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Gao K, Yang H, Yang LQ, Hu MQ. [Application of intervertebral foramen endoscopy BEIS technique in the lumbar spine surgery failure syndrome over 60 years old]. Zhongguo Gu Shang 2019; 32:647-652. [PMID: 31382724 DOI: 10.3969/j.issn.1003-0034.2019.07.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To evaluate the mid-term efficacy of radiofrequency ablation of nucleus pulposus by intervertebral foramen endoscopy BEIS technique in the treatment of lumbar spine surgery failure syndrome over 60 years old. METHODS The clinical data of 40 patients over 60 years old with lumbar spine surgery failure syndrome admitted from January 2010 to January 2015 were retrospectively analyzed. Among them, there were 34 males and 6 females, aged from 60 to 76 years old with an average of 66 years, the courses of disease ranged from 10 months to 4 years. The patients were divided into two groups (BEIS group and revision group) according to the different surgery. The intervertebral foramen endoscopy BEIS technique and the transforaminal lumbar interbody fusion (TLIF) were performed in BEIS group and revision group respectively. There was no significant difference in general data such as sex, age, course of disease, surgical segment between two groups(P>0.05). The operation time, intraoperative bleeding volume, bed rest time after operation and hospitalization time were observed between two groups. At preoperative, postoperative 1 month, 1 year, 3 years, visual analogue scale(VAS) and Japanese Orthopaedic Association Score(JOA) were used to compare the efficacy. RESULTS The operation time, intraoperative bleeding volume, bed rest time after operation and hospitalization time in BEIS group were (60.2±10.3) min, (60.1±4.5) ml, (2.2±1.5) d, (4.04±1.40) d, respectively, which were significantly lower than those of revision group (P<0.05). The VAS and JOA scores of the two groups at different time after operation were significantly improved (P<0.05), and there was statistically significant difference between two groups (P<0.05). CONCLUSIONS Radiofrequency ablation of nucleus pulposus by intervertebral foramen endoscopy BEIS technique is more effective than TLIF revision in the treatment of lumbar spine surgery failure syndrome over 60 years old. It has advantages of shorter operation time, less bleeding, shorter bed rest after operation and hospitalization time, and is worthy of clinical promotion.
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Affiliation(s)
- Kun Gao
- Department of Spinal Surgery, Huangshi Central Hospital of Edonghealthcare, the Affiliated Hospital of Hubei Institute of Technology, Huangshi 435000, Hubei, China
| | - Hao Yang
- Department of Spinal Surgery, Huangshi Central Hospital of Edonghealthcare, the Affiliated Hospital of Hubei Institute of Technology, Huangshi 435000, Hubei, China
| | - Long-Qiu Yang
- Department of Spinal Surgery, Huangshi Central Hospital of Edonghealthcare, the Affiliated Hospital of Hubei Institute of Technology, Huangshi 435000, Hubei, China
| | - Mei-Qin Hu
- Department of Spinal Surgery, Huangshi Central Hospital of Edonghealthcare, the Affiliated Hospital of Hubei Institute of Technology, Huangshi 435000, Hubei, China;
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Gong J, Jiang H, Shu C, Hu MQ, Huang Y, Liu Q, Li RF. Prognostic value of lymphocyte-to-monocyte ratio in ovarian cancer: a meta-analysis. J Ovarian Res 2019; 12:51. [PMID: 31151469 PMCID: PMC6544921 DOI: 10.1186/s13048-019-0527-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 05/22/2019] [Indexed: 02/07/2023] Open
Abstract
INTRODUCTION Prognostic biomarkers are highly needed to properly manage patients with cancer and improve their clinical courses. The relationship between lymphocyte-to-monocyte ratio (LMR) at diagnosis and ovarian cancer prognosis has been extensively studied, but little consensus has been reached regarding its utility as a biomarker of poor outcome. Thus, this study aimed to investigate the potential prognostic value of pretreatment LMR in such patients to shed light on this issue. METHODS We searched the scientific databases of MEDLINE, Embase, Cochrane Library, and WangFang for relevant studies about the inflammatory prognostic factor LMR in ovarian cancer, based on specific inclusion and exclusion criteria. The following parameters were analyzed among others: LMR values and respective cut-offs, patient's overall survival (OS) and progression-free survival (PFS), and clinicopathological features. RESULTS Eight studies, including 2259 patients, were eligible for inclusion in this meta-analysis. We found that low LMR was associated with both poor OS [Hazard ratio (HR): 1.92; 95% confidence interval (CI): 1.58-2.34; p < 0.001] and PFS (HR: 1.70; 95% CI: 1.54-1.88; p < 0.001). Moreover, our findings revealed that low LMR was correlated with high G2/G3 histological grade (OR: 1.67; 95% CI: 1.26-2.20; p < 0.001) and late III-IV FIGO stage tumors (OR: 3.55; 95% CI: 2.68-4.70; p < 0.001), high serum CA-125 level (OR: 2.18; 95% CI: 1.71-2.77; p < 0.001), and presence of malignant ascites (OR: 1.87; 95% CI: 1.11-3.14; p = 0.02) and lymph node metastases (OR: 1.70; 95% CI: 1.13-2.54; p = 0.01). CONCLUSION Pretreatment LMR is a potential prognostic marker of poor outcome in ovarian cancer patients and may thus be important in clinical care and disease control.
