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Meng Lan,Manli Wang,Nan Zheng,Xiaoli Dong,Yu Wang,Jiefeng Gao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Increasing organic pollutants have seriously affected the ecological environment and human health, photocatalytictechnology is considered as one of the most effective and environmentally friendly treatmentmethods. In this work, a novel hierarchical polyurethane (PU)/reduced graphene oxide (RGO)/bismuthoxyiodide (BiOI) composite fiber photocatalyst is constructed via an energy-saving route consisted ofultrasonic-assisted and co-precipitation method by utilizing PU nanofibers as substrate. The RGO are firstevenly wrapped in the PU nanofiber surface and BiOI nanosheets are then uniformly grown on the PU/RGO surface to form the hierarchical PU/RGO/BiOI composite fibers with a core–shell structure. The composition,morphology and electrochemical performance of the obtained PU/RGO/BiOI were characterizedby XRD, XPS, SEM, BET, I-t and EIS. Benefited from the high specific surface area of the PU nanofiber andthe excellent electron transfer ability of the RGO, a remarkable photocatalytic activity was achieved forthe PU/RGO/BiOI composite fibers and the degradation rate of RhB is 93.2% within 180 min. Notably, comparedto the traditional suspended nanoparticles, the PU/RGO/BiOI fibers exhibit excellent flexibility andself-supporting property, and can be easily separated and recovered from the contaminated water. Thus,the obtained PU/RGO/BiOI composite fibers with high photocatalytic activity and easily separable propertyare expected to possess great potential in water purification.
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Mei Liu,Yichun Wang,Mengting Li,Hongyan Feng,Qingyao Liu,Chunxia Qin,Yongxue Zhang,Xiaoli Lan 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
The study aimed to investigate the feasibility of noninvasive monitoring of bone marrow mesenchymal stem cells (MSCs) transduced with the tyrosinase reporter gene for acute myocardial infarction (AMI) with photoacoustic imaging (PAI), magnetic resonance imaging (MRI), and positron emission tomography (PET) in vitro and in vivo. MSCs were transduced with a lentivirus carrying a tyrosinase reporter gene. After transduction, the rate of 18F-5-fluoro-N-(2- [diethylamino]ethyl)picolinamide (18F-5-FPN) uptake was measured. PAI and MRI of stable cell lines expressing tyrosinase (TYR-MSCs) were performed in vitro. An AMI model was induced and verified. TYR-MSCs and MSCs were injected into the margins of the infarcted areas, and PAI, MRI, and PET images were acquired 1, 7, 14, 21, and 28 days after cell injection. Sham-operated models without injection were used as the control group. TYR-MSCs showed noticeably higher uptake of 18F-5-FPN and stronger signals in T1-weighted MRI and PAI than non-transduced MSCs. In vivo studies revealed prominent signals in the injected area of the infarcted myocardium on PAI/MRI/PET images, whereas no signal could be seen in rats injected with non-transduced MSCs or sham-operated rats. The uptake values of 18F-5-FPN in vivo showed a slight decrease over 28 days, whereas MRI and PAI signal intensity decreased dramatically. MSCs stably transduced with the tyrosinase reporter gene could be monitored in vivo in myocardial infarction models by PET, MRI, and PAI, providing a feasible and reliable method for checking the viability, location, and dwell time of transplanted stem cells.
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