School of Basic Medical Sciences, Fujian Medical University, Minhou, Fuzhou, Fujian 350108, P.R. China
| | - Xiaojuan Ouyang
- The School of Basic Medical Sciences, Fujian Medical University, Minhou, Fuzhou, Fujian 350108, P.R. China
| | - Kai Wang
- The School of Basic Medical Sciences, Fujian Medical University, Minhou, Fuzhou, Fujian 350108, P.R. China
| | - Qiaojia Huang
- The School of Basic Medical Sciences, Fujian Medical University, Minhou, Fuzhou, Fujian 350108, P.R. China
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18
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Li K, Zhou G, Zhai J, Li F, Shao M. Improved PSO_AdaBoost Ensemble Algorithm for Imbalanced Data. Sensors (Basel) 2019; 19:s19061476. [PMID: 30917599 PMCID: PMC6471212 DOI: 10.3390/s19061476] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [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: 01/03/2019] [Revised: 03/18/2019] [Accepted: 03/19/2019] [Indexed: 11/16/2022]
Abstract
The Adaptive Boosting (AdaBoost) algorithm is a widely used ensemble learning framework, and it can get good classification results on general datasets. However, it is challenging to apply the AdaBoost algorithm directly to imbalanced data since it is designed mainly for processing misclassified samples rather than samples of minority classes. To better process imbalanced data, this paper introduces the indicator Area Under Curve (AUC) which can reflect the comprehensive performance of the model, and proposes an improved AdaBoost algorithm based on AUC (AdaBoost-A) which improves the error calculation performance of the AdaBoost algorithm by comprehensively considering the effects of misclassification probability and AUC. To prevent redundant or useless weak classifiers the traditional AdaBoost algorithm generated from consuming too much system resources, this paper proposes an ensemble algorithm, PSOPD-AdaBoost-A, which can re-initialize parameters to avoid falling into local optimum, and optimize the coefficients of AdaBoost weak classifiers. Experiment results show that the proposed algorithm is effective for processing imbalanced data, especially the data with relatively high imbalances.
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Affiliation(s)
- Kewen Li
- College of Computer and Communication Engineering, China University of Petroleum, Qingdao 266580, Shandong, China.
| | - Guangyue Zhou
- College of Computer and Communication Engineering, China University of Petroleum, Qingdao 266580, Shandong, China.
| | - Jiannan Zhai
- Institute for Sensing and Embedded Network Systems Engineering, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, USA.
| | - Fulai Li
- School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China.
| | - Mingwen Shao
- College of Computer and Communication Engineering, China University of Petroleum, Qingdao 266580, Shandong, China.
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19
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Suzuki A, Minto JM, Watanabe N, Li K, Horne RN. Contributions of 3D Printed Fracture Networks to Development of Flow and Transport Models. Transp Porous Media 2018. [DOI: 10.1007/s11242-018-1154-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Liu S, Li K, Hussain I, Oderinde O, Yao F, Zhang J, Fu G. A Conductive Self-Healing Double Network Hydrogel with Toughness and Force Sensitivity. Chemistry 2018. [DOI: 10.1002/chem.201800259] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Shunli Liu
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Kewen Li
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Imtiaz Hussain
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Olayinka Oderinde
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Fang Yao
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Jiuyang Zhang
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Guodong Fu
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
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21
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van Kleeff PJM, Gao J, Mol S, Zwart N, Zhang H, Li KW, de Boer AH. The Arabidopsis GORK K +-channel is phosphorylated by calcium-dependent protein kinase 21 (CPK21), which in turn is activated by 14-3-3 proteins. Plant Physiol Biochem 2018; 125:219-231. [PMID: 29475088 DOI: 10.1016/j.plaphy.2018.02.013] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [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: 10/24/2017] [Revised: 02/11/2018] [Accepted: 02/13/2018] [Indexed: 05/23/2023]
Abstract
Potassium (K+) is a vital ion for many processes in the plant and fine-tuned ion channels control the K+-fluxes across the plasma membrane. GORK is an outward-rectifying K+-channel with important functions in stomatal closure and in root K+-homeostasis. In this study, post-translational modification of the Arabidopsis GORK ion channel and its regulation by 14-3-3 proteins was investigated. To investigate the possible interaction between GORK and 14-3-3s an in vivo pull-down from an Arabidopsis protein extract with recombinant GORK C-terminus (GORK-C) indeed identified endogenous 14-3-3s (LAMBDA, CHI, NU) as binding partners in a phosphorylation dependent manner. However, a direct interaction between 14-3-3's and GORK-C could not be demonstrated. Since the pull-down of 14-3-3s was phosphorylation dependent, we determined GORK-C as substrate for CPK21 phosphorylation and identified three CPK21 phospho-sites in the GORK protein (T344, S518 and S649). Moreover, interaction of 14-3-3 to CPK21 strongly stimulates its kinase activity; an effect that can result in increased GORK phosphorylation and change in activity. Using the non-invasive vibrating probe technique, we measured the predominantly GORK mediated salt induced K+-efflux from wild-type, gork, cpk21, aha2 and 14-3-3 mutant roots. The mutants cpk21 and aha2 did not show statistical significant differences compared to WT. However, two (out of six) 14-3-3 isoforms, CHI and PHI, have a clear function in the salt induced K+-efflux. In conclusion, our results show that GORK can be phosphorylated by CPK21 and suggest that 14-3-3 proteins control GORK activity through binding with and activation of CPK21.
