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395 results on '"Liang, M-H."'

12. Optical characteristics of a-plane ZnO/Zn0.8Mg0.2O multiple quantum wells grown by pulsed laser deposition.

Author

Ko, T. S., Lu, T. C., Zhuo, L. F., Wang, W. L., Liang, M. H., Kuo, H. C., Wang, S. C., Chang, Li, and Lin, D. Y.

Subjects
OPTICAL properties, ZINC oxide, QUANTUM wells, PULSED laser deposition, POTENTIAL theory (Physics)
Abstract

We reported optical properties of a-plane ZnO/ZnMgO multiple quantum wells (MQWs) structure grown by the pulse laser deposition system. The emission peak energy of a-plane ZnO/ZnMgO MQWs kept invariant in the power-dependent photoluminescence (PL) measurement, indicating the nonpolar characteristics due to the lack of built-in electric fields. Large exciton binding energy of 68 meV was deduced and no apparent S-curve appeared in temperature-dependent PL results, demonstrating less carrier localization effect in a-plane ZnO/ZnMgO MQWs. Large difference in electronic transition levels of 45 meV due to the valence band splitting was observed in the polarization dependent absorption spectrum. Furthermore, the high degree of polarization of 92% and 56% at 20 and 300 K in PL emission of a-plane ZnO/ZnMgO MQWs were obtained. [ABSTRACT FROM AUTHOR]

Published
2010
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13. Variable lengths of stay among ischemic stroke subtypes in Chinese general teaching hospitals.

Author

Malaga, G, Li, Y, Liu, H, Wang, J, Yu, G-P, Ma, X-M, Liang, M-H, Zhang, J, Zhao, LP, Malaga, G, Li, Y, Liu, H, Wang, J, Yu, G-P, Ma, X-M, Liang, M-H, Zhang, J, and Zhao, LP

Abstract

BACKGROUND: Length of stay (LOS) is one of the most important quantitative indexes that measures health service utilization within a hospital. Many studies have examined the association of three major stroke categories with LOS. Our aim is to investigate the differences of LOS among ischemic stroke subtypes, results from which are helpful to healthcare providers and government agencies to improve health care delivery efficiency. METHODOLOGY/PRINCIPAL FINDINGS: Using the Beijing Municipal Health Bureau's hospitalization summary reports, we performed a retrospective study among first-ever in-hospital patients with ischemic stroke (ICD-10 I63) in three general teaching hospitals in Beijing, China, from 2006 to 2010 with generalized linear model. In our study, 5,559 patients (female, 36.0%; age, 64.4 ± 12.9 years) were included. The estimated mean LOS of ischemic stroke was 17.4 ± 1.8 days. After adjusting for confounders, LOS of lacunar infarction (14.7 days; p<0.001) and LOS of small cerebral infarction (17.0 days; p=0.393) were shorter than that of single cerebral infarction (17.9 days, p<0.001). LOS of multi-infarct (19.0 days; p=0.028), brainstem infarction (19.3 days; p=0.045), basal ganglia infarction (18.5 days; p=0.452) and other subtypes of ischemic stroke (18.9 days; p=0.327) were longer than that of single cerebral infarction. CONCLUSIONS: LOS of ischemic stroke patient differes across single cerebral infarction, lacunar infarction, multi-infarct and brainstem infarction patients. The ascending order of LOS was lacunar infarction, small cerebral infarction, single cerebral infarction, basal ganglia infarction, other subtypes of ischemic stroke, multi-infarct and brainstem infarction.

Published
2012

14. OP0035 Progress Report on the Development of New Classification Criteria for Adult and Juvenile Idiopathic Inflammatory Myopathies

Author

Tjärnlund, A., primary, Bottai, M., additional, Rider, L. G., additional, Werth, V. P., additional, Pilkington, C., additional, de Visser, M., additional, Alfredsson, L., additional, Amato, A. A., additional, Barohn, R. J., additional, Liang, M. H., additional, Singh, J. A., additional, Miller, F. W., additional, and Lundberg, I. E., additional

Published
2013
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49. Exposure to maternal smoking and incident SLE in a prospective cohort study.

Author

Simard, J. F., Costenbader, K. H., Liang, M. H., Karlson, E. W., and Mittleman, M. A.

Subjects
SYSTEMIC lupus erythematosus, SMOKING, CIGARETTE smoke, DISEASE risk factors, WOMEN'S tobacco use, PREGNANT women, AUTOIMMUNE diseases
Abstract

Current cigarette smoking is a risk factor for SLE, and recent work has demonstrated that early-life smoke exposure was related to the risk of related rheumatic conditions in female children. Therefore, we sought to investigate whether early-life cigarette smoke exposure might be associated with incidence of SLE in adult women. We studied 93,054 Nurses' Health Study (NHS) and 95,554 NHSII participants free of SLE at baseline who provided information on perinatal exposures. By medical record review, 236 incident SLE cases were confirmed (142 NHS and 94 NHSII) among these women using American College of Rheumatology criteria. We used stratified Cox models to estimate the association of smoke exposure with SLE adjusting for race, birth weight, preterm birth and parents' occupation. Combined estimates were computed using random effects meta-analytic techniques. Maternal cigarette smoking did not increase the risk of SLE (relative risk (RR) = 0.9, 95%CI: 0.6 to 1.4) nor did paternal smoking during the participant's childhood (RR = 1.0, 95% CI: 0.8 to 1.3) in combined analyses. Early-life exposure to cigarette smoke due to mothers' or fathers' smoking was not associated with increased risk of adult-onset SLE in women. [ABSTRACT FROM AUTHOR]

Published
2009
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50. A controlled comparison of brachial artery flow mediated dilation (FMD) and digital pulse amplitude tonometry (PAT) in the assessment of endothelial function in systemic lupus erythematosus.

Author

Aizer, J., Karlson, E. W., Chibnik, L. B., Costenbader, K. H., Post, D., Liang, M. H., Gall, V., and Gerhard-Herman, M. D.

Subjects
BRACHIAL artery, SYSTEMIC lupus erythematosus, AUTOIMMUNE diseases, CARDIOVASCULAR diseases, KIDNEY diseases
Abstract

The utility of flow mediated dilation (FMD) a measure of endothelial function is limited by operator dependence. Pulse amplitude tonometry (PAT) is a novel, less operator-dependent technique to assess endothelial function. This study compares PAT to FMD in SLE and controls. Thirty women with SLE and 31 controls were enrolled.Medications, cardiovascular disease and risk factors, SLE activity (SLAM-R) and damage (SLICC-DI) were recorded. FMD and PAT were performed simultaneously. Endothelium-independent function was assessed with nitroglycerin. Average age was 48.3 ± 10.1 years, SLE duration 16.2 years, SLAM-R 8.3 and SLICC-DI 1.0. Framingham Risk Scores were ≤2% in most subjects. There were no differences between SLE cases and controls in FMD, PAT or response to nitroglycerin. This study found no association between FMD and PAT in SLE or controls. In the 17 SLE cases with a history of Raynaud's, correlation between FMD and PAT was 0.50 (P = 0.04). There was no difference in endothelial function assessed by FMD or PAT in SLE cases versus controls. FMD did not correlate with PAT except in SLE cases with a history of Raynaud's. Correlation between FMD and PAT may be stronger in populations with greater variation in endothelial function and more cardiovascular risk factors. [ABSTRACT FROM AUTHOR]

Published
2009
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