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Shi HF, Chen L, Wang XX, Jiang H, Dong S, Zhuang Y, Wei Y, Qiao J, Ma XD, Zhao YY. [Incidence and trend of severe postpartum hemorrhage between 2016 and 2019 in China]. Zhonghua Fu Chan Ke Za Zhi 2021; 56:451-457. [PMID: 34304436 DOI: 10.3760/cma.j.cn112141-20210209-00070] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the incidence and trend of severe postpartum hemorrhage (sPPH) in China, and to provide basic data for the development and evaluation of sPPH prevention and control strategy. Methods: Obstetric data was extracted from annual national representative sampling surveys based on the National Clinical Improvement System. From 2016 to 2019, 2 978, 3 400, 4 576 and 4 594 maternity hospitals with sPPH cases were included for statistics. The annual incidence of sPPH was calculated according to province and type of medical institutions and generalized linear model was emplyed to identify the determinants affecting sPPH incidence. Results: In China, sPPH incidence increased from 0.62% in 2016 to 0.93% in 2018, and was 0.92% in 2019. Eighteen provinces had an inverted U-shaped trend of sPPH over time and most of them had the highest incidence in 2018; ten provinces had an upward trend of sPPH and 3 provinces had a U-shaped trend. In 2019, the top five provinces with the highest sPPH incidence were Yunnan (1.88%), Beijing (1.45%), Jiangsu (1.31%), Guizhou (1.26%), and Ningxia Hui Autonomous Region (1.22%); the top five provinces with the lowest incidence were Henan (0.55%), Jiangxi (0.60%), Inner Mongolia Autonomous Region (0.64%), Liaoning (0.64%) and Gansu (0.69%). In 2019, the sPPH incidence in different types of medical institutions were as follows: tertiary public general hospital (1.15%), tertiary public specialized hospital (1.02%), secondary public general hospital (0.81%), private hospital (0.61%) and secondary public specialized hospital (0.58%). sPPH incidence was positively associated with proportion of twin pregnancies, macrosomia, primipara, and puerpera aged ≥35 years in maternity hospitals (P<0.05). Conclusions: sPPH incidence generally showes an increasing trend from 2016 and is stable at a high level in recent two years in China. It is warranted to further strengthen the monitoring of postpartum hemorrhage, and improve the capability of hierarchical management and treatment in maternity institutions and regions, in order to reduce sPPH incidence and maternal mortality.
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Affiliation(s)
- H F Shi
- Department of Obstetrics and Gynecology, Peking University Third Hospital, National Center for Healthcare Quality Management in Obstetrics, National Clinical Research Center for Obstetrics and Gynecology, Beijing 100191, China
| | - L Chen
- Department of Obstetrics and Gynecology, Peking University Third Hospital, National Center for Healthcare Quality Management in Obstetrics, National Clinical Research Center for Obstetrics and Gynecology, Beijing 100191, China
| | - X X Wang
- Department of Obstetrics and Gynecology, Peking University Third Hospital, National Center for Healthcare Quality Management in Obstetrics, National Clinical Research Center for Obstetrics and Gynecology, Beijing 100191, China
| | - H Jiang
- Department of Obstetrics and Gynecology, Peking University Third Hospital, National Center for Healthcare Quality Management in Obstetrics, National Clinical Research Center for Obstetrics and Gynecology, Beijing 100191, China
| | - S Dong
- Department of Medical Affairs, Peking University Third Hospital, Beijing 100191, China
| | - Y Zhuang
- Department of Medical Affairs, Peking University Third Hospital, Beijing 100191, China
| | - Y Wei
- Department of Obstetrics and Gynecology, Peking University Third Hospital, National Center for Healthcare Quality Management in Obstetrics, National Clinical Research Center for Obstetrics and Gynecology, Beijing 100191, China
| | - J Qiao
- Department of Obstetrics and Gynecology, Peking University Third Hospital, National Center for Healthcare Quality Management in Obstetrics, National Clinical Research Center for Obstetrics and Gynecology, Beijing 100191, China
| | - X D Ma
- Department of Healthcare Quality Evaluation, Bureau of Medical Administration, National Health Commission of the People's Republic of China, Beijing 100044, China
| | - Y Y Zhao
- Department of Obstetrics and Gynecology, Peking University Third Hospital, National Center for Healthcare Quality Management in Obstetrics, National Clinical Research Center for Obstetrics and Gynecology, Beijing 100191, China
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Wang YM, Ma YQ, Bi SC, Ma XD, Guan R, Wang SH, Lu MQ, Shi FS, Hu SH. Therapeutic effect of ginsenoside Rg1 on mastitis experimentally induced by lipopolysaccharide in lactating goats. J Dairy Sci 2019; 102:2443-2452. [PMID: 30612791 DOI: 10.3168/jds.2018-15280] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 06/26/2018] [Accepted: 11/13/2018] [Indexed: 12/29/2022]
Abstract
