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Jin X, Yang H, Ma W, Yuan Y, Li T. Elevated High Sensitivity Cardiac Troponin T is Nonlinearly Associated with Poor Prognosis in Aging COVID-19 Patients: A Retrospective Study. Infect Drug Resist 2023; 16:5155-5163. [PMID: 37581166 PMCID: PMC10423578 DOI: 10.2147/idr.s422492] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 08/03/2023] [Indexed: 08/16/2023] Open
Abstract
Objective To evaluate the relationship between high-sensitivity cardiac troponin T (hs-cTnT) and prognosis in elderly patients with coronavirus disease 2019 (COVID-19). Methods This study recruited 1399 COVID-19 patients aged 65 years or older admitted to Taizhou Hospital or Enze Hospital in Zhejiang Province from December 15, 2022, to January 4, 2023. The Cox regression model was used to evaluate the relationship between hs-cTnT level and in-hospital death. The logistic regression model was used to evaluate the relationship between hs-cTnT level and major adverse events. The restricted cubic spline (RCS) model is used for nonlinear analysis. Results The increase of peak hs-cTnT was associated with the increased risk of death (HR 9.49; 95% CI 1.19-75.48; trend p = 0.012) and major adverse events (OR 20.59; 95% CI 10.41-40.71; trend p < 0.001). RCS model showed the association between peak hs-cTnT and death and major adverse events were nonlinear (P for non-line < 0.001). Starting from the limit of quantification of hs-cTnT (3ng/L), the risk of death and major adverse events had a steep S-shaped increase until hs-cTnT reached the 90th percentile point (hs-cTnT = 131 ng/L), followed by a plateau period. Peak hs-cTnT has good predictive value for death and major adverse events, with AUC of 0.834 and 0.804, respectively. Conclusion Peak hs-cTnT has high predictive value for the risk of in-hospital death and major adverse events in elderly patients with COVID-19. The association between peak hs-cTnT and death and major adverse events were nonlinear.
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Affiliation(s)
- Xiaxia Jin
- Department of Clinical Laboratory, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, People’s Republic of China
| | - Haideng Yang
- Department of Gastroenterology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, People’s Republic of China
| | - Weiwei Ma
- Department of Clinical Laboratory, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, People’s Republic of China
| | - Yuan Yuan
- Department of Clinical Laboratory, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, People’s Republic of China
| | - Tao Li
- Department of Cardiovascular Medicine, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, People’s Republic of China
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Yang HD, Jin XX, Gu BB, Yu-Zhang, Li D, Yan LL. ARL9 is upregulated and serves as a biomarker for a poor prognosis in colon adenocarcinoma. BMC Gastroenterol 2023; 23:48. [PMID: 36823542 PMCID: PMC9951453 DOI: 10.1186/s12876-023-02677-8] [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] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 02/13/2023] [Indexed: 02/25/2023] Open
Abstract
BACKGROUND ARL9 is a newly identified member of the ARF family, and the clinical significance of ARL9 in colon adenocarcinoma is unknown. In this study, we aimed to explore the expression of ARL9 mRNA in colon adenocarcinoma, and its effect on the prognosis of patients with colon adenocarcinoma. METHODS We investigated the differential expression of ARL9 between colon adenocarcinoma tissue and adjacent tissues through a bioinformatics analysis using The Cancer Genome Atlas (TCGA) database. The correlation between clinical characteristics and the mRNA expression level of ARL9 were analyzed. A survival analysis and a Cox regression analysis were used to determine the prognostic significance of ARL9. Finally, we conducted a gene set enrichment analysis (GSEA) to explore the ARL9 signaling pathways involved in the development of colon adenocarcinoma. The effect of the expression of ARL9 on the proliferation and migration of colon adenocarcinoma was analyzed by the CCK8 method and a cell scratch test, respectively. RESULTS The mRNA expression of ARL9 in colon adenocarcinoma tissues was higher in comparison to the level in normal adjacent tissues (P < 0.05). The mRNA expression of ARL9 was not related to sex, tumor stage, T stage, N stage, M stage, but to age. The 5-year survival rate of colon adenocarcinoma patients with high ARL9 mRNA expression levels was significantly lower than that of patients with low ARL9 mRNA expression levels (P < 0.05). Age and the high mRNA expression of ARL9 were independent risk factors for a poor prognosis in patients with colon adenocarcinoma. The GSEA suggested that ARL9 may be able to upregulate cell adhesion, extracellular matrix receptor interactions, tumor-associated pathways, and downregulate the citrate cycle and tricarboxylic acid cycle pathway, which are involved in the development of colon adenocarcinoma. After knocking down ARL9, the proliferation and migration abilities of colon adenocarcinoma cells were decreased (P < 0.01). CONCLUSION The mRNA expression of ARL9 is upregulated in colon adenocarcinoma, and higher mRNA expression levels are associated with a poor prognosis. Knocking down ARL9 can reduce the proliferation and migration of colon adenocarcinoma cells. ARL9 mRNA can be used as a prognostic biomarker in patients with colon adenocarcinoma.
