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8 results on '"Borui Guo"'

1. Enhancing cold resistance in Banana (Musa spp.) through EMS-induced mutagenesis, L-Hyp pressure selection: phenotypic alterations, biomass composition, and transcriptomic insights

Author

Yumeng Liu, Yujia Li, Anbang Wang, Zhuye Xu, Chunfang Li, Zuo Wang, Borui Guo, Yan Chen, Fenling Tang, and Jingyang Li

Subjects
Bananas, Cold resistance, Somatic mutations, EMS mutagenesis, L-Hyp pressure selection, Transcriptome analysis, Botany, QK1-989
Abstract

Abstract Background The cultivation of bananas encounters substantial obstacles, particularly due to the detrimental effects of cold stress on their growth and productivity. A potential remedy that has gained attention is the utilization of ethyl mesylate (EMS)-induced mutagenesis technology, which enables the creation of a genetically varied group of banana mutants. This complex procedure entails subjecting the mutants to further stress screening utilizing L-Hyp in order to identify those exhibiting improved resistance to cold. This study conducted a comprehensive optimization of the screening conditions for EMS mutagenesis and L-Hyp, resulting in the identification of the mutant cm784, which exhibited remarkable cold resistance. Subsequent investigations further elucidated the physiological and transcriptomic responses of cm784 to low-temperature stress. Results EMS mutagenesis had a substantial effect on banana seedlings, resulting in modifications in shoot and root traits, wherein a majority of seedlings exhibited delayed differentiation and limited elongation. Notably, mutant leaves displayed altered biomass composition, with starch content exhibiting the most pronounced variation. The application of L-Hyp pressure selection aided in the identification of cold-resistant mutants among seedling-lethal phenotypes. The mutant cm784 demonstrated enhanced cold resistance, as evidenced by improved survival rates and reduced symptoms of chilling injury. Physiological analyses demonstrated heightened activities of antioxidant enzymes and increased proline production in cm784 when subjected to cold stress. Transcriptome analysis unveiled 946 genes that were differentially expressed in cm784, with a notable enrichment in categories related to ‘Carbohydrate transport and metabolism’ and ‘Secondary metabolites biosynthesis, transport, and catabolism’. Conclusion The present findings provide insights into the molecular mechanisms that contribute to the heightened cold resistance observed in banana mutants. These mechanisms encompass enhanced carbohydrate metabolism and secondary metabolite biosynthesis, thereby emphasizing the adaptive strategies employed to mitigate the detrimental effects induced by cold stress.

Published
2024
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2. Mechanically strong and multifunctional nano-nickel aerogels based epoxy composites for ultra-high electromagnetic interference shielding and thermal management

Author

Jin Yun, Chiyu Zhou, Borui Guo, Fangping Wang, Yingjie Zhou, Zhonglei Ma, and Jianbin Qin

Subjects
Aerogel, Epoxy, Composites, Electromagnetic interference shielding, Thermal property, Mining engineering. Metallurgy, TN1-997
Abstract

With the development of highly integrated electronic equipment, electromagnetic pollution and heat congregation have become serious problems. Electromagnetic interference (EMI) shielding materials with high thermal conductivity and mechanical properties are highly desirable. Herein, the reduced graphene oxide/Ni nanowire aerogels (GNiA) were firstly prepared via hydrothermal reducing process and freeze-drying. Subsequently, using epoxy (EP) as a polymer matrix, the GNiA/EP composites with high compression strength of 147 MPa were fabricated by vacuum filtration and curing. The GNiA endows the composites with great electromagnetic wave loss, as well as improved phonon propagation efficiency, resulting in the super high EMI SE. With the GNiA content of 12.14 wt%, the EMI SE and thermal conductivity of GNiA/EP composites can reach as high as 85 dB and 1.69 W/(m·K) respectively. The obtained GNiA/EP composites provide a strategy to meet the demand for electronic equipment for new-generation EMI shielding materials.

Published
2023
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5. High-performance electromagnetic interference shielding epoxy/Ag nanowire/thermal annealed graphene aerogel composite with bicontinuous three-dimensional conductive skeleton

Author

Guangcheng Zhang, Fangping Wang, Borui Guo, Ronglin Xiao, Jianbin Qin, Fei Huang, Qiang Gao, Yu Zhang, Xuetao Shi, and Xun Fan

Subjects
Materials science, Graphene, Composite number, Nanowire, Aerogel, Epoxy, law.invention, Mechanics of Materials, law, Electrical resistivity and conductivity, visual_art, Electromagnetic shielding, Ceramics and Composites, visual_art.visual_art_medium, Composite material, Electrical conductor
Abstract

