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- 저자 : Haojie Yu (검색결과 5 건)
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Fazal Haq,Haojie Yu,Li Wang,Lisong Teng,Sahid Mehmood,Muhammad Haroon,Bilal-Ul-Amin,Shah Fahad,Md Alim Uddin,Di Shen 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.5
Cigarette industry plays an important role in the economy of the advanced countries. But the cigarette smoke contains toxic chemicals such as phenol which causes various kind of diseases and affect human life. In this paper, we synthesized carboxymethyl starch grafted poly vinyl imidazole (CMS-g-PVIs) by reacting carboxymehtyl starch (CMS) with vinyl imidazole (VI). The structures of the CMS-g-PVIs were investigated by 1H NMR and FT-IR. The crystalline properties of the CMS and CMS-g-PVIs were checked by XRD. The thermal properties of the original CMS and CMS-g-PVIs were investigated by TGA analysis. It was found that the modified starches had high thermal stability due to aromatic imidazole ring. The modified starches also showed more rough and distorted morphology as compared to native CMS. The CMS-g-PVIs were subjected for phenol adsorption and showed adsorption efficiencies of 0.170 g/g, 0.190 g/g, 0.192 g/g and 0.199 g/g for CMS, CMS-g-PVI 1, CMS-g-PVI 2 and CMS-g-PVI 3, respectively. Due to higher grafting ratio, CMS-g-PVI 3 showed good adsorption efficiency of 0.199 g/g for phenol. The obtained results showed that the grafting of vinyl imidazole on CMS can increase the adsorption efficiency of native CMS towards phenol.
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Sahid Mehmood,Haojie Yu,Li Wang,Md Alim Uddin,Bilal Ul Amin,Fazal Haq,Shah Fahad,Muhammad Haroon 한국고분자학회 2022 Macromolecular Research Vol.30 No.9
In this work, cross-linked poly(cyclotriphosphazene-co-phloretin) (PCTPPT) microspheres were synthesized and characterized by Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscope (SEM). In FT-IR spectra, the new appeared bands at 1009 cm-1 and 1132 cm-1 confirmed the successful polymerization between hexachlorocyclotriphosphazene (HCCP) and phloretin (Pht). While the SEM results showed that the size of the microspheres was strongly dependent on the HCCP:Pht mole ratio. The crystalline nature of the PCTPPT microspheres was checked by X-ray diffraction (XRD) and provided evidence for the successful preparation of the microspheres. The thermal stability of the PCTPPT microspheres was investigated by thermogravimetric analysis (TGA). The obtained TGA results showed that the increase in thermal stability was attributed to the highly cross-linked covalently bonded structure of PCTPPT microspheres. The particle size distribution was determined by dynamic light scattering (DLS) and the results showed that the decreased HCCP:Pht mole ratio increases the size of the microspheres. The PCTPPT-3 microspheres were used as drug carriers for a model drug camptothecin (CPT). The experimental findings showed a cumulative release of 41.0% in pH 4.0 and 32.6% in pH 7.4 after 350 h and the PCTPPT-3/CPT microspheres have good drug loading capability and controlled release property for CPT.
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Wang Feng,Min Hong Sung,Shan Haojie,Yin Fuli,Jiang Chaolai,Zong Yang,Ma Xin,Lin Yiwei,Zhou Zubin,Yu Xiaowei 대한면역학회 2022 Immune Network Vol.22 No.3
IL-34 can promote osteoclast differentiation and activation, which may contribute to steroid-induced osteonecrosis of the femoral head (ONFH). Animal model was constructed in both BALB/c and IL-34 deficient mice to detect the relative expression of inflammation cytokines. Micro-CT was utilized to reveal the internal structure. In vitro differentiated osteoclast was induced by culturing bone marrow-derived macrophages with IL-34 conditioned medium or M-CSF. The relative expression of pro-inflammation cytokines, osteoclast marker genes, and relevant pathways molecules was detected with quantitative real-time RT-PCR, ELISA, and Western blot. Up-regulated IL-34 expression could be detected in the serum of ONFH patients and femoral heads of ONFH mice. IL-34 deficient mice showed the resistance to ONFH induction with the up-regulated trabecular number, trabecular thickness, bone value fraction, and down-regulated trabecular separation. On the other hand, inflammatory cytokines, such as TNF-α, IFN-γ, IL-6, IL-12, IL-2, and IL-17A, showed diminished expression in IL-34 deficient ONFH induced mice. IL-34 alone or works in coordination with M-CSF to promote osteoclastogenesis and activate ERK, STAT3, and non-canonical NF-κB pathways. These data demonstrate that IL-34 can promote the differentiation of osteoclast through ERK, STAT3, and non-canonical NF-κB pathways to aggravate steroid-induced ONFH, and IL-34 can be considered as a treatment target.
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A Comparison of Eu-Doped -Fe2O3 Nanotubes and Nanowires for Acetone Sensing
Yali Cheng,Yifang Wang,Jinbao Zhang,Haiying Li,Li Liu,Yu Lina,Liting Du,Haojie Duan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.11
Pure and Eu-doped (1.0, 3.0, 5.0 wt.%) α-Fe2O3 (PFO and EFO) nanotubes and nanowires have been successfully synthesized through the combination of electrospinning and calcination techniques. The structures, morphologies and chemical compositions of the as-obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric and differential scanning calorimetry (TG-DSC) and energy dispersive spectrum (EDS), respectively. To demonstrate the superior gas sensing performance of the doped nanotubes, a contrastive gas sensing study between PFO (EFO) nanotubes and nanowires was performed. It turned out that Eu doping could magnify the impact of morphology on gas sensitivity. Specifically, at the optimum operating temperature of 240 ℃, the response value of PFO nanotubes to 100 ppm acetone is slightly higher than that of nanowires (3.59/2.20). EFO (3.0 wt.%) nanotubes have a response of 84.05, which is almost 2.7 times as high as that of nanowires (31.54). Moreover, they possess more rapid response/recovery time (11 s and 36 s, respectively) than nanowires (17 s and 40 s, respectively). The lowest detection limit for acetone is 0.1 ppm and its response is 2.15. In addition, both of EFO nanotubes and nanowires sensors have a good linearity (0.1–500 ppm) and favorable selectivity in acetone detection.
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