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Affiliation(s)
- P J M van Kleeff
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands.
| | - J Gao
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands.
| | - S Mol
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands.
| | - N Zwart
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands.
| | - H Zhang
- Netherlands Proteomics Centre, Utrecht University - H.R. Kruyt gebouw, Padualaan 8, 3584 CH, Utrecht, The Netherlands.
| | - K W Li
- Department of Molecular and Cellular Neurobiology, Faculty of Earth and Life Sciences, Center for Neurogenomics and Cognitive Research, Neuroscience Campus, Amsterdam, The Netherlands.
| | - A H de Boer
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands.
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22
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Oderinde O, Liu S, Li K, Kang M, Imtiaz H, Yao F, Fu G. Multifaceted polymeric materials in three-dimensional processing (3DP) technologies: Current progress and prospects. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4281] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Olayinka Oderinde
- School of Chemistry and Chemical Engineering Southeast University; Jiangning District Nanjing 211189 China
| | - Shunli Liu
- School of Chemistry and Chemical Engineering Southeast University; Jiangning District Nanjing 211189 China
| | - Kewen Li
- School of Chemistry and Chemical Engineering Southeast University; Jiangning District Nanjing 211189 China
| | - Mengmeng Kang
- School of Chemistry and Chemical Engineering Southeast University; Jiangning District Nanjing 211189 China
| | - Hussain Imtiaz
- School of Chemistry and Chemical Engineering Southeast University; Jiangning District Nanjing 211189 China
| | - Fang Yao
- School of Chemistry and Chemical Engineering Southeast University; Jiangning District Nanjing 211189 China
| | - Guodong Fu
- School of Chemistry and Chemical Engineering Southeast University; Jiangning District Nanjing 211189 China
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23
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Zhang Q, Li K, Yan J, Wang Z, Wu Q, Bi L, Yang M, Han Y. Graphene coating on the surface of CoCrMo alloy enhances the adhesion and proliferation of bone marrow mesenchymal stem cells. Biochem Biophys Res Commun 2018; 497:1011-1017. [PMID: 29470980 DOI: 10.1016/j.bbrc.2018.02.152] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 02/17/2018] [Indexed: 12/26/2022]
Abstract
The objective was to investigate whether a graphene coating could improve the surface bioactivity of a cobalt-chromium-molybdenum-based alloy (CoCrMo). Graphene was produced by chemical vapor deposition and transferred to the surface of the CoCrMo alloy using an improved wet transfer approach. The morphology of the samples was observed, and the adhesion force and stabilization of graphene coating were analyzed by a nanoscratch test and ultrasonication test. In an in vitro study, the adhesion and proliferation of bone marrow mesenchymal stem cells (BMSCs) cultured on the samples were quantified via an Alamar Blue assay and cell counting kit-8 (CCK-8) assay. The results showed that it is feasible to apply graphene to modify the surface of a CoCrMo alloy, and the enhancement of the adhesion and proliferation of BMSCs was also shown in the present study. In conclusion, graphene exhibits considerable potential for enhancing the surface bioactivity of CoCrMo alloy.
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Affiliation(s)
- Qi Zhang
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, PR China; Department of Orthopedics, No. 323 Hospital of Chinese PLA, Xi'an, PR China
| | - Kewen Li
- Department of Orthopedics, Qinghai University Affiliated Hospital, Xining, PR China
| | - Jinhong Yan
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, PR China
| | - Zhuo Wang
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, PR China
| | - Qi Wu
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, PR China
| | - Long Bi
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, PR China
| | - Min Yang
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, PR China
| | - Yisheng Han
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, PR China.
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24
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Li K, Wang C, Yan J, Zhang Q, Dang B, Wang Z, Yao Y, Lin K, Guo Z, Bi L, Han Y. Evaluation of the osteogenesis and osseointegration of titanium alloys coated with graphene: an in vivo study. Sci Rep 2018; 8:1843. [PMID: 29382859 PMCID: PMC5790016 DOI: 10.1038/s41598-018-19742-y] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 01/04/2018] [Indexed: 01/19/2023] Open
Abstract
The aim of this study was to investigate whether a surface coating with graphene could enhance the surface bioactivation of titanium alloys (Ti6Al4V) to further accelerate in vivo osteogenesis and osseointegration at the implant surface. In this study, a New Zealand white rabbit femoral condyle defect model was established. After 4, 12 and 24 weeks, biomechanical testing, micro-computed tomography (Micro-CT) analyses and histological observations were performed. At the highest push-out forces during the test, microstructure parameters, such as the bone volume/total volume fraction (BV/TV) and mineral apposition rate (MAR), of the new bone were significantly higher in the graphene-coated Ti6Al4V group (G-Ti6Al4V) than in the Ti6Al4V group (P < 0.05). Van Gieson (VG) staining showed that the G-Ti6Al4V group had more new bone formation than the Ti6Al4V group, and the G-Ti6Al4V group showed a closer fit between the bone and implant. In conclusion, graphene might be a novel type of nano-coating material for enhancing the surface biological activity of Ti-based alloy materials and may further promote in vivo osteogenesis and osseointegration.
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Affiliation(s)
- Kewen Li
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China.