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Affiliation(s)
- Jun Gong
- Department of Abdominal and Pelvic Medical Oncology, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Edong Healthcare Group, Hubei Province, Huangshi, People's Republic of China
| | - Hui Jiang
- Department of Urology, Huangshi Central Hospital of Edong Healthcare Group, Hubei Polytechnic University, Huangshi, Hubei, China
| | - Chang Shu
- Department of Abdominal and Pelvic Medical Oncology, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Edong Healthcare Group, Hubei Province, Huangshi, People's Republic of China
| | - Mei-Qin Hu
- Department of Abdominal and Pelvic Medical Oncology, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Edong Healthcare Group, Hubei Province, Huangshi, People's Republic of China
| | - Yan Huang
- Department of Clinical Laboratory, Huangshi Central Hospital of Edong Healthcare Group, Hubei Polytechnic University, Huangshi, Hubei, China
| | - Qin Liu
- Department of Breast surgery, Thyroid surgery, Huangshi Central Hospital of Edong Healthcare Group, Hubei Polytechnic University, Huangshi, Hubei, China
| | - Rong-Feng Li
- Department of Abdominal and Pelvic Medical Oncology, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Edong Healthcare Group, Hubei Province, Huangshi, People's Republic of China. .,Department of Abdominal and Pelvic Medical Oncology, Huangshi Central Hospital, Hubei Polytechnic University, No.141, Tianjin Road, Huangshi, 435000, Hubei, China.
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Zhao YG, Zhang Y, Wang FL, Zhou J, Zhao QM, Zeng XQ, Hu MQ, Jin MC, Zhu Y. Determination of perchlorate from tea leaves using quaternary ammonium modified magnetic carboxyl-carbon nanotubes followed by liquid chromatography-tandem quadrupole mass spectrometry. Talanta 2018; 185:411-418. [PMID: 29759220 DOI: 10.1016/j.talanta.2018.04.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 03/27/2018] [Accepted: 04/01/2018] [Indexed: 10/17/2022]
Abstract
The novel quaternary ammonium modified magnetic carboxyl-carbon nanotubes (QA-Mag-CCNTs) have been synthesised and characterized. QA-Mag-CCNTs were applied in magnetic dispersive solid phase extraction (Mag-dSPE) for preconcentration of perchlorate from tea leaves prior to liquid chromatography-tandem quadrupole mass spectrometry (LC-MS/MS) analysis. The Mag-dSPE procedure for preconcentration of perchlorate succeed in overcoming the flaw (containing target analyte randomly) of commercially available SPE cartridge. Under optimal conditions, the results showed higher extraction efficiency of QA-Mag-CCNTs, with recoveries between 85.2% and 107%. And the satisfactory precision with inter-day and intra-day RSD values were lower than 8.0%. Furthermore, QA-Mag-CCNTs were evaluated for reuse up to 20 times. The limit of quantification (LOQ) for perchlorate was 8.21 ng kg-1. The developed method was successfully applied in tea leaves for food-safety risk monitoring in Zhejiang province, China. The results showed the concentrations of perchlorate in 229 out of 240 collected samples were in the range of 0.082-988 μg kg-1. It was confirmed that QA-Mag-CCNTs were highly effective materials used for preconcentration of perchlorate.
