The adult subventricular zone of the lateral ventricles and the subgranular zone in the hippocampal dentate gyrus(DG)are the two brain regions where neurogenesis occurs throughout life in the adult mammalian brain(Min...The adult subventricular zone of the lateral ventricles and the subgranular zone in the hippocampal dentate gyrus(DG)are the two brain regions where neurogenesis occurs throughout life in the adult mammalian brain(Ming and Song,2011).Adult quiescent hippocampal neural stem cells(NSCs)are bona fide stem cells and,when activated,give rise to newborn granule neurons in the adult brain,which play vital roles in learning,memory,mood,and affective cognition(Bonaguidi et al.,2011;Ming and Song,2011).展开更多
Currently,zinc anodes are facing problems such as the growth of zinc dendrites and the frequent occurrence of side reactions,while existing additive strategies are still challenging due to the poor stability of the ad...Currently,zinc anodes are facing problems such as the growth of zinc dendrites and the frequent occurrence of side reactions,while existing additive strategies are still challenging due to the poor stability of the adsorption layer and the ambiguous mechanisms of action.In this study,a highly stable Vani molecular brush additive was designed.The additive effectively inhibits H_(2) generation by targeting and anchoring H+in the inner Helmholtz layer,and reduces the water activity by constructing an enhanced hydrogen bonding network through the interaction with water molecules,thus inhibiting the parasitic side reactions on the zinc anode.In addition,the dynamic interfacial molecular layer can regulate and buffer the interfacial Zn^(2+)for highly reversible plating/stripping.Experiments show that the symmetric cell cycle life is as long as 3760 h at a Vani content of only 2×10^(-3) g L^(-1) with a current density of5 mA cm^(-2).The cycle life of the Zn‖MnO_(2) and Zn‖Zn_(0.58)V_(2)O_(5) H_(2)O full battery is significantly improved.This study deepens the understanding of the working mechanism of the zinc electrode interface and provides new ideas for non-sacrififcial trace additive design.展开更多
Integrated water and fertilizer management is important for promoting sustainable development of facility agriculture,and biochar plays an important role in guaranteeing food production,as well as alleviating water sh...Integrated water and fertilizer management is important for promoting sustainable development of facility agriculture,and biochar plays an important role in guaranteeing food production,as well as alleviating water shortages and the overuse of fertilizers.The field experiment had twelve treatments and a control(CK)trial including two irrigation amounts(I1,100%ETm;I2,60%ETm;where ETm is the maximum evapotranspiration),two nitrogen applications(N1,360 kg ha^(−1);N2,120 kg ha^(−1))and three biochar application levels(B1,60 t ha^(−1);B_(2),30 t ha^(−1)and B3,0 t ha^(−1)).A multi-objective synergistic irrigation-nitrogen-biochar application system for improving tomato yield,quality,water and nitrogen use efficiency,and greenhouse emissions was developed by integrating the techniques of experimentation and optimization.First,a coupled irrigation-nitrogen-biochar plot experiment was arranged.Then,tomato yield and fruit quality parameters were determined experimentally to establish the response relationships between irrigation-nitrogen-biochar dosage and yield,comprehensive quality of tomatoes(TCQ),irrigation water use efficiency(IWUE),partial factor productivity of nitrogen(PFPN),and net greenhouse gas emissions(NGE).Finally,a multi-objective dynamic optimization regulation model of irrigation-nitrogen-biochar resource allocation at different growth stages of tomato was constructed which was solved by the fuzzy programming method.The results showed that the application of irrigation and nitrogen to biochar promoted increase in yield,IWUE and PFPN,while it had an inhibitory effect on NGE.In addition,the optimal allocation amounts of water and fertilizer were different under different scenarios.The yield of the S1 scenario increased by 8.31%compared to the B_(1)I_(1)N_(2) treatment;TCQ of the S2 scenario increased by 5.14%compared to the B_(2)I_(2)N_(1) treatment;IWUE of the S3 scenario increased by 10.01%compared to the B1I2N2 treatment;PFPN of the S4 scenario increased by 9.35%compared to the B_(1)I_(1)N_(2) treatment;and NGE of the S5 scenario decreased by 11.23%compared to the B_(2)I1N1 treatment.The optimization model showed that the coordination of multiple objectives considering yield,TCQ,IWUE,PFPN,and NGE increased on average from 4.44 to 69.02%compared to each treatment when the irrigation-nitrogen-biochar dosage was 205.18 mm,186 kg ha^(−1)and 43.31 t ha^(−1),respectively.This study provides a guiding basis for the sustainable management of water and fertilizer in greenhouse tomato production under drip irrigation fertilization conditions.展开更多
Pipeline isolation plugging robot (PIPR) is an important tool in pipeline maintenance operation. During the plugging process, the violent vibration will occur by the flow field, which can cause serious damage to the p...Pipeline isolation plugging robot (PIPR) is an important tool in pipeline maintenance operation. During the plugging process, the violent vibration will occur by the flow field, which can cause serious damage to the pipeline and PIPR. In this paper, we propose a dynamic regulating strategy to reduce the plugging-induced vibration by regulating the spoiler angle and plugging velocity. Firstly, the dynamic plugging simulation and experiment are performed to study the flow field changes during dynamic plugging. And the pressure difference is proposed to evaluate the degree of flow field vibration. Secondly, the mathematical models of pressure difference with plugging states and spoiler angles are established based on the extreme learning machine (ELM) optimized by improved sparrow search algorithm (ISSA). Finally, a modified Q-learning algorithm based on simulated annealing is applied to determine the optimal strategy for the spoiler angle and plugging velocity in real time. The results show that the proposed method can reduce the plugging-induced vibration by 19.9% and 32.7% on average, compared with single-regulating methods. This study can effectively ensure the stability of the plugging process.展开更多