- Department of Orthopedics, Qinghai University Affiliated Hospital, Xining, 810001, P.R. China.
| | - Chunhui Wang
- Military Frontier Defence Medical Service Tranning Group, Army Medical University, Hutubi, Xinjiang, 831200, P.R. China
| | - Jinhong Yan
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China
| | - Qi Zhang
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China
| | - Baoping Dang
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China
| | - Zhuo Wang
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China
| | - Yun Yao
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China
| | - Kaifeng Lin
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China
| | - Zhongshang Guo
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China
| | - Long Bi
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China
| | - Yisheng Han
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, P.R. China.
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25
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Zhang MJ, Jing N, Li KW, Wang ZB. Thermal stability control system of photo-elastic interferometer in the PEM-FTs. Rev Sci Instrum 2018; 89:013105. [PMID: 29390690 DOI: 10.1063/1.5020714] [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: 06/07/2023]
Abstract
A drifting model for the resonant frequency and retardation amplitude of a photo-elastic modulator (PEM) in the photo-elastic modulated Fourier transform spectrometer (PEM-FTs) is presented. A multi-parameter broadband-matching driving control method is proposed to improve the thermal stability of the PEM interferometer. The automatically frequency-modulated technology of the driving signal based on digital phase-locked technology is used to track the PEM's changing resonant frequency. Simultaneously the maximum optical-path-difference of a laser's interferogram is measured to adjust the amplitude of the PEM's driving signal so that the spectral resolution is stable. In the experiment, the multi-parameter broadband-matching control method is applied to the driving control system of the PEM-FTs. Control of resonant frequency and retardation amplitude stabilizes the maximum optical-path-difference to approximately 236 μm and results in a spectral resolution of 42 cm-1. This corresponds to a relative error smaller than 2.16% (4.28 standard deviation). The experiment shows that the method can effectively stabilize the spectral resolution of the PEM-FTs.
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Affiliation(s)
- M J Zhang
- School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
| | - N Jing
- School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
| | - K W Li
- School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
| | - Z B Wang
- Engineering and Technology Research Center of Shanxi Provincial for Optical-Electric Information and Instrument, North University of China, Taiyuan 030051, China
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26
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Li K, Zhou C, Liu S, Yao F, Fu G, Xu L. Preparation of mechanically-tough and thermo-responsive polyurethane-poly(ethylene glycol) hydrogels. REACT FUNCT POLYM 2017. [DOI: 10.1016/j.reactfunctpolym.2017.06.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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27
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Li K, Yan J, Wang C, Bi L, Zhang Q, Han Y. Graphene modified titanium alloy promote the adhesion, proliferation and osteogenic differentiation of bone marrow stromal cells. Biochem Biophys Res Commun 2017; 489:187-192. [DOI: 10.1016/j.bbrc.2017.05.124] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 05/22/2017] [Indexed: 01/13/2023]
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28
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Liu S, Li K, Yao F, Xu L, Fu G. Lanthanide ions-induced formation of hierarchical and transparent polysaccharide hybrid films. Carbohydr Polym 2017; 163:28-33. [PMID: 28267507 DOI: 10.1016/j.carbpol.2017.01.047] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 12/29/2016] [Accepted: 01/12/2017] [Indexed: 12/22/2022]
Abstract
Nacre-like hybrid films based on N-succinyl chitosan (NSC), sodium alginate (SA) and lanthanide ions were fabricated via coordination interactions. In this work, the binary building blocks (NSC and SA) were self-assembled into aligned hydrogel films by coordination with lanthanide ions, and hierarchical NSC-SA hybrid films were obtained upon drying. Two species of lanthanide ions (Gd3+ and Yb3+) were used to fabricate the hierarchical NSC-SA hybrid films. The as-prepared NSC-SA hybrid films exhibit high tensile strength and stability. The tensile strength and toughness of as-prepared hybrid films reach 122.10MPa and 3.89MJm-3, respectively. Meanwhile, the well-aligned lamellar microstructures also exhibit a good light transmittance. The highest light transmittance reaches 92% for NSC-SA hybrid films at 760nm. This fabrication method for hierarchical NSC-SA hybrid films is innovative due to the utilization of rare earth coordination bonding, and can serve as the basic strategy for the construction of high-performance composites in the near future.
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Affiliation(s)
- Shunli Liu
- School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province, 211189, China
| | - Kewen Li
- School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province, 211189, China
| | - Fang Yao
- School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province, 211189, China
| | - Liqun Xu
- Institute for Clean Energy and Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China
| | - Guodong Fu
- School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province, 211189, China.
