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Wang Yang,Jin Mingxia,Wang Yiming,Yang Ying,Yu Ailin 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.2
In order to determine whether the pine wood nematode (PWN), Bursaphelenchus xylophilus can be transmitted into the pine twigs through the needles, and to identify the transmission characteristics, inoculation experiments were conducted on intact pine seedlings and detached pine needles. The experimental results indicate that PWNs could infest pine needles through wounds. Resin ducts distributed in the pine needles were the route for PWN movement. The fastest movement speed of PWN through pine needles was 2.0 cm/h, with an average fastest speed of 0.92 cm/h. PWNs could be transmitted into pine twigs within 12 h of being inoculated onto attached pine needles, ultimately leading to fatal pine wilt disease. This is the first report of PWN infestation and the induction of pine wilt disease through pine needles. After PWN infected pine needles, not all of them entered the twigs, with some nematodes colonized in the needles, where they reproduced.
Wang Yang,Liu Xiaohua,Wang Yiming,Jin Mingxia,Xie Guai,Zhong Qiuping,Yu Ailin 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1
To explore the molecular mechanism of honeybees (Apis mellifera L.) poisoning death by ingestion of Camellia oleifera nectar, feeding experiments were designed to investigate the poisoning effects. Observed the develop ment process of poisoning symptoms, and collected bees at key experimental nodes for transcriptome sequencing analysis. The results showed that the first poisoning symptom was observed within 0.5 h after ingestion of Camellia oleifera nectar, with death occurring as early as 2 h post-ingestion and all honey bees dying within 4 h. There were four stages in the development of poisoning symptoms: normal flying, crawling (abdominal swelling, inability to fly normally), fluttering (inability to crawl normally), and death. Transcriptome sequencing analyzed the causes of poisoning death indicated that honey bee poisoning occurred with the transduction of dietary restriction signals into cells, resulting in the down-regulated expression gene elements that ensure cell health and inhibit apoptosis, including intracellular NAD+-dependent protein deacetylase sirtuin 1, insulin-like growth factor 1, and heat shock proteins. At the same time, the expression of cysteinyl aspartate specific proteinase 7, which protects programmed cell apoptosis, was also downregulated, resulting in the rapid and disorderly deaths of a large number of cells in individuals in a short period of time, and eventually leading to bees fatality.
Xiaoqin Yin,Mingxia Wang 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.1
Pro-active head restraint is a new automotive safety device with both active safety and passive safety characteristics. It can make a pre-estimation of the occurrence possibility of rear-end collision. Thus, the whiplash injury can be effectively reduced or even prevented. One of the key elements in rear-end collision avoidance system is to establish an effective safety distance mathematical model. Based on the running state of front car, the related calculation models of safety distance are established by means of dynamical and kinematical analysis of vehicle braking process and following process. Taken randomness and dynamic characteristics of parameters into consideration, the fuzzy relations between these parameters should be validated by means of fuzzy theory. Thus, it may accord with the actual driving conditions. By using the MATLAB software, the study shows that safety distance model and the methods used to determine parameters are reasonable, and the false alarm can be effectively minimized.
Effect of pH on Types of Acidogenic Fermentation of Fruit and Vegetable Wastes
Mingxia Zheng,Mingyue Zheng,Yuanyuan Wu,Hailing Ma,Kaijun Wang 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.2
The effect of pH (4.0, 5.0, and 6.0) on acidification and fermentation of fruit and vegetable wastes was investigated using batch and semi-continuous experiments under mesophilic condition. Results showed that fermentation types change with pH variation. The pH of acidification system containing fruit and vegetable wastes could automatically decrease to 3.0 ~ 4.0. At this pH range, a stable ethanol production was observed, at which ethanol-type fermentation was obtained. Based on the results, the fermentation types were classified into ethanol-type, mixed acid-type, propionic acid-type, and butyric acid-type fermentations, which occurred at pH 4.0 ~ 4.5, 4.5 ~ 5.0, 5.0 ~ 5.5, and 5.5 ~ 6.5, respectively.
Lin Yuanyuan,He Mingxia,Wang Jielin,Huang Junchao 한국식물학회 2021 Journal of Plant Biology Vol.64 No.5
Tomato is a major source of dietary carotenoids that play an important role in human health. Improving the carotenoid profiles of tomato fruit has become a primary aspect in tomato breeding. The tomato ‘Huang Song’ landrace grows vigorously but with low contents of carotenoids in this yellowish fruit. To overcome this problem and extend lycopene to high-value astaxanthin, we co-expressed four genes encoding for phytoene synthase (crtB), β-carotene hydroxylase (BHY), β-carotene ketolase (BKT), and lycopene β-cyclase (LCYB), respectively, in the fruit of the landrace via linking the genes with 2A-sequences and driving their expression with the E8 promoter. The transgenic lines showed similar phenotypes to WT except for the fruit colors. The transgenic fruit exhibited deep red color due to the accumulation of novel ketocarotenoids including astaxanthin, canthaxanthin, and ketolutein and enhanced production of native carotenoids which were 20 ~ 44-fold of the control. The T0, T1, and T2 plants exhibited similar growing status and carotenoid profiles, indicating that the transformants were genetically stable. The transgenes resulted in upregulation of most of the endogenous carotenogenic genes in fruit at mature green stage and more plastoglobules in chromoplast. This study provides insights into metabolic engineering of tomato for enhanced production of value-added carotenoids.
Biao Liu,Zhengzhong Wang,Bo Zhang,Ningjun Du,Mingxia Gao,Guoliang Bai 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.2
In order to study the seismic response of the main plant of steel reinforced concrete (SRC) structure of the CAP1400 nuclear power plant under the influence of different high-mode vibration, the 1/7 model structure was manufactured and its dynamic characteristics was tested. Secondly, the finite element model of SRC frame-bent structure was established, the seismic response was analyzed by mode-superposition response spectrum method. Taking the combination result of the 500 vibration modes as the standard, the error of the base reactions, inter-story drift, bending moment and shear of different modes were calculated. Then, based on the results, the influence of high-mode vibration on the seismic response of the SRC frame-bent structure of the main plant was analyzed. The results show that when the 34 vibration modes were intercepted, the mass participation coefficient of the vertical and horizontal vibration mode was above 90%, which can meet the requirements of design code. There is a large error between the seismic response calculated by the 34 and 500 vibration modes, and the error decreases as the number of modes increases. When 60 modes were selected, the error can be reduced to about 1%. The error of the maximum bottom moment of the bottom column appeared in the position of the bent column. Finally, according to the characteristics of the seismic influence coefficient αj of each mode, the mode contribution coefficient γj•Xji was defined to reflect the contribution of each mode to the seismic action.