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27 results on '"Chen, Xianmei"'

2. Progress in the research on radiation-induced defects in nanomaterials

Author

GAN Pingping, CHEN Xianmei, JIANG Zhiwen, WANG Yunlong, and MA Jun

Subjects
radiation-induced defects, nanomaterials, 2d materials, porous materials, radiation damage, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798, Medical physics. Medical radiology. Nuclear medicine, R895-920
Abstract

Radiation-induced defects in nanomaterials are an important aspect of the research on the effects of radiation on materials. Recently, the research on radiation-induced defects in semiconductor materials, low-dimensional materials, and high-specific-surface porous materials has become a new application of radiation technology. Radiation-induced nanomaterial defect engineering has the potential to be used to improve the electromagnetic, catalytic, adsorption, and mechanical properties of nanomaterials and will play an important role in materials science, electronic-device development, catalysis, and environmental science. Therefore, this review presents the recent progress and state-of-art in the formation and tuning mechanism of radiation-induced defects in nanomaterials and provides a direction for future development.

Published
2022
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8. Characteristics of phenotypic antibiotic resistance of Helicobacter pylori and its correlation with genotypic antibiotic resistance: A retrospective study in Ningxia

Author

Hu, Shengjuan, primary, Zhou, Yan, additional, Deng, Yanhong, additional, Bo, Yang, additional, Chen, Xianmei, additional, Yang, Wei, additional, Shi, Ruichun, additional, Zhao, Wei, additional, Hou, Zhanbing, additional, Hu, Jianping, additional, Liu, Jianguo, additional, Zhang, Xilong, additional, Yong, Heli, additional, Wang, Ping, additional, Li, Fei, additional, Qi, Hailong, additional, Wang, Xiaoyun, additional, Jin, Lijuan, additional, Cui, Ting, additional, Yong, Haijiang, additional, Li, Xue, additional, Yang, Bin, additional, Yu, Yuehua, additional, Ma, Bin, additional, Fu, Lei, additional, Wang, Xuemei, additional, Ma, Zhen, additional, Tang, Na, additional, You, Yanjie, additional, Guo, Jianyang, additional, Yu, Xiaobing, additional, Yao, Li, additional, Gao, Ruiping, additional, Li, Yanling, additional, Xin, Ruijuan, additional, Liu, Jianfang, additional, Cao, Zhenzi, additional, Li, Hongliang, additional, Ma, Linke, additional, Ma, Shoucheng, additional, Cao, Ying, additional, Tang, Yuanyuan, additional, Liu, Jun, additional, Hao, Qian, additional, Li, Xiaofei, additional, Li, Xuemei, additional, Mu, Rui, additional, Niu, Min, additional, Su, Xiaoming, additional, and Gao, Hengjun, additional

Published
2023
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13. Prevalence and risk factors of Helicobacter pylori infection in Ningxia, China: comparison of two cross-sectional studies from 2017 and 2022

Author

Zhou, Yan, Deng, Yanhong, You, Yanjie, Li, Xue, Zhang, Di, Qi, Hailong, Shi, Ruichun, Yao, Li, Tang, Yuanyuan, Li, Xiaofei, Ma, Linke, Li, Yanlin, Liu, Jun, Feng, Yaning, Chen, Xianmei, Hao, Qian, Li, Xuemei, Li, Yuzhen, Niu, Min, Gao, Hengjun, Bai, Feihu, and Hu, Shengjuan

