Stab resistance body armor（SRBA）is essential in protecting people from knife injuries.The protective parts of traditional SRBA are made of multi-layered ultra-high molecular weight polyethylene（UHMWPE）,which cause...Stab resistance body armor（SRBA）is essential in protecting people from knife injuries.The protective parts of traditional SRBA are made of multi-layered ultra-high molecular weight polyethylene（UHMWPE）,which causes heavy heat stress for people wearing it.The protective parts of SRBA manufactured using laser sintering（LS）3D printing technology provide high manufacturing flexibility and low weight.Two different structures,plain plate and pyramid-structured plate,were investigated.The pyramid structure showed much higher stab resistance property then the plain plate,because of the angle and thickness effects.This is the first effort applying the LS technology and polyamide（PA）material（PA3200）on SRBA.By applying the pyramid structure on the protective layer of the SRBA,the total weight could reduce 30%-40%.展开更多
[Objectives]To observe the effects of daphnetin on mastitis induced by Staphylococcus aureus in mice.[Methods]18 postpartum ICR female mice were used to establish mastitis animal model,and were randomly divided into t...[Objectives]To observe the effects of daphnetin on mastitis induced by Staphylococcus aureus in mice.[Methods]18 postpartum ICR female mice were used to establish mastitis animal model,and were randomly divided into three groups(A,B,and C)with 6 mice in each group.Group A:blank control group;group B:S.Aureus model group;group C:S.Aureus model+daphnetin group.The experimental groups were injected 1 mL of 1.0×104 CFU/100μL of S.aureus of along the nipple catheter.The suspension was placed in the 3 rd and 4 th pairs of mammary glands,and the control group was injected with the same dose of normal saline.On the second day after infection,the rats in group A,B and C were given drugs by gavage,while the rats in group A and B were given normal saline and the rats in group C were given daphnetin once a day for 6 consecutive days.Blood samples were collected from living eyeballs,and blood cells were analyzed by automatic flow cytometer after anticoagulation.[Results]The NLR and Systemie Immune Inflammati-on Index(SII)in the blood of mastitis mice induced by S.aureus were significantly higher than those in the control group(P<0.01),suggesting that neutrophil to lymphocyte ratio(NLR)and SII can be used as diagnostic indicators of mastitis,and the levels of NLR and SII decreased significantly after daphnetin intervention.[Conclusions]NLR and SII showed high levels in mastitis mice,which are valuable for the diagnosis of mastitis and the evaluation of its prognosis.After the intervention of daphnetin,both of them decreased significantly,indicating that daphnetin has a good prognosis trend in mastitis mice induced by S.aureus.展开更多
Aquatic plants develop strong fragment propagation and colonization ability to endure the natural disturbances. However, detailed research of ability to endure the natural disturbances has been lacking to date. Theref...Aquatic plants develop strong fragment propagation and colonization ability to endure the natural disturbances. However, detailed research of ability to endure the natural disturbances has been lacking to date. Therefore, reproduction （shoot） and colonization （root） of shoot fragments of Potamogeton crispus L. with or without apices were investigated for the effect of apical dominance, and the growth of decapitated shoot fragments at three lengths （2, 4, 6 cm） was compared. Meanwhile, fragment propagation at levels of bud position was studied for bud position effect after escaping from apical dominance. The results showed significant increases occurred in the outgrowth of lateral branches on fragments decapitated compared with the fragments with apices, implying that apical dominance exists. Different lengths of fragments showed little difference in biomass allocations, but significant differences were noted in their propagation. Meanwhile, the effect of bud position was verified, due to the significant difference of average reproduction per node among the three length groups. Thus, the present study has made progress in the current understanding of aquatic plant dispersion among natural systems and contributes to improve methods of in vitro propagation for re-implantation purposes.展开更多
A chemical reaction that drives a physical polymer selfassembly process,namely,polymerization-induced self-assembly(PISA),combines block copolymer synthesis and nanoparticle formation efficiently at high polymer conce...A chemical reaction that drives a physical polymer selfassembly process,namely,polymerization-induced self-assembly(PISA),combines block copolymer synthesis and nanoparticle formation efficiently at high polymer concentrations.Various nanoparticlemorphologies such as spheres,worms,and vesicles can be prepared readily in polar and nonpolarmedia.PISA has been well developed in combination with reversible addition-fragmentation chain transfer(RAFT)polymerization.Notably,developments with other polymerization methods are also achieved.In this report,first,we discuss the general principles of RAFT-PISA and the nanoparticles generated from this method.Specifically,new insights into polymer nucleation and subsequent morphological evolution are highlighted.Subsequently,PISA formulations that use other polymerization methods[atom transfer radical polymerization(ATRP),nitroxide-mediated polymerization(NMP),ring-opening metathesis polymerization(ROMP),and ring-opening polymerization(ROP)of N-carboxyanhydrides(NCAs)]are summarized in detail.Finally,more exotic PISA formulations are emphasized:these are based on organotelluriummediated living radical polymerization(TERP),living anionic polymerization(LAP),addition-fragmentation chain transfer(AFCT)polymerization,reversible complexation-mediated polymerization(RCMP),and cobalt-mediated radical polymerization(CMRP),or utilize a comonomer that undergoes radical ringopening polymerization(rROP).This reviewis concluded with a perspective on the status and potential of PISA.展开更多
