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Search Results: 1 - 10 of 27585 matches for " Xuelan Hu "
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Research on the Model of Cross-Border Medical Tourism Decision-Making under the Background of Globalization  [PDF]
Xuelan Sun
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.69016
Abstract: With the help of the wave of globalization, the new industry market is constantly emerging, showing a clear trend of “reverse globalization”. Among them, cross-border medical tourism and related industries are particularly effective. The flow of cross-border medical tourism patients has changed dramatically. What is the development of international medical tourism industry? Which factors make the “reverse globalization” phenomenon occur on cross-border medical tourism? How do patients decide their medical tourism destination? This paper based on the analysis of relevant literatures and the development of international medical tourism industry, tries to summarize cross-border medical tourism decision-making process, and develops a two-stage model for cross-border medical tourism. Through the analysis of the decision-making process of cross-border medical tourism, this paper considers that a country’s economic level, political climate and regulatory policies are important factors influencing people’s choice of cross-border medical tourism destinations. We also argue that medical treatment cost, hospital accreditation, quality of care, and physician experience influence patients’ choice of medical facility.
High sensitive and rapid responsive n-type Si: Au sensor for monitoring breath rate  [PDF]
Xuelan Hu, Jiachang Liang, Xing Li, Yue Chen, Chao Zou, Sheng Liu, Xin Chen
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.210130
Abstract: 125 μm-breath sensor with high sensitivity and rapid response was prepared by using n-type Si: Au material. Its sensitivity coefficient and time constant were 4 V.sec / L and 38 msec, respec-tively. Its working principle was based on ano- malous resistance effect, which not only increa- sed the sensitivity, but also reduced its time con-stant greatly. Its signal processing system can select the breath signals and work stably. Therefore, the small changes of breath system can be measured and, especially, patient’s breath rate can be monitored at a distance.
Pollen-mediated gene flow in Chinese commercial fields of glufosinate-resistant canola (Brassica napus)
Li Cai,BiWen Zhou,XueLan Guo,CaiHua Dong,XiaoJia Hu,MingSheng Hou,ShengYi Liu
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0305-6
Abstract: One of the most pressing issues surrounding transgenic oilseed rape cultivation is the potential impact of GM genes entering neighboring non-GM oilseed rape plants, related weeds or closely related wild relatives. Following the principle of a case-by-case for transgenic crop safety assessment, we designed experiments to study pollen-mediated gene flow from herbicide-resistant transgenic oilseed rape to Chinese commercial varieties. The pollen dispersal was detected as the progeny of recipient plants that were identified as glufosinate resistant. The results indicated that pollen dispersal occurred up to 2000 m and its rate sharply decreased as the distance from the pollen source increased. However, the rate of long-distance pollen dispersal from 33 to 2000 m was less than 0.015% and did not present a gradual decrease, indicating the randomization of dispersal and pollination. Most pollen dispersed within a 4.5 m area around the transgenic pollen source plot, with a maximum of 1.19% at the sampling site of 1.4 m. Wind direction significantly affected the direction and the distance of pollen dispersal, resulting in the more and farther dispersal in southwest direction. However, the number of potentially pollinating bees was not correlated with direction and distance from the pollen source plot, suggesting that bee density and distribution would not contribute to the differences in pollen dispersal among different directions. This paper is the first report on research in a large-scale experiment of pollen-mediated gene flow under the China’s environmental conditions and provided scientific evidence for the effective commercialization of transgenic oilseed rape and its safe management. Our results also provided important data on pollen spatial distribution pattern.
Analysis of the arginine biosynthetic gene cluster argCJBDFR of Corynebacterium crenatum  [PDF]
Haitao Jiao, Yong Yuan, Yonghua Xiong, Xuelan Chen
Journal of Biomedical Science and Engineering (JBiSE) , 2011, DOI: 10.4236/jbise.2011.41009
Abstract: Objective: Corynebacterium crenatum AS1.542, a Gram-positive bacterium and indigenous nonpatho-genic corynebacteria, is widely exploited for the in-dustrial production of amino acids. The objective of this paper is to clarify the genetic information of the arginine biosynthetic pathway, and further more contribute to the improvement of arginine produc-tion. Methods: Polymerase chain reaction (PCR) technology was employed for obtaining the arginine biosynthetic gene sequence, and softwares eg. Laser-gene, BPROM, RNAshapes were used for the analysis of obtained sequences. Results: Arginine biosynethetic gene cluster of C. crenatum, comprising argJ, argB, argD, argF, argR and part of argC, has been ampli-fied and sequenced. The gene order has been estab-lished as argCJBDFR, with a entire length of 6.08kb. Conclusion: An internal promoter was found in the upstream of argB gene, four argBDFR ORFs are lo-cated in a same transcription unit, and the tran-scripiton termination of argC gene is irrelevant with the rho-factor. Comparison with ornithine acetyl-transferase (coded by argJ gene) from C. glutamate, ornithine acetyltransferase from C. crenatum also belongs to the monofunctional enzymes.
