The development of stimuli-responsive circularly polarized luminescence(CPL)materials is quite attractive but challenging.Here,a pair of atomically precise enan-tiomers R/S-Ag20 nanoclusters has been synthesized using...The development of stimuli-responsive circularly polarized luminescence(CPL)materials is quite attractive but challenging.Here,a pair of atomically precise enan-tiomers R/S-Ag20 nanoclusters has been synthesized using chiral acid ligands.And then,stimuli-responsive CPL materials were developed by assembling the chiral silver nanoclusters with an achiral bridging ligand.The atomically precise silver cluster-assembled materials produce CPL with a dissymmetry factor(|glum|)of 1×10-3,through the high-efficiency chiral induction process.More interestingly,the single CPL band at room temperature could quickly transform into highly separated dual CPL emissions at low temperature.This study provides a new strategy for the rational functionalization of chiral silver clusters in preparing cluster-based CPL emitters and enriches the types of stimuli-responsive CPL materials.展开更多
In the past 37 years,human immunodeficiency virus/acquired immunodeficiency syndrome(HIV/AIDS)has undergone various major transmission routes in China,with the world most complex co-circulating HIV-1 subtypes,even the...In the past 37 years,human immunodeficiency virus/acquired immunodeficiency syndrome(HIV/AIDS)has undergone various major transmission routes in China,with the world most complex co-circulating HIV-1 subtypes,even the prevalence is still low.In response to the first epidemic outbreak of HIV in injecting drug users and the second one by illegal commercial blood collection,China issued the Anti-Drug Law and launched the Blood Donation Act and nationwide nucleic acid testing,which has avoided 98,232 to 211,200 estimated infections and almost ended the blood product-related infection.China has been providing free antiretroviral therapy(ART)since 2003,which covered>80%of the identified patients and achieved a viral suppression rate of 91%.To bend the curve of increasing the disease burden of HIV and finally end the epidemic,China should consider constraining HIV spread through sexual transmission,narrowing the gaps in identifying HIV cases,and the long-term effectiveness and safety of ART in the future.展开更多
The development of circularly polarized luminescence(CPL)switches is of great importance but challenging.Herein,a charge donor/acceptor pair comprising two chiral gold(I)-isocyanide complexes was designed to construct...The development of circularly polarized luminescence(CPL)switches is of great importance but challenging.Herein,a charge donor/acceptor pair comprising two chiral gold(I)-isocyanide complexes was designed to construct light-harvesting system via intermolecular charge-transfer(CT)interactions.By doping nonemissive S-Au I into blue-emitting S-AuCN,(S-Au CN)_(1-x)(S-AuI)_(x)(0≤x≤3.4%)with tunable emission from blue to red was achieved.This large red-shifted emission was realized based on the remarkable change of the electronic properties between the S-Au CN dimer and red-emitting(S-A CN)-(S-AuI)CT pair,and the resulting energy-transfer(En T)process between them.Importantly,the En T process can be switched off/on by external stimuli of grinding and CH_(2)Cl_(2)fuming,giving rise to high-contrast(blue versus red)CPL switching properties.This study opens a novel avenue for developing CPL switches by constructing light-harvesting CT-doped systems based on chiral organometallic complexes.展开更多
The thermal insulation performance of riser is very important to the shrinkage porosity and solidification structure of ingot,but it is difficult to significantly improve due to the limit of thermal conductivity of ri...The thermal insulation performance of riser is very important to the shrinkage porosity and solidification structure of ingot,but it is difficult to significantly improve due to the limit of thermal conductivity of riser material.A new type of hollow insulation riser was proposed based on the low thermal conductivity of air,which aims to improve the thermal insulation performance of riser.A 14.5-t steel ingot was prepared using the hollow insulation riser,and the casting temperature was 1500°C.The temperature evolution of the external surface of mold during solidification was measured using an infrared temperature instrument.A numerical model was established to simulate the porosity and solidification structure of ingot.The reliability of numerical simulation was verified by comparing simulation and experimental results.Results show that the insulation performance of the riser can be significantly improved through application of the hollow insulation sleeve.Compared with solid insulation sleeve,the shrinkage cavity depth was decreased and the position of porosity was raised when hollow insulation riser was applied.展开更多
