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Search Results: 1 - 10 of 127056 matches for " XiWen Li "
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Investigation and Application of High Megavoltage X-Ray Imaging Mode in Radiotherapy  [PDF]
Quanshi Zhang, Xiwen Wang, Qiyin Sun, Yuehui Jin, Yun Li, Ziyu Li, Tao Sun, Liang Wang
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2016, DOI: 10.4236/ijmpcero.2016.51005
Abstract: After drawbacks and shortages of using conventional kV or MV imaging mode were analyzed, this study proposes a new position verification mode with using the energy larger than 15 MeV or nominal accelerating potential greater than 25 MV X-Ray. The new position verification mode is named HMV imaging mode. Along with the comparison of theoretical analyses, phantom experiments and clinical results to the original imaging modes, this report is going to demonstrate the HMV imaging mode is superior to traditional kV and MV imaging modes. This report first theoretically analyzed three main effects of X-ray interacting with medium by numerous equations and compared their mass attenuation coefficient with different types of tissue. X-ray irradiated on a “Catphan 500” cylinder phantom with different energies to verify these theoretical results. Furthermore, based on phantom experiments’ results, we have done numerous clinical trials and comparisons with patient’s clinical results. The theoretical and experimental results illustrate that the scanned images from HMV mode have a good quality and have ability to identify different tissue components clearly. HMV imaging mode overcomes drawbacks of position verification from both kV and MV level imaging mode as well as keeping advantages of kV and MV imaging mode. The result indicates that HMV is a good position verification mode in radiotherapy.
Study of the relationship between sphenoid sinus volume and protrusions in the sphenoid sinus  [PDF]
Yuefeng Li, Jiaqi Sun, Xiwen Zhu, Chenhao Zhao, Jin Xu, Ping Jiang, Xinkang Tong
Forensic Medicine and Anatomy Research (FMAR) , 2014, DOI: 10.4236/fmar.2014.21002
Abstract: The relationship between the volume of sphenoid sinus (SS) and the prevalence of internal carotid artery (ICA) and optic nerve (ON) protrusions in the SS was studied by using high-resolution CT imaging. The ICA and ON protrusions in SS were observed in randomly selected normal head CT scanning images from 350 adult subjects. Ac-cording to the incidence of ICA protrusion, three groups were divided into no ICA protrusion (70.75%), unilateral protrusion (8.68%) and bi-lateral protrusions (20.57%). The ON protrusion accounted for 16% in 350 subjects and accom-panied absolutely with ICA protrusion, but ICA protrusion appeared without accompanying with ON protrusion. The SS volume depended upon the protrusions in it and showed statistical dif-ferences, without ICA protrusion, the smallest size (11.16 ± 1.60) cm3; the unilateral protrusion, medium size (14.20 ± 1.80) cm3 and the bilateral protrusion, the largest size (25.03 ± 2.21) cm3. By observing 3D reconstructed models of ON and SS, we found ON was adjacent to SS (46%) and to posterior ethmoid sinuses (44%). The current study indicates that SS volume is varied with numbers of the protrusions and that ON location varies with the pneumatization of SS. Our results provide an anatomical basis to the surgeries for SS and its surrounding structures.
Molecular Identification of Chinese Materia Medica and Its Adulterants Using ITS2 and psbA-trnH Barcodes: A Case Study on Rhizoma Menispermi  [PDF]
Pei Yang, Xiwen Li, Hong Zhou, Hao Hu, Hui Zhang, Wei Sun, Yitao Wang, Hui Yao
Chinese Medicine (CM) , 2014, DOI: 10.4236/cm.2014.54023
Abstract: Rhizoma Menispermi, derived from the rhizoma of Menispermum dauricum DC., is one of the most popular Chinese medicines. However Rhizoma Menispermi is often illegally mixed with other species in the herbal market, including Aristolochia mollissimae Hance, which is toxic to the kidneys and potentially carcinogenic. The use of DNA barcoding to authenticate herbs has improved the management and safety of traditional medicines. In this paper, 49 samples belonging to five species, including 34 samples of M. dauricum, from different locations and herb markets in China were collected and identified using DNA barcoding. The sequences of all 34 samples of Rhizoma Menispermi are highly consistent, with only one site variation in internal transcribed spacer 2 (ITS2) of nuclear ribosomal DNA and no variations in the psbA-trnH region. The intra-specific genetic distance is much smaller than inter-specific one. Phylogenetic analysis shows that both sequences allow the successful identification of all species. Nearest distance and BLAST1 methods for the ITS2 and psbA-trnH regions indicate 100% identification efficiency. Our research shows that DNA barcoding can effectively distinguish Rhizoma Menispermi from its adulterants from both commercial and original samples, which provides a new and reliable way to monitor commercial herbs and to manage the modern medicine market.
