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Search Results: 1 - 10 of 120061 matches for " Yajie Wang "
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On the Motivation and the English Achievement in the Senior Middle School
Yajie Su,Yanli Wang
Asian Social Science , 2009, DOI: 10.5539/ass.v5n2p69
Abstract: Motivation is one of the important factors that influences English learning achievement. That’s true of the students in the Senior Middle School. In order to improve the students’ English performance, a research by means of a questionnaire and an interview is done in a key Senior School on the motivation in learning English in order to improve the English teaching. The results showed that the motivation has a close relationship with the students’ performance. But the different strength in motivation will lead to different learning efficiency. So to help the students to maintain a proper strength in English learning motivation is very necessary for the teachers in the daily teaching procedure. Finally, some suggestions are available to the teachers.
The Current Account Balance of Pakistan 1972-2005: A Cointegration Analysis
Saqib Gulzar,Hui Xiao Feng,Wang Yajie
Information Technology Journal , 2007,
Abstract: This study aims to find the factors that influence the current account balance of Pakistan. In this study, we utilized cointegration and error correction modeling techniques in estimating the long run behavioral relationship between Pakistan’s current account balance and different economic variables. The empirical results advocate that there exists a significant long term relationship between the current account balance and the balance of trade, domestic saving, total consumption and workers remittances during the observed period 1972 to 2005.
Molecular Analysis of the Alpha-Tubulin Gene from the Microsporidium, Endoreticulatus sp. Zhenjiang, Isolated from Bombyx mori  [PDF]
Shengyan Xiao, Zhongyuan Shen, Xudong Tang, Li Xu, Xuliang Fu, Yajie Yue, Nan Li, Wei Wang
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.510095
Abstract:

We isolated a microsporidium from the silkworm, Bombyx mori, and classified it as Endoreticulatus sp. Zhenjiang based on morphological characteristics and phylogenetic analyses of ribosomal sequences. This microsporidium causes silkworm pebrine, although its original host and mode of transmission are unknown. To better understand its distribution and transmission mode, it is essential to have species specific molecular markers. Towards this goal, we characterized the alpha tubulin gene from Endoreticulatus sp. Zhenjiang in this study. The full-length alpha-tubulin cDNA from Endoreticulatus sp. Zhenjiang was cloned and sequenced (GenBank ID: KJ784483) using the rapid amplification of cDNA ends (RACE) protocol. The alpha-tubulin cDNA is 1382 bp long with an open reading frame spanning 1320 bp and consisting of a short 20-bp 5’-untranslated region (5’-UTR) and a 42-bp 3’-UTR with a stop codon and a poly (A) tail. This alpha-tubulin cDNA encodes a deduced polypeptide with 439 amino acids, including a complete tubulin domain and a tubulin C domain. This protein has an estimated isoelectric point of 5.1 and a predicted molecular weight of 48.6 kDa.

Cloning and Characterization of a Mitogen-Activated Protein Kinase Gene 84KMPK14 in Hybrid Poplar (Populus alba × P. glandulosa cv. “84K”)  [PDF]
Ye Zhao, Dan Wang, Yongqiang Zhang, Yajie Niu, Xiaojuan Zong, Yan Ma, Xianfeng Guo, Jing Guo
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.913186
Abstract: Mitogen-activated protein kinases (MAPKs) are important components in signal transduction modules which play crucial roles in regulation of many biological processes in plants. Although genome-wide analysis of MAPK and MAPKK family has been carried out in poplar species, few data about the biological function analysis of this gene family are available to date. In this study, a group C MAPK gene 84KMPK14 was cloned from hybrid poplar (Populus alba × P. glandulosa cv. 84K). It contained a typical protein kinase domain, a conserved TEY-motif and an atypical conserved common docking (CD) domain. Sequence alignment revealed that 84KMPK14 was the most homologous to Populus trichocarpa PtMPK14. Expression analysis indicated
The Qualitative Analysis for a Class Nonlinear Systems with High Degree  [PDF]
Songlin Chen, Yajie Du
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.65087
Abstract: In the paper, the problems of identification of focus or center for a class of nonlinear systems are studied. As results, the identifying rule for the type of singular point of the system and the calculating formula for the focus value are obtained by the classical theory of Poincare and Lyapunov. At the end, the numerical simulation for a polynomial system of seven-degree are showed to corroborate the theoretical results of the method.