The complex and efficient sex pheromone communication system in insects is essential for reproduction and for reproductive isolation of species.In moths,sex pheromone communication starts with male attraction to compo...The complex and efficient sex pheromone communication system in insects is essential for reproduction and for reproductive isolation of species.In moths,sex pheromone communication starts with male attraction to compounds emitted by females;only a few species act in the reverse.However,how the pheromones that are emitted by both sexes co-regulate and coordinate mate finding and mating remains unknown.Here,we identified both the male and female pheromones of Eastern Grass Veneer moth,Agriphila aeneociliella(Lepidoptera:Crambidae),and demonstrated their efficiency in manipulating behavioral responses of the opposite sex.Combining data from analysis of gas chromatography-electroantennogram detection,gas chromatography-mass spectrometry,and olfactory behavior assays,the female pheromone of A.aeneociliella was identified as(Z,Z,Z)-9,12,15-octadecatrienal and(Z)-9-hexadecenyl acetate,while the male pheromone was determined to be 1-nonanal.Both the 2 individual components of the female pheromone and their binary mixture were significantly attractive to males,and the 1-nonanal male pheromone induced strong electrophysiological responses in females and induced attraction of females in a Y-tube olfactory test.Depending on the concentration of 1-nonanal,its addition to the binary mixture of the female pheromone either enhanced(10^(−3) or 10^(−2)μg/μL)or reduced(1μg/μL)the aphrodisiac effect of the mixture on males.In wind-tunnel bioassays,different concentrations of pheromones,including the binary mixture of female pheromone and the mixture of male and female pheromones,had significant effects on male behavior.Our findings suggested that the blend of both female and male pheromones plays a significant role in the sexual communication system in some moths.展开更多
基金National Natural Science Foundation of China,Grant/Award Number:92061201 U21A20277Thousand Talents(Zhongyuan Scholars)Program of Henan Province,Grant/Award Number:234000510007Excellent Youth Foundation of Henan Scientific Committee,Grant/Award Number:232300421022。
文摘The development of stimuli-responsive circularly polarized luminescence(CPL)materials is quite attractive but challenging.Here,a pair of atomically precise enan-tiomers R/S-Ag20 nanoclusters has been synthesized using chiral acid ligands.And then,stimuli-responsive CPL materials were developed by assembling the chiral silver nanoclusters with an achiral bridging ligand.The atomically precise silver cluster-assembled materials produce CPL with a dissymmetry factor(|glum|)of 1×10-3,through the high-efficiency chiral induction process.More interestingly,the single CPL band at room temperature could quickly transform into highly separated dual CPL emissions at low temperature.This study provides a new strategy for the rational functionalization of chiral silver clusters in preparing cluster-based CPL emitters and enriches the types of stimuli-responsive CPL materials.
基金the Mega-Projects of national science research(13rd Five-Year Plan[No.2017ZX10201101])the Innovation Team Develop-ment Program of the Ministry of Education 2016(No.IRT_16R70).
文摘In the past 37 years,human immunodeficiency virus/acquired immunodeficiency syndrome(HIV/AIDS)has undergone various major transmission routes in China,with the world most complex co-circulating HIV-1 subtypes,even the prevalence is still low.In response to the first epidemic outbreak of HIV in injecting drug users and the second one by illegal commercial blood collection,China issued the Anti-Drug Law and launched the Blood Donation Act and nationwide nucleic acid testing,which has avoided 98,232 to 211,200 estimated infections and almost ended the blood product-related infection.China has been providing free antiretroviral therapy(ART)since 2003,which covered>80%of the identified patients and achieved a viral suppression rate of 91%.To bend the curve of increasing the disease burden of HIV and finally end the epidemic,China should consider constraining HIV spread through sexual transmission,narrowing the gaps in identifying HIV cases,and the long-term effectiveness and safety of ART in the future.
