1
|
Du W, Li Y, Shen FH, Jiang XH, Tian JR, Fan HM. [Effects of heat exposure and vitamin C intervention on oxidative stress and blood pressure changes in treadmill rats]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2023; 41:112-117. [PMID: 36882274 DOI: 10.3760/cma.j.cn121094-20211217-00621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
Objective: To investigate the effect of oxidative stress caused by heat exposure on the blood pressure increase of treadmill rats and the intervention of antioxidants. Methods: In June 2021, Twenty-four healthy SD male rats were randomly divided into four groups: normal temperature feeding, normal temperature treadmill, high temperature treadmill and high temperature treadmill supplementation with vitamin C groups, 6 rats in each group. The rats run on the platform in normal temperature or heat exposure environment for 30 min in the morning and in the afternoon daily, 6 days per week. The daily vitamin C supplement dose of high temperature treadmill supplementation with vitamin C group was 10 mg/kg. BP recordings were done at the end of the week. The rat vascular lipofuscin (LF) was detected by ELISA, the rat serum nitric oxide (NO) was detected by nitrate reductase method, the serum malondialdehyde (MDA) was detected by thibabituric acid method, the serum glutathione peroxidase (GPx) and superoxide dismutase (SOD) were detected by chemiluminescence method, and the serum catalase (CAT) was detected by ammonium molybdate method. The total antioxidant capacity (T-AOC) of serum was measured by iron reduction/antioxidant capacity method, and the content of nuclear erythroid 2-related factor 2 (Nrf2) in vascular tissue was measured by Western blot. The intra-group mean was compared by repeated measurement analysis of variance, and the inter-group mean was compared by single-factor analysis of variance and post-event LSD-t test. Results: Compared with the previous time point, the systolic BP and diastolic BP of the high temperature treadmill group were significantly increased at 7, 14 and 21 d, and decreased at 28 d which were higher than the initial level (P<0.05), and the systolic BP and diastolic BP values at each experimental time point were significantly higher than those of normal temperature treadmill group (P<0.001). The changes of thickening of the artery wall, no smoothing of the endodermis and irregular arrangement of muscle cells in high temperature treadmill group were observed. Compared with the normal temperature treadmill group, the content of MDA in serum, and LF in vascular tissue were significantly increased, the activities of SOD, CAT, T-AOC, the content of NO in serum, and the expression of Nrf2 in vascular tissue were significantly decreased in high temperature treadmill group (P<0.05). Compared with the high temperature treadmill group, the systolic BP and diastolic BP values at 7, 14, 21 and 28 d, the content of serum MDA and LF in vascular tissue were significantly decreased, the activities of CAT and T-AOC, and the expression of Nrf2 in vascular tissue significantly increased (P<0.05), the histopathological changes of the artery wall improved in high temperature treadmill supplementation with vitamin C group. Conclusion: Heat exposure has effect on oxidative stress, which may be related to the increase of BP. Vitamin C as an anti-oxidative enhancer can prevent those negative effects, which could alleviate the pathological changes of vessel intima in heat-exposed rats. And the Nrf2 may be a regulated factor to vascular protection.
Collapse
Affiliation(s)
- W Du
- School of Public Health, North China University of Science and Technology, Tangshan 063210, China
| | - Y Li
- School of Public Health, North China University of Science and Technology, Tangshan 063210, China
| | - F H Shen
- School of Public Health, North China University of Science and Technology, Tangshan 063210, China
| | - X H Jiang
- School of Basic Medical Sciences, North China University of Science and Technology, Tangshan 063210, China
| | - J R Tian
- School of Basic Medical Sciences, North China University of Science and Technology, Tangshan 063210, China
| | - H M Fan
- School of Public Health, North China University of Science and Technology, Tangshan 063210, China
| |
Collapse
|
2
|
Mitchell AL, Ovadia C, Syngelaki A, Souretis K, Martineau M, Girling J, Vasavan T, Fan HM, Seed PT, Chambers J, Walters J, Nicolaides K, Williamson C. Re-evaluating diagnostic thresholds for intrahepatic cholestasis of pregnancy: case-control and cohort study. BJOG 2021; 128:1635-1644. [PMID: 33586324 DOI: 10.1111/1471-0528.16669] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/12/2021] [Indexed: 12/27/2022]
Abstract
OBJECTIVE To determine the optimal total serum bile acid (TSBA) threshold and sampling time for accurate intrahepatic cholestasis of pregnancy (ICP) diagnosis. DESIGN Case-control, retrospective cohort studies. SETTING Antenatal clinics, clinical research facilities. POPULATION Women with ICP or uncomplicated pregnancies. METHODS Serial TSBA measurements were performed pre-/postprandially in 42 women with ICP or uncomplicated pregnancy. Third-trimester non-fasting TSBA reference ranges were calculated from 561 women of black, south Asian and white ethnicity. Rates of adverse perinatal outcomes for women with ICP but peak non-fasting TSBA below the upper reference range limit were compared with those in healthy populations. MAIN OUTCOME MEASURES Sensitivity and specificity of common TSBA thresholds for ICP diagnosis, using fasting and postprandial TSBA. Calculation of normal reference ranges of non-fasting TSBA. RESULTS Concentrations of TSBA increased markedly postprandially in all groups, with overlap between healthy pregnancy and mild ICP (TSBA <40 μmol/l). The specificity of ICP diagnosis was higher when fasting, but corresponded to <30% sensitivity for diagnosis of mild disease. Using TSBA ≥40 μmol/l to define severe ICP, fasting measurements identified 9% (1/11), whereas non-fasting measurements detected over 91% with severe ICP. The highest upper limit of the non-fasting TSBA reference range was 18.3 µmol/l (95% confidence interval: 15.0-35.6 μmol/l). A re-evaluation of published ICP meta-analysis data demonstrated no increase in spontaneous preterm birth or stillbirth in women with TSBA <19 µmol/l. CONCLUSIONS Postprandial TSBA levels are required to identify high-risk ICP pregnancies (TSBA ≥40 μmol/l). The postprandial rise in TSBA in normal pregnancy indicates that a non-fasting threshold of ≥19 µmol/l would improve diagnostic accuracy. TWEETABLE ABSTRACT Non-fasting bile acids improve the diagnostic accuracy of intrahepatic cholestasis of pregnancy diagnosis.