Escherichia coli is a cause of subclinical and clinical mastitis in dairy cattle and goats, and sometimes causes severe clinical disease that may result in death of the animal. Previous investigation showed that ginsenoside Rg1 extracted from Panax ginseng C.A. Meyer (Araliaceae) has an anti-inflammatory effect on the sepsis induced by E. coli lipopolysaccharide via competitive binding to toll-like receptor 4. We hypothesized that intravenous injection of Rg1 had therapeutic effect on mastitis experimentally induced by intramammary infusion of lipopolysaccharide in lactating goats. In this study, 9 lactating goats were randomly assigned to 1 of the 3 groups: (1) lipopolysaccharide intramammary infusion + saline intravenous injection, (2) lipopolysaccharide intramammary infusion + Rg1 intravenous injection, and (3) saline intramammary administration + saline intravenous injection. Because no adverse clinical signs were observed after intramammary infusion of saline and intravenous injection of Rg1 in a preliminary experiment, and available qualified goats were limited in this study, this treatment was not included in this study. One udder half of each goat received intramammary infusion of lipopolysaccharide (50 μg/kg of body weight; groups 1 and 2) or saline solution (group 3), and the other half was infused with 2 mL of saline solution at h 0. Afterward, intravenous injections of saline solution (groups 1 and 3) or Rg1 (2.5 mg/kg of body weight; group 2) were administered at h 2 and 4 post-lipopolysaccharide challenge. Blood and milk samples were collected 3, 6, 9, 12, 15, 18, 21, 24, 48, and 72 h post-lipopolysaccharide challenge, and clinical signs were monitored hourly after lipopolysaccharide challenge within the first 10 h and at the same time points as blood samples. The results showed that Rg1 treatment downregulated rectal temperature, udder skin temperature, udder girth, milk somatic cell count, and N-acetyl-β-d-glucosaminidase and upregulated milk production, lactose, and recovered blood components, such as white blood cells, neutrophils, lymphocytes, total proteins, albumin, and globulin. Considering the positive therapeutic effect on lipopolysaccharide-induced mastitis in goats presented in this study as well as the anti-inflammatory activity found previously, the botanical Rg1 deserves further study as a therapeutic agent in the treatment of E. coli mastitis in dairy animals.
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Affiliation(s)
- Y M Wang
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China
| | - Y Q Ma
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China
| | - S C Bi
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China
| | - X D Ma
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China
| | - R Guan
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China
| | - S H Wang
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China
| | - M Q Lu
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China
| | - F S Shi
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China
| | - S H Hu
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Zhejiang 310058, China.
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Lin LH, Huang YQ, Ma XD. [Effects of EZH2 siRNA silence on proliferation, apoptosis, and histone methylation, acetylation in HL-60 cells]. Zhonghua Xue Ye Xue Za Zhi 2017; 38:249-252. [PMID: 28395453 PMCID: PMC7348374 DOI: 10.3760/cma.j.issn.0253-2727.2017.03.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - X D Ma
- Department of Hematology, Zhangzhou Affiliated Hospital of Fujian Medical University, Zhangzhou 363000, China
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Hou DD, Zhu RZ, Sun Z, Ma XD, Wang DC, Timothy H, Chen WN, Yan F, Lei P, Han XW, Chen DX, Cai LP, Guan HQ. Serum Proteomics Analysis in Rats of Immunosuppression Induced by Chronic Stress. Scand J Immunol 2017; 84:165-73. [PMID: 27384769 DOI: 10.1111/sji.12461] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 06/01/2016] [Accepted: 07/05/2016] [Indexed: 01/03/2023]
Abstract
The immune system can be damaged by chronic stress. However, for this process, the involved molecular alterations and their regulatory roles played in immunosuppression still remain unclear. This study was aimed to identify the differences in serum protein expressions that are closely associated with the effect of chronic stress on immune function. Serum protein levels of rats in control group and chronic stress group were measured by iTRAQ analysis. Subsequently, among the 121 differentially expressed proteins screened between the two groups, 46 proteins were upregulated (>1.5-fold, P < 0.05), while 75 proteins were downregulated (<0.67-fold, P < 0.05). Bioinformatics analysis revealed that most of the differentially expressed proteins were in relation with the metabolic, cellular, response stimulus and immune system processes. The significantly differential expression of ceruloplasmin, haptoglobin, catalase and peroxiredoxin-1 were picked out for reconfirmation by ELISA analysis. The results were consistent with those obtained by iTRAQ. What is more, the roles of above-mentioned four proteins, apolipoprotein B-100 and heat-shock protein 90 in immunosuppression induced by chronic stress were discussed. Taken together, these findings may provide a new insight into better understanding the molecular mechanisms of immunosuppression induced by chronic stress.