基金supported by the National Key Research and Development Program of China(2021YFA1200301)the National Natural Science Foundation of China(92061201,21825106,22105177)+1 种基金the China Postdoctoral Science Foundation(2021TQ0294)Zhengzhou University
文摘The development of circularly polarized luminescence(CPL)switches is of great importance but challenging.Herein,a charge donor/acceptor pair comprising two chiral gold(I)-isocyanide complexes was designed to construct light-harvesting system via intermolecular charge-transfer(CT)interactions.By doping nonemissive S-Au I into blue-emitting S-AuCN,(S-Au CN)_(1-x)(S-AuI)_(x)(0≤x≤3.4%)with tunable emission from blue to red was achieved.This large red-shifted emission was realized based on the remarkable change of the electronic properties between the S-Au CN dimer and red-emitting(S-A CN)-(S-AuI)CT pair,and the resulting energy-transfer(En T)process between them.Importantly,the En T process can be switched off/on by external stimuli of grinding and CH_(2)Cl_(2)fuming,giving rise to high-contrast(blue versus red)CPL switching properties.This study opens a novel avenue for developing CPL switches by constructing light-harvesting CT-doped systems based on chiral organometallic complexes.
基金The authors are grateful for the financial support from State Key Laboratory of Metal Material for Marine Equipment and Application(Grant No.SKLMEA-USTL-201705)the National Natural Science Foundation of China(Grant No.51974153).
文摘The thermal insulation performance of riser is very important to the shrinkage porosity and solidification structure of ingot,but it is difficult to significantly improve due to the limit of thermal conductivity of riser material.A new type of hollow insulation riser was proposed based on the low thermal conductivity of air,which aims to improve the thermal insulation performance of riser.A 14.5-t steel ingot was prepared using the hollow insulation riser,and the casting temperature was 1500°C.The temperature evolution of the external surface of mold during solidification was measured using an infrared temperature instrument.A numerical model was established to simulate the porosity and solidification structure of ingot.The reliability of numerical simulation was verified by comparing simulation and experimental results.Results show that the insulation performance of the riser can be significantly improved through application of the hollow insulation sleeve.Compared with solid insulation sleeve,the shrinkage cavity depth was decreased and the position of porosity was raised when hollow insulation riser was applied.
基金supported by grants from the Natural Science Foundation of Shandong Province(ZR2020MC121)the National Key R&D Program of China(2017YFD0201705).
文摘The complex and efficient sex pheromone communication system in insects is essential for reproduction and for reproductive isolation of species.In moths,sex pheromone communication starts with male attraction to compounds emitted by females;only a few species act in the reverse.However,how the pheromones that are emitted by both sexes co-regulate and coordinate mate finding and mating remains unknown.Here,we identified both the male and female pheromones of Eastern Grass Veneer moth,Agriphila aeneociliella(Lepidoptera:Crambidae),and demonstrated their efficiency in manipulating behavioral responses of the opposite sex.Combining data from analysis of gas chromatography-electroantennogram detection,gas chromatography-mass spectrometry,and olfactory behavior assays,the female pheromone of A.aeneociliella was identified as(Z,Z,Z)-9,12,15-octadecatrienal and(Z)-9-hexadecenyl acetate,while the male pheromone was determined to be 1-nonanal.Both the 2 individual components of the female pheromone and their binary mixture were significantly attractive to males,and the 1-nonanal male pheromone induced strong electrophysiological responses in females and induced attraction of females in a Y-tube olfactory test.Depending on the concentration of 1-nonanal,its addition to the binary mixture of the female pheromone either enhanced(10^(−3) or 10^(−2)μg/μL)or reduced(1μg/μL)the aphrodisiac effect of the mixture on males.In wind-tunnel bioassays,different concentrations of pheromones,including the binary mixture of female pheromone and the mixture of male and female pheromones,had significant effects on male behavior.Our findings suggested that the blend of both female and male pheromones plays a significant role in the sexual communication system in some moths.
