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Expression of Yeast YAP1 in Transgenic Arabidopsis Results in Increased Salt Tolerance
Jiqiang Zhao,Shanli Guo,Shihua Chen,Hui Zhang,Yanxiu Zhao 한국식물학회 2009 Journal of Plant Biology Vol.52 No.1
Soil salinity is a major abiotic stress that lowers agricultural production around the world. Mainly caused by elevated levels of NaCl, it induces a wide range of responses in plants. In addition to ion toxicity, high salt levels can induce oxidative stress with the formation and accumulation of reactive oxygen species (ROS). We introduced the transcription factor YAP1, originally from yeast (Saccharomyces cerevisiae), into Arabidopsis thaliana (ecotype Columbia). When treated with various NaCl concentrations, transgenic plants showed increased activities of antioxidant enzymes catalase, superoxide dismutase, ascorbate peroxidase, peroxidase, glutathione S-transferase, and glutathione reductase compared with the wild-type Arabidopsis. This demonstrated that an active oxygen scavenging system was enhanced to protect plants from salt stress by equilibrating ROS metabolism. Transgenic Arabidopsis maintained higher photosynthesis levels and lower amounts of H2O2, suggesting that ROS production was reduced. Physiological analysis implied that transgenic Arabidopsis might employ multiple mechanisms to improve its salt tolerance.
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Jiqiang Tang,Shaopu Zhao,Ying Wang,Kuo Wang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.4
The rotor’s stable suspension is one of significant requirements for a magnetically suspended control momentum gyroscope (MSCMG), the gyroscopic effect is one of rotor’s prominent characteristics. To find out the relationship between rotor’s structure and gyroscopic effect, the inertia-ratio is originally presented and the relationship between the inertia-ratio and gyroscopic effects is researched. To improve the rotor’s suspension stability, the cross feedback control (CFC) method is researched based on modeling the suspension system of rotor and point out that only distributed PID control cannot make rotor’s suspension be stable due to the whirling. To suppress the gyroscopic effects more effectively and sustain the stable suspension within a wider speed range, a CFC method with pre-modulated gains is presented. All research results verify that this presented CFC method can effectively suppress the rotor’s vibration caused by its gyroscopic effects. Experimental results also indicate that a large inertiaratio is helpful to suppress rotor’s gyroscopic effect and can enhance the suspension stability to some extent. In addition, a rotor with angular momentum 200 Nms is designed for a MSCMG by optimizing its inertia-ratio. This paper will provide helpful hint for the research of high-speed rotor’s mechanical design and stable suspension.
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