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Keshan Liang,Xin Li,Zhuo Wang,Li Tang,Yujun Cao 한국고분자학회 2023 폴리머 Vol.47 No.2
A multi-scale synergistic modification technology is proposed to strengthen and toughen epoxy resin matrix composites, which can be used in the direct extrusion fabrication process. The toughness performance of epoxy resin matrix composites can be improved without compromising other advantages by adding micrometer- and nanometer-scale fillers to the matrix and optimizing the content of fillers, surface treatment process, dispersion method, and other parameters. We analyzed and discussed the mechanical properties of epoxy-based composites with micrometer-scale fillers, nanometer-scale fillers, and mixed multi-scale fillers. When 15 phr carbon fibers (15CFs), 6 phr rubber nanoparticles (6RNPs), and 1 phr carbon nanotubes (1CNTs) are added to epoxy resins (EPs), the tensile strength reached 91.6 MPa, 28.8% higher than that of the pure EPs; the achieved elastic modulus 4.72 GPa, 77.4% higher than the pure EPs; the fracture toughness was 2.97 MPa m1/2, 241.4% of the pure EPs, while the impact strength reached 63.4 kJ/m2, 369.6% higher than the pure EPs. The results show that the multi-scale reinforcements exhibit a synergistic effect on the strength and toughness of the composites.
Ni Ping,Zhao Xiang,Liang Yujun 한국유전학회 2022 Genes & Genomics Vol.44 No.12
Background: Nile tilapia (Oreochromis niloticus), an important economic freshwater fish being cultured globally, is highly adaptable to a wide range of salinities. However, little information is currently available on the mechanism of salinity adaptation. Objective: For a better understanding of this intriguing adaptability, we identified and analyzed aquaporins (AQPs), which are channel proteins with a basic function of intracellular and intercellular transportation for water and certain solutes. Methods: In the present study, we performed genome-wide identification and comprehensive analysis of the duplicated AQP genes in Nile tilapia by bioinformatics methods. Tissue-specific analyses were then combined with transcriptome data under different salinity treatments. Results: It was revealed that Nile tilapia has a total of twenty-eight AQPs, which are distributed unevenly on twelve chromosomes and belong to four subfamilies according to phylogenetic analysis. These AQPs share conserved AQP characteristic structural domains and motifs, although they differ in molecular weight from 23 to 36 kDa and contain distinct sequences. GO analysis revealed that most AQPs have transporter protein activity and are involved in biological processes such as substance transport, stress response, development and metabolism. KEGG enrichment analysis showed that AQPs were significantly enriched in two pathways, anti-diuretic hormone-regulated reabsorption and bile secretion. Conclusion: These results suggested that Nile tilapia has a highly developed, albeit complex, osmotic pressure regulation system, which provided a molecular basis for exploring how these AQP members coordinate to help Nile tilapia cope with different salinities.
Improving the Microbial Production of Amino Acids: From Conventional Approaches to Recent Trends
Guoqing Zhang,Xueni Ren,Xiuhong Liang,Yaqun Wang,Dexin Feng,Yujun Zhang,Mo Xian,Huibin Zou 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.5
Variable industrial strains have been applied in the fermentation of bulk amino acids. Strain discovery and evolution, process optimization are traditional approaches to improve the yield and efficiency of the bio-production process, hence to compete with chemical or enzymatic process in amino acids production. With the fast development of bioengineering and synthetic biology, the strains can be rationally engineered to achieve better performance and gain the capacity in the fermentation of broader range of amino acids, especially for value-added amino acids. This proposed review aims to summarize traditional and recent strains in the microbial production of amino acids, characterize their metabolic pathways and present potential objectives for rational evolution. In addition, this proposed review prospect the recent opportunities and challenges in the microbial production of value-added amino acids (rare amino acids, non-canonical amino acids, and unnatural amino acids).