Collapse
Affiliation(s)
- A L Mitchell
- Department of Women and Children's Health, King's College London, Guy's Campus, London, UK
| | - C Ovadia
- Department of Women and Children's Health, King's College London, Guy's Campus, London, UK
| | - A Syngelaki
- Harris Birthright Research Centre for Fetal Medicine, Fetal Medicine Research Institute, King's College Hospital, London, UK
| | - K Souretis
- Harris Birthright Research Centre for Fetal Medicine, Fetal Medicine Research Institute, King's College Hospital, London, UK
| | - M Martineau
- Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Campus, London, UK
| | - J Girling
- Obstetrics and Gynaecology Department, West Middlesex University Hospital, Middlesex, UK
| | - T Vasavan
- Department of Women and Children's Health, King's College London, Guy's Campus, London, UK
| | - H M Fan
- Department of Women and Children's Health, King's College London, Guy's Campus, London, UK
| | - P T Seed
- Department of Women and Children's Health, King's College London, St Thomas' Campus, London, UK
| | - J Chambers
- Women's Health Research Centre, Imperial College London, London, UK
| | - Jrf Walters
- Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Campus, London, UK
| | - K Nicolaides
- Harris Birthright Research Centre for Fetal Medicine, Fetal Medicine Research Institute, King's College Hospital, London, UK
| | - C Williamson
- Department of Women and Children's Health, King's College London, Guy's Campus, London, UK
| |
Collapse
|
3
|
Qin ZW, Su YJ, Wang HT, Zhu HR, Zhang XT, Li C, Li XM, Wang ZY, Yuan JX, Fan HM. [A case-control study on effect of occupational factor exposures on carotid atherosclerosis in steel workers]. Zhonghua Liu Xing Bing Xue Za Zhi 2020; 41:1836-1842. [PMID: 33297648 DOI: 10.3760/cma.j.cn112338-20190916-00677] [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] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effect of occupational factor exposures on carotid atherosclerosis (CAS) in steel workers. Methods: A frequency matched case-control study was conducted by age and factory proportion. A total of 1 033 workers with carotid atherosclerosis diagnosed by ultrasonography examination from February to June 2017 were selected as case group, and 1 033 workers without carotid atherosclerosis indicated by physical examination at the same time were selected as control group. The basic information of the workers, such as diet pattern, lifestyle, serum biochemical index and occupation history, were collected. The effects of occupational hazards on carotid atherosclerosis were analyzed by univariate and multivariate logistic regression analyses. The combined effects of various occupational hazards on carotid atherosclerosis were evaluated by environmental risk score (ERS). Results: High temperature, noise, occupational stress and night shift days increased the risk of CAS. With the increase of cumulative high temperature and noise exposure, occupational stress and night shift days, the risk of CAS increased (trend text: χ(2)=37.53, P<0.01; χ(2)=16.98, P<0.01; χ(2)=13.93, P<0.01; χ(2)=5.59, P<0.05). After adjustment of covariates, compared with P(20) group, the risk of carotid artery in P(40), P(60), P(80) and P(100) groups were as follows: high temperature 1.61 (1.19-2.18), 1.69 (1.25-2.30), 1.84 (1.36-2.49), 2.43 (1.77-3.34); noise 1.70 (1.15-2.52), 1.68 (1.20-2.35), 1.80 (1.34-2.42), 2.23 (1.53-3.26); occupational stress 1.39 (1.04- 1.86), 1.41 (1.06-1.89), 1.45(1.09-1.95), 1.48 (1.10-1.98); night shift days 1.58 (1.08-2.33), 1.66 (1.12-2.47), 1.55 (1.04-2.31), 1.76 (1.17-2.64). The results of the environmental risk score showed that the risk of carotid atherosclerosis increased with the increase of ERS (ERS trend text χ(2)=51.61, P<0.01); RCS results showed that there was a linear relationship between ERS and CAS in steel workers(P<0.01). Linear dose-response relationship existed between ERS and CAS (nonlinear test P>0.05). Conclusions: High temperature, noise, occupational stress and night shift days were related to carotid atherosclerosis. Linear dose-response relationship existed between ERS and CAS in steel workers.
Collapse
Affiliation(s)
- Z W Qin
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| | - Y J Su
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| | - H T Wang
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| | - H R Zhu
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| | - X T Zhang
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| | - C Li
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| | - X M Li
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| | - Z Y Wang
- Tangshan Hongci Hospital, Tangshan 063000, China
| | - J X Yuan
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| | - H M Fan
- School of Public Health, North China of Science and Technology University, Tangshan 063210, China; Hebei Provincial Coal and Safety Key Laboratory, Tangshan 063000, China
| |
Collapse
|
4
|
Wang XH, Lin JN, Liu GZ, Fan HM, Huang YP, Li CJ, Yan HY. Women Are at a Higher Risk of Chronic Metabolic Diseases Compared to Men With Increasing Body Mass Index in China. Front Endocrinol (Lausanne) 2020; 11:127. [PMID: 32226411 PMCID: PMC7080650 DOI: 10.3389/fendo.2020.00127] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 02/26/2020] [Indexed: 02/06/2023] Open
Abstract
Background: Chronic non-communicable diseases are the major causes of mortality in the world. However, few studies have investigated the association between multi-categories BMI and chronic diseases from perspective of sex stratification. This study aimed to investigate the risk of chronic diseases at different BMI levels, and to further explore whether BMI-health risk associations differ by sex. Methods: In total, 21,134 participants aged 19-65 years (60.4% men) from the Tianjin People's Hospital, Tianjin Union Medical Center-Health Management Center were recruited for this cross-sectional study. Sex-specific percentiles of BMI were calculated and divided into 11 categories according to the 2000 CDC growth charts. Health-related indicators, such as hyperglycemia, hypertension, non-alcoholic fatty liver diseases (NAFLD), hyperuricemia, etc., were used as dependent variables in this study. Statistical differences were tested by unpaired Mann-Whitney U-test and chi-squared test. Logistic regression models were used to examine the associations between BMI and health-related indicators. Results: The risk of hyperglycemia (OR: 1.67, 95%CI: 1.23-2.29), NAFLD (OR: 2.22, 95%CI: 1.74-2.85), hypertriglyceridemia (OR: 1.65, 95%CI: 1.28-2.12), and hyperuricemia (OR: 1.39, 95%CI: 1.12-1.72) in men began to increase significantly when BMI was in the range of 22.59-23.89 kg/m2. However, in women, the risk of hyperglycemia (OR: 3.02, 95%CI: 1.25-8.98) and hyperuricemia (OR: 1.94, 95%CI: 1.26-3.05) began to increase significantly when BMI was in the range of 22.76-23.62 kg/m2, and the risk of NAFLD (OR: 5.48, 95%CI: 2.49-14.47) began to increase significantly when BMI was in the range of 21.08-21.97 kg/m2. Besides, at the same BMI level, the risk of diseases in women were significantly higher than that in men, especially when BMI > 25 kg/m2. Conclusion: In the Chinese population, the risk of chronic diseases in women were significantly higher than that in men at the same BMI level, especially when BMI was >25 kg/m2. In addition, the risk of chronic diseases began to increase significantly when BMI was >21.97 kg/m2 in women and 23.89 kg/m2 in men. The results indicated that women should be more alert to the risk of chronic diseases caused by the increase of BMI than men.
