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Chemical Constituents from the Aerial Parts of Isodon coetsa and their Cytotoxicity
Wei Zhao,Jian Xin Pu,Xue Du,Yong Zhao,Fei He,Hai Bo Zhang,Yong Bo Xue,Wei Lie Xiao,Han Dong Sun,Ying Li Wu,Guo Qiang Chen 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.12
Three new compounds (1-3), including a neolignan, a triterpenoid, and a diterpenoid, together with twenty known compounds (4-23), were isolated from the aerial parts of Isodon coetsa. Their structures and relative configurations were elucidated on the basis of spectroscopic data. Compounds 1, 3, 5-9, 11-13, 16-17, and 19-23 were evaluated for their cytotoxicity against HT-29, BEL-7402, and SK-OV-3 human tumor cell lines. Compound 7 showed significant inhibitory effects on all three types of cells, with IC50 values of 2.52, 3.06, 2.14 μM, respectively.
Anti-HIV-1 Activity of Lignans from the Fruits of Schisandra rubriflora
Wei-Lie Xiao,Rui-Rui Wang,Wei Zhao,Ren-Rong Tian,Shan-Zhai Shang,Liu-Meng Yang,Jian-Hong Yang,Jian-Xin Pu,Yong-Tang Zheng,Han-Dong Sun 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.5
This study investigated the 70% aqueous acetone extract of the fruits of Schisandra rubriflora which led to the isolation of eight lignans, including a new isolate, rubrisandrin C (1), and seven known lignans (2-8) . The structure of 1 was established by extensive 1D and 2D NMR spectroscopy and its absolute stereochemistry was determined by CD spectrum. Compounds 1-5 and 7-8 were evaluated for their anti-HIV-1 activity that showed inhibitory activity on HIV-1IIIB induced syncytium formation with EC50 values in the range of 2.26~20.4 μg/mL. Compounds 1 and 7 exerted their obvious protection of HIV-1IIIB inducted MT-4 host cells lytic effects with a selectivity index of 15.4 and 24.6, respectively.
Role of water-soluble polymer on foam-injection process for enhancing oil recovery
Peng Wei,Wan-Fen Pu,Lin Sun,Yong Pu,Daibo Li,Ying Chen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
Role of polymer on foam transportation in porous media is still not entirely illustrated. In this study, we performed the foam injection process in cores and the parallel-layered micromodel, respectively. Combined with a series of static investigations, we found that adding polymer to foam could not only effectively generate a viscous force, but also create a protective enclosure around the bubble (i.e., viscoelastic film). This synergistic effect was supposed to increase the foam apparent viscosity, promote the foam strength in the low-quality regime, create the shear-thickening behavior, and restraint the defoaming effect of crude oil. The microflow experiments indicated that polymer-enhanced foam was capable of sharply increasing the sweep efficiency and EOR. Meanwhile, the presence of viscoelastic liquid films contributed to the microflow behaviors.
Pu, Yinfu,Huang, Yanlin,Tsuboi, Taiju,Huang, Wei,Chen, Cuili,Seo, Hyo Jin Elsevier 2015 Materials letters Vol.149 No.-
<P><B>Abstract</B></P> <P>A self-activated yellow-emitting phosphor of nano-sized Cs<SUB>5</SUB>V<SUB>3</SUB>O<SUB>10</SUB> was synthesized by the Pechini method. The crystal phase and structure were investigated by X-ray diffraction (XRD) and structural refinement. The nanoparticles were characterized by scanning electron microscope (SEM) and X-ray photoelectron spectroscopic (XPS) measurements. Luminescence properties such as excitation and emission spectra as well as the absolute external quantum efficiency (<I>η</I>) are presented. Cs<SUB>5</SUB>V<SUB>3</SUB>O<SUB>10</SUB> is efficiently excited by UV light and X-ray and presents a bright yellow luminescence with the maximum <I>η</I> of 85.2%. It is suggested that Cs<SUB>5</SUB>V<SUB>3</SUB>O<SUB>10</SUB> is expected to be an efficient phosphor for lighting and display.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Efficient yellow-emitting Cs<SUB>5</SUB>V<SUB>3</SUB>O<SUB>10</SUB> nanoparticles were developed. </LI> <LI> Cs<SUB>5</SUB>V<SUB>3</SUB>O<SUB>10</SUB> has high quantum efficiency of 85.2% under UV light. </LI> <LI> Cs<SUB>5</SUB>V<SUB>3</SUB>O<SUB>10</SUB> shows scintillating luminescence with 40% intensity of that of Bi<SUB>4</SUB>Ge<SUB>3</SUB>O<SUB>12</SUB>. </LI> <LI> Efficient luminescence of Cs<SUB>5</SUB>V<SUB>3</SUB>O<SUB>10</SUB> is related to structural characteristics. </LI> </UL> </P>
Effects of Fdft 1 gene silencing and VD3 intervention on lung injury in hypoxia-stressed rats
Pu Xiaoyan,Lin Xue,Qi Yinglian,Li Yinglian,Li Tiantian,Liu Yang,Wei Dengbang 한국유전학회 2022 Genes & Genomics Vol.44 No.10