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Affiliation(s)
- Hai-deng Yang
- Key Laboratory of Minimally Invasive Techniques and Rapid Rehabilitation of Digestive System Tumor of Zhejiang Province, Linhai, China ,grid.469636.8Department of Gastroenterology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, China
| | - Xiu-xiu Jin
- Key Laboratory of Minimally Invasive Techniques and Rapid Rehabilitation of Digestive System Tumor of Zhejiang Province, Linhai, China ,grid.469636.8Department of Gastroenterology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, China
| | - Bin-bin Gu
- Key Laboratory of Minimally Invasive Techniques and Rapid Rehabilitation of Digestive System Tumor of Zhejiang Province, Linhai, China ,grid.469636.8Department of Gastroenterology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, China
| | - Yu-Zhang
- Key Laboratory of Minimally Invasive Techniques and Rapid Rehabilitation of Digestive System Tumor of Zhejiang Province, Linhai, China ,grid.469636.8Department of Gastroenterology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, China
| | - Dan Li
- grid.469636.8Endoscopy Center, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, China
| | - Ling-ling Yan
- Key Laboratory of Minimally Invasive Techniques and Rapid Rehabilitation of Digestive System Tumor of Zhejiang Province, Linhai, China ,grid.469636.8Department of Gastroenterology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, China
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Dwivedi GD, Kumawat SM, Yen TW, Wang CW, Chandrasekhar Kakarla D, Joshi AG, Yang HD, Huang SM, Chou H. Understanding the correlation between orbital degree of freedom, lattice-striction and magneto-dielectric coupling in ferrimagnetic Mn 1.5Cr 1.5O 4. J Phys Condens Matter 2021; 33:505802. [PMID: 34547729 DOI: 10.1088/1361-648x/ac28c3] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 09/21/2021] [Indexed: 06/13/2023]
Abstract
Dielectric anomaly observed in cubic Mn1.5Cr1.5O4around ferrimagnetic ordering temperature (TN) suggests a possible magneto-dielectric coupling in the system. This report confirms the presence of a weak but significant magneto-dielectric coupling in the system. Theab initiocalculations show a band gap of around 1.2 eV, with Fermi-level closer to the conduction band. The major features of conduction band nearest to the Fermi-level correspond todxzandd3z2-r2orbitals of Mn3+ion. Temperature-dependent neutron diffraction results show a rapid decay in structural parameters (lattice-striction and transition metal-oxygen bond length) aroundTN.We confirmed that these changes in structural parameters atTNare not related to structural transition but the consequences of orbital-ordering of Mn3+. The rapid decay in transition metal-oxygen bond length under internal magnetism of the system shows that magnetism could certainly manipulate the electric dipole moment and hence the dielectric constant of the system. Magneto-striction acts as a link between magnetic and dielectric properties.
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Affiliation(s)
- G D Dwivedi
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - S M Kumawat
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Tsung-Wen Yen
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - C W Wang
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, Republic of China
| | - D Chandrasekhar Kakarla
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Amish G Joshi
- CSIR-Central Glass & Ceramic Research Institute, Naroda Centre, 168-169 Naroda Industrial Estate, Ahmedabad-382 330, India
- CSIR-National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi 110012, India
| | - H D Yang
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Shin-Ming Huang
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - H Chou
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
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Yu Z, Mao X, Tang M, Chen Y, Wu M, Jin M, Wang J, Xu L, Ye G, Ding J, Ye B, Chen D, Chen Y, Chen X, Sheng X, Li H, Chen Q, Teng X, Ding Q, Yang H, Shen Z, Chen K, Yu C. Association between past exposure to fine particulate matter (PM 2.5) and peptic ulcer: A cross-sectional study in eastern China. Chemosphere 2021; 265:128706. [PMID: 33139052 DOI: 10.1016/j.chemosphere.2020.128706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 10/18/2020] [Accepted: 10/19/2020] [Indexed: 06/11/2023]
Abstract
Ambient fine particulate matter (particle diameter < 2.5 μm, or PM2.5) is a major public health concern in China. Exposure to PM2.5 has been associated with a wide range of adverse health outcomes. The current study aimed to estimate the association between exposure to PM2.5 and the risk of peptic ulcer diseases (PUDs). We conducted a hospital-based cross-sectional study of seven major cities in Zhejiang Province, China (combined population > 57 million people), which included a total of 647,092 subjects who underwent gastroscopy examination (86,852 subjects were diagnosed with PUDs) recorded in 13 large hospitals from 2014 to 2018. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated to evaluate the relationship between PM2.5 and PUDs, including duodenal ulcers (DUs) and gastric ulcers (GUs). The overall estimated OR (95% CI) associated with every 10-μg/m3 increase in the 1-month average PM2.5 before the detection of PUDs was 1.050 (95% CI: 1.038, 1.063). The association between PM2.5 concentration and the prevalence of PUDs tended to be attenuated but remained significant when considering different exposure periods (OR = 1.030, 95% CI = 1.018-1.043 for the 3-month moving average; OR = 1.020, 95% CI = 1.005-1.037 for the 6-month moving average). Stronger associations were observed for DUs than GUs. The observed positive association of PM2.5 exposure with PUDs remained significant in the two-pollutant models after adjusting for other air pollutants. Our findings could provide scientific evidence for a more general adverse role of air pollution on PUDs.
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Affiliation(s)
- Zhebin Yu
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, China; Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou, Zhejiang, China
| | - Xinli Mao
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, China
| | - Mengling Tang
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, China; Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou, Zhejiang, China
| | - Yi Chen
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, China
| | - Mengyin Wu
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou, Zhejiang, China
| | - Mingjuan Jin
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou, Zhejiang, China
| | - Jianbing Wang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou, Zhejiang, China
| | - Lei Xu
- Department of Gastroenterology, Ningbo First Hospital, Zhejiang, China
| | - Guoliang Ye
- Department of Gastroenterology, The Affiliated Hospital of Ningbo University School of Medicine, Zhejiang, China
| | - Jin Ding
- Department of Gastroenterology, Jinhua Municipal Central Hospital, Zhejiang, China
| | - Bin Ye
- Department of Gastroenterology, The First Affiliated Hospital of Wenzhou Medical University, Zhejiang, China
| | - Dongya Chen
- Department of Gastroenterology, Zhejiang Integrated Traditional Chinese and Western Medicine Hospital, Zhejiang, China
| | - Yu Chen
- Department of Gastroenterology, The First Hospital of Jiaxing, Zhejiang, China
| | - Xia Chen
- Department of Gastroenterology, Wenling First People's Hospital, Zhejiang, China
| | - Xiancang Sheng
- Department of Gastroenterology, Taizhou First People's Hospital, Zhejiang, China
| | - Hongzhang Li
- Department of Gastroenterology, Sanmen People's Hospital, Zhejiang, China
| | - Qiang Chen
- Department of Gastroenterology, Sanmen People's Hospital, Zhejiang, China
| | - Xiaosheng Teng
- Department of Gastroenterology, Taizhou Central Hospital, Zhejiang, China
| | - Qiulong Ding
- Department of Gastroenterology, People's Hospital of Tiantai County, Zhejiang, China
| | - Haideng Yang
- Department of Gastroenterology, Taizhou Enze Hospital, Zhejiang, China
| | - Zhe Shen
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, China.
| | - Kun Chen
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou, Zhejiang, China.
| | - Chaohui Yu
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, China.