Collapse
Affiliation(s)
- Xiao-He Wang
- College of Public Health, Hebei University, Baoding, China
| | - Jing-Na Lin
- Department of Endocrinology, Health Management Center, Tianjin Union Medical Center, Nankai University Affiliated Hospital, Tianjin, China
| | | | - Hai-Ming Fan
- Tianjin Municipal Health Commission, Tianjin, China
| | | | - Chun-Jun Li
- Department of Endocrinology, Health Management Center, Tianjin Union Medical Center, Nankai University Affiliated Hospital, Tianjin, China
- *Correspondence: Chun-Jun Li
| | - Hong-Yuan Yan
- College of Public Health, Hebei University, Baoding, China
- Hong-Yuan Yan
| |
Collapse
|
5
|
Liu XL, Chen S, Zhang H, Zhou J, Fan HM, Liang XJ. Magnetic Nanomaterials for Advanced Regenerative Medicine: The Promise and Challenges. Adv Mater 2019; 31:e1804922. [PMID: 30511746 DOI: 10.1002/adma.201804922] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 09/24/2018] [Indexed: 06/09/2023]
Abstract
The recent emergence of numerous nanotechnologies is expected to facilitate the development of regenerative medicine, which is a tissue regeneration technique based on the replacement/repair of diseased tissue or organs to restore the function of lost, damaged, and aging cells in the human body. In particular, the unique magnetic properties and specific dimensions of magnetic nanomaterials make them promising innovative components capable of significantly advancing the field of tissue regeneration. Their potential applications in tissue regeneration are the focus here, beginning with the fundamentals of magnetic nanomaterials. How nanomaterials-both those that are intrinsically magnetic and those that respond to an externally applied magnetic field-can enhance the efficiency of tissue regeneration is also described. Applications including magnetically controlled cargo delivery and release, real-time visualization and tracking of transplanted cells, magnetic regulation of cell proliferation/differentiation, and magnetic activation of targeted ion channels and signal pathways involved in regeneration are highlighted, and comments on the perspectives and challenges in magnetic nanomaterial-based tissue regeneration are given.
Collapse
Affiliation(s)
- Xiao-Li Liu
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, No. 11, First North Road, Zhongguancun, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Shizhu Chen
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, No. 11, First North Road, Zhongguancun, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of the Ministry of Education, Hebei University, Baoding, 071002, P. R. China
| | - Huan Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, P. R. China
| | - Jin Zhou
- Tissue Engineering Research Center of the Academy of Military Medical Sciences, No. 27, Taiping Road, Haidian District, Beijing, 100850, P. R. China
| | - Hai-Ming Fan
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, P. R. China
| | - Xing-Jie Liang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, No. 11, First North Road, Zhongguancun, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| |
Collapse
|
6
|
Wen LY, Yang ZG, Li ZL, Ai H, Xia CC, Zhang LZ, Lin BB, Zhang K, Fu H, Wu CQ, Yang L, Fan HM, Guo YK. Accurate identification of myocardial viability after myocardial infarction with novel manganese chelate-based MR imaging. NMR Biomed 2019; 32:e4158. [PMID: 31393647 DOI: 10.1002/nbm.4158] [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] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 06/17/2019] [Accepted: 07/02/2019] [Indexed: 02/05/2023]
Abstract
We developed a novel manganese (Mn2+ ) chelate for magnetic resonance imaging (MRI) assessment of myocardial viability in acute and chronic myocardial infarct (MI) models, and compared it with Gadolinium-based delay enhancement MRI (Gd3+ -DEMRI) and histology. MI was induced in 14 rabbits by permanent occlusion of the left circumflex coronary artery. Gd3+ -DEMRI and Mn2+ chelate-based delayed enhancement MRI (Mn2+ chelate-DEMRI) were performed at 7 days (acute MI, n = 8) or 8 weeks (chronic MI, n = 6) after surgery with sequential injection of 0.15 mmol/kg Gd3+ and Mn2+ chelate. The biodistribution of Mn2+ in tissues and blood was measured at 1.5 and 24 h. Blood pressure, heart rate (HR), left ventricular (LV) function, and infarct fraction (IF) were analyzed, and IF was compared with the histology. The Mn2+ chelate group maintained a stable hemodynamic status during experiment. For acute and chronic MI, all rabbits survived without significant differences in HR or LV function before and after injection of Mn2+ chelate or Gd3+ (p > 0.05). Mn2+ chelate mainly accumulated in the kidney, liver, spleen, and heart at 1.5 h, with low tissue uptake and urine residue at 24 h after injection. In the acute MI group, there was no significant difference in IF between Mn2+ chelate-DEMRI and histology (22.92 ± 2.21% vs. 21.79 ± 2.25%, respectively, p = 0.87), while Gd3+ -DEMRI overestimated IF, as compared with histology (24.54 ± 1.73%, p = 0.04). In the chronic MI group, there was no significant difference in IF between the Mn2+ chelate-DEMRI, Gd3+ -DEMRI, and histology (29.50 ± 11.39%, 29.95 ± 9.40%, and 29.00 ± 10.44%, respectively, p > 0.05), and all three were well correlated (r = 0.92-0.96, p < 0.01). We conclude that the use of Mn2+ chelate-DEMRI is reliable for MI visualization and identifies acute MI more accurately than Gd3+ -DEMRI.
