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Wenjing Wang,Biao Wu,Zhihong Liu,Liqing Zhou,Xiujun Sun,Jiteng Tian,Aiguo Yang 한국유전학회 2021 Genes & Genomics Vol.43 No.6
Background The ark shell (Scapharca broughtonii) is one of the most economically important mollusks in the Bohai Sea and Yellow Sea of China. In recent years, ark shells from the Korean population were introduced to China for seed propagation and culture. Objective To explore the impact of the introduction of Korean ark shell on the genetic diversity of native population in China. Methods Simple sequence repeat (SSR) is efective and widely used tool for genetic analysis. In this study, 180 EST-SSRs were selected and verifed by polymerase chain reaction and polyacrylamide gel electrophoresis. Subsequently, fve polymorphic EST-SSRs were screened and their primers were modifed by fuorescein for use in the genetic analysis of four populations. Results Genetic analysis showed that 361 alleles amplifed by fve SSR loci were detected in the four populations. The number of alleles for the fve SSRs ranged from 8 to 30, with a mean of 18.05 (standard deviation, SD=6.492). The efective number of alleles varied from 2.253 to 22.222, with a mean of 10.596 (SD=4.713). Observed heterozygosity and expected heterozygosity were 0.167–0.833 and 0.566–0.971, with average values of 0.520 (SD=0.177) and 0.891 (SD =0.062), respectively. Polymorphic information content ranged from 0.521 to 0.953, with a mean of 0.865 (SD=0.070). The pairwise genetic diferentiation coefcient (FST) of the four populations ranged from 0.0267 to 0.0477, showing low genetic diferentiation. The phylogenetic tree constructed by neighbor-joining method showed that the genetic distance between the Chinese Dalian native population and three Korean populations was relatively more far than that among those Korean populations. Conclusion The results indicated that the genetic structure of the Dalian wild population was less afected by the introduced Korean wild populations.
Lejun Zhang,Bo Zhang,Ran Guo,Zhujun Wang,Guopeng Wang,Jing Qiu,Shen Su,Yuan Liu,Guangxia Xu,Zhihong Tian,Sergey Gataullin 한국인터넷정보학회 2024 KSII Transactions on Internet and Information Syst Vol.18 No.4
With the development of covert communication technologies, the number of covert communication technologies using blockchain as a carrier is increasing. However, using the transaction amount of digital currency as a carrier for covert communication has problems such as low embedding rate, large consumption of transaction amount, and easy detection. In this paper, firstly, by experimentally analyzing the distribution of bitcoin transaction amounts, we determine the most suitable range of amounts for matrix decomposition. Secondly, we design a novel matrix decomposition method that can successfully decompose a large amount matrix into two small amount matrices and utilize the elements in the small amount matrices for covert communication. Finally, we analyze the feasibility of the novel matrix decomposition method in this scheme in detail from four aspects, and verify it by experimental comparison, which proves that our scheme not only improves the embedding rate and reduces the consumption of transaction amount, but also has a certain degree of resistance to detection.