What is the most favorite and original chemistry developed in your research group?Ring-opening polymerization-induced self-assembly of N-carboxyanhydrides(NCA-PISA),and fusion-induced particle assembly(FIPA).How do yo...What is the most favorite and original chemistry developed in your research group?Ring-opening polymerization-induced self-assembly of N-carboxyanhydrides(NCA-PISA),and fusion-induced particle assembly(FIPA).How do you get into this specific field?Could you please share some experiences with our readers?NCA-PISA was developed to solve the biodegradability problem of nanoparticles by traditional PISA,while FIPA was inspired by nature.展开更多
Due to their excellent stability and layer-dependent photoelectronic properties,transition metal dichalcogenides(TMDs)are one of the most extensively studied two-dimensional semiconductor materials in the postgraphene...Due to their excellent stability and layer-dependent photoelectronic properties,transition metal dichalcogenides(TMDs)are one of the most extensively studied two-dimensional semiconductor materials in the postgraphene era.However,its low luminescence quantum yield limits its application in displays,lighting,and imaging.Here,a 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile(HATCN)layer was grown on the surface of chemical vapor deposition(CVD)-grown monolayer molybdenum disulfide(MoS_(2))by vacuum evaporation,which increased the photoluminescence intensity of MoS_(2)by 15 times.The enhanced luminescence originates from the charge transfer from the conduction band of MoS_(2)to the lowest unoccupied molecular orbital(LUMO)of HATCN,which suppresses the emission of the negatively charged exciton(trion)while increasing the emission of the neutral exciton.Temperature-dependent fluorescence and Raman spectra demonstrate the feasibility of organic−inorganic hybrid heterojunctions for regulating excitons.This facile and practical organic−inorganic hybrid heterojunction can elevate TMD applications,such as light-emitting diodes.展开更多
基金Supported by the Independent Research Project of State Key Laboratory of Explosion Science and Technology(YBKT16-13)Beijing Institute of Technology Research Fund Program for Young Scholars(2-205205-2014)National Key Rsearch Program(2016YFC0802801-4)
文摘Stab resistance body armor（SRBA）is essential in protecting people from knife injuries.The protective parts of traditional SRBA are made of multi-layered ultra-high molecular weight polyethylene（UHMWPE）,which causes heavy heat stress for people wearing it.The protective parts of SRBA manufactured using laser sintering（LS）3D printing technology provide high manufacturing flexibility and low weight.Two different structures,plain plate and pyramid-structured plate,were investigated.The pyramid structure showed much higher stab resistance property then the plain plate,because of the angle and thickness effects.This is the first effort applying the LS technology and polyamide（PA）material（PA3200）on SRBA.By applying the pyramid structure on the protective layer of the SRBA,the total weight could reduce 30%-40%.
基金Supported by Project of Innovation and Entrepreneurship Training Program for College Students in Guangxi Zhuang Autonomous Region in 2022(S202210599060)Basic Ability Improvement Project for Young and Middle-aged Teachers in Guangxi Zhuang Autonomous Region in 2020(2020KY13027)Project of Scientific Research and Technological Development Plan of Baise City in 2020(Encyclopedia[2020]No.47).
文摘[Objectives]To observe the effects of daphnetin on mastitis induced by Staphylococcus aureus in mice.[Methods]18 postpartum ICR female mice were used to establish mastitis animal model,and were randomly divided into three groups(A,B,and C)with 6 mice in each group.Group A:blank control group;group B:S.Aureus model group;group C:S.Aureus model+daphnetin group.The experimental groups were injected 1 mL of 1.0×104 CFU/100μL of S.aureus of along the nipple catheter.The suspension was placed in the 3 rd and 4 th pairs of mammary glands,and the control group was injected with the same dose of normal saline.On the second day after infection,the rats in group A,B and C were given drugs by gavage,while the rats in group A and B were given normal saline and the rats in group C were given daphnetin once a day for 6 consecutive days.Blood samples were collected from living eyeballs,and blood cells were analyzed by automatic flow cytometer after anticoagulation.[Results]The NLR and Systemie Immune Inflammati-on Index(SII)in the blood of mastitis mice induced by S.aureus were significantly higher than those in the control group(P<0.01),suggesting that neutrophil to lymphocyte ratio(NLR)and SII can be used as diagnostic indicators of mastitis,and the levels of NLR and SII decreased significantly after daphnetin intervention.[Conclusions]NLR and SII showed high levels in mastitis mice,which are valuable for the diagnosis of mastitis and the evaluation of its prognosis.After the intervention of daphnetin,both of them decreased significantly,indicating that daphnetin has a good prognosis trend in mastitis mice induced by S.aureus.
