Designing and preparing a compatible electromagnetic interference(EMI)shielding,radar and infrared stealth material exhibits significant prospect in the military field.Hence,a novel conductive/magnetic polyimide-based...Designing and preparing a compatible electromagnetic interference(EMI)shielding,radar and infrared stealth material exhibits significant prospect in the military field.Hence,a novel conductive/magnetic polyimide-based nonwoven fabric(PFN_y)is prepared by alkali treatment,Fe~(3+)ion exchange,thermal reduction,and electroless nickel(Ni)plating process.Its impedance/insulation characteristics can be easily adjusted by controlling the in situ growth of Fe_(3)O_(4) and electroless nickel plating.Subsequently,a new strategy of constructing hierarchical dual-gradient impedance/insulation structure is implemented to achieve EMI shielding,radar and infrared stealth via stacking PFN_y with gradually decreased impedance/insulation characteristics from top to bottom.The formation of impedance matching gradient structure promotes effective introduction and dissipation of electromagnetic waves,endowing the composite with outstanding EMI shielding and radar stealth performance.Meanwhile,the construction of thermal insulation gradient structure can effectively inhibit thermal radiation from target,bringing an excellent infrared stealth performance.Importantly,the strong interfacial interactions between Fe_(3)O_(4),Ni and polyimide fiber accelerate PFNy to resist the stresses originated from high-temperature heat source,achieving a compatible high-temperature resistant radar/infrared stealth performance.Such excellent comprehensive properties endow it with a great potential in high-temperature military camouflage applications against enemy radar and infrared detection.展开更多
[Objectives] To explore whether the thin layer chromatography( TLC) can be used to guide the preparation of drug containing serum of eucalyptus oil. [Methods]Eucalyptus oil samples with different dilution ratio were d...[Objectives] To explore whether the thin layer chromatography( TLC) can be used to guide the preparation of drug containing serum of eucalyptus oil. [Methods]Eucalyptus oil samples with different dilution ratio were detected by TLC. Eucalyptus oil was intragastrically administered to mice,serum samples of different eucalyptus oil doses,different intragastric administration methods and different blood sampling times were collected. The above samples were detected by TLC,and the above results were verified by gas chromatography. [Results] TLC can detect concentration difference of eucalyptus oil samples with different dilution ratio. TLC can provide qualitative and semi-quantitative detection of eucalyptus oil in serum. High,medium and low dose of eucalyptus oil in serum had different effects on the growth of MCF-7 cells in the SD rats( P < 0. 05). [Conclusions] TLC can be used to guide the preparation of drug containing serum of eucalyptus oil.展开更多
Plants possess the ability to induce programmed cell death(PCD)in response to abiotic and biotic stresses;nevertheless,the evidence on PCD initiation during pear scald development and the involvement of the scald trig...Plants possess the ability to induce programmed cell death(PCD)in response to abiotic and biotic stresses;nevertheless,the evidence on PCD initiation during pear scald development and the involvement of the scald trigger 6-methyl-5-hepten-2-one(MHO)in this process is rudimentary.Pyrus bretschneideri Rehd.cv.‘Dangshansuli’pear was used to validate such hypothesis.The results showed that superficial scald occurred after 120-d chilling exposure,which accompanied by typical PCD-associated morphological alterations,such as plasmolysis,cell shrinkage,cytosolic and nuclear condensation,vacuolar collapse,tonoplast disruption,subcellular organelle swelling,and DNA fragmentation.These symptoms were aggravated after MHO fumigation but alleviated by diphenylamine(DPA)dipping.Through transcriptome assay,24 out of 146 PCD-related genes,which were transcribed during cold storage,were identified as the key candidate members responsible for these cellular biological alternations upon scald development.Among these,PbrCNGC1,PbrGnai1,PbrACD6,and PbrSOBIR1 were implicated in the MHO signaling pathway.Additionally,PbrWRKY2,34 and 39 could bind to the W-box element in the promoter of PbrGnai1 or PbrSO-BIR1 and activate their transcription,as confirmed by dual-luciferase,yeast one-hybrid,and transient overexpression assays.Hence,our study confirms the PCD initiation during scald development and explores the critical role of MHO in this process.展开更多
基金the financial support from China Postdoctoral Science Foundation(2024M760348)National Natural Science Foundation of China(52373077)。
