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Search Results: 1 - 10 of 13606 matches for " Shu Ouyang "
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Permian palynofloras from Yongchang and Sunan of Gansu Province and their phytoprovincial characteristics
Shu Ouyang,Huaicheng Zhu,Hui Wang
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885030
Abstract: The Early Permian (Shansi + Lower Shihhotse Formations) palynofloras of Longshoushan are dominated by Cathaysian-Euramerican common forms, mainly composed of pteridophytic and pteridospermous spores. But up to the Lower Shihhotse Formation, gymnosperms greatly developed, and they possibly already dominated the vegetation in the Upper Shihhotse Formation; while in the late Late Permian, they indicate a strong colour of Subangara area. In other words, during the whole Permian, the Cathaysian flora had a history from prosperity to decline, and Subangara plants might have had a reverse tendency there.
Permian palynofloras from Yongchang and Sunan of Gansu Province and their phytoprovincial characteristics

Shu Ouyang,Huaicheng Zhu,Hui Wang,

科学通报(英文版) , 1999,
Abstract: The Early Permian (Shansi + Lower Shihhotse Formations) palynofloras of Longshoushan are dominated by Cathaysian-Euramerican common forms, mainly composed of pteridophytic and pteridospermous spores. But up to the Lower Shihhotse Formation, gymnosperms greatly developed, and they possibly already dominated the vegetation in the Upper Shihhotse Formation; while in the late Late Permian, they indicate a strong colour of Subangara area. In other words, during the whole Permian, the Cathaysian flora had a history from prosperity to decline, and Subangara plants might have had a reverse tendency there.
Identification and characterization of pseudogenes in the rice gene complement
Fran?oise Thibaud-Nissen, Shu Ouyang, C Robin Buell
BMC Genomics , 2009, DOI: 10.1186/1471-2164-10-317
Abstract: A total of 1,439 pseudogenes, identified among genes with pseudogene features, were characterized by similarity to fully-supported gene models and the presence of frameshifts or premature translational stop codons. Significant difference in the length of duplicated genes within segmentally-duplicated regions was the optimal indicator of pseudogenization. Among the 816 pseudogenes for which a probable origin could be determined, 75% originated from gene duplication events while 25% were the result of retrotransposition events. A total of 12% of the pseudogenes were expressed. Finally, F-box proteins, BTB/POZ proteins, terpene synthases, chalcone synthases and cytochrome P450 protein families were found to harbor large numbers of pseudogenes.These pseudogenes still have a detectable open reading frame and are thus distinct from pseudogenes detected within intergenic regions which typically lack definable open reading frames. Families containing the highest number of pseudogenes are fast-evolving families involved in ubiquitination and secondary metabolism.Pseudogenes are defined as genes that have lost their ability to produce a functional protein. Although such relics have been identified in all genomes, the number and persistence of pseudogenes varies greatly among species: in human, the estimated number of pseudogenes ranges from 10,000 to 20,000 [1,2], while in Drosophila, only 110 pseudogenes (or 1 pseudogene per 130 genes) were identified [3]. Pseudogenes are hypothesized to arise by gene duplication, including retrotransposition during which a retrotransposase mediates the integration a transcript into the genome [4] (see Additional file 1). Since they are redundant with the genes from which the transcript originated (hereafter termed parent gene) and are integrated without a promoter into random locations in the genome, the products of retrotransposition events are likely to be nonfunctional and to accumulate disabling mutations faster than functional genes. I
Gut-liver axis plays a role in hepatocarcinogenesis of patients with Crohn’s disease
Shu-Mei Zheng,De-Jun Cui,Qin Ouyang
World Journal of Gastroenterology , 2011, DOI: 10.3748/wjg.v17.i26.3171
Abstract: The development of hepatocellular carcinoma (HCC) is attributed to several factors, including chronic viral infection, alcohol consumption, exposure to aflatoxin B1 and metabolic disorders. Several recent reports have shown that HCC can occur in patients with long-standing Crohn’s disease (CD) in the absence of other underlying high-risk liver diseases. There may be an association between CD and hepatocarcinogenesis, however, the precise mechanism for this requires further investigations.