Collapse
Affiliation(s)
- Ling-Yi Wen
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, China
| | - Zhi-Gang Yang
- Department of Radiology, West China Hospital, Sichuan University, China
| | - Zhen-Lin Li
- Department of Radiology, West China Hospital, Sichuan University, China
| | - Hua Ai
- National Engineering Research Center for Biomaterials, Sichuan University, China
| | - Chun-Chao Xia
- Department of Radiology, West China Hospital, Sichuan University, China
| | - Li-Zhi Zhang
- Department of Radiology, West China Hospital, Sichuan University, China
| | - Bin-Bin Lin
- National Engineering Research Center for Biomaterials, Sichuan University, China
| | - Kun Zhang
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, China
| | - Hang Fu
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, China
| | - Chang-Qiang Wu
- Sichuan Key Laboratory of Medical Imaging and School of Medical Imaging, North Sichuan Medical College, China
| | - Li Yang
- National Engineering Research Center for Biomaterials, Sichuan University, China
| | - Hai-Ming Fan
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, China
| | - Ying-Kun Guo
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, China
| |
Collapse
|
7
|
Luo JW, Liu C, Wu JH, Lin LX, Fan HM, Zhao DH, Zhuang YQ, Sun YL. In situ injectable hyaluronic acid/gelatin hydrogel for hemorrhage control. Materials Science and Engineering: C 2019; 98:628-634. [DOI: 10.1016/j.msec.2019.01.034] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 12/23/2018] [Accepted: 01/08/2019] [Indexed: 12/26/2022]
|
8
|
Cao H, Ji TW, Lan Q, Lin F, Dong Y, Xu AJ, Liu J, Ding HY, Fan HM, Liu ZM. [Establishment of rat model of cardiorenal syndrome by transabdominal subtotal nephrectomy]. Zhonghua Yi Xue Za Zhi 2019; 99:447-452. [PMID: 30786340 DOI: 10.3760/cma.j.issn.0376-2491.2019.06.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To evaluate the changes of rat renal function and cardiac function after transabdominal subtotal nephrectomy (STNx) and provide an ideal animal model for the study of chronic kidney disease (CKD) and cardiorenal syndrome (CRS). Methods: The SD rats (male, 5-6 weeks) were randomly divided into Sham group (n=10) and STNx group (n=10). The rats from Sham group underwent sham surgery, and the right nephrectomy plus the 2/3 left kidney artery ligation through abdominal incision were performed in the rats from STNx group. Twelve weeks after operation, the rat serum creatinine and renal pathology were examined, the size and fibrosis of cardiac cells were also observed, after the changes of cardiac function being detected by echocardiography. Results: Twelve weeks after the operation, STNx group rats were generally in poor condition, with a emaciated body, absorption of the renal infarct tissue, uneven surface, and residual renal tissue compensatory hypertrophy. The serum creatinine in Sham group and STNx group was (22.10±1.64) μmol/L and (52.80±3.34) μmol/L, respectively, and there was a statistically significant difference between the two groups (P<0.001). Compared with Sham group, the echocardiography results demonstrated that the thickness of left ventricular wall of rats from STNx group increased, the left ventricular volume decreased, and the diastolic and systolic function of left ventricular descended. The HE staining showed that the glomerulus, tubules and interstitial renal morphology were normal in Sham group, and glomerular sclerosis was observed in STNx group. And the Masson staining declared that the renal fibrous tissue distribution was normal in Sham group, and severe renal interstitial fibrosis was observed in STNx group. The wheat germ agglutinin (WGA) staining of myocardial tissue showed that myocardial cells in STNx group were larger than those in Sham group (1.293±0.060 vs 1.000±0.059, P<0.001). Moreover, the HE staining showed that there was partial myocardial tissue necrosis and fibrosis in STNx group, and severe myocardial fibrosis was observed in STNx group by Masson staining. Conclusion: Similar pathophysiological changes in human CKD were observed in the rats CKD model by transabdominal STNx, and the cardiac effects of this model make it an ideal choice to study CRS.
Collapse
Affiliation(s)
- H Cao
- Department of Cardiovascular Surgery, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - T W Ji
- Department of Cardiovascular Surgery, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Q Lan
- Shanghai Institute of Heart Failure, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - F Lin
- Shanghai Institute of Heart Failure, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Y Dong
- Department of Echocardiography, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - A J Xu
- Department of Cardiovascular Surgery, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - J Liu
- Department of Cardiovascular Surgery, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - H Y Ding
- Department of Cardiovascular Surgery, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - H M Fan
- Shanghai Institute of Heart Failure, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Z M Liu
- Department of Cardiovascular Surgery, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| |
Collapse
|
9
|
Xiao MY, Wang ZY, Fan HM, Che CL, Lu Y, Cong LX, Gao XJ, Liu YJ, Yuan JX, Li XM, Hu B, Chen YP. [Relationship between shift work and overweight/obesity in male steel workers]. Zhonghua Liu Xing Bing Xue Za Zhi 2017; 37:1468-1472. [PMID: 28057136 DOI: 10.3760/cma.j.issn.0254-6450.2016.11.007] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the relationship between shift work and overweight/obesity in male steel workers. Methods: A questionnaire survey was conducted among the male steel workers selected during health examination in Tangshan Steel Company from March 2015 to March 2016. The relationship between shift work and overweight/obesity in the male steel workers were analyzed by using logistic regression model and restricted cubic splinemodel. Results: A total of 7 262 male steel workers were surveyed, the overall prevalence of overweight/obesitywas 64.5% (4 686/7 262), the overweight rate was 34.3% and the obesity rate was 30.2%, respectively. After adjusting for age, educational level and average family income level per month by multivariable logistic regression analysis, shift work was associated with overweight/obesity and obesity in the male steel workers. The OR was 1.19(95% CI: 1.05-1.35) and 1.15(95% CI: 1.00-1.32). Restricted cubic spline model analysis showed that the relationship between shift work years and overweight/obesity in the male steel workers was a nonlinear dose response one (nonlinear test χ2=7.43, P<0.05). Restricted cubic spline model analysis showed that the relationship between shift work years and obesity in the male steel workers was a nonlinear dose response one (nonlinear test χ2=10.48, P<0.05). Conclusion: Shift work was associated with overweight and obesity in the male steel workers, and shift work years and overweight/obesity had a nonlinear relationship.