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Kumari A, Dhanasekhar C, Chaddah P, Kakarla DC, Yang HD, Yang ZH, Chen BH, Chung YC, Das AK. Magnetic glassy state at low spin state of Co 3+ in EuBaCo 2O 5+δ (δ = 0.47) cobaltite. J Phys Condens Matter 2020; 32:155803. [PMID: 31851963 DOI: 10.1088/1361-648x/ab634a] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The magnetic glassy state is a fascinating phenomenon, which results from the kinetic arrest of the first order magnetic phase transition. Interesting properties, such as metastable magnetization and nonequilibrium magnetic phases, are naturally developed in the magnetic glassy state. Here, we report magnetic glass property in the low spin state of Co3+ in EuBaCo2O5+δ (δ = 0.47) cobaltite at low temperature (T < 60 K). The measurements of magnetization under the cooling and heating in unequal fields, magnetization relaxation and thermal cycling of magnetization show the kinetic arrest of low magnetization state below 60 K. The kinetically arrested low temperature magnetic phase is further supported through the study of isothermal magnetic entropy, which shows the significant entropy change. The present results will open a new window to search the microscopic relation between the spin state transitions and the kinetic arrest induced magnetic glassy phenomena in complex materials.
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Affiliation(s)
- Archana Kumari
- Department of Physics, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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Yang J, Wang F, Han X, Yuan J, Yao P, Liang Y, Wei S, Zhang XM, Guo H, Yang HD, He MA. [Different anthropometric indices and incident risk of hypertension in elderly population: a prospective cohort study]. Zhonghua Yu Fang Yi Xue Za Zhi 2019; 53:272-278. [PMID: 30841666 DOI: 10.3760/cma.j.issn.0253-9624.2019.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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 explore the relationship between anthropometric indices and the incident risk of hypertension, compare novel anthropometric indices with traditional indices in hypertension prediction and establish hypertension prediction models among elderly Chinese. Methods: A total of 27 009 retirees from the Dongfeng Motor Corporation were recruited at baseline in 2008 and the first follow-up was conducted in 2013. After the exclusion of participants less than 60 years old, participants with hypertension, coronary heart disease, stroke, cancer, and those with missing data, a total of 6 784 elderly participants were enrolled in this study. A multivariate logistic regression model was used to analyze the relationship between traditional anthropometric indices, body mass index (BMI), waist circumference (WC), waist-to-height ratio (WHtR), novel anthropometric indices, visceral adiposity index (VAI), body shape index (ABSI), body roundness index (BRI), and the incident risk of hypertension. Meanwhile, a multivariate logistic regression model was used to establish hypertension prediction models. Receiver operating characteristic (ROC) curve was applied to compare the prediction ability of different models. Results: A total of 1 787 incident cases of hypertension were identified, with the incidence of hypertension about 27.59%. Significant positive associations were detected between BMI, WC, WHtR, VAI, BRI and the incident risk of hypertension after adjusting for potential confounders (all P values<0.05). In men, the OR (95%CI) (upper tertile vs lower tertile) was 1.45 (1.22-1.73) for VAI, and 1.86 (1.55-2.23) for BRI. In women, the OR (95% CI) (upper tertile vs lower tertile) was 1.55 (1.22-1.96) for VAI, and 1.60 (1.27-2.01) for BRI. For ABSI, no significant association was observed in either men (OR (95%CI): 1.07 (0.90-1.28)) or women (OR (95%CI): 1.03 (0.82-1.29), both P values >0.05). The basic hypertension prediction model included age, drinking (only in men), education status (only in men), systolic blood pressure (SBP), diastolic blood pressure (DBP), and fasting blood glucose levels. Based on the basic prediction model, BMI (in men: AUC=0.697) and BRI (only in men: AUC=0.696) improved area under ROC curve (AUC) significantly (P<0.05). BMI was the strongest predictor in both men (AUC=0.697) and women (AUC=0.685) in the extended model. Conclusion: Significant positive associations were detected between BMI, WC, WHtR, VAI, BRI and the incident risk of hypertension among elderly Chinese. BMI was the strongest predictor in hypertension prediction model compared with other anthropometric indices.
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Affiliation(s)
- J Yang
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - F Wang
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - X Han
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - J Yuan
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - P Yao
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Y Liang
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - S Wei
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - X M Zhang
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - H Guo
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - H D Yang
- Department of Cardiovascular Medicine, Dongfeng General Hospital, Shiyan 442000, China
| | - M A He
- Department of Occupational and Environmental Health/State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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Zhang J, Wang ZY, Yang Q, Yang HD, Zhao Y, Yu YJ, Chen Y, Wang W, Zhang W. [A multi-center clinical retrospective study on the therapeutic effect of endoscopic myringoplasty]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2019; 54:245-250. [PMID: 30991772 DOI: 10.3760/cma.j.issn.1673-0860.2019.04.002] [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: 02/05/2023]
Abstract
Objective: To analyze the therapeutic effect of endoscopic myringoplasty. Methods: A retrospective analysis of 523 patients with chronic otitis media who underwent endoscopic myringoplasty between June 2016 and June 2017 in eight tertiary hospitals in China. Among all the patients, 256 were male and 267 were female, aged from 18 to 68 years old. The grafts used to repair the tympanic membrane were all tragus cartilage-perichondrium complex. All patients were followed up at 1 month, 3 months, 6 months, 9 months, and 12 months after surgery, at least 3 months. The closure rate of tympanic membrane perforation by different factors, the hearing results, and the incidence of postoperative complications were analyzed. SPSS 21.0 software was used to analyze the data. Results: Three months after operation, the closure rates of anterior, inferior, posterior and subtotal perforation were 92.4% (109/118), 94.9% (93/98), 95.6% (129/135), and 89.0% (153/172) respectively, the difference was not statistically significant (χ(2)=5.779, P=0.123). The closure rates of small, medium and large perforations were 100.0% (82/82), 93.7% (178/190) and 89.2% (224/251) respectively. The difference was statistically significant (χ(2)=10.927, P=0.004). The closure rates of dry ear and wet ear tympanic membrane perforation were 93.1% (392/421), 90.2% (92/102), the difference was not statistically significant (χ(2)=1.011, P=0.915). The preoperative pure tone audiometry(PTA) was (38.4±5.3) dBHL, while, the 3-month postoperative PTA was (25.1±5.7) dBHL. The difference was statistically significant (t=39.079, P<0.001). The preoperative air bone gap (ABG) was (22.4±4.3) dB, while 3 months postoperative ABG was (9.1±3.8) dB. The difference was statistically significant (t=53.004, P<0.001). Of all 523 patients, 14 (2.7%) had middle ear infection, 8 (1.5%) had dislocated tympanic membrane, 12 (2.3%) had parageusia, 35 (6.7%) had tinnitus, 28 (5.4%) had hearing loss, 26 (5.0%) had vertigo,33 (6.3%) had reperforation, 2 (0.4%) had secondary cholesteatoma, and none had facioplegia. Conclusions: Endoscopic myringoplasty is a safe and effective surgical method with good postoperative outcome.
