Search

Your search keyword '"Qin, Xiaofei"' showing total 292 results
Start Over Author "Qin, Xiaofei" Language english
292 results on '"Qin, Xiaofei"'

34. Characterization of a full‐thickness decellularized and lyophilized human placental membrane for clinical applications.

Author

Wetzell, Bradley, Ork, Britini, Softic, Davorka, Morse, Jennifer, Hutchens, William, Meng, Fanwei, McLean, Julie B., Moore, Mark A., and Qin, Xiaofei

Subjects
TREATMENT of diabetic foot, PLACENTA, MATERIALS testing, BIOLOGICAL models, IN vitro studies, BIOMECHANICS, FREEZE-drying, TROPHOBLAST, CELL proliferation, HOMOGRAFTS, IN vivo studies, DESCRIPTIVE statistics, FIBROBLASTS, RATS, ANIMAL experimentation, SCANNING electron microscopy, DENTISTRY, TENDINOPATHY, EXTRACELLULAR matrix, WOUND care, BIOMARKERS
Abstract

Allografts derived from live‐birth tissue obtained with donor consent have emerged as an important treatment option for wound and soft tissue repairs. Placental membrane derived from the amniotic sac consists of the amnion and chorion, the latter of which contains the trophoblast layer. For ease of cleaning and processing, these layers are often separated with or without re‐lamination and the trophoblast layer is typically discarded, both of which can negatively affect the abundance of native biological factors and make the grafts difficult to handle. Thus, a full‐thickness placental membrane that includes a fully‐intact decellularized trophoblast layer was developed for homologous clinical use as a protective barrier and scaffold in soft tissue repairs. Here, we demonstrate that this full‐thickness placental membrane is effectively decellularized while retaining native extracellular matrix (ECM) scaffold and biological factors, including the full trophoblast layer. Following processing, it is porous, biocompatible, supports cell proliferation in vitro, and retains its biomechanical strength and the ability to pass through a cannula without visible evidence of movement or damage. Finally, it was accepted as a natural scaffold in vivo with evidence of host‐cell infiltration, angiogenesis, tissue remodelling, and structural layer retention for up to 10 weeks in a murine subcutaneous implant model. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

46. Carbon-Coated Ni-Fe Nanocatalysts: Bridging the Gap in Cinnamaldehyde Hydrogenation Performance and Durability.

Author

Cai, Yuhang, Yin, Anping, Zhang, Jianxiang, Wang, Jiatai, Qin, Xiaofei, Yang, Yibo, Qin, Gaolei, Sun, Xiaodong, He, Peng, and Yang, Yong

Subjects
BIMETALLIC catalysts, NANOPARTICLES, X-ray photoelectron spectroscopy, METALLIC oxides, TRANSMISSION electron microscopy
Abstract

This study focuses on the synthesis and evaluation of carbon−coated Ni−Fe alloy catalysts (NiFex@C, x = 0, 0.3, 0.7, 1.1) for the hydrogenation of cinnamaldehyde. The catalysts were characterized using Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Raman spectroscopy, and X-ray Photoelectron Spectroscopy (XPS). The introduction of Fe was found to increase the average particle size of the bimetallic catalysts compared to the monometallic Ni@C. Ni existed in both metallic and oxide states, while Fe exhibited multiple oxidation states in the bimetallic catalysts. The carbon layer, approximately 2–3 nm thick, was confirmed to envelop the alloy particles. The catalytic performance of carbon−coated Ni−Fe alloy catalysts indicated that the addition of Fe to Ni@C enhanced the selectivity towards hydrocinnamaldehyde (HCAL), with NiFe0.7@C showing the highest selectivity (~88.6%) but at a reduced conversion rate. The carbon layer played a pivotal role in the stability and reusability of the catalysts. NiFe0.7@C maintained consistent performance over multiple reaction cycles, while NiFe0.7 NPs (without a carbon layer) exhibited significant deactivation. Both catalysts displayed strong magnetism, facilitating easy separation from the reaction mixture. This study sheds light on the significance of the carbon layer in bimetallic catalysts and provides valuable insights for designing efficient catalysts for hydrogenation processes. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

47. Secondary aerosol formation during a special dust transport event: impacts from unusually enhanced ozone and dust backflows over the ocean.

Author

Lu, Da, Li, Hao, Tian, Mengke, Wang, Guochen, Qin, Xiaofei, Zhao, Na, Huo, Juntao, Yang, Fan, Lin, Yanfen, Chen, Jia, Fu, Qingyan, Duan, Yusen, Dong, Xinyi, Deng, Congrui, Abdullaev, Sabur F., and Huang, Kan

Subjects
MINERAL dusts, DUST, OZONE, AEROSOLS, ALKALI metal ions, PARTICULATE matter, WIND speed
Abstract

In the autumn of 2019, a 5 d long-lasting dust event was observed using a synergy of field measurement techniques in Shanghai. This particular dust event stood out from others due to its unique characteristics, including low wind speed, high relative humidity, elevated levels of gaseous precursors, and contrasting wind patterns at different altitudes. During this event, three distinct dust stages were identified. The first stage was a typical dust invasion characterized by high concentrations of particulate matters but relatively short duration. In contrast, the second stage exhibited an unusual enhancement of ozone, attributed to compound causes of a weak synoptic system, transport from the ocean, and subsidence of high-altitude ozone downdrafted by dust. Consequently, gas-phase oxidation served as the major formation pathway of sulfate and nitrate. In the third stage of dust, a noteworthy phenomenon known as dust backflow occurred. The dust plume originated from the Shandong Peninsula and slowly drifted over the Yellow Sea and the East China Sea before eventually returning to Shanghai. Evidence of this backflow was found through the enrichment of marine vessel emissions (V and Ni) and increased solubility of calcium. Under the influence of humid oceanic breezes, the formation of nitrate was dominated by aqueous processing. Additionally, parts of nitrate and sulfate were directly transported via sea salts, evidenced by their co-variation with Na + and confirmed through thermodynamic modeling. The uptake of NH 3 on particles, influenced by the contributions of alkali metal ions and aerosol pH, regulated the formation potential of secondary aerosol. By developing an upstream–receptor relationship method, the quantities of transported and secondarily formed aerosol species were separated. This study highlights that the transport pathway of dust, coupled with environmental conditions, can significantly modify the aerosol properties, especially at the complex land–sea interface. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results