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Affiliation(s)
- D D Hou
- Basic Medical Science College, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, P. R. China.,Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications, Liaoning University of Traditional Chinese Medicine, Shenyang, China
| | - R Z Zhu
- Shengjing Hospital, China Medical University, Shenyang, 110004, China
| | - Z Sun
- Liaoning People's Hospital, Shenyang, China
| | - X D Ma
- Experiment and Technology Center, Liaoning University of Traditional Chinese Medicine, Shenyang, P. R. China
| | - D C Wang
- The Second Clinical Medical Institute, Liaoning University of Traditional Chinese Medicine, Shenyang, P. R. China
| | - H Timothy
- The First Clinical Medical Institute, Liaoning University of Traditional Chinese Medicine, Shenyang, P. R. China
| | - W N Chen
- Experiment and Technology Center, Liaoning University of Traditional Chinese Medicine, Shenyang, P. R. China
| | - F Yan
- The First Clinical Medical Institute, Liaoning University of Traditional Chinese Medicine, Shenyang, P. R. China
| | - P Lei
- Basic Medical Science College, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, P. R. China.,Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications, Liaoning University of Traditional Chinese Medicine, Shenyang, China
| | - X W Han
- Basic Medical Science College, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, P. R. China.,Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications, Liaoning University of Traditional Chinese Medicine, Shenyang, China
| | - D X Chen
- Basic Medical Science College, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, P. R. China.,Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications, Liaoning University of Traditional Chinese Medicine, Shenyang, China
| | - L P Cai
- Basic Medical Science College, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, P. R. China.,Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications, Liaoning University of Traditional Chinese Medicine, Shenyang, China
| | - H Q Guan
- Basic Medical Science College, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, P. R. China.,Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications, Liaoning University of Traditional Chinese Medicine, Shenyang, China
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Yang ZJ, Pan XM, Ma XD, Ruan BW, Zhou RB, Zhang C. Electron cyclotron emission radiometer upgrade on the J-TEXT tokamak. Rev Sci Instrum 2016; 87:11E112. [PMID: 27910414 DOI: 10.1063/1.4960167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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
To meet experimental requirements, the J-TEXT electron cyclotron emission (ECE) diagnostic is being upgraded. The front end antenna and transmission line have been modified and a new 8-channel W-band detecting unit has been developed. The improved ECE system will extend the frequency range from 94.5-124.5 GHz to 80.5-124.5 GHz. This will enable the system to cover the most plasma in the radius direction for BT = 1.8-2.2 T, and it even can cover almost the whole plasma range ρ = - 0.8-0.9 (minus means the high field side) at BT = 1.8 T. A new auxiliary channel bank with 8 narrow band, tunable yttrium iron garnet filters is planned to add to the ECE system. Due to observations along a major radius, perpendicular to BT, and relatively low electron temperature, Doppler and relativistic broadening are minimal and thus high spatial resolution measurements can be made at variable locations with these tunable channels.
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Affiliation(s)
- Z J Yang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - X M Pan
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - X D Ma
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - B W Ruan
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - R B Zhou
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - C Zhang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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Pan XM, Yang ZJ, Ma XD, Zhu YL, Luhmann NC, Domier CW, Ruan BW, Zhuang G. Design of the 2D electron cyclotron emission imaging instrument for the J-TEXT tokamak. Rev Sci Instrum 2016; 87:11E106. [PMID: 27910430 DOI: 10.1063/1.4959875] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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 new 2D Electron Cyclotron Emission Imaging (ECEI) diagnostic is being developed for the J-TEXT tokamak. It will provide the 2D electron temperature information with high spatial, temporal, and temperature resolution. The new ECEI instrument is being designed to support fundamental physics investigations on J-TEXT including MHD, disruption prediction, and energy transport. The diagnostic contains two dual dipole antenna arrays corresponding to F band (90-140 GHz) and W band (75-110 GHz), respectively, and comprises a total of 256 channels. The system can observe the same magnetic surface at both the high field side and low field side simultaneously. An advanced optical system has been designed which permits the two arrays to focus on a wide continuous region or two radially separate regions with high imaging spatial resolution. It also incorporates excellent field curvature correction with field curvature adjustment lenses. An overview of the diagnostic and the technical progress including the new remote control technique are presented.