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Affiliation(s)
- J Zhang
- Department of Otorhinolaryngology Head and Neck Surgery, Shaanxi Provincial People's Hospital, Xi'an 710068, China
| | - Z Y Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Nineth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200011, China
| | - Q Yang
- Department of Otorhinolaryngology Head and Neck Surgery, Shenzhen Sixth People's Hospital(Nanshan Hospital), Shenzhen 518052, China
| | - H D Yang
- Department of Otorhinolaryngology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China
| | - Y Zhao
- Department of Otorhinolaryngology Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Y J Yu
- Department of Otorhinolaryngology Head and Neck Surgery, the First People's Hospital of Foshan, Foshan 528000, China
| | - Y Chen
- Department of Otorhinolaryngology Head and Neck Surgery, Xijing Hospital, Airforce Military Medical University, Xi'an 710032, China
| | - W Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Central Hospital, Tianjin 300192, China
| | - W Zhang
- Department of Otorhinolaryngology Head and Neck Surgery, Shaanxi Provincial People's Hospital, Xi'an 710068, China
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Kong WJ, Ding XY, Wang YF, Wang WQ, Wang X, Wang W, Sun Y, Tang WL, Li XP, Zhang W, Chen Y, Wang ZY, Yang HD, Yang Q, Zhao Y, Hou ZH, Cui Y, Yu YJ. [Endoscopic ear surgery: flash in the pan or transformative innovation? (Ⅱ)]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 32:1531-1541. [PMID: 30400702 DOI: 10.13201/j.issn.1001-1781.2018.20.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Indexed: 11/12/2022]
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9
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Dai YR, Yang HD, Zheng YQ. [Outcomes of same-day bilateral endoscopic tympanoplasty]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 32:1271-1274. [PMID: 30282174 DOI: 10.13201/j.issn.1001-1781.2018.16.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Indexed: 11/12/2022]
Abstract
Objective:To investigate the feasibility of simultaneous bilateral endoscopic for tympanoplasty in patients with bilateral chronic suppurative otitis media. Method:Fifteen patients (30 ears) with bilateral chronic suppurative otitis media who underwent bilateral endoscopic transcanal tympanoplasty on the same day were enrolled in this study. The ear with worse-hearing was selected as the first operation side, the contralateral ear as the second one. The operation group consisted of 22 ears of Type 1 tympanoplasty, 5 ears of Type 2 tympanoplasty and 3 ears of Type 3 tympanoplasty. All second sides(15 ears) underwent Type 1 tympanoplasty. The cartilage-perichondrium graft was harvested from the tragal of the first side and was cut in two halves which could be used for the both sides. The graft success and hearing improvement were evaluated at the postoperative 6th month according to the follow up results of the endoscopic image and the pure-tone audiometry. Result:The graft take rate was 96.7%(27/30) without any retraction pockets or displaced grafts. The graft take rate of the first side was 93.3%(14/15), and the one of the second side was 100.0%(15/15). The average air conduction thresholds were (50.9±9.1) dB HL preoperatively and (32.0±6.0) dB HL postoperatively(P<0.01). The average air-bone gap overall improved from (30.2±7.9) dB HL preoperatively to (13.7±6.0) dB HL postoperatively(P<0.01). Conclusion:Bilateral same-day endoscopic tympanoplasty are safe and cost effective in appropriately selected patients. It can offer favorable out-comes in selected patients with chronic suppurative otitis media.
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Affiliation(s)
- Y R Dai
- Department of Otolaryngology Head and Neck Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510120, China
| | - H D Yang
- Department of Otolaryngology Head and Neck Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510120, China
| | - Y Q Zheng
- Department of Otolaryngology Head and Neck Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510120, China
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Zhang XY, Ou YK, Lin YL, Xu YD, Huang QH, Cai YX, Xiong H, Liang MJ, Yang HD, Zhong JW, Zheng YQ. [A clinical analysis for sudden sensorineural hearing loss withcontralateral sensorineural hearing loss]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 30:1104-1109. [PMID: 29798431 DOI: 10.13201/j.issn.1001-1781.2016.14.003] [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] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Indexed: 06/08/2023]
Abstract
Objective:To analyze the clinical characteristics and prognosis,and to learn the impact factors of patients with sudden sensorineural hearing loss with contralateral sensorineural hearing loss(SSHLwCSHL).Method:Clinical data of 63 cases of patients with SSHLwCSHL were analyzed systematically,including all the clinical manifestations,audiologic characteristics and the effect assessment,and compared with that of unilateral sudden sensorineural hearing loss(USSHL) and bilateral sudden sensorineural hearing loss(BSSHL).Base on those,we summarized comprehensively the development and prognosis characteristics of the disease.Result:The incidence of SSHLwCSHL was 8.3 percent of overall patients with SSNHL.SSHLwCSHL occurs more commonly in male patients,with more vertigo,diabetes mellitus,and lipid panel abnormalities compared with other groups.Hearing curve and the degree of hearing loss of the prevalence ear of SSHLwCSHL was statistically significant difference with USSHL(P<0.05).Most common reason of the contralateral hearing loss was sudden sensorineural hearing loss(49%),and 59% patients of SSHLwCSHL suffered hearing loss of other ear after 2-10 years after contralateral hearing loss.The total effective rate was 14.3%,1 in 63 patients cured,1 excellence and 6 effective.The total effective rate was 9.5% in patients with severe or profound sensorineural hearing loss in the contralateral ear,which was lower than that of patients with moderate and moderately severe sensorineural hearing loss in the contralateral-ear(P=0.021).Conclusion:SSHLwCSHL has complex condition.The prognosis for improvement is poor.Recognition of similarities and differences between bilateral and unilateral SSNHL can help in counseling and managing the patients.
