oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 170 )

2018 ( 1513 )

2017 ( 1527 )

2016 ( 1383 )

Custom range...

Search Results: 1 - 10 of 93805 matches for " Xiao Nan Yang "
All listed articles are free for downloading (OA Articles)
Page 1 /93805
Display every page Item
Chemical composition, antioxidant and antibacterial activities of essential oil from Korean Citrus unshiu peel  [PDF]
Xiao Nan Yang, Sun Chul Kang
Journal of Agricultural Chemistry and Environment (JACEN) , 2013, DOI: 10.4236/jacen.2013.23007
Abstract: The chemical composition, antioxidant and antibacterial activities of essential oil from peel of Citrus unshiuwhich cultivated in South Korea were investigated. Eight compounds were identified as l-limonene (88.11%), γ-terpinene (4.66%), cyclohexane, 2,4-diisopropenyl-1-methyl-1-vinyl (1.82%), diethyl phthalate (1.02%), β-linalool (0.97%), β-myrcene (0.91%), α-farnesene (0.91%) and o-cymene (0.85%)
by GC-MS. The SC50values of this essential oil on DPPH and superoxide anion were 0.21 and 0.22% (v/v), respectively. The results of zone of inhibition, MIC, MBC and cell viability demonstrated the essential oil of-Citrus unshiupeel displayed antibacterial effect against B. cereus KCTC 14042, B. subtilis ATCC 6633 and S. aureusATCC 6538. The release of cell material and potassium ion from the B. subtilis ATCC 6633 cells treated with essential oil was further investigated. SEM observation also revealed the damaging effect of the essential oil on the morphology of B. subtilisATCC 6633 cells at minimum inhibitory concentration.


Non-preventive use of antibiotics in patients with severe acute pancreatitis treated with integrated traditional Chinese and Western medicine therapy: a randomized controlled trial
Xiao-nan YANG,Qing XIA
Zhong Xi Yi Jie He Xue Bao , 2009,
Abstract: Objective: To investigate the prognostic effects of integrated traditional Chinese and Western medicine therapy without antibiotics in treatment of patients with severe acute pancreatitis (SAP).Methods: SAP patients were randomly divided into treatment group (26 cases included) and control group (28 cases included). In addition to the same protocol of integrated traditional Chinese and Western medicine treatment for both groups, intravenous drip infusion of 0.5 g imipenem-cilastatin was administered to the patients in the control group every eight hours for ten days. The 48-hour Ranson score, 24-hour acute physiology and chronic heath evaluation Ⅱ score, and incidence rates of complications were observed. The concentrations of serum C-reactive protein (CRP) on days 1, 3, 7 and 10 were measured, and strains of infection were detected with smear and culture examination for bacteria and fungi.Results: There were no statistical differences in demographic information, baseline data and incidence rates of complications between the two groups (P>0.05), but fungal infection rate in the control group was higher than that in the treatment group (P<0.05). There were no statistical differences in infection rates of G- and G+ germs between the two groups; blood and some organs including lung, pancreas, intestine, and urethra were infected with bacteria and fungi. There were also no significant differences in the serum CRP concentrations on days 1, 3, 7 and 10 between the two groups (P>0.05), but the serum CRP concentrations on days 1, 3, 7 and 10 in infected patients were higher than those in non-infected patients (P<0.05, P<0.01).Conclusion: The study cannot confirm that the incidence rates of secondary infection and mortality in SAP patients treated with integrated traditional Chinese and Western medicine are reduced by prophylaxis with imipenem-cilastatin.
Porosity Calculation of Tight Sand Gas Reservoirs with GA-CM Hybrid Optimization Log Interpretation Method  [PDF]
Ya-Nan Duan, Bao-Zhi Pan, Xue Han, Hai-Tao Zhang, Xiao-Ming Yang
Journal of Geoscience and Environment Protection (GEP) , 2014, DOI: 10.4236/gep.2014.23013
Abstract:

Tight sand gas reservoirs are our country’s fairly rich unconventional natural gas resources, and their exploration and development is of prime importance. Sulige Gas Field which located in the northern Ordos Basin is tight sand gas reservoirs. It is typically featured by low porosity and low permeability, and the error of porosity calculation by traditional methods is larger. Multicomponent explanation model is built by analyzing the thin slice data, and the objective function is got according to the concept of optimization log interpretation method. This paper puts the Genetic Algorithm and the Complex Algorithm together to form the GA-CM Hybrid Algorithm for searching the optimal solution of the objective function, getting the porosity of tight sandstone gas reservoirs. The deviation got by this method is lesser compared with the core porosity, with a high reliability.