Mullite whiskers prepared by molten salt method using Si powders
Wei Wang,Hongwei Li,Yajie Guo,Qiang Sun,Chen Chen
Journal of Advanced Ceramics , 2012, DOI: 10.1007/s40145-012-0028-7
Abstract: Mullite whiskers were prepared from Si powders in molten Al2(SO4)3-Na2SO4 mixture salts with different Al/Si molar ratio (R) of raw materials. The resulting mullite whiskers, had been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and infrared spectroscopy analysis (FT-IR). Mullite phase was obtained in molten salts when the temperature reached at 850 °C. SEM and EDS results revealed that two kinds of microstructures were formed in the final product, Al-rich mullite pellets and clusters of tiny mullite crystals, and the content of Al-rich mullite pellets increased with the higher Al/Si molar ratio (R) adopted in raw materials. A new oxidation-dissolution mechanism was proposed to explain mullite whiskers growth. According to thermodynamic analysis, mullite phase might be spontaneously formed as the temperature reached the decomposition temperature of aluminum sulfate (1023 K).
The expression of Skp2 in human non-small cell lung cancer and its correlation with expression of p27 protein
Xiaohua HU,Feng LIU,Bin JIANG,Yajie WANG
Chinese Journal of Lung Cancer , 2008,
Abstract: Background and objective S-phase kinase-associated protein 2 (Skp2) is one of the positive regulators of the cell cycle that promote Ubiquitin-mediated proteolysis of the cyclin-dependent kinase inhibitor p27. Its overexpression has been implicated in tumorigenesis. In this study, we investigated the expression of Skp2 in human non-small cell lung cancer (NSCLC) and its relationship with expression of p27 protein. Methods The expression of Skp2 and p27 protein were detected in 68 NSCLC, 17 normal bronchial epithelium by the tissue chip and immunohistochemistry technology. Results Skp2 was only expressed in NSCLC patients, there was closely relationship among Skp2 expression and histological subtype, cellular differentiation, sex and smoking; Otherwise, there was no relationship among skp2 expression and age or TNM stage. The expression of p27 protein was found in normal bronchial epithelial cells, and the expression was reduced in NSCLC. The expression of p27 was significantly reduced in patients with positive expression of Skp2. Expression of Skp2 was negatively correlated with expression of p27. Conclusion The expression of Skp2 is up-regulated in NSCLC, and overexpression of Skp2 reduces the protein level of p27 through ubiquitin-dependent degradation, indicating Skp2 may play an important role in oncogenesis and development of NSCLC.
Descriptive Study of the Environmental Epidemiology of High Lung Cancer Incidence Rate in Qujing, Yunnan, China
Linlin ZHANG,Jihua LI,Yajie WANG,Guoping WU
Chinese Journal of Lung Cancer , 2012, DOI: 10.3779/j.issn.1009-3419.2012.03.05
Abstract: Background and objective Qujing, located in Southwest China, is an area with an extremely high lung cancer incidence. Combustion of coal has exposed local people to great health hazards. The aim of this study is to achieve a thorough understanding of the relationship between environmental pollution and the high incidence of lung cancer in Qujing, Yunnan Province, China. The results would provide a scientific basis and support for the etiology of lung cancer, as well as suggestions on improving the environmental conditions in the area. Methods A total of 280 rural villages were selected through stratified cluster random sampling. Environmental background and pollution were investigated, including details on fuel type, coking plant, metal smelting, and chemical plant, among others. Logistic regression analysis was used to analyze the investigated factors. Results Out of the total number of local villages studied, 78.1% of those with high incidence often use smoky coal and coking. On the other hand, 78.8% of the low-incidence areas use smokeless coal or wood. Logistic regression analysis indicated that the coal type used for everyday life was a main risk factor related to lung cancer (P<0.05). Using smoky and coking coals create an alarmingly high risk for developing lung cancer. Meanwhile, smokeless coals and wood seemed to have no significant relationship to the lung cancer incidence. Conclusion The fuel type used for everyday life is an important factor in the high incidence of lung cancer in Qujing. Evidently, the use of smoky coal and coke increased the incidence of lung cancer, whereas smokeless coal and wood seem to bring about the contrary.
