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103 results on '"Wang, Si-cong"'

2. Imaging Single Prussian Blue Nanoparticles with Extraordinary Low-Spin Iron Capacity

Author

Wang, Si-Cong, Ma, Junjie, Wang, Xinyue, Xie, Ruo-Chen, and Wang, Wei

Abstract

In attempts to obtain high-capacity Prussian blue nanomaterials, current efforts are predominantly focused on the particle-ensemble-level understanding of their structure–activity relationships. Complementarily, it would be insightful to screen out extraordinary individuals from the nanoparticle population. Using a simple and efficient technique of bright-field microscopy, this work enables, for the first time, quantitative characterization of the overall two-redox-center electrochemistry of single Prussian blue nanoparticles many at a time. Quantitative optical voltammograms with little interference from solvent breakdown and non-Faradaic electrode charging/discharging are extracted for each single nanoparticle, revealing clear heterogeneity among them. On this basis, the microscopic method allows a detailed comparative analysis between the two redox-active sites. It is found that while the synthesized nanoparticles show a similar specific capacity of the high-spin (HS-Fe) sites with STD/mean = 30%, most individual nanoparticles exhibit monodispersedly small capacities of the low-spin iron (LS-Fe) sites, only about 17±1of the HS-Fe capacity. Most importantly, it is discovered that there is always a small fraction (∼8%) of the single nanoparticles showing an impressively tripled LS-Fe capacity. Facilitated by optical imaging, the discovery of this easily overlooked extraordinary subpopulation confers alternative opportunities for targeted efforts for material chemists to improve synthesis and material design based on these unusual individuals, which in turn implies the general significance of nanoparticle screening.

Published
2024
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8. Progress in Research on Luminescence Properties and Modification of SiC

Author

WANG Si-cong, JI Ling-fei, WU Yan, ZHANG Yong-zhe, and YAN Yin-zhou

Subjects
SiC, wide-band semiconductor, luminescence, luminescence modification, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

As a typical material of the third-generation semiconductor with wide band gap, high thermal conductivity and high critical breakdown electric field, silicon carbide(SiC) has a huge potential in the applications of photoelectric devices that can work in some extreme conditions, such as in a high temperature or intense radiation environment. Here, the research status of luminescence properties and applications of SiC was summarized. The preparation methods and characteristic luminescence of monocrystal, nanocrystalline and thin film of SiC were presented. Besides, the progress and prospect of SiC luminescence control was also discussed in this paper. Utilizing the emerging technologies, we will be able to modify SiC's properties like luminescence spectrum and efficiency.

Published
2017
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10. Clinical characteristics of patients with COVID-19 presenting with gastrointestinal symptoms as initial symptoms: Retrospective case series

Author

Yang, Tuo-Yun, Li, Yuan-Chao, Wang, Si-Cong, Dai, Qing-Qing, Jiang, Xue-Song, Zuo, Shu, Jia, Liu, Zheng, Jun-Bo, and Wang, Hong-Liang

Subjects
Hospitalization, Retrospective Study, COVID-19, Viral transmission, Initial symptoms, Gastrointestinal symptoms
Abstract

BACKGROUND A large number of pneumonia cases due to coronavirus disease 2019 (COVID-19) have been first reported in China. Meanwhile, the virus is sweeping all around the world and has infected millions of people. Fever and pulmonary symptoms have been noticed as major and early signs of infection, whereas gastrointestinal symptoms were also observed in a significant portion of patients. The clinical investigation of disease onset was underestimated, especially due to the neglection of cases presenting with gastrointestinal symptoms. AIM To characterize the clinical features of coronavirus-infected patients with gastrointestinal symptoms as initial symptoms. METHODS This is a retrospective, single-center case series of the general consecutive hospitalized patients with confirmed COVID-19 at Wuhan Union Hospital from February 2, 2020 to February 13, 2020. According to their initial symptoms, these patients were classified into two groups. Patients in group one presented with pulmonary symptoms (PS) as initial symptoms, and group two presented with gastrointestinal symptoms (GS). Epidemiological, demographic, clinical, laboratory, and treatment data were collected for analysis. RESULTS Among the 50 patients recruited, no patient has been admitted to intensive care units, and no patient died during the study. The duration of hospitalization was longer in the GS group than in the PS group (12.13 ± 2.44 vs 10.00 ± 2.13, P < 0.01). All of the 50 patients exhibited decreased lymphocytes. However, lymphocytes in the GS group were significantly lower compared to those in the PS group (0.94 ± 0.06 vs 1.04 ± 0.15, P < 0.01). Procalcitonin and hs-CRP were both significantly higher in the GS group than in the PS group. Accordingly, the duration of viral shedding was significantly longer in the GS group compared to the PS group (10.22 ± 1.93 vs 8.15 ± 1.87, P < 0.01). CONCLUSION COVID-19 patients presenting with gastrointestinal symptoms as initial symptoms need more days of viral shedding and hospitalization than the patients presenting with pulmonary symptoms.