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Affiliation(s)
- X Y Zhang
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - Y K Ou
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - Y L Lin
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - Y D Xu
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - Q H Huang
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - Y X Cai
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - H Xiong
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - M J Liang
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - H D Yang
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - J W Zhong
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
| | - Y Q Zheng
- Department of Otolaryngology,Sun Yat-Sen Memorial Hospital,Sun Yat-Sen University,Guangzhou,510120,China
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Krishna Murthy J, Chandrasekhar KD, Wu HC, Yang HD, Lin JY, Venimadhav A. Antisite disorder driven spontaneous exchange bias effect in La(2-x)Sr(x) CoMnO₆ (0 ⩽ x ⩽ 1). J Phys Condens Matter 2016; 28:086003. [PMID: 26823459 DOI: 10.1088/0953-8984/28/8/086003] [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: 06/05/2023]
Abstract
Doping at the rare-earth site by divalent alkaline-earth ions in perovskite lattice has witnessed a variety of magnetic and electronic orders with spatially correlated charge, spin and orbital degrees of freedom. Here, we report an antisite disorder driven spontaneous exchange bias effect as a result of hole carrier (Sr(2+)) doping in La(2-x)Sr(x)CoMnO6 (0 < x < 1) double perovskites. X-ray diffraction and Raman spectroscopy have evidenced an increase in disorder with the increase of Sr content up to x = 0.5 and thereby a decrease from x = 0.5 to 1. X-ray absorption spectroscopy has revealed that only Co is present in the mixed valence of Co(2+) and Co(3+) states with Sr doping to compensate the charge neutrality. Magnetotransport is strongly correlated with the increase of antisite disorder. The antisite disorder at the B-site interrupts the long-range ferromagnetic order by introducing various magnetic interactions and instigates reentrant glassy dynamics, phase separation and canted type antiferromagnetic behavior with the decrease of temperature. This leads to a novel magnetic microstructure with unidirectional anisotropy that causes a spontaneous exchange bias effect that can be tuned with the amount of antisite disorder.
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Affiliation(s)
- J Krishna Murthy
- Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur-721302, India
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12
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Kumar S, Dwivedi GD, Kumar S, Mathur RB, Saxena U, Ghosh AK, Joshi AG, Yang HD, Chatterjee S. Structural, transport and optical properties of (La0.6Pr0.4)0.65Ca0.35MnO3 nanocrystals: a wide band-gap magnetic semiconductor. Dalton Trans 2015; 44:3109-17. [PMID: 25567084 DOI: 10.1039/c4dt03452j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
(La0.6Pr0.4)0.65Ca0.35MnO3 system has been synthesized via a sol-gel route at different sintering temperatures. Structural, transport and optical measurements have been carried out to investigate (La0.6Pr0.4)0.65Ca0.35MnO3 nanoparticles. Raman spectra show that Jahn-Teller distortion has been decreased due to the presence of Ca and Pr in A-site. Magnetic measurements provide a Curie temperature around 200 K and saturation magnetization (MS) of about 3.43μB/Mn at 5 K. X-ray photoemission spectroscopy study suggests that Mn exists in a dual oxidation state (Mn(3+) and Mn(4+)). Resistivity measurements suggest that charge-ordered states of Mn(3+) and Mn(4+), which might be influenced by the presence of Pr, have enhanced insulating behavior in (La0.6Pr0.4)0.65Ca0.35MnO3. Band gap estimated from UV-Vis spectroscopy measurements comes in the range of wide band gap semiconductors (∼3.5 eV); this makes (La0.6Pr0.4)0.65Ca0.35MnO3 a potential candidate for device application.
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Affiliation(s)
- Satyam Kumar
- Department of Physics, Banaras Hindu University, Varanasi-221005, India
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13
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Kuo HT, Liu RS, Filipek SM, Wierzbicki R, Sato R, Chan CL, Yang HD, Lee JF. Formation of hydrides in (Ti(1-x)Zr(x))Co(2.00) (0 < x < 1) pseudobinary alloys. Inorg Chem 2009; 48:11655-9. [PMID: 19919020 DOI: 10.1021/ic901760j] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The exposure of (Ti(1-x)Zr(x))Co(2.00) intermetallic alloys to hydrogen at high pressure caused (Ti(1-x)Zr(x))Co(2.00) (x = 0.50-0.90) hydrides in the alloy. The crystalline structural, electronic, and magnetic properties of parent alloys and of their hydrides were determined by using XRD (X-ray powder diffraction) and XAS (X-ray absorption spectrometry) and by the use of SQUID (a superconducting quantum interference device). Hydrogenation did not alter the crystal structure of the parent alloy, but it did increase the volume of the unit cell. An in situ Co K-edge XAS study of the hydride revealed that the valence state of Co increased during discharge (which is the release of hydrogen from the hydride). Hydrogenation of the parent alloy also reduced the magnetic moment. A possible mechanism of discharge for the hydride is also proposed.