EDCA Model of TCP/UDP Flows Based on Non-saturation
非饱和状态下TCP/UDP混合流的EDCA模型分析

ZHANG Nan,XIAO Yang,
张南
,肖扬

计算机科学 , 2011,
Abstract: IEEE 802. 11e EDCA mechanism permits using CFB (Contention Free Burst) , which will control the media in a whole TXOP. So it can save some time to occupy the channel and improve the QoS. But few papers think over TXOP in non-saturation. This paper proposed an easy analysis model of TC;P/UDP heterogeneous flows appear in non-saturated condition based on IEEE 802. lle EDCA mechanism the model thinks over CFB, the simulation results indicate that the model is valid on forecasting the EI}CA mechanism of mixed flows, and the interaction of the mixed TCP/UDP flows appear when they share the same channel.
Present and future of prophylactic antibiotics for severe acute pancreatitis
Kun Jiang,Wei Huang,Xiao-Nan Yang,Qing Xia
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i3.279
Abstract: AIM: To investigate the role of prophylactic antibiotics in the reduction of mortality of severe acute pancreatitis (SAP) patients, which is highly questioned by more and more randomized controlled trials (RCTs) and meta-analyses. METHODS: An updated meta-analysis was performed. RCTs comparing prophylactic antibiotics for SAP with control or placebo were included for meta-analysis. The mortality outcomes were pooled for estimation, and re-pooled estimation was performed by the sensitivity analysis of an ideal large-scale RCT. RESULTS: Currently available 11 RCTs were included. Subgroup analysis showed that there was significant reduction of mortality rate in the period before 2000, while no significant reduction in the period from 2000 [Risk Ratio, (RR) = 1.01, P = 0.98]. Funnel plot indicated that there might be apparent publication bias in the period before 2000. Sensitivity analysis showed that the RR of mortality rate ranged from 0.77 to 1.00 with a relatively narrow confidence interval (P < 0.05). However, the number needed to treat having a minor lower limit of the range (7-5096 patients) implied that certain SAP patients could still potentially prevent death by antibiotic prophylaxis. CONCLUSION: Current evidences do not support prophylactic antibiotics as a routine treatment for SAP, but the potentially benefited sub-population requires further investigations.
Dirac dynamical resonance states around Schwarzschild black holes
Xiang-Nan Zhou,Xiao-Long Du,Ke Yang,Yu-Xiao Liu
Physics , 2013, DOI: 10.1103/PhysRevD.89.043006
Abstract: Recently, a novel kind of scalar wigs around Schwarzschild black holes---scalar dynamical resonance states were introduced in [Phys. Rev. D 84, 083008 (2011)] and [Phys. Rev. Lett. 109, 081102 (2012)]. In this paper, we investigate the existence and evolution of Dirac dynamical resonance states. First we look for stationary resonance states of a Dirac field around a Schwarzchild black hole by using the Schr\"{o}dinger-like equations reduced from the Dirac equation in Schwarzschild spacetime. Then Dirac pseudo-stationary configurations are constructed from the stationary resonance states. We use these configurations as initial data and investigate their numerical evolutions and energy decay. These dynamical solutions are the so-called "Dirac dynamical resonance states". It is found that the energy of the Dirac dynamical resonance states shows an exponential decay. The decay rate of energy is affected by the resonant frequency, the mass of Dirac field, the total angular momentum, and the spin-orbit interaction. In particular, for ultra-light Dirac field, the corresponding particles can stay around a Schwarzschild black hole for a very long time, even for cosmological time-scales.
A Series Solution to the Luminosity Distance in a Flat LCDM Universe
De-Zi Liu,Nan-Nan Yue,Xiao-Lei Meng,Tong-Jie Zhang,Zhi-Liang Yang
Physics , 2010,