Published
2020

19. Mechanisms of Renal-Splenic Axis Involvement in Acute Kidney Injury Mediated by the α7nAChR-NF-κB Signaling Pathway

Author

Gao, Yang, primary, Kang, Kai, additional, Liu, Yan-song, additional, Li, Na-na, additional, Han, Qiu-yuan, additional, Liu, Hai-tao, additional, Kong, Wei-lan, additional, Zhang, Xing, additional, Huang, Rui, additional, Yang, Zhen-yu, additional, Qi, Zhi-dong, additional, Zheng, Jun-bo, additional, Li, Ming, additional, Wang, Hong-liang, additional, Li, Jia-yu, additional, Liu, Rui-jin, additional, Wang, Si-cong, additional, Zhang, Wei-hua, additional, Zhao, Ming-yan, additional, and Yu, Kai-jiang, additional

Published
2020
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35. A multi-center cross-sectional study on blood purification among adult patients in intensive care unit in China

Author

Gao, Yang, primary, Qi, Zhi-Dong, additional, Liu, Rui-Jin, additional, Liu, Hai-Tao, additional, Han, Qiu-Yuan, additional, Zhang, Xing, additional, Huang, Rui, additional, Li, Ming, additional, Yang, Zhen-Yu, additional, Zheng, Jun-Bo, additional, Qu, Jing-Dong, additional, Wang, Si-Cong, additional, Liu, Yan-Song, additional, Wang, Hong-Liang, additional, and Yu, Kai-Jiang, additional

Published
2019
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41. Dexmedetomidine protects against lipopolysaccharide-induced sepsis-associated acute kidney injury via an α7 nAChR-dependent pathway

Author

Kang, Kai, primary, Gao, Yang, additional, Wang, Si-Cong, additional, Liu, Hai-Tao, additional, Kong, Wei-Lan, additional, Zhang, Xing, additional, Huang, Rui, additional, Qi, Zhi-Dong, additional, Zheng, Jun-Bo, additional, Qu, Jing-Dong, additional, Liu, Rui-Jin, additional, Liu, Yan-Song, additional, Wang, Hong-Liang, additional, and Yu, Kai-Jiang, additional

Published
2018
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48. In vitro assessment of 24 CYP2D6 allelic isoforms on the metabolism of methadone.

Author

Su, Ying, Zhan, Yun‐yun, Wang, Ben‐fu, Wang, Si‐Cong, Dai, Da‐peng, Hu, Guo‐xin, Lin, Han, Lian, Qing‐quan, and Cai, Jian‐ping

Abstract

CYP2D6 is an important member of the cytochrome P450 (CYP450) enzyme super family, with at least 100 CYP2D6 alleles being previously identified. Genetic polymorphisms of CYP2D6 significantly influence the efficacy and safety of some drugs, which might cause adverse effects and therapeutic failure. The aim of this study was to clarify the catalytic activities of 24 CYP2D6 alleles on the oxidative in vitro metabolism of methadone. Reactions were incubated with 50-2000 µM methadone for 30 min at 37 °C and terminated by cooling to -80 °C immediately. Methadone and the major metabolite EDDP were analyzed by an ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) system. Compared with wild-type CYP2D6*1, most variants showed significantly altered values in Vmax and intrinsic clearance (Vmax/Km). Only three variants (CYP2D6*88, *91 and E215K) exhibited markedly increased intrinsic clearance values, and one variant CYP2D6*94 showed no significant difference. On the other hand, the kinetic parameters of two CYP2D6 variants (CYP2D6*92 and *96) could not be determined because they had no detectable enzyme activity, whereas 18 variants exhibited significantly decreased values. To sum up, this study demonstrated that more attention should be paid in clinical administration of methadone to individuals carrying these CYP2D6 alleles. Copyright © 2016 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2017
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50. Efficient color routing with a dispersion-controlled waveguide array

Author

Liu, Yi-Kun, Wang, Si-Cong, Li, Yong-Yao, Song, Li-Yan, Xie, Xiang-Sheng, Feng, Ming-Neng, Xiao, Zhi-Ming, Deng, Shao-Zhi, Zhou, Jian-Ying, Li, Jun-Tao, Wong, Kam Sing, Krauss, Thomas F., Liu, Yi-Kun, Wang, Si-Cong, Li, Yong-Yao, Song, Li-Yan, Xie, Xiang-Sheng, Feng, Ming-Neng, Xiao, Zhi-Ming, Deng, Shao-Zhi, Zhou, Jian-Ying, Li, Jun-Tao, Wong, Kam Sing, and Krauss, Thomas F.

Abstract

Splitting white light into its constituent spectral components has been of interest ever since Newton first discovered the phenomenon of color separation. Many devices have since been conceived to achieve efficient wavelength separation, yet a large number of applications, e. g., in display technology, still use simple color absorption or rejection filters that absorb or reflect unwanted wavelengths, thus wasting luminous energy. Here, we demonstrate a novel microsized device concept that enables efficient color routing. The device operation is based on differential material dispersion in a waveguide array, which causes different wavelength signals to couple selectively into appropriate waveguides. A theoretical power delivery of greater than 50% for a tricolor wavelength router is obtained, compared to 33% expected from geometry alone. The principle of operation is demonstrated experimentally for a dual-color light field, where we achieve a higher than 70% routing efficiency (compared to 50% from geometry), thus highlighting the feasibility of this novel and promising approach.

Published
2013

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