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Affiliation(s)
- H T Kuo
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan
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Her JL, Matsuda YH, Suga K, Kindo K, Takeyama S, Berger H, Yang HD. High-field magnetization of a two-dimensional spin frustration system, Ni(5)(TeO(3))(4)X(2) (X = Br, Cl). J Phys Condens Matter 2009; 21:436005. [PMID: 21832451 DOI: 10.1088/0953-8984/21/43/436005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The high-field magnetization, M(H), of Ni(5)(TeO(3))(4)X(2) (X = Br, Cl) was measured by using a pulse magnet. These compounds have a two-dimensional crystal structure and a distorted Kagome spin frustrated system which is built from the Ni(2+) ions (S = 1). The Néel transition temperatures are T(N)∼28 and 23 K for X = Br and Cl, respectively. When T<T(N), we observe step-like transitions, at H(c)∼11 and 10 T for X = Br and Cl, respectively. On the other hand, for T>T(N), the field-dependent magnetization curves behave like a monotonically increasing straight line up to 55 T. The H(c) value is close to those obtained in previous spin resonance studies in which a model of a spin-flop scenario was proposed to explain the field-dependent resonance spectra. With the earlier model a further transition at around 23 T was predicted; however, our observations did not show any plateau behaviors, saturation or other anomalies up to 55 T, suggesting that the further transition possibly exists in a much higher field region.
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Affiliation(s)
- J L Her
- Institute for Solid State Physics, University of Tokyo, Japan
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Huang SW, Jeng HT, Lin JY, Chang WJ, Chen JM, Lee GH, Berger H, Yang HD, Liang KS. Electronic structure of pyrochlore Cd(2)Re(2)O(7). J Phys Condens Matter 2009; 21:195602. [PMID: 21825493 DOI: 10.1088/0953-8984/21/19/195602] [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: 05/31/2023]
Abstract
Detailed band structure calculations have been performed for Cd(2)Re(2)O(7) in high-, middle- and low-temperature (T) phases. The calculations are based on the observed lattice structures from x-ray diffraction measurements. The spin-orbit interaction is incorporated self-consistently in both the generalized gradient approximation (GGA) and the GGA plus Hubbard U (GGA+U) approaches. It is found that the on-site U has negligible effects on the Re 5d band structures; therefore both the GGA and GGA+U Re 5d band energies agree well with the observed O K-edge x-ray absorption spectroscopy (XAS) spectrum, whereas the Cd 4d band energy observed from photoemission spectroscopy can only be correctly reproduced by GGA+U calculations, indicating the relatively itinerant Re 5d and localized Cd 4d electrons. On the other hand, the spin-orbit coupling gives rise to nontrivial spin and orbital magnetic moments for the middle- T phase. Most unexpectedly, we found that the low- T phase exhibits quasi-two-dimensional Fermi surfaces. The calculated carrier numbers for the three phases are, at least qualitatively, consistent with the measured Hall coefficient.
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Affiliation(s)
- Shih-Wen Huang
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan. Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan
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16
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Lin TH, Shih HC, Hsieh CC, Luo CW, Lin JY, Her JL, Yang HD, Hsu CH, Wu KH, Uen TM, Juang JY. Strain-induced effects on antiferromagnetic ordering and magnetocapacitance in orthorhombic HoMnO(3) thin films. J Phys Condens Matter 2009; 21:026013. [PMID: 21814006 DOI: 10.1088/0953-8984/21/2/026013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigated the magnetic and ferroelectric properties of c-axis oriented orthorhombic phase HoMnO(3) (o-HMO in Pbnm symmetry setting) thin films grown on Nb-doped SrTiO(3)(001) substrates. The o-HMO films exhibit an antiferromagnetic ordering near 42 K, irrespective of the orientation of the applied field. However, an additional magnetic ordering occurring around 35 K was observed when the field was applied along the c-axis of o-HMO, which was absent when the field was applied in the ab-plane. The magnetocapacitance measured along the c-axis showed that although there is evidence of dielectric constant enhancement when the temperature is below 35 K the expected abrupt change in dielectric constant appears at a much lower temperature and reaches maximum around 13.5 K, indicating that the low-temperature c-axis polarization might be related to the ordering of the Ho(3+) moment. The lattice constant analyses using x-ray diffraction and the observation of a slight magnetization hysteresis suggest that the weak second magnetic transition along the c-axis at 35 K might be more relevant to the strain-induced effect on antiferromagnetism.
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Affiliation(s)
- T H Lin
- Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan
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17
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Liang KC, Liu HL, Yang HD, Mei WN, Ling DC. Structural and optical studies of high dielectric constant (Na(0.5)A(0.5))Cu(3)Ti(4)O(12) (A = La and Bi). J Phys Condens Matter 2008; 20:275238. [PMID: 21694399 DOI: 10.1088/0953-8984/20/27/275238] [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: 05/30/2023]
Abstract
We report x-ray powder diffraction and temperature-dependent infrared reflectivity measurements of (Na(0.5)La(0.5))Cu(3)Ti(4)O(12) and (Na(0.5)Bi(0.5))Cu(3)Ti(4)O(12) in order to investigate the origin of their lower room-temperature dielectric constants in comparison with the giant value of CaCu(3)Ti(4)O(12). Substituting Ca with Na/La or Na/Bi is found to decrease all Ti-O-Ti angles by the TiO(6) octahedra tilts, resulting in an increase of the local structural disorder on the Na/La and Na/Bi compounds. Further, several infrared-active phonon modes show a broadening in their linewidths, reflecting that the coherency in these vibrational modes is degraded by disorder. Additionally, the lowest-frequency mode of the Ca material is observed to strengthen dramatically at low temperatures, but to a lesser extent in the Na/La and Na/Bi compounds. These results suggest the important role of the local structural disorder on the anomalous low-frequency dielectric response in these materials.