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Affiliation(s)
- X M Pan
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Z J Yang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - X D Ma
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Y L Zhu
- School of Physics, University of Science and Technology of China, Anhui 230026, China
| | - N C Luhmann
- Davis Millimeter Wave Research Center, University of California, Davis, California 95616, USA
| | - C W Domier
- Davis Millimeter Wave Research Center, University of California, Davis, California 95616, USA
| | - B W Ruan
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - G Zhuang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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Yang ZJ, Xiao Y, Ma XD, Pan XM, Xiao JS. The design of a correlation electron cyclotron emission system on J-TEXT. Rev Sci Instrum 2015; 86:043501. [PMID: 25933856 DOI: 10.1063/1.4917271] [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: 06/04/2023]
Abstract
To study the anomalous transport, a correlation electron cyclotron emission (CECE) was planned to be developed on J-TEXT for electron temperature fluctuation measurement. The spectral decorrelation method was employed for the CECE system. It was developed based on the previous 16-channel electron cyclotron emission system. They shared the optical transmission line and mixer. The CECE part consists of 4 channels. Two fixed frequency narrow band filters were used for two channels and two yttrium iron garnet (YIG) filters for the other two channels. To meet the measuring requirement, some tests have been taken for the YIG filters. The results show good performance of the filters. Gaussian optics is used to produce a good poloidal resolution. Wavenumbers resolved by the CECE diagnostic are k(θ) ≤ 1.5 rad/cm and k(r) ≤ 12 rad/cm. Some preliminary experiment results are also presented in this paper.
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Affiliation(s)
- Z J Yang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Y Xiao
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - X D Ma
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - X M Pan
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - J S Xiao
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Ma XD, Cai GQ, Zou W, Huang YH, Zhang JR, Wang DT, Chen BL. First evidence for the contribution of the genetic variations of BRCA1-interacting protein 1 (BRIP1) to the genetic susceptibility of cervical cancer. Gene 2013; 524:208-13. [PMID: 23644138 DOI: 10.1016/j.gene.2013.04.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 04/06/2013] [Accepted: 04/08/2013] [Indexed: 02/06/2023]
Abstract
BRIP1 (BRCA1-interacting protein 1), a DNA-dependent ATPase and a DNA helicase, is critical for BRCA-associated DNA damage repair functions, and may be involved in the development of cervical cancer. Genetic markers in different regions of the BRIP1 gene have a plausible role in modulating the risk of cervical cancer. In this study, we evaluate the association between the BRIP1 variations and the risk of cervix cancer. We examined the potential association between cervical cancer and eighteen single nucleotide polymorphisms (SNPs, rs2048718, rs16945692, rs4968451, rs6504074, rs4988344, rs8077088, rs10515211, rs9897121, rs9906313, rs2159450, rs4986764, rs11871785, rs4986763, rs11079454, rs7213430, rs34289250, rs4988345 and rs12937080) of the BRIP1 gene using the MassARRAY system. The participants enrolled in this study included 298 patients with cervical cancer and 286 healthy women as the healthy controls from a Chinese Han population. The results showed that rs16945692 (intron 1), rs4968451 (intron 4), rs4986764 (exon 18) and rs7213430 (3'UTR) were significantly associated with cervical cancer (P<0.05). Furthermore, strong linkage disequilibrium (LD) was observed in three blocks (D'>0.9), and significantly more T-A-C-A haplotypes (block 1) (P=0.001) were found in the patients with cervical cancer. Significantly higher frequencies of C-A-T haplotypes (block 2) (P=0.018) and A-A haplotypes (block 3) (P=0.009) were detected in the healthy controls than in the patients with cervical cancer, suggesting that they may show protective effects against cervical cancer. These findings point to a role for the BRIP1 gene polymorphisms in cervical cancer in a Chinese Han population, and may be informative for future genetic or biological studies on cervical cancer.