Nowadays,the microgrid cluster is an important application scenario for energy trading.In trading,one of the most important research directions is the issue of pricing.To determine reasonable pricing for the microgrid...Nowadays,the microgrid cluster is an important application scenario for energy trading.In trading,one of the most important research directions is the issue of pricing.To determine reasonable pricing for the microgrid cluster,data communication is used to create the cyber-physical system(CPS),which can improve the observability of microgrids.Then,the following works are carried out in the CPS.In the physical layer:1)Regarding trading between microgrids and the load,based on the generalized game theory,an optimal pricing strategy is proposed,which takes into account the interactive relationships among microgrids and transforms the pricing problem into a Nikaido-Isoda function to obtain the optimal prices conveniently;2)Regarding peer-to-peer trading between two microgrids,based on evolutionary game theory and the penalty mechanism,the optimal sale price of the seller is selected with boundary rationality.In the cyber layer,regarding the communication interruption issue existing in pricing(i.e.,the game process),based on the principle of matching the performance of the path with the importance degree of the data,a dynamic regulating method of paths is proposed,i.e.,adopting a new path to re-transmit the interrupted data to the destination.Finally,the effect of the proposed strategies is verified by case studies.展开更多
Stem cells possess the ability to divide symmetrically or asymmet- rically to allow for maintenance of the stem cell pool or become committed progenitors and differentiate into various cell lineages. The unique self-r...Stem cells possess the ability to divide symmetrically or asymmet- rically to allow for maintenance of the stem cell pool or become committed progenitors and differentiate into various cell lineages. The unique self-renewal capabilities and pluripotency of stem cells are integral to tissue regeneration and repair （Oh et al., 2014）. Mul- tiple mechanisms including intracellular programs and extrinsic cues are reported to regulate neural stem cell （NSC） fate （Bond et al., 2015）. A recent study, published in Cell Stern Cell, identified a novel mechanism whereby mitochondrial dynamics drive NSC fate （Khacho et al., 2016）.展开更多
How to control the dynamic behavior of large-scale artificial active matter is a critical concern in experimental research on soft matter, particularly regarding the emergence of collective behaviors and the formation...How to control the dynamic behavior of large-scale artificial active matter is a critical concern in experimental research on soft matter, particularly regarding the emergence of collective behaviors and the formation of group patterns. Centralized systems excel in precise control over individual behavior within a group, ensuring high accuracy and controllability in task execution. Nevertheless, their sensitivity to group size may limit their adaptability to diverse tasks. In contrast, decentralized systems empower individuals with autonomous decision-making, enhancing adaptability and system robustness. Yet, this flexibility comes at the cost of reduced accuracy and efficiency in task execution. In this work, we present a unique method for regulating the centralized dynamic behavior of self-organizing clusters based on environmental interactions. Within this environment-coupled robot system, each robot possesses similar dynamic characteristics, and their internal programs are entirely identical. However, their behaviors can be guided by the centralized control of the environment, facilitating the accomplishment of diverse cluster tasks. This approach aims to balance the accuracy and flexibility of centralized control with the robustness and task adaptability of decentralized control. The proactive regulation of dynamic behavioral characteristics in active matter groups, demonstrated in this work through environmental interactions, holds the potential to introduce a novel technological approach and provide experimental references for studying the dynamic behavior control of large-scale artificial active matter systems.展开更多
Control strategy affects directly the working performances of dynamic voltage regulator （DVR）. One-cycle control is an effective nonlinear signal modulation control method. In this paper, a new one-cycle control sch...Control strategy affects directly the working performances of dynamic voltage regulator （DVR）. One-cycle control is an effective nonlinear signal modulation control method. In this paper, a new one-cycle control scheme for DVR was proposed in single phase supply system. On the basis of principle analysis, the corresponding one-cycle control model for DVR was built up, which is characterized by simple control circuits, good control performance, and high control precision. As an example, a control model for single-phase DVR was simulated by using Matlab/Simulink and SimPowerSystem. The results show that the load voltage could be compensated quickly at the points of supply voltage stepping down and up, and the relative error was less than 4% in the whole voltage sag process. Both theory analysis and simulation results show that the new one-cycle control scheme for DVR is effective.展开更多
The dynamic regulation of single-molecule magnet(SMM)behavior remains challenging but extremely critical to practical applications.Efficient manipulation of magnetization of complexes via external stimulus,like solven...The dynamic regulation of single-molecule magnet(SMM)behavior remains challenging but extremely critical to practical applications.Efficient manipulation of magnetization of complexes via external stimulus,like solvent,pressure,electric potential or light may further extend the scope of applications for these magnetic molecules.Among these,light is highly desirable because it can provide high-contrast,sensitive and remote control of magnetic behavior at relatively high spatial and temporal resolution.Lanthanide(Ln)complexes represent a distinctive platform for constructing photo-responsive SMMs owing to their extreme sensitivity to subtle change of crystal field(CF)environment.Despite the numerous potential benefits and unique advantages outlined above,light control of magnetism of Ln-SMMs still faces several challenges.This review briefly summarizes recent advancements of photo-responsive Ln-SMMs with photochromic characteristic,highlighting the significance of photoinduced structural changes or electronic distribution alterations to modulate the magnetic properties,which may throw light on the future improvements of photo-responsive molecular materials.展开更多
Chiral metal-organic frameworks(CMOFs),characterized by their enantioselective porous architectures,intrinsic chirality,and precisely ordered active sites,have emerged as a transformative class of materials with appli...Chiral metal-organic frameworks(CMOFs),characterized by their enantioselective porous architectures,intrinsic chirality,and precisely ordered active sites,have emerged as a transformative class of materials with applications spanning asymmetric catalysis,enantiomeric separation,and chiral sensing.In this study,persulfurated arenes,as AIEgens with photoexcitation activity,were used as fluorescent dyes.Usingγ-cyclodextrin as a chiral template,we constructed a photo-responsive CMOF via intermolecular hydrogen bonding.The co-assembly process exhibited remarkable phenomena of chiral amplification and transfer,generating bright yellow fluorescence under mild UV irradiation at 365 nm.Deprotonated persulfurated arenes were used for comparative studies,and the resulting photoresponsive chiral metal-organic frameworks showed signals of reversed peaks at 400 and 460 nm.This study provides a novel construction strategy for chiral metal-organic frameworks featuring dual dynamic regulation mechanisms mediated by hydrogen bonding and photoirradiation.展开更多