An Improved Catastrophic Genetic Algorithm and Its Application in Reactive Power Optimization  [PDF]
Ouyang Sen
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.24043
Abstract: This paper presents an Improved Catastrophic Genetic Algorithm (ICGA) for optimal reactive power optimization. Firstly, a new catastrophic operator to enhance the genetic algorithms’ convergence stability is proposed. Then, a new probability algorithm of crossover depending on the number of generations, and a new probability algorithm of mutation depending on the fitness value are designed to solving the main conflict of the convergent speed with the global astringency. In these ways, the ICGA can prevent premature convergence and instability of genetic-catastrophic algorithms (GCA). Finally, the ICGA is applied for power system reactive power optimization and evaluated on the IEEE 14-bus power system, and the application results show that the proposed method is suitable for reactive power optimization in power system.
Import Competition and Export Dual Margins of Multi-Product Firms  [PDF]
Jianhuan Ouyang
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.44013
Abstract: Using the matching panel data of Chinese industrial database and Custom database in the period of 2000-2006, this paper studies the relationship between import competition and dual exporting margins of multiproduct firm. This study finds that: import competition improves the intensive and extensive margins significantly, even stronger to the intensive margin.
The Spatiotemporal Pattern of Src Activation at Lipid Rafts Revealed by Diffusion-Corrected FRET Imaging
Shaoying Lu,Mingxing Ouyang,Jihye Seong,Jin Zhang,Shu Chien,Yingxiao Wang
PLOS Computational Biology , 2008, DOI: 10.1371/journal.pcbi.1000127
Abstract: Genetically encoded biosensors based on fluorescence resonance energy transfer (FRET) have been widely applied to visualize the molecular activity in live cells with high spatiotemporal resolution. However, the rapid diffusion of biosensor proteins hinders a precise reconstruction of the actual molecular activation map. Based on fluorescence recovery after photobleaching (FRAP) experiments, we have developed a finite element (FE) method to analyze, simulate, and subtract the diffusion effect of mobile biosensors. This method has been applied to analyze the mobility of Src FRET biosensors engineered to reside at different subcompartments in live cells. The results indicate that the Src biosensor located in the cytoplasm moves 4–8 folds faster (0.93±0.06 μm2/sec) than those anchored on different compartments in plasma membrane (at lipid raft: 0.11±0.01 μm2/sec and outside: 0.18±0.02 μm2/sec). The mobility of biosensor at lipid rafts is slower than that outside of lipid rafts and is dominated by two-dimensional diffusion. When this diffusion effect was subtracted from the FRET ratio images, high Src activity at lipid rafts was observed at clustered regions proximal to the cell periphery, which remained relatively stationary upon epidermal growth factor (EGF) stimulation. This result suggests that EGF induced a Src activation at lipid rafts with well-coordinated spatiotemporal patterns. Our FE-based method also provides an integrated platform of image analysis for studying molecular mobility and reconstructing the spatiotemporal activation maps of signaling molecules in live cells.
Analysis of 90 Mb of the potato genome reveals conservation of gene structures and order with tomato but divergence in repetitive sequence composition
Wei Zhu, Shu Ouyang, Marina Iovene, Kimberly O'Brien, Hue Vuong, Jiming Jiang, C Robin Buell
BMC Genomics , 2008, DOI: 10.1186/1471-2164-9-286