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Affiliation(s)
- X D Ma
- Department of Obstetrics and Gynecology, Xijing Hospital, Fourth Military Medical University, 17 Changle West Road, Xi'an 710032, China
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Li J, Przybylski M, Yildiz F, Ma XD, Wu YZ. Oscillatory magnetic anisotropy originating from quantum well states in Fe films. Phys Rev Lett 2009; 102:207206. [PMID: 19519071 DOI: 10.1103/physrevlett.102.207206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Indexed: 05/27/2023]
Abstract
The magnetic anisotropy of Fe film grown on vicinal Ag(1,1,10) surfaces was studied with the in situ magneto-optic Kerr effect. Below 200 K, strong oscillations of the uniaxial magnetic anisotropy as a function of Fe thickness with a period of 5.7 monolayers are found, which can even cause the easy magnetization axis to oscillate between perpendicular and parallel to the steps. Such novel oscillation of the anisotropy is attributed to the quantum well states of d-band electrons at the Fermi level in the Fe film. This is unlike the previously observed oscillatory behaviors of ferromagnetic films caused by the quantum well states in nonmagnetic interfacing layers.
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Affiliation(s)
- J Li
- Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle, Germany
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Chen L, Jiang SP, Wan LB, Ma XD, Li MF. Radiobiological investigations of soft X-rays near carbon, nitrogen, oxygen K-shell edges on Aspergillus oryzae spores. Radiat Prot Dosimetry 2008; 128:68-71. [PMID: 17545664 DOI: 10.1093/rpd/ncm308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Soft X-rays at carbon, nitrogen, oxygen K-shell edges have special radiobiological effects. Using Aspergillus oryzae spores as sample, the radiation effects of soft X-rays near the K-shell edges of C, N and O elements from synchrotron radiation were investigated. Also the dose depositions of different X-ray energies in spore were discussed. At the same time, the spores were irradiated by gamma rays from 60Co and relative biological effects were compared with those produced by soft X-rays. The results showed that soft X-rays near K-shell edges of O element had higher ability of radiation damage than that of X-rays near K-shell edges of C and N elements as compared with one another. But they all had higher killing abilities per unit dose than that of gamma rays from 60Co. The relative biological effects (RBEs), the comparison of dose to gamma rays at 10% survival level, of the three soft X-rays were 1.65, 1.73 and 1.91, respectively.
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Affiliation(s)
- L Chen
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, PR China
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Ke T, Ma XD, Mao PH, Jin X, Chen SJ, Li Y, Ma LX, He GY. A mutant α-amylase with only part of the catalytic domain and its structural implication. Biotechnol Lett 2006; 29:117-22. [PMID: 17091385 DOI: 10.1007/s10529-006-9208-2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2006] [Revised: 09/12/2006] [Accepted: 09/13/2006] [Indexed: 10/23/2022]
Abstract
A truncated mutant alpha-amylase, Xa-S2, was obtained from Xanthomonas campestris wild type alpha-amylases (Xa-WT) through random mutagenesis that contained 167 amino acid residues (approx 65% shorter than that of Xa-WT). Secondary structure prediction implied that Xa-S2, would be unable to form the whole (beta/alpha)(8)-barrel catalytic domain and did not have the three conserved catalytic residues of wild type alpha-amylase, but it still displays the starch-hydrolyzing activity. Xa-S2 was prepared, characterized and compared to the recombinant wild-type enzymes. The K (m) for starch was 32 mg/ml; activity was optimal at pH 6.2 and 30 degrees C. In contrast, the K (m) for starch of Xa-WT was 8 mg/ml and optimal enzyme activity was at pH 6.0-6.2 and 45-50 degrees C. Our results suggested that Xa-S2 is a new amylase with a minimal catalytic domain for hydrolyzing substrates with of alpha-1,4-glucosidic bonds.