A Molecularly Imprinted Polymer with Incorporated Graphene Oxide for Electrochemical Determination of Quercetin
Si Sun,Mengqi Zhang,Yijun Li,Xiwen He
Sensors , 2013, DOI: 10.3390/s130505493
Abstract: The molecularly imprinted polymer based on polypyrrole film with incorporated graphene oxide was fabricated and used for electrochemical determination of quercetin. The electrochemical behavior of quercetin on the modified electrode was studied in detail using differential pulse voltammetry. The oxidation peak current of quercetin in B-R buffer solution (pH = 3.5) at the modified electrode was regressed with the concentration in the range from 6.0 × 10 ?7 to 1.5 × 10 ?5 mol/L (r 2 = 0.997) with a detection limit of 4.8 × 10 ?8 mol/L (S/N = 3). This electrode showed good stability and reproducibility. In the above mentioned range, rutin or morin which has similar structures and at the same concentration as quercetin did not interfere with the determination of quercetin. The applicability of the method for complex matrix analysis was also evaluated.
Critical phenomena in one dimension from a Bethe ansatz perspective
Xiwen Guan
Physics , 2014, DOI: 10.1142/S0217979214300151
Abstract: This article briefly reviews recent theoretical developments in quantum critical phenomena in one-dimensional (1D) integrable quantum gases of cold atoms. We present a discussion on quantum phase transitions, universal thermodynamics, scaling functions and correlations for a few prototypical exactly solved models, such as the Lieb-Liniger Bose gas, the spin-1 Bose gas with antiferromagnetic spin-spin interaction, the two-component interacting Fermi gas as well as spin-3/2 Fermi gases. We demonstrate that their corresponding Bethe ansatz solutions provide a precise way to understand quantum many-body physics, such as quantum criticality, Luttinger liquids, the Wilson ratio, Tan's Contact, etc. These theoretical developments give rise to a physical perspective using integrability for uncovering experimentally testable phenomena in systems of interacting bosonic and fermonic ultracold atoms confined to 1D.
Generation and analysis of expressed sequence tags from a cDNA library of the fruiting body of Ganoderma lucidum
Hongmei Luo, Chao Sun, Jingyuan Song, Jin Lan, Ying Li, Xiwen Li, Shilin Chen
Chinese Medicine , 2010, DOI: 10.1186/1749-8546-5-9
Abstract: A cDNA library was constructed from the G. lucidum fruiting body. Its high-quality ESTs were assembled into unique sequences with contigs and singletons. The unique sequences were annotated according to sequence similarities to genes or proteins available in public databases. The detection of simple sequence repeats (SSRs) was preformed by online analysis.A total of 1,023 clones were randomly selected from the G. lucidum library and sequenced, yielding 879 high-quality ESTs. These ESTs showed similarities to a diverse range of genes. The sequences encoding squalene epoxidase (SE) and farnesyl-diphosphate synthase (FPS) were identified in this EST collection. Several candidate genes, such as hydrophobin, MOB2, profilin and PHO84 were detected for the first time in G. lucidum. Thirteen (13) potential SSR-motif microsatellite loci were also identified.The present study demonstrates a successful application of EST analysis in the discovery of transcripts involved in the secondary metabolite biosynthesis and the developmental regulation of G. lucidum.Ganoderma lucidum (Curtis: Fr.) P. Karst, Lingzhi in Chinese, which belongs to the Polyporaceae family, has been used in China as medicine for centuries to promote health and longevity [1,2]. In other countries, its fruiting body is used to treat a variety of ailments, such as cancers, hypertension, diabetes, and hepatitis, apart from being a dietary supplement [2-4]. G. lucidum is an anti-tumour agent that acts via immune modulation or stimulating cytokine production [5-7]. The bioactive constituents of G. lucidum include more than 120 different triterpenes and polysaccharides, proteins and other compounds [2,8].Genes involved in the triterpenoids biosynthesis pathways in G. lucidum including squalene synthase (SQS), farnesyl-Diphosphate Synthase (GlFPS) and HMG-CoA reductase (Gl -HMGR) were isolated and characterized [9-11]. Joo et al. identified a laccase gene (GLLac1) from G. lucidum [12]. However, little is known about
Fasting plasma glucose is an independent predictor for severity of H1N1 pneumonia
Wei Wang, Hong Chen, Qiang Li, Bo Qiu, Jiajun Wang, Xiwen Sun, Ying Xiang, Jinchao Zhang
BMC Infectious Diseases , 2011, DOI: 10.1186/1471-2334-11-104