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29
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Affiliation(s)
- Hongjiao Wang
- School of Chemistry and Chemical Engineering; Southeast University; Jiangning District Nanjing, Jiangsu Province 211189 People's Republic of China
| | - Shunli Liu
- School of Chemistry and Chemical Engineering; Southeast University; Jiangning District Nanjing, Jiangsu Province 211189 People's Republic of China
| | - Aokai Zhang
- School of Chemistry and Chemical Engineering; Southeast University; Jiangning District Nanjing, Jiangsu Province 211189 People's Republic of China
| | - Kewen Li
- School of Chemistry and Chemical Engineering; Southeast University; Jiangning District Nanjing, Jiangsu Province 211189 People's Republic of China
| | - Olayinka Oderinde
- School of Chemistry and Chemical Engineering; Southeast University; Jiangning District Nanjing, Jiangsu Province 211189 People's Republic of China
| | - Fang Yao
- School of Chemistry and Chemical Engineering; Southeast University; Jiangning District Nanjing, Jiangsu Province 211189 People's Republic of China
| | - Guodong Fu
- School of Chemistry and Chemical Engineering; Southeast University; Jiangning District Nanjing, Jiangsu Province 211189 People's Republic of China
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30
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Li KW, Wang LM, Zhang R, Wang ZB. Modulation axis performs circular motion in a 45° dual-drive symmetric photoelastic modulator. Rev Sci Instrum 2016; 87:123103. [PMID: 28040977 DOI: 10.1063/1.4971302] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A 45° dual-drive symmetric photoelastic modulator is demonstrated. Two piezoelectric actuators are connected to a symmetric photoelastic crystal at an angle of 45°. When the amplitudes of the stress standing waves induced by the two piezoelectric actuators are equal and the phase difference between the two stress standing waves is π2, the modulation axis performs circular motion with a frequency of half of the photoelastic modulator's resonant frequency, while the retardation remains a constant that is determined at the driving voltage amplitudes. This reveals a new polarization modulation method. We have theoretically analyzed and experimentally observed the new polarization modulation, and the retardation calibration is also reported.
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Affiliation(s)
- K W Li
- School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
| | - L M Wang
- School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
| | - R Zhang
- School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
| | - Z B Wang
- School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
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31
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Liu S, Kang M, Hussain I, Li K, Yao F, Fu G. High mechanical strength and stability of alginate hydrogel induced by neodymium ions coordination. Polym Degrad Stab 2016. [DOI: 10.1016/j.polymdegradstab.2016.07.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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32
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Sun Z, Liu S, Li K, Tan L, Cen L, Fu G. Well-defined and biocompatible hydrogels with toughening and reversible photoresponsive properties. Soft Matter 2016; 12:2192-2199. [PMID: 26744299 DOI: 10.1039/c5sm02129d] [Citation(s) in RCA: 12] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In the present study, novel hydrogels with extremely high strength, reversible photoresponsive and excellent biocompatible properties were prepared. The functional hydrogels were synthesized from a well-defined poly (ethylene glycol) polymer with spiropyran groups at a given position (PEG-SP) via a Cu(i)-catalyst Azide-Alkyne Cycloaddition (CuAAC) reaction. The molecular structures of the sequential intermediates for PEG-SP hydrogel preparation were verified by (1)HNMR and FT-IR. The mechanical property, swelling ratio, compression strength, surface hydrophilicity, and biocompatibility of the resulting hydrogel were characterized. Since spiropyran is pivotal to the switch in hydrophilicity on the hydrogel surface, the swelling ratio of PEG-SP hydrogel under Vis irradiation has a major decrease (155%). Before and after UV light irradiation, the contact angle of the hydrogel has a change of 13.8°. The photoresponsive property of this hydrogel was thus demonstrated, and such a property was also shown to be reversible. The well-defined PEG-SP hydrogel can also sustain a compressive stress of 49.8 MPa without any macro- or micro-damage, indicating its outstanding mechanical performance. Furthermore, it possessed excellent biocompatibility as demonstrated by its performance in an in vivo porcine subcutaneous implantation environment. No inflammation was observed and it got along well with the adjacent tissue. The above features indicate that PEG-SP hydrogels are promising as an implantable matrix for potential applications in biomaterial.
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Affiliation(s)
- Zhiqiang Sun
- School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province 211189, P. R. China.
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Abstract
A layered alginate-based biopolymer paper with a hierarchical structure and excellent mechanical properties was prepared via lanthanide ions coordination.
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Affiliation(s)
- Shunli Liu
- School of Chemistry and Chemical Engineering Southeast University
- Nanjing
- P.R. China 211189
| | - Jun Ling
- School of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China 310027
| | - Kewen Li
- School of Chemistry and Chemical Engineering Southeast University
- Nanjing
- P.R. China 211189
| | - Fang Yao
- School of Chemistry and Chemical Engineering Southeast University
- Nanjing
- P.R. China 211189
| | - Olayinka Oderinde
- School of Chemistry and Chemical Engineering Southeast University
- Nanjing
- P.R. China 211189
| | - Zhihong Zhang
- Henan Provincial Key Laboratory of Surface and Interface Science
- Zhengzhou University of Light Industry
- Zhengzhou 450001
- China
| | - Guodong Fu
- School of Chemistry and Chemical Engineering Southeast University
- Nanjing
- P.R. China 211189
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Omrani A, van der Vaart T, Mientjes E, van Woerden GM, Hojjati MR, Li KW, Gutmann DH, Levelt CN, Smit AB, Silva AJ, Kushner SA, Elgersma Y. HCN channels are a novel therapeutic target for cognitive dysfunction in Neurofibromatosis type 1. Mol Psychiatry 2015; 20:1311-21. [PMID: 25917366 PMCID: PMC5603719 DOI: 10.1038/mp.2015.48] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 02/19/2015] [Accepted: 03/09/2015] [Indexed: 12/27/2022]
Abstract
Cognitive impairments are a major clinical feature of the common neurogenetic disease neurofibromatosis type 1 (NF1). Previous studies have demonstrated that increased neuronal inhibition underlies the learning deficits in NF1, however, the molecular mechanism underlying this cell-type specificity has remained unknown. Here, we identify an interneuron-specific attenuation of hyperpolarization-activated cyclic nucleotide-gated (HCN) current as the cause for increased inhibition in Nf1 mutants. Mechanistically, we demonstrate that HCN1 is a novel NF1-interacting protein for which loss of NF1 results in a concomitant increase of interneuron excitability. Furthermore, the HCN channel agonist lamotrigine rescued the electrophysiological and cognitive deficits in two independent Nf1 mouse models, thereby establishing the importance of HCN channel dysfunction in NF1. Together, our results provide detailed mechanistic insights into the pathophysiology of NF1-associated cognitive defects, and identify a novel target for clinical drug development.
