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( Cai-yun Wang ),( Li-cheng Liu ),( Ying-cai Wu ),( Yi-xuan Zhang ) 한국미생물 · 생명공학회 2021 Journal of microbiology and biotechnology Vol.31 No.8
The transcriptional capacities of target genes are strongly influenced by promoters, whereas few studies have focused on the development of robust, high-performance and cross-species promoters for wide application in different bacteria. In this work, four novel promoters (P<sub>k.r</sub>tufB, P<sub>k.r</sub>1, P<sub>k.r</sub>2, and P<sub>k.r</sub>3) were predicted from Ketogulonicigenium robustum and their inconsistency in the -10 and -35 region nucleotide sequences indicated they were different promoters. Their activities were evaluated by using green fluorescent protein (gfp) as a reporter in different species of bacteria, including K. vulgare SPU B805, Pseudomonas putida KT2440, Paracoccus denitrificans PD1222, Bacillus licheniformis and Raoultella ornithinolytica, due to their importance in metabolic engineering. Our results showed that the four promoters had different activities, with P<sub>k.r</sub>1 showing the strongest activity in almost all of the experimental bacteria. By comparison with the commonly used promoters of E. coli (tufB, lac, lacUV5), K. vulgare (Psdh, Psndh) and P. putida KT2440 (JE111411), the four promoters showed significant differences due to only 12.62% nucleotide similarities, and relatively higher ability in regulating target gene expression. Further validation experiments confirmed their ability in initiating the target minCD cassette because of the shape changes under the promoter regulation. The overexpression of sorbose dehydrogenase and cytochrome c551 by P<sub>k.r</sub>1 and P<sub>k.r</sub>2 resulted in a 22.75% enhancement of 2-KGA yield, indicating their potential for practical application in metabolic engineering. This study demonstrates an example of applying bioinformatics to find new biological components for gene operation and provides four novel promoters with broad suitability, which enriches the usable range of promoters to realize accurate regulation in different genetic backgrounds.
Improving Scanner Data Collection in P4-based SDN
Yun-Zhan Cai,Chih-Hao Lai,Yu-Ting Wang,Meng-Hsun Tsai 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
Port scanning is a well-known behavior when a botnet searches target devices. To detect port scanning accurately, data with high discriminatory power are indispensable. Most related works, however, focus on data analysis methods but neglect storage limitations of switches, which makes their methods impractical. Therefore, we propose a new data collection method for collecting network information of port scanning in P4-based SDN named 0-replacement. Through simulations, we compare the 0-replacement method with two classic data collection methods. Results show that the 0-replacement method improves the true positive ratio by at least 25 percentage points but only consumes 0.36% memory space.
Young Girl Bra’s Market Research and Product Development Based on Functionality Value Study
Cai, Jian-mei;Wen, Yingyu;Gan, Wen-yun 한양대학교 2011 韓國 生活 科學 硏究 Vol.31 No.1
The young girl bra market awaked, it created the industrial value would be unable to estimate. This study sets out to focus on the analysis of young girl bra’s market research and product development based on functionality value. The methodology for this research involves multiple case studies involving girl bra target consumers. Functionality value and related theory guide product development concept as the key point. The research has identified young girl bra market is a size able blank in China. How to guide consumers’consumption awareness correctly by developing the functionality girl bra would be this research’s achievement. The paper linked scientific theory with practical market demand closely, comprehensive analysis of characteristics of adolescent girls in perfect underwear market segment, correct guidance bra consumer market, meet the girl consumer demand, and on the basis of functionality value in girls bra development would better reflected. The observations and analyses of girl bra functionality value would be the core of this paper, which is rarely known by people.
Solving point burnup equations by Magnus method
Yun Cai,Xingjie Peng,Qing Li,Lin Du,Lingfang Yang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
The burnup equation of nuclides is one of the most equations in nuclear reactor physics, which isgenerally coupled with transport calculations. The burnup equation describes the variation of the nuclideswith time. Because of its very stiffness and the need for large time step, this equation is solved byspecial methods, for example transmutation trajectory analysis (TTA) or the matrix exponential methodswhere the matrix exponential is approximated by CRAM. However, TTA or CRAM functions well whenthe flux is constant. In this work, a new method is proposed when the flux changes. It's an improvedmethod compared to TTA or CRAM. Furtherly, this new method is based on TTA or CRAM, and it is moreaccurate than them. The accuracy and efficiency of this method are investigated. Several cases are usedand the results show the accuracy and efficiency of this method are great.
Comparison of drought resistance of rootstocks 'M9-T337' and 'M26' grafted with 'Huashuo' apple
Shi Cai-Yun,Liu Li,Li Qiu-Li,Wei Zhi-Feng,Gao Deng-Tao 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.3
Drought stress is one of the main limiting factors in apple (Malus domestica Borkh.) cultivation. Rootstock plays an important role in the drought tolerance of apple plants. ‘M.9-T337’ is a novel apple rootstock that was recently introduced and widely cultivated in China. In this study, we selected the new, widely promoted Chinese apple variety ‘Huashuo’ as the scion and grafted it onto ‘M.9-T337’ (HM9). Another combination, ‘Huashuo’/‘M.26’/Malus robusta Rehd. (HM26), served as the experimental control to analyse drought resistance in the two hybrids. We believe that this empirical approach is more representative than merely studying rootstock seedlings. After sustained drought stress for over 1 month, the leaf relative water content had decreased in both types of plants, but to a lesser extent in HM26 than in HM9. The SPAD values increased in both plants, but without significant difference. Drought stress reduced photosynthetic activity in both plants, and the net photosynthetic rate was higher in HM26 than in HM9. The observed changes in the chlorophyll fluorescence parameters indicated that drought had damaged the PSII activity centres of both plants, photosynthetic electron transfer was inhibited, and excessive excitation energy accumulated. However, compared to HM26, HM9 displayed lower maximal PSII quantum photochemical efficiency and potential PSII activity. Moreover, HM9 showed lower antioxidant enzyme activity than HM26 under drought stress. A membership function analysis confirmed that ‘M.9-T337’ was less drought resistant than ‘M.26’. Nevertheless, ‘M.9-T337’ could still recover after prolonged drought stress, indicating it also had good drought resistance.