Collapse
Affiliation(s)
- M Y Xiao
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - Z Y Wang
- Tangshan Hong Kindness Hospital, Tangshan 063000, China
| | - H M Fan
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - C L Che
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - Y Lu
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - L X Cong
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - X J Gao
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - Y J Liu
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - J X Yuan
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - X M Li
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - B Hu
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| | - Y P Chen
- Coal Occupational Health and Safety Laboratory of Hebei Province, School of Public Health, North China University of Science and Technology, Tangshan 063000, China
| |
Collapse
|
10
|
Wang J, Cao H, Hong X, Chen GH, Fan HM, Li QC, Liu ZM, Li KF. MicroRNA screening and functional study of obliterative bronchiolitis in a rat model simulating lung transplantation. Genet Mol Res 2015; 14:19309-16. [PMID: 26782583 DOI: 10.4238/2015.december.29.40] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
The aim of this study was to provide the experimental basis for effective prevention and treatment of obliterative bronchiolitis (OB) by studying the changes on the microRNA (miRNA) expression profile after an orthotopic tracheal transplantation (OTT) simulating lung transplantation (LT). The OTT was performed on inbred rats to establish an OB animal model simulating LT, which was confirmed successful through pathological examination after 4 weeks. A miRNA microarray was used to screen for the most significantly differentially expressed miRNA in the OB tissues of donor transplanted trachea and real-time quantitative PCR was then used to validate the reliability of the microarray results. The microarray detection obtained 29 OB-related miRNAs, composed of 15 and 14 significantly up- and down-regulated miRNAs, respectively, among which miR-146a, miR-155, and miR-451, whose function is involved in the immune and inflammatory reactions, were subjected to relative quantitation research. The LT-simulated OTT-induced OB showed significantly differential expressions of multiple miRNAs, among which miR-146a and miR-155 were highly expressed, while miR-451 was lowly expressed, suggesting that these miRNAs may play an important regulatory role in the OB pathological process after LT.
Collapse
Affiliation(s)
- J Wang
- Department of Cardiovascular and Thoracic Surgery, Shanghai East Hospital Affiliated to Tongji University, Shanghai, China
| | - H Cao
- Department of Cardiovascular and Thoracic Surgery, Shanghai East Hospital Affiliated to Tongji University, Shanghai, China
| | - X Hong
- Department of Cardiovascular and Thoracic Surgery, Shanghai East Hospital Affiliated to Tongji University, Shanghai, China
| | - G H Chen
- Department of Cardiovascular and Thoracic Surgery, Shanghai East Hospital Affiliated to Tongji University, Shanghai, China
| | - H M Fan
- Department of Cardiovascular and Thoracic Surgery, Shanghai East Hospital Affiliated to Tongji University, Shanghai, China
| | - Q C Li
- Department of Cardiovascular and Thoracic Surgery, Shanghai East Hospital Affiliated to Tongji University, Shanghai, China
| | - Z M Liu
- Department of Cardiovascular and Thoracic Surgery, Shanghai East Hospital Affiliated to Tongji University, Shanghai, China
| | - K F Li
- Department of Cardiovascular and Thoracic Surgery, Shanghai East Hospital Affiliated to Tongji University, Shanghai, China
| |
Collapse
|
11
|
|
12
|
Lee KK, Deng S, Fan HM, Mhaisalkar S, Tan HR, Tok ES, Loh KP, Chin WS, Sow CH. α-Fe2O3 nanotubes-reduced graphene oxide composites as synergistic electrochemical capacitor materials. Nanoscale 2012; 4:2958-61. [PMID: 22441701 DOI: 10.1039/c2nr11902a] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We present a facile approach for the fabrication of a nanocomposite comprising α-Fe(2)O(3) nanotubes (NTs) anchored on reduced graphene oxide (rGO) for electrochemical capacitors (ECs). The hollow tubular structure of the α-Fe(2)O(3) NTs presents a high surface area for reaction, while the incorporation of rGO provides an efficient two-dimensional conductive pathway to allow fast, reversible redox reaction. As a result, the nanocomposite materials exhibit a specific capacitance which is remarkably higher (~7 times) than α-Fe(2)O(3) NTs alone. In addition, the nanocomposites show excellent cycling life and large negative potential window. These findings suggest that such nanocomposites are a promising candidate as negative electrodes in asymmetrical capacitors with neutral electrolytes.
Collapse
Affiliation(s)
- K K Lee
- NUS Nanoscience and Nanotechnology Initiative, Block S13, 2 Science Drive 3, Singapore 117542
| | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Zhu HT, Luo J, Fan HM, Zhang H, Liang JK, Rao GH, Li JB, Liu GY, Du ZM. Tri-wing bismuth telluride nanoribbons with quasi-periodic rough surfaces. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11715g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
14
|
Fan HM, Olivo M, Shuter B, Yi JB, Bhuvaneswari R, Tan HR, Xing GC, Ng CT, Liu L, Lucky SS, Bay BH, Ding J. Quantum Dot Capped Magnetite Nanorings as High Performance Nanoprobe for Multiphoton Fluorescence and Magnetic Resonance Imaging. J Am Chem Soc 2010; 132:14803-11. [DOI: 10.1021/ja103738t] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hai-Ming Fan
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Malini Olivo
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Borys Shuter
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Jia-Bao Yi
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Ramaswamy Bhuvaneswari
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Hui-Ru Tan
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Gui-Chuan Xing
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Cheng-Teng Ng
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Lei Liu
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Sasidharan S. Lucky
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Boon-Huat Bay
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| | - Jun Ding
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore, National University of Ireland, University Road, Galway, Ireland, Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore, Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, 02-02 Helios, 138667, Singapore, Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, 119074, Singapore,
| |
Collapse
|
15
|
Yi JB, Lim CC, Xing GZ, Fan HM, Van LH, Huang SL, Yang KS, Huang XL, Qin XB, Wang BY, Wu T, Wang L, Zhang HT, Gao XY, Liu T, Wee ATS, Feng YP, Ding J. Ferromagnetism in dilute magnetic semiconductors through defect engineering: Li-doped ZnO. Phys Rev Lett 2010; 104:137201. [PMID: 20481907 DOI: 10.1103/physrevlett.104.137201] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Revised: 01/07/2010] [Indexed: 05/26/2023]
Abstract
We demonstrate, both theoretically and experimentally, that cation vacancy can be the origin of ferromagnetism in intrinsic dilute magnetic semiconductors. The vacancies can be controlled to tune the ferromagnetism. Using Li-doped ZnO as an example, we found that while Li itself is nonmagnetic, it generates holes in ZnO, and its presence reduces the formation energy of Zn vacancy, and thereby stabilizes the zinc vacancy. Room temperature ferromagnetism with p type conduction was observed in pulsed laser deposited ZnO:Li films with certain doping concentration and oxygen partial pressure.
