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Thixotropic composite hydrogels based on agarose and inorganic hybrid gellants 被引量:2
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作者 Hongzhi Zhang huiyan guo +4 位作者 Yang Liu Chengxiang Shi Lun Pan Xiangwen Zhang Ji-Jun Zou 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第2期240-247,共8页
Water can be used as oxidant in conjunction with metal particles to form metal-water propellant to increase the energy of propellant.For this application,water needs to be stored in form of solid and capable of becomi... Water can be used as oxidant in conjunction with metal particles to form metal-water propellant to increase the energy of propellant.For this application,water needs to be stored in form of solid and capable of becoming liquid when use.Stable and thixotropic hydrogel has good potential as water-retaining material and oxidant of metal-based propellant.In this study,we prepared organic/inorganic composite hydrogels by combining inorganic gellants hectorite and fumed silica with organic gellant agarose,respectively.The total content of the gellants can be reduced to less than 2%by adding agarose.The influence of agarose on water content,phase transition temperature,centrifugal stability and other basic physical properties of composite hydrogels were discussed.The results show that the composite hydrogels have better thixotropy and stability than pure inorganic hydrogels,and the gel-sol transformation can be realized by applying shear force or heating to the phase transition temperature.The composite hydrogels have good shear thinning ability and improved mechanical stability.Fumed silica/agarose hydrogels have better physical stability,while the thixotropy and shear thinning ability of hectorite/agarose hydrogels are better. 展开更多
关键词 Composite hydrogels Organic gellant Inorganic gellant Rheological properties
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Expression profiles of genes regulated by BplMYB46 in Betula platyphylla
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作者 huiyan guo Chunrui Zhang +4 位作者 Yanmin Wang Yiming Zhang Yu Zhang Yucheng Wang Chao Wang 《Journal of Forestry Research》 SCIE CAS CSCD 2019年第6期2267-2276,共10页
The transcription factor BplMYB46 has been identified as a regulator of abiotic stress responses and promoter of secondary wall deposition in Betula platyphylla.To investigate the downstream targets of BplMYB46,the ex... The transcription factor BplMYB46 has been identified as a regulator of abiotic stress responses and promoter of secondary wall deposition in Betula platyphylla.To investigate the downstream targets of BplMYB46,the expression profiles of genes in stems from BplMYB46-overexpressing(OE)and BplMYB46-silencing(SE)plants were studied.In OE stems,952 genes were upregulated,and 1469 were downregulated in comparison to SE stems.In a KEGG pathway enrichment analysis of differentially expressed genes(DEGs),1387 differentially expressed genes were annotated for 117 metabolic pathways.DEGs were abundant for metabolic pathway,secondary metabolite biosynthesis,plant hormone signal transduction,phenylpropanoid and flavonoid biosynthesis.DEGs were implicated lignin or cellulose biosynthesis,cell wall modification,xylem development,disease resistance,stress responses,and anthocyanin biosynthesis.These results suggested that BplMYB46 regulates cell wall development and stress resistance by affecting the expression of these genes.Our study further elucidates the mechanism by which BplMYB46 mediates abiotic stress responses and secondary cell wall biosynthesis in birch. 展开更多
关键词 BETULA platyphylla BplMYB46 The GENE EXPRESSION profiles DIFFERENTIALLY EXPRESSED GENES
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Micro-nanoarchitectonic of aluminum-hydrogel propellant with static stability and dynamic rheology
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作者 huiyan guo Huaiyu Li +5 位作者 Hongzhi Zhang Lun Pan Chengxiang Shi Kang Xue Xiangwen Zhang Ji-Jun Zou 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2024年第4期87-96,共10页
The aluminum-water system is a promising propellant due to high energy and low signal characteristics,and the gel form is easier to store and utilize.In this work,hydrogels of water and aluminum particles were prepare... The aluminum-water system is a promising propellant due to high energy and low signal characteristics,and the gel form is easier to store and utilize.In this work,hydrogels of water and aluminum particles were prepared using the low-molecular-weight gellant agarose.The various physical properties of gel systems,including the water loss rate,phase transition temperature,and centrifugal stability at different gellant and aluminum contents,were examined.Rheological properties were assessed through shear thinning tests,thixotropy tests,strain sweep analysis,and frequency sweep experiments.The microstructure of the gel was obtained through scanning electron microscopy images.The results show that the aluminum-hydrogel network structure is composed of micron-scale aluminum and agarose nanosheets,and the unique micro-nanostructure endows the gel with excellent mechanical strength and thermal stability,which improve with increasing gellant and aluminum contents.Notably,the gel with 2% agarose and 20% aluminum had the best performance;the storage modulus reached 90647 Pa,which was within the linear viscoelastic region,and the maximum withstand pressure was 111.2 kPa,which was 118.8% greater than that of the pure hydrogel.Additionally,the gel demonstrates remarkable shear thinning behavior and can undergo gel-sol transformation upon shearing or heating to exceeding 114℃. 展开更多
关键词 aluminum-water propellant gelled propellant rheological property mechanical strength
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Identification of novel cis-elements bound by BplMYB46 involved in abiotic stress responses and secondary wall deposition 被引量:7
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作者 huiyan guo Liuqiang Wang +3 位作者 Chuanping Yang Yiming Zhang Chunrui Zhang Chao Wang 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2018年第10期1000-1014,共15页
Transcription factors (TFs) play vital roles in various biological processes by binding to cis-acting elements to control expressions of their target genes. The MYB TF BplMYB46, from Betula platyphylla, is involved ... Transcription factors (TFs) play vital roles in various biological processes by binding to cis-acting elements to control expressions of their target genes. The MYB TF BplMYB46, from Betula platyphylla, is involved in abiotic stress responses and secondary wall deposition. In the present study, we used a TF-centered yeast onehybrid technology (TF-centered YIH) to identify the cis- acting elements bound by BplMYB46. We screened a shortinsert random library and identified three cis-elements bound by BplMYB46: an E-box (CA(A/T/C)(A/G/C)TG) and two novel motifs, a TO-box (T(GIA)TCG(C/G)) and a GT-box (A(G/T)T(AIC)GT(T/G)C). Chromatin immunoprecipitation (CHIP) and effector-reporter coexpression assays inNicotiana tabacum confirmed binding of BplMYB46 to the TC-box, GT-box, and E-box motifs in the promoters of the phenylalanine ammonia lyase (PAL), peroxidase (POD), and superoxide dismutase (SOD) genes, which function in abiotic stress tolerance and secondary wall biosynthesis. This finding improves our understanding of potential regulatory mechanisms in the response to abiotic stress and secondary wall deposition of BplMYB46 in B. platyphylla. 展开更多
关键词 POD SOD Identification of novel cis-elements bound by BplMYB46 involved in abiotic stress responses and secondary wall deposition cis TCG GUS Figure
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