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Search Results: 1 - 10 of 12142 matches for " Yanyan Qin "
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MtsR, an Iron-Dependent Regulator in Streptococcus iniae  [PDF]
Jun Wang, Peng Wang, Yanyan Qin, Lili Zou
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.95042
Abstract: Streptococcus iniae (S. iniae) is a major pathogen that is capable of resulting severe economic loss to cultured fish. Steadily iron availability from micro-environment is an important virulence factor for pathogens, and S. iniae encodes the iron-transporter MtsABC to accomplish heme utilization, but very little was known about the mechanisms involved in regulating and maintaining iron balance in S. iniae. In this study, the role of a putative iron-dependent transcriptional regulator MtsR was investigated, and the results showed that MtsR regulated the expression of iron-transport mtsABC to control iron homeostasis in S. iniae.
Risk factors for myopia in Inner Mongolia medical students in China  [PDF]
Yanyan Wu, He Yi, Wenzhong Liu, Haiying Jia, Yuki Eshita, Shubi Wang, Peng Qin, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2012, DOI: 10.4236/ojepi.2012.24013
Abstract: Objective: The aim of the study was to investigate myopia and related factors in Inner Mongolia Medical Students, China. Methods: The survey employed a self-administered questionnaire. All medical students from the Inner Mongolia Medical University campus and those living and learning on campus were eligible. The questionnaire consisted of three sections: students’ basic information, attitude on myopia behavior, and myopia status of students. 6047 medical students completed the questionnaire. Results: A total of 6040 (90.5%) students aged 16 to 28 years (mean 21 ± 1.5 years) completed the questionnaire, of which 1772 (29.3%) were male and 4268 (70.6%) were female. The Mongolia of medical students had the lowest rate (64.3%) of myopia. The prevalence of myopia in Han nationality was highest (72.8%). Myopia occurred more frequently among students living in the city than in the rural. 76.4% urban and 66.6% rural students had myopia (p < 0.001). For myopia students it was established that 85.5% had begun to wear spectacles in middle school. Conclusion: A high myopia prevalence was demonstrated among medical students in the Inner Mongolia area of China. Our study’s findings could help health care professionals develop targeted myopia control policies for the population of students in Inner Mongolia of China and ensure the policies are more rational, useful, and effective.
The impact of academic stress on medical students attending college in the Inner Mongolia Area of China  [PDF]
Jie Chen, Yanyan Wu, He Yi, Zhijun Li, Yuki Eshita, Peng Qin, Lifu Chen, Juan Sun
Open Journal of Preventive Medicine (OJPM) , 2013, DOI: 10.4236/ojpm.2013.32019

The aim of this study was to examine whether student characteristics affect the risk of health conditions, and explore whether the degree of academic stress affects the level of distress. We surveyed medical students in the Inner Mongolia Medical College China using a questionnaire. A logistic regression analysis was used to ascertain factors associated with distress. The Wilcoxon Mann-Whitney test was used to determine the relationship between distress and different academic stress levels. Of the 6044 students completing questionnaires, 47.5% self-reported distressing body symptoms induced by academic stress. Chi square tests showed statistically significant associations between distress and gender, academic stress, and residence; feeling academic stress caused a more than 1.5 times risk of distress. Gender and academic stress were significantly associated with distress in non-conditional binary logistic regression models. Compared with male students, female students was more likely to feel distress. The Wilcoxon Mann-Whitney test also showed that the distress rate increased with academic stress and a dose-response relationship between the distress rate and stress level was found. The present study indicates that it is important to reduce academic stress and manage it in order that better outcomes be achieved in regard to distress, especially in females.

Extraction and Purification of a Lectin from Red Kidney Bean and Preliminary Immune Function Studies of the Lectin and Four Chinese Herbal Polysaccharides
Yufang Hou,Yubao Hou,Liu Yanyan,Guang Qin,Jichang Li
Journal of Biomedicine and Biotechnology , 2010, DOI: 10.1155/2010/217342
Abstract: Reversed micelles were used to extract lectin from red kidney beans and factors affecting reverse micellar systems (pH value, ionic strength and extraction time) were studied. The optimal conditions were extraction at pH 4–6 , back extraction at pH 9–11, ion strength at 0.15 M NaCl, extraction for 4–6 minutes and back extraction for 8 minutes. The reverse micellar system was compared with traditional extraction methods and demonstrated to be a time-saving method for the extraction of red kidney bean lectin. Mitogenic activity of the lectin was reasonably good compared with commercial phytohemagglutinin (extracted from Phaseolus vulgaris)Mitogenic properties of the lectin were enhanced when four Chinese herbal polysaccharides were applied concurrently, among which 50 g/mL Astragalus mongholicus polysaccharides (APS) with 12.5 g/mL red kidney bean lectin yielded the highest mitogenic activity and 100 mg/kg/bw APS with 12.5 mg/kg/bw red kidney bean lectin elevated mouse nonspecific immunity.