Collapse
Affiliation(s)
- J B Yi
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Fan XF, Liu L, Wu RQ, Peng GW, Fan HM, Feng YP, Kuo JL, Shen ZX. The role of sp-hybridized atoms in carbon ferromagnetism: a spin-polarized density functional theory calculation. J Phys Condens Matter 2010; 22:046001. [PMID: 21386325 DOI: 10.1088/0953-8984/22/4/046001] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We address the room-temperature (RT) carbon ferromagnetism by considering the magnetic states of low-dimensional carbons linked by sp-hybridized carbon atoms. Based on the spin-polarized density functional theory calculations, we find that the sp(*) orbitals of carbon atoms can bring magnetic moments into different carbon allotropes which may eventually give rise to the long-range ferromagnetic ordering at room temperature through an indirect carrier-mediated coupling mechanism. The fact that this indirect coupling is Fermi-level-dependent predicts that the individual magnetism of diverse carbon materials is governed by their chemical environments. This mechanism may help to illuminate the RT magnetic properties of carbon-based materials and to explore the new magnetic applications of carbon materials.
Collapse
Affiliation(s)
- X F Fan
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
| | | | | | | | | | | | | | | |
Collapse
|
17
|
Deng SZ, Fan HM, Wang M, Zheng MR, Yi JB, Wu RQ, Tan HR, Sow CH, Ding J, Feng YP, Loh KP. Thiol-capped ZnO nanowire/nanotube arrays with tunable magnetic properties at room temperature. ACS Nano 2010; 4:495-505. [PMID: 20028113 DOI: 10.1021/nn901353x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The present study reports room-temperature ferromagnetic behaviors in three-dimensional (3D)-aligned thiol-capped single-crystalline ZnO nanowire (NW) and nanotube (NT) arrays as well as polycrystalline ZnO NT arrays. Besides the observation of height-dependent saturation magnetization, a much higher M(s) of 166 microemu cm(-2) has been found in NTs compared to NWs (36 microemu cm(-2)) due to larger surface area in ZnO NTs, indicating morphology-dependent magnetic properties in ZnO NW/NT systems. Density functional calculations have revealed that the origin of ferromagnetism is mainly attributed to spin-polarized 3p electrons in S sites and, therefore, has a strong correlation with Zn-S bond anisotropy. The preferential magnetization direction of both single-crystalline NTs and NWs lies perpendicular to the tube/wire axis due to the aligned high anisotropy orientation of the Zn-S bonds on the lateral (100) face of ZnO NWs and NTs. Polycrystalline ZnO NTs, however, exhibit a preferential magnetization direction parallel to the tube axis which is ascribed to shape anisotropy dominating the magnetic response. Our results demonstrate the interplay of morphology, dimensions, and crystallinity on spin alignment and magnetic anisotropy in a 3D semiconductor nanosystem with interfacial magnetism.
Collapse
Affiliation(s)
- Su-Zi Deng
- Department of Chemistry, National University of Singapore, Singapore
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Fan HM, Yi JB, Yang Y, Kho KW, Tan HR, Shen ZX, Ding J, Sun XW, Olivo MC, Feng YP. Single-crystalline MFe(2)O(4) nanotubes/nanorings synthesized by thermal transformation process for biological applications. ACS Nano 2009; 3:2798-808. [PMID: 19711908 DOI: 10.1021/nn9006797] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We report a general thermal transformation approach to synthesize single-crystalline magnetic transition metal oxides nanotubes/nanorings including magnetite Fe(3)O(4), maghematite gamma-Fe(2)O(3), and ferrites MFe(2)O(4) (M = Co, Mn, Ni, Cu) using hematite alpha-Fe(2)O(3) nanotubes/nanorings template. While the straightforward reduction or reduction-oxides process was employed to produce Fe(3)O(4) and gamma-Fe(2)O(3), the alpha-Fe(2)O(3)/M(OH)(2) core/shell nanostructure was used as precursor to prepare MFe(2)O(4) nanotubes via MFe(2)O(4-x) (0 < x < 1) intermediate. The transformed ferrites nanocrystals retain the hollow structure and single-crystalline nature of the original templates. However, the crystallographic orientation-relationships of cubic spinel ferrites and trigonal hematite show strong correlation with their morpologies. The hollow-structured MFe(2)O(4) nanocrystals with tunable size, shape, and composition have exhibited unique magnetic properties. Moreover, they have been demonstrated as a highly effective peroxidase mimic catalysts for laboratory immunoassays or as a universal nanocapsules hybridized with luminescent QDs for magnetic separation and optical probe of lung cancer cells, suggesting that these biocompatible magnetic nanotubes/nanorings have great potential in biomedicine and biomagnetic applications.
Collapse
Affiliation(s)
- Hai-Ming Fan
- Department of Physics, National University of Singapore, 2 Science Drive 3, 117542 Singapore.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Deng S, Fan HM, Zhang X, Loh KP, Cheng CL, Sow CH, Foo YL. An effective surface-enhanced Raman scattering template based on a Ag nanocluster-ZnO nanowire array. Nanotechnology 2009; 20:175705. [PMID: 19420600 DOI: 10.1088/0957-4484/20/17/175705] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
An effective surface-enhanced Raman scattering (SERS) template based on a 3D hybrid Ag nanocluster (NC)-decorated ZnO nanowire array was fabricated through a simple process of depositing Ag NCs on ZnO nanowire arrays. The effects of particle size and excitation energy on the Raman scattering in these hybrid systems have been investigated using rhodamine 6G as a standard analyte. The results indicate that the hybrid nanosystem with 150 nm Ag NCs produces a larger SERS enhancement factor of 3.2 x 10(8), which is much higher than that of 10 nm Ag NCs (6.0 x 10(6)) under 532 nm excitation energy. The hybrid nanowire arrays were further applied to obtain SERS spectra of the two-photon absorption (TPA) chromophore T7. Finite-difference time-domain simulations reveal the presence of an enhanced field associated with inter-wire plasmon coupling of the 150 nm Ag NCs on adjacent ZnO nanowires; such a field was absent in the case of the 10 nm Ag NC-coated ZnO nanowire. Such hybrid nanosystems could be used as SERS substrates more effectively than assembled Ag NC film due to the enhanced light-scattering local field and the inter-wire plasmon-enhanced electromagnetic field.