Abstract: We performed a retrospective analysis of patients either diagnosed with or suspected of having H1N1 pneumonia who were admitted to our hospital in 2009. Possible associations between FPG levels and H1N1 virus infection were assessed by logistic regression. Correlation and regression analyses were used to assess relationships between FPG and biochemical test results. Associations between admission days and significant data were assessed by single factor linear regression. To evaluate effects of H1N1 on pancreatic β-cell function, results of a resistance index (homa-IR), insulin function index (homa-β), and insulin sensitivity index (IAI) were compared between a H1N1 group and a non-H1N1 group by t-tests.FPG was significantly positively associated with H1N1 virus infection (OR = 1.377, 95%CI: 1.062-1.786; p = 0.016). FPG was significantly correlated with AST (r = 0.215; p = 0.039), LDH (r = 0.400; p = 0.000), BUN (r = 0.28; p = 0.005), and arterial Oxygen Saturation (SaO2; r = -0.416; p = 0.000) in the H1N1 group. H1N1 patients who were hypoxemic (SaO2<93%) had higher FPG levels than those who were not hypoxic (9.82 ± 4.14 vs. 6.64 ± 1.78; p < 0.05). FPG was negatively correlated with SaO2 in the H1N1 group with hypoxia (SaO2<93; r = -0.497; p = 0.041). SaO2 levels in patients with high FPG levels (≥7 mmol/L) were significantly lower than those of H1N1 patients with low FPG levels (<5.6 mmol/L). There were no significant differences in homa-IR, homa-β, or IAI between the H1N1 and non-H1N1 groups after adjusting for age, sex, and BMI.FPG on admission could be an independent predictor for the severity of H1N1 pneumonia. Elevated FPG induced by H1N1 pneumonia is not a result of direct damage to pancreatic β-cells, but arises from various factors' combinations caused by H1N1 virus infection.The pandemic influenza A (H1N1) virus emerged in the United States and Mexico last year and rapidly spread worldwide [1,2]. Up to December 13, 2009, more than 208 countries and oversea

Sun Xiwen Li Qigeng,

微生物学报 , 1997,
Abstract: The presented paper analysed and studied the conditions of submerged fermentation of quantity of bioconcentration Zn by Flammulina velutipes. The result showed that the ZnAc2 was the better Zn source of submerged fermentation of Flammulina velutipes. Initial pH 6.5, 0.1% citric acid and 0.4% CMC-Na were the better conditions for bioconcentration of Zn and increase the biomass. During the transforming process of organized Zn by Flammulina velutipes, about 93% ZnAc2 was organic-Zn, 50% was protein-Zn, and 34% was Zn binding hydrocarbonate and lipoid material.
Identification of a Role for the PI3K/AKT/mTOR Signaling Pathway in Innate Immune Cells
Songbo Xie, Miao Chen, Bing Yan, Xianfei He, Xiwen Chen, Dengwen Li
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0094496
Abstract: The innate immune system is the first line of host defense against infection and involves several different cell types. Here we investigated the role of the phosphatidylinositol 3 kinase (PI3K) signaling pathway in innate immune cells. By blocking this pathway with pharmacological inhibitors, we found that the production of proinflammatory cytokines was drastically suppressed in monocytes and macrophages. Further study revealed that the suppression was mainly related to the mammalian target of rapamycin (mTOR)/p70S6K signaling. In addition, we found that the PI3K pathway was involved in macrophage motility and neovascularization. Our data provide a rationale that inhibition of the PI3K signaling pathway could be an attractive approach for the management of inflammatory disorders.
Quantum Walks of Two Interacting Particles in One Dimension
Xizhou Qin,Yongguan Ke,Xiwen Guan,Zhibing Li,Natan Andrei,Chaohong Lee
Physics , 2014,
Abstract: We investigate continuous-time quantum walks of two indistinguishable particles (bosons, fermions or hard-core bosons) in one-dimensional lattices with nearest-neighbour interactions. The two interacting particles can undergo independent- and/or co-walking dependent on both quantum statistics and interaction strength. We find that two strongly interacting particles may form a bound state and then co-walk like a single composite particle with statistics-dependent propagation speed. Such an effective single-particle picture of co-walking is analytically derived in the context of degenerate perturbation and the analytical results are well consistent with direct numerical simulation. In addition to implementing universal quantum computation and observing bound states, two-particle quantum walks offer a novel route to detecting quantum statistics. Our theoretical results can be examined in experiments of light propagations in two-dimensional waveguide arrays or spin-impurity dynamics of ultracold atoms in one-dimensional optical lattices.
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