Radical-metal compounds used as functional materials can be applied to multiple fields such as solar-thermal conversion and ultra-high density data storage.However,the reactivity and instability of organic radicals us...Radical-metal compounds used as functional materials can be applied to multiple fields such as solar-thermal conversion and ultra-high density data storage.However,the reactivity and instability of organic radicals usually hamper the development and application of radical-metal compounds.Herein,we utilized persistent nitronyl nitroxide to construct two categories of nitronyl nitroxide-Ln compounds,[Gd_(3)(hfac)_(9)(NIT4bpym)_(2)]_(2)·4CH_(2)Cl_(2)·C_(6)H_(14)(1-Gd),[Dy_(3)(hfac)_(9)(NIT4bpym)_(2)](1-Dy)and[Dy_(3)(hfac)_(9)(NITPzCH_(2)IM)_(2)]·2CH_(2)Cl_(2)(2-Dy)(NIT4bpym=2),2′-dipyridyl-4-(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl);NITPzCH_(2)IM=[2-(1-methylimidazole)methyl-1-pyrazol]-4-(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl)(hfac=hexafluoroacetylacetonate),involving a rare[4f-2p-4f-2p-4f]multi-spin motif with an electron donor-acceptor pattern.Notably,thanks to the rigidity modification of nitronyl nitroxide,prominent enhancement of photothermal conversion efficiency from 56.9% to 74.0% and the magnetic switching phenomenon have been observed with molecular structure transformation from flexibility(2-Dy)to stiffness(1-Dy),offering an avenue for the regulation of the photothermal effect and magnetic dynamics.展开更多
L-malic acid is widely used in biomedicine,food chemicals and other fields.The production process of L-malic acid by Escherichia coli suffers from the problems of unconcentrated carbon flow distribution and low CO_(2)...L-malic acid is widely used in biomedicine,food chemicals and other fields.The production process of L-malic acid by Escherichia coli suffers from the problems of unconcentrated carbon flow distribution and low CO_(2) fix-ation efficiency.In our previous research,the high-yielding L-malic acid chassis strain that could utilize the T7 expression system was constructed,with only partially blocked the malate consumption pathway.In this study,the transcriptome analysis to determine the direction of carbon flow allocation was performed firstly.To increase the carbon flux for the conversion of oxaloacetate to L-malic acid,the malate dehydrogenase was expressed in E.coli alone or in combination.A CO_(2) fixation branch was constructed by introducing the ribulose 5-phosphate kinase(PRK)and ribulose 1,5-bisphosphate kinase carboxylase/oxygenase(RuBisCO).Moreover,the dynamic regulatory system was designed that the pyruvate responded to dynamically repress genes on the metabolic pathway and concentrate carbon fluxes to balance in carbon flux distribution while maintaining the normal metabolism in the strain.The metabolic fluxes were directed to the L-malic acid synthesis pathway with the elucidation on the regulatory mechanism of carbon fluxes in this pathway.The engineered strain that dynamically regulated the pykF gene and introduced pET28a-mdh1+mdh2 and pETDuet-prk+RuBisco achieved a glucose consumption of 41.08 g/L,resulting in the highest L-malic acid titer of 23.00 g/L,with an increase of 202% from the starting strain.It demonstrates an effective strategy for the carbon flow allocation in the L-malic acid biosynthesis.展开更多
(+)-Nootkatone,a valuable grapefruit-derived sesquiterpenoid,is targeted for microbial production to address its limited availability.In this study,we reported the highest de novo biosynthesis of(+)-nootkatone in Esch...(+)-Nootkatone,a valuable grapefruit-derived sesquiterpenoid,is targeted for microbial production to address its limited availability.In this study,we reported the highest de novo biosynthesis of(+)-nootkatone in Escherichia coli using stress-response systems for dynamic regulation to overcome challenges associated with metabolic promiscuity.Initial screening farnesyl diphosphate(FPP)synthase and cytochrome P450 led to a chassis strain producing 10.7 mg/L(+)-nootkatone.Implementing an FPP-responsive dynamic regulation system(PgadE and PrstA)increased the titer to 67.0 mg/L by preventing farnesol accumulation.The production was further increased to 128.9 mg/L through PrstA promoter engineering and baffle flasks.Fed-batch strategies ultimately achieved a final titer of 165.1 mg/L,a 15-fold improvement over static regulation.These results establish a platform for(+)-nootkatone biosynthesis in E.coli and highlight the importance of stress-response dynamic regulation for CYP450-mediated terpenoid production,offering a strong foundation for terpene derivative biosynthesis.展开更多
D-allulose,a low-caloric sweetener,represents a promising alternative to sucrose across diverse applications.In contrast to enzymatic production,fermentation-based approaches coupled with metabolic engineering strateg...D-allulose,a low-caloric sweetener,represents a promising alternative to sucrose across diverse applications.In contrast to enzymatic production,fermentation-based approaches coupled with metabolic engineering strategies present a more economically viable and operationally streamlined production route.Nevertheless,traditional regulatory tools,including gene deletion and isopropylβ-D-thiogalactoside(IPTG)-mediated induction,exhibit limitations in achieving precise temporal control over metabolic processes.Herein,two mutually orthogonal optogenetic systems were combined with clustered regularly interspaced short palindromic repeats interference(CRISPRi)technology to enable the spatiotemporal control of cellular behavior and dynamically reallocate metabolic resources.Specifically,the YF1/FixJ and iLight-ho1 systems were employed in the CRISPRi/dCpf1 system,with protein production triggered by blue light and dark conditions,respectively,to redirect metabolic pathways towards D-allulose production,enables precise balancing without the metabolic fragility caused by gene knockout.Consequently,D-allulose production achieved a titer of 5.924 g/L,indicating a 3.26-fold increase compared to the unregulated control,with a productivity of 0.197 g/L/h and an in vitro conversion yield(the intracellular D-allulose to residual D-fructose ratio)of 75.8%.These represented the highest titer,productivity and in vitro conversion yield of D-allulose from D-fructose by fermentation reported to date.The findings validate the dual-opto-CRISPRi system as an efficient metabolic engineering strategy for enhancing product yields,highlighting its potential for broader industrial applications.展开更多
