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RISS 인기검색어
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- 저자 : Guoxu Chen (검색결과 3 건)
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Yan Jiang,Xianming Zhang,Guoxu Chen,Yu Shen,Liang Zhou 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.6
The batch bioreactor with a maximum capacity of 0.28 m3 was designed and manufactured according to oilfield conditions Acinetobacter johnsonii ioslated from waste oil in an aerobic environment was employed to cleanse waste oil and wash-down water using the bioreactor in a pilot scale. The aerating process was optimized from 2 to 4 m3/h corresponding to the different cell growth phases, ensuring sufficient dissolved oxygen and avoiding cell damage from the shearing forces due to strong aeration. The bio-treatment of waste oil underwent two stages:one was the wettability reversal of inorganic admixtures from oil phase into waster phase through enlarged wetting angles, and the other was the bio-flocculation in waster phase by intermediate metabolites excreted by cells. Finally,inorganic admixtures were effectively removed from waste oil and wash-down water at the optimal conditions, with the content less than 0.5% in oil phase and turbidity and sulfide less than 100 NTU and 1 mg/L in the water phase,respectively. Such bio-treatment made the oil-water interface clear against oil and water emulsification and in favor of smooth reclamations for waste oil and wash-down water.
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Huang Jiang,Yi Quanyong,You Yuhong,Chen Yao,Niu Tongtong,Yi Li,Zhang Ji,Ji Xiaoyan,Xu Guoxu,Zou Weijie,Ji Fangfang,Luo Weifeng 대한독성 유전단백체 학회 2021 Molecular & cellular toxicology Vol.17 No.3
Background The retinal vascular endothelial cells can be damaged by oxidative stress even in the early stage of diabetic retinopathy (DR). This study aimed to investigate the protective effect of curcumin on the rat retinal vascular endothelial cells (RRVECs) in high glucose circumstance. Objective The cultured RRVECs were identified and characterized by both of vWF and CD31 immunofluorescence expression. The activation of ROS/NF-κB signal pathway was examined by electrophoretic Mobility Shift Assay (EMSA), immunohistochemistry and Western blot; the apoptosis of RRVECs was tested by flow cytometry. Results We found that curcumin reduced the reactive oxygen species (ROS) and relieved the apoptosis in RRVECs exposed to the high glucose by flow cytometry. It was revealed that the increased activity of NF-κB and phosphorylated NF-κB in RRVECs induced by high glucose concentration was significantly suppressed by curcumin. Conclusion We concluded that curcumin could suppress the oxidative stress via regulation of NF-κB signal to protect the RRVECs in DR. Background The retinal vascular endothelial cells can be damaged by oxidative stress even in the early stage of diabetic retinopathy (DR). This study aimed to investigate the protective effect of curcumin on the rat retinal vascular endothelial cells (RRVECs) in high glucose circumstance. Objective The cultured RRVECs were identified and characterized by both of vWF and CD31 immunofluorescence expression. The activation of ROS/NF-κB signal pathway was examined by electrophoretic Mobility Shift Assay (EMSA), immunohistochemistry and Western blot; the apoptosis of RRVECs was tested by flow cytometry. Results We found that curcumin reduced the reactive oxygen species (ROS) and relieved the apoptosis in RRVECs exposed to the high glucose by flow cytometry. It was revealed that the increased activity of NF-κB and phosphorylated NF-κB in RRVECs induced by high glucose concentration was significantly suppressed by curcumin. Conclusion We concluded that curcumin could suppress the oxidative stress via regulation of NF-κB signal to protect the RRVECs in DR.
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Synthesis of N-doped Carbon Spheres Using Extended Stöber Method for SO2 Adsorption
Yunqian Li,Yifeng Yu,Lei Liu,Hongliang Zhang,Guoxu Wang,Aibing Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1
SO2 is one of the major pollutants in the atmosphere. N-doped microporous carbon spheres (NCS) have been demonstrated to be effective for SO2 adsorption. Here we report the synthesis of monodispersed NCS by the extended Stöber method with urea resorcinol-formaldehyde resins as carbon source, urea as nitrogen source and ammonia as catalyst in an ethanol-water mixed solvent. The obtained carbon spheres show a uniform diameter of around 550 nm, specific surface area of 476 m2 g-1, micropores pore volume of 0.20 cm3 g-1 and nitrogen doping. The NCS manifest special performance for SO2 capture with capability of 75.34 mg g-1 and good cycling stability, due to the large surface area, abundant micropores and nitrogen functionality.
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