In order to prepare the high-performance electromagnetic interference (EMI) shielding materials to cope with the increasingly serious electromagnetic (EM) radiation pollution situation, in this work, epoxy/Ag nanowire/thermal annealed graphene aerogel composites (EP/AgNW/TAGA) with three-dimensional (3D) bicontinuous conductive skeleton are prepared through a vacuum-assisted impregnation method. By introducing the one-dimensional (1D) AgNW on two-dimensional (2D) graphene and welding the AgNW during hydrothermal reduction and thermal annealing process, the electrical conductivity of EP/AgNW/TAGA are greatly enhanced from 26.5 S/m to the highest value of 595.7 S/m. Besides, the EP/AgNW/TAGA achieve the highest EMI shielding effectiveness (EMI SE) value of 84.01 dB in X-band and absorption-dominate shielding mechanism. Moreover, the compressive strength of composites reached 173.54 MPa, which shows the great application value as high-performance EMI shielding material in fields like construction, aerospace and electronics field.

Published
2021

6. Lightweight and Highly Heat‐Resistant Microcellular Polyetherimide/Barium Titanate/Carbon Nanotube Nanocomposites with High Dielectric Permittivity and Low Dielectric Loss

Author

Xiang Xiaolian, Jing Jiayao, Liang Shao, Borui Guo, Ruochu Jiang, Zhonglei Ma, and Zhang Menghui

Subjects
Heat resistant, Nanocomposite, Materials science, Carbon nanotube, Condensed Matter Physics, Polyetherimide, law.invention, chemistry.chemical_compound, chemistry, law, Barium titanate, General Materials Science, Dielectric loss, Composite material, High dielectric permittivity
Published
2021

7. Response and adaptability of composites composed of the STF-treated Kevlar fabric to temperature

Author

Guangcheng Zhang, Jianbin Qin, Jin Yun, Tianwei Wang, Xuetao Shi, and Borui Guo

Subjects
Dilatant, Work (thermodynamics), Materials science, media_common.quotation_subject, 02 engineering and technology, Kevlar, 021001 nanoscience & nanotechnology, Adaptability, Viscosity, 020303 mechanical engineering & transports, 0203 mechanical engineering, Energy absorbing, Ceramics and Composites, Composite material, 0210 nano-technology, Civil and Structural Engineering, media_common
Abstract

Shear thickening fluid (STF) and STF-treated Kevlar fabric (STKF) has been widely studied to explore its response and adaptability within a wide temperature variation in this work. With decreasing of temperature from 50 °C to −50 °C, the maximum viscosity of the STF was increased from 2.7 × 103 Pa·s to 1.5 × 108 Pa·s and the frictional force between filaments was enhanced significantly. Stab resistant performance of the STKF was strengthened by more than 2 times. In the meanwhile, burst strength of the Kevlar fabric was increased by 5–15 times for the introduction of the STF, and the burst strength and the absorbed energy of the STKF were increased by 25% and 67%, respectively. Response and adaptability of the STKF to cold environment indicated a potential application of the STKF in protective armor designed for cold environment.

Published
2021

8. Soft armor materials constructed with Kevlar fabric and a novel shear thickening fluid

Author

Tianwei Wang, Guangcheng Zhang, Le Zhang, Borui Guo, Xuetao Shi, and Jianbin Qin

Subjects
Dilatant, Materials science, Mechanical Engineering, 02 engineering and technology, Kevlar, Conductivity, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Industrial and Manufacturing Engineering, 0104 chemical sciences, Stab, Rheology, Electrical resistance and conductance, Mechanics of Materials, Ultimate tensile strength, Ceramics and Composites, Composite material, Deformation (engineering), 0210 nano-technology
Abstract

This study presents the dynamic stab resistance and quasi-static mechanical properties of soft armor materials constructed with Kevlar fabric impregnated with a novel shear thickening fluid (STF) composed of silica microsphere and ionic liquids (ILs). Rheological results indicate that this STF presents a unique double continuous shear thickening behavior and good conductivity. Both the stab resistance and mechanical properties of the Kevlar fabric are enhanced significantly due to the presence of the STF. With increasing the addition of STF, the stab resistance of the STF-processed Kevlar fabrics (STKF) is enhanced, and the optimal stab resistance is obtained when the STKF contains 34.89 wt % STF. By comparison with the neat Kevlar fabric, the maximum friction between the yarns in the STKF increases by dozens of times, and the tensile strength of the STKF and yarn increases by approximately 2 times and 1.5 times, respectively. Tensile and pull-out tests demonstrate that both filaments and yarns are restrained for the unique double continuous shear thickening of the STF. Furthermore, the STKF has conductivity and the electrical resistance of it has high sensitivity to the applied deformation. The electromagnetic interference shielding of the STKF was as high as 27 dB. These provide a potential to exploit the novel next generation of soft armor with both excellent protective performance and intelligent wearable property.

Published
2020

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