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Enhanced catalyst activity by decorating of Au on Ag@Cu<sub>2</sub>O nanoshell
Chen, Lei,Liu, Maomao,Zhao, Yue,Kou, Qiangwei,Wang, Yaxin,Liu, Yang,Zhang, Yongjun,Yang, Jinghai,Jung, Young Mee Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.435 No.-
<P><B>Abstract</B></P> <P>We successfully synthesized Au-decorated Ag@Cu<SUB>2</SUB>O heterostructures via a simple galvanic replacement method. As the Au precursor concentration increased, the density of the Au nanoparticles (NPs) on the Ag@Cu<SUB>2</SUB>O surface increased, which changed the catalytic activity of the Ag@Cu<SUB>2</SUB>O-Au structure. The combination of Au, Ag, and Cu<SUB>2</SUB>O exhibited excellent catalytic properties, which can further effect on the catalyst activity of the Ag@Cu<SUB>2</SUB>O-Au structure. In addition, the proposed Ag@Cu<SUB>2</SUB>O-Au nanocomposite was used to transform the organic, toxic pollutant, 4-nitrophenol (4-NP), into its nontoxic and medicinally important amino derivative via a catalytic reduction to optimize the material performance. The proposed Au-decorated Ag@Cu<SUB>2</SUB>O exhibited excellent catalytic activity, and the catalytic reduction time greatly decreased (5 min). Thus, three novel properties of Ag@Cu<SUB>2</SUB>O-Au, i.e., charge redistribution and transfer, adsorption, and catalytic reduction of organic pollutants, were ascertained for water remediation. The proposed catalytic properties have potential applications for photocatalysis and localized surface plasmon resonance (LSPR)- and peroxidase-like catalysis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Au-decorated Ag@Cu<SUB>2</SUB>O heterostructures via a simple galvanic replacement method were designed. </LI> <LI> We can easily control the density of the Au NPs on Ag@Cu<SUB>2</SUB>O by changing the concentration of the Au precursor. </LI> <LI> Ag@Cu<SUB>2</SUB>O-Au nanomaterials with high absorption exhibited significantly enhanced catalytic activity for 4-NP. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Qiang Wei,Xiao Xu,Chao Wang,Runzhou Zhuang,Li Zhuang,Lin Zhou,Haiyang Xie,Jian Wu,Min Zhang,Yan Shen,Weilin Wang,Shusen Zheng 거트앤리버 소화기연관학회협의회 2016 Gut and Liver Vol.10 No.4
Background/Aims: We aimed to evaluate the efficacy and safety of an immunosuppressive regimen without steroids after liver transplantation (LT) for hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC). Methods: Sixty-six HCC patients who underwent an immunosuppressive regimen without steroids after LT were enrolled in the steroid-free group. The preoperative characteristics and postoperative outcomes of these patients were compared with those of 132 HCC recipients who were placed on an immunosuppressive regimen using steroids (steroid group). The incidence of acute rejection, HBV recurrence, infection, and new-onset diabetes mellitus and the overall and tumor-free survival rates were compared between the two groups. Results: Differences were not observed in the 1-year (83.3% vs 97.0%, p=0.067), 3-year (65.4% vs 75.8%, p=0.067) or 5-year (56.3% vs 70.7%, p=0.067) patient survival rates or in the 1-year (62.1% vs 72.7%, p=0.067), 3-year (49.8% vs 63.6%, p=0.067) or 5-year (48.6% vs 63.6%, p=0.067) tumor-free survival rates between the two groups, respectively. In the steroid-free group, the patients who fulfilled the Milan criteria had higher overall and tumor-free survival rates than those in the steroid group (p<0.001). The prevalence of HBV recurrence (3.0% vs 13.6%, p=0.02) was significantly lower in the steroid-free group compared with the steroid group. Conclusions: After LT, an immunosuppressive regimen without steroids could be a safe and feasible treatment for HBVrelated HCC patients, thus resulting in the reduction of HBV recurrence. Based on the observed survival rates, patients who fulfill the Milan criteria may derive benefits from steroidfree immunosuppression.
An OpenFlow User-Switch Remapping Approach for DDoS Defense
( Qiang Wei ),( Zehui Wu ),( Kalei Ren ),( Qingxian Wang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.9
DDoS attacks have had a devastating effect on the Internet, which can cause millions of dollars of damage within hours or even minutes. In this paper we propose a practical dynamic defense approach that overcomes the shortage of static defense mechanisms. Our approach employs a group of SDN-based proxy switches to relay data flow between users and servers. By substituting backup proxy switches for attacked ones and reassigning suspect users onto the new proxy switches, innocent users are isolated and saved from malicious attackers through a sequence of remapping process. In order to improve the speed of attacker segregation, we have designed and implemented an efficient greedy algorithm which has been demonstrated to have little influence on legitimate traffic. Simulations, which were then performed with the open source controller Ryu, show that our approach is effective in alleviating DDoS attacks and quarantining the attackers by numerable remapping process. The simulations also demonstrate that our dynamic defense imposes little effect on legitimate users, and the overhead introduced by remapping procedure is acceptable.