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Seroprevalence of Toxoplasma gondii Infection among HIV/AIDS Patients in Eastern China
Guoqiang Shen,Xiaoming Wang,Hui Sun,Yaying Gao 대한기생충학열대의학회 2016 The Korean Journal of Parasitology Vol.54 No.1
Toxoplasmosis, a neglected tropical disease caused by the protozoan parasite Toxoplasma gondii, occurs throughout the world. Human T. gondii infection is asymptomatic in 80% of the population; however, the infection is life-threatening and causes substantial neurologic damage in immunocompromised patients such as HIV-infected persons. The major purpose of this study was to investigate the seroprevalence of T. gondii infection in subjects infected with HIV/AIDS in eastern China. Our findings showed 9.7% prevalence of anti-T. gondii IgG antibody in HIV/AIDS patients, which was higher than in intravenous drug users (2.2%) and healthy controls (4.7%), while no significant difference was observed in the seroprevalence of anti-Toxoplasma IgM antibody among all participants (P>0.05). Among all HIV/AIDS patients, 15 men (7.7%) and 10 women (15.9%) were positive for anti-T. gondii IgG antibody; however, no significant difference was detected in the seroprevalence of anti-Toxoplasma IgG antibody between males and females. The frequency of anti-Toxoplasma IgG antibody was 8.0%, 13.2%, 5.5%, and 0% in patients with normal immune function (CD4<SUP>+</SUP> T-lymphocyte count ≥500 cells/ml), immunocompromised patients (cell count ≥200 and <500 cells/ml), severely immunocompromised patients (cell count ≥50 and <200 cells/ml), and advanced AIDS patients, respectively (cell count <50 cells/ml), while only 3 immunocompromised patients were positive for anti-T. gondii IgM antibody. The results indicate a high seroprevalence of T. gondii infection in HIV/AIDS patients in eastern China, and a preventive therapy for toxoplasmosis may be given to HIV/AIDS patients based on CD4<SUP>+</SUP> T lymphocyte count.
Lingfang Sun,Yida Zang,Xiuyu Zhang,Guoqiang Zhu,Cheng Zhong,Chenliang Wang 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.3
An adaptive dynamic surface control (DSC) scheme using event triggering mechanism and barrier Lyapunov function (BLF) to constraint state variables and solve energy saving issues is proposed for multi-agent systems (MASs). Furthermore, invented a control algorithm that uses the event-triggered mechanism for not only decrease the number of information exchanges between agents significantly but also decreased utilization of electricityand communication expenses in the control process. DSC and full-state constraints are used to solve the “complexityexplosion” problem of the traditional back-stepping method. Simulation and semi-physical experimental platformswere constructed to verify the proposed algorithm is valid.
Structural Shear Wall Systems with Metal Energy Dissipation Mechanism
Li, Guoqiang,Sun, Feifei,Pang, Mengde,Liu, Wenyang,Wang, Haijiang Council on Tall Building and Urban Habitat Korea 2016 International journal of high-rise buildings Vol.5 No.3
Shear wall structures have been widely used in high-rise buildings during the past decades, mainly due to their good overall performance, large lateral stiffness, and high load-carrying capacity. However, traditional reinforced concrete wall structures are prone to brittle failure under seismic actions. In order to improve the seismic behavior of traditional shear walls, this paper presents three different metal energy-dissipation shear wall systems, including coupled shear wall with energy-dissipating steel link beams, frame with buckling-restrained steel plate shear wall structure, and coupled shear wall with buckling-restrained steel plate shear wall. Constructional details, experimental studies, and calculation analyses are also introduced in this paper.
Workspace and Structural Parameter Analysis for a Novel 3-PRS Parallel Mechanism
Fuwei Sun,Junwei Zhao,Guoqiang Chen 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.12
The working space is one of the important indexes to measure the working capability of parallel mechanism. In this paper, the working space of a new type of 3-PRS parallel mechanism is studied. In the beginning, a novel 3-PRS parallel mechanism is proposed with the kinematics analyzed, and then the working space and volume are obtained by search algorithm, and the working space is drawn using MATLAB. Finally, the influence of the structural parameters on the working space is discussed, which provide theoretical basis for parameter optimization.
Yang Guoqiang,Guo Gang,Wang Lihui,Wang Changchang,Sun Tao 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.3
In this paper, wet shotcrete spraying experiments were carried out under different temperature and humidity conditions withdifferent dosage of metakaolin (MK) and different length of polyvinyl alcohol fiber (PVA fiber). And the influence of differentcontent of metakaolin and different length of PVA fiber on the compressive strength of tidal shotcrete under different curingconditions was explored. The results show that the compressive strength of shotcrete increases first and then decreases withthe increase of MK content and PVA fiber length under the curing condition of normal temperature and constant humidity. However, under the curing condition of high temperature and humidity, the compressive strength of shotcrete tended toincrease with the increase of MK content. Under the condition of high temperature and high humidity curing, the compressivestrength of shotcrete is lower than that of shotcrete under normal temperature and constant humidity curing. This study canprovide theoretical support for the application of sprayed concrete in different environments.