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Affiliation(s)
- A Omrani
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
| | - T van der Vaart
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands,Department of Pediatrics, Erasmus Medical Center, Sophia Children’s Hospital, Rotterdam, The Netherlands
| | - E Mientjes
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
| | - GM van Woerden
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
| | - MR Hojjati
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,Department of Physiology, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - KW Li
- Department of Molecular and Cellular Neurobiology, CNCR, Neuroscience Campus Amsterdam, VU University, Amsterdam, The Netherlands
| | - DH Gutmann
- Department of Neurology, Washington University School of Medicine, St. Louis, MO, USA
| | - CN Levelt
- Department of Molecular Visual Plasticity, Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, The Netherlands
| | - AB Smit
- Department of Molecular and Cellular Neurobiology, CNCR, Neuroscience Campus Amsterdam, VU University, Amsterdam, The Netherlands
| | - AJ Silva
- Department of Neurobiology, Brain Research Institute, University of California Los Angeles, Los Angeles, CA, USA
| | - SA Kushner
- ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands,Department of Psychiatry, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Y Elgersma
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
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Abstract
Spontaneous imbibition happens in many natural and chemical engineering processes in which the mean advancing front usually follows Lucas-Washburn’s law. However it has been found that the scaling law does not apply in many cases. There have been few criteria to determine under what conditions the Washburn law works. The effect of gravity on spontaneous imbibition in porous media was investigated both theoretically and experimentally. The mathematical model derived analytically was used to calculate the imbibition rates in porous media with different permeabilities. The results demonstrated that the effect of gravity on spontaneous imbibition was governed by the hydraulic conductivity of the porous media (permeability of the imbibition systems). The criteria for applying the Lucas-Washburn law have been proposed. The effect of gravity becomes more apparent with the increase in permeability or with the decrease in CGR number (the ratio of capillary pressure to gravity forces) and may be ignored when the CGR number is less than a specific value ≅ 3.0. The effect of gravity on imbibition in porous media can be modeled theoretically. It may not be necessary to conduct spontaneous imbibition experiments horizontally in order to exclude the effect of gravity, as has been done previously.
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Affiliation(s)
- Kewen Li
- China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China.,Stanford University, 367 Panama St., CA 94305, USA
| | - Danfeng Zhang
- China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
| | - Huiyuan Bian
- China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
| | - Chao Meng
- China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
| | - Yanan Yang
- China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
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Holmes WE, Angel TE, Li KW, Hellerstein MK. Dynamic Proteomics: In Vivo Proteome-Wide Measurement of Protein Kinetics Using Metabolic Labeling. Methods Enzymol 2015; 561:219-76. [PMID: 26358907 DOI: 10.1016/bs.mie.2015.05.018] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Control of biosynthetic and catabolic rates of polymers, including proteins, stands at the center of phenotype, physiologic adaptation, and disease pathogenesis. Advances in stable isotope-labeling concepts and mass spectrometric instrumentation now allow accurate in vivo measurement of protein synthesis and turnover rates, both for targeted proteins and for unbiased screening across the proteome. We describe here the underlying principles and operational protocols for measuring protein dynamics, focusing on metabolic labeling with (2)H2O (heavy water) combined with tandem mass spectrometric analysis of mass isotopomer abundances in trypsin-generated peptides. The core principles of combinatorial analysis (mass isotopomer distribution analysis or MIDA) are reviewed in detail, including practical advantages, limitations, and technical procedures to ensure optimal kinetic results. Technical factors include heavy water labeling protocols, optimal duration of labeling, clean up and simplification of sample matrices, accurate quantitation of mass isotopomer abundances in peptides, criteria for adequacy of mass spectrometric abundance measurements, and calculation algorithms. Some applications are described, including the noninvasive "virtual biopsy" strategy for measuring molecular flux rates in tissues through measurements in body fluids. In addition, application of heavy water labeling to measure flux lipidomics is noted. In summary, the combination of stable isotope labeling, particularly from (2)H2O, with tandem mass spectrometric analysis of mass isotopomer abundances in peptides, provides a powerful approach for characterizing the dynamics of proteins across the global proteome. Many applications in research and clinical medicine have been achieved and many others can be envisioned.
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Affiliation(s)
- W E Holmes
- KineMed Inc., Emeryville, California, USA
| | - T E Angel
- KineMed Inc., Emeryville, California, USA
| | - K W Li
- KineMed Inc., Emeryville, California, USA
| | - M K Hellerstein
- KineMed Inc., Emeryville, California, USA; Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, California, USA.