Abstract: In this study, we report on analysis 89.9 Mb of potato genomic sequence representing 10.2% of the genome generated through end sequencing of a potato bacterial artificial chromosome (BAC) clone library (87 Mb) and sequencing of 22 potato BAC clones (2.9 Mb). The GC content of potato is very similar to Solanum lycopersicon (tomato) and other dicotyledonous species yet distinct from the monocotyledonous grass species, Oryza sativa. Parallel analyses of repetitive sequences in potato and tomato revealed substantial differences in their abundance, 34.2% in potato versus 46.3% in tomato, which is consistent with the increased genome size per haploid genome of these two Solanum species. Specific classes and types of repetitive sequences were also differentially represented between these two species including a telomeric-related repetitive sequence, ribosomal DNA, and a number of unclassified repetitive sequences. Comparative analyses between tomato and potato at the gene level revealed a high level of conservation of gene content, genic feature, and gene order although discordances in synteny were observed.Genomic level analyses of potato and tomato confirm that gene sequence and gene order are conserved between these solanaceous species and that this conservation can be leveraged in genomic applications including cross-species annotation and genome sequencing initiatives. While tomato and potato share genic features, they differ in their repetitive sequence content and composition suggesting that repetitive sequences may have a more significant role in shaping speciation than previously reported.The potato (Solanum tuberosum) tuber is a specialized underground storage organ that develops from modified stems termed stolons. Although the tuber is primarily composed of starch, it also contains high levels of proteins and due to its importance as a food source, a prime focus in potato research has been tuber quality [1-6]. Another key focus in potato research is disease resi
Comparative analyses of six solanaceous transcriptomes reveal a high degree of sequence conservation and species-specific transcripts
Willem Rensink, Yuandan Lee, Jia Liu, Stacy Iobst, Shu Ouyang, C Robin Buell
BMC Genomics , 2005, DOI: 10.1186/1471-2164-6-124
Abstract: All available ESTs and Expressed Transcripts (ETs), 449,224 sequences for six Solanaceae species (potato, tomato, pepper, petunia, tobacco and Nicotiana benthamiana), were clustered and assembled into gene indices. Examination of gene ontologies revealed that the transcripts within the gene indices encode a similar suite of biological processes. Although the ESTs and ETs were derived from a variety of tissues, 55–81% of the sequences had significant similarity at the nucleotide level with sequences among the six species. Putative orthologs could be identified for 28–58% of the sequences. This high degree of sequence conservation was supported by expression profiling using heterologous hybridizations to potato cDNA arrays that showed similar expression patterns in mature leaves for all six solanaceous species. 16–19% of the transcripts within the six Solanaceae gene indices did not have matches among Solanaceae, Arabidopsis, rice or 21 other plant gene indices.Results from this genome scale analysis confirmed a high level of sequence conservation at the nucleotide level of the coding sequence among Solanaceae. Additionally, the results indicated that part of the Solanaceae transcriptome is likely to be unique for each species.The Solanaceae family encompasses a number of species of agronomic and ornamental importance. With regards to cultivation for food consumption, in 2003, potato was the world's fifth largest crop in world-wide production acreage and the solanaceous vegetables tomato, eggplant, and pepper ranked 11th, 19th, and 22nd, respectively [1]. Species grown for ornamental purposes include petunia and Nicotiana species. While not consumed for food, these horticultural species are a substantial component of the US agronomic economy. For example, petunia represents greater than $148M output per year in the US [2]. Tobacco represents another crop of significant economical importance with $1.6B in crop value in 2003 [3]. A close relative of tobacco, Nicotiana b
Study on Gambogic Acid-loaded Polylacticacid nanoparticles
藤黄酸聚乳酸纳米粒的研制

LI Shu-zhen,OUYANG Wu-qing,
李树珍
,欧阳五庆

中国生物工程杂志 , 2008,
Abstract: 以新型材料聚乳酸(PLA)为载体,研制出质量稳定的藤黄酸聚乳酸纳米粒(GA-PLA-NPs)乳液制剂,并对其安全性进行评价.采用改良的溶剂蒸发法制备藤黄酸聚乳酸纳米粒(GA-PLA-NPs);用透射电子显微镜(TEM)观察纳米粒的形态;用激光粒度分析仪测定其平均粒径大小和分布;经超速离心后用紫外分光光度计测定纳米粒的包封率与载药量;考察藤黄酸纳米粒的体外释放特性;经急性毒性实验考察藤黄酸纳米粒的安全性.得到确定处方工艺为:水相∶有机相为2∶1(v/v),表面活性剂在有机相中的浓度为0.5%(w/v),藤黄酸(GA)在有机相中的浓度为0.1%(w/v),GA∶PLA为1∶4(w/w).处方条件下制备的纳米粒平均粒径为51.36 nm;平均包封率与载药量分别为98.87%和13.3%;藤黄酸纳米粒的体外释药分为两相:突释期和缓释期;急性毒性试验测得藤黄酸纳米粒的ID50为26.3mg/kg.制备的藤黄酸聚乳酸纳米粒(GA-PLA-NPs)质量稳定、分散性良好;聚乳酸可能成为藤黄酸的新型载体.
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