基金the Foundation of National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics(Grant No.61422202105)Qing Lan Project and the National Natural Science Foundation of China(Grant No.51775270).
基金Supported by the Hi-Tech Research and Development (863) Program of China (2003AA06011000-04 and 2002AA601012-06).
文摘Aquatic plants develop strong fragment propagation and colonization ability to endure the natural disturbances. However, detailed research of ability to endure the natural disturbances has been lacking to date. Therefore, reproduction （shoot） and colonization （root） of shoot fragments of Potamogeton crispus L. with or without apices were investigated for the effect of apical dominance, and the growth of decapitated shoot fragments at three lengths （2, 4, 6 cm） was compared. Meanwhile, fragment propagation at levels of bud position was studied for bud position effect after escaping from apical dominance. The results showed significant increases occurred in the outgrowth of lateral branches on fragments decapitated compared with the fragments with apices, implying that apical dominance exists. Different lengths of fragments showed little difference in biomass allocations, but significant differences were noted in their propagation. Meanwhile, the effect of bud position was verified, due to the significant difference of average reproduction per node among the three length groups. Thus, the present study has made progress in the current understanding of aquatic plant dispersion among natural systems and contributes to improve methods of in vitro propagation for re-implantation purposes.
基金This work was funded by the National Natural Science Foundation(NSFC)of China(grant no.21925505 and 21674081)the China Postdoctoral Science Foundation(grant no.2020M671197).
文摘A chemical reaction that drives a physical polymer selfassembly process,namely,polymerization-induced self-assembly(PISA),combines block copolymer synthesis and nanoparticle formation efficiently at high polymer concentrations.Various nanoparticlemorphologies such as spheres,worms,and vesicles can be prepared readily in polar and nonpolarmedia.PISA has been well developed in combination with reversible addition-fragmentation chain transfer(RAFT)polymerization.Notably,developments with other polymerization methods are also achieved.In this report,first,we discuss the general principles of RAFT-PISA and the nanoparticles generated from this method.Specifically,new insights into polymer nucleation and subsequent morphological evolution are highlighted.Subsequently,PISA formulations that use other polymerization methods[atom transfer radical polymerization(ATRP),nitroxide-mediated polymerization(NMP),ring-opening metathesis polymerization(ROMP),and ring-opening polymerization(ROP)of N-carboxyanhydrides(NCAs)]are summarized in detail.Finally,more exotic PISA formulations are emphasized:these are based on organotelluriummediated living radical polymerization(TERP),living anionic polymerization(LAP),addition-fragmentation chain transfer(AFCT)polymerization,reversible complexation-mediated polymerization(RCMP),and cobalt-mediated radical polymerization(CMRP),or utilize a comonomer that undergoes radical ringopening polymerization(rROP).This reviewis concluded with a perspective on the status and potential of PISA.
基金This work was supported by the National Natural Science Foundation of China(Nos.21925505,52003195,and 22101207)Shanghai International Scientific Collaboration Fund(No.21520710100)+1 种基金the China Postdoctoral Science Foundation(Nos.2019M661614 and 2020M671197)J.D.is a recipient of the National Science Fund for Distinguished Young Scholars.
文摘What is the most favorite and original chemistry developed in your research group?Ring-opening polymerization-induced self-assembly of N-carboxyanhydrides(NCA-PISA),and fusion-induced particle assembly(FIPA).How do you get into this specific field?Could you please share some experiences with our readers?NCA-PISA was developed to solve the biodegradability problem of nanoparticles by traditional PISA,while FIPA was inspired by nature.
基金the National Natural Science Foundation of China(21788102),the Research Grants Council of Hong Kong(16305320 and C6014-20W)the Shenzhen Key Laboratory of Functional Aggregate Materials(ZDSYS20211021111400001)+1 种基金the Science Technology Innovation Commission of Shenzhen Municipality(KQTD20210811090142053,GJHZ20210705141810031,and GJHZ20210705143204013)the Innovation and Technology Commission(ITC-CNERC14SC01).
文摘Due to their excellent stability and layer-dependent photoelectronic properties,transition metal dichalcogenides(TMDs)are one of the most extensively studied two-dimensional semiconductor materials in the postgraphene era.However,its low luminescence quantum yield limits its application in displays,lighting,and imaging.Here,a 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile(HATCN)layer was grown on the surface of chemical vapor deposition(CVD)-grown monolayer molybdenum disulfide(MoS_(2))by vacuum evaporation,which increased the photoluminescence intensity of MoS_(2)by 15 times.The enhanced luminescence originates from the charge transfer from the conduction band of MoS_(2)to the lowest unoccupied molecular orbital(LUMO)of HATCN,which suppresses the emission of the negatively charged exciton(trion)while increasing the emission of the neutral exciton.Temperature-dependent fluorescence and Raman spectra demonstrate the feasibility of organic−inorganic hybrid heterojunctions for regulating excitons.This facile and practical organic−inorganic hybrid heterojunction can elevate TMD applications,such as light-emitting diodes.