Study on electromechanical performance of steering of the electric articulated tracked vehicles
Jiaqi Wu,Guoqiang Wang,Huanyu Zhao,Kangkang Sun 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7
Articulated tracked vehicles (ATVs) usually use hydraulic drive or mechanical drive modes. Electrically driven tracked vehicles have become a promising development direction for saving energy and meeting the environment requirements. In this study, based on the mechanical motion equation and the dynamic ATV equation, the electromechanical coupling model of the track vehicles is established by coupling the motor equation. The typical mechanical and electrical parameters in the ATV steering process are measured and compared with the numerical results to verify the correctness of the electromechanical coupling model. Experimental results indicate the main mechanical and electrical parameters of the ATV electro-mechanical system are changed at different articulated point deflection angles. The characteristic parameters of ATV include the change in current and voltage, the size of trajectory radius and the change of power under different deflection angles (10°, 15°, 20°, 25° and 30°), all of which are of great significance for the control of ATV. The current and voltage signals of ATV under specific trajectory can be calculated in reverse by the model, thereby providing a theoretical basis for the trajectory control of articulated vehicles. Therefore, this study provides a reference for the theoretical analysis of electromechanical performance, road driving performance and vehicle design of the electric ATV.
The reliability assessment of human systems interaction for aircraft carrier landing
Jianyu Zhao,Guoqiang Sun,Shengkui Zeng,Jianbin Guo,Guo Zhou 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10
The accidents of many share-control engineering application, including the aircraft carrier-landing process, are directly related to human error. In order to identify human error and assess the reliability of Human system interaction (HSI) in carrier landing, a control theoretic based simulation method is proposed. The simulator combines the pilot control with the cognition model that exploits the human error mechanism to describe the dynamic characteristics of carrier-landing. And the Performance shaping factors (PSFs) are also taken into consideration to represent the likelihood of human error. Moreover, the mission reliability is proposed as an appropriate metric of HSI. By quantitative simulation, the human error produced in HSI could be presented and demonstrated dynamically. The performance of the proposed method is tested through a case study.
Deyu Xu,Jing Zhao,Guoqiang Cao,Jinyu Wang,Qinggang Li,Ping Zheng,Shuxin Zhao,Jibin Sun 한국생물공학회 2018 Biotechnology and Bioprocess Engineering Vol.23 No.1
Phosphoenolpyruvate carboxylase (PEPC) catalyzes the carboxylation of phosphoenolpyruvate (PEP) in the presence of bicarbonate to form oxaloacetate (OAA), and it plays an important role in high-efficient production of OAA-derived metabolites such as lysine, glutamate and succinate. However, PEPCs often suffered from serious feedback inhibition by various metabolic effectors like aspartate. Here, the feedback inhibition of PEPC from Corynebacterium glutamicum was removed by adding a short terminal peptide like His-tag. The effect of His-tag location on the structure and important properties such as activity, thermostability and feedback inhibition of PEPC has been investigated. The purified untagged PEPC, Nterminal His-tagged PEPC (PEPC-N-His) and C-terminal His-tagged PEPC (PEPC-C-His) were characterized. PEPCN- His (439.71/sec/mM) showed a 1.26 and 186-fold higher catalytic efficiency than untagged PEPC (348.59/sec/mM) and PEPC-C-His (2.36/sec/mM), respectively. Both PEPCN- His and untagged PEPC were significantly inhibited by aspartate at the concentrations above 4 mM (residual activities < 10%), while PEPC-C-His was almost desensitized to aspartate within 10 mM (around 90% of residual activity). Structural analysis showed that the extension of C-terminus may cause steric hindrance for aspartate binding with enzymes, leading to the deregulation of feedback inhibition of PEPC-C-His. This study provides a deeper understanding of the effect of terminal fragments on the structure and function of PEPCs, and helps to engineer the feedback inhibition of PEPCs and structurally similar enzymes.
Long noncoding RNA: multiple players in gene expression
( Xiaochang Chen ),( Yunmei Sun ),( Rui Cai ),( Guoqiang Wang ),( Xiaoyan Shu ),( Weijun Pang ) 생화학분자생물학회 2018 BMB Reports Vol.51 No.6
Previously considered as a component of transcriptional noise, long noncoding RNAs (lncRNAs) were neglected as a therapeutic target, however, recently increasing evidence has shown that lncRNAs can participate in numerous biological processes involved in genetic regulation including epigenetic, transcriptional, and post-transcriptional regulation. In this review, we discuss the fundamental functions of lncRNAs at different regulatory levels and their roles in metabolic balance. Typical examples are introduced to illustrate their diverse molecular mechanisms. The comprehensive investigation and identification of key lncRNAs will not only contribute to insights into diseases, such as breast cancer and type II diabetes, but also provide promising therapeutic targets for related diseases. [BMB Reports 2018; 51(6): 280-289]