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Affiliation(s)
- K-C Liang
- Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan
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18
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Kim YS, Oh YL, Shon YW, Yang HD, Lee SI, Cho EY, Choi CS, Seo GS, Choi SC, Na YH. A case of buried bumper syndrome in a patient with a balloon-tipped percutaneous endoscopic gastrostomy tube. Endoscopy 2008; 38 Suppl 2:E41-2. [PMID: 17366403 DOI: 10.1055/s-2006-944675] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Y S Kim
- Division of Gastroenterology, Dept. of Internal Medicine, Wonkwang University, Gunpo, South Korea
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Sun SL, Tan ZY, Zhang MY, Yang HD, Zhang HX. Influence of the degree of grafting on the morphology and mechanical properties of blends of poly(butylene terephthalate) and glycidyl methacrylate grafted poly(ethylene-co-propylene) (EPR). POLYM INT 2006. [DOI: 10.1002/pi.2009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
A fine Au powder, with a mean particle diameter of 4 nm, has been successfully fabricated. The crystalline structure of the 4 nm Au nanoparticles remains in fcc symmetry. No structural changes were found between 15 and 450 K. A crossover from a positive thermal expansion at low temperatures to a negative thermal expansion at high temperatures was observed in the fcc cell parameter at about 125 K. Anomalies associated with the crossover were also observed in the magnetic response and the heat capacity measurements. The observations can be reasonably well interpreted by accounting for the effects of the valence electron potential on the equilibrium lattice separations, with a weakly temperature dependent level spacing.
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Affiliation(s)
- W-H Li
- Department of Physics, National Central University, Chung-Li, Taiwan 32054, Republic of China
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Yang HD, Lin JY, Li HH, Hsu FH, Liu CJ, Li SC, Yu RC, Jin CQ. Order parameter of MgB(2): a fully gapped superconductor. Phys Rev Lett 2001; 87:167003. [PMID: 11690227 DOI: 10.1103/physrevlett.87.167003] [Citation(s) in RCA: 3] [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] [Received: 05/01/2001] [Indexed: 05/23/2023]
Abstract
We have measured the low-temperature specific heat C(T) for polycrystalline MgB(2) prepared by high pressure synthesis. C(T) below 10 K vanishes exponentially, which unambiguously indicates a fully opened superconducting energy gap. However, this gap is found to be too small to account for T(c) of MgB(2). Together with the small specific heat jump Delta C/gamma(n)T(c) = 1.09, scenarios such as anisotropic s-wave or multicomponent order parameter are called for. The magnetic field dependence of gamma(H) is neither linear for a fully gapped s-wave superconductor nor H(1/2) for nodal order parameter. It seems that this intriguing behavior of gamma(H) is associated with the intrinsic electronic properties other than flux pinning.
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Affiliation(s)
- H D Yang
- Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
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Chang CF, Lin J, Yang HD. Depression of quasiparticle density of states at zero energy in la1. 9Sr0.1Cu1-xZnxO (4). Phys Rev Lett 2000; 84:5612-5615. [PMID: 10991007 DOI: 10.1103/physrevlett.84.5612] [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] [Received: 09/03/1999] [Indexed: 05/23/2023]
Abstract
We have measured low-temperature specific heat C(T,H) of La 1.9Sr 0. 1Cu 1-xZn xO (4) ( x = 0, 0.01, and 0.02) in both zero and applied magnetic fields. A pronounced dip of C/T below 2 K was observed in Zn-doped samples, which is absent in the nominally clean one. If the origin of the dip in C/T is electronic, the quasiparticle density of states N(E) in Zn-doped samples may be depressed below a small energy scale E0. The present data can be well described by the model N(E) = N(0)+alphaE(1/2), with a nonzero N(0) and positive alpha. Magnetic fields depress N(0) and lead to an increase in E0, while leaving the energy dependence of N(E) unchanged. This novel depression of N(E) below E0 in impurity-doped cuprates cannot be reconciled with the semiclassical self-consistent approximation model. Discussions in the framework based on the nonlinear sigma model field theory and other possible explanations are presented.
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Affiliation(s)
- CF Chang
- Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
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Wu SY, Li W, Lee KC, Lynn JW, Meen TH, Yang HD. Two- and three-dimensional magnetic correlations of Tb in Pb2Sr2TbCu3O8. Phys Rev B Condens Matter 1996; 54:10019-10026. [PMID: 9984739 DOI: 10.1103/physrevb.54.10019] [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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Buan J, Stojkovic BP, Israeloff N, Goldman AM, Huang CC, Valls OT, Jacobs T, Sridhar S, Shih CR, Yang HD, Liu JZ, Shelton R. Experimental investigation of the pairing state of high-temperature superconductors. Phys Rev B Condens Matter 1996; 54:7462-7469. [PMID: 9984373 DOI: 10.1103/physrevb.54.7462] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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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25
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Tsay HL, Chen YC, Juang FL, Wang WM, Yang HD. Occurrence of superconductivity in Ca- and Sr-doped PrSr2Cu2.7Mo0.3O7- delta. Phys Rev B Condens Matter 1996; 53:11340-11343. [PMID: 9982747 DOI: 10.1103/physrevb.53.11340] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Yang HD, Tsay HL, Shih CR, Meen TH, Chen YC. Magnetic-field effect on the specific heat of PrBa2(Cu1-xGax)3O7- delta. Phys Rev B Condens Matter 1995; 52:15099-15102. [PMID: 9980861 DOI: 10.1103/physrevb.52.15099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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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27
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Lin MS, Shieh JH, You YB, Guan WY, Ku HC, Yang HD, Ho JC. Magnetic transitions and nearly reentrant superconducting properties of HoNi2B2C. Phys Rev B Condens Matter 1995; 52:1181-1186. [PMID: 9980698 DOI: 10.1103/physrevb.52.1181] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [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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28
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Yang HD, Tsay HL, Shih CR, Chen YC. Superconductivity and magnetism in Y1-xPrxSr2Cu2.7Mo0.3O7- delta. Phys Rev B Condens Matter 1995; 51:8543-8550. [PMID: 9977469 DOI: 10.1103/physrevb.51.8543] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Shih CR, Meen TH, Chen YC, Yang HD. Calorimetric studies on the magnetic order of Pb2Sr2TbCu3O8+ delta. Phys Rev B Condens Matter 1994; 50:9619-9622. [PMID: 9975025 DOI: 10.1103/physrevb.50.9619] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [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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30