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Affiliation(s)
- T Ke
- China-UK HUST-RRes Genetic Engineering and Genomics Joint Laboratory, Huazhong University of Science and Technology, Wuhan, Hubei, China
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Ma XD, Ke T, Li YX, Huang CX, Song AD, Chen HG, Wu YH, Jia XC, He GY. In vitro mutagenesis of Xanthomonas campestris alpha-amylase gene by partially replacing deoxythymidine triphosphate with 5-bromo-2'-deoxyuridine-5'-triphosphate using a PCR technique. Biotechnol Lett 2004; 26:171-5. [PMID: 15000487 DOI: 10.1023/b:bile.0000012901.89522.20] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Three mutants of the wild type alpha-amylase gene from Xanthomonas campestris pv. campestris 8004 were obtained using a PCR technique in which deoxythymidine triphosphate (dTTP) was partially replaced by 5-bromo-2'-deoxyuridine-5'-triphosphate (BrdUTP), at an optimal dTTP:BrdUTP ratio of 1000:1. Of thre three mutants that were obtained and which were sequenced, one mutant with 40 times higher activity than the wild type alpha-amylase gene product was obtained by using primary PCR products as a template for a second PCR reaction.
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Affiliation(s)
- X D Ma
- China-UK HUST-RRes Crop Genetic Engineering and Genomics Joint Laboratory, Huazhong University of Science and Technology, Wuhan 430074, PR China
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Reece EA, Ma XD, Wu YK, Dhanasekaran D. Aberrant patterns of cellular communication in diabetes-induced embryopathy. I. Membrane signalling. J Matern Fetal Neonatal Med 2002; 11:249-53. [PMID: 12375679 DOI: 10.1080/jmf.11.4.249.253] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE Our purpose was to investigate the role of membrane signalling in the mechanism of diabetes-induced embryopathy. METHODS Three groups of 70-90-day-old Sprague-Dawley rats were employed in our study: group 1 was normal control rats receiving a normal diet; group 2 represented experimentally induced diabetic rats with malformed offspring (intravenous injection of 65 mg/kg streptozotocin on pregnancy day 6) and group 3 included streptozotocin-induced diabetic rats with normal offspring. Embryos were examined on day 12 under light microscopy, categorized as morphologically normal or defective, and yolk sac cells were harvested from each group. Activities of ERK1 and 2, Raf-1, JNK1 and 2 in yolk sac cells were analyzed by Western blot with primary antibodies specific to the phosphorylated kinases, respectively. RESULTS A strong link between hyperglycemia and congenital malformations was confirmed. Key mitogen-activated protein kinases serve as syllabic intermediates: increased activities of Jun-amino-terminal kinase (JNK1 and 2) and decreased activities of extracellular signal-regulated kinase (ERK1 and 2) were observed during hyperglycemia-induced embryopathy. CONCLUSIONS Poorly controlled maternal diabetes results in embryopathy which is mediated via a pattern of aberrant cellular communication manifested by both macroscopic and microscopic membrane injury.
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Affiliation(s)
- E A Reece
- Department of Obstetrics and Gynecology, Chemistry and Molecular Biology, The University of Arkansas College of Medicine, Little Rock 72205, USA
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Abstract
1. Oxidative mechanisms have been implicated in neonatal cardiomyocyte hypertrophy. We and others have shown that a HMG-CoA reductase inhibitor preserves endogenous antioxidant enzyme activity and inhibits cardiac hypertrophy in vivo. We therefore have examined whether noradrenaline (NA) induces the generation of reactive oxygen species (ROS) during its induction of neonatal cardiomyocyte hypertrophy and whether simvastatin, a HMG-CoA reductase inhibitor, attenuates ROS production and thus NA-induced hypertrophy of cardiomyocytes. 2. NA increased the intracellular ROS levels in a concentration-dependent manner. This increase of ROS was significantly inhibited by simvastatin and catalase. Prazosin partially suppressed NA-induced increase of ROS and beating, while preincubation with both prazosin and propranolol completely abolished NA-evoked increase of ROS and beating. Simvastatin did not affect NA-induced increase of beating. 3. The NA-induced increase of protein content was partially suppressed by prazosin and completely abolished by preincubation with both prazosin and propranolol. Simvastatin inhibited the increase of NA-induced increase of RNA content and [(3)H]-leucine incorporation in a concentration-dependent manner. Mevalonic acid (MVA) reversed the inhibition of NA-induced RNA and protein increase by simvastatin. Catalase also inhibited the NA-induced increase of RNA and protein. 4. We conclude that the inhibitory effects of simvastatin on myocyte hypertrophy were associated with its antioxidant effects and inhibition of MVA-metabolism pathway in neonatal rat cardiomyocytes. NA-induced increases of intracellular ROS and cardiomyocyte hypertrophy requires both alpha and beta adrenoceptors activation in neonatal rat cardiomyocytes. The increases of ROS induced by NA is required for hypertrophy.