The controlled synthesis and structure determination of two titanium-oxo(Ti-O)clusters(Ti_(10)Cu_(2))sp(sp:hard-sphere-like packing)and(Ti_(10)Cu_(2))cs(cs:chain stacking)are presented.In contrast to the previously re...The controlled synthesis and structure determination of two titanium-oxo(Ti-O)clusters(Ti_(10)Cu_(2))sp(sp:hard-sphere-like packing)and(Ti_(10)Cu_(2))cs(cs:chain stacking)are presented.In contrast to the previously reported assemblies of Ti-O clusters by organic or inorganic linkers,(Ti_(10)Cu_(2))sp and(Ti_(10)Cu_(2))cs are achieved via regulating the surface dynamics of Ti-O clusters and further stabilized by CH…πinteractions.The surface dynamics was regulated via a change of dynamically detached Sal-Cu/OMe-Cu motifs(Sal=salicylic acid).展开更多
Phenolic compounds(PCs)are a group of compounds with various applications in nutraceutical,pharmaceutical and cosmetic industries.Their supply by plant extraction and chemical synthesis is often limited by low yield a...Phenolic compounds(PCs)are a group of compounds with various applications in nutraceutical,pharmaceutical and cosmetic industries.Their supply by plant extraction and chemical synthesis is often limited by low yield and high cost.Microbial production represents as a promising alternative for efficient and sustainable production of PCs.In this review,we summarize recent advances in this field,which include enzyme mining and engineering to construct artificial pathways,balance of enzyme expression to improve pathway efficiency,coculture engineering to alleviate metabolic burden and side-reactions,and the use of genetic circuits for dynamic regulation and high throughput screening.Finally,current challenges and future perspectives for efficient production of PCs are also discussed.展开更多
Camouflage technology has garnered increasing attention for various applications.With the continuous advancement of detection technologies and the increasing variability of camouflage scenarios,the demand for multispe...Camouflage technology has garnered increasing attention for various applications.With the continuous advancement of detection technologies and the increasing variability of camouflage scenarios,the demand for multispectral dynamic camouflage has been steadily growing.In this work,we present a multispectral dynamic regulator based on phase-changing material vanadium dioxide(VO_(2))that can be dynamically and functional-independently regulated for reflective color and thermal radiation.It has been shown that the device can achieve a wide color gamut variation in visible band while simultaneously achieving highest emissivity tunability(Δε=-0.58)in the atmospheric window up to now,achieves multispectral camouflage spanning the visible and infrared spectra among VO_(2)-based devices.To go a step further,we advance the device featuring long-term cycling stability to achieve thermal-electric dual-mode response and flexibility for a series real-world camouflage performance evaluation.We have also demonstrated the digital camouflage based on multispectral dynamic regulator through Neighboring Color Block Camouflage Algorithm,highlighting its potential for practical implementation in different camouflage scenarios.The device achieves multispectral dynamic camouflage,opening a path for advancing the technology development in both the scientific field and practical applications.展开更多
Iontronics presents a transformative paradigm for energy and information processing via ions as active charge carriers.Here,triboiontronics is introduced,a novel strategy leveraging contact electrification to achieve ...Iontronics presents a transformative paradigm for energy and information processing via ions as active charge carriers.Here,triboiontronics is introduced,a novel strategy leveraging contact electrification to achieve dynamic regulation of electrical double layers.Inspired by signaling mechanisms of biological neural systems,triboiontronics enables enhanced ionic-electronic coupling without external power input,offering a material-independent and self-powered pathway for programmable interfacial behavior,underscoring its promise for post-Moore,energy-autonomous information technologies.展开更多
Rice stands as the most significant crop in China,but it frequently encounters diseases that lead to an average yield loss of 10%to 30%[1].Over the past decade,the area affected by rice pests and diseases in China has...Rice stands as the most significant crop in China,but it frequently encounters diseases that lead to an average yield loss of 10%to 30%[1].Over the past decade,the area affected by rice pests and diseases in China has ranged from 18 to 27 million hectares annually,leading to a loss of 1.3 to 2 million tons of rice[2].Identifying genes that confer broad and durable disease resistance,along with elucidating the molecular mechanisms underlying plant immune activation and broad-spectrum resistance regulation,constitutes the fundamental theoretical foundation for breeding disease-resistant crops.展开更多
Asymmetric deformations in soft materials are ubiquitous in nature and play a crucial role in various biological and mechanical processes,yet current fabrication strategies primarily focus on introducing anisotropy wh...Asymmetric deformations in soft materials are ubiquitous in nature and play a crucial role in various biological and mechanical processes,yet current fabrication strategies primarily focus on introducing anisotropy while overlooking the internal transfer of stress,energy,or matter.In this work,we discovered a pattern mapping behavior driven by the selective distribution of photochemical crosslinking regions and the application of external stress fields,resulting in complementary mappable structures on the opposite side of the material.Theoretical simulations and experimental results reveal that the key to pattern mapping lies in the asymmetric deformation along the stretching direction of the material,coupled with the migration of polymer chains within the soft material.Employing complementary stress fields,2D ordered or 3D hierarchical patterns can be precisely mapped onto both sides.Moreover,upon thermal stimulation,the mapped patterns and macroscopic deformations demonstrate outstanding reversibility across multiple cycles.This result reveals mapping behaviors induced by asymmetric deformations and polymer chain migration within soft materials under external stress fields,offering valuable insights for designing structures with interactive functionalities.展开更多
基金supported by National Institutes of Health(R35NS137480,R35NS116843,and RF1AG079557)by Dr.Miriam and Sheldon G.Adelson Medical Research Foundation.