A New Interleaver Design for Iteratively Decoded Bit-Interleaved Coded Modulation
Xuelan Zou,Minhong Wang,Guangzeng Feng
International Journal of Soft Computing , 2012,
Abstract: Bit-interleaved coded modulation with iterative decoding (BICM-ID) is a bandwidth efficient transmission scheme, which is a low complexity alternative to turbo code. The high performance of BICM-ID depends on the interleaver design. A new interleaver based on the chaos theory and golden section is proposed in the study, which outperforms the random interleaver usually used in a BICM-ID system. In comparison to the golden interleaver, the new interleaver has a low correlation and exhibits a significant performance improvement with an acceptable complexity addition. Simulation results in Both Additive White Gaussian Noise (AWGN) channel and Rayleigh fading channel demonstrate the effectiveness of the proposed approach.
Sulfotanshinone Sodium Injection for Unstable Angina Pectoris: A Systematic Review of Randomized Controlled Trials
Xuelan Qiu,Andrew Miles,Xuehua Jiang,Xin Sun,Nan Yang
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/715790
Abstract: Objective. To assess the effect of sulfotanshinone sodium injection for unstable angina. Methods. We searched for published and unpublished studies up to June 2011. We included randomized controlled trials that confoundedly addressed the effect of sulfotanshinone sodium injection in the treatment of unstable angina. Results. Twenty-five studies involving 2,377 people were included. There was no evidence that sulfotanshinone sodium alone had better or worse effects to routine western medicine treatments in improving clinical symptoms (RR 1.00, 95% CI 0.90 to 1.11) and ECG (RR 0.97, 95% CI 0.87 to 1.09). However, there was evidence that sulfotanshinone sodium combined with western medications was a better treatment option than western medications alone in improving clinical symptoms (RR 1.28, 95% CI 1.23 to 1.3), ECG (RR 1.26, 95% CI 1.18 to 1.35), C-reaction protein (mean difference 2.10, 95% CI 1.63 to 2.58), and IL-6 (mean difference −3.85, 95% CI −4.10 to −3.60). There was no difference between sulfotanshinone sodium plus western medications and western medications alone affecting mortality (RR 0.50, 95% CI 0.02 to 12.13). Conclusion. Compared with western medications alone, sulfotanshinone sodium combined with western medications may provide more benefits for patients with unstable angina. Further large-scale high-quality trials are warranted.
Effect of the population heterogeneity on growth behavior and its estimation
HuaiQiang Zhang,LiLi Lu,XueLan Yan,PeiJi Gao
Science China Life Sciences , 2007, DOI: 10.1007/s11427-007-0057-6
Abstract: Different types of the Logistic model are constructed based on a simple assumption that the microbial populations are all composed of homogeneous members and consequently, the condition of design for the initial value of these models has to be rather limited in the case of N(t 0)=N 0. Therefore, these models cannot distinguish the dynamic behavior of the populations possessing the same N 0 from heterogeneous phases. In fact, only a certain ratio of the cells in a population is dividing at any moment during growth progress, termed as θ, and thus, dN / dt not only depends on N, but also on θ. So θ is a necessary element for the condition design of the initial value. Unfortunately, this idea has long been neglected in widely used growth models. However, combining together the two factors (N 0 and θ) into the initial value often leads to the complexity in the mathematical solution. This difficulty can be overcome by using instantaneous rates (V inst) to express growth progress. Previous studies in our laboratory suggested that the V inst curve of the bacterial populations all showed a Guassian function shape and thus, the different growth phases can be reasonably distinguished. In the present study, the Gaussian distribution function was transformed approximately into an analytical form ( $Y_i = \alpha e^{\left[ { - 0.5\left( {\frac{{x_i - x_0 }}{b}} \right)^2 } \right]} $ ) that can be conveniently used to evaluate the growth parameters and in this way the intrinsic growth behavior of a bacterial species growing in heterogeneous phases can be estimated. In addition, a new method has been proposed, in this case, the lag period and the double time for a bacterial population can also be reasonably evaluated. This approach proposed could thus be expected to reveal important insight of bacterial population growth. Some aspects in modeling population growth are also discussed.