Background: Hypoxia can induce lung injury such as pulmonary arterial hypertension and pulmonary edema. And in the rat model of hypoxia-induced lung injury, the expression of Farnesyl diphosphate farnesyl transferase 1 (Fdft 1) was highly expressed and the steroid biosynthesis pathway was activated. However, the role of Fdft 1 and steroid biosynthesis pathway in hypoxia-induced lung injury remains unclear. Objective: The study aimed to further investigate the relationship between Fdft1 and steroid biosynthesis pathway with hypoxia-induced lung injury. Methods: A rat model of lung injury was constructed by hypobaric chamber with hypoxic stress, the adenovirus interference vector was used to silence the expression of Fdft 1, and the exogenous steroid biosynthesis metabolite Vitamin D3 (VD3) was used to treat acute hypoxia-induced lung injury in rats. Results: Sh-Fdft 1 and exogenous VD3 significantly inhibited the expression of Fdft 1 and the activation of the steroid pathway in hypoxia-induced lung injury rats, which showed a synergistic effect on the steroid activation pathway. In addition, sh-Fdft 1 promoted the increase of pulmonary artery pressure and lung water content, the decrease of oxygen partial pressure and oxygen saturation, and leaded to the increase of lung cell apoptosis and the aggravation of mitochondrial damage in hypoxia-stressed rats. And VD3 could significantly improve the lung injury induced by hypoxia and sh-Fdft 1 in rats. Conclusions: Fdft 1 gene silencing can promote hypoxic-induced lung injury, and exogenous supplement of VD3 has an antagonistic effect on lung injury induced by Fdft 1 gene silencing and hypoxic in rats, suggesting that VD3 has a preventive and protective effect on the occurrence and development of hypoxia-induced lung injury.
Pu Yang,Yu Ding,Ke-Jia Feng,Zi-Wei Shen 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.3
This paper studies the leader-follower consensus tracking for a group of heterogeneous multi-agent systems with nonlinear hybrid order dynamics, external disturbances and actuator faults. First, a novel finite-timeobserver is designed based on a combination of high-order sliding mode and dual layers adaptive rules to realizefast estimation and compensation of disturbances and faults. Then the fixed-time consensus protocols are achievedwith the aid of a novel sliding mode surface. Additionally, the proposed protocols solve the singularity by introducing a continuous sinusoid function. The distributed control protocols are designed for all followers with first-orderor second-order dynamics to achieve synchronization with the leader. Finally, the effectiveness of the algorithm isverified by simulation.
Secrecy Analysis of Amplify-and-Forward Relay Networks with Beamforming
( Pu Chen ),( Jian Ouyang ),( Wei-ping Zhu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10
This paper analyzes the secrecy performance of an amplify-and-forward (AF) relay network, where a multi-antenna eavesdropper attempts to overhear the transmitted message from a multi-antenna source to a multi-antenna destination with a single antenna relay. Firstly, we derive the approximate analytical expressions for the secrecy outage probability (SOP) and average secrecy rate (ASR) of the relay network. Then, asymptotic expressions of SOP and ASR at high main-to-eavesdropper ratio (MER) are also provided to reveal the diversity gain of the secure communication. Finally, numerical results are given to verify the theoretical analysis and show the effect of the number of antennas in the considered relay network.
Pu-xin Zhu,Yu Guan,Ya-hong Mao,Dong Wei,Xiu-xing Wang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
Adsorption thermodynamic and kinetic studies of C. I. disperse dye 60 on PBO fiber pretreated with polyphosphoric acid (PPA) were carried out under the conditions of pH 6.0±0.2, initial dye concentration 0.05-1.0 g/L and liquor ratio 2,000 : 1. The results showed that the equilibrium adsorption isotherm of the disperse dye on the pretreated PBO fiber was a Langmuir-Nernst mixed Model and the saturated adsorption capacity of the turning point was 1.046mg/g. The thermodynamic parameters were calculated by the equilibrium adsorption isotherm, such as standard affinity,enthalpy change and entropy change, which indicated that the adsorption of disperse dye on the pretreated PBO fiber was an exothermic process. Based on the thermodynamic and kinetic data, the adsorption of the dye on the pretreated PBO fiber was a kinetics controlled process, and the disperse dye could only diffuse into the surface layer of pretreated PBO fiber. Meanwhile, the adsorption kinetics of disperse dye on pretreated PBO fiber well agreed with a pseudofirst-order kinetic model.