Abstract: Cosmological observations indicate that our universe is flat and dark energy (DE) dominated at present. The luminosity distance plays an important role in the investigation of the evolution and structure of the universe. Nevertheless, the evaluation of the luminosity distance d_L is associated computationally heavy numerical quadratures in practice. In this Letter we find a series solution of the luminosity distance in a spatially flat LCDM cosmological model. And it is further shown that the series solution has a relative error of less than 0.36% for any relative parameter \beta (\beta = Omega_m / Omega_L) from zero to four, i.e. 0.2 < Omega_L < 1 and redshift z > 0.1 when the order of the series is n = 100.
Modified frequency computation method for optimal environmental flows
Dong Zhen-Hui,Yang Xiao-Hua,Guo Ya-Nan,Mei Ying
Thermal Science , 2012, DOI: 10.2298/tsci1205539d
Abstract: The paper describes a modified frequency computation method to calculate the optimal environmental flows. This method was used to design monthly environmental flows in Lancang river. The environmental flows calculated by the method are compared with those by the ecological flow method and the Tennant method, revealing its effectiveness.
Thermodynamic and kinetics studies of the adsorption of phosphorus by bioretention media
Mei Ying,Yang Xiao-Hua,Guo Ya-Nan,He Jun
Thermal Science , 2012, DOI: 10.2298/tsci1205506m
Abstract: The objective of this study is to explore the mechanism of phosphorus adsorption in the bioretention media. The phosphorus adsorption characteristics of four media of bioretention are studied by four isothermal adsorption experiments. The result indicate that the maximal adsorption capacity (qm) of phosphorus of the four bioretention media are found to be media I (0.3365 mg/g), media II (0.3302 mg/g), media III (0.2751 mg/g) and media IV 0.8435 mg/g), respectively. The negative values of Gibbs free energy of phosphorus indicate that each of the phosphorus adsorption process by the four bioretention media is a spontaneous process. The mean sorption energies obtained from DR isotherm were 0.0758, 0.0772, 0.0803 and 0.0632 kJ/mol respectively, which indicate the physical nature of the adsorbate/adsorbent interactions. Two kinetic models including pseudo first-order and pseudo second-order equation were selected to follow the adsorption process. The results showed that the adsorption of phosphorus with the four types of bioretention media could be described by the pseudo second-order equation. The media IV was the better media of bioretention with high phosphorus removal capacity.
Zinc finger protein A20 protects rats against chronic liver allograft dysfunction
Jie Yang,Ming-Qing Xu,Lu-Nan Yan,Xiao-Bo Chen
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i27.3537
Abstract: AIM: To investigate the effect of zinc finger protein A20 on chronic liver allograft dysfunction in rats. METHODS: Allogeneic liver transplantation from DA rats to Lewis rats was performed. Chronic liver allograft dysfunction was induced in the rats by administering low-dose tacrolimus at postoperative day (POD) 5. Hepatic overexpression of A20 was achieved by recombinant adenovirus (rAd.)-mediated gene transfer administered intravenously every 10 d starting from POD 10. The recipient rats were injected with physiological saline, rAdEasy-A20 (1 × 109 pfu/30 g weight) or rAdEasy (1 × 109 pfu/30 g weight) every 10 d through the tail vein for 3 mo starting from POD 10. Liver tissue samples were harvested on POD 30 and POD 60. RESULTS: Liver-transplanted rats treated with only tacrolimus showed chronic allograft dysfunction with severe hepatic fibrosis. A20 overexpression ameliorated the effects on liver function, attenuated liver allograft fibrosis and prolonged the survival of the recipient rats. Treatment with A20 suppressed hepatic protein production of tumor growth factor (TGF)-β1, interleukin-1β, caspase-8, CD40, CD40L, intercellular adhesion molecule-1, vascular cell adhesion molecule-1 and E-selectin. A20 treatment suppressed liver cell apoptosis and inhibited nuclear factor-κB activation of Kupffer cells (KCs), liver sinusoidal endothelial cells (LSECs) and hepatic stellate cells (HSCs), and it subsequently decreased cytokine mRNA expression in KCs and LSECs and reduced the production of TGF-β1 in HSCs. CONCLUSION: A20 might prevent chronic liver allograft dysfunction by re-establishing functional homeostasis of KCs, LSECs and HSCs.
Page 1 /93805
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.