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Affiliation(s)
- J D Luo
- Department of Pharmacology, Guangzhou Medical College, Guangzhou 510182, China. Central Laboratory, The First Military Medical University, Guangzhou 510000, China.
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Ma XD, Hauerberg J, Pedersen DB, Juhler M. Effects of morphine on cerebral blood flow autoregulation CO2-reactivity in experimental subarachnoid hemorrhage. J Neurosurg Anesthesiol 1999; 11:264-72. [PMID: 10527146 DOI: 10.1097/00008506-199910000-00007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Previous reports show that naloxone improves ischemic deficits and clinical conditions in patients after subarachnoid hemorrhage (SAH). These observations have raised concern about the routine use of morphine in the treatment of severe headache after SAH. The present study was carried out to investigate the effects of morphine on cerebral vasoreactivity after experimental SAH. Cerebral blood flow (CBF) autoregulation was studied in two groups of eight rats each with experimental SAH. A bolus intravenous injection of morphine, 1 mg/kg, was administered in one group and the other was used as a control group. During eucapnia, CBF was measured by the intracarotid 133Xenon method during decreasing mean arterial blood pressure (MABP). CO2-reactivity was investigated in two corresponding groups where CBF was measured at decreasing PaCO2 levels during constant MABP. Morphine decreased mean baseline CBF by 34% and 26% in the study of autoregulation and CO2-reactivity, respectively. Cerebral blood flow autoregulation was found impaired in both controls and the morphine group. However, the mean slope of the linear regression lines of CBF/MABP was 0.49 +/- 0.32 ml/100g/min/mm Hg in the morphine group, which was significantly lower than 1.24 +/- 0.59 ml/100g/min/mm Hg in the controls (p < 0.05). Also the mean CO2-reactivity was significantly lower, 0.64 +/- 0.53 %/0.1kPa, in the morphine group, compared to 2.36 +/- 0.87 %/0.1kPa in the controls (p < 0.001). The results show that in rats with SAH, morphine partially restores CBF autoregulation but attenuates CO2-reactivity.
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Affiliation(s)
- X D Ma
- Department of Neurosurgery, The Neuroscience Center, Rigshospitalet, Copenhagen, Denmark
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Yang DP, Goldberg KM, Ma XD, Magargle W, Rappaport R. Development of a fluorescent focus identification assay using serotype-specific monoclonal antibodies for detection and quantitation of rotaviruses in a tetravalent rotavirus vaccine. Clin Diagn Lab Immunol 1998; 5:780-3. [PMID: 9801334 PMCID: PMC96201 DOI: 10.1128/cdli.5.6.780-783.1998] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A fluorescent focus identification assay (FFIDA) was developed for use in experimental studies and for quantitation of the components in a tetravalent live oral rotavirus vaccine. The assay utilizes four serotype-specific neutralizing monoclonal antibodies (MAb) to detect and quantify individual rotaviruses by immunofluorescence staining of fixed virus-infected monkey kidney cells. In mixed virus infections, all four MAb, W1 (serotype 1), 1C10 (serotype 2), R1 (serotype 3), and S4 (serotype 4), specifically stain the relevant homologous serotype without exhibiting any cross-reactivity against the other serotypes. Furthermore, the test is sensitive enough to differentiate at least twofold (0.3 log) differences in virus titer. The results of testing four individual experimental vaccine lots three or more consecutive times showed that all four lots contained similar proportions of the four vaccine strains as detected by the classical plaque neutralization identification test. The rapidity and efficiency of the FFIDA are desirable attributes that make it suitable for use in studies requiring identification and quantitation of one or more of the four major rotavirus serotypes.