文摘The adult subventricular zone of the lateral ventricles and the subgranular zone in the hippocampal dentate gyrus(DG)are the two brain regions where neurogenesis occurs throughout life in the adult mammalian brain(Ming and Song,2011).Adult quiescent hippocampal neural stem cells(NSCs)are bona fide stem cells and,when activated,give rise to newborn granule neurons in the adult brain,which play vital roles in learning,memory,mood,and affective cognition(Bonaguidi et al.,2011;Ming and Song,2011).
基金supported by the Heilongjiang Province“Double First Class”Discipline Collaborative Innovation Project(LJGXCG2023-061)。
文摘Currently,zinc anodes are facing problems such as the growth of zinc dendrites and the frequent occurrence of side reactions,while existing additive strategies are still challenging due to the poor stability of the adsorption layer and the ambiguous mechanisms of action.In this study,a highly stable Vani molecular brush additive was designed.The additive effectively inhibits H_(2) generation by targeting and anchoring H+in the inner Helmholtz layer,and reduces the water activity by constructing an enhanced hydrogen bonding network through the interaction with water molecules,thus inhibiting the parasitic side reactions on the zinc anode.In addition,the dynamic interfacial molecular layer can regulate and buffer the interfacial Zn^(2+)for highly reversible plating/stripping.Experiments show that the symmetric cell cycle life is as long as 3760 h at a Vani content of only 2×10^(-3) g L^(-1) with a current density of5 mA cm^(-2).The cycle life of the Zn‖MnO_(2) and Zn‖Zn_(0.58)V_(2)O_(5) H_(2)O full battery is significantly improved.This study deepens the understanding of the working mechanism of the zinc electrode interface and provides new ideas for non-sacrififcial trace additive design.
基金supported by the National Natural Science Foundation of China(52222902 and 52079029)。
文摘Integrated water and fertilizer management is important for promoting sustainable development of facility agriculture,and biochar plays an important role in guaranteeing food production,as well as alleviating water shortages and the overuse of fertilizers.The field experiment had twelve treatments and a control(CK)trial including two irrigation amounts(I1,100%ETm;I2,60%ETm;where ETm is the maximum evapotranspiration),two nitrogen applications(N1,360 kg ha^(−1);N2,120 kg ha^(−1))and three biochar application levels(B1,60 t ha^(−1);B_(2),30 t ha^(−1)and B3,0 t ha^(−1)).A multi-objective synergistic irrigation-nitrogen-biochar application system for improving tomato yield,quality,water and nitrogen use efficiency,and greenhouse emissions was developed by integrating the techniques of experimentation and optimization.First,a coupled irrigation-nitrogen-biochar plot experiment was arranged.Then,tomato yield and fruit quality parameters were determined experimentally to establish the response relationships between irrigation-nitrogen-biochar dosage and yield,comprehensive quality of tomatoes(TCQ),irrigation water use efficiency(IWUE),partial factor productivity of nitrogen(PFPN),and net greenhouse gas emissions(NGE).Finally,a multi-objective dynamic optimization regulation model of irrigation-nitrogen-biochar resource allocation at different growth stages of tomato was constructed which was solved by the fuzzy programming method.The results showed that the application of irrigation and nitrogen to biochar promoted increase in yield,IWUE and PFPN,while it had an inhibitory effect on NGE.In addition,the optimal allocation amounts of water and fertilizer were different under different scenarios.The yield of the S1 scenario increased by 8.31%compared to the B_(1)I_(1)N_(2) treatment;TCQ of the S2 scenario increased by 5.14%compared to the B_(2)I_(2)N_(1) treatment;IWUE of the S3 scenario increased by 10.01%compared to the B1I2N2 treatment;PFPN of the S4 scenario increased by 9.35%compared to the B_(1)I_(1)N_(2) treatment;and NGE of the S5 scenario decreased by 11.23%compared to the B_(2)I1N1 treatment.The optimization model showed that the coordination of multiple objectives considering yield,TCQ,IWUE,PFPN,and NGE increased on average from 4.44 to 69.02%compared to each treatment when the irrigation-nitrogen-biochar dosage was 205.18 mm,186 kg ha^(−1)and 43.31 t ha^(−1),respectively.This study provides a guiding basis for the sustainable management of water and fertilizer in greenhouse tomato production under drip irrigation fertilization conditions.
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.51575528)the Science Foundation of China University of Petroleum,Beijing(No.2462022QEDX011).
文摘Pipeline isolation plugging robot (PIPR) is an important tool in pipeline maintenance operation. During the plugging process, the violent vibration will occur by the flow field, which can cause serious damage to the pipeline and PIPR. In this paper, we propose a dynamic regulating strategy to reduce the plugging-induced vibration by regulating the spoiler angle and plugging velocity. Firstly, the dynamic plugging simulation and experiment are performed to study the flow field changes during dynamic plugging. And the pressure difference is proposed to evaluate the degree of flow field vibration. Secondly, the mathematical models of pressure difference with plugging states and spoiler angles are established based on the extreme learning machine (ELM) optimized by improved sparrow search algorithm (ISSA). Finally, a modified Q-learning algorithm based on simulated annealing is applied to determine the optimal strategy for the spoiler angle and plugging velocity in real time. The results show that the proposed method can reduce the plugging-induced vibration by 19.9% and 32.7% on average, compared with single-regulating methods. This study can effectively ensure the stability of the plugging process.
基金This work was supported in part by the National Key Research and Development Program of China(2018YFA0702200)the National Natural Science Foundation of China(61933005,61833008)+6 种基金the Natural Science Foundation of Jiangsu Province of China(BK20220395)the Leading Technology Foundation Research Project of Jiangsu Province(BK20202011)the Natural Science Foundation of Jiangsu Universities(22KJB470024)Jiangsu Provincial Key Research and Development Program(BE2020001)Natural Science Foundation of Hebei Province of China(E2020203139)Natural Science Foundation of Nanjing University of Posts and Telecommunications(NY222032)the National Research Foundation of Korea(2020R1A2B5B02002002).