Habitat Association and Conservation Implications of Endangered Francois’ Langur (Trachypithecus francoisi)
Yajie Zeng, Jiliang Xu, Yong Wang, Chunfa Zhou
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0075661
Abstract: Francois’ langur (Trachypithecus francoisi) is an endangered primate and endemic to the limestone forests of the tropical and subtropical zone of northern Vietnam and South-west China with a population of about 2,000 individuals. Conservation efforts are hampered by limited knowledge of habitat preference in its main distribution area. We surveyed the distribution of Francois’ langur and modeled the relationship between the probability of use and habitat features in Mayanghe National Nature Reserve, Guizhou, China. The main objectives of this study were to provide quantitative information on habitat preference, estimating the availability of suitable habitat, and providing management guidelines for the effective conservation of this species. By comparing 92 used locations with habitat available in the reserve, we found that Francois’ langur was mainly distributed along valleys and proportionally, used bamboo forests and mixed conifer-broadleaf forests more than their availability, whereas they tended to avoid shrubby areas and coniferous forests. The langur tended to occur at sites with lower elevation, steeper slope, higher tree canopy density, and a close distance to roads and water. The habitat occupancy probability was best modeled by vegetation type, vegetation coverage, elevation, slope degree, distances to nearest water, paved road, and farmland edge. The suitable habitat in this reserve concentrated in valleys and accounted for about 25% of the total reserve area. Our results showed that Francois’ langur was not only restricted at the landscapes level at the regions with karst topography, limestone cliffs, and caves, but it also showed habitat preference at the local scale. Therefore, the protection and restoration of the langur preferred habitats such as mixed conifer-broadleaf forests are important and urgent for the conservation of this declining species.
Isolation and Identification of CD133 Positive and Negative Cells from Human Lung Cancer and Screening of the Differential Genes between the Positive and Negative Cells
Shaoqiu ZHENG, Shuhua LI, Hongyan WANG, Xiaobin XIE, Yajie ZHANG
- , 2015, DOI: : 10.3779/j.issn.1009-3419.2015.03.01
Abstract: Background and objective It has been proven that cancer stem cell existed in variety of cancer, which an significant difference of biological characteristics was observed between the cancer stem cells and non-cancer stem cells. And CD133 is considered to be cancer stem cell marker. So there may be significant differences in CD133- positive cells and CD133-negative cells. The aim of this study is to isolate CD133+ cells and CD133- cells from lung cancer cell line A549, explore their biological characteristics and screen the metastasis-related genes. Methods MACS was applied to isolate CD133+ cells and CD133- cells from human lung cancer cell line A549. To observe the formation of sphere, CD133+ cells and CD133- cells were cultured in serum-free DMEM-F12 medium (containing EGF, bFGF) in vitro. The colony formatting efficiency of CD133+ cells, CD133- cells and cells without sorting was tested by colony-forming assay. The differentiation of sphere was induced by culturing in DMEM-F12 medium (containing serum). The metastasis-related genes (84 genes) of CD133+ cells and CD133- cells were detected by using DNA microarray. Immunohistochemistry was used to detect the expression of CD133 protein in Human lung cancer tissue. Results CD133+ cells formed sphere in serum-free DMEM-F12 medium,while the CD133- cells failed to form sphere. The rates of CD133+ cell colony formation (57.1%) was significantly higher than that of CD133- cells (3.3%). Sphere (CD133+/CK7-) was induced to differentiate, and CK7 expression was found in differentiated cells. The expression levels of 19 metastasis-related genes from CD133+ cells and CD133- cells were significant different. Little CD133 positive cells which distributing around the cancer nests were found in lung cancer tissue. The expression of CD133 was not related to tumor types, cell differentiation or TNM stage. Conclusion CD133+ cells exhibit the characteristics of cancer stem cells. The difference of metastasis-related gene expression levels was discovered between CD133+ cells and CD133- cells. CD82 plays an important role in mechanism of tumor metastasis.
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