The Clinical Characteristics and Direct Medical Cost of Influenza in Hospitalized Children: A Five-Year Retrospective Study in Suzhou, China
Tao Zhang, Qiuli Zhu, Xuelan Zhang, Yunfang Ding, Mark Steinhoff, Steven Black, Genming Zhao
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0044391
Abstract: Background There have been few studies on children hospitalized with influenza published from mainland China. We performed a retrospective review of medical charts to describe the epidemiology, clinical features and direct medical cost of laboratory-proven influenza hospitalized children in Suzhou, China. Methods Retrospective study on children with documented influenza infection hospitalized at Suzhou Children Hospital during 2005–2009 was conducted using a structured chart review instrument. Results A total of 480 children were positive by immuno-fluorescent assay for influenza during 2005–2009. The hospitalizations for influenza occurred in 8–12 months of the year, most commonly in the winter with a second late summer peak (August-September). Influenza A accounted for 86.3%, and of these 286 (59.6%) were male, and 87.2% were <5 years of age. The median length of hospital stay was 7 days. Fever was the most common symptom, occurring in 398 (82.9%) children. There were 394 (82.1%) children with pneumonia and 70.2% of these hospitalized children had radiographic evidence of a pulmonary infiltrate. One hundred and twelve children (23.3%) required oxygen treatments and 13 (2.7%) were transferred to the ICU. Multivariable logistic regression showed that compared with the ≤6 months children, those aged >60 months old had shorter hospital stay (OR = 0.45); children with oxygen treatment tended to have longer hospital stays than those without oxygen treatment (OR = 2.14). The mean cost of each influenza-related hospitalization was US$ 624 (US$ 1323 for children referred to ICU and US$ 617 for those cared for on the wards). High risk children had higher total cost than low-risk patients. Conclusion Compared to other countries, in Suzhou, children hospitalized with influenza have longer hospital stay and higher percentage of pneumonia. The direct medical cost is high relative to family income. Effective strategies of influenza immunization of young children in China may be beneficial in addressing this disease burden.
Discrimination of the rare medicinal plant Dendrobium officinale based on naringenin, bibenzyl, and polysaccharides
XiaoMei Chen,FangFei Wang,YunQiang Wang,XueLan Li,AiRong Wang,ChunLan Wang,ShunXing Guo
Science China Life Sciences , 2012, DOI: 10.1007/s11427-012-4419-3
Abstract: The aim of this study was to establish a method for discriminating Dendrobium officinale from four of its close relatives Dendrobium chrysanthum, Dendrobium crystallinum, Dendrobium aphyllum and Dendrobium devonianum based on chemical composition analysis. We analyzed 62 samples of 24 Dendrobium species. High performance liquid chromatography analysis confirmed that the four low molecular weight compounds 4′,5,7-trihydroxyflavanone (naringenin), 3,4-dihydroxy-4′,5-dime-thoxybibenzyl (DDB-2), 3′,4-dihydroxy-3,5′-dimethoxybibenzyl (gigantol), and 4,4′-dihydroxy-3,3′,5-trimethoxybibenzy (moscatilin), were common in the genus. The phenol-sulfuric acid method was used to quantify polysaccharides, and the monosaccharide composition of the polysaccharides was determined by gas chromatography. Stepwise discriminant analysis was used to differentiate among the five closely related species based on the chemical composition analysis. This proved to be a simple and accurate approach for discriminating among these species. The results also showed that the polysaccharide content, the amounts of the four low molecular weight compounds, and the mannose to glucose ratio, were important factors for species discriminant. Therefore, we propose that a chemical analysis based on quantification of naringenin, bibenzyl, and polysaccharides is effective for identifying D. officinale.
Population genetic structure of tapertail anchovy (Coilia mystus) in coastal waters of southeast China based on mtDNA control region sequences
基于线粒体控制区的序列变异分析中国东南部沿海凤鲚种群遗传结构

Xuelan Yan,Wenqiao Tang,Jinquan Yang,
阎雪岚
,唐文乔,杨金权

生物多样性 , 2009,
Abstract: 为了解中国东南部沿海凤鲚(Coilia mystus)的种群遗传多样性和遗传结构, 本文分析了长江口(CJ)、钱塘江口(QT)、闽江口(MJ)和九龙江口(JL)4个凤鲚地理群体的mtDNA控制区561 bp片段的序列变异。65尾样本共检测到28个单元型。4个群体总的单元型多样性和核苷酸多样性均较高(h = 0.9433 ± 0.0168, π = 0.0317 ± 0.0158), 但单个群体的核苷酸多样性水平却很低, 其中以CJ最高(π = 0.0080 ± 0.0046), MJ最低(π = 0.0015 ± 0.0013)。MJ与JL群体之间以及CJ与QT群体之间的平均K2P遗传距离很小, 分别为0.3%和0.8%; 而CJ、QT分别与MJ、JL群体之间的遗传距离均较大, 达到了6%。采用最大似然法(ML)、最大简约法(MP)和邻接法(NJ)分别构建的单元型间的系统发育树揭示, 4个凤鲚群体构成CJ-QT 和MJ-JL 2个支系, 且具有极高的支持率。单元型的网络分析也显示这两个支系间有高达28步的突变次数。AMOVA分析显示大部分的遗传变异来自这两支系群体间(90.77%), 表明凤鲚群体间存在着显著的地理分化。种群分化指数和基因流分析也表明, 支系间群体有着明显的遗传分化(FST > 0.9, Nm < 0.03)。所有分析结果支持所研究的凤鲚标本属于两个不同的地理种群, 且种群的分化至少已达到亚种水平。采用BEAST和TRACER软件得到凤鲚两个亚种的最近共同祖先约在0.34–0.46百万年前, 处于更新世晚期, 推测可能是第四纪晚期的气候旋回和海平面的升降导致了凤鲚的种群分化。
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