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Your search keyword '"Gao, Yazhi"' showing total 3 results
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3 results on '"Gao, Yazhi"'

2. Curing kinetics and mechanical properties of the epoxy vitrimer based on transesterification and its composite laminates.

Author

Chang, Zhengping, Gao, Yazhi, Yan, Kanghe, Wang, Zhongqi, Zhao, Menglin, and Zhao, Yang

Subjects
CARBON fiber-reinforced plastics, THERMODYNAMICS, THERMOSETTING composites, MOLECULAR structure, DIFFERENTIAL scanning calorimetry, LAMINATED materials
Abstract

The resin is a fundamental factor in determining the performance and usage conditions of its composites. The epoxy vitrimer, which combines both thermoplastic and thermosetting properties, shows significant potential in extending the service life of material. The curing process significantly affects the macroscopic properties of the vitrimer and the resulting carbon fiber reinforced plastics (CFRP). Effective control of curing parameters constitutes the critical factor for the assurance of product quality. In the study, a differential scanning calorimetry (DSC) was utilized to establish a curing kinetics model for a modified, self‐healable epoxy vitrimer based on transesterification. Then the molecular structure, thermodynamic, and mechanical properties of the cured vitrimer were analyzed. Next vitrimeric CFRP (vCFRP) laminates were fabricated, and the tensile and bending properties of the vCFRP laminates were investigated. The results showed the curing process was obtained: 95°C/1 h + 150°C/2 h + 170°C/2 h. The thermodynamic and mechanical properties of cured vitrimer could meet practical requirements. The minimal differences observed in the stress–strain curves of the specimens indicated that the curing process was appropriately configured. The prepared laminates exhibited performance comparable to that of commercial thermosetting composites. [ABSTRACT FROM AUTHOR]

Published
2024
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3. AlternariaTeA toxin activates a chloroplast retrograde signaling pathway to facilitate JA-dependent pathogenicity

Author

Shi, Jiale, Wang, He, Li, Mengping, Mi, Liru, Gao, Yazhi, Qiang, Sheng, Zhang, Yu, Chen, Dan, Dai, Xinbin, Ma, Hongyu, Lu, Huan, Kim, Chanhong, and Chen, Shiguo

Abstract

The chloroplast is a critical battleground in the arms race between plants and pathogens. Among microbe-secreted mycotoxins, tenuazonic acid (TeA), produced by the genus Alternariaand other phytopathogenic fungi, inhibits photosynthesis, leading to a burst of photosynthetic singlet oxygen (1O2) that is implicated in damage and chloroplast-to-nucleus retrograde signaling. Despite the significant crop damage caused by Alternariapathogens, our understanding of the molecular mechanism by which TeA promotes pathogenicity and cognate plant defense responses remains fragmentary. We now reveal that A. alternatainduces necrotrophic foliar lesions by harnessing EXECUTER1 (EX1)/EX2-mediated chloroplast-to-nucleus retrograde signaling activated by TeA toxin–derived photosynthetic 1O2in Arabidopsis thaliana. Mutation of the 1O2-sensitive EX1-W643 residue or complete deletion of the EX1 singlet oxygen sensor domain compromises expression of 1O2-responsive nuclear genes and foliar lesions. We also found that TeA toxin rapidly induces nuclear genes implicated in jasmonic acid (JA) synthesis and signaling, and EX1-mediated retrograde signaling appears to be critical for establishing a signaling cascade from 1O2to JA. The present study sheds new light on the foliar pathogenicity of A. alternata, during which EX1-dependent 1O2signaling induces JA-dependent foliar cell death.

Published
2024
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