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Affiliation(s)
- Yong-Gang Zhao
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China; Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals of Zhejiang Province, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - Yun Zhang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Feng-Lian Wang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Jian Zhou
- Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals of Zhejiang Province, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - Qi-Ming Zhao
- College of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Xiu-Qiong Zeng
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Mei-Qin Hu
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
| | - Mi-Cong Jin
- Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals of Zhejiang Province, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China.
| | - Yan Zhu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
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Shen HY, Chen ZX, Li ZH, Hu MQ, Dong XY, Xia QH. Controlled synthesis of 2,4,6-trichlorophenol-imprinted amino-functionalized nano-Fe3O4-polymer magnetic composite for highly selective adsorption. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.06.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Zheng LH, Wang CH, Shang SJ, Zhang XY, Wang YS, Wu QH, Hu MQ, Chai ZY, Wu X, Zheng H, Zhang C, Wang LC, Xiong W, Zhou Z. Real-time endocytosis imaging as a rapid assay of ligand-GPCR binding in single cells. Am J Physiol Cell Physiol 2013; 305:C751-60. [DOI: 10.1152/ajpcell.00335.2012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Most G protein-coupled receptors (GPCRs) do not generate membrane currents in response to ligand-receptor binding (LRB). Here, we describe a novel technique using endocytosis as a bioassay that can detect activation of a GPCR in a way analogous to patch-clamp recording of an ion channel in a living cell. The confocal imaging technique, termed FM endocytosis imaging (FEI), can record ligand-GPCR binding with high temporal (second) and spatial (micrometer) resolution. LRB leads to internalization of an endocytic vesicle, which can be labeled by a styryl FM dye and visualized as a fluorescent spot. Distinct from the green fluorescence protein-labeling method, FEI can detect LRB endocytosis mediated by essentially any receptors (GPCRs or receptors of tyrosine kinase) in a native cell/cell line. Three modified versions of FEI permit promising applications in functional GPCR studies and drug screening in living cells: 1) LRB can be recorded in “real time” (time scale of seconds); 2) internalized vesicles mediated by different GPCRs can be discriminated by different colors; and 3) a high throughput method can screen ligands of a specific GPCR.
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Affiliation(s)
- Liang-Hong Zheng
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Chang-He Wang
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Shu-Jiang Shang
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Xiao-Yu Zhang
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Ye-Shi Wang
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Qi-Hui Wu
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Mei-Qin Hu
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Zu-Yin Chai
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Xi Wu
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Hui Zheng
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Chen Zhang
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Lie-Cheng Wang
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Wei Xiong
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Zhuan Zhou
- State Key Laboratory of Biomembrane and Membrane Biotechnology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine and PKU-IDG/McGovern Institute for Brain Research, Institute of Molecular Medicine and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
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Dong ZX, Zhao X, Gu DF, Shi YQ, Zhang J, Hu XX, Hu MQ, Yang BF, Li BX. Comparative effects of liensinine and neferine on the human ether-a-go-go-related gene potassium channel and pharmacological activity analysis. Cell Physiol Biochem 2012; 29:431-42. [PMID: 22508050 DOI: 10.1159/000338497] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/30/2012] [Indexed: 11/19/2022] Open
Abstract
Liensinine and neferine, a kind of isoquinoline alkaloid, can antagonize the ventricular arrhythmias. The human ether-a-go-go-related gene (hERG) is involved in repolarization of cardiac action potential. We investigated the effects of liensinine and neferine on the biophysical properties of hERG channel and the underlying structure-activity relationships. The effects of liensinine and neferine were examined on the hERG channels in the stable transfected HEK293 cells using a whole-cell patch clamp technique, western blot analysis and immunofluorescence experiment. The pharmacokinetics and tissue distribution determination of liensinine and neferine in rats were determined by a validated RP-HPLC method. Liensinine and neferine induced decrease of current amplitude in dose-dependent. Liensinine reduced hERG tail current from 70.3±6.3 pA/pF in control group to 56.7±2.8 pA/pF in the 1 μM group, 53.0±2.3 pA/pF (3 μM) and 17.8±0.7 pA/pF (30 μM); the corresponding current densities of neferine-treated cells were 41.9±3.1 pA/pF, 32.3±3.1 pA/pF and 16.2±0.6 pA/pF, respectively. Neferine had binding affinity for the open and inactivated state of hERG channel, liensinine only bound to the open state. The inhibitory effects of liensinine and neferine on hERG current were attenuated in the F656V or Y652A mutant channels. Neferine distributed more quickly than liensinine in rats, which was found to be in higher concentration than liensinine. Both liensinine and neferine had no effect on the generation and expression of hERG channels. In conclusion, neferine is a more potent blocker of hERG channels than liensinine at low concentration (<10 μM), which may be due to higher hydrophobic nature of neferine compared with liensinine. Neferine may be safety even for long-term treatment as an antiarrhythmic drug.