Subjects
Original Article
Abstract

Objectives: Helicobacter pylori (H. pylori) infection causes a variety of intragastric and extragastric diseases. Despite its decreasing global prevalence, it remains a major public health problem in many developing countries. This study aimed to understand the prevalence of H. pylori infection and its risk factors in five cities of the Ningxia Hui Autonomous Region, an area with high incidence of gastric cancer. Methods: Cross-sectional studies were conducted in Ningxia from 2017 and 2022, to detect the prevalence of H. pylori using the (14)C urea breath test. All participants completed a questionnaire that included demographics, personal habits, household economic characteristics, and previous health status. Multiple logistic regression analyses were used to identify independent factors for H. pylori infection. Results: Our findings demonstrated that the prevalence of H. pylori infection in Ningxia decreased significantly from 60.3% in 2017 to 43.6% in 2022, with an increase in public awareness rate from 35.9% in 2017 to 68.5% in 2022. The lowest infection rate was found in Zhongwei and highest in Guyuan. The prevalence of H. pylori infection was higher among Hui ethnicity, farmers, individuals living in rural areas, individuals with lower income, low education, and those who consumed less fruit. Gallbladder, respiratory, cardiovascular and autoimmune diseases were not associated with H. pylori infection. Conclusions: The prevalence of H. pylori in Ningxia decreased in the past five years. Ethnicity, location, occupation, income, education, and consumption of fruits were independent risk factors for H. pylori infection in Ningxia. It was not associated with extra-gastric disease.

Published
2022

14. The electric and magnetic properties of novel two-dimensional MnBr2 and MnI2 from first-principles calculations.

Author

Luo, Jia, Xiang, Gang, Tang, Yongliang, Ou, Kai, and Chen, Xianmei

Subjects
ELECTRIC properties, WIDE gap semiconductors, MAGNETIC properties, PHONONS
Abstract

The structural, electronic, and magnetic properties of two-dimensional (2D) manganese dibromide (MnBr2) and manganese diiodide (MnI2) are investigated using first principles calculations. The dynamical and thermal stabilities of 2D MnBr2 and MnI2 have been illustrated from the phonon dispersion and molecular dynamic calculations. From the phonon dispersion, three Raman-active and three infrared-active vibration modes are found. The calculated formation energies and cleavage energies indicate that 2D MnBr2 and MnI2 are energetically stable and could be potentially obtained by exfoliation. The hybrid functional theory is employed to discover that 2D MnBr2 and MnI2 are wide gap semiconductors. The magnetic frustration is revealed by the calculation of magnetic exchange interaction and magnetocrystalline anisotropy interaction. By analyzing different magnetic orders, the relatively weak magnetic exchange is attributed to the competition of the direct exchange and the superexchange interaction. [ABSTRACT FROM AUTHOR]

Published
2020
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15. A Survey of Helicobacter pylori Antibiotic-Resistant Genotypes and Strain Lineages by Whole-Genome Sequencing in China

Author

Zhou, Yan, primary, Zhong, Zishao, additional, Hu, Shengjuan, additional, Wang, Jing, additional, Deng, Yanhong, additional, Li, Ximei, additional, Chen, Xianmei, additional, Li, Xue, additional, Tang, Yuanyuan, additional, Li, Xiaofei, additional, Hao, Qian, additional, Liu, Jun, additional, Sang, Tian, additional, Bo, Yang, additional, and Bai, Feihu, additional

Published
2022
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18. Prevalence of High-Risk Human Papillomavirus Infection in China

Author

Shangwei Wu, Xuekui He, Chen Xianmei, R. Marshall Austin, Xiaolei Guo, Chengquan Zhao, Baowen Zheng, Huaitao Yang, and Zhengyu Zeng

Subjects
Adult, China, medicine.medical_specialty, Adolescent, Polymerase Chain Reaction, Young Adult, 03 medical and health sciences, 0302 clinical medicine, Prevalence, Humans, Medicine, 030212 general & internal medicine, Young adult, Human papillomavirus, Child, Early Detection of Cancer, Aged, Retrospective Studies, Aged, 80 and over, Gynecology, Cervical cancer, Cervical screening, business.industry, Incidence (epidemiology), Papillomavirus Infections, Retrospective cohort study, General Medicine, Middle Aged, medicine.disease, Test (assessment), 030220 oncology & carcinogenesis, Female, business, Demography
Abstract