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Affiliation(s)
- D P Yang
- Wyeth Ayerst Research, Philadelphia, Pennsylvania 19101, USA
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Ma XD, Tian YL, Wang J. [Application of compound Chinese medicine ice cubes in the mouth following tonsillectomy]. Zhonghua Hu Li Za Zhi 1996; 31:703-4. [PMID: 9304940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Xie SJ, Han JS, Ma XD, Mei LM, Lin DL. Localized vibrational modes around bipolarons in polythiophene. Phys Rev B Condens Matter 1995; 51:11928-11931. [PMID: 9977935 DOI: 10.1103/physrevb.51.11928] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Li M, Ma XD, Peng CB, Zhao JG, Mei LM, Gu YS, Chai WP, Mai ZH, Shen BG, Liu YH, Dai DS. Magnetic-polarization effect of Pd layers in Fe/Pd multilayers. Phys Rev B Condens Matter 1994; 50:10323-10326. [PMID: 9975118 DOI: 10.1103/physrevb.50.10323] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Koo GC, Rosen H, Sirotina A, Ma XD, Shultz LD. Anti-CD11b antibody prevents immunopathologic changes in viable moth-eaten bone marrow chimeric mice. J Immunol 1993; 151:6733-41. [PMID: 8258688] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The effect of in vivo treatment with anti-CD11b (MAC-1) antibody (Ab) was examined in an inflammatory disease model, the viable moth-eaten (mev) mutant mouse. The autosomal recessive mev gene occurred spontaneously as a point mutation of the hematopoietic cell protein tyrosine phosphatase in C57BL/6 mice. Homozygotes (mev/mev) develop a chronic myelomonocytic inflammation, involving accumulation of myelomonocytic cells in lungs and skin, resulting in interstitial pneumonitis and severe edema in the paws. These mice also exhibit abnormalities in lymphoid development, thymic atrophy, with T cell and NK cell dysfunction. These inflammatory changes are transferrable by bone marrow cells of mev/mev mice, indicating that mev mutation is due to a stem cell defect in the myelomonocytic pathway. An anti-CD-11b (5C6) Ab inhibited the immunopathologic changes in the bone marrow chimeras, when the Ab treatment was initiated on day -1 or day 0 of the bone marrow transplant. The lungs, paws, and thymus all remained normal after treatment. Furthermore, the Ab also delayed the onset of the mev syndromes when the Ab was given 10 days after the bone marrow transfer. Therefore anti-CD11b Ab inhibited inflammation both prophylactically and therapeutically, and restored normal function of T and NK cells in this disease model. These results support the contention that CD11b molecules expressed in the myelomonocytic cells play a critical role in this naturally occurring inflammatory disease.
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Affiliation(s)
- G C Koo
- Department of Immunology Research, Merck Research Laboratories, Merck and Co., Rahway, NJ 07065
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Koo GC, Rosen H, Sirotina A, Ma XD, Shultz LD. Anti-CD11b antibody prevents immunopathologic changes in viable moth-eaten bone marrow chimeric mice. The Journal of Immunology 1993. [DOI: 10.4049/jimmunol.151.12.6733] [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: 01/01/2023]
Abstract
Abstract
The effect of in vivo treatment with anti-CD11b (MAC-1) antibody (Ab) was examined in an inflammatory disease model, the viable moth-eaten (mev) mutant mouse. The autosomal recessive mev gene occurred spontaneously as a point mutation of the hematopoietic cell protein tyrosine phosphatase in C57BL/6 mice. Homozygotes (mev/mev) develop a chronic myelomonocytic inflammation, involving accumulation of myelomonocytic cells in lungs and skin, resulting in interstitial pneumonitis and severe edema in the paws. These mice also exhibit abnormalities in lymphoid development, thymic atrophy, with T cell and NK cell dysfunction. These inflammatory changes are transferrable by bone marrow cells of mev/mev mice, indicating that mev mutation is due to a stem cell defect in the myelomonocytic pathway. An anti-CD-11b (5C6) Ab inhibited the immunopathologic changes in the bone marrow chimeras, when the Ab treatment was initiated on day -1 or day 0 of the bone marrow transplant. The lungs, paws, and thymus all remained normal after treatment. Furthermore, the Ab also delayed the onset of the mev syndromes when the Ab was given 10 days after the bone marrow transfer. Therefore anti-CD11b Ab inhibited inflammation both prophylactically and therapeutically, and restored normal function of T and NK cells in this disease model. These results support the contention that CD11b molecules expressed in the myelomonocytic cells play a critical role in this naturally occurring inflammatory disease.
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Affiliation(s)
- G C Koo
- Department of Immunology Research, Merck Research Laboratories, Merck and Co., Rahway, NJ 07065
| | - H Rosen
- Department of Immunology Research, Merck Research Laboratories, Merck and Co., Rahway, NJ 07065
| | - A Sirotina
- Department of Immunology Research, Merck Research Laboratories, Merck and Co., Rahway, NJ 07065
| | - X D Ma
- Department of Immunology Research, Merck Research Laboratories, Merck and Co., Rahway, NJ 07065
| | - L D Shultz
- Department of Immunology Research, Merck Research Laboratories, Merck and Co., Rahway, NJ 07065
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