Solutions with Dead Cores for a Parabolic P-Laplacian Equation  [PDF]
Zhengce Zhang, Yanyan Li
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.15050
Abstract: We study the solutions with dead cores and the decay estimates for a parabolic p-Laplacian equation with absorption by sub- and supersolution method. Special attention is given to the case where the solution of the steady-state problem vanishes in an interior region.
Quenching Rate for the Porous Medium Equation with a Singular Boundary Condition  [PDF]
Zhengce Zhang, Yanyan Li
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.29157
Abstract: We study the porous medium equation ut=(um). 0<x<∞, t>0 with a singular boundary condition (um) (0,t)=u(0,t). We prove finite time quenching for the solution at the boundary χ=0. We also establish the quenching rate and asymptotic behavior on the quenching point.
Classifying Unstructured Text Using Structured Training Instances and an Ensemble of Classifiers  [PDF]
Andreas Lianos, Yanyan Yang
Journal of Intelligent Learning Systems and Applications (JILSA) , 2015, DOI: 10.4236/jilsa.2015.72006
Abstract: Typical supervised classification techniques require training instances similar to the values that need to be classified. This research proposes a methodology that can utilize training instances found in a different format. The benefit of this approach is that it allows the use of traditional classification techniques, without the need to hand-tag training instances if the information exists in other data sources. The proposed approach is presented through a practical classification application. The evaluation results show that the approach is viable, and that the segmentation of classifiers can greatly improve accuracy.
CSRecommender: A Cloud Service Searching and Recommendation System  [PDF]
John Wheal, Yanyan Yang
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.36007
Abstract: Cloud Computing and in particular cloud services have become widely used in both the technology and business industries. Despite this significant use, very little research or commercial solutions exist that focus on the discovery of cloud services. This paper introduces CSRecommender—a search engine and recommender system specifically designed for the discovery of these services. To engineer the system to scale, we also describe the implementation of a Cloud Service Identifier which enables the system to crawl the Internet without human involvement. Finally, we examine the effectiveness and usefulness of the system using real-world use cases and users.
Cross-National Analysis on Sensitivity to Environmental Quality and Its Change in East Asia  [PDF]
Yanyan Chen, Yuejun Zheng
Advances in Applied Sociology (AASoci) , 2015, DOI: 10.4236/aasoci.2015.56018
Abstract: This paper aims to compare people’s sensitivity to environmental change in China, Japan and South Korea across spatial and temporal dimensions by analysing the data derived from a cross-national survey. Based on the analytical results derived from 3907 samples, the consistency of people’s environmental sensitivity on the temporal dimension and the gap on the spatial dimension are clarified. The analysis on the temporal dimension indicates that people are inclined to hold a consistent evaluation toward environmental change, while the analysis on the spatial dimension of environmental sensitivity indicates that people are more sensitive to the deterioration of global rather than domestic environmental change. Data analysis also indicates that Japanese and South Koreans are pessimistic regarding the change of the environment while the Chinese are optimistic. In addition, the attributive features of individuals who are more sensitive to the environmental change are clarified within each country, and the results show that under different social backgrounds, the influence of demographic factors is somewhat dissimilar.
Personalized Tag Recommendation Based on Transfer Matrix and Collaborative Filtering  [PDF]
Shaowu Zhang, Yanyan Ge
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.39002
Abstract: In social tagging systems, users are allowed to label resources with tags, and thus the system builds a personalized tag vocabulary for every user based on their distinct preferences. In order to make the best of the personalized characteristic of users’ tagging behavior, firstly the transfer matrix is used in this paper, and the tag distributions of query resources are mapped to users’ query before the recommendation. Meanwhile, we find that only considering the user’s preference model, the method cannot recommend new tags for users. So we utilize the thought of collaborative filtering, and produce the recommend tags based on the query user and his/her nearest neighbors' preference models. The experiments conducted on the Delicious corpus show that our method combining transfer matrix with collaborative filtering produces better recommendation results.
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