文摘Nowadays,the microgrid cluster is an important application scenario for energy trading.In trading,one of the most important research directions is the issue of pricing.To determine reasonable pricing for the microgrid cluster,data communication is used to create the cyber-physical system(CPS),which can improve the observability of microgrids.Then,the following works are carried out in the CPS.In the physical layer:1)Regarding trading between microgrids and the load,based on the generalized game theory,an optimal pricing strategy is proposed,which takes into account the interactive relationships among microgrids and transforms the pricing problem into a Nikaido-Isoda function to obtain the optimal prices conveniently;2)Regarding peer-to-peer trading between two microgrids,based on evolutionary game theory and the penalty mechanism,the optimal sale price of the seller is selected with boundary rationality.In the cyber layer,regarding the communication interruption issue existing in pricing(i.e.,the game process),based on the principle of matching the performance of the path with the importance degree of the data,a dynamic regulating method of paths is proposed,i.e.,adopting a new path to re-transmit the interrupted data to the destination.Finally,the effect of the proposed strategies is verified by case studies.
基金AJ-A is a Fonds de recherche du Québec-Santé(FRQS)scholarsupported by a grant from Natural Sciences and Engineering Research Council of Canada(NSERC RGPIN-2016-06605)
文摘Stem cells possess the ability to divide symmetrically or asymmet- rically to allow for maintenance of the stem cell pool or become committed progenitors and differentiate into various cell lineages. The unique self-renewal capabilities and pluripotency of stem cells are integral to tissue regeneration and repair （Oh et al., 2014）. Mul- tiple mechanisms including intracellular programs and extrinsic cues are reported to regulate neural stem cell （NSC） fate （Bond et al., 2015）. A recent study, published in Cell Stern Cell, identified a novel mechanism whereby mitochondrial dynamics drive NSC fate （Khacho et al., 2016）.
基金Project supported by the National Natural Science Foundation of China (Grant No. 12174041)China Postdoctoral Science Foundation (CPSF)(Grant No. 2022M723118)the seed grants from the Wenzhou Institute,University of Chinese Academy of Sciences (Grant No. WIUCASQD2021002)。
文摘How to control the dynamic behavior of large-scale artificial active matter is a critical concern in experimental research on soft matter, particularly regarding the emergence of collective behaviors and the formation of group patterns. Centralized systems excel in precise control over individual behavior within a group, ensuring high accuracy and controllability in task execution. Nevertheless, their sensitivity to group size may limit their adaptability to diverse tasks. In contrast, decentralized systems empower individuals with autonomous decision-making, enhancing adaptability and system robustness. Yet, this flexibility comes at the cost of reduced accuracy and efficiency in task execution. In this work, we present a unique method for regulating the centralized dynamic behavior of self-organizing clusters based on environmental interactions. Within this environment-coupled robot system, each robot possesses similar dynamic characteristics, and their internal programs are entirely identical. However, their behaviors can be guided by the centralized control of the environment, facilitating the accomplishment of diverse cluster tasks. This approach aims to balance the accuracy and flexibility of centralized control with the robustness and task adaptability of decentralized control. The proactive regulation of dynamic behavioral characteristics in active matter groups, demonstrated in this work through environmental interactions, holds the potential to introduce a novel technological approach and provide experimental references for studying the dynamic behavior control of large-scale artificial active matter systems.
基金The National Science and Technology Sup-port Project (No.2007BAA12B03)
文摘Control strategy affects directly the working performances of dynamic voltage regulator （DVR）. One-cycle control is an effective nonlinear signal modulation control method. In this paper, a new one-cycle control scheme for DVR was proposed in single phase supply system. On the basis of principle analysis, the corresponding one-cycle control model for DVR was built up, which is characterized by simple control circuits, good control performance, and high control precision. As an example, a control model for single-phase DVR was simulated by using Matlab/Simulink and SimPowerSystem. The results show that the load voltage could be compensated quickly at the points of supply voltage stepping down and up, and the relative error was less than 4% in the whole voltage sag process. Both theory analysis and simulation results show that the new one-cycle control scheme for DVR is effective.
基金financially supported by the Fundamental Research Program of Shanxi Province(No.202303021222126)the National Natural Science Foundation of China(No.92261103)。
文摘The dynamic regulation of single-molecule magnet(SMM)behavior remains challenging but extremely critical to practical applications.Efficient manipulation of magnetization of complexes via external stimulus,like solvent,pressure,electric potential or light may further extend the scope of applications for these magnetic molecules.Among these,light is highly desirable because it can provide high-contrast,sensitive and remote control of magnetic behavior at relatively high spatial and temporal resolution.Lanthanide(Ln)complexes represent a distinctive platform for constructing photo-responsive SMMs owing to their extreme sensitivity to subtle change of crystal field(CF)environment.Despite the numerous potential benefits and unique advantages outlined above,light control of magnetism of Ln-SMMs still faces several challenges.This review briefly summarizes recent advancements of photo-responsive Ln-SMMs with photochromic characteristic,highlighting the significance of photoinduced structural changes or electronic distribution alterations to modulate the magnetic properties,which may throw light on the future improvements of photo-responsive molecular materials.
基金supported by the National Natural Science Foundation of China(22105128)the Open Research Fund of the School of Chemistry and Chemical Engineering,Henan Normal University(2024Y12)。
文摘Chiral metal-organic frameworks(CMOFs),characterized by their enantioselective porous architectures,intrinsic chirality,and precisely ordered active sites,have emerged as a transformative class of materials with applications spanning asymmetric catalysis,enantiomeric separation,and chiral sensing.In this study,persulfurated arenes,as AIEgens with photoexcitation activity,were used as fluorescent dyes.Usingγ-cyclodextrin as a chiral template,we constructed a photo-responsive CMOF via intermolecular hydrogen bonding.The co-assembly process exhibited remarkable phenomena of chiral amplification and transfer,generating bright yellow fluorescence under mild UV irradiation at 365 nm.Deprotonated persulfurated arenes were used for comparative studies,and the resulting photoresponsive chiral metal-organic frameworks showed signals of reversed peaks at 400 and 460 nm.This study provides a novel construction strategy for chiral metal-organic frameworks featuring dual dynamic regulation mechanisms mediated by hydrogen bonding and photoirradiation.