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Giniatullina A, Maroteaux G, Geerts CJ, Koopmans B, Loos M, Klaassen R, Chen N, van der Schors RC, van Nierop P, Li KW, de Jong J, Altrock WD, Cornelisse LN, Toonen RF, van der Sluis S, Sullivan PF, Stiedl O, Posthuma D, Smit AB, Groffen AJ, Verhage M. Functional characterization of the PCLO p.Ser4814Ala variant associated with major depressive disorder reveals cellular but not behavioral differences. Neuroscience 2015; 300:518-38. [PMID: 26045179 DOI: 10.1016/j.neuroscience.2015.05.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [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: 11/28/2014] [Revised: 05/17/2015] [Accepted: 05/20/2015] [Indexed: 12/14/2022]
Abstract
Genome-wide association studies have suggested a role for a genetic variation in the presynaptic gene PCLO in major depressive disorder (MDD). As with many complex traits, the PCLO variant has a small contribution to the overall heritability and the association does not always replicate. One variant (rs2522833, p.Ser4814Ala) is of particular interest given that it is a common, nonsynonymous exon variant near a calcium-sensing part of PCLO. It has been suggested that the molecular effects of such variations penetrate to a variable extent in the population due to phenotypic and genotypic heterogeneity at the population level. More robust effects may be exposed by studying such variations in isolation, in a more homogeneous context. We tested this idea by modeling PCLO variation in a mouse knock-in model expressing the Pclo(SA)(/)(SA) variant. In the highly homogeneous background of inbred mice, two functional effects of the SA-variation were observed at the cellular level: increased synaptic Piccolo levels, and 30% increased excitatory synaptic transmission in cultured neurons. Other aspects of Piccolo function were unaltered: calcium-dependent phospholipid binding, synapse formation in vitro, and synaptic accumulation of synaptic vesicles. Moreover, anxiety, cognition and depressive-like behavior were normal in Pclo(SA)(/)(SA) mice. We conclude that the PCLO p.Ser4814Ala missense variant produces mild cellular phenotypes, which do not translate into behavioral phenotypes. We propose a model explaining how (subtle) cellular phenotypes do not penetrate to the mouse behavioral level but, due to genetic and phenotypic heterogeneity and non-linearity, can produce association signals in human population studies.
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Affiliation(s)
- A Giniatullina
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - G Maroteaux
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - C J Geerts
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - B Koopmans
- Sylics (Synaptologics BV), Amsterdam, The Netherlands
| | - M Loos
- Sylics (Synaptologics BV), Amsterdam, The Netherlands
| | - R Klaassen
- Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - N Chen
- Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - R C van der Schors
- Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - P van Nierop
- Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - K W Li
- Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - J de Jong
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - W D Altrock
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - L N Cornelisse
- Department of Clinical Genetics, Section Complex Trait Genetics, VU University Medical Center, Amsterdam, The Netherlands
| | - R F Toonen
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - S van der Sluis
- Department of Clinical Genetics, Section Complex Trait Genetics, VU University Medical Center, Amsterdam, The Netherlands
| | - P F Sullivan
- Department of Genetics, University of North Carolina, Chapel Hill, NC, USA; Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - O Stiedl
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands; Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - D Posthuma
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands; Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - A B Smit
- Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands
| | - A J Groffen
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - M Verhage
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University Amsterdam, The Netherlands; Department of Clinical Genetics, Section Complex Trait Genetics, VU University Medical Center, Amsterdam, The Netherlands.
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van Kleeff PJM, Jaspert N, Li KW, Rauch S, Oecking C, de Boer AH. Higher order Arabidopsis 14-3-3 mutants show 14-3-3 involvement in primary root growth both under control and abiotic stress conditions. J Exp Bot 2014; 65:5877-88. [PMID: 25189593 PMCID: PMC4203132 DOI: 10.1093/jxb/eru338] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Arabidopsis 14-3-3 proteins are a family of conserved proteins that interact with numerous partner proteins in a phospho-specific manner, and can affect the target proteins in a number of ways; e.g. modification of enzymatic activity. We isolated T-DNA insertion lines in six 14-3-3 genes within the non-epsilon group that phylogenetically group in three closely related gene pairs. In total, 6 single, 3 double, 12 triple, and 3 quadruple mutants were generated. The mutants were phenotyped for primary root growth on control plates: single and double mutants were indistinguishable from WT, whereas six triples and all quadruples showed a shorter primary root. In addition, length of the first epidermal cell with a visible root hair bulge (LEH) was used to determine primary root elongation on medium containing mannitol and 1-aminocyclopropane-1-carboxylic acid (ACC). This analysis showed clear differences depending on the stress and 14-3-3 gene combinations. Next to the phenotypic growth analyses, a 14-3-3 pull-down assay on roots treated with and without mannitol showed that mannitol stress strongly affects the 14-3-3 interactome. In conclusion, we show gene specificity and functional redundancy among 14-3-3 proteins in primary root elongation under control and under abiotic stress conditions and changes in the 14-3-3 interactome during the onset of stress adaptation.