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Affiliation(s)
- Zeng-Xiang Dong
- Department of Pharmacology, Harbin Medical University, Harbin
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Wang SR, Yao W, Huang HP, Zhang B, Zuo PL, Sun L, Dou HQ, Li Q, Kang XJ, Xu HD, Hu MQ, Jin M, Zhang L, Mu Y, Peng JY, Zhang CX, Ding JP, Li BM, Zhou Z. Role of vesicle pools in action potential pattern-dependent dopamine overflow in rat striatum in vivo. J Neurochem 2011; 119:342-53. [PMID: 21854394 DOI: 10.1111/j.1471-4159.2011.07440.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Action potential (AP) patterns and dopamine (DA) release are known to correlate with rewarding behaviors, but how codes of AP bursts translate into DA release in vivo remains elusive. Here, a given AP pattern was defined by four codes, termed total AP number, frequency, number of AP bursts, and interburst time [N, f, b, i].. The 'burst effect' was calculated by the ratio (γ) of DA overflow by multiple bursts to that of a single burst when total AP number was fixed. By stimulating the medial forebrain bundle using AP codes at either physiological (20 Hz) or supraphysiological (80 Hz) frequencies, we found that DA was released from two kinetically distinct vesicle pools, the fast-releasable pool (FRP) and prolonged-releasable pool (PRP), in striatal dopaminergic terminals in vivo. We examined the effects of vesicle pools on AP-pattern dependent DA overflow and found, with given 'burst codes' [b=8, i=0.5 s], a large total AP number [N = 768, f = 80 Hz] produced a facilitating burst-effect (γ[b8/b1] = 126 ± 3%), while a small total AP number [N=96, 80 Hz] triggered a depressing-burst-effect (γ[b8/b1] = 29 ± 4%). Furthermore, we found that the PRP (but not the FRP) predominantly contributed to the facilitating-burst-effect and the FRP played an important role in the depressing-burst effect. Thus, our results suggest that striatal DA release captures pre-synaptic AP pattern information through different releasable pools.
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Affiliation(s)
- Shi-Rong Wang
- State Key Laboratory of Membrane Bioengineering, Institute of Molecular Medicine, Peking University, Beijing, China
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Hu MQ, Dong ZX, Zhao WX, Sun J, Zhao X, Gu DF, Zhang Y, Li BX, Yang BF. The novel mechanism of oxymatrine affecting HERG currents at different temperatures. Cell Physiol Biochem 2010; 26:513-22. [PMID: 21063089 DOI: 10.1159/000322319] [Citation(s) in RCA: 5] [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] [Accepted: 07/22/2010] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Human ether-à-go-go-related gene (hERG) has an important role in the repolarization of the cardiac action potential. Our studies were to investigate the effects of oxymatrine (one of the natural constituents extracted from Chinese herb Sophora flavescens Ait) on hERG-encoded K(+) channels at different temperatures and its underlying mechanism. METHODS The effects of oxymatrine were examined on hERG channels stably expressed in HEK293 cells using a whole-cell patch clamp technique. RESULTS At the temperature 30°C, oxymatrine inhibited hERG current in a concentration-dependent manner and the IC(50) was ∼665 μM. However at the temperature of 20°C, low concentration oxymatrine C≤100 μM increased hERG current density. However, high concentration oxymatrine C>100 μM inhibited the hERG current density significantly. Oxymatrine only affected the activation kinetic of hERG channels at all temperatures and had a high binding affinity for open state of hERG channels except the 300 μM-20°C group which had a high binding affinity for inactive state of hERG channels. CONCLUSION Oxymatrine is a low potency blocker of hERG K+ channels at 30°C, low concentration oxymatrine affect the hERG activation gating with accelerating hERG tail current at 20°C, oxymatrine is a potential hERG activator at low temperatures.
