对 T700/TDE86 碳纤维增强树脂基复合材料进行加速循环湿热老化实验,研究不同循环湿热老化天数对Ⅰ型张开以及Ⅱ型滑移两种层间断裂韧度的影响。结果表明:循环湿热老化之后的复合材料Ⅰ型层间断裂韧度出现明显的 R 曲线,且随着循环湿热...对 T700/TDE86 碳纤维增强树脂基复合材料进行加速循环湿热老化实验,研究不同循环湿热老化天数对Ⅰ型张开以及Ⅱ型滑移两种层间断裂韧度的影响。结果表明:循环湿热老化之后的复合材料Ⅰ型层间断裂韧度出现明显的 R 曲线,且随着循环湿热老化天数的增加,裂纹初始扩展能量释放率(GIC,init)与裂纹稳态扩展能量释放率(GIC,prop)都获得了大幅提升;复合材料Ⅱ型层间断裂韧度随着循环湿热老化天数的增加,呈现阶梯状下降的趋势,而且在循环湿热老化前期,下降幅度最大,为 21.68%。展开更多
Supramolecular systems feature dynamic,reversible and stimuli-responsive characteristics,which are not easily achieved by molecular entities.The last decade has witnessed tremendous advances in the investigations of s...Supramolecular systems feature dynamic,reversible and stimuli-responsive characteristics,which are not easily achieved by molecular entities.The last decade has witnessed tremendous advances in the investigations of supramolecular systems for various bioapplications,which include drug delivery,anticancer therapy,antibacterial therapy,photodynamic therapy,photothermal therapy,combination therapy,antidotes for residual drugs or toxins,and bioimaging and biosensing.Host-guest chemistry has played a key role in the development of such bioactive supramolecular systems,and natural macrocycles(such as cyclodextrins),synthetic macrocycles(such as calixarenes,cucurbit[n]urils,and pillararenes),and porous framework polymers(such as supramolecular organic frameworks and flexible organic frameworks)have been most successfully used as hosts to build different kinds of host-guest systems for attaining designed biofunctions.The self-assembly of rationally designed amphiphilic molecules,macromolecules and polymers represent another important approach for the construction of supramolecular architectures with advanced biofunctions.In this review,we summarize the important contributions made by Chinese researchers in this field,with emphasis on those reported in the past five years.展开更多
Background Coronovirus disease 2019 (COVID-19) has spread rapidly across the globe.People of all ages are susceptible to COVID-19.However,literature reports on pediatric patients are limited.Methods To improve the rec...Background Coronovirus disease 2019 (COVID-19) has spread rapidly across the globe.People of all ages are susceptible to COVID-19.However,literature reports on pediatric patients are limited.Methods To improve the recognition of COVID-19 infection in children,we retrospectively reviewed two confirmed pediatric cases from two family clusters.Both clinical features and laboratory examination results of the children and their family members were described.Results The two confirmed children only presented with mild respiratory or gastrointestinal symptoms.Both of them had normal chest CT images.After general and symptomatic treatments,both children recovered quickly.Both families had travel histories to Hubei Province.Conclusions Pediatric patients with COVID-19 are mostly owing to family cluster or with a close contact history.Infected children have relatively milder clinical symptoms than infected adults.We should attach importance to early recognition,early diagnosis,and early treatment of infected children.展开更多
Nano-drug delivery systems with multiple stimulus-responsive capabilities have superior response performance and efficient drug release.Nevertheless,it is sophisticated to construct multiple stimulus-responsive system...Nano-drug delivery systems with multiple stimulus-responsive capabilities have superior response performance and efficient drug release.Nevertheless,it is sophisticated to construct multiple stimulus-responsive systems where the two or more functional groups need to be introduced simultaneously.Xanthate,one functional group with pH and H2O2 stimulus responsiveness,has significant potential applications for building dual-responsive drug delivery system.Herein,we present a novel dual stimuli-responsive supramolecular drug delivery system by using sodium xanthate derivative(SXD)as guest molecule and quaternary ammonium capped pillar[5]arene(QAP5)as host molecule through host-guest interaction on the basis of electrostatic interaction.The amphiphile QAP5⊃SXD could self-assemble into vesicles to efficiently load the anti-cancer drug DOX.The experimental results showed that QAP5⊃SXD nanoparticles could achieve efficient drug delivery and controlled release in the tumor microenvironment.Cytotoxicity experiments proved that DOX@QAP5⊃SXD nanoparticles could significantly improve the anticancer efficiency of free DOX on cancer cells.The present study provides an efficient strategy to develop supramolecular nanocarriers with dual-responsiveness in one functional group for controlled drug release.展开更多