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Affiliation(s)
- P J M van Kleeff
- Faculty of Earth and Life Sciences, Department of Structural Biology, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
| | - N Jaspert
- Centre for Plant Molecular Biology-Plant Physiology, University of Tübingen, Auf der Morgenstelle 32, 72076 Tübingen, Germany
| | - K W Li
- Faculty of Earth and Life Sciences, Department of Molecular and Cellular Neurobiology, Centre for Neurogenomics and Cognitive Research (CNCR), Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
| | - S Rauch
- Centre for Plant Molecular Biology-Plant Physiology, University of Tübingen, Auf der Morgenstelle 32, 72076 Tübingen, Germany
| | - C Oecking
- Centre for Plant Molecular Biology-Plant Physiology, University of Tübingen, Auf der Morgenstelle 32, 72076 Tübingen, Germany
| | - A H de Boer
- Faculty of Earth and Life Sciences, Department of Structural Biology, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
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Li K, Hou B, Wang L, Cui Y. Application of carbon nanocatalysts in upgrading heavy crude oil assisted with microwave heating. Nano Lett 2014; 14:3002-3008. [PMID: 24787900 DOI: 10.1021/nl500484d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Heavy crude oil can be upgraded to lighter oil using several techniques. However, current methods usually require high temperatures, long reaction duration, and cause serious environmental pollution. This study shows that by using carbon nanocatalysts, heavy crude oil can be efficiently upgraded to lighter oil at a relatively low temperature of about 150 °C. The temperature of crude oil was increased by microwave heating. The technique proposed in this study has the following advantages: (1) great viscosity reduction ratio over 96%, (2) short reaction time (less than 1 h), (3) low required temperature, and (4) long viscosity regression time. Because of these advantages, upgrading heavy crude oil to light oil can be cheaper and more environment-friendly.
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Affiliation(s)
- Kewen Li
- School of Energy Resources, China University of Geosciences , Beijing 100083, China
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Yau CH, Choi KY, Kwong NS, Lau PC, Yuen MK, Kwok NC, Chow YY, Siu SLY, Li KW, Lam DK. Frequency of developmental dysplasia of the hip in breech-presented Chinese neonates in Hong Kong. Hong Kong Med J 2012; 18:407-411. [PMID: 23018068] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023] Open
Abstract
OBJECTIVES. To clarify the use of ultrasonography by determining the frequency of developmental dysplasia of the hip among breech-presented Chinese neonates in Hong Kong. DESIGN. Prospective case series. SETTING. Regional hospital, Hong Kong. PATIENTS. All breech-presented Chinese neonates born during January 2008 to June 2009 were included (except premature neonates). They were examined clinically from birth till the age of 1 year. Ultrasound of the hips was performed at the age of 2 weeks, and X-ray of the pelvis at the age of 1 year. RESULTS. A total of 209 breech-presented neonates were born during the study period; 110 neonates completed all necessary investigations and follow-up. Among the latter, there were three neonates with developmental dysplasia of the hip warranting treatment, which amounted to a frequency of 2.7%. CONCLUSION. Developmental dysplasia of the hip among breech-presented Chinese babies is only slightly less common than in corresponding populations in other regions in the world. Since early diagnosis is important, ultrasonography screening in high-risk cases such as those with breech presentation may be useful.
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Affiliation(s)
- C H Yau
- Department of Orthopaedics and Traumatology, Tuen Mun Hospital, Tuen Mun, Hong Kong
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Tang TS, Prior SL, Li KW, Ireland HA, Bain SC, Hurel SJ, Cooper JA, Humphries SE, Stephens JW. Association between the rs1050450 glutathione peroxidase-1 (C > T) gene variant and peripheral neuropathy in two independent samples of subjects with diabetes mellitus. Nutr Metab Cardiovasc Dis 2012; 22:417-425. [PMID: 21185702 DOI: 10.1016/j.numecd.2010.08.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Revised: 06/02/2010] [Accepted: 08/02/2010] [Indexed: 12/14/2022]
Abstract
Glutathione peroxidase-1 (GPx-1) is an endogenous anti-oxidant enzyme. The T allele of the GPx-1 rs1050450 (C > T) gene variant is associated with reduced enzyme activity. Our aim was to examine the association between this gene variant and peripheral neuropathy in two cross-sectional samples of subjects with diabetes: (i) 773 Caucasian subjects were genotyped from the UCL Diabetes and Cardiovascular disease Study (UDACS) and (ii) 382 Caucasian subjects from the Ealing Diabetes Study (EDS). Peripheral neuropathy status (and oxidised-LDL [Ox-LDL:LDL] and plasma Total Ant-ioxidant Status [TAOS] in UDACS), were analysed in relation to genotype. We observed that: (i) In UDACS, the odds ratio (OR) for peripheral neuropathy in the T allele carriers compared to the CC genotype was 1.61 [1.10-2.28], p = 0.01. This remained significant after adjustment for other risk factors. Ox-LDL:LDL ratio was significantly elevated in T allele carriers (CC vs. CT/TT: 16.3 ± 2.4 v 18.0 ± 2.9 U/mmol LDL, p = 0.02). (ii) In EDS, the OR for peripheral neuropathy in the T allele carriers compared to the CC genotype was 1.95 [1.11-3.42], p = 0.02. This remained significant after adjustment for other risk factors. In conclusion, we observed a significant association between the T allele and peripheral neuropathy and LDL oxidation. This is the first paper to examine the rs1050450 variant in two samples of Caucasian subjects with diabetes. Prospective analysis of the gene variant is required in diabetic and healthy cohorts with measured plasma markers of oxidative stress to investigate the described association further.