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Affiliation(s)
- Mei-Qin Hu
- Department of Pharmacology, Harbin Medical University, Harbin, China
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Zhao YG, Shen HY, Pan SD, Hu MQ. Synthesis, characterization and properties of ethylenediamine-functionalized Fe3O4 magnetic polymers for removal of Cr(VI) in wastewater. J Hazard Mater 2010; 182:295-302. [PMID: 20621418 DOI: 10.1016/j.jhazmat.2010.06.029] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2010] [Revised: 06/05/2010] [Accepted: 06/08/2010] [Indexed: 05/07/2023]
Abstract
A series of ethylenediamine (EDA)-functionalized magnetic polymers (EDA-MPs) have been prepared via suspension polymerization with the usage amount of the functional monomer glycidylmethacrylate (GMA) varied during the suspension polymerization procedure. The EDA-MPs were characterized by transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), X-ray diffractometer (XRD), thermogravimetry and differential thermogravimetry analysis (TG-DTA), Fourier-transformed infrared spectroscopy (FTIR) and elementary analyzer (EA). The adsorption properties of the EDA-MPs for the removal of Cr(VI) in wastewater were deeply studied. The results showed the adsorption efficiency was highly pH dependent and decreased with the increasing of initial concentration of Cr(VI). The adsorption data taken at the optimized condition, i.e., 35 degrees C and pH of 2.5 were well fitted with the Langmuir isotherm. The maximum adsorption capacities (q(m)) of EDA-MPs to Cr(VI) were highly related to the contents of EDA-MPs, i.e., the q(m) of EDA-MPs to Cr(VI) calculated from the Langmuir isotherm increased from 32.15 to 61.35 mg g(-1) with the increasing of the usage amount of GMA. The adsorption kinetic data were modeled by the pseudo-second-order rate equation, and the adsorption of Cr(VI) by all the present EDA-MPs reached equilibrium in 60 min.
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Affiliation(s)
- Yong-Gang Zhao
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
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Li L, Yolcubal I, Sandrin S, Hu MQ, Brusseau ML. Biodegradation during contaminant transport in porous media: 3. Apparent condition-dependency of growth-related coefficients. J Contam Hydrol 2001; 50:209-223. [PMID: 11523325 DOI: 10.1016/s0169-7722(01)00111-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The biodegradation of organic contaminants in the subsurface has become a major focus of attention, in part, due to the tremendous interest in applying in situ biodegradation and natural attenuation approaches for site remediation. The biodegradation and transport of contaminants is influenced by a combination of microbial and physicochemical properties and processes. The purpose of this paper is to investigate the impact of hydrodynamic residence time, substrate concentration, and growth-related factors on the simulation of contaminant biodegradation and transport, with a specific focus on potentially condition-dependent growth coefficients. Two sets of data from miscible-displacement experiments, performed with different residence times and initial solute concentrations, were simulated using a transport model that includes biodegradation described by the Monod nonlinear equations and which incorporates microbial growth and oxygen limitation. Two variations of the model were used, one wherein metabolic lag and cell transport are explicitly accounted for, and one wherein they are not. The magnitude of the maximum specific growth rates obtained from calibration of the column-experiment results using the simpler model exhibits dependency on pore-water velocity and initial substrate concentration (C0) for most cases. Specifically, the magnitude of micron generally increases with increasing pore-water velocity for a specific C0, and increases with decreasing C0 for a specific pore-water velocity. Conversely, use of the model wherein observed lag and cell elution are explicitly accounted for produces growth coefficients that are similar, both to each other and to the batch-measured value. These results illustrate the potential condition-dependency of calibrated coefficients obtained from the use of models that do not account explicitly for all pertinent processes influencing transport of reactive solutes.
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Affiliation(s)
- L Li
- Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Boulevard, Tucson, AZ 85721, USA
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Yan H, Hong F, Hu MQ. [The development and applications of digital signal processing (DSP)-chip]. Space Med Med Eng (Beijing) 1999; 12:76-8. [PMID: 11765779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Due to the limitation of operation speed, real time performance of digital signal processing (DSP) system is far from that of analog signal processing system in decades ago. Since early 80's, DSP chips have been greatly improved in the following aspects: operation speed, computation precision, fabrication technics, cost, chip volume, operational power supply voltage, weight and power consumption. Furthermore, development tools and methods have been developed greatly. Modern DSP chips can be operated very fast, which make the implementation of many DSP based signal processing system possible. Now DSP chips have been widely applied successfully in communication, automatic control, aerospace and medicine. DSP based technology has very promising future in manned space flight area.
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Affiliation(s)
- H Yan
- Institute of Space Medico-Engineering, Beijing, China
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Liu YF, Hu MQ, Niu SM, Wu YL. Chronic lymphocytic thyroiditis in endemic goiter. Chin Med J (Engl) 1984; 97:429-32. [PMID: 6437762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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