Collapse
Affiliation(s)
- S Deng
- Department of Chemistry, National University of Singapore, Singapore
| | | | | | | | | | | | | |
Collapse
|
20
|
Ni ZH, Wang HM, Kasim J, Fan HM, Yu T, Wu YH, Feng YP, Shen ZX. Graphene thickness determination using reflection and contrast spectroscopy. Nano Lett 2007; 7:2758-63. [PMID: 17655269 DOI: 10.1021/nl071254m] [Citation(s) in RCA: 405] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We have clearly discriminated the single-, bilayer-, and multiple-layer graphene (<10 layers) on Si substrate with a 285 nm SiO2 capping layer by using contrast spectra, which were generated from the reflection light of a white light source. Calculations based on Fresnel's law are in excellent agreement with the experimental results (deviation 2%). The contrast image shows the reliability and efficiency of this new technique. The contrast spectrum is a fast, nondestructive, easy to be carried out, and unambiguous way to identify the numbers of layers of graphene sheet. We provide two easy-to-use methods to determine the number of graphene layers based on contrast spectra: a graphic method and an analytical method. We also show that the refractive index of graphene is different from that of graphite. The results are compared with those obtained using Raman spectroscopy.
Collapse
Affiliation(s)
- Z H Ni
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
| | | | | | | | | | | | | | | |
Collapse
|
21
|
Abstract
Two-dimensional carbon nanowalls (CNWs) were prepared by microwave plasma-enhanced chemical-vapor deposition and scanning electron microscopy was used to observe their morphologies. The Raman observations of different sample orientations and polarizations show that CNWs are well crystallized. Micro-Raman scattering measurements were also carried out with different excitation laser lines (325, 488, 514, 532, and 633 nm). The D band shows a very strong shift of 46.19 cm(-1)eV with excitation laser energy and this has been explained by the double resonance effect. The decreasing intensity ratios IDIG and ID'/IG with increasing laser excitation energy were detected and discussed.
Collapse
Affiliation(s)
- Z H Ni
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
| | | | | | | | | | | |
Collapse
|
22
|
Hou MF, Tsai KB, Fan HM, Wang CY, Lin WC, Liu CS, Lin HJ, Chai CY, Fu OY, Li SS, Chang YY, Huang TJ. Familial breast cancer in southern Taiwan. Kaohsiung J Med Sci 2000; 16:414-21. [PMID: 11221545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
The purpose of this study is to evaluate whether there are pathobiologic differences and differences in overall rates survival between familial and non-familial breast cancer patients in Taiwan. A retrospective study was performed evaluating 76 familial breast cancer patients in 69 families, which included two BRCA1 related cases and six BRCA2 related cases. Patients were compared with 425 non-familial sporadic cases. Familial breast cancer patients had similar ages and stages as non-familial patients (mean, 46.6 years vs 48.9 years, p = 0.306). However, the familial breast cancer patients with BRCA1 and BRCA2 related cases presented at lower stages (p = 0.034) and younger ages than non-familial patients (mean, 45.1 years vs 48.9 years P = 0.042). The occurrence of infiltrating ductal carcinoma and lobular carcinoma in situ was not significantly different in the two groups. Mucinous carcinoma was represented with 6.7% (4/76) and 1.3% (1/76) medullary carcinoma. The overall grade of familial breast cancer, including BRCA1 and BRCA2 related cases in 8 infiltrating ductal carcinoma, was significantly higher than that of controls. The mean follow up was 4.5 years for familial breast cancers. Five- and 10-year overall survival rates were 69% and 61% for those with a family history, compared with 86% and 64% for those in the control group (p = 0.644). There were no statistically significant differences in disease-free survival rates between the two groups at 5 or 10 years (69% vs 78% in 5 years; 48% vs 58% in 10 years) (p = 0.862). Despite the younger ages and earlier stages at presentation in familial breast cancer patients with BRCA1 and BRCA2 related cases, the familial breast cancer patients had higher grade patholobiologic characteristics, but similar prognoses when compared with sporadic breast cancer patients. Owing to the limited number of familial cases in this study, more cases and longer follow up are needed.
Collapse
Affiliation(s)
- M F Hou
- Department of Surgery, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Kaohsiung, Taiwan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Zhang YJ, Fan HM, Huang XM, Zhang JH. Microsurgical recanalization of fallopian tubes after tubosterilization and its related factors. Report of 278 cases. Chin Med J (Engl) 1993; 106:433-6. [PMID: 8222895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Microsurgical tubocanalization was done in 412 patients. 278 women had the operation before the end of December 1987 and were followed up. The overall intrauterine pregnancy rate was 81.3% (92.86% for isthmus-isthmus anastomosis and 87.5% for ampulla-ampulla anastomosis). Two patients had ectopic pregnancy which was followed by term pregnancy subsequently. The factors affecting operative results were analyzed.
Collapse
Affiliation(s)
- Y J Zhang
- Beijing Obstetrics and Gynecology Hospital
| | | | | | | |
Collapse
|
24
|
Gao J, Qiao GM, Wu YM, Wu ME, Zheng SR, Han ZB, Fan HM, Yao GZ, Meng U, Dubois C. Pregnancy interruption with RU 486 in combination with dl-15-methyl-prostaglandin-F2 alpha-methyl ester: the Chinese experience. Contraception 1988; 38:675-83. [PMID: 3219854 DOI: 10.1016/0010-7824(88)90049-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
In a multicenter study taking place in four centers in Beijing (People's Republic of China), pregnancies up to 49 days of amenorrhea (DA) were interrupted with RU 486 (RU 38486, mifepristone, 600 mg orally once), followed 36-60 hours later by administration of dl-15-methyl-PGF 2 alpha-methyl ester (PG05, 1 mg vaginal suppository). One-hundred-and-sixty women were included in the study, three of whom being excluded from efficacy assessment because of non-compliance to the protocol. Complete pregnancy interruption without additional surgical procedure (success) was obtained in 136 women (86.6%, 95% confidence interval: 81.3-91.9%). The success rate was significantly (P = 0.013) higher for pregnancies below (91.3%), than for pregnancies above 42 days of amenorrhea (DA) (76.6%). The time elapsed between RU 486 intake and complete expulsion was 2.8 +/- 1.5 (sd) days (range: 1-12 days). Expulsion took place at the latest 4 days after RU 486 in 125 women (94.7%), and in 107 of these women, it occurred 3.1 +/- 1.7 (sd) hours after PG05 administration. Uterine bleeding occurred in all women after RU 486 intake whatever the outcome of treatment and lasted 11.5 +/- 4.8 (sd) days (range: 3-36 days). It was judged more or much more abundant than usual periods in 6.15% of the women. It led to a slight but significant decrease in hemoglobin as measured eight and 14 days after RU 486 intake. In five women, hemoglobin decreased by 4 g/dl or more, but no patient required a blood transfusion.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- J Gao
- National Institute of Research for Family Planning, Beijing, People's Republic of China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Gao J, Zeng S, Sun BL, Fan HM, Han LH. Menstrual blood loss and hematologic indices in healthy Chinese women. J Reprod Med 1987; 32:822-6. [PMID: 3430490] [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: 01/05/2023]
Abstract
Menstrual blood loss, cyanmethemoglobin and serum ferritin were determined in 421 healthy, noncontracepting Chinese women. The range of menstrual blood loss (MBL) was 4.1-273.6 mL, the mean value was 54.2 mL, and the median was 42.9 mL. The range of hemoglobin was 8.3-16.7 g/dL, and the mean value was 13.2 g/dL. The range of ferritin was 1.2-180.0 ng/mL, the mean value was 22.8 ng/mL, and the geometric mean was 17.1 ng/mL. The upper normal limit of MBL in Chinese women was set at 80 mL.