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Affiliation(s)
- T S Tang
- Diabetes Research Group, Institute of Life Sciences, Swansea University, Swansea SA2 8PP, UK
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Liao X, Li K, Xiang X, Wang SG, She X, Zhu Y, Li Y. Mediatory role of K, Cu and Mo over Ru/SiO2 catalysts for glycerol hydrogenolysis. J IND ENG CHEM 2012. [DOI: 10.1016/j.jiec.2011.10.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Li K, Guan Y. Effective-Well Method for Matching and Predicting Oil Production. Transp Porous Media 2012. [DOI: 10.1007/s11242-011-9850-6] [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: 10/17/2022]
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Li K. More general capillary pressure and relative permeability models from fractal geometry. J Contam Hydrol 2010; 111:13-24. [PMID: 19923036 DOI: 10.1016/j.jconhyd.2009.10.005] [Citation(s) in RCA: 9] [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] [Received: 10/10/2008] [Revised: 10/13/2009] [Accepted: 10/23/2009] [Indexed: 05/28/2023]
Abstract
More general capillary pressure and relative permeability models were derived theoretically from fractal modeling of a porous medium. It was found that the new capillary pressure model could be reduced to the frequently-used Brooks-Corey capillary pressure model and the Li-Horne imbibition model when the fractal dimension of a porous medium takes specific values. This also demonstrates that the Brooks-Corey model and the Li-Horne model have a further confirmed theoretical basis. Capillary pressure data measured using mercury intrusion techinque were used to verify the model. The results demonstrated that the new capillary pressure model could represent the capillary pressure curves in those rocks with fracures or with great heterogeneity while the existing models cannot. The new relative permeability models can be reduced to the Brooks-Corey relative permeability model in a specific case. It has been proved theoretically that the relative permeability of each phase in a smooth fracture is only a linear function of its own saturation. Relative permeability data were calculated using the new models and the model results were compared with experimental data measured using a steady-state technique. The comparison demonstrated that the relative permeability models and experimental results were consistent with each other.
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Klemmer P, Smit AB, Li KW. Proteomics analysis of immuno-precipitated synaptic protein complexes. J Proteomics 2008; 72:82-90. [PMID: 19022416 DOI: 10.1016/j.jprot.2008.10.005] [Citation(s) in RCA: 42] [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] [Received: 07/02/2008] [Revised: 10/21/2008] [Accepted: 10/23/2008] [Indexed: 11/18/2022]
Abstract
Synapses are key neuronal elements of the brain. They are responsible for transmission, integration, and storage of information between nerve cells. A synapse is considered as the most complex cellular organelle consisting of approximately 1500 of proteins that are interacting in an activity dependent manner. We have initiated a series of immuno-precipitation experiments in conjunction with LC-MS/MS analysis in order to gain better insight into the organization of the synapse. In particular, we focused on proteins that have been implicated previously in the process of neuroplasticity, i.e., the glutamate receptor (GluR2), scaffolding proteins (PSD-95 and CASK), voltage gated potassium (KCNQ2 and Kv4.2) and calcium (CaV beta4) channel subunits, the signalling protein (GIT1) and synaptic vesicle protein (synaptophysin). This study confirms the previous reported protein-protein interactions and furthermore detects novel interactors. In conjunction with the literature reported protein-protein interaction a simple synaptic protein interactome was constructed. This model implicates the potential interaction of distinct protein complexes, and the engagement of single proteins, especially the scaffolding proteins, in multiple protein complexes.
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Affiliation(s)
- P Klemmer
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, VU University Amsterdam,De Boelelaan 1085, 1081 Amsterdam, The Netherlands
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Lo GG, Ai V, Au-Yeung KM, Chan JKF, Li KW, Chien D. Magnetic resonance whole body imaging at 3 Tesla: feasibility and findings in a cohort of asymptomatic medical doctors. Hong Kong Med J 2008; 14:90-96. [PMID: 18382014] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023] Open
Abstract
OBJECTIVES To evaluate the feasibility of whole body imaging using a 3 Tesla magnetic resonance scanner without a contrast agent, and to study the prevalence of abnormal findings among a cohort of asymptomatic doctors. DESIGN Prospective study. SETTING Private hospital, Hong Kong. PARTICIPANTS A total of 132 asymptomatic medical doctors (111 men, 21 women), with a mean age of 56 (range, 38-82) years, volunteered for the study. They underwent corresponding whole body imaging at our hospital between October 2005 and February 2006. Imaging involved a 3 Tesla magnetic resonance scanner with 32 channels, parallel imaging, Total Imaging Matrix technology, a maximum gradient amplitude of 40 mT/m and a slew rate of 200 mT/m/ms (Magnetom Tim Trio, Siemens Medical Solution, Erlangen, Germany). The use of matrix coils enabled coverage of the whole body. No contrast agent was used. MAIN OUTCOME MEASURES Detection of abnormalities in asymptomatic, apparently healthy adults. RESULTS All examinations were completed successfully. The mean scan time per subject was 33 (standard deviation, 4) minutes. All subjects tolerated the examination well and overall imaging quality was satisfactory. A total of 124 (94%) subjects had positive findings, of whom 24 (18%) had further workup. Five (4%) subjects were found to have tumours, of which two (1.5%) were proven malignant. Our cancer detection rate was comparable to that of other reported whole body screening studies using contrast magnetic resonance imaging and positron emission tomography. CONCLUSION We demonstrated the feasibility of performing whole body imaging in 30 minutes, using 32-channel magnetic resonance imaging at 3 Tesla without a contrast agent or any ionising radiation.
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Affiliation(s)
- Gladys G Lo
- Department of Diagnostic Radiology, Hong Kong Sanatorium and Hospital, 2 Village Road, Happy Valley, Hong Kong.
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