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- 검색키워드
- 저자 : Meng Xianfeng (검색결과 3 건)
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Meng Zhang,Xianfeng Qiao,Xiong Peng,Maohua Chen 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.2
The bird cherry-oat aphid, Rhopalosiphumpadi (L.) (Hemiptera: Aphididae), is an important pest insect ofwheat, Triticum aestivum (L.), in China. The susceptibility and resistance of wheat cultivars to different populations of R. padi have been rarely reported. In the current study, eight R. padi populations were collected from different provinces of China, the resistance or susceptibility of six wheat cultivars (Emai 596, Emai 18, Emai 251, Zhengmai 98, Xanthus and 35A9B) to these eight populations was tested by the ratio of aphid abundance according the standard method previously reported. The results showed that R. padi populations from Lanzhou of Gansu Province and Taian of Shandong Province showed similar pattern of aphid-host reactions among the six wheat cultivars. Populations from Nanyang of Henan Province and Baicheng of Jilin Province shared a different pattern of reaction. The respective populations from Xianyang of Shaaxi Privince, Beibei of Chongqing Province, Hongtong of Shanxi Province and Baoding of Hebei Province showed unique resistance/susceptible patterns of aphid-host reactions from other populations. The variability in the response to wheat cultivars to R. padi indicated the existence of biotypic variation in populations. The weight of adult aphid survivors of different populations varied on six wheat cultivars, but did not correspond well to the susceptibility and resistance of wheat cultivars. Our findings are important for the sustainable control of R. padi in different wheat growing regions of China.
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Experimental Investigations on VIV of Bridge Deck Sections: A Case Study
Zeng-shun Chen,Si-meng Liu,Xianfeng Yu,Cun-ming Ma,Lei Liu 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.7
In this paper, the Vortex Induced Vibrations (VIVs) of bridge deck sections of the Hong Kong-Zhuhai-Macao Bridge were investigated experimentally. Aeroelastic tests for the bridge deck of two scale ratios (1:20 model and 1:50 model) under different wind attack angles, wind speeds, and damping ratios were performed. Accessory and windbreak effects on the VIVs of the bridge deck were also carried out. The experimental results show that the accessory and windbreak tend to enlarge the VIVs of the bridge deck. Furthermore, the most unfavorable wind attack angle is 5o. At this attack angle and low damping ratios, the VIVs of the bridge deck are significant and much larger than the allowable value. In addition, the VIVs of the bridge deck decrease with increasing the damping ratios (Particularly, at large damping ratios, the VIVs were well suppressed). This study provides a guideline for the designs of long span flexible bridges on suppressing the VIVs of the bridges.
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Liu Zhaohua,Tan Xiuwen,Wang Jianying,Jin Qing,Meng Xianfeng,Cai Zhongfeng,Cui Xukui,Wang Ke 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.9
Objective: Luxi Black Head sheep (LBH) is the first crossbreed specialized for meat production and was developed by crossbreeding Black Head Dorper sheep (DP) and Small Tailed Han sheep (STH) in the farming areas of northern China. Research on the genomic variations and selection signatures of LBH caused by continuous artificial selection is of great significance for identifying the genetic mechanisms of important traits of sheep and for the continuous breeding of LBH.Methods: We explored the genetic relationships of LBH, DP, and several Mongolian sheep breeds by constructing phylogenetic tree, principal component analysis and linkage disequilibrium analysis. In addition, we analysed 29 whole genomes of sheep. The genomewide selection signatures have been scanned with four methods: heterozygosity (HP), fixation index (FST), cross-population extended haplotype homozygosity (XP-EHH) and the nucleotide diversity (θπ) ratio.Results: The genetic relationships analysis showed that LBH appeared to be an independent cluster closer to DP. The candidate signatures of positive selection in sheep genome revealed candidate genes for developmental process (HoxA gene cluster, BCL2L11, TSHR), immunity (CXCL6, CXCL1, SKAP2, PTK6, MST1R), growth (PDGFD, FGF18, SRF, SOCS2), and reproduction (BCAS3, TRIM24, ASTL, FNDC3A). Moreover, two signalling pathways closely related to reproduction, the thyroid hormone signalling pathway and the oxytocin signalling pathway, were detected.Conclusion: The selective sweep analysis of LBH genome revealed candidate genes and signalling pathways associated with developmental process, immunity, growth, and reproduction. Our findings provide a valuable resource for sheep breeding and insight into the mechanisms of artificial selection.
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