基金supported by the Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education of the People’s Republic of China)the Basic Research Program of Shanxi Province-Free exploration category(No.20210302124460)for financial support.
文摘Radical-metal compounds used as functional materials can be applied to multiple fields such as solar-thermal conversion and ultra-high density data storage.However,the reactivity and instability of organic radicals usually hamper the development and application of radical-metal compounds.Herein,we utilized persistent nitronyl nitroxide to construct two categories of nitronyl nitroxide-Ln compounds,[Gd_(3)(hfac)_(9)(NIT4bpym)_(2)]_(2)·4CH_(2)Cl_(2)·C_(6)H_(14)(1-Gd),[Dy_(3)(hfac)_(9)(NIT4bpym)_(2)](1-Dy)and[Dy_(3)(hfac)_(9)(NITPzCH_(2)IM)_(2)]·2CH_(2)Cl_(2)(2-Dy)(NIT4bpym=2),2′-dipyridyl-4-(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl);NITPzCH_(2)IM=[2-(1-methylimidazole)methyl-1-pyrazol]-4-(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl)(hfac=hexafluoroacetylacetonate),involving a rare[4f-2p-4f-2p-4f]multi-spin motif with an electron donor-acceptor pattern.Notably,thanks to the rigidity modification of nitronyl nitroxide,prominent enhancement of photothermal conversion efficiency from 56.9% to 74.0% and the magnetic switching phenomenon have been observed with molecular structure transformation from flexibility(2-Dy)to stiffness(1-Dy),offering an avenue for the regulation of the photothermal effect and magnetic dynamics.
基金supported by the National Natural Science Foundation of China(21978070)Major Science and Technology Projects in Henan Province(251100110300)+3 种基金Key R&D Projects in Henan Province(251111113700)Tuoxin Talent Cultivation Program of Henan University of Technology(2025)State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology(CRE-25-C005)Program for the Top Young Talents of Henan Association for Science and Technology(2023).
文摘L-malic acid is widely used in biomedicine,food chemicals and other fields.The production process of L-malic acid by Escherichia coli suffers from the problems of unconcentrated carbon flow distribution and low CO_(2) fix-ation efficiency.In our previous research,the high-yielding L-malic acid chassis strain that could utilize the T7 expression system was constructed,with only partially blocked the malate consumption pathway.In this study,the transcriptome analysis to determine the direction of carbon flow allocation was performed firstly.To increase the carbon flux for the conversion of oxaloacetate to L-malic acid,the malate dehydrogenase was expressed in E.coli alone or in combination.A CO_(2) fixation branch was constructed by introducing the ribulose 5-phosphate kinase(PRK)and ribulose 1,5-bisphosphate kinase carboxylase/oxygenase(RuBisCO).Moreover,the dynamic regulatory system was designed that the pyruvate responded to dynamically repress genes on the metabolic pathway and concentrate carbon fluxes to balance in carbon flux distribution while maintaining the normal metabolism in the strain.The metabolic fluxes were directed to the L-malic acid synthesis pathway with the elucidation on the regulatory mechanism of carbon fluxes in this pathway.The engineered strain that dynamically regulated the pykF gene and introduced pET28a-mdh1+mdh2 and pETDuet-prk+RuBisco achieved a glucose consumption of 41.08 g/L,resulting in the highest L-malic acid titer of 23.00 g/L,with an increase of 202% from the starting strain.It demonstrates an effective strategy for the carbon flow allocation in the L-malic acid biosynthesis.
基金support from the National Natural Science Foundation of Jiangsu Province(Grant No.BK20240672)the China Postdoctoral Science Foundation(Grant No.2024M751423)+1 种基金the Postdoctoral Fellowship Program of CPSF(Grant No.GZC20240705)the Jiangsu Province Excellent Postdoctoral Pro-gram(Grant No.2024ZB065).
文摘(+)-Nootkatone,a valuable grapefruit-derived sesquiterpenoid,is targeted for microbial production to address its limited availability.In this study,we reported the highest de novo biosynthesis of(+)-nootkatone in Escherichia coli using stress-response systems for dynamic regulation to overcome challenges associated with metabolic promiscuity.Initial screening farnesyl diphosphate(FPP)synthase and cytochrome P450 led to a chassis strain producing 10.7 mg/L(+)-nootkatone.Implementing an FPP-responsive dynamic regulation system(PgadE and PrstA)increased the titer to 67.0 mg/L by preventing farnesol accumulation.The production was further increased to 128.9 mg/L through PrstA promoter engineering and baffle flasks.Fed-batch strategies ultimately achieved a final titer of 165.1 mg/L,a 15-fold improvement over static regulation.These results establish a platform for(+)-nootkatone biosynthesis in E.coli and highlight the importance of stress-response dynamic regulation for CYP450-mediated terpenoid production,offering a strong foundation for terpene derivative biosynthesis.
基金supported by the National Natural Science Foundation of China(U2106228,32300023)Jiangsu Province Excellent Postdoctoral Program(2024ZB238)+1 种基金the Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture(XTC2205)National Students’Platform for Innovation and Entrepreneurship Training Program(202410291071Z).
文摘D-allulose,a low-caloric sweetener,represents a promising alternative to sucrose across diverse applications.In contrast to enzymatic production,fermentation-based approaches coupled with metabolic engineering strategies present a more economically viable and operationally streamlined production route.Nevertheless,traditional regulatory tools,including gene deletion and isopropylβ-D-thiogalactoside(IPTG)-mediated induction,exhibit limitations in achieving precise temporal control over metabolic processes.Herein,two mutually orthogonal optogenetic systems were combined with clustered regularly interspaced short palindromic repeats interference(CRISPRi)technology to enable the spatiotemporal control of cellular behavior and dynamically reallocate metabolic resources.Specifically,the YF1/FixJ and iLight-ho1 systems were employed in the CRISPRi/dCpf1 system,with protein production triggered by blue light and dark conditions,respectively,to redirect metabolic pathways towards D-allulose production,enables precise balancing without the metabolic fragility caused by gene knockout.Consequently,D-allulose production achieved a titer of 5.924 g/L,indicating a 3.26-fold increase compared to the unregulated control,with a productivity of 0.197 g/L/h and an in vitro conversion yield(the intracellular D-allulose to residual D-fructose ratio)of 75.8%.These represented the highest titer,productivity and in vitro conversion yield of D-allulose from D-fructose by fermentation reported to date.The findings validate the dual-opto-CRISPRi system as an efficient metabolic engineering strategy for enhancing product yields,highlighting its potential for broader industrial applications.