文摘Designing and preparing a compatible electromagnetic interference(EMI)shielding,radar and infrared stealth material exhibits significant prospect in the military field.Hence,a novel conductive/magnetic polyimide-based nonwoven fabric(PFN_y)is prepared by alkali treatment,Fe~(3+)ion exchange,thermal reduction,and electroless nickel(Ni)plating process.Its impedance/insulation characteristics can be easily adjusted by controlling the in situ growth of Fe_(3)O_(4) and electroless nickel plating.Subsequently,a new strategy of constructing hierarchical dual-gradient impedance/insulation structure is implemented to achieve EMI shielding,radar and infrared stealth via stacking PFN_y with gradually decreased impedance/insulation characteristics from top to bottom.The formation of impedance matching gradient structure promotes effective introduction and dissipation of electromagnetic waves,endowing the composite with outstanding EMI shielding and radar stealth performance.Meanwhile,the construction of thermal insulation gradient structure can effectively inhibit thermal radiation from target,bringing an excellent infrared stealth performance.Importantly,the strong interfacial interactions between Fe_(3)O_(4),Ni and polyimide fiber accelerate PFNy to resist the stresses originated from high-temperature heat source,achieving a compatible high-temperature resistant radar/infrared stealth performance.Such excellent comprehensive properties endow it with a great potential in high-temperature military camouflage applications against enemy radar and infrared detection.
基金Supported by Key Social Research Project of Guizhou Province(Qian Ke He SY[2011]3054)Student Innovation Project of Zunyi Medical University(Zun Yi[2015]5020)State-level College Student Innovation Project(201610661029)
文摘[Objectives] To explore whether the thin layer chromatography( TLC) can be used to guide the preparation of drug containing serum of eucalyptus oil. [Methods]Eucalyptus oil samples with different dilution ratio were detected by TLC. Eucalyptus oil was intragastrically administered to mice,serum samples of different eucalyptus oil doses,different intragastric administration methods and different blood sampling times were collected. The above samples were detected by TLC,and the above results were verified by gas chromatography. [Results] TLC can detect concentration difference of eucalyptus oil samples with different dilution ratio. TLC can provide qualitative and semi-quantitative detection of eucalyptus oil in serum. High,medium and low dose of eucalyptus oil in serum had different effects on the growth of MCF-7 cells in the SD rats( P < 0. 05). [Conclusions] TLC can be used to guide the preparation of drug containing serum of eucalyptus oil.
基金supported by the Shaanxi Province Forestry Science and Technology Innovation Project(SXLK2021-0228)the Shaanxi Province Agricultural Science and Technology Innovation Driven Project(NYKJ-2020-XA-03)+3 种基金the Natural Science Foundation of Guangxi(2022JJA130045)the National Natural Science Foundation of China(32272379,31830081 and 31701868)the Municipal Science and Technology Project(Alar,Xinjiang)in 2022(2022XX5)the Tarim University Principal’s Fund(TDZKB202305).
文摘Plants possess the ability to induce programmed cell death(PCD)in response to abiotic and biotic stresses;nevertheless,the evidence on PCD initiation during pear scald development and the involvement of the scald trigger 6-methyl-5-hepten-2-one(MHO)in this process is rudimentary.Pyrus bretschneideri Rehd.cv.‘Dangshansuli’pear was used to validate such hypothesis.The results showed that superficial scald occurred after 120-d chilling exposure,which accompanied by typical PCD-associated morphological alterations,such as plasmolysis,cell shrinkage,cytosolic and nuclear condensation,vacuolar collapse,tonoplast disruption,subcellular organelle swelling,and DNA fragmentation.These symptoms were aggravated after MHO fumigation but alleviated by diphenylamine(DPA)dipping.Through transcriptome assay,24 out of 146 PCD-related genes,which were transcribed during cold storage,were identified as the key candidate members responsible for these cellular biological alternations upon scald development.Among these,PbrCNGC1,PbrGnai1,PbrACD6,and PbrSOBIR1 were implicated in the MHO signaling pathway.Additionally,PbrWRKY2,34 and 39 could bind to the W-box element in the promoter of PbrGnai1 or PbrSO-BIR1 and activate their transcription,as confirmed by dual-luciferase,yeast one-hybrid,and transient overexpression assays.Hence,our study confirms the PCD initiation during scald development and explores the critical role of MHO in this process.