文摘Supramolecular systems feature dynamic,reversible and stimuli-responsive characteristics,which are not easily achieved by molecular entities.The last decade has witnessed tremendous advances in the investigations of supramolecular systems for various bioapplications,which include drug delivery,anticancer therapy,antibacterial therapy,photodynamic therapy,photothermal therapy,combination therapy,antidotes for residual drugs or toxins,and bioimaging and biosensing.Host-guest chemistry has played a key role in the development of such bioactive supramolecular systems,and natural macrocycles(such as cyclodextrins),synthetic macrocycles(such as calixarenes,cucurbit[n]urils,and pillararenes),and porous framework polymers(such as supramolecular organic frameworks and flexible organic frameworks)have been most successfully used as hosts to build different kinds of host-guest systems for attaining designed biofunctions.The self-assembly of rationally designed amphiphilic molecules,macromolecules and polymers represent another important approach for the construction of supramolecular architectures with advanced biofunctions.In this review,we summarize the important contributions made by Chinese researchers in this field,with emphasis on those reported in the past five years.
文摘Background Coronovirus disease 2019 (COVID-19) has spread rapidly across the globe.People of all ages are susceptible to COVID-19.However,literature reports on pediatric patients are limited.Methods To improve the recognition of COVID-19 infection in children,we retrospectively reviewed two confirmed pediatric cases from two family clusters.Both clinical features and laboratory examination results of the children and their family members were described.Results The two confirmed children only presented with mild respiratory or gastrointestinal symptoms.Both of them had normal chest CT images.After general and symptomatic treatments,both children recovered quickly.Both families had travel histories to Hubei Province.Conclusions Pediatric patients with COVID-19 are mostly owing to family cluster or with a close contact history.Infected children have relatively milder clinical symptoms than infected adults.We should attach importance to early recognition,early diagnosis,and early treatment of infected children.
基金supported by the National Natural Science Foundation of China(Nos.21877088.22171230)China Postdoctoral Science Foundation(No.2016M602861).
文摘Nano-drug delivery systems with multiple stimulus-responsive capabilities have superior response performance and efficient drug release.Nevertheless,it is sophisticated to construct multiple stimulus-responsive systems where the two or more functional groups need to be introduced simultaneously.Xanthate,one functional group with pH and H2O2 stimulus responsiveness,has significant potential applications for building dual-responsive drug delivery system.Herein,we present a novel dual stimuli-responsive supramolecular drug delivery system by using sodium xanthate derivative(SXD)as guest molecule and quaternary ammonium capped pillar[5]arene(QAP5)as host molecule through host-guest interaction on the basis of electrostatic interaction.The amphiphile QAP5⊃SXD could self-assemble into vesicles to efficiently load the anti-cancer drug DOX.The experimental results showed that QAP5⊃SXD nanoparticles could achieve efficient drug delivery and controlled release in the tumor microenvironment.Cytotoxicity experiments proved that DOX@QAP5⊃SXD nanoparticles could significantly improve the anticancer efficiency of free DOX on cancer cells.The present study provides an efficient strategy to develop supramolecular nanocarriers with dual-responsiveness in one functional group for controlled drug release.