基金supported by the National Natural Science Foundation of China(NSFC 21801226)the Natural Science Foundation of Zhejiang Province(LY20B010002 and LQ22B010002)athe Zhejiang Normal University Fund.
文摘The controlled synthesis and structure determination of two titanium-oxo(Ti-O)clusters(Ti_(10)Cu_(2))sp(sp:hard-sphere-like packing)and(Ti_(10)Cu_(2))cs(cs:chain stacking)are presented.In contrast to the previously reported assemblies of Ti-O clusters by organic or inorganic linkers,(Ti_(10)Cu_(2))sp and(Ti_(10)Cu_(2))cs are achieved via regulating the surface dynamics of Ti-O clusters and further stabilized by CH…πinteractions.The surface dynamics was regulated via a change of dynamically detached Sal-Cu/OMe-Cu motifs(Sal=salicylic acid).
基金This work was supported by National Key Research and Development Program of China(2018YFA0901800 and 2018YFA0901400)National Natural Science Foundation of China(21978015,21636001,and 21776008).
文摘Phenolic compounds(PCs)are a group of compounds with various applications in nutraceutical,pharmaceutical and cosmetic industries.Their supply by plant extraction and chemical synthesis is often limited by low yield and high cost.Microbial production represents as a promising alternative for efficient and sustainable production of PCs.In this review,we summarize recent advances in this field,which include enzyme mining and engineering to construct artificial pathways,balance of enzyme expression to improve pathway efficiency,coculture engineering to alleviate metabolic burden and side-reactions,and the use of genetic circuits for dynamic regulation and high throughput screening.Finally,current challenges and future perspectives for efficient production of PCs are also discussed.
基金financially supported by the National Key Research and Development Program of China(No.2021YFA0718900)the National Natural Science Foundation of China(No.62175248)+1 种基金Shanghai Science and Technology Funds(No.23ZR1481900)the Major science and technology project of Yunnan Province(No.202302AB080023).
文摘Camouflage technology has garnered increasing attention for various applications.With the continuous advancement of detection technologies and the increasing variability of camouflage scenarios,the demand for multispectral dynamic camouflage has been steadily growing.In this work,we present a multispectral dynamic regulator based on phase-changing material vanadium dioxide(VO_(2))that can be dynamically and functional-independently regulated for reflective color and thermal radiation.It has been shown that the device can achieve a wide color gamut variation in visible band while simultaneously achieving highest emissivity tunability(Δε=-0.58)in the atmospheric window up to now,achieves multispectral camouflage spanning the visible and infrared spectra among VO_(2)-based devices.To go a step further,we advance the device featuring long-term cycling stability to achieve thermal-electric dual-mode response and flexibility for a series real-world camouflage performance evaluation.We have also demonstrated the digital camouflage based on multispectral dynamic regulator through Neighboring Color Block Camouflage Algorithm,highlighting its potential for practical implementation in different camouflage scenarios.The device achieves multispectral dynamic camouflage,opening a path for advancing the technology development in both the scientific field and practical applications.
基金supported by the National Natural Science Foundation(grant number 22479016).
文摘Iontronics presents a transformative paradigm for energy and information processing via ions as active charge carriers.Here,triboiontronics is introduced,a novel strategy leveraging contact electrification to achieve dynamic regulation of electrical double layers.Inspired by signaling mechanisms of biological neural systems,triboiontronics enables enhanced ionic-electronic coupling without external power input,offering a material-independent and self-powered pathway for programmable interfacial behavior,underscoring its promise for post-Moore,energy-autonomous information technologies.
基金supported by the National Natural Science Foundation of China(IOS-2207677 and 32201723).
文摘Rice stands as the most significant crop in China,but it frequently encounters diseases that lead to an average yield loss of 10%to 30%[1].Over the past decade,the area affected by rice pests and diseases in China has ranged from 18 to 27 million hectares annually,leading to a loss of 1.3 to 2 million tons of rice[2].Identifying genes that confer broad and durable disease resistance,along with elucidating the molecular mechanisms underlying plant immune activation and broad-spectrum resistance regulation,constitutes the fundamental theoretical foundation for breeding disease-resistant crops.
基金supported by the National Natural Science Foundation of China(52025032)China Postdoctoral Science Foundation(2024M761946)+2 种基金Postdoctoral Fellowship Program of the China Postdoctoral Science Foundation(GZC20231544)National Natural Science Foundation of China(523B2026)Natural Science Foundation of Shanghai(24ZR1438600)。
文摘Asymmetric deformations in soft materials are ubiquitous in nature and play a crucial role in various biological and mechanical processes,yet current fabrication strategies primarily focus on introducing anisotropy while overlooking the internal transfer of stress,energy,or matter.In this work,we discovered a pattern mapping behavior driven by the selective distribution of photochemical crosslinking regions and the application of external stress fields,resulting in complementary mappable structures on the opposite side of the material.Theoretical simulations and experimental results reveal that the key to pattern mapping lies in the asymmetric deformation along the stretching direction of the material,coupled with the migration of polymer chains within the soft material.Employing complementary stress fields,2D ordered or 3D hierarchical patterns can be precisely mapped onto both sides.Moreover,upon thermal stimulation,the mapped patterns and macroscopic deformations demonstrate outstanding reversibility across multiple cycles.This result reveals mapping behaviors induced by asymmetric deformations and polymer chain migration within soft materials under external stress fields,offering valuable insights for designing structures with interactive functionalities.
