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Shen Jialei,Liu Haiyan,Ma Huihuang,Chang Yao,Zhou Xiaodong 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.1
Due to the significant photothermal damage caused by lasers, there is a need to explore new materials that possess excellent insulation and laser protection properties. In this study, the in situ solution gel method was employed to fabricate a methyltrimethoxysilane (MTMS) modified composite of glass fiber (GF) reinforced Al2O3–SiO2 aerogel. The laser protection capability of aerogel composites with varying ratios of Al/Si was investigated, while the laser ablation behavior of the materials was characterized using FESEM and FT-IR. The results indicate that the composite aerogel material with an Al/Si molar ratio of 3:1 exhibits a high damage threshold temperature and can withstand continuous laser exposure (3500 W/cm2) for 59 s. These findings suggest that Al2O3–SiO2 aerogel composites hold promising potential for applications in laser protection. The pore structure of the aerogel in the region affected by scattering damage is disrupted and appears black, emitting intense visible light upon laser irradiation. In the central ablative melting area, it is evident that the glass fiber and aerogel have undergone complete ablation and melting.
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Inhibition of Dll4/Notch1 pathway promotes angiogenesis of Masquelet’s induced membrane in rats
Qian Tang,Haimin Jin,Minji Tong,Gang Zheng,Zhongjie Xie,Shangkun Tang,Jialei Jin,Ping Shang,Huazi Xu,Liyan Shen,Yu Zhang,Haixiao Liu 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
The Masquelet’s induced membrane technique for repairing bone defects has been demonstrated to be a promising treatment strategy. Previous studies have shown that the vessel density of induced membrane is decreased in the late stage of membrane formation, which consequently disrupts the bone healing process. However, relatively little is known about certain mechanisms of vessel degeneration in the induced membrane tissue and whether promotion of angiogenesis in induced membranes can improve bone regeneration. Here, we showed that the Delta-like ligand 4/ Notch homolog 1 (Dll4/Notch1) pathway was relatively activated in the late stage of induced membrane, especially at the subcutaneous site. Then, DAPT, a classical γ-secretase inhibitor, was applied to specifically inhibit Notch1 activation, followed by up-regulation of vascular endothelial growth factor receptor 2 (VEGFR2) and CD31 expression. DAPTmodified induced membranes were further confirmed to contribute to bone regeneration after autogenous bone grafting. Finally, in vitro experiments revealed that knocking down Notch1 contributed to the functional improvement of endothelial progenitor cells (EPCs) and that DAPT-treated induced membrane tissue was more favorable for angiogenesis of EPCs compared with the vehicle group. In conclusion, the present findings demonstrate that Dll4/ Notch1 signaling is negatively associated with the vessel density of induced membrane. Pharmacological inhibition of Notch1 attenuated the vessel degeneration of induced membrane both in vitro and in vivo, which consequently improved bone formation at the bone defect site and graft resorption at the subcutaneous site.
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