Collapse
Affiliation(s)
- J Gao
- Department of Clinical Research in Female Fertility Regulation, National Research Institute for Family Planning, Beijing, People's Republic of China
| | | | | | | | | |
Collapse
|
26
|
Gao J, Zeng S, Sun BL, Wu SC, Dong J, Cong J, Zhu XH, Fan HM, Han LH, Xie Z. Menstrual blood loss, haemoglobin and ferritin concentration of Beijing women wearing steel ring, VCu 200, and TCu 220c IUDs. Contraception 1986; 34:559-71. [PMID: 3829674 DOI: 10.1016/s0010-7824(86)80012-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Menstrual blood loss (MBL), serum ferritin and whole blood cyanmethemoglobin were measured at pre- and 1, 3, 6, 12, 18 and 24th postinsertion cycles in 60 women wearing the Steel Ring, the Copper V (VCu 200) or the Copper T (TCu 220c). The MBL, incidence of menorrhagia and iron deficiency anemia were lower among users of the Steel Ring than among users of the Copper V and T. Anemia occurred later and the duration of menstruation was shorter with the Steel Ring than with the Copper T. There were no statistically significant differences between the Copper V and T.
Collapse
|
27
|
Gao J, Shen H, Zheng S, Fan HM, Wu MH, Han LH, Yao GZ. A randomized comparative clinical evaluation of the Steel Ring, the VCu200 and the TCu220c IUDs. Contraception 1986; 33:443-54. [PMID: 3530634 DOI: 10.1016/s0010-7824(86)80003-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A randomized comparative clinical study of the Steel Ring, VCu200 and TCu220c IUDs was carried out in Beijing. Six-hundred subjects were recruited and each group of 200 was inserted with one of the three devices. The TCu220c and the VCu200 had statistically significantly lower pregnancy and expulsion rates at one and two years of use than the Steel Ring. However, the Steel Ring consistently had the lowest rate of removal for pain and/or bleeding. At two years, the early differences of use-related discontinuation and continuation between the higher rates of the Steel Ring and the lower rates of the VCu200 and TCu220c were significantly reduced. There were no statistically significant differences of net event rates between VCu200 and TCu220c.
Collapse
|
28
|
Gao J, Zeng S, Ma LY, Fan HM, Hu XL, Han LH. Effect of intrauterine devices on menstrual blood loss. Acta Acad Med Wuhan 1984; 4:140-4. [PMID: 6483311 DOI: 10.1007/bf02856866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
29
|
Fan HM, Huang XM, Wu MH. [Clinical comparison of four types of IUDs made in China]. Shengzhi Yu Biyun 1983; 3:12-7. [PMID: 12267394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
Abstract
In order to compare the clinical efficacy of 4 types China made IUDs, this paper reported the study of a total of 1227 cases who, from January 1973 to June 1975, had used 1 of the 4 types of IUDs -- the stainless steel ring, metallic plastic mixed ring, metallic and silastic copper-shaped devices. The study was not a random allocation but was done, 1 type by 1, during the period. Life table method and logrank test were used to calculate and analyze the different events among these 4 types. 1147 cases were followed up for more than 5 years. The 5-year followup rate was 93.48%. Patients using these 4 types were comparable among themselves since the distribution of their age, gravida, para, and time of insertion were the same or quite similar. Study results were as follows: the cumulative pregnancy rates of the 2 copper V-shaped IUDs were significantly lower than that of the steel and mixed ring (p0.01); the cumulative expulsion rate of the steel ring was comparatively high, but there was no statistical difference compared with the others; bleeding was the main cause of medical removals; there was a higher cumulative medical removal rate of the V-shaped than that of the ring-shaped and also a significant difference between them (p0.01). However, at every year, the year-cumulative continuation rates were similar despite the difference of the events of discontinuation rates. The fact that 51.72-62.29% of the subjects continued to wear these IUDs indicated that the efficacy of the 4 types of IUDs was satisfactory even after a 5-year course.
Collapse
|
30
|
Gao J, Ma LY, Zeng S, Fan HM, Han LH. [Menstrual blood loss in healthy Chinese women]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1982; 4:192-4. [PMID: 6215149] [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: 01/19/2023]
|
31
|
|
32
|
Britt BA, Endrenyi L, Cadman DL, Fan HM, Fung HY. Porcine malignant hyperthermia: effects of halothane on mitochondrial respiration and calcium accumulation. Anesthesiology 1975; 42:292-300. [PMID: 163600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Vastus lateralis muscle was excised from normal pigs and from pigs susceptible to malignant hyperthermia. Anesthesia consisted of diazepam, N2O:O2, and a lidocaine field block. In the susceptible (MHS) pigs, respiratory control in mitochondria of excised muscle was normal, while electron transport was accelerated. Glutamate log Q3's and log Q4's were in inverse linear relationship to porcine weights. In the presence of glutamate, state 3 respiration was 3.5 times, and state 4 respiration 3.2 times, higher in MHS than in normal mitochondria (independent of weight or halothane dose). Thus, the MHS mitochondria were able to produce ATP more efficiently than normal mitochondria. In vitro, halothane inhibited glutamate Q3's and R.C.I.'s, slightly increased succinate Q3's and R.C.I.'s, had no significant effect on glutamate or succinate Q4's, and, moderately lowered glutamate and succinate P/O ratios. These changes were similar to those observed in normal pigs. Calcium uptake into MHS mitochondria was markedly less than normal but was not significantly altered by in-vitro halothane. These results suggest a mitochondrial membrane component for the defect of procine malignant hyperthermia since calcium is normally associated with the formation of the phospholipid lattice of this membrane. (Key words: Hyperthermia, malignant; Metabolism, mitochondrial; Muscle, skeletal, mitochondria; Anesthetics, volatile, halotbane; Ions, calcium.)
Collapse
|