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Zhenyu Yun,Zhao Sun,Haiyan Xu,Zhihong Sun,Yao Zhang,Zhen Liu 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.2
Dalian sea cucumber, Yantai sea cucumber, and Weihai sea cucumber, which belong to Apostichopus japonicus, are protected as geographical indications in China based on their high nutritional values and medical propertys. The 26 samples, including Dalian sea cucumbers (9 samples) in Liaoning province, Yantai sea cucumbers (9 samples), and Weihai sea cucumbers (8 samples) in Shandong province, were individually collected from the designated geographical sea areas and the genetic relationships and DNA polymorphisms were evaluated by random amplified polymorphic DNA technology and gene segments sequencing. The RAPD dendrogram showed that the genetic diversity of the three types of sea cucumbers was rich. The neighbor-joining tree shows that the genetic relationship of the samples from the adjacent sea areas is closer. It demonstrates that the gene characteristics of sea cucumbers from different sea areas were obvious and the genetic diversity analysis by RAPD-PCR can be used as a rapid method for geographical discrimination.
Chunjiang Fu,Xiaowen Yao,Tao Li,Haiyao Shen,Zhenyu Wang,Jianqun Jiang 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6
The investigation of abnormal increases in uplift pressure can lead to the discovery of seepage paths that may cause damage to concrete arch dams. A new methodology has been developed in this study in order to analyze the causes of abnormally high uplift pressure increases and their influence on the structural safety assessments of dams. A series of borehole video tests were performed on an area of the Huaguangtan Dam and its foundations in order to investigate seepage phenomena under different working conditions. The reasons for the existence of the seepage paths causing abnormally high uplift pressures were identified by examining stresses on the dam, using a detailed three-dimensional numerical model. The results from the monitoring and on-site inspection showed that the high uplift pressure did not constitute a direct threat to the dam’s safety. However, grouting treatment of the existing cracks was recommended so as to prevent them from developing further within the dam’s foundations and to ensure the long-term stability of the foundation seepage. It was concluded that the methodology in this study could be used to solve practical engineering problems effectively as well as acting as a frame of reference for similar projects.