Objectives: This study on human papillomavirus (HPV) testing in China’s largest independent laboratory accredited by the international Laboratory Accreditation Program of the College of American Pathologists extends previous reports on cervical screening test results from this Chinese facility. Methods: A retrospective laboratory database search from 2007 to 2014 documented high-risk HPV test results using either Hybrid Capture 2 (HC2; Qiagen, Hilden, Germany) or multiplex polymerase chain reaction fluorescence testing (MPFT) methods. Results: During the study period, HPV testing steadily increased, with 643,702 HC2 and 27,641 MPFT HPV tests performed. The mean ages of the tested women were 35.0 years using HC2 and 38.3 years using MPFT. The HC2 HPV-positive rate was 21.7%, significantly higher than 15.7% with MPFT ( P < .0001), with bimodal peak incidence in adolescents and women aged 60 to 69 years. Conclusions: Use of HPV testing in cervical screening is increasing in China. HC2 HPV-positive rates around 20% in all age groups from more than 500,000 tested Chinese women are consistent with previous reports from China and significantly higher than published HC2 HPV-positive rates in populations with more widespread cervical screening. MPFT HPV-positive rates were slightly lower in every age group. The high HPV-positive rate likely reflects limited routine cervical screening and high cervical cancer incidence in China.

Published
2016

21. Direct Observation of Nanoscale Light Confinement without Metal

Author

Liu, Yunxin, primary, Vanacken, Johan, additional, Chen, Xianmei, additional, Han, Junbo, additional, Zhong, Zhiqiang, additional, Xia, Zhengcai, additional, Chen, Borong, additional, Wu, Huan, additional, Jin, Zhao, additional, Ge, Jun-Yi, additional, Huang, Junwei, additional, Meng, Lei, additional, Duan, Xiangfeng, additional, Huang, Yu, additional, Peng, Qing, additional, Moshchalkov, Victor V., additional, and Li, Yadong, additional

Published
2018
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24. Luminescence of fixed site Ag nanoclusters in a simple oxyfluoride glass host and plasmon absorption of amorphous Ag nanoparticles in a complex oxyfluoride glass host

Author

Shestakov, Mikhail V., additional, Meledina, Maria, additional, Turner, Stuart, additional, Baekelant, Wouter, additional, Verellen, Niels, additional, Chen, Xianmei, additional, Hofkens, Johan, additional, Van Tendeloo, Gustaaf, additional, and Moshchalkov, Victor V., additional

Published
2015
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27. Prevalence and risk factors of Helicobacter pylori infection in Ningxia, China: comparison of two cross-sectional studies from 2017 and 2022.

Author

Zhou Y, Deng Y, You Y, Li X, Zhang D, Qi H, Shi R, Yao L, Tang Y, Li X, Ma L, Li Y, Liu J, Feng Y, Chen X, Hao Q, Li X, Li Y, Niu M, Gao H, Bai F, and Hu S

Abstract

Objectives: Helicobacter pylori ( H. pylori ) infection causes a variety of intragastric and extragastric diseases. Despite its decreasing global prevalence, it remains a major public health problem in many developing countries. This study aimed to understand the prevalence of H. pylori infection and its risk factors in five cities of the Ningxia Hui Autonomous Region, an area with high incidence of gastric cancer., Methods: Cross-sectional studies were conducted in Ningxia from 2017 and 2022, to detect the prevalence of H. pylori using the 14 C urea breath test. All participants completed a questionnaire that included demographics, personal habits, household economic characteristics, and previous health status. Multiple logistic regression analyses were used to identify independent factors for H. pylori infection., Results: Our findings demonstrated that the prevalence of H. pylori infection in Ningxia decreased significantly from 60.3% in 2017 to 43.6% in 2022, with an increase in public awareness rate from 35.9% in 2017 to 68.5% in 2022. The lowest infection rate was found in Zhongwei and highest in Guyuan. The prevalence of H. pylori infection was higher among Hui ethnicity, farmers, individuals living in rural areas, individuals with lower income, low education, and those who consumed less fruit. Gallbladder, respiratory, cardiovascular and autoimmune diseases were not associated with H. pylori infection., Conclusions: The prevalence of H. pylori in Ningxia decreased in the past five years. Ethnicity, location, occupation, income, education, and consumption of fruits were independent risk factors for H. pylori infection in Ningxia. It was not associated with extra-gastric disease., Competing Interests: None., (AJTR Copyright © 2022.)

Published
2022

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