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Lee WH, Yang FA, Shih CR, Yang HD. Crystal structure and superconductivity in the Ni-based ternary compound LaNiSi. Phys Rev B Condens Matter 1994; 50:6523-6525. [PMID: 9977046 DOI: 10.1103/physrevb.50.6523] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [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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Yang HD, Meen TH, Chen YC. Occurrence of weak ferromagnetism in T'-(R1-xYx)2CuO4 (R=Sm and Eu). Phys Rev B Condens Matter 1993; 48:7720-7723. [PMID: 10006951 DOI: 10.1103/physrevb.48.7720] [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 WH, Chang KJ, Hsieh WT, Lee KC, Lynn JW, Yang HD. Magnetic ordering of Pr in PrBa2Cu2.7Zn0.3O7-y. Phys Rev B Condens Matter 1993; 48:519-523. [PMID: 10006802 DOI: 10.1103/physrevb.48.519] [Citation(s) in RCA: 7] [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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Chen T, Zhao ZX, Yang HD, Wolf EL, Shelton RN, Klavins P. Proximity effect of Pb on heavy-fermion CeCu6. Phys Rev B Condens Matter 1992; 45:7945-7950. [PMID: 10000602 DOI: 10.1103/physrevb.45.7945] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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35
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Yang HD, Lin MW. Effects of Zn and Ga substitution on the magnetic properties of PrBa2Cu3O7-y. Phys Rev B Condens Matter 1991; 44:5384-5387. [PMID: 9998366 DOI: 10.1103/physrevb.44.5384] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [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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Yang HD, Chen PF, Hsu CR, Lee CW, Li CL, Peng CC. Suppression of superconductivity in Gd1-xPrxBa2Cu3O7-y and R0.8Pr0.2Ba2Cu3O7-y systems. Phys Rev B Condens Matter 1991; 43:10568-10573. [PMID: 9996784 DOI: 10.1103/physrevb.43.10568] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [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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Swenson CA, Shelton RN, Klavins P, Yang HD. Thermal-expansion measurements for Lu5Ir4Si10, Lu5Rh4Si10, Sc5Ir4Si10, and Tm5Ir4Si10: Charge-density-wave effects. Phys Rev B Condens Matter 1991; 43:7668-7675. [PMID: 9996385 DOI: 10.1103/physrevb.43.7668] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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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Yang HD, Klavins P, Shelton RN. Competition between superconductivity and charge-density waves in the pseudoternary system (Lu1-xScx)5Ir4Si10. Phys Rev B Condens Matter 1991; 43:7681-7687. [PMID: 9996387 DOI: 10.1103/physrevb.43.7681] [Citation(s) in RCA: 6] [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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Yang HD, Klavins P, Shelton RN. Phase transitions in the superconducting compound Lu5Rh4Si10 at ambient and high pressure. Phys Rev B Condens Matter 1991; 43:7676-7680. [PMID: 9996386 DOI: 10.1103/physrevb.43.7676] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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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Yang HD, Klavins P, Shelton RN. Low-temperature physical properties of R5Ir4Si10 (R=Dy, Ho, Er, Tm, and Yb) compounds. Phys Rev B Condens Matter 1991; 43:7688-7694. [PMID: 9996388 DOI: 10.1103/physrevb.43.7688] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [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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Yang HD, Lee WH. Electrical resistivity of the heavy-fermion system CePtSi under pressure. Phys Rev B Condens Matter 1991; 43:3664-3666. [PMID: 9997687 DOI: 10.1103/physrevb.43.3664] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [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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42
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Chu PJ, Gerstein BC, Yang HD, Shelton RN. Studies of the electronic phase transition in Lu5Ir4Si10 and Lu5Rh4Si10 by 175Lu-NMR. Phys Rev B Condens Matter 1988; 37:1796-1806. [PMID: 9944697 DOI: 10.1103/physrevb.37.1796] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Yang HD, Ku HC, Klavins P, Shelton RN. Magnetic ordering and magnetization in the high-temperature superconductor ErBa2Cu. Phys Rev B Condens Matter 1987; 36:8791-8793. [PMID: 9942709 DOI: 10.1103/physrevb.36.8791] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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44
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Gangopadhyay AK, Schilling JS, Yang HD, Shelton RN. Ce(Cu0.9Ag0.1)6: Highest electronic specific-heat coefficient of the heavy-fermion systems. Phys Rev B Condens Matter 1987; 36:4086-4089. [PMID: 9943386 DOI: 10.1103/physrevb.36.4086] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Lynn JW, Li WH, Li Q, Ku HC, Yang HD, Shelton RN. Magnetic fluctuations and two-dimensional ordering in ErBa2Cu. Phys Rev B Condens Matter 1987; 36:2374-2377. [PMID: 9943106 DOI: 10.1103/physrevb.36.2374] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Shelton RN, Hausermann-Berg LS, Klavins P, Yang HD, Anderson MS, Swenson CA. Electronic phase transition and partially gapped Fermi surface in superconducting Lu5Ir4Si10. Phys Rev B Condens Matter 1986; 34:4590-4594. [PMID: 9940249 DOI: 10.1103/physrevb.34.4590] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Shelton RN, Hausermann-Berg LS, Johnson MJ, Klavins P, Yang HD. Coexistence of superconductivity and long-range magnetic order in ErPd2Sn. Phys Rev B Condens Matter 1986; 34:199-202. [PMID: 9939252 DOI: 10.1103/physrevb.34.199] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Yang HD, Shelton RN, Braun HF. Superconductivity and electronic instability at high pressure in Sc5Co4Si10-type compounds. Phys Rev B Condens Matter 1986; 33:5062-5065. [PMID: 9938984 DOI: 10.1103/physrevb.33.5062] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Hayashi Y, Nagata M, Yoshizumi H, Mori R, Navarro CV, Yang HD. Difference in age distribution of antibody to herpes simplex virus in Fukuoka, Manila and Busan. Jpn J Med Sci Biol 1984; 37:35-9. [PMID: 6330406 DOI: 10.7883/yoken1952.37.35] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Age distribution of antibody to herpes simplex virus (HSV) in Fukuoka, Manila and Busan was investigated by the neutralization test. The results show that a large number of young people lack antibody to HSV in Fukuoka, but not in Manila or Busan. In Manila and Busan, the rates of positive neutralizing antibody to HSV in younger generations are maintained at high levels, showing a significant difference from that of Fukuoka. Such difference is considered to have been derive from